diff --git a/Info.plist b/Info.plist new file mode 100644 index 0000000..e28e021 --- /dev/null +++ b/Info.plist @@ -0,0 +1,298 @@ + + + + + BuildMachineOSBuild + 13A603 + CFBundleDevelopmentRegion + en + CFBundleDisplayName + {{project.title}} + CFBundleExecutable + {{project.title}} + CFBundleIconFiles + + Icon-167.png + Icon-60@3x.png + Icon-60@2x.png + Icon-76@2x.png + Icon-76.png + Icon@2x.png + Icon.png + Icon-72@2x.png + Icon-72.png + + CFBundleIcons + + CFBundlePrimaryIcon + + CFBundleIconFiles + + Icon-167.png + Icon-60@3x.png + Icon-60@2x.png + Icon-76@2x.png + Icon-76.png + Icon@2x.png + Icon.png + Icon-72@2x.png + Icon-72.png + + UIPrerenderedIcon + <{{ios.pre_renderered_icons}}/> + + + CFBundleIdentifier + {{ios.bundle_identifier}} + CFBundleInfoDictionaryVersion + 6.0 + CFBundleName + dmengine + CFBundlePackageType + APPL + CFBundleShortVersionString + {{project.version}} + CFBundleSignature + ???? + CFBundleSupportedPlatforms + + iPhoneOS + + CFBundleVersion + {{project.version}} + DTCompiler + com.apple.compilers.llvm.clang.1_0 + DTPlatformBuild + 11B508 + DTPlatformName + iphoneos + DTPlatformVersion + 7.0 + DTSDKBuild + 11B508 + DTSDKName + iphoneos7.0 + DTXcode + 0501 + DTXcodeBuild + 5A2053 + UIFileSharingEnabled + <{{project.write_log}}/> + LSRequiresIPhoneOS + + MinimumOSVersion + 6.0.0 + UIDeviceFamily + + 1 + 2 + + UIStatusBarHidden + + UIViewControllerBasedStatusBarAppearance + + UIRequiredDeviceCapabilities + + armv7 + opengles-2 + + UISupportedInterfaceOrientations + {{#orientation-support}} + UIInterfaceOrientation{{.}}{{/orientation-support}} + + UISupportedInterfaceOrientations~ipad + {{#orientation-support}} + UIInterfaceOrientation{{.}}{{/orientation-support}} + + + NSCameraUsageDescription + Scan for QR codes + + CFBundleURLTypes + + + CFBundleURLSchemes + + {{#url-schemes}}{{.}}{{/url-schemes}} + + + + + LSApplicationQueriesSchemes + + {{#application-queries-schemes}}{{.}}{{/application-queries-schemes}} + + + NSAppTransportSecurity + + NSExceptionDomains + + facebook.com + + NSIncludesSubdomains + + NSThirdPartyExceptionRequiresForwardSecrecy + + + fbcdn.net + + NSIncludesSubdomains + + NSThirdPartyExceptionRequiresForwardSecrecy + + + akamaihd.net + + NSIncludesSubdomains + + NSThirdPartyExceptionRequiresForwardSecrecy + + + + + + UILaunchImages + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default + UILaunchImageOrientation + Portrait + UILaunchImageSize + {320, 480} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default + UILaunchImageOrientation + Landscape + UILaunchImageSize + {320, 480} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-568h + UILaunchImageOrientation + Portrait + UILaunchImageSize + {320, 568} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-568h + UILaunchImageOrientation + Landscape + UILaunchImageSize + {320, 568} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-Portrait-667h + UILaunchImageOrientation + Portrait + UILaunchImageSize + {375, 667} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-Landscape-667h + UILaunchImageOrientation + Landscape + UILaunchImageSize + {375, 667} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-Portrait-736h + UILaunchImageOrientation + Portrait + UILaunchImageSize + {414, 736} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-Landscape-736h + UILaunchImageOrientation + Landscape + UILaunchImageSize + {414, 736} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-Portrait-1024h + UILaunchImageOrientation + Portrait + UILaunchImageSize + {768, 1024} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-Landscape-1024h + UILaunchImageOrientation + Landscape + UILaunchImageSize + {768, 1024} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-Portrait-1366h + UILaunchImageOrientation + Portrait + UILaunchImageSize + {1024,1366} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-Landscape-1366h + UILaunchImageOrientation + Landscape + UILaunchImageSize + {1024,1366} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-Portrait-812h + UILaunchImageOrientation + Portrait + UILaunchImageSize + {375, 812} + + + UILaunchImageMinimumOSVersion + 8.0 + UILaunchImageName + Default-Landscape-812h + UILaunchImageOrientation + Landscape + UILaunchImageSize + {375, 812} + + + + diff --git a/README.md b/README.md index cea3fb0..472329f 100644 --- a/README.md +++ b/README.md @@ -1,6 +1,44 @@ # QRCode -A simple extension to decode and encode QR codes +A small extension to encode and decode QR codes. +It relies on [buffers](https://www.defold.com/ref/buffer/). + +For the supported set of QRCodes to decode, see the documentation for [Quirc decoded](https://github.com/dlbeer/quirc) +The encoder supports the traditional QR code type. + +# Example app + +Push the Scan button to start scanning for qrcodes. The camera starts running and the the app scans the +camera image for the first qrcode. Similarly, push the QRCode button to create a qrcode: +
+ + + +# Lua api: + +## qrcode.scan(buffer, width, height, flip_x) -> string + +Scans an image buffer for any qrcode. + + `buffer` An image buffer where the first stream must be of format `UINT8` * 3, and have the dimensions width*height + + `width` The width of the image, in texels + + `height` The height of the image, in texels + + `flip_x` A boolean flag that tells the decoder to flip the image in X first. + + -> `string` Returns a the text from the qrcode if successful. Returns nil otherwise + +## qrcode.generate(text) -> buffer, size + +Generates a qrcode in the form of a buffer of format: name = 'data', type = `UINT8` * 1, and dimensions `size` * `size` + + `text` The text that needs decoding. The maximum text length is dependent on the [input data](http://www.qrcode.com/en/about/version.html). Kanji is currently not supported specifically, but will be treated as `bytes` + + -> `buffer` An image buffer of dimensions `size` * `size`. The stream name is `data` and the type+count is `UINT8` * 1 + + -> `size` The size of one side of the image # Credits: diff --git a/game.project b/game.project index 195a5d1..8170f29 100644 --- a/game.project +++ b/game.project @@ -21,4 +21,24 @@ scale = 0.02 shared_state = 1 [library] -include_dirs = qrcode \ No newline at end of file +include_dirs = qrcode + +[ios] +bundle_identifier = com.defold.qrcode +infoplist = /Info.plist +app_icon_57x57 = /icons/Icon-57.png +app_icon_72x72 = /icons/Icon-72.png +app_icon_76x76 = /icons/Icon-76.png +app_icon_114x114 = /icons/Icon-114.png +app_icon_120x120 = /icons/Icon-120.png +app_icon_144x144 = /icons/Icon-144.png +app_icon_152x152 = /icons/Icon-152.png +app_icon_167x167 = /icons/Icon-167.png +app_icon_180x180 = /icons/Icon-180.png + +[android] +package = com.defold.qrcode + +[osx] +bundle_identifier = com.defold.qrcode + diff --git a/icons/Icon-114.png b/icons/Icon-114.png new file mode 100644 index 0000000..a5f48cc Binary files /dev/null and b/icons/Icon-114.png differ diff --git a/icons/Icon-120.png b/icons/Icon-120.png new file mode 100644 index 0000000..a157011 Binary files /dev/null and b/icons/Icon-120.png differ diff --git a/icons/Icon-144.png b/icons/Icon-144.png new file mode 100644 index 0000000..2d0ff08 Binary files /dev/null and b/icons/Icon-144.png differ diff --git a/icons/Icon-152.png b/icons/Icon-152.png new file mode 100644 index 0000000..d19de25 Binary files /dev/null and b/icons/Icon-152.png differ diff --git a/icons/Icon-167.png b/icons/Icon-167.png new file mode 100644 index 0000000..02675df Binary files /dev/null and b/icons/Icon-167.png differ diff --git a/icons/Icon-180.png b/icons/Icon-180.png new file mode 100644 index 0000000..0edc285 Binary files /dev/null and b/icons/Icon-180.png differ diff --git a/icons/Icon-57.png b/icons/Icon-57.png new file mode 100644 index 0000000..a7d088f Binary files /dev/null and b/icons/Icon-57.png differ diff --git a/icons/Icon-72.png b/icons/Icon-72.png new file mode 100644 index 0000000..3cb65fe Binary files /dev/null and b/icons/Icon-72.png differ diff --git a/icons/Icon-76.png b/icons/Icon-76.png new file mode 100644 index 0000000..ac97e1a Binary files /dev/null and b/icons/Icon-76.png differ diff --git a/main/main.script b/main/main.script index a1986af..c511ec3 100644 --- a/main/main.script +++ b/main/main.script @@ -47,51 +47,12 @@ local function update_scan(self) if text ~= nil then msg.post("gui", "set_text", {text=text}) end_scan(self) + self.mode = "IDLE" return end end end -local function rescale_texture_old(src_buf, src_size, dst_buf, dst_size) - local src = buffer.get_stream(src_buf, hash("rgb")) - local dst = buffer.get_stream(dst_buf, hash("rgb")) - print("src", src_size, src_size, src_size*src_size*3) - print("dst", dst_size, dst_size, dst_size*dst_size*3) - for dy=0,dst_size-1 do - local v = dy / dst_size - for dx=0,dst_size-1 do - local u = dx / dst_size - local dst_index = (dy * dst_size + dx) * 3 + 1 - local src_index = (math.floor(v * src_size) * src_size + math.floor(u * src_size)) * 3 + 1 - print(dx, dy, dst_index, src_index) - dst[dst_index + 0] = src[src_index + 0] - dst[dst_index + 1] = src[src_index + 1] - dst[dst_index + 2] = src[src_index + 2] - end - end -end - - -local function rescale_texture(src_buf, src_size, dst_buf, dst_size) - local src = buffer.get_stream(src_buf, hash("rgb")) - local dst = buffer.get_stream(dst_buf, hash("rgb")) - print("src", src_size, src_size, src_size*src_size*3) - print("dst", dst_size, dst_size, dst_size*dst_size*3) - for dy=0,dst_size-1 do - local v = dy / dst_size - for dx=0,dst_size-1 do - local u = dx / dst_size - local dst_index = (dy * dst_size + dx) * 3 + 1 - local src_index = (math.floor(v * src_size) * src_size + math.floor(u * src_size)) * 3 + 1 - print(dx, dy, dst_index, src_index) - dst[dst_index + 0] = src[src_index + 0] - dst[dst_index + 1] = src[src_index + 1] - dst[dst_index + 2] = src[src_index + 2] - end - end -end - - local function generate_qrcode(self, text) local qrcode, qrsize = qrcode.generate(text) @@ -128,7 +89,6 @@ function final(self) end function update(self, dt) - if self.mode == "SCAN" then update_scan(self) end diff --git a/main/new_file.script b/main/new_file.script deleted file mode 100644 index 5be84c2..0000000 --- a/main/new_file.script +++ /dev/null @@ -1,29 +0,0 @@ -function init(self) - -- Add initialization code here - -- Remove this function if not needed -end - -function final(self) - -- Add finalization code here - -- Remove this function if not needed -end - -function update(self, dt) - -- Add update code here - -- Remove this function if not needed -end - -function on_message(self, message_id, message, sender) - -- Add message-handling code here - -- Remove this function if not needed -end - -function on_input(self, action_id, action) - -- Add input-handling code here - -- Remove this function if not needed -end - -function on_reload(self) - -- Add reload-handling code here - -- Remove this function if not needed -end diff --git a/qrcode/src/qrcode.cpp b/qrcode/src/qrcode.cpp index 1276488..41f945f 100644 --- a/qrcode/src/qrcode.cpp +++ b/qrcode/src/qrcode.cpp @@ -16,9 +16,6 @@ #define JC_QRENCODE_IMPLEMENTATION #include "jc_qrencode.h" -#define STB_IMAGE_WRITE_IMPLEMENTATION -#include "stb_image_write.h" - // GENERATE // https://github.com/nayuki/QR-Code-generator @@ -37,7 +34,7 @@ static int Scan(lua_State* L) dmScript::LuaHBuffer* buffer = dmScript::CheckBuffer(L, 1); int width = luaL_checkint(L, 2); int height = luaL_checkint(L, 3); - int flip = luaL_checkint(L, 4); + int flip_x = luaL_checkint(L, 4); struct quirc* qr; @@ -74,7 +71,7 @@ static int Scan(lua_State* L) value = 1.0f; } - if( flip == 0 ) + if( flip_x == 0 ) image[y * width + x] = (uint8_t)(value * 255.0f); else image[y * width + (width - x - 1)] = (uint8_t)(value * 255.0f); @@ -113,36 +110,6 @@ static int Scan(lua_State* L) return 1; } -static int save_image(JCQRCode* qr, const char* path) -{ - int32_t size = qr->size; - - int32_t border = 0; - int32_t scale = 1; - int32_t newsize = scale*(size + 2 * border); - uint8_t* large = (uint8_t*)malloc( newsize * newsize ); - - memset(large, 255, newsize*newsize); - - for( int y = 0; y < size*scale; ++y ) - { - for( int x = 0; x < size*scale; ++x ) - { - uint8_t module = qr->data[(y/scale)*256 + (x/scale)]; - large[(y + scale*border) * newsize + x + scale*border] = module; - } - } - - int result = stbi_write_png(path, newsize, newsize, 1, large, newsize); - free(large); - - if(result) - printf("Wrote to %s\n", path); - else - printf("Failed to write to %s\n", path); - return result; -} - static dmBuffer::HBuffer GenerateImage(JCQRCode* qr, uint32_t* outsize) { int32_t size = qr->size; @@ -171,7 +138,8 @@ static dmBuffer::HBuffer GenerateImage(JCQRCode* qr, uint32_t* outsize) { for( int x = 0; x < size*scale; ++x ) { - uint8_t module = qr->data[(y/scale)*256 + (x/scale)]; + int flip_y = size*scale - y - 1; // flip it so we can easily pass it as a texture later on + uint8_t module = qr->data[(flip_y/scale)*256 + (x/scale)]; data[(y + scale*border) * newsize + x + scale*border] = module; } } diff --git a/qrcode/src/stb_image.h b/qrcode/src/stb_image.h deleted file mode 100644 index c0857db..0000000 --- a/qrcode/src/stb_image.h +++ /dev/null @@ -1,7102 +0,0 @@ -/* stb_image - v2.14 - public domain image loader - http://nothings.org/stb_image.h - no warranty implied; use at your own risk - - Do this: - #define STB_IMAGE_IMPLEMENTATION - before you include this file in *one* C or C++ file to create the implementation. - - // i.e. it should look like this: - #include ... - #include ... - #include ... - #define STB_IMAGE_IMPLEMENTATION - #include "stb_image.h" - - You can #define STBI_ASSERT(x) before the #include to avoid using assert.h. - And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free - - - QUICK NOTES: - Primarily of interest to game developers and other people who can - avoid problematic images and only need the trivial interface - - JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib) - PNG 1/2/4/8-bit-per-channel (16 bpc not supported) - - TGA (not sure what subset, if a subset) - BMP non-1bpp, non-RLE - PSD (composited view only, no extra channels, 8/16 bit-per-channel) - - GIF (*comp always reports as 4-channel) - HDR (radiance rgbE format) - PIC (Softimage PIC) - PNM (PPM and PGM binary only) - - Animated GIF still needs a proper API, but here's one way to do it: - http://gist.github.com/urraka/685d9a6340b26b830d49 - - - decode from memory or through FILE (define STBI_NO_STDIO to remove code) - - decode from arbitrary I/O callbacks - - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON) - - Full documentation under "DOCUMENTATION" below. - - - Revision 2.00 release notes: - - - Progressive JPEG is now supported. - - - PPM and PGM binary formats are now supported, thanks to Ken Miller. - - - x86 platforms now make use of SSE2 SIMD instructions for - JPEG decoding, and ARM platforms can use NEON SIMD if requested. - This work was done by Fabian "ryg" Giesen. SSE2 is used by - default, but NEON must be enabled explicitly; see docs. - - With other JPEG optimizations included in this version, we see - 2x speedup on a JPEG on an x86 machine, and a 1.5x speedup - on a JPEG on an ARM machine, relative to previous versions of this - library. The same results will not obtain for all JPGs and for all - x86/ARM machines. (Note that progressive JPEGs are significantly - slower to decode than regular JPEGs.) This doesn't mean that this - is the fastest JPEG decoder in the land; rather, it brings it - closer to parity with standard libraries. If you want the fastest - decode, look elsewhere. (See "Philosophy" section of docs below.) - - See final bullet items below for more info on SIMD. - - - Added STBI_MALLOC, STBI_REALLOC, and STBI_FREE macros for replacing - the memory allocator. Unlike other STBI libraries, these macros don't - support a context parameter, so if you need to pass a context in to - the allocator, you'll have to store it in a global or a thread-local - variable. - - - Split existing STBI_NO_HDR flag into two flags, STBI_NO_HDR and - STBI_NO_LINEAR. - STBI_NO_HDR: suppress implementation of .hdr reader format - STBI_NO_LINEAR: suppress high-dynamic-range light-linear float API - - - You can suppress implementation of any of the decoders to reduce - your code footprint by #defining one or more of the following - symbols before creating the implementation. - - STBI_NO_JPEG - STBI_NO_PNG - STBI_NO_BMP - STBI_NO_PSD - STBI_NO_TGA - STBI_NO_GIF - STBI_NO_HDR - STBI_NO_PIC - STBI_NO_PNM (.ppm and .pgm) - - - You can request *only* certain decoders and suppress all other ones - (this will be more forward-compatible, as addition of new decoders - doesn't require you to disable them explicitly): - - STBI_ONLY_JPEG - STBI_ONLY_PNG - STBI_ONLY_BMP - STBI_ONLY_PSD - STBI_ONLY_TGA - STBI_ONLY_GIF - STBI_ONLY_HDR - STBI_ONLY_PIC - STBI_ONLY_PNM (.ppm and .pgm) - - Note that you can define multiples of these, and you will get all - of them ("only x" and "only y" is interpreted to mean "only x&y"). - - - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still - want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB - - - Compilation of all SIMD code can be suppressed with - #define STBI_NO_SIMD - It should not be necessary to disable SIMD unless you have issues - compiling (e.g. using an x86 compiler which doesn't support SSE - intrinsics or that doesn't support the method used to detect - SSE2 support at run-time), and even those can be reported as - bugs so I can refine the built-in compile-time checking to be - smarter. - - - The old STBI_SIMD system which allowed installing a user-defined - IDCT etc. has been removed. If you need this, don't upgrade. My - assumption is that almost nobody was doing this, and those who - were will find the built-in SIMD more satisfactory anyway. - - - RGB values computed for JPEG images are slightly different from - previous versions of stb_image. (This is due to using less - integer precision in SIMD.) The C code has been adjusted so - that the same RGB values will be computed regardless of whether - SIMD support is available, so your app should always produce - consistent results. But these results are slightly different from - previous versions. (Specifically, about 3% of available YCbCr values - will compute different RGB results from pre-1.49 versions by +-1; - most of the deviating values are one smaller in the G channel.) - - - If you must produce consistent results with previous versions of - stb_image, #define STBI_JPEG_OLD and you will get the same results - you used to; however, you will not get the SIMD speedups for - the YCbCr-to-RGB conversion step (although you should still see - significant JPEG speedup from the other changes). - - Please note that STBI_JPEG_OLD is a temporary feature; it will be - removed in future versions of the library. It is only intended for - near-term back-compatibility use. - - - Latest revision history: - 2.13 (2016-12-04) experimental 16-bit API, only for PNG so far; fixes - 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes - 2.11 (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64 - RGB-format JPEG; remove white matting in PSD; - allocate large structures on the stack; - correct channel count for PNG & BMP - 2.10 (2016-01-22) avoid warning introduced in 2.09 - 2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED - 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA - 2.07 (2015-09-13) partial animated GIF support - limited 16-bit PSD support - minor bugs, code cleanup, and compiler warnings - - See end of file for full revision history. - - - ============================ Contributors ========================= - - Image formats Extensions, features - Sean Barrett (jpeg, png, bmp) Jetro Lauha (Xstbi_info) - Nicolas Schulz (hdr, psd) Martin "SpartanJ" Golini (Xstbi_info) - Jonathan Dummer (tga) James "moose2000" Brown (iPhone PNG) - Jean-Marc Lienher (gif) Ben "Disch" Wenger (io callbacks) - Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG) - Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip) - Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD) - github:urraka (animated gif) Junggon Kim (PNM comments) - Daniel Gibson (16-bit TGA) - socks-the-fox (16-bit TGA) - Optimizations & bugfixes - Fabian "ryg" Giesen - Arseny Kapoulkine - - Bug & warning fixes - Marc LeBlanc David Woo Guillaume George Martins Mozeiko - Christpher Lloyd Martin Golini Jerry Jansson Joseph Thomson - Dave Moore Roy Eltham Hayaki Saito Phil Jordan - Won Chun Luke Graham Johan Duparc Nathan Reed - the Horde3D community Thomas Ruf Ronny Chevalier Nick Verigakis - Janez Zemva John Bartholomew Michal Cichon github:svdijk - Jonathan Blow Ken Hamada Tero Hanninen Baldur Karlsson - Laurent Gomila Cort Stratton Sergio Gonzalez github:romigrou - Aruelien Pocheville Thibault Reuille Cass Everitt Matthew Gregan - Ryamond Barbiero Paul Du Bois Engin Manap github:snagar - Michaelangel007@github Oriol Ferrer Mesia Dale Weiler github:Zelex - Philipp Wiesemann Josh Tobin github:rlyeh github:grim210@github - Blazej Dariusz Roszkowski github:sammyhw - - -LICENSE - -This software is dual-licensed to the public domain and under the following -license: you are granted a perpetual, irrevocable license to copy, modify, -publish, and distribute this file as you see fit. - -*/ - -#ifndef STBI_INCLUDE_STB_IMAGE_H -#define STBI_INCLUDE_STB_IMAGE_H - -// DOCUMENTATION -// -// Limitations: -// - no 16-bit-per-channel PNG -// - no 12-bit-per-channel JPEG -// - no JPEGs with arithmetic coding -// - no 1-bit BMP -// - GIF always returns *comp=4 -// -// Basic usage (see HDR discussion below for HDR usage): -// int x,y,n; -// unsigned char *data = Xstbi_load(filename, &x, &y, &n, 0); -// // ... process data if not NULL ... -// // ... x = width, y = height, n = # 8-bit components per pixel ... -// // ... replace '0' with '1'..'4' to force that many components per pixel -// // ... but 'n' will always be the number that it would have been if you said 0 -// Xstbi_image_free(data) -// -// Standard parameters: -// int *x -- outputs image width in pixels -// int *y -- outputs image height in pixels -// int *channels_in_file -- outputs # of image components in image file -// int desired_channels -- if non-zero, # of image components requested in result -// -// The return value from an image loader is an 'unsigned char *' which points -// to the pixel data, or NULL on an allocation failure or if the image is -// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels, -// with each pixel consisting of N interleaved 8-bit components; the first -// pixel pointed to is top-left-most in the image. There is no padding between -// image scanlines or between pixels, regardless of format. The number of -// components N is 'req_comp' if req_comp is non-zero, or *comp otherwise. -// If req_comp is non-zero, *comp has the number of components that _would_ -// have been output otherwise. E.g. if you set req_comp to 4, you will always -// get RGBA output, but you can check *comp to see if it's trivially opaque -// because e.g. there were only 3 channels in the source image. -// -// An output image with N components has the following components interleaved -// in this order in each pixel: -// -// N=#comp components -// 1 grey -// 2 grey, alpha -// 3 red, green, blue -// 4 red, green, blue, alpha -// -// If image loading fails for any reason, the return value will be NULL, -// and *x, *y, *comp will be unchanged. The function Xstbi_failure_reason() -// can be queried for an extremely brief, end-user unfriendly explanation -// of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid -// compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly -// more user-friendly ones. -// -// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized. -// -// =========================================================================== -// -// Philosophy -// -// stb libraries are designed with the following priorities: -// -// 1. easy to use -// 2. easy to maintain -// 3. good performance -// -// Sometimes I let "good performance" creep up in priority over "easy to maintain", -// and for best performance I may provide less-easy-to-use APIs that give higher -// performance, in addition to the easy to use ones. Nevertheless, it's important -// to keep in mind that from the standpoint of you, a client of this library, -// all you care about is #1 and #3, and stb libraries do not emphasize #3 above all. -// -// Some secondary priorities arise directly from the first two, some of which -// make more explicit reasons why performance can't be emphasized. -// -// - Portable ("ease of use") -// - Small footprint ("easy to maintain") -// - No dependencies ("ease of use") -// -// =========================================================================== -// -// I/O callbacks -// -// I/O callbacks allow you to read from arbitrary sources, like packaged -// files or some other source. Data read from callbacks are processed -// through a small internal buffer (currently 128 bytes) to try to reduce -// overhead. -// -// The three functions you must define are "read" (reads some bytes of data), -// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end). -// -// =========================================================================== -// -// SIMD support -// -// The JPEG decoder will try to automatically use SIMD kernels on x86 when -// supported by the compiler. For ARM Neon support, you must explicitly -// request it. -// -// (The old do-it-yourself SIMD API is no longer supported in the current -// code.) -// -// On x86, SSE2 will automatically be used when available based on a run-time -// test; if not, the generic C versions are used as a fall-back. On ARM targets, -// the typical path is to have separate builds for NEON and non-NEON devices -// (at least this is true for iOS and Android). Therefore, the NEON support is -// toggled by a build flag: define STBI_NEON to get NEON loops. -// -// The output of the JPEG decoder is slightly different from versions where -// SIMD support was introduced (that is, for versions before 1.49). The -// difference is only +-1 in the 8-bit RGB channels, and only on a small -// fraction of pixels. You can force the pre-1.49 behavior by defining -// STBI_JPEG_OLD, but this will disable some of the SIMD decoding path -// and hence cost some performance. -// -// If for some reason you do not want to use any of SIMD code, or if -// you have issues compiling it, you can disable it entirely by -// defining STBI_NO_SIMD. -// -// =========================================================================== -// -// HDR image support (disable by defining STBI_NO_HDR) -// -// stb_image now supports loading HDR images in general, and currently -// the Radiance .HDR file format, although the support is provided -// generically. You can still load any file through the existing interface; -// if you attempt to load an HDR file, it will be automatically remapped to -// LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1; -// both of these constants can be reconfigured through this interface: -// -// Xstbi_hdr_to_ldr_gamma(2.2f); -// Xstbi_hdr_to_ldr_scale(1.0f); -// -// (note, do not use _inverse_ constants; Xstbi_image will invert them -// appropriately). -// -// Additionally, there is a new, parallel interface for loading files as -// (linear) floats to preserve the full dynamic range: -// -// float *data = Xstbi_loadf(filename, &x, &y, &n, 0); -// -// If you load LDR images through this interface, those images will -// be promoted to floating point values, run through the inverse of -// constants corresponding to the above: -// -// Xstbi_ldr_to_hdr_scale(1.0f); -// Xstbi_ldr_to_hdr_gamma(2.2f); -// -// Finally, given a filename (or an open file or memory block--see header -// file for details) containing image data, you can query for the "most -// appropriate" interface to use (that is, whether the image is HDR or -// not), using: -// -// Xstbi_is_hdr(char *filename); -// -// =========================================================================== -// -// iPhone PNG support: -// -// By default we convert iphone-formatted PNGs back to RGB, even though -// they are internally encoded differently. You can disable this conversion -// by by calling Xstbi_convert_iphone_png_to_rgb(0), in which case -// you will always just get the native iphone "format" through (which -// is BGR stored in RGB). -// -// Call Xstbi_set_unpremultiply_on_load(1) as well to force a divide per -// pixel to remove any premultiplied alpha *only* if the image file explicitly -// says there's premultiplied data (currently only happens in iPhone images, -// and only if iPhone convert-to-rgb processing is on). -// - - -#ifndef STBI_NO_STDIO -#include -#endif // STBI_NO_STDIO - -#define STBI_VERSION 1 - -enum -{ - STBI_default = 0, // only used for req_comp - - STBI_grey = 1, - STBI_grey_alpha = 2, - STBI_rgb = 3, - STBI_rgb_alpha = 4 -}; - -typedef unsigned char Xstbi_uc; -typedef unsigned short Xstbi_us; - -#ifdef __cplusplus -extern "C" { -#endif - -#ifdef STB_IMAGE_STATIC -#define STBIDEF static -#else -#define STBIDEF extern -#endif - -////////////////////////////////////////////////////////////////////////////// -// -// PRIMARY API - works on images of any type -// - -// -// load image by filename, open file, or memory buffer -// - -typedef struct -{ - int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read - void (*skip) (void *user,int n); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative - int (*eof) (void *user); // returns nonzero if we are at end of file/data -} Xstbi_io_callbacks; - -//////////////////////////////////// -// -// 8-bits-per-channel interface -// - -STBIDEF Xstbi_uc *Xstbi_load (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); -STBIDEF Xstbi_uc *Xstbi_load_from_memory (Xstbi_uc const *buffer, int len , int *x, int *y, int *channels_in_file, int desired_channels); -STBIDEF Xstbi_uc *Xstbi_load_from_callbacks(Xstbi_io_callbacks const *clbk , void *user, int *x, int *y, int *channels_in_file, int desired_channels); - -#ifndef STBI_NO_STDIO -STBIDEF Xstbi_uc *Xstbi_load_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); -// for Xstbi_load_from_file, file pointer is left pointing immediately after image -#endif - -//////////////////////////////////// -// -// 16-bits-per-channel interface -// - -STBIDEF Xstbi_us *Xstbi_load_16(char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); -#ifndef STBI_NO_STDIO -STBIDEF Xstbi_us *Xstbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); -#endif -// @TODO the other variants - -//////////////////////////////////// -// -// float-per-channel interface -// -#ifndef STBI_NO_LINEAR - STBIDEF float *Xstbi_loadf (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); - STBIDEF float *Xstbi_loadf_from_memory (Xstbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels); - STBIDEF float *Xstbi_loadf_from_callbacks (Xstbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels); - - #ifndef STBI_NO_STDIO - STBIDEF float *Xstbi_loadf_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); - #endif -#endif - -#ifndef STBI_NO_HDR - STBIDEF void Xstbi_hdr_to_ldr_gamma(float gamma); - STBIDEF void Xstbi_hdr_to_ldr_scale(float scale); -#endif // STBI_NO_HDR - -#ifndef STBI_NO_LINEAR - STBIDEF void Xstbi_ldr_to_hdr_gamma(float gamma); - STBIDEF void Xstbi_ldr_to_hdr_scale(float scale); -#endif // STBI_NO_LINEAR - -// Xstbi_is_hdr is always defined, but always returns false if STBI_NO_HDR -STBIDEF int Xstbi_is_hdr_from_callbacks(Xstbi_io_callbacks const *clbk, void *user); -STBIDEF int Xstbi_is_hdr_from_memory(Xstbi_uc const *buffer, int len); -#ifndef STBI_NO_STDIO -STBIDEF int Xstbi_is_hdr (char const *filename); -STBIDEF int Xstbi_is_hdr_from_file(FILE *f); -#endif // STBI_NO_STDIO - - -// get a VERY brief reason for failure -// NOT THREADSAFE -STBIDEF const char *Xstbi_failure_reason (void); - -// free the loaded image -- this is just free() -STBIDEF void Xstbi_image_free (void *retval_from_Xstbi_load); - -// get image dimensions & components without fully decoding -STBIDEF int Xstbi_info_from_memory(Xstbi_uc const *buffer, int len, int *x, int *y, int *comp); -STBIDEF int Xstbi_info_from_callbacks(Xstbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp); - -#ifndef STBI_NO_STDIO -STBIDEF int Xstbi_info (char const *filename, int *x, int *y, int *comp); -STBIDEF int Xstbi_info_from_file (FILE *f, int *x, int *y, int *comp); - -#endif - - - -// for image formats that explicitly notate that they have premultiplied alpha, -// we just return the colors as stored in the file. set this flag to force -// unpremultiplication. results are undefined if the unpremultiply overflow. -STBIDEF void Xstbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply); - -// indicate whether we should process iphone images back to canonical format, -// or just pass them through "as-is" -STBIDEF void Xstbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert); - -// flip the image vertically, so the first pixel in the output array is the bottom left -STBIDEF void Xstbi_set_flip_vertically_on_load(int flag_true_if_should_flip); - -// ZLIB client - used by PNG, available for other purposes - -STBIDEF char *Xstbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen); -STBIDEF char *Xstbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header); -STBIDEF char *Xstbi_zlib_decode_malloc(const char *buffer, int len, int *outlen); -STBIDEF int Xstbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); - -STBIDEF char *Xstbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen); -STBIDEF int Xstbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); - - -#ifdef __cplusplus -} -#endif - -// -// -//// end header file ///////////////////////////////////////////////////// -#endif // STBI_INCLUDE_STB_IMAGE_H - -#ifdef STB_IMAGE_IMPLEMENTATION - -#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \ - || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \ - || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \ - || defined(STBI_ONLY_ZLIB) - #ifndef STBI_ONLY_JPEG - #define STBI_NO_JPEG - #endif - #ifndef STBI_ONLY_PNG - #define STBI_NO_PNG - #endif - #ifndef STBI_ONLY_BMP - #define STBI_NO_BMP - #endif - #ifndef STBI_ONLY_PSD - #define STBI_NO_PSD - #endif - #ifndef STBI_ONLY_TGA - #define STBI_NO_TGA - #endif - #ifndef STBI_ONLY_GIF - #define STBI_NO_GIF - #endif - #ifndef STBI_ONLY_HDR - #define STBI_NO_HDR - #endif - #ifndef STBI_ONLY_PIC - #define STBI_NO_PIC - #endif - #ifndef STBI_ONLY_PNM - #define STBI_NO_PNM - #endif -#endif - -#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB) -#define STBI_NO_ZLIB -#endif - - -#include -#include // ptrdiff_t on osx -#include -#include -#include - -#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) -#include // ldexp -#endif - -#ifndef STBI_NO_STDIO -#include -#endif - -#ifndef STBI_ASSERT -#include -#define STBI_ASSERT(x) assert(x) -#endif - - -#ifndef _MSC_VER - #ifdef __cplusplus - #define Xstbi_inline inline - #else - #define Xstbi_inline - #endif -#else - #define Xstbi_inline __forceinline -#endif - - -#ifdef _MSC_VER -typedef unsigned short Xstbi__uint16; -typedef signed short Xstbi__int16; -typedef unsigned int Xstbi__uint32; -typedef signed int Xstbi__int32; -#else -#include -typedef uint16_t Xstbi__uint16; -typedef int16_t Xstbi__int16; -typedef uint32_t Xstbi__uint32; -typedef int32_t Xstbi__int32; -#endif - -// should produce compiler error if size is wrong -typedef unsigned char validate_uint32[sizeof(Xstbi__uint32)==4 ? 1 : -1]; - -#ifdef _MSC_VER -#define STBI_NOTUSED(v) (void)(v) -#else -#define STBI_NOTUSED(v) (void)sizeof(v) -#endif - -#ifdef _MSC_VER -#define STBI_HAS_LROTL -#endif - -#ifdef STBI_HAS_LROTL - #define Xstbi_lrot(x,y) _lrotl(x,y) -#else - #define Xstbi_lrot(x,y) (((x) << (y)) | ((x) >> (32 - (y)))) -#endif - -#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED)) -// ok -#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED) -// ok -#else -#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)." -#endif - -#ifndef STBI_MALLOC -#define STBI_MALLOC(sz) malloc(sz) -#define STBI_REALLOC(p,newsz) realloc(p,newsz) -#define STBI_FREE(p) free(p) -#endif - -#ifndef STBI_REALLOC_SIZED -#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz) -#endif - -// x86/x64 detection -#if defined(__x86_64__) || defined(_M_X64) -#define STBI__X64_TARGET -#elif defined(__i386) || defined(_M_IX86) -#define STBI__X86_TARGET -#endif - -#if defined(__GNUC__) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) && !defined(__SSE2__) && !defined(STBI_NO_SIMD) -// NOTE: not clear do we actually need this for the 64-bit path? -// gcc doesn't support sse2 intrinsics unless you compile with -msse2, -// (but compiling with -msse2 allows the compiler to use SSE2 everywhere; -// this is just broken and gcc are jerks for not fixing it properly -// http://www.virtualdub.org/blog/pivot/entry.php?id=363 ) -#define STBI_NO_SIMD -#endif - -#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD) -// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET -// -// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the -// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant. -// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not -// simultaneously enabling "-mstackrealign". -// -// See https://github.com/nothings/stb/issues/81 for more information. -// -// So default to no SSE2 on 32-bit MinGW. If you've read this far and added -// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2. -#define STBI_NO_SIMD -#endif - -#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) -#define STBI_SSE2 -#include - -#ifdef _MSC_VER - -#if _MSC_VER >= 1400 // not VC6 -#include // __cpuid -static int Xstbi__cpuid3(void) -{ - int info[4]; - __cpuid(info,1); - return info[3]; -} -#else -static int Xstbi__cpuid3(void) -{ - int res; - __asm { - mov eax,1 - cpuid - mov res,edx - } - return res; -} -#endif - -#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name - -static int Xstbi__sse2_available() -{ - int info3 = Xstbi__cpuid3(); - return ((info3 >> 26) & 1) != 0; -} -#else // assume GCC-style if not VC++ -#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) - -static int Xstbi__sse2_available() -{ -#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 // GCC 4.8 or later - // GCC 4.8+ has a nice way to do this - return __builtin_cpu_supports("sse2"); -#else - // portable way to do this, preferably without using GCC inline ASM? - // just bail for now. - return 0; -#endif -} -#endif -#endif - -// ARM NEON -#if defined(STBI_NO_SIMD) && defined(STBI_NEON) -#undef STBI_NEON -#endif - -#ifdef STBI_NEON -#include -// assume GCC or Clang on ARM targets -#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) -#endif - -#ifndef STBI_SIMD_ALIGN -#define STBI_SIMD_ALIGN(type, name) type name -#endif - -/////////////////////////////////////////////// -// -// Xstbi__context struct and start_xxx functions - -// Xstbi__context structure is our basic context used by all images, so it -// contains all the IO context, plus some basic image information -typedef struct -{ - Xstbi__uint32 img_x, img_y; - int img_n, img_out_n; - - Xstbi_io_callbacks io; - void *io_user_data; - - int read_from_callbacks; - int buflen; - Xstbi_uc buffer_start[128]; - - Xstbi_uc *img_buffer, *img_buffer_end; - Xstbi_uc *img_buffer_original, *img_buffer_original_end; -} Xstbi__context; - - -static void Xstbi__refill_buffer(Xstbi__context *s); - -// initialize a memory-decode context -static void Xstbi__start_mem(Xstbi__context *s, Xstbi_uc const *buffer, int len) -{ - s->io.read = NULL; - s->read_from_callbacks = 0; - s->img_buffer = s->img_buffer_original = (Xstbi_uc *) buffer; - s->img_buffer_end = s->img_buffer_original_end = (Xstbi_uc *) buffer+len; -} - -// initialize a callback-based context -static void Xstbi__start_callbacks(Xstbi__context *s, Xstbi_io_callbacks *c, void *user) -{ - s->io = *c; - s->io_user_data = user; - s->buflen = sizeof(s->buffer_start); - s->read_from_callbacks = 1; - s->img_buffer_original = s->buffer_start; - Xstbi__refill_buffer(s); - s->img_buffer_original_end = s->img_buffer_end; -} - -#ifndef STBI_NO_STDIO - -static int Xstbi__stdio_read(void *user, char *data, int size) -{ - return (int) fread(data,1,size,(FILE*) user); -} - -static void Xstbi__stdio_skip(void *user, int n) -{ - fseek((FILE*) user, n, SEEK_CUR); -} - -static int Xstbi__stdio_eof(void *user) -{ - return feof((FILE*) user); -} - -static Xstbi_io_callbacks Xstbi__stdio_callbacks = -{ - Xstbi__stdio_read, - Xstbi__stdio_skip, - Xstbi__stdio_eof, -}; - -static void Xstbi__start_file(Xstbi__context *s, FILE *f) -{ - Xstbi__start_callbacks(s, &Xstbi__stdio_callbacks, (void *) f); -} - -//static void stop_file(Xstbi__context *s) { } - -#endif // !STBI_NO_STDIO - -static void Xstbi__rewind(Xstbi__context *s) -{ - // conceptually rewind SHOULD rewind to the beginning of the stream, - // but we just rewind to the beginning of the initial buffer, because - // we only use it after doing 'test', which only ever looks at at most 92 bytes - s->img_buffer = s->img_buffer_original; - s->img_buffer_end = s->img_buffer_original_end; -} - -enum -{ - STBI_ORDER_RGB, - STBI_ORDER_BGR -}; - -typedef struct -{ - int bits_per_channel; - int num_channels; - int channel_order; -} Xstbi__result_info; - -#ifndef STBI_NO_JPEG -static int Xstbi__jpeg_test(Xstbi__context *s); -static void *Xstbi__jpeg_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri); -static int Xstbi__jpeg_info(Xstbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_PNG -static int Xstbi__png_test(Xstbi__context *s); -static void *Xstbi__png_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri); -static int Xstbi__png_info(Xstbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_BMP -static int Xstbi__bmp_test(Xstbi__context *s); -static void *Xstbi__bmp_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri); -static int Xstbi__bmp_info(Xstbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_TGA -static int Xstbi__tga_test(Xstbi__context *s); -static void *Xstbi__tga_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri); -static int Xstbi__tga_info(Xstbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_PSD -static int Xstbi__psd_test(Xstbi__context *s); -static void *Xstbi__psd_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri, int bpc); -static int Xstbi__psd_info(Xstbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_HDR -static int Xstbi__hdr_test(Xstbi__context *s); -static float *Xstbi__hdr_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri); -static int Xstbi__hdr_info(Xstbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_PIC -static int Xstbi__pic_test(Xstbi__context *s); -static void *Xstbi__pic_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri); -static int Xstbi__pic_info(Xstbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_GIF -static int Xstbi__gif_test(Xstbi__context *s); -static void *Xstbi__gif_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri); -static int Xstbi__gif_info(Xstbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_PNM -static int Xstbi__pnm_test(Xstbi__context *s); -static void *Xstbi__pnm_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri); -static int Xstbi__pnm_info(Xstbi__context *s, int *x, int *y, int *comp); -#endif - -// this is not threadsafe -static const char *Xstbi__g_failure_reason; - -STBIDEF const char *Xstbi_failure_reason(void) -{ - return Xstbi__g_failure_reason; -} - -static int Xstbi__err(const char *str) -{ - Xstbi__g_failure_reason = str; - return 0; -} - -static void *Xstbi__malloc(size_t size) -{ - return STBI_MALLOC(size); -} - -// stb_image uses ints pervasively, including for offset calculations. -// therefore the largest decoded image size we can support with the -// current code, even on 64-bit targets, is INT_MAX. this is not a -// significant limitation for the intended use case. -// -// we do, however, need to make sure our size calculations don't -// overflow. hence a few helper functions for size calculations that -// multiply integers together, making sure that they're non-negative -// and no overflow occurs. - -// return 1 if the sum is valid, 0 on overflow. -// negative terms are considered invalid. -static int Xstbi__addsizes_valid(int a, int b) -{ - if (b < 0) return 0; - // now 0 <= b <= INT_MAX, hence also - // 0 <= INT_MAX - b <= INTMAX. - // And "a + b <= INT_MAX" (which might overflow) is the - // same as a <= INT_MAX - b (no overflow) - return a <= INT_MAX - b; -} - -// returns 1 if the product is valid, 0 on overflow. -// negative factors are considered invalid. -static int Xstbi__mul2sizes_valid(int a, int b) -{ - if (a < 0 || b < 0) return 0; - if (b == 0) return 1; // mul-by-0 is always safe - // portable way to check for no overflows in a*b - return a <= INT_MAX/b; -} - -// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow -static int Xstbi__mad2sizes_valid(int a, int b, int add) -{ - return Xstbi__mul2sizes_valid(a, b) && Xstbi__addsizes_valid(a*b, add); -} - -// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow -static int Xstbi__mad3sizes_valid(int a, int b, int c, int add) -{ - return Xstbi__mul2sizes_valid(a, b) && Xstbi__mul2sizes_valid(a*b, c) && - Xstbi__addsizes_valid(a*b*c, add); -} - -// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow -static int Xstbi__mad4sizes_valid(int a, int b, int c, int d, int add) -{ - return Xstbi__mul2sizes_valid(a, b) && Xstbi__mul2sizes_valid(a*b, c) && - Xstbi__mul2sizes_valid(a*b*c, d) && Xstbi__addsizes_valid(a*b*c*d, add); -} - -// mallocs with size overflow checking -static void *Xstbi__malloc_mad2(int a, int b, int add) -{ - if (!Xstbi__mad2sizes_valid(a, b, add)) return NULL; - return Xstbi__malloc(a*b + add); -} - -static void *Xstbi__malloc_mad3(int a, int b, int c, int add) -{ - if (!Xstbi__mad3sizes_valid(a, b, c, add)) return NULL; - return Xstbi__malloc(a*b*c + add); -} - -static void *Xstbi__malloc_mad4(int a, int b, int c, int d, int add) -{ - if (!Xstbi__mad4sizes_valid(a, b, c, d, add)) return NULL; - return Xstbi__malloc(a*b*c*d + add); -} - -// Xstbi__err - error -// Xstbi__errpf - error returning pointer to float -// Xstbi__errpuc - error returning pointer to unsigned char - -#ifdef STBI_NO_FAILURE_STRINGS - #define Xstbi__err(x,y) 0 -#elif defined(STBI_FAILURE_USERMSG) - #define Xstbi__err(x,y) Xstbi__err(y) -#else - #define Xstbi__err(x,y) Xstbi__err(x) -#endif - -#define Xstbi__errpf(x,y) ((float *)(size_t) (Xstbi__err(x,y)?NULL:NULL)) -#define Xstbi__errpuc(x,y) ((unsigned char *)(size_t) (Xstbi__err(x,y)?NULL:NULL)) - -STBIDEF void Xstbi_image_free(void *retval_from_Xstbi_load) -{ - STBI_FREE(retval_from_Xstbi_load); -} - -#ifndef STBI_NO_LINEAR -static float *Xstbi__ldr_to_hdr(Xstbi_uc *data, int x, int y, int comp); -#endif - -#ifndef STBI_NO_HDR -static Xstbi_uc *Xstbi__hdr_to_ldr(float *data, int x, int y, int comp); -#endif - -static int Xstbi__vertically_flip_on_load = 0; - -STBIDEF void Xstbi_set_flip_vertically_on_load(int flag_true_if_should_flip) -{ - Xstbi__vertically_flip_on_load = flag_true_if_should_flip; -} - -static void *Xstbi__load_main(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri, int bpc) -{ - memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields - ri->bits_per_channel = 8; // default is 8 so most paths don't have to be changed - ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here so we can add BGR order - ri->num_channels = 0; - - #ifndef STBI_NO_JPEG - if (Xstbi__jpeg_test(s)) return Xstbi__jpeg_load(s,x,y,comp,req_comp, ri); - #endif - #ifndef STBI_NO_PNG - if (Xstbi__png_test(s)) return Xstbi__png_load(s,x,y,comp,req_comp, ri); - #endif - #ifndef STBI_NO_BMP - if (Xstbi__bmp_test(s)) return Xstbi__bmp_load(s,x,y,comp,req_comp, ri); - #endif - #ifndef STBI_NO_GIF - if (Xstbi__gif_test(s)) return Xstbi__gif_load(s,x,y,comp,req_comp, ri); - #endif - #ifndef STBI_NO_PSD - if (Xstbi__psd_test(s)) return Xstbi__psd_load(s,x,y,comp,req_comp, ri, bpc); - #endif - #ifndef STBI_NO_PIC - if (Xstbi__pic_test(s)) return Xstbi__pic_load(s,x,y,comp,req_comp, ri); - #endif - #ifndef STBI_NO_PNM - if (Xstbi__pnm_test(s)) return Xstbi__pnm_load(s,x,y,comp,req_comp, ri); - #endif - - #ifndef STBI_NO_HDR - if (Xstbi__hdr_test(s)) { - float *hdr = Xstbi__hdr_load(s, x,y,comp,req_comp, ri); - return Xstbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); - } - #endif - - #ifndef STBI_NO_TGA - // test tga last because it's a crappy test! - if (Xstbi__tga_test(s)) - return Xstbi__tga_load(s,x,y,comp,req_comp, ri); - #endif - - return Xstbi__errpuc("unknown image type", "Image not of any known type, or corrupt"); -} - -static Xstbi_uc *Xstbi__convert_16_to_8(Xstbi__uint16 *orig, int w, int h, int channels) -{ - int i; - int img_len = w * h * channels; - Xstbi_uc *reduced; - - reduced = (Xstbi_uc *) Xstbi__malloc(img_len); - if (reduced == NULL) return Xstbi__errpuc("outofmem", "Out of memory"); - - for (i = 0; i < img_len; ++i) - reduced[i] = (Xstbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient approx of 16->8 bit scaling - - STBI_FREE(orig); - return reduced; -} - -static Xstbi__uint16 *Xstbi__convert_8_to_16(Xstbi_uc *orig, int w, int h, int channels) -{ - int i; - int img_len = w * h * channels; - Xstbi__uint16 *enlarged; - - enlarged = (Xstbi__uint16 *) Xstbi__malloc(img_len*2); - if (enlarged == NULL) return (Xstbi__uint16 *) Xstbi__errpuc("outofmem", "Out of memory"); - - for (i = 0; i < img_len; ++i) - enlarged[i] = (Xstbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff - - STBI_FREE(orig); - return enlarged; -} - -static unsigned char *Xstbi__load_and_postprocess_8bit(Xstbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - Xstbi__result_info ri; - void *result = Xstbi__load_main(s, x, y, comp, req_comp, &ri, 8); - - if (result == NULL) - return NULL; - - if (ri.bits_per_channel != 8) { - STBI_ASSERT(ri.bits_per_channel == 16); - result = Xstbi__convert_16_to_8((Xstbi__uint16 *) result, *x, *y, req_comp == 0 ? *comp : req_comp); - ri.bits_per_channel = 8; - } - - // @TODO: move Xstbi__convert_format to here - - if (Xstbi__vertically_flip_on_load) { - int w = *x, h = *y; - int channels = req_comp ? req_comp : *comp; - int row,col,z; - Xstbi_uc *image = (Xstbi_uc *) result; - - // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once - for (row = 0; row < (h>>1); row++) { - for (col = 0; col < w; col++) { - for (z = 0; z < channels; z++) { - Xstbi_uc temp = image[(row * w + col) * channels + z]; - image[(row * w + col) * channels + z] = image[((h - row - 1) * w + col) * channels + z]; - image[((h - row - 1) * w + col) * channels + z] = temp; - } - } - } - } - - return (unsigned char *) result; -} - -static Xstbi__uint16 *Xstbi__load_and_postprocess_16bit(Xstbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - Xstbi__result_info ri; - void *result = Xstbi__load_main(s, x, y, comp, req_comp, &ri, 16); - - if (result == NULL) - return NULL; - - if (ri.bits_per_channel != 16) { - STBI_ASSERT(ri.bits_per_channel == 8); - result = Xstbi__convert_8_to_16((Xstbi_uc *) result, *x, *y, req_comp == 0 ? *comp : req_comp); - ri.bits_per_channel = 16; - } - - // @TODO: move Xstbi__convert_format16 to here - // @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to keep more precision - - if (Xstbi__vertically_flip_on_load) { - int w = *x, h = *y; - int channels = req_comp ? req_comp : *comp; - int row,col,z; - Xstbi__uint16 *image = (Xstbi__uint16 *) result; - - // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once - for (row = 0; row < (h>>1); row++) { - for (col = 0; col < w; col++) { - for (z = 0; z < channels; z++) { - Xstbi__uint16 temp = image[(row * w + col) * channels + z]; - image[(row * w + col) * channels + z] = image[((h - row - 1) * w + col) * channels + z]; - image[((h - row - 1) * w + col) * channels + z] = temp; - } - } - } - } - - return (Xstbi__uint16 *) result; -} - -#ifndef STBI_NO_HDR -static void Xstbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp) -{ - if (Xstbi__vertically_flip_on_load && result != NULL) { - int w = *x, h = *y; - int depth = req_comp ? req_comp : *comp; - int row,col,z; - float temp; - - // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once - for (row = 0; row < (h>>1); row++) { - for (col = 0; col < w; col++) { - for (z = 0; z < depth; z++) { - temp = result[(row * w + col) * depth + z]; - result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z]; - result[((h - row - 1) * w + col) * depth + z] = temp; - } - } - } - } -} -#endif - -#ifndef STBI_NO_STDIO - -static FILE *Xstbi__fopen(char const *filename, char const *mode) -{ - FILE *f; -#if defined(_MSC_VER) && _MSC_VER >= 1400 - if (0 != fopen_s(&f, filename, mode)) - f=0; -#else - f = fopen(filename, mode); -#endif - return f; -} - - -STBIDEF Xstbi_uc *Xstbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) -{ - FILE *f = Xstbi__fopen(filename, "rb"); - unsigned char *result; - if (!f) return Xstbi__errpuc("can't fopen", "Unable to open file"); - result = Xstbi_load_from_file(f,x,y,comp,req_comp); - fclose(f); - return result; -} - -STBIDEF Xstbi_uc *Xstbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - unsigned char *result; - Xstbi__context s; - Xstbi__start_file(&s,f); - result = Xstbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); - if (result) { - // need to 'unget' all the characters in the IO buffer - fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); - } - return result; -} - -STBIDEF Xstbi__uint16 *Xstbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - Xstbi__uint16 *result; - Xstbi__context s; - Xstbi__start_file(&s,f); - result = Xstbi__load_and_postprocess_16bit(&s,x,y,comp,req_comp); - if (result) { - // need to 'unget' all the characters in the IO buffer - fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); - } - return result; -} - -STBIDEF Xstbi_us *Xstbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp) -{ - FILE *f = Xstbi__fopen(filename, "rb"); - Xstbi__uint16 *result; - if (!f) return (Xstbi_us *) Xstbi__errpuc("can't fopen", "Unable to open file"); - result = Xstbi_load_from_file_16(f,x,y,comp,req_comp); - fclose(f); - return result; -} - - -#endif //!STBI_NO_STDIO - -STBIDEF Xstbi_uc *Xstbi_load_from_memory(Xstbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - Xstbi__context s; - Xstbi__start_mem(&s,buffer,len); - return Xstbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); -} - -STBIDEF Xstbi_uc *Xstbi_load_from_callbacks(Xstbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) -{ - Xstbi__context s; - Xstbi__start_callbacks(&s, (Xstbi_io_callbacks *) clbk, user); - return Xstbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); -} - -#ifndef STBI_NO_LINEAR -static float *Xstbi__loadf_main(Xstbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - unsigned char *data; - #ifndef STBI_NO_HDR - if (Xstbi__hdr_test(s)) { - Xstbi__result_info ri; - float *hdr_data = Xstbi__hdr_load(s,x,y,comp,req_comp, &ri); - if (hdr_data) - Xstbi__float_postprocess(hdr_data,x,y,comp,req_comp); - return hdr_data; - } - #endif - data = Xstbi__load_and_postprocess_8bit(s, x, y, comp, req_comp); - if (data) - return Xstbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); - return Xstbi__errpf("unknown image type", "Image not of any known type, or corrupt"); -} - -STBIDEF float *Xstbi_loadf_from_memory(Xstbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - Xstbi__context s; - Xstbi__start_mem(&s,buffer,len); - return Xstbi__loadf_main(&s,x,y,comp,req_comp); -} - -STBIDEF float *Xstbi_loadf_from_callbacks(Xstbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) -{ - Xstbi__context s; - Xstbi__start_callbacks(&s, (Xstbi_io_callbacks *) clbk, user); - return Xstbi__loadf_main(&s,x,y,comp,req_comp); -} - -#ifndef STBI_NO_STDIO -STBIDEF float *Xstbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp) -{ - float *result; - FILE *f = Xstbi__fopen(filename, "rb"); - if (!f) return Xstbi__errpf("can't fopen", "Unable to open file"); - result = Xstbi_loadf_from_file(f,x,y,comp,req_comp); - fclose(f); - return result; -} - -STBIDEF float *Xstbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - Xstbi__context s; - Xstbi__start_file(&s,f); - return Xstbi__loadf_main(&s,x,y,comp,req_comp); -} -#endif // !STBI_NO_STDIO - -#endif // !STBI_NO_LINEAR - -// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is -// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always -// reports false! - -STBIDEF int Xstbi_is_hdr_from_memory(Xstbi_uc const *buffer, int len) -{ - #ifndef STBI_NO_HDR - Xstbi__context s; - Xstbi__start_mem(&s,buffer,len); - return Xstbi__hdr_test(&s); - #else - STBI_NOTUSED(buffer); - STBI_NOTUSED(len); - return 0; - #endif -} - -#ifndef STBI_NO_STDIO -STBIDEF int Xstbi_is_hdr (char const *filename) -{ - FILE *f = Xstbi__fopen(filename, "rb"); - int result=0; - if (f) { - result = Xstbi_is_hdr_from_file(f); - fclose(f); - } - return result; -} - -STBIDEF int Xstbi_is_hdr_from_file(FILE *f) -{ - #ifndef STBI_NO_HDR - Xstbi__context s; - Xstbi__start_file(&s,f); - return Xstbi__hdr_test(&s); - #else - STBI_NOTUSED(f); - return 0; - #endif -} -#endif // !STBI_NO_STDIO - -STBIDEF int Xstbi_is_hdr_from_callbacks(Xstbi_io_callbacks const *clbk, void *user) -{ - #ifndef STBI_NO_HDR - Xstbi__context s; - Xstbi__start_callbacks(&s, (Xstbi_io_callbacks *) clbk, user); - return Xstbi__hdr_test(&s); - #else - STBI_NOTUSED(clbk); - STBI_NOTUSED(user); - return 0; - #endif -} - -#ifndef STBI_NO_LINEAR -static float Xstbi__l2h_gamma=2.2f, Xstbi__l2h_scale=1.0f; - -STBIDEF void Xstbi_ldr_to_hdr_gamma(float gamma) { Xstbi__l2h_gamma = gamma; } -STBIDEF void Xstbi_ldr_to_hdr_scale(float scale) { Xstbi__l2h_scale = scale; } -#endif - -static float Xstbi__h2l_gamma_i=1.0f/2.2f, Xstbi__h2l_scale_i=1.0f; - -STBIDEF void Xstbi_hdr_to_ldr_gamma(float gamma) { Xstbi__h2l_gamma_i = 1/gamma; } -STBIDEF void Xstbi_hdr_to_ldr_scale(float scale) { Xstbi__h2l_scale_i = 1/scale; } - - -////////////////////////////////////////////////////////////////////////////// -// -// Common code used by all image loaders -// - -enum -{ - STBI__SCAN_load=0, - STBI__SCAN_type, - STBI__SCAN_header -}; - -static void Xstbi__refill_buffer(Xstbi__context *s) -{ - int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen); - if (n == 0) { - // at end of file, treat same as if from memory, but need to handle case - // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file - s->read_from_callbacks = 0; - s->img_buffer = s->buffer_start; - s->img_buffer_end = s->buffer_start+1; - *s->img_buffer = 0; - } else { - s->img_buffer = s->buffer_start; - s->img_buffer_end = s->buffer_start + n; - } -} - -Xstbi_inline static Xstbi_uc Xstbi__get8(Xstbi__context *s) -{ - if (s->img_buffer < s->img_buffer_end) - return *s->img_buffer++; - if (s->read_from_callbacks) { - Xstbi__refill_buffer(s); - return *s->img_buffer++; - } - return 0; -} - -Xstbi_inline static int Xstbi__at_eof(Xstbi__context *s) -{ - if (s->io.read) { - if (!(s->io.eof)(s->io_user_data)) return 0; - // if feof() is true, check if buffer = end - // special case: we've only got the special 0 character at the end - if (s->read_from_callbacks == 0) return 1; - } - - return s->img_buffer >= s->img_buffer_end; -} - -static void Xstbi__skip(Xstbi__context *s, int n) -{ - if (n < 0) { - s->img_buffer = s->img_buffer_end; - return; - } - if (s->io.read) { - int blen = (int) (s->img_buffer_end - s->img_buffer); - if (blen < n) { - s->img_buffer = s->img_buffer_end; - (s->io.skip)(s->io_user_data, n - blen); - return; - } - } - s->img_buffer += n; -} - -static int Xstbi__getn(Xstbi__context *s, Xstbi_uc *buffer, int n) -{ - if (s->io.read) { - int blen = (int) (s->img_buffer_end - s->img_buffer); - if (blen < n) { - int res, count; - - memcpy(buffer, s->img_buffer, blen); - - count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen); - res = (count == (n-blen)); - s->img_buffer = s->img_buffer_end; - return res; - } - } - - if (s->img_buffer+n <= s->img_buffer_end) { - memcpy(buffer, s->img_buffer, n); - s->img_buffer += n; - return 1; - } else - return 0; -} - -static int Xstbi__get16be(Xstbi__context *s) -{ - int z = Xstbi__get8(s); - return (z << 8) + Xstbi__get8(s); -} - -static Xstbi__uint32 Xstbi__get32be(Xstbi__context *s) -{ - Xstbi__uint32 z = Xstbi__get16be(s); - return (z << 16) + Xstbi__get16be(s); -} - -#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) -// nothing -#else -static int Xstbi__get16le(Xstbi__context *s) -{ - int z = Xstbi__get8(s); - return z + (Xstbi__get8(s) << 8); -} -#endif - -#ifndef STBI_NO_BMP -static Xstbi__uint32 Xstbi__get32le(Xstbi__context *s) -{ - Xstbi__uint32 z = Xstbi__get16le(s); - return z + (Xstbi__get16le(s) << 16); -} -#endif - -#define STBI__BYTECAST(x) ((Xstbi_uc) ((x) & 255)) // truncate int to byte without warnings - - -////////////////////////////////////////////////////////////////////////////// -// -// generic converter from built-in img_n to req_comp -// individual types do this automatically as much as possible (e.g. jpeg -// does all cases internally since it needs to colorspace convert anyway, -// and it never has alpha, so very few cases ). png can automatically -// interleave an alpha=255 channel, but falls back to this for other cases -// -// assume data buffer is malloced, so malloc a new one and free that one -// only failure mode is malloc failing - -static Xstbi_uc Xstbi__compute_y(int r, int g, int b) -{ - return (Xstbi_uc) (((r*77) + (g*150) + (29*b)) >> 8); -} - -static unsigned char *Xstbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y) -{ - int i,j; - unsigned char *good; - - if (req_comp == img_n) return data; - STBI_ASSERT(req_comp >= 1 && req_comp <= 4); - - good = (unsigned char *) Xstbi__malloc_mad3(req_comp, x, y, 0); - if (good == NULL) { - STBI_FREE(data); - return Xstbi__errpuc("outofmem", "Out of memory"); - } - - for (j=0; j < (int) y; ++j) { - unsigned char *src = data + j * x * img_n ; - unsigned char *dest = good + j * x * req_comp; - - #define STBI__COMBO(a,b) ((a)*8+(b)) - #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) - // convert source image with img_n components to one with req_comp components; - // avoid switch per pixel, so use switch per scanline and massive macros - switch (STBI__COMBO(img_n, req_comp)) { - STBI__CASE(1,2) { dest[0]=src[0], dest[1]=255; } break; - STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; - STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; } break; - STBI__CASE(2,1) { dest[0]=src[0]; } break; - STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; - STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; } break; - STBI__CASE(3,4) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; } break; - STBI__CASE(3,1) { dest[0]=Xstbi__compute_y(src[0],src[1],src[2]); } break; - STBI__CASE(3,2) { dest[0]=Xstbi__compute_y(src[0],src[1],src[2]), dest[1] = 255; } break; - STBI__CASE(4,1) { dest[0]=Xstbi__compute_y(src[0],src[1],src[2]); } break; - STBI__CASE(4,2) { dest[0]=Xstbi__compute_y(src[0],src[1],src[2]), dest[1] = src[3]; } break; - STBI__CASE(4,3) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; } break; - default: STBI_ASSERT(0); - } - #undef STBI__CASE - } - - STBI_FREE(data); - return good; -} - -static Xstbi__uint16 Xstbi__compute_y_16(int r, int g, int b) -{ - return (Xstbi__uint16) (((r*77) + (g*150) + (29*b)) >> 8); -} - -static Xstbi__uint16 *Xstbi__convert_format16(Xstbi__uint16 *data, int img_n, int req_comp, unsigned int x, unsigned int y) -{ - int i,j; - Xstbi__uint16 *good; - - if (req_comp == img_n) return data; - STBI_ASSERT(req_comp >= 1 && req_comp <= 4); - - good = (Xstbi__uint16 *) Xstbi__malloc(req_comp * x * y * 2); - if (good == NULL) { - STBI_FREE(data); - return (Xstbi__uint16 *) Xstbi__errpuc("outofmem", "Out of memory"); - } - - for (j=0; j < (int) y; ++j) { - Xstbi__uint16 *src = data + j * x * img_n ; - Xstbi__uint16 *dest = good + j * x * req_comp; - - #define STBI__COMBO(a,b) ((a)*8+(b)) - #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) - // convert source image with img_n components to one with req_comp components; - // avoid switch per pixel, so use switch per scanline and massive macros - switch (STBI__COMBO(img_n, req_comp)) { - STBI__CASE(1,2) { dest[0]=src[0], dest[1]=0xffff; } break; - STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; - STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=0xffff; } break; - STBI__CASE(2,1) { dest[0]=src[0]; } break; - STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; - STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; } break; - STBI__CASE(3,4) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=0xffff; } break; - STBI__CASE(3,1) { dest[0]=Xstbi__compute_y_16(src[0],src[1],src[2]); } break; - STBI__CASE(3,2) { dest[0]=Xstbi__compute_y_16(src[0],src[1],src[2]), dest[1] = 0xffff; } break; - STBI__CASE(4,1) { dest[0]=Xstbi__compute_y_16(src[0],src[1],src[2]); } break; - STBI__CASE(4,2) { dest[0]=Xstbi__compute_y_16(src[0],src[1],src[2]), dest[1] = src[3]; } break; - STBI__CASE(4,3) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; } break; - default: STBI_ASSERT(0); - } - #undef STBI__CASE - } - - STBI_FREE(data); - return good; -} - -#ifndef STBI_NO_LINEAR -static float *Xstbi__ldr_to_hdr(Xstbi_uc *data, int x, int y, int comp) -{ - int i,k,n; - float *output; - if (!data) return NULL; - output = (float *) Xstbi__malloc_mad4(x, y, comp, sizeof(float), 0); - if (output == NULL) { STBI_FREE(data); return Xstbi__errpf("outofmem", "Out of memory"); } - // compute number of non-alpha components - if (comp & 1) n = comp; else n = comp-1; - for (i=0; i < x*y; ++i) { - for (k=0; k < n; ++k) { - output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, Xstbi__l2h_gamma) * Xstbi__l2h_scale); - } - if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f; - } - STBI_FREE(data); - return output; -} -#endif - -#ifndef STBI_NO_HDR -#define Xstbi__float2int(x) ((int) (x)) -static Xstbi_uc *Xstbi__hdr_to_ldr(float *data, int x, int y, int comp) -{ - int i,k,n; - Xstbi_uc *output; - if (!data) return NULL; - output = (Xstbi_uc *) Xstbi__malloc_mad3(x, y, comp, 0); - if (output == NULL) { STBI_FREE(data); return Xstbi__errpuc("outofmem", "Out of memory"); } - // compute number of non-alpha components - if (comp & 1) n = comp; else n = comp-1; - for (i=0; i < x*y; ++i) { - for (k=0; k < n; ++k) { - float z = (float) pow(data[i*comp+k]*Xstbi__h2l_scale_i, Xstbi__h2l_gamma_i) * 255 + 0.5f; - if (z < 0) z = 0; - if (z > 255) z = 255; - output[i*comp + k] = (Xstbi_uc) Xstbi__float2int(z); - } - if (k < comp) { - float z = data[i*comp+k] * 255 + 0.5f; - if (z < 0) z = 0; - if (z > 255) z = 255; - output[i*comp + k] = (Xstbi_uc) Xstbi__float2int(z); - } - } - STBI_FREE(data); - return output; -} -#endif - -////////////////////////////////////////////////////////////////////////////// -// -// "baseline" JPEG/JFIF decoder -// -// simple implementation -// - doesn't support delayed output of y-dimension -// - simple interface (only one output format: 8-bit interleaved RGB) -// - doesn't try to recover corrupt jpegs -// - doesn't allow partial loading, loading multiple at once -// - still fast on x86 (copying globals into locals doesn't help x86) -// - allocates lots of intermediate memory (full size of all components) -// - non-interleaved case requires this anyway -// - allows good upsampling (see next) -// high-quality -// - upsampled channels are bilinearly interpolated, even across blocks -// - quality integer IDCT derived from IJG's 'slow' -// performance -// - fast huffman; reasonable integer IDCT -// - some SIMD kernels for common paths on targets with SSE2/NEON -// - uses a lot of intermediate memory, could cache poorly - -#ifndef STBI_NO_JPEG - -// huffman decoding acceleration -#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache - -typedef struct -{ - Xstbi_uc fast[1 << FAST_BITS]; - // weirdly, repacking this into AoS is a 10% speed loss, instead of a win - Xstbi__uint16 code[256]; - Xstbi_uc values[256]; - Xstbi_uc size[257]; - unsigned int maxcode[18]; - int delta[17]; // old 'firstsymbol' - old 'firstcode' -} Xstbi__huffman; - -typedef struct -{ - Xstbi__context *s; - Xstbi__huffman huff_dc[4]; - Xstbi__huffman huff_ac[4]; - Xstbi_uc dequant[4][64]; - Xstbi__int16 fast_ac[4][1 << FAST_BITS]; - -// sizes for components, interleaved MCUs - int img_h_max, img_v_max; - int img_mcu_x, img_mcu_y; - int img_mcu_w, img_mcu_h; - -// definition of jpeg image component - struct - { - int id; - int h,v; - int tq; - int hd,ha; - int dc_pred; - - int x,y,w2,h2; - Xstbi_uc *data; - void *raw_data, *raw_coeff; - Xstbi_uc *linebuf; - short *coeff; // progressive only - int coeff_w, coeff_h; // number of 8x8 coefficient blocks - } img_comp[4]; - - Xstbi__uint32 code_buffer; // jpeg entropy-coded buffer - int code_bits; // number of valid bits - unsigned char marker; // marker seen while filling entropy buffer - int nomore; // flag if we saw a marker so must stop - - int progressive; - int spec_start; - int spec_end; - int succ_high; - int succ_low; - int eob_run; - int rgb; - - int scan_n, order[4]; - int restart_interval, todo; - -// kernels - void (*idct_block_kernel)(Xstbi_uc *out, int out_stride, short data[64]); - void (*YCbCr_to_RGB_kernel)(Xstbi_uc *out, const Xstbi_uc *y, const Xstbi_uc *pcb, const Xstbi_uc *pcr, int count, int step); - Xstbi_uc *(*resample_row_hv_2_kernel)(Xstbi_uc *out, Xstbi_uc *in_near, Xstbi_uc *in_far, int w, int hs); -} Xstbi__jpeg; - -static int Xstbi__build_huffman(Xstbi__huffman *h, int *count) -{ - int i,j,k=0,code; - // build size list for each symbol (from JPEG spec) - for (i=0; i < 16; ++i) - for (j=0; j < count[i]; ++j) - h->size[k++] = (Xstbi_uc) (i+1); - h->size[k] = 0; - - // compute actual symbols (from jpeg spec) - code = 0; - k = 0; - for(j=1; j <= 16; ++j) { - // compute delta to add to code to compute symbol id - h->delta[j] = k - code; - if (h->size[k] == j) { - while (h->size[k] == j) - h->code[k++] = (Xstbi__uint16) (code++); - if (code-1 >= (1 << j)) return Xstbi__err("bad code lengths","Corrupt JPEG"); - } - // compute largest code + 1 for this size, preshifted as needed later - h->maxcode[j] = code << (16-j); - code <<= 1; - } - h->maxcode[j] = 0xffffffff; - - // build non-spec acceleration table; 255 is flag for not-accelerated - memset(h->fast, 255, 1 << FAST_BITS); - for (i=0; i < k; ++i) { - int s = h->size[i]; - if (s <= FAST_BITS) { - int c = h->code[i] << (FAST_BITS-s); - int m = 1 << (FAST_BITS-s); - for (j=0; j < m; ++j) { - h->fast[c+j] = (Xstbi_uc) i; - } - } - } - return 1; -} - -// build a table that decodes both magnitude and value of small ACs in -// one go. -static void Xstbi__build_fast_ac(Xstbi__int16 *fast_ac, Xstbi__huffman *h) -{ - int i; - for (i=0; i < (1 << FAST_BITS); ++i) { - Xstbi_uc fast = h->fast[i]; - fast_ac[i] = 0; - if (fast < 255) { - int rs = h->values[fast]; - int run = (rs >> 4) & 15; - int magbits = rs & 15; - int len = h->size[fast]; - - if (magbits && len + magbits <= FAST_BITS) { - // magnitude code followed by receive_extend code - int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits); - int m = 1 << (magbits - 1); - if (k < m) k += (-1 << magbits) + 1; - // if the result is small enough, we can fit it in fast_ac table - if (k >= -128 && k <= 127) - fast_ac[i] = (Xstbi__int16) ((k << 8) + (run << 4) + (len + magbits)); - } - } - } -} - -static void Xstbi__grow_buffer_unsafe(Xstbi__jpeg *j) -{ - do { - int b = j->nomore ? 0 : Xstbi__get8(j->s); - if (b == 0xff) { - int c = Xstbi__get8(j->s); - if (c != 0) { - j->marker = (unsigned char) c; - j->nomore = 1; - return; - } - } - j->code_buffer |= b << (24 - j->code_bits); - j->code_bits += 8; - } while (j->code_bits <= 24); -} - -// (1 << n) - 1 -static Xstbi__uint32 Xstbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535}; - -// decode a jpeg huffman value from the bitstream -Xstbi_inline static int Xstbi__jpeg_huff_decode(Xstbi__jpeg *j, Xstbi__huffman *h) -{ - unsigned int temp; - int c,k; - - if (j->code_bits < 16) Xstbi__grow_buffer_unsafe(j); - - // look at the top FAST_BITS and determine what symbol ID it is, - // if the code is <= FAST_BITS - c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); - k = h->fast[c]; - if (k < 255) { - int s = h->size[k]; - if (s > j->code_bits) - return -1; - j->code_buffer <<= s; - j->code_bits -= s; - return h->values[k]; - } - - // naive test is to shift the code_buffer down so k bits are - // valid, then test against maxcode. To speed this up, we've - // preshifted maxcode left so that it has (16-k) 0s at the - // end; in other words, regardless of the number of bits, it - // wants to be compared against something shifted to have 16; - // that way we don't need to shift inside the loop. - temp = j->code_buffer >> 16; - for (k=FAST_BITS+1 ; ; ++k) - if (temp < h->maxcode[k]) - break; - if (k == 17) { - // error! code not found - j->code_bits -= 16; - return -1; - } - - if (k > j->code_bits) - return -1; - - // convert the huffman code to the symbol id - c = ((j->code_buffer >> (32 - k)) & Xstbi__bmask[k]) + h->delta[k]; - STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & Xstbi__bmask[h->size[c]]) == h->code[c]); - - // convert the id to a symbol - j->code_bits -= k; - j->code_buffer <<= k; - return h->values[c]; -} - -// bias[n] = (-1<code_bits < n) Xstbi__grow_buffer_unsafe(j); - - sgn = (Xstbi__int32)j->code_buffer >> 31; // sign bit is always in MSB - k = Xstbi_lrot(j->code_buffer, n); - STBI_ASSERT(n >= 0 && n < (int) (sizeof(Xstbi__bmask)/sizeof(*Xstbi__bmask))); - j->code_buffer = k & ~Xstbi__bmask[n]; - k &= Xstbi__bmask[n]; - j->code_bits -= n; - return k + (Xstbi__jbias[n] & ~sgn); -} - -// get some unsigned bits -Xstbi_inline static int Xstbi__jpeg_get_bits(Xstbi__jpeg *j, int n) -{ - unsigned int k; - if (j->code_bits < n) Xstbi__grow_buffer_unsafe(j); - k = Xstbi_lrot(j->code_buffer, n); - j->code_buffer = k & ~Xstbi__bmask[n]; - k &= Xstbi__bmask[n]; - j->code_bits -= n; - return k; -} - -Xstbi_inline static int Xstbi__jpeg_get_bit(Xstbi__jpeg *j) -{ - unsigned int k; - if (j->code_bits < 1) Xstbi__grow_buffer_unsafe(j); - k = j->code_buffer; - j->code_buffer <<= 1; - --j->code_bits; - return k & 0x80000000; -} - -// given a value that's at position X in the zigzag stream, -// where does it appear in the 8x8 matrix coded as row-major? -static Xstbi_uc Xstbi__jpeg_dezigzag[64+15] = -{ - 0, 1, 8, 16, 9, 2, 3, 10, - 17, 24, 32, 25, 18, 11, 4, 5, - 12, 19, 26, 33, 40, 48, 41, 34, - 27, 20, 13, 6, 7, 14, 21, 28, - 35, 42, 49, 56, 57, 50, 43, 36, - 29, 22, 15, 23, 30, 37, 44, 51, - 58, 59, 52, 45, 38, 31, 39, 46, - 53, 60, 61, 54, 47, 55, 62, 63, - // let corrupt input sample past end - 63, 63, 63, 63, 63, 63, 63, 63, - 63, 63, 63, 63, 63, 63, 63 -}; - -// decode one 64-entry block-- -static int Xstbi__jpeg_decode_block(Xstbi__jpeg *j, short data[64], Xstbi__huffman *hdc, Xstbi__huffman *hac, Xstbi__int16 *fac, int b, Xstbi_uc *dequant) -{ - int diff,dc,k; - int t; - - if (j->code_bits < 16) Xstbi__grow_buffer_unsafe(j); - t = Xstbi__jpeg_huff_decode(j, hdc); - if (t < 0) return Xstbi__err("bad huffman code","Corrupt JPEG"); - - // 0 all the ac values now so we can do it 32-bits at a time - memset(data,0,64*sizeof(data[0])); - - diff = t ? Xstbi__extend_receive(j, t) : 0; - dc = j->img_comp[b].dc_pred + diff; - j->img_comp[b].dc_pred = dc; - data[0] = (short) (dc * dequant[0]); - - // decode AC components, see JPEG spec - k = 1; - do { - unsigned int zig; - int c,r,s; - if (j->code_bits < 16) Xstbi__grow_buffer_unsafe(j); - c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); - r = fac[c]; - if (r) { // fast-AC path - k += (r >> 4) & 15; // run - s = r & 15; // combined length - j->code_buffer <<= s; - j->code_bits -= s; - // decode into unzigzag'd location - zig = Xstbi__jpeg_dezigzag[k++]; - data[zig] = (short) ((r >> 8) * dequant[zig]); - } else { - int rs = Xstbi__jpeg_huff_decode(j, hac); - if (rs < 0) return Xstbi__err("bad huffman code","Corrupt JPEG"); - s = rs & 15; - r = rs >> 4; - if (s == 0) { - if (rs != 0xf0) break; // end block - k += 16; - } else { - k += r; - // decode into unzigzag'd location - zig = Xstbi__jpeg_dezigzag[k++]; - data[zig] = (short) (Xstbi__extend_receive(j,s) * dequant[zig]); - } - } - } while (k < 64); - return 1; -} - -static int Xstbi__jpeg_decode_block_prog_dc(Xstbi__jpeg *j, short data[64], Xstbi__huffman *hdc, int b) -{ - int diff,dc; - int t; - if (j->spec_end != 0) return Xstbi__err("can't merge dc and ac", "Corrupt JPEG"); - - if (j->code_bits < 16) Xstbi__grow_buffer_unsafe(j); - - if (j->succ_high == 0) { - // first scan for DC coefficient, must be first - memset(data,0,64*sizeof(data[0])); // 0 all the ac values now - t = Xstbi__jpeg_huff_decode(j, hdc); - diff = t ? Xstbi__extend_receive(j, t) : 0; - - dc = j->img_comp[b].dc_pred + diff; - j->img_comp[b].dc_pred = dc; - data[0] = (short) (dc << j->succ_low); - } else { - // refinement scan for DC coefficient - if (Xstbi__jpeg_get_bit(j)) - data[0] += (short) (1 << j->succ_low); - } - return 1; -} - -// @OPTIMIZE: store non-zigzagged during the decode passes, -// and only de-zigzag when dequantizing -static int Xstbi__jpeg_decode_block_prog_ac(Xstbi__jpeg *j, short data[64], Xstbi__huffman *hac, Xstbi__int16 *fac) -{ - int k; - if (j->spec_start == 0) return Xstbi__err("can't merge dc and ac", "Corrupt JPEG"); - - if (j->succ_high == 0) { - int shift = j->succ_low; - - if (j->eob_run) { - --j->eob_run; - return 1; - } - - k = j->spec_start; - do { - unsigned int zig; - int c,r,s; - if (j->code_bits < 16) Xstbi__grow_buffer_unsafe(j); - c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); - r = fac[c]; - if (r) { // fast-AC path - k += (r >> 4) & 15; // run - s = r & 15; // combined length - j->code_buffer <<= s; - j->code_bits -= s; - zig = Xstbi__jpeg_dezigzag[k++]; - data[zig] = (short) ((r >> 8) << shift); - } else { - int rs = Xstbi__jpeg_huff_decode(j, hac); - if (rs < 0) return Xstbi__err("bad huffman code","Corrupt JPEG"); - s = rs & 15; - r = rs >> 4; - if (s == 0) { - if (r < 15) { - j->eob_run = (1 << r); - if (r) - j->eob_run += Xstbi__jpeg_get_bits(j, r); - --j->eob_run; - break; - } - k += 16; - } else { - k += r; - zig = Xstbi__jpeg_dezigzag[k++]; - data[zig] = (short) (Xstbi__extend_receive(j,s) << shift); - } - } - } while (k <= j->spec_end); - } else { - // refinement scan for these AC coefficients - - short bit = (short) (1 << j->succ_low); - - if (j->eob_run) { - --j->eob_run; - for (k = j->spec_start; k <= j->spec_end; ++k) { - short *p = &data[Xstbi__jpeg_dezigzag[k]]; - if (*p != 0) - if (Xstbi__jpeg_get_bit(j)) - if ((*p & bit)==0) { - if (*p > 0) - *p += bit; - else - *p -= bit; - } - } - } else { - k = j->spec_start; - do { - int r,s; - int rs = Xstbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh - if (rs < 0) return Xstbi__err("bad huffman code","Corrupt JPEG"); - s = rs & 15; - r = rs >> 4; - if (s == 0) { - if (r < 15) { - j->eob_run = (1 << r) - 1; - if (r) - j->eob_run += Xstbi__jpeg_get_bits(j, r); - r = 64; // force end of block - } else { - // r=15 s=0 should write 16 0s, so we just do - // a run of 15 0s and then write s (which is 0), - // so we don't have to do anything special here - } - } else { - if (s != 1) return Xstbi__err("bad huffman code", "Corrupt JPEG"); - // sign bit - if (Xstbi__jpeg_get_bit(j)) - s = bit; - else - s = -bit; - } - - // advance by r - while (k <= j->spec_end) { - short *p = &data[Xstbi__jpeg_dezigzag[k++]]; - if (*p != 0) { - if (Xstbi__jpeg_get_bit(j)) - if ((*p & bit)==0) { - if (*p > 0) - *p += bit; - else - *p -= bit; - } - } else { - if (r == 0) { - *p = (short) s; - break; - } - --r; - } - } - } while (k <= j->spec_end); - } - } - return 1; -} - -// take a -128..127 value and Xstbi__clamp it and convert to 0..255 -Xstbi_inline static Xstbi_uc Xstbi__clamp(int x) -{ - // trick to use a single test to catch both cases - if ((unsigned int) x > 255) { - if (x < 0) return 0; - if (x > 255) return 255; - } - return (Xstbi_uc) x; -} - -#define Xstbi__f2f(x) ((int) (((x) * 4096 + 0.5))) -#define Xstbi__fsh(x) ((x) << 12) - -// derived from jidctint -- DCT_ISLOW -#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ - int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ - p2 = s2; \ - p3 = s6; \ - p1 = (p2+p3) * Xstbi__f2f(0.5411961f); \ - t2 = p1 + p3*Xstbi__f2f(-1.847759065f); \ - t3 = p1 + p2*Xstbi__f2f( 0.765366865f); \ - p2 = s0; \ - p3 = s4; \ - t0 = Xstbi__fsh(p2+p3); \ - t1 = Xstbi__fsh(p2-p3); \ - x0 = t0+t3; \ - x3 = t0-t3; \ - x1 = t1+t2; \ - x2 = t1-t2; \ - t0 = s7; \ - t1 = s5; \ - t2 = s3; \ - t3 = s1; \ - p3 = t0+t2; \ - p4 = t1+t3; \ - p1 = t0+t3; \ - p2 = t1+t2; \ - p5 = (p3+p4)*Xstbi__f2f( 1.175875602f); \ - t0 = t0*Xstbi__f2f( 0.298631336f); \ - t1 = t1*Xstbi__f2f( 2.053119869f); \ - t2 = t2*Xstbi__f2f( 3.072711026f); \ - t3 = t3*Xstbi__f2f( 1.501321110f); \ - p1 = p5 + p1*Xstbi__f2f(-0.899976223f); \ - p2 = p5 + p2*Xstbi__f2f(-2.562915447f); \ - p3 = p3*Xstbi__f2f(-1.961570560f); \ - p4 = p4*Xstbi__f2f(-0.390180644f); \ - t3 += p1+p4; \ - t2 += p2+p3; \ - t1 += p2+p4; \ - t0 += p1+p3; - -static void Xstbi__idct_block(Xstbi_uc *out, int out_stride, short data[64]) -{ - int i,val[64],*v=val; - Xstbi_uc *o; - short *d = data; - - // columns - for (i=0; i < 8; ++i,++d, ++v) { - // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing - if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 - && d[40]==0 && d[48]==0 && d[56]==0) { - // no shortcut 0 seconds - // (1|2|3|4|5|6|7)==0 0 seconds - // all separate -0.047 seconds - // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds - int dcterm = d[0] << 2; - v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; - } else { - STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56]) - // constants scaled things up by 1<<12; let's bring them back - // down, but keep 2 extra bits of precision - x0 += 512; x1 += 512; x2 += 512; x3 += 512; - v[ 0] = (x0+t3) >> 10; - v[56] = (x0-t3) >> 10; - v[ 8] = (x1+t2) >> 10; - v[48] = (x1-t2) >> 10; - v[16] = (x2+t1) >> 10; - v[40] = (x2-t1) >> 10; - v[24] = (x3+t0) >> 10; - v[32] = (x3-t0) >> 10; - } - } - - for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { - // no fast case since the first 1D IDCT spread components out - STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) - // constants scaled things up by 1<<12, plus we had 1<<2 from first - // loop, plus horizontal and vertical each scale by sqrt(8) so together - // we've got an extra 1<<3, so 1<<17 total we need to remove. - // so we want to round that, which means adding 0.5 * 1<<17, - // aka 65536. Also, we'll end up with -128 to 127 that we want - // to encode as 0..255 by adding 128, so we'll add that before the shift - x0 += 65536 + (128<<17); - x1 += 65536 + (128<<17); - x2 += 65536 + (128<<17); - x3 += 65536 + (128<<17); - // tried computing the shifts into temps, or'ing the temps to see - // if any were out of range, but that was slower - o[0] = Xstbi__clamp((x0+t3) >> 17); - o[7] = Xstbi__clamp((x0-t3) >> 17); - o[1] = Xstbi__clamp((x1+t2) >> 17); - o[6] = Xstbi__clamp((x1-t2) >> 17); - o[2] = Xstbi__clamp((x2+t1) >> 17); - o[5] = Xstbi__clamp((x2-t1) >> 17); - o[3] = Xstbi__clamp((x3+t0) >> 17); - o[4] = Xstbi__clamp((x3-t0) >> 17); - } -} - -#ifdef STBI_SSE2 -// sse2 integer IDCT. not the fastest possible implementation but it -// produces bit-identical results to the generic C version so it's -// fully "transparent". -static void Xstbi__idct_simd(Xstbi_uc *out, int out_stride, short data[64]) -{ - // This is constructed to match our regular (generic) integer IDCT exactly. - __m128i row0, row1, row2, row3, row4, row5, row6, row7; - __m128i tmp; - - // dot product constant: even elems=x, odd elems=y - #define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y)) - - // out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit) - // out(1) = c1[even]*x + c1[odd]*y - #define dct_rot(out0,out1, x,y,c0,c1) \ - __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \ - __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \ - __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \ - __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \ - __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \ - __m128i out1##_h = _mm_madd_epi16(c0##hi, c1) - - // out = in << 12 (in 16-bit, out 32-bit) - #define dct_widen(out, in) \ - __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \ - __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4) - - // wide add - #define dct_wadd(out, a, b) \ - __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \ - __m128i out##_h = _mm_add_epi32(a##_h, b##_h) - - // wide sub - #define dct_wsub(out, a, b) \ - __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \ - __m128i out##_h = _mm_sub_epi32(a##_h, b##_h) - - // butterfly a/b, add bias, then shift by "s" and pack - #define dct_bfly32o(out0, out1, a,b,bias,s) \ - { \ - __m128i abiased_l = _mm_add_epi32(a##_l, bias); \ - __m128i abiased_h = _mm_add_epi32(a##_h, bias); \ - dct_wadd(sum, abiased, b); \ - dct_wsub(dif, abiased, b); \ - out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \ - out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \ - } - - // 8-bit interleave step (for transposes) - #define dct_interleave8(a, b) \ - tmp = a; \ - a = _mm_unpacklo_epi8(a, b); \ - b = _mm_unpackhi_epi8(tmp, b) - - // 16-bit interleave step (for transposes) - #define dct_interleave16(a, b) \ - tmp = a; \ - a = _mm_unpacklo_epi16(a, b); \ - b = _mm_unpackhi_epi16(tmp, b) - - #define dct_pass(bias,shift) \ - { \ - /* even part */ \ - dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \ - __m128i sum04 = _mm_add_epi16(row0, row4); \ - __m128i dif04 = _mm_sub_epi16(row0, row4); \ - dct_widen(t0e, sum04); \ - dct_widen(t1e, dif04); \ - dct_wadd(x0, t0e, t3e); \ - dct_wsub(x3, t0e, t3e); \ - dct_wadd(x1, t1e, t2e); \ - dct_wsub(x2, t1e, t2e); \ - /* odd part */ \ - dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \ - dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \ - __m128i sum17 = _mm_add_epi16(row1, row7); \ - __m128i sum35 = _mm_add_epi16(row3, row5); \ - dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \ - dct_wadd(x4, y0o, y4o); \ - dct_wadd(x5, y1o, y5o); \ - dct_wadd(x6, y2o, y5o); \ - dct_wadd(x7, y3o, y4o); \ - dct_bfly32o(row0,row7, x0,x7,bias,shift); \ - dct_bfly32o(row1,row6, x1,x6,bias,shift); \ - dct_bfly32o(row2,row5, x2,x5,bias,shift); \ - dct_bfly32o(row3,row4, x3,x4,bias,shift); \ - } - - __m128i rot0_0 = dct_const(Xstbi__f2f(0.5411961f), Xstbi__f2f(0.5411961f) + Xstbi__f2f(-1.847759065f)); - __m128i rot0_1 = dct_const(Xstbi__f2f(0.5411961f) + Xstbi__f2f( 0.765366865f), Xstbi__f2f(0.5411961f)); - __m128i rot1_0 = dct_const(Xstbi__f2f(1.175875602f) + Xstbi__f2f(-0.899976223f), Xstbi__f2f(1.175875602f)); - __m128i rot1_1 = dct_const(Xstbi__f2f(1.175875602f), Xstbi__f2f(1.175875602f) + Xstbi__f2f(-2.562915447f)); - __m128i rot2_0 = dct_const(Xstbi__f2f(-1.961570560f) + Xstbi__f2f( 0.298631336f), Xstbi__f2f(-1.961570560f)); - __m128i rot2_1 = dct_const(Xstbi__f2f(-1.961570560f), Xstbi__f2f(-1.961570560f) + Xstbi__f2f( 3.072711026f)); - __m128i rot3_0 = dct_const(Xstbi__f2f(-0.390180644f) + Xstbi__f2f( 2.053119869f), Xstbi__f2f(-0.390180644f)); - __m128i rot3_1 = dct_const(Xstbi__f2f(-0.390180644f), Xstbi__f2f(-0.390180644f) + Xstbi__f2f( 1.501321110f)); - - // rounding biases in column/row passes, see Xstbi__idct_block for explanation. - __m128i bias_0 = _mm_set1_epi32(512); - __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17)); - - // load - row0 = _mm_load_si128((const __m128i *) (data + 0*8)); - row1 = _mm_load_si128((const __m128i *) (data + 1*8)); - row2 = _mm_load_si128((const __m128i *) (data + 2*8)); - row3 = _mm_load_si128((const __m128i *) (data + 3*8)); - row4 = _mm_load_si128((const __m128i *) (data + 4*8)); - row5 = _mm_load_si128((const __m128i *) (data + 5*8)); - row6 = _mm_load_si128((const __m128i *) (data + 6*8)); - row7 = _mm_load_si128((const __m128i *) (data + 7*8)); - - // column pass - dct_pass(bias_0, 10); - - { - // 16bit 8x8 transpose pass 1 - dct_interleave16(row0, row4); - dct_interleave16(row1, row5); - dct_interleave16(row2, row6); - dct_interleave16(row3, row7); - - // transpose pass 2 - dct_interleave16(row0, row2); - dct_interleave16(row1, row3); - dct_interleave16(row4, row6); - dct_interleave16(row5, row7); - - // transpose pass 3 - dct_interleave16(row0, row1); - dct_interleave16(row2, row3); - dct_interleave16(row4, row5); - dct_interleave16(row6, row7); - } - - // row pass - dct_pass(bias_1, 17); - - { - // pack - __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7 - __m128i p1 = _mm_packus_epi16(row2, row3); - __m128i p2 = _mm_packus_epi16(row4, row5); - __m128i p3 = _mm_packus_epi16(row6, row7); - - // 8bit 8x8 transpose pass 1 - dct_interleave8(p0, p2); // a0e0a1e1... - dct_interleave8(p1, p3); // c0g0c1g1... - - // transpose pass 2 - dct_interleave8(p0, p1); // a0c0e0g0... - dct_interleave8(p2, p3); // b0d0f0h0... - - // transpose pass 3 - dct_interleave8(p0, p2); // a0b0c0d0... - dct_interleave8(p1, p3); // a4b4c4d4... - - // store - _mm_storel_epi64((__m128i *) out, p0); out += out_stride; - _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride; - _mm_storel_epi64((__m128i *) out, p2); out += out_stride; - _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride; - _mm_storel_epi64((__m128i *) out, p1); out += out_stride; - _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride; - _mm_storel_epi64((__m128i *) out, p3); out += out_stride; - _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e)); - } - -#undef dct_const -#undef dct_rot -#undef dct_widen -#undef dct_wadd -#undef dct_wsub -#undef dct_bfly32o -#undef dct_interleave8 -#undef dct_interleave16 -#undef dct_pass -} - -#endif // STBI_SSE2 - -#ifdef STBI_NEON - -// NEON integer IDCT. should produce bit-identical -// results to the generic C version. -static void Xstbi__idct_simd(Xstbi_uc *out, int out_stride, short data[64]) -{ - int16x8_t row0, row1, row2, row3, row4, row5, row6, row7; - - int16x4_t rot0_0 = vdup_n_s16(Xstbi__f2f(0.5411961f)); - int16x4_t rot0_1 = vdup_n_s16(Xstbi__f2f(-1.847759065f)); - int16x4_t rot0_2 = vdup_n_s16(Xstbi__f2f( 0.765366865f)); - int16x4_t rot1_0 = vdup_n_s16(Xstbi__f2f( 1.175875602f)); - int16x4_t rot1_1 = vdup_n_s16(Xstbi__f2f(-0.899976223f)); - int16x4_t rot1_2 = vdup_n_s16(Xstbi__f2f(-2.562915447f)); - int16x4_t rot2_0 = vdup_n_s16(Xstbi__f2f(-1.961570560f)); - int16x4_t rot2_1 = vdup_n_s16(Xstbi__f2f(-0.390180644f)); - int16x4_t rot3_0 = vdup_n_s16(Xstbi__f2f( 0.298631336f)); - int16x4_t rot3_1 = vdup_n_s16(Xstbi__f2f( 2.053119869f)); - int16x4_t rot3_2 = vdup_n_s16(Xstbi__f2f( 3.072711026f)); - int16x4_t rot3_3 = vdup_n_s16(Xstbi__f2f( 1.501321110f)); - -#define dct_long_mul(out, inq, coeff) \ - int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \ - int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff) - -#define dct_long_mac(out, acc, inq, coeff) \ - int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \ - int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff) - -#define dct_widen(out, inq) \ - int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \ - int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12) - -// wide add -#define dct_wadd(out, a, b) \ - int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \ - int32x4_t out##_h = vaddq_s32(a##_h, b##_h) - -// wide sub -#define dct_wsub(out, a, b) \ - int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \ - int32x4_t out##_h = vsubq_s32(a##_h, b##_h) - -// butterfly a/b, then shift using "shiftop" by "s" and pack -#define dct_bfly32o(out0,out1, a,b,shiftop,s) \ - { \ - dct_wadd(sum, a, b); \ - dct_wsub(dif, a, b); \ - out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \ - out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \ - } - -#define dct_pass(shiftop, shift) \ - { \ - /* even part */ \ - int16x8_t sum26 = vaddq_s16(row2, row6); \ - dct_long_mul(p1e, sum26, rot0_0); \ - dct_long_mac(t2e, p1e, row6, rot0_1); \ - dct_long_mac(t3e, p1e, row2, rot0_2); \ - int16x8_t sum04 = vaddq_s16(row0, row4); \ - int16x8_t dif04 = vsubq_s16(row0, row4); \ - dct_widen(t0e, sum04); \ - dct_widen(t1e, dif04); \ - dct_wadd(x0, t0e, t3e); \ - dct_wsub(x3, t0e, t3e); \ - dct_wadd(x1, t1e, t2e); \ - dct_wsub(x2, t1e, t2e); \ - /* odd part */ \ - int16x8_t sum15 = vaddq_s16(row1, row5); \ - int16x8_t sum17 = vaddq_s16(row1, row7); \ - int16x8_t sum35 = vaddq_s16(row3, row5); \ - int16x8_t sum37 = vaddq_s16(row3, row7); \ - int16x8_t sumodd = vaddq_s16(sum17, sum35); \ - dct_long_mul(p5o, sumodd, rot1_0); \ - dct_long_mac(p1o, p5o, sum17, rot1_1); \ - dct_long_mac(p2o, p5o, sum35, rot1_2); \ - dct_long_mul(p3o, sum37, rot2_0); \ - dct_long_mul(p4o, sum15, rot2_1); \ - dct_wadd(sump13o, p1o, p3o); \ - dct_wadd(sump24o, p2o, p4o); \ - dct_wadd(sump23o, p2o, p3o); \ - dct_wadd(sump14o, p1o, p4o); \ - dct_long_mac(x4, sump13o, row7, rot3_0); \ - dct_long_mac(x5, sump24o, row5, rot3_1); \ - dct_long_mac(x6, sump23o, row3, rot3_2); \ - dct_long_mac(x7, sump14o, row1, rot3_3); \ - dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \ - dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \ - dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \ - dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \ - } - - // load - row0 = vld1q_s16(data + 0*8); - row1 = vld1q_s16(data + 1*8); - row2 = vld1q_s16(data + 2*8); - row3 = vld1q_s16(data + 3*8); - row4 = vld1q_s16(data + 4*8); - row5 = vld1q_s16(data + 5*8); - row6 = vld1q_s16(data + 6*8); - row7 = vld1q_s16(data + 7*8); - - // add DC bias - row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0)); - - // column pass - dct_pass(vrshrn_n_s32, 10); - - // 16bit 8x8 transpose - { -// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively. -// whether compilers actually get this is another story, sadly. -#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; } -#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); } -#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); } - - // pass 1 - dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6 - dct_trn16(row2, row3); - dct_trn16(row4, row5); - dct_trn16(row6, row7); - - // pass 2 - dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4 - dct_trn32(row1, row3); - dct_trn32(row4, row6); - dct_trn32(row5, row7); - - // pass 3 - dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0 - dct_trn64(row1, row5); - dct_trn64(row2, row6); - dct_trn64(row3, row7); - -#undef dct_trn16 -#undef dct_trn32 -#undef dct_trn64 - } - - // row pass - // vrshrn_n_s32 only supports shifts up to 16, we need - // 17. so do a non-rounding shift of 16 first then follow - // up with a rounding shift by 1. - dct_pass(vshrn_n_s32, 16); - - { - // pack and round - uint8x8_t p0 = vqrshrun_n_s16(row0, 1); - uint8x8_t p1 = vqrshrun_n_s16(row1, 1); - uint8x8_t p2 = vqrshrun_n_s16(row2, 1); - uint8x8_t p3 = vqrshrun_n_s16(row3, 1); - uint8x8_t p4 = vqrshrun_n_s16(row4, 1); - uint8x8_t p5 = vqrshrun_n_s16(row5, 1); - uint8x8_t p6 = vqrshrun_n_s16(row6, 1); - uint8x8_t p7 = vqrshrun_n_s16(row7, 1); - - // again, these can translate into one instruction, but often don't. -#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; } -#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); } -#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); } - - // sadly can't use interleaved stores here since we only write - // 8 bytes to each scan line! - - // 8x8 8-bit transpose pass 1 - dct_trn8_8(p0, p1); - dct_trn8_8(p2, p3); - dct_trn8_8(p4, p5); - dct_trn8_8(p6, p7); - - // pass 2 - dct_trn8_16(p0, p2); - dct_trn8_16(p1, p3); - dct_trn8_16(p4, p6); - dct_trn8_16(p5, p7); - - // pass 3 - dct_trn8_32(p0, p4); - dct_trn8_32(p1, p5); - dct_trn8_32(p2, p6); - dct_trn8_32(p3, p7); - - // store - vst1_u8(out, p0); out += out_stride; - vst1_u8(out, p1); out += out_stride; - vst1_u8(out, p2); out += out_stride; - vst1_u8(out, p3); out += out_stride; - vst1_u8(out, p4); out += out_stride; - vst1_u8(out, p5); out += out_stride; - vst1_u8(out, p6); out += out_stride; - vst1_u8(out, p7); - -#undef dct_trn8_8 -#undef dct_trn8_16 -#undef dct_trn8_32 - } - -#undef dct_long_mul -#undef dct_long_mac -#undef dct_widen -#undef dct_wadd -#undef dct_wsub -#undef dct_bfly32o -#undef dct_pass -} - -#endif // STBI_NEON - -#define STBI__MARKER_none 0xff -// if there's a pending marker from the entropy stream, return that -// otherwise, fetch from the stream and get a marker. if there's no -// marker, return 0xff, which is never a valid marker value -static Xstbi_uc Xstbi__get_marker(Xstbi__jpeg *j) -{ - Xstbi_uc x; - if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; } - x = Xstbi__get8(j->s); - if (x != 0xff) return STBI__MARKER_none; - while (x == 0xff) - x = Xstbi__get8(j->s); - return x; -} - -// in each scan, we'll have scan_n components, and the order -// of the components is specified by order[] -#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) - -// after a restart interval, Xstbi__jpeg_reset the entropy decoder and -// the dc prediction -static void Xstbi__jpeg_reset(Xstbi__jpeg *j) -{ - j->code_bits = 0; - j->code_buffer = 0; - j->nomore = 0; - j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0; - j->marker = STBI__MARKER_none; - j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; - j->eob_run = 0; - // no more than 1<<31 MCUs if no restart_interal? that's plenty safe, - // since we don't even allow 1<<30 pixels -} - -static int Xstbi__parse_entropy_coded_data(Xstbi__jpeg *z) -{ - Xstbi__jpeg_reset(z); - if (!z->progressive) { - if (z->scan_n == 1) { - int i,j; - STBI_SIMD_ALIGN(short, data[64]); - int n = z->order[0]; - // non-interleaved data, we just need to process one block at a time, - // in trivial scanline order - // number of blocks to do just depends on how many actual "pixels" this - // component has, independent of interleaved MCU blocking and such - int w = (z->img_comp[n].x+7) >> 3; - int h = (z->img_comp[n].y+7) >> 3; - for (j=0; j < h; ++j) { - for (i=0; i < w; ++i) { - int ha = z->img_comp[n].ha; - if (!Xstbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; - z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); - // every data block is an MCU, so countdown the restart interval - if (--z->todo <= 0) { - if (z->code_bits < 24) Xstbi__grow_buffer_unsafe(z); - // if it's NOT a restart, then just bail, so we get corrupt data - // rather than no data - if (!STBI__RESTART(z->marker)) return 1; - Xstbi__jpeg_reset(z); - } - } - } - return 1; - } else { // interleaved - int i,j,k,x,y; - STBI_SIMD_ALIGN(short, data[64]); - for (j=0; j < z->img_mcu_y; ++j) { - for (i=0; i < z->img_mcu_x; ++i) { - // scan an interleaved mcu... process scan_n components in order - for (k=0; k < z->scan_n; ++k) { - int n = z->order[k]; - // scan out an mcu's worth of this component; that's just determined - // by the basic H and V specified for the component - for (y=0; y < z->img_comp[n].v; ++y) { - for (x=0; x < z->img_comp[n].h; ++x) { - int x2 = (i*z->img_comp[n].h + x)*8; - int y2 = (j*z->img_comp[n].v + y)*8; - int ha = z->img_comp[n].ha; - if (!Xstbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; - z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data); - } - } - } - // after all interleaved components, that's an interleaved MCU, - // so now count down the restart interval - if (--z->todo <= 0) { - if (z->code_bits < 24) Xstbi__grow_buffer_unsafe(z); - if (!STBI__RESTART(z->marker)) return 1; - Xstbi__jpeg_reset(z); - } - } - } - return 1; - } - } else { - if (z->scan_n == 1) { - int i,j; - int n = z->order[0]; - // non-interleaved data, we just need to process one block at a time, - // in trivial scanline order - // number of blocks to do just depends on how many actual "pixels" this - // component has, independent of interleaved MCU blocking and such - int w = (z->img_comp[n].x+7) >> 3; - int h = (z->img_comp[n].y+7) >> 3; - for (j=0; j < h; ++j) { - for (i=0; i < w; ++i) { - short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); - if (z->spec_start == 0) { - if (!Xstbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) - return 0; - } else { - int ha = z->img_comp[n].ha; - if (!Xstbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha])) - return 0; - } - // every data block is an MCU, so countdown the restart interval - if (--z->todo <= 0) { - if (z->code_bits < 24) Xstbi__grow_buffer_unsafe(z); - if (!STBI__RESTART(z->marker)) return 1; - Xstbi__jpeg_reset(z); - } - } - } - return 1; - } else { // interleaved - int i,j,k,x,y; - for (j=0; j < z->img_mcu_y; ++j) { - for (i=0; i < z->img_mcu_x; ++i) { - // scan an interleaved mcu... process scan_n components in order - for (k=0; k < z->scan_n; ++k) { - int n = z->order[k]; - // scan out an mcu's worth of this component; that's just determined - // by the basic H and V specified for the component - for (y=0; y < z->img_comp[n].v; ++y) { - for (x=0; x < z->img_comp[n].h; ++x) { - int x2 = (i*z->img_comp[n].h + x); - int y2 = (j*z->img_comp[n].v + y); - short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w); - if (!Xstbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) - return 0; - } - } - } - // after all interleaved components, that's an interleaved MCU, - // so now count down the restart interval - if (--z->todo <= 0) { - if (z->code_bits < 24) Xstbi__grow_buffer_unsafe(z); - if (!STBI__RESTART(z->marker)) return 1; - Xstbi__jpeg_reset(z); - } - } - } - return 1; - } - } -} - -static void Xstbi__jpeg_dequantize(short *data, Xstbi_uc *dequant) -{ - int i; - for (i=0; i < 64; ++i) - data[i] *= dequant[i]; -} - -static void Xstbi__jpeg_finish(Xstbi__jpeg *z) -{ - if (z->progressive) { - // dequantize and idct the data - int i,j,n; - for (n=0; n < z->s->img_n; ++n) { - int w = (z->img_comp[n].x+7) >> 3; - int h = (z->img_comp[n].y+7) >> 3; - for (j=0; j < h; ++j) { - for (i=0; i < w; ++i) { - short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); - Xstbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]); - z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); - } - } - } - } -} - -static int Xstbi__process_marker(Xstbi__jpeg *z, int m) -{ - int L; - switch (m) { - case STBI__MARKER_none: // no marker found - return Xstbi__err("expected marker","Corrupt JPEG"); - - case 0xDD: // DRI - specify restart interval - if (Xstbi__get16be(z->s) != 4) return Xstbi__err("bad DRI len","Corrupt JPEG"); - z->restart_interval = Xstbi__get16be(z->s); - return 1; - - case 0xDB: // DQT - define quantization table - L = Xstbi__get16be(z->s)-2; - while (L > 0) { - int q = Xstbi__get8(z->s); - int p = q >> 4; - int t = q & 15,i; - if (p != 0) return Xstbi__err("bad DQT type","Corrupt JPEG"); - if (t > 3) return Xstbi__err("bad DQT table","Corrupt JPEG"); - for (i=0; i < 64; ++i) - z->dequant[t][Xstbi__jpeg_dezigzag[i]] = Xstbi__get8(z->s); - L -= 65; - } - return L==0; - - case 0xC4: // DHT - define huffman table - L = Xstbi__get16be(z->s)-2; - while (L > 0) { - Xstbi_uc *v; - int sizes[16],i,n=0; - int q = Xstbi__get8(z->s); - int tc = q >> 4; - int th = q & 15; - if (tc > 1 || th > 3) return Xstbi__err("bad DHT header","Corrupt JPEG"); - for (i=0; i < 16; ++i) { - sizes[i] = Xstbi__get8(z->s); - n += sizes[i]; - } - L -= 17; - if (tc == 0) { - if (!Xstbi__build_huffman(z->huff_dc+th, sizes)) return 0; - v = z->huff_dc[th].values; - } else { - if (!Xstbi__build_huffman(z->huff_ac+th, sizes)) return 0; - v = z->huff_ac[th].values; - } - for (i=0; i < n; ++i) - v[i] = Xstbi__get8(z->s); - if (tc != 0) - Xstbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th); - L -= n; - } - return L==0; - } - // check for comment block or APP blocks - if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { - Xstbi__skip(z->s, Xstbi__get16be(z->s)-2); - return 1; - } - return 0; -} - -// after we see SOS -static int Xstbi__process_scan_header(Xstbi__jpeg *z) -{ - int i; - int Ls = Xstbi__get16be(z->s); - z->scan_n = Xstbi__get8(z->s); - if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return Xstbi__err("bad SOS component count","Corrupt JPEG"); - if (Ls != 6+2*z->scan_n) return Xstbi__err("bad SOS len","Corrupt JPEG"); - for (i=0; i < z->scan_n; ++i) { - int id = Xstbi__get8(z->s), which; - int q = Xstbi__get8(z->s); - for (which = 0; which < z->s->img_n; ++which) - if (z->img_comp[which].id == id) - break; - if (which == z->s->img_n) return 0; // no match - z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return Xstbi__err("bad DC huff","Corrupt JPEG"); - z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return Xstbi__err("bad AC huff","Corrupt JPEG"); - z->order[i] = which; - } - - { - int aa; - z->spec_start = Xstbi__get8(z->s); - z->spec_end = Xstbi__get8(z->s); // should be 63, but might be 0 - aa = Xstbi__get8(z->s); - z->succ_high = (aa >> 4); - z->succ_low = (aa & 15); - if (z->progressive) { - if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13) - return Xstbi__err("bad SOS", "Corrupt JPEG"); - } else { - if (z->spec_start != 0) return Xstbi__err("bad SOS","Corrupt JPEG"); - if (z->succ_high != 0 || z->succ_low != 0) return Xstbi__err("bad SOS","Corrupt JPEG"); - z->spec_end = 63; - } - } - - return 1; -} - -static int Xstbi__free_jpeg_components(Xstbi__jpeg *z, int ncomp, int why) -{ - int i; - for (i=0; i < ncomp; ++i) { - if (z->img_comp[i].raw_data) { - STBI_FREE(z->img_comp[i].raw_data); - z->img_comp[i].raw_data = NULL; - z->img_comp[i].data = NULL; - } - if (z->img_comp[i].raw_coeff) { - STBI_FREE(z->img_comp[i].raw_coeff); - z->img_comp[i].raw_coeff = 0; - z->img_comp[i].coeff = 0; - } - if (z->img_comp[i].linebuf) { - STBI_FREE(z->img_comp[i].linebuf); - z->img_comp[i].linebuf = NULL; - } - } - return why; -} - -static int Xstbi__process_frame_header(Xstbi__jpeg *z, int scan) -{ - Xstbi__context *s = z->s; - int Lf,p,i,q, h_max=1,v_max=1,c; - Lf = Xstbi__get16be(s); if (Lf < 11) return Xstbi__err("bad SOF len","Corrupt JPEG"); // JPEG - p = Xstbi__get8(s); if (p != 8) return Xstbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline - s->img_y = Xstbi__get16be(s); if (s->img_y == 0) return Xstbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG - s->img_x = Xstbi__get16be(s); if (s->img_x == 0) return Xstbi__err("0 width","Corrupt JPEG"); // JPEG requires - c = Xstbi__get8(s); - if (c != 3 && c != 1) return Xstbi__err("bad component count","Corrupt JPEG"); // JFIF requires - s->img_n = c; - for (i=0; i < c; ++i) { - z->img_comp[i].data = NULL; - z->img_comp[i].linebuf = NULL; - } - - if (Lf != 8+3*s->img_n) return Xstbi__err("bad SOF len","Corrupt JPEG"); - - z->rgb = 0; - for (i=0; i < s->img_n; ++i) { - static unsigned char rgb[3] = { 'R', 'G', 'B' }; - z->img_comp[i].id = Xstbi__get8(s); - if (z->img_comp[i].id != i+1) // JFIF requires - if (z->img_comp[i].id != i) { // some version of jpegtran outputs non-JFIF-compliant files! - // somethings output this (see http://fileformats.archiveteam.org/wiki/JPEG#Color_format) - if (z->img_comp[i].id != rgb[i]) - return Xstbi__err("bad component ID","Corrupt JPEG"); - ++z->rgb; - } - q = Xstbi__get8(s); - z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return Xstbi__err("bad H","Corrupt JPEG"); - z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return Xstbi__err("bad V","Corrupt JPEG"); - z->img_comp[i].tq = Xstbi__get8(s); if (z->img_comp[i].tq > 3) return Xstbi__err("bad TQ","Corrupt JPEG"); - } - - if (scan != STBI__SCAN_load) return 1; - - if (!Xstbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0)) return Xstbi__err("too large", "Image too large to decode"); - - for (i=0; i < s->img_n; ++i) { - if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h; - if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v; - } - - // compute interleaved mcu info - z->img_h_max = h_max; - z->img_v_max = v_max; - z->img_mcu_w = h_max * 8; - z->img_mcu_h = v_max * 8; - // these sizes can't be more than 17 bits - z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w; - z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h; - - for (i=0; i < s->img_n; ++i) { - // number of effective pixels (e.g. for non-interleaved MCU) - z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max; - z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max; - // to simplify generation, we'll allocate enough memory to decode - // the bogus oversized data from using interleaved MCUs and their - // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't - // discard the extra data until colorspace conversion - // - // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier) - // so these muls can't overflow with 32-bit ints (which we require) - z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8; - z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8; - z->img_comp[i].coeff = 0; - z->img_comp[i].raw_coeff = 0; - z->img_comp[i].linebuf = NULL; - z->img_comp[i].raw_data = Xstbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15); - if (z->img_comp[i].raw_data == NULL) - return Xstbi__free_jpeg_components(z, i+1, Xstbi__err("outofmem", "Out of memory")); - // align blocks for idct using mmx/sse - z->img_comp[i].data = (Xstbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15); - if (z->progressive) { - // w2, h2 are multiples of 8 (see above) - z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8; - z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8; - z->img_comp[i].raw_coeff = Xstbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15); - if (z->img_comp[i].raw_coeff == NULL) - return Xstbi__free_jpeg_components(z, i+1, Xstbi__err("outofmem", "Out of memory")); - z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15); - } - } - - return 1; -} - -// use comparisons since in some cases we handle more than one case (e.g. SOF) -#define Xstbi__DNL(x) ((x) == 0xdc) -#define Xstbi__SOI(x) ((x) == 0xd8) -#define Xstbi__EOI(x) ((x) == 0xd9) -#define Xstbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2) -#define Xstbi__SOS(x) ((x) == 0xda) - -#define Xstbi__SOF_progressive(x) ((x) == 0xc2) - -static int Xstbi__decode_jpeg_header(Xstbi__jpeg *z, int scan) -{ - int m; - z->marker = STBI__MARKER_none; // initialize cached marker to empty - m = Xstbi__get_marker(z); - if (!Xstbi__SOI(m)) return Xstbi__err("no SOI","Corrupt JPEG"); - if (scan == STBI__SCAN_type) return 1; - m = Xstbi__get_marker(z); - while (!Xstbi__SOF(m)) { - if (!Xstbi__process_marker(z,m)) return 0; - m = Xstbi__get_marker(z); - while (m == STBI__MARKER_none) { - // some files have extra padding after their blocks, so ok, we'll scan - if (Xstbi__at_eof(z->s)) return Xstbi__err("no SOF", "Corrupt JPEG"); - m = Xstbi__get_marker(z); - } - } - z->progressive = Xstbi__SOF_progressive(m); - if (!Xstbi__process_frame_header(z, scan)) return 0; - return 1; -} - -// decode image to YCbCr format -static int Xstbi__decode_jpeg_image(Xstbi__jpeg *j) -{ - int m; - for (m = 0; m < 4; m++) { - j->img_comp[m].raw_data = NULL; - j->img_comp[m].raw_coeff = NULL; - } - j->restart_interval = 0; - if (!Xstbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0; - m = Xstbi__get_marker(j); - while (!Xstbi__EOI(m)) { - if (Xstbi__SOS(m)) { - if (!Xstbi__process_scan_header(j)) return 0; - if (!Xstbi__parse_entropy_coded_data(j)) return 0; - if (j->marker == STBI__MARKER_none ) { - // handle 0s at the end of image data from IP Kamera 9060 - while (!Xstbi__at_eof(j->s)) { - int x = Xstbi__get8(j->s); - if (x == 255) { - j->marker = Xstbi__get8(j->s); - break; - } else if (x != 0) { - return Xstbi__err("junk before marker", "Corrupt JPEG"); - } - } - // if we reach eof without hitting a marker, Xstbi__get_marker() below will fail and we'll eventually return 0 - } - } else { - if (!Xstbi__process_marker(j, m)) return 0; - } - m = Xstbi__get_marker(j); - } - if (j->progressive) - Xstbi__jpeg_finish(j); - return 1; -} - -// static jfif-centered resampling (across block boundaries) - -typedef Xstbi_uc *(*resample_row_func)(Xstbi_uc *out, Xstbi_uc *in0, Xstbi_uc *in1, - int w, int hs); - -#define Xstbi__div4(x) ((Xstbi_uc) ((x) >> 2)) - -static Xstbi_uc *resample_row_1(Xstbi_uc *out, Xstbi_uc *in_near, Xstbi_uc *in_far, int w, int hs) -{ - STBI_NOTUSED(out); - STBI_NOTUSED(in_far); - STBI_NOTUSED(w); - STBI_NOTUSED(hs); - return in_near; -} - -static Xstbi_uc* Xstbi__resample_row_v_2(Xstbi_uc *out, Xstbi_uc *in_near, Xstbi_uc *in_far, int w, int hs) -{ - // need to generate two samples vertically for every one in input - int i; - STBI_NOTUSED(hs); - for (i=0; i < w; ++i) - out[i] = Xstbi__div4(3*in_near[i] + in_far[i] + 2); - return out; -} - -static Xstbi_uc* Xstbi__resample_row_h_2(Xstbi_uc *out, Xstbi_uc *in_near, Xstbi_uc *in_far, int w, int hs) -{ - // need to generate two samples horizontally for every one in input - int i; - Xstbi_uc *input = in_near; - - if (w == 1) { - // if only one sample, can't do any interpolation - out[0] = out[1] = input[0]; - return out; - } - - out[0] = input[0]; - out[1] = Xstbi__div4(input[0]*3 + input[1] + 2); - for (i=1; i < w-1; ++i) { - int n = 3*input[i]+2; - out[i*2+0] = Xstbi__div4(n+input[i-1]); - out[i*2+1] = Xstbi__div4(n+input[i+1]); - } - out[i*2+0] = Xstbi__div4(input[w-2]*3 + input[w-1] + 2); - out[i*2+1] = input[w-1]; - - STBI_NOTUSED(in_far); - STBI_NOTUSED(hs); - - return out; -} - -#define Xstbi__div16(x) ((Xstbi_uc) ((x) >> 4)) - -static Xstbi_uc *Xstbi__resample_row_hv_2(Xstbi_uc *out, Xstbi_uc *in_near, Xstbi_uc *in_far, int w, int hs) -{ - // need to generate 2x2 samples for every one in input - int i,t0,t1; - if (w == 1) { - out[0] = out[1] = Xstbi__div4(3*in_near[0] + in_far[0] + 2); - return out; - } - - t1 = 3*in_near[0] + in_far[0]; - out[0] = Xstbi__div4(t1+2); - for (i=1; i < w; ++i) { - t0 = t1; - t1 = 3*in_near[i]+in_far[i]; - out[i*2-1] = Xstbi__div16(3*t0 + t1 + 8); - out[i*2 ] = Xstbi__div16(3*t1 + t0 + 8); - } - out[w*2-1] = Xstbi__div4(t1+2); - - STBI_NOTUSED(hs); - - return out; -} - -#if defined(STBI_SSE2) || defined(STBI_NEON) -static Xstbi_uc *Xstbi__resample_row_hv_2_simd(Xstbi_uc *out, Xstbi_uc *in_near, Xstbi_uc *in_far, int w, int hs) -{ - // need to generate 2x2 samples for every one in input - int i=0,t0,t1; - - if (w == 1) { - out[0] = out[1] = Xstbi__div4(3*in_near[0] + in_far[0] + 2); - return out; - } - - t1 = 3*in_near[0] + in_far[0]; - // process groups of 8 pixels for as long as we can. - // note we can't handle the last pixel in a row in this loop - // because we need to handle the filter boundary conditions. - for (; i < ((w-1) & ~7); i += 8) { -#if defined(STBI_SSE2) - // load and perform the vertical filtering pass - // this uses 3*x + y = 4*x + (y - x) - __m128i zero = _mm_setzero_si128(); - __m128i farb = _mm_loadl_epi64((__m128i *) (in_far + i)); - __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i)); - __m128i farw = _mm_unpacklo_epi8(farb, zero); - __m128i nearw = _mm_unpacklo_epi8(nearb, zero); - __m128i diff = _mm_sub_epi16(farw, nearw); - __m128i nears = _mm_slli_epi16(nearw, 2); - __m128i curr = _mm_add_epi16(nears, diff); // current row - - // horizontal filter works the same based on shifted vers of current - // row. "prev" is current row shifted right by 1 pixel; we need to - // insert the previous pixel value (from t1). - // "next" is current row shifted left by 1 pixel, with first pixel - // of next block of 8 pixels added in. - __m128i prv0 = _mm_slli_si128(curr, 2); - __m128i nxt0 = _mm_srli_si128(curr, 2); - __m128i prev = _mm_insert_epi16(prv0, t1, 0); - __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7); - - // horizontal filter, polyphase implementation since it's convenient: - // even pixels = 3*cur + prev = cur*4 + (prev - cur) - // odd pixels = 3*cur + next = cur*4 + (next - cur) - // note the shared term. - __m128i bias = _mm_set1_epi16(8); - __m128i curs = _mm_slli_epi16(curr, 2); - __m128i prvd = _mm_sub_epi16(prev, curr); - __m128i nxtd = _mm_sub_epi16(next, curr); - __m128i curb = _mm_add_epi16(curs, bias); - __m128i even = _mm_add_epi16(prvd, curb); - __m128i odd = _mm_add_epi16(nxtd, curb); - - // interleave even and odd pixels, then undo scaling. - __m128i int0 = _mm_unpacklo_epi16(even, odd); - __m128i int1 = _mm_unpackhi_epi16(even, odd); - __m128i de0 = _mm_srli_epi16(int0, 4); - __m128i de1 = _mm_srli_epi16(int1, 4); - - // pack and write output - __m128i outv = _mm_packus_epi16(de0, de1); - _mm_storeu_si128((__m128i *) (out + i*2), outv); -#elif defined(STBI_NEON) - // load and perform the vertical filtering pass - // this uses 3*x + y = 4*x + (y - x) - uint8x8_t farb = vld1_u8(in_far + i); - uint8x8_t nearb = vld1_u8(in_near + i); - int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb)); - int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2)); - int16x8_t curr = vaddq_s16(nears, diff); // current row - - // horizontal filter works the same based on shifted vers of current - // row. "prev" is current row shifted right by 1 pixel; we need to - // insert the previous pixel value (from t1). - // "next" is current row shifted left by 1 pixel, with first pixel - // of next block of 8 pixels added in. - int16x8_t prv0 = vextq_s16(curr, curr, 7); - int16x8_t nxt0 = vextq_s16(curr, curr, 1); - int16x8_t prev = vsetq_lane_s16(t1, prv0, 0); - int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7); - - // horizontal filter, polyphase implementation since it's convenient: - // even pixels = 3*cur + prev = cur*4 + (prev - cur) - // odd pixels = 3*cur + next = cur*4 + (next - cur) - // note the shared term. - int16x8_t curs = vshlq_n_s16(curr, 2); - int16x8_t prvd = vsubq_s16(prev, curr); - int16x8_t nxtd = vsubq_s16(next, curr); - int16x8_t even = vaddq_s16(curs, prvd); - int16x8_t odd = vaddq_s16(curs, nxtd); - - // undo scaling and round, then store with even/odd phases interleaved - uint8x8x2_t o; - o.val[0] = vqrshrun_n_s16(even, 4); - o.val[1] = vqrshrun_n_s16(odd, 4); - vst2_u8(out + i*2, o); -#endif - - // "previous" value for next iter - t1 = 3*in_near[i+7] + in_far[i+7]; - } - - t0 = t1; - t1 = 3*in_near[i] + in_far[i]; - out[i*2] = Xstbi__div16(3*t1 + t0 + 8); - - for (++i; i < w; ++i) { - t0 = t1; - t1 = 3*in_near[i]+in_far[i]; - out[i*2-1] = Xstbi__div16(3*t0 + t1 + 8); - out[i*2 ] = Xstbi__div16(3*t1 + t0 + 8); - } - out[w*2-1] = Xstbi__div4(t1+2); - - STBI_NOTUSED(hs); - - return out; -} -#endif - -static Xstbi_uc *Xstbi__resample_row_generic(Xstbi_uc *out, Xstbi_uc *in_near, Xstbi_uc *in_far, int w, int hs) -{ - // resample with nearest-neighbor - int i,j; - STBI_NOTUSED(in_far); - for (i=0; i < w; ++i) - for (j=0; j < hs; ++j) - out[i*hs+j] = in_near[i]; - return out; -} - -#ifdef STBI_JPEG_OLD -// this is the same YCbCr-to-RGB calculation that stb_image has used -// historically before the algorithm changes in 1.49 -#define float2fixed(x) ((int) ((x) * 65536 + 0.5)) -static void Xstbi__YCbCr_to_RGB_row(Xstbi_uc *out, const Xstbi_uc *y, const Xstbi_uc *pcb, const Xstbi_uc *pcr, int count, int step) -{ - int i; - for (i=0; i < count; ++i) { - int y_fixed = (y[i] << 16) + 32768; // rounding - int r,g,b; - int cr = pcr[i] - 128; - int cb = pcb[i] - 128; - r = y_fixed + cr*float2fixed(1.40200f); - g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f); - b = y_fixed + cb*float2fixed(1.77200f); - r >>= 16; - g >>= 16; - b >>= 16; - if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } - if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } - if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } - out[0] = (Xstbi_uc)r; - out[1] = (Xstbi_uc)g; - out[2] = (Xstbi_uc)b; - out[3] = 255; - out += step; - } -} -#else -// this is a reduced-precision calculation of YCbCr-to-RGB introduced -// to make sure the code produces the same results in both SIMD and scalar -#define float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8) -static void Xstbi__YCbCr_to_RGB_row(Xstbi_uc *out, const Xstbi_uc *y, const Xstbi_uc *pcb, const Xstbi_uc *pcr, int count, int step) -{ - int i; - for (i=0; i < count; ++i) { - int y_fixed = (y[i] << 20) + (1<<19); // rounding - int r,g,b; - int cr = pcr[i] - 128; - int cb = pcb[i] - 128; - r = y_fixed + cr* float2fixed(1.40200f); - g = y_fixed + (cr*-float2fixed(0.71414f)) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); - b = y_fixed + cb* float2fixed(1.77200f); - r >>= 20; - g >>= 20; - b >>= 20; - if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } - if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } - if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } - out[0] = (Xstbi_uc)r; - out[1] = (Xstbi_uc)g; - out[2] = (Xstbi_uc)b; - out[3] = 255; - out += step; - } -} -#endif - -#if defined(STBI_SSE2) || defined(STBI_NEON) -static void Xstbi__YCbCr_to_RGB_simd(Xstbi_uc *out, Xstbi_uc const *y, Xstbi_uc const *pcb, Xstbi_uc const *pcr, int count, int step) -{ - int i = 0; - -#ifdef STBI_SSE2 - // step == 3 is pretty ugly on the final interleave, and i'm not convinced - // it's useful in practice (you wouldn't use it for textures, for example). - // so just accelerate step == 4 case. - if (step == 4) { - // this is a fairly straightforward implementation and not super-optimized. - __m128i signflip = _mm_set1_epi8(-0x80); - __m128i cr_const0 = _mm_set1_epi16( (short) ( 1.40200f*4096.0f+0.5f)); - __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f)); - __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f)); - __m128i cb_const1 = _mm_set1_epi16( (short) ( 1.77200f*4096.0f+0.5f)); - __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128); - __m128i xw = _mm_set1_epi16(255); // alpha channel - - for (; i+7 < count; i += 8) { - // load - __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i)); - __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i)); - __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i)); - __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128 - __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128 - - // unpack to short (and left-shift cr, cb by 8) - __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes); - __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased); - __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased); - - // color transform - __m128i yws = _mm_srli_epi16(yw, 4); - __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw); - __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw); - __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1); - __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1); - __m128i rws = _mm_add_epi16(cr0, yws); - __m128i gwt = _mm_add_epi16(cb0, yws); - __m128i bws = _mm_add_epi16(yws, cb1); - __m128i gws = _mm_add_epi16(gwt, cr1); - - // descale - __m128i rw = _mm_srai_epi16(rws, 4); - __m128i bw = _mm_srai_epi16(bws, 4); - __m128i gw = _mm_srai_epi16(gws, 4); - - // back to byte, set up for transpose - __m128i brb = _mm_packus_epi16(rw, bw); - __m128i gxb = _mm_packus_epi16(gw, xw); - - // transpose to interleave channels - __m128i t0 = _mm_unpacklo_epi8(brb, gxb); - __m128i t1 = _mm_unpackhi_epi8(brb, gxb); - __m128i o0 = _mm_unpacklo_epi16(t0, t1); - __m128i o1 = _mm_unpackhi_epi16(t0, t1); - - // store - _mm_storeu_si128((__m128i *) (out + 0), o0); - _mm_storeu_si128((__m128i *) (out + 16), o1); - out += 32; - } - } -#endif - -#ifdef STBI_NEON - // in this version, step=3 support would be easy to add. but is there demand? - if (step == 4) { - // this is a fairly straightforward implementation and not super-optimized. - uint8x8_t signflip = vdup_n_u8(0x80); - int16x8_t cr_const0 = vdupq_n_s16( (short) ( 1.40200f*4096.0f+0.5f)); - int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f)); - int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f)); - int16x8_t cb_const1 = vdupq_n_s16( (short) ( 1.77200f*4096.0f+0.5f)); - - for (; i+7 < count; i += 8) { - // load - uint8x8_t y_bytes = vld1_u8(y + i); - uint8x8_t cr_bytes = vld1_u8(pcr + i); - uint8x8_t cb_bytes = vld1_u8(pcb + i); - int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip)); - int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip)); - - // expand to s16 - int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4)); - int16x8_t crw = vshll_n_s8(cr_biased, 7); - int16x8_t cbw = vshll_n_s8(cb_biased, 7); - - // color transform - int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0); - int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0); - int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1); - int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1); - int16x8_t rws = vaddq_s16(yws, cr0); - int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1); - int16x8_t bws = vaddq_s16(yws, cb1); - - // undo scaling, round, convert to byte - uint8x8x4_t o; - o.val[0] = vqrshrun_n_s16(rws, 4); - o.val[1] = vqrshrun_n_s16(gws, 4); - o.val[2] = vqrshrun_n_s16(bws, 4); - o.val[3] = vdup_n_u8(255); - - // store, interleaving r/g/b/a - vst4_u8(out, o); - out += 8*4; - } - } -#endif - - for (; i < count; ++i) { - int y_fixed = (y[i] << 20) + (1<<19); // rounding - int r,g,b; - int cr = pcr[i] - 128; - int cb = pcb[i] - 128; - r = y_fixed + cr* float2fixed(1.40200f); - g = y_fixed + cr*-float2fixed(0.71414f) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); - b = y_fixed + cb* float2fixed(1.77200f); - r >>= 20; - g >>= 20; - b >>= 20; - if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } - if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } - if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } - out[0] = (Xstbi_uc)r; - out[1] = (Xstbi_uc)g; - out[2] = (Xstbi_uc)b; - out[3] = 255; - out += step; - } -} -#endif - -// set up the kernels -static void Xstbi__setup_jpeg(Xstbi__jpeg *j) -{ - j->idct_block_kernel = Xstbi__idct_block; - j->YCbCr_to_RGB_kernel = Xstbi__YCbCr_to_RGB_row; - j->resample_row_hv_2_kernel = Xstbi__resample_row_hv_2; - -#ifdef STBI_SSE2 - if (Xstbi__sse2_available()) { - j->idct_block_kernel = Xstbi__idct_simd; - #ifndef STBI_JPEG_OLD - j->YCbCr_to_RGB_kernel = Xstbi__YCbCr_to_RGB_simd; - #endif - j->resample_row_hv_2_kernel = Xstbi__resample_row_hv_2_simd; - } -#endif - -#ifdef STBI_NEON - j->idct_block_kernel = Xstbi__idct_simd; - #ifndef STBI_JPEG_OLD - j->YCbCr_to_RGB_kernel = Xstbi__YCbCr_to_RGB_simd; - #endif - j->resample_row_hv_2_kernel = Xstbi__resample_row_hv_2_simd; -#endif -} - -// clean up the temporary component buffers -static void Xstbi__cleanup_jpeg(Xstbi__jpeg *j) -{ - Xstbi__free_jpeg_components(j, j->s->img_n, 0); -} - -typedef struct -{ - resample_row_func resample; - Xstbi_uc *line0,*line1; - int hs,vs; // expansion factor in each axis - int w_lores; // horizontal pixels pre-expansion - int ystep; // how far through vertical expansion we are - int ypos; // which pre-expansion row we're on -} Xstbi__resample; - -static Xstbi_uc *load_jpeg_image(Xstbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) -{ - int n, decode_n; - z->s->img_n = 0; // make Xstbi__cleanup_jpeg safe - - // validate req_comp - if (req_comp < 0 || req_comp > 4) return Xstbi__errpuc("bad req_comp", "Internal error"); - - // load a jpeg image from whichever source, but leave in YCbCr format - if (!Xstbi__decode_jpeg_image(z)) { Xstbi__cleanup_jpeg(z); return NULL; } - - // determine actual number of components to generate - n = req_comp ? req_comp : z->s->img_n; - - if (z->s->img_n == 3 && n < 3) - decode_n = 1; - else - decode_n = z->s->img_n; - - // resample and color-convert - { - int k; - unsigned int i,j; - Xstbi_uc *output; - Xstbi_uc *coutput[4]; - - Xstbi__resample res_comp[4]; - - for (k=0; k < decode_n; ++k) { - Xstbi__resample *r = &res_comp[k]; - - // allocate line buffer big enough for upsampling off the edges - // with upsample factor of 4 - z->img_comp[k].linebuf = (Xstbi_uc *) Xstbi__malloc(z->s->img_x + 3); - if (!z->img_comp[k].linebuf) { Xstbi__cleanup_jpeg(z); return Xstbi__errpuc("outofmem", "Out of memory"); } - - r->hs = z->img_h_max / z->img_comp[k].h; - r->vs = z->img_v_max / z->img_comp[k].v; - r->ystep = r->vs >> 1; - r->w_lores = (z->s->img_x + r->hs-1) / r->hs; - r->ypos = 0; - r->line0 = r->line1 = z->img_comp[k].data; - - if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1; - else if (r->hs == 1 && r->vs == 2) r->resample = Xstbi__resample_row_v_2; - else if (r->hs == 2 && r->vs == 1) r->resample = Xstbi__resample_row_h_2; - else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel; - else r->resample = Xstbi__resample_row_generic; - } - - // can't error after this so, this is safe - output = (Xstbi_uc *) Xstbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1); - if (!output) { Xstbi__cleanup_jpeg(z); return Xstbi__errpuc("outofmem", "Out of memory"); } - - // now go ahead and resample - for (j=0; j < z->s->img_y; ++j) { - Xstbi_uc *out = output + n * z->s->img_x * j; - for (k=0; k < decode_n; ++k) { - Xstbi__resample *r = &res_comp[k]; - int y_bot = r->ystep >= (r->vs >> 1); - coutput[k] = r->resample(z->img_comp[k].linebuf, - y_bot ? r->line1 : r->line0, - y_bot ? r->line0 : r->line1, - r->w_lores, r->hs); - if (++r->ystep >= r->vs) { - r->ystep = 0; - r->line0 = r->line1; - if (++r->ypos < z->img_comp[k].y) - r->line1 += z->img_comp[k].w2; - } - } - if (n >= 3) { - Xstbi_uc *y = coutput[0]; - if (z->s->img_n == 3) { - if (z->rgb == 3) { - for (i=0; i < z->s->img_x; ++i) { - out[0] = y[i]; - out[1] = coutput[1][i]; - out[2] = coutput[2][i]; - out[3] = 255; - out += n; - } - } else { - z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); - } - } else - for (i=0; i < z->s->img_x; ++i) { - out[0] = out[1] = out[2] = y[i]; - out[3] = 255; // not used if n==3 - out += n; - } - } else { - Xstbi_uc *y = coutput[0]; - if (n == 1) - for (i=0; i < z->s->img_x; ++i) out[i] = y[i]; - else - for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255; - } - } - Xstbi__cleanup_jpeg(z); - *out_x = z->s->img_x; - *out_y = z->s->img_y; - if (comp) *comp = z->s->img_n; // report original components, not output - return output; - } -} - -static void *Xstbi__jpeg_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri) -{ - unsigned char* result; - Xstbi__jpeg* j = (Xstbi__jpeg*) Xstbi__malloc(sizeof(Xstbi__jpeg)); - j->s = s; - Xstbi__setup_jpeg(j); - result = load_jpeg_image(j, x,y,comp,req_comp); - STBI_FREE(j); - return result; -} - -static int Xstbi__jpeg_test(Xstbi__context *s) -{ - int r; - Xstbi__jpeg j; - j.s = s; - Xstbi__setup_jpeg(&j); - r = Xstbi__decode_jpeg_header(&j, STBI__SCAN_type); - Xstbi__rewind(s); - return r; -} - -static int Xstbi__jpeg_info_raw(Xstbi__jpeg *j, int *x, int *y, int *comp) -{ - if (!Xstbi__decode_jpeg_header(j, STBI__SCAN_header)) { - Xstbi__rewind( j->s ); - return 0; - } - if (x) *x = j->s->img_x; - if (y) *y = j->s->img_y; - if (comp) *comp = j->s->img_n; - return 1; -} - -static int Xstbi__jpeg_info(Xstbi__context *s, int *x, int *y, int *comp) -{ - int result; - Xstbi__jpeg* j = (Xstbi__jpeg*) (Xstbi__malloc(sizeof(Xstbi__jpeg))); - j->s = s; - result = Xstbi__jpeg_info_raw(j, x, y, comp); - STBI_FREE(j); - return result; -} -#endif - -// public domain zlib decode v0.2 Sean Barrett 2006-11-18 -// simple implementation -// - all input must be provided in an upfront buffer -// - all output is written to a single output buffer (can malloc/realloc) -// performance -// - fast huffman - -#ifndef STBI_NO_ZLIB - -// fast-way is faster to check than jpeg huffman, but slow way is slower -#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables -#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1) - -// zlib-style huffman encoding -// (jpegs packs from left, zlib from right, so can't share code) -typedef struct -{ - Xstbi__uint16 fast[1 << STBI__ZFAST_BITS]; - Xstbi__uint16 firstcode[16]; - int maxcode[17]; - Xstbi__uint16 firstsymbol[16]; - Xstbi_uc size[288]; - Xstbi__uint16 value[288]; -} Xstbi__zhuffman; - -Xstbi_inline static int Xstbi__bitreverse16(int n) -{ - n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); - n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); - n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); - n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); - return n; -} - -Xstbi_inline static int Xstbi__bit_reverse(int v, int bits) -{ - STBI_ASSERT(bits <= 16); - // to bit reverse n bits, reverse 16 and shift - // e.g. 11 bits, bit reverse and shift away 5 - return Xstbi__bitreverse16(v) >> (16-bits); -} - -static int Xstbi__zbuild_huffman(Xstbi__zhuffman *z, Xstbi_uc *sizelist, int num) -{ - int i,k=0; - int code, next_code[16], sizes[17]; - - // DEFLATE spec for generating codes - memset(sizes, 0, sizeof(sizes)); - memset(z->fast, 0, sizeof(z->fast)); - for (i=0; i < num; ++i) - ++sizes[sizelist[i]]; - sizes[0] = 0; - for (i=1; i < 16; ++i) - if (sizes[i] > (1 << i)) - return Xstbi__err("bad sizes", "Corrupt PNG"); - code = 0; - for (i=1; i < 16; ++i) { - next_code[i] = code; - z->firstcode[i] = (Xstbi__uint16) code; - z->firstsymbol[i] = (Xstbi__uint16) k; - code = (code + sizes[i]); - if (sizes[i]) - if (code-1 >= (1 << i)) return Xstbi__err("bad codelengths","Corrupt PNG"); - z->maxcode[i] = code << (16-i); // preshift for inner loop - code <<= 1; - k += sizes[i]; - } - z->maxcode[16] = 0x10000; // sentinel - for (i=0; i < num; ++i) { - int s = sizelist[i]; - if (s) { - int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; - Xstbi__uint16 fastv = (Xstbi__uint16) ((s << 9) | i); - z->size [c] = (Xstbi_uc ) s; - z->value[c] = (Xstbi__uint16) i; - if (s <= STBI__ZFAST_BITS) { - int j = Xstbi__bit_reverse(next_code[s],s); - while (j < (1 << STBI__ZFAST_BITS)) { - z->fast[j] = fastv; - j += (1 << s); - } - } - ++next_code[s]; - } - } - return 1; -} - -// zlib-from-memory implementation for PNG reading -// because PNG allows splitting the zlib stream arbitrarily, -// and it's annoying structurally to have PNG call ZLIB call PNG, -// we require PNG read all the IDATs and combine them into a single -// memory buffer - -typedef struct -{ - Xstbi_uc *zbuffer, *zbuffer_end; - int num_bits; - Xstbi__uint32 code_buffer; - - char *zout; - char *zout_start; - char *zout_end; - int z_expandable; - - Xstbi__zhuffman z_length, z_distance; -} Xstbi__zbuf; - -Xstbi_inline static Xstbi_uc Xstbi__zget8(Xstbi__zbuf *z) -{ - if (z->zbuffer >= z->zbuffer_end) return 0; - return *z->zbuffer++; -} - -static void Xstbi__fill_bits(Xstbi__zbuf *z) -{ - do { - STBI_ASSERT(z->code_buffer < (1U << z->num_bits)); - z->code_buffer |= (unsigned int) Xstbi__zget8(z) << z->num_bits; - z->num_bits += 8; - } while (z->num_bits <= 24); -} - -Xstbi_inline static unsigned int Xstbi__zreceive(Xstbi__zbuf *z, int n) -{ - unsigned int k; - if (z->num_bits < n) Xstbi__fill_bits(z); - k = z->code_buffer & ((1 << n) - 1); - z->code_buffer >>= n; - z->num_bits -= n; - return k; -} - -static int Xstbi__zhuffman_decode_slowpath(Xstbi__zbuf *a, Xstbi__zhuffman *z) -{ - int b,s,k; - // not resolved by fast table, so compute it the slow way - // use jpeg approach, which requires MSbits at top - k = Xstbi__bit_reverse(a->code_buffer, 16); - for (s=STBI__ZFAST_BITS+1; ; ++s) - if (k < z->maxcode[s]) - break; - if (s == 16) return -1; // invalid code! - // code size is s, so: - b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s]; - STBI_ASSERT(z->size[b] == s); - a->code_buffer >>= s; - a->num_bits -= s; - return z->value[b]; -} - -Xstbi_inline static int Xstbi__zhuffman_decode(Xstbi__zbuf *a, Xstbi__zhuffman *z) -{ - int b,s; - if (a->num_bits < 16) Xstbi__fill_bits(a); - b = z->fast[a->code_buffer & STBI__ZFAST_MASK]; - if (b) { - s = b >> 9; - a->code_buffer >>= s; - a->num_bits -= s; - return b & 511; - } - return Xstbi__zhuffman_decode_slowpath(a, z); -} - -static int Xstbi__zexpand(Xstbi__zbuf *z, char *zout, int n) // need to make room for n bytes -{ - char *q; - int cur, limit, old_limit; - z->zout = zout; - if (!z->z_expandable) return Xstbi__err("output buffer limit","Corrupt PNG"); - cur = (int) (z->zout - z->zout_start); - limit = old_limit = (int) (z->zout_end - z->zout_start); - while (cur + n > limit) - limit *= 2; - q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit); - STBI_NOTUSED(old_limit); - if (q == NULL) return Xstbi__err("outofmem", "Out of memory"); - z->zout_start = q; - z->zout = q + cur; - z->zout_end = q + limit; - return 1; -} - -static int Xstbi__zlength_base[31] = { - 3,4,5,6,7,8,9,10,11,13, - 15,17,19,23,27,31,35,43,51,59, - 67,83,99,115,131,163,195,227,258,0,0 }; - -static int Xstbi__zlength_extra[31]= -{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; - -static int Xstbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, -257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; - -static int Xstbi__zdist_extra[32] = -{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; - -static int Xstbi__parse_huffman_block(Xstbi__zbuf *a) -{ - char *zout = a->zout; - for(;;) { - int z = Xstbi__zhuffman_decode(a, &a->z_length); - if (z < 256) { - if (z < 0) return Xstbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes - if (zout >= a->zout_end) { - if (!Xstbi__zexpand(a, zout, 1)) return 0; - zout = a->zout; - } - *zout++ = (char) z; - } else { - Xstbi_uc *p; - int len,dist; - if (z == 256) { - a->zout = zout; - return 1; - } - z -= 257; - len = Xstbi__zlength_base[z]; - if (Xstbi__zlength_extra[z]) len += Xstbi__zreceive(a, Xstbi__zlength_extra[z]); - z = Xstbi__zhuffman_decode(a, &a->z_distance); - if (z < 0) return Xstbi__err("bad huffman code","Corrupt PNG"); - dist = Xstbi__zdist_base[z]; - if (Xstbi__zdist_extra[z]) dist += Xstbi__zreceive(a, Xstbi__zdist_extra[z]); - if (zout - a->zout_start < dist) return Xstbi__err("bad dist","Corrupt PNG"); - if (zout + len > a->zout_end) { - if (!Xstbi__zexpand(a, zout, len)) return 0; - zout = a->zout; - } - p = (Xstbi_uc *) (zout - dist); - if (dist == 1) { // run of one byte; common in images. - Xstbi_uc v = *p; - if (len) { do *zout++ = v; while (--len); } - } else { - if (len) { do *zout++ = *p++; while (--len); } - } - } - } -} - -static int Xstbi__compute_huffman_codes(Xstbi__zbuf *a) -{ - static Xstbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; - Xstbi__zhuffman z_codelength; - Xstbi_uc lencodes[286+32+137];//padding for maximum single op - Xstbi_uc codelength_sizes[19]; - int i,n; - - int hlit = Xstbi__zreceive(a,5) + 257; - int hdist = Xstbi__zreceive(a,5) + 1; - int hclen = Xstbi__zreceive(a,4) + 4; - int ntot = hlit + hdist; - - memset(codelength_sizes, 0, sizeof(codelength_sizes)); - for (i=0; i < hclen; ++i) { - int s = Xstbi__zreceive(a,3); - codelength_sizes[length_dezigzag[i]] = (Xstbi_uc) s; - } - if (!Xstbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0; - - n = 0; - while (n < ntot) { - int c = Xstbi__zhuffman_decode(a, &z_codelength); - if (c < 0 || c >= 19) return Xstbi__err("bad codelengths", "Corrupt PNG"); - if (c < 16) - lencodes[n++] = (Xstbi_uc) c; - else { - Xstbi_uc fill = 0; - if (c == 16) { - c = Xstbi__zreceive(a,2)+3; - if (n == 0) return Xstbi__err("bad codelengths", "Corrupt PNG"); - fill = lencodes[n-1]; - } else if (c == 17) - c = Xstbi__zreceive(a,3)+3; - else { - STBI_ASSERT(c == 18); - c = Xstbi__zreceive(a,7)+11; - } - if (ntot - n < c) return Xstbi__err("bad codelengths", "Corrupt PNG"); - memset(lencodes+n, fill, c); - n += c; - } - } - if (n != ntot) return Xstbi__err("bad codelengths","Corrupt PNG"); - if (!Xstbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0; - if (!Xstbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0; - return 1; -} - -static int Xstbi__parse_uncompressed_block(Xstbi__zbuf *a) -{ - Xstbi_uc header[4]; - int len,nlen,k; - if (a->num_bits & 7) - Xstbi__zreceive(a, a->num_bits & 7); // discard - // drain the bit-packed data into header - k = 0; - while (a->num_bits > 0) { - header[k++] = (Xstbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check - a->code_buffer >>= 8; - a->num_bits -= 8; - } - STBI_ASSERT(a->num_bits == 0); - // now fill header the normal way - while (k < 4) - header[k++] = Xstbi__zget8(a); - len = header[1] * 256 + header[0]; - nlen = header[3] * 256 + header[2]; - if (nlen != (len ^ 0xffff)) return Xstbi__err("zlib corrupt","Corrupt PNG"); - if (a->zbuffer + len > a->zbuffer_end) return Xstbi__err("read past buffer","Corrupt PNG"); - if (a->zout + len > a->zout_end) - if (!Xstbi__zexpand(a, a->zout, len)) return 0; - memcpy(a->zout, a->zbuffer, len); - a->zbuffer += len; - a->zout += len; - return 1; -} - -static int Xstbi__parse_zlib_header(Xstbi__zbuf *a) -{ - int cmf = Xstbi__zget8(a); - int cm = cmf & 15; - /* int cinfo = cmf >> 4; */ - int flg = Xstbi__zget8(a); - if ((cmf*256+flg) % 31 != 0) return Xstbi__err("bad zlib header","Corrupt PNG"); // zlib spec - if (flg & 32) return Xstbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png - if (cm != 8) return Xstbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png - // window = 1 << (8 + cinfo)... but who cares, we fully buffer output - return 1; -} - -// @TODO: should statically initialize these for optimal thread safety -static Xstbi_uc Xstbi__zdefault_length[288], Xstbi__zdefault_distance[32]; -static void Xstbi__init_zdefaults(void) -{ - int i; // use <= to match clearly with spec - for (i=0; i <= 143; ++i) Xstbi__zdefault_length[i] = 8; - for ( ; i <= 255; ++i) Xstbi__zdefault_length[i] = 9; - for ( ; i <= 279; ++i) Xstbi__zdefault_length[i] = 7; - for ( ; i <= 287; ++i) Xstbi__zdefault_length[i] = 8; - - for (i=0; i <= 31; ++i) Xstbi__zdefault_distance[i] = 5; -} - -static int Xstbi__parse_zlib(Xstbi__zbuf *a, int parse_header) -{ - int final, type; - if (parse_header) - if (!Xstbi__parse_zlib_header(a)) return 0; - a->num_bits = 0; - a->code_buffer = 0; - do { - final = Xstbi__zreceive(a,1); - type = Xstbi__zreceive(a,2); - if (type == 0) { - if (!Xstbi__parse_uncompressed_block(a)) return 0; - } else if (type == 3) { - return 0; - } else { - if (type == 1) { - // use fixed code lengths - if (!Xstbi__zdefault_distance[31]) Xstbi__init_zdefaults(); - if (!Xstbi__zbuild_huffman(&a->z_length , Xstbi__zdefault_length , 288)) return 0; - if (!Xstbi__zbuild_huffman(&a->z_distance, Xstbi__zdefault_distance, 32)) return 0; - } else { - if (!Xstbi__compute_huffman_codes(a)) return 0; - } - if (!Xstbi__parse_huffman_block(a)) return 0; - } - } while (!final); - return 1; -} - -static int Xstbi__do_zlib(Xstbi__zbuf *a, char *obuf, int olen, int exp, int parse_header) -{ - a->zout_start = obuf; - a->zout = obuf; - a->zout_end = obuf + olen; - a->z_expandable = exp; - - return Xstbi__parse_zlib(a, parse_header); -} - -STBIDEF char *Xstbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen) -{ - Xstbi__zbuf a; - char *p = (char *) Xstbi__malloc(initial_size); - if (p == NULL) return NULL; - a.zbuffer = (Xstbi_uc *) buffer; - a.zbuffer_end = (Xstbi_uc *) buffer + len; - if (Xstbi__do_zlib(&a, p, initial_size, 1, 1)) { - if (outlen) *outlen = (int) (a.zout - a.zout_start); - return a.zout_start; - } else { - STBI_FREE(a.zout_start); - return NULL; - } -} - -STBIDEF char *Xstbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) -{ - return Xstbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen); -} - -STBIDEF char *Xstbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header) -{ - Xstbi__zbuf a; - char *p = (char *) Xstbi__malloc(initial_size); - if (p == NULL) return NULL; - a.zbuffer = (Xstbi_uc *) buffer; - a.zbuffer_end = (Xstbi_uc *) buffer + len; - if (Xstbi__do_zlib(&a, p, initial_size, 1, parse_header)) { - if (outlen) *outlen = (int) (a.zout - a.zout_start); - return a.zout_start; - } else { - STBI_FREE(a.zout_start); - return NULL; - } -} - -STBIDEF int Xstbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) -{ - Xstbi__zbuf a; - a.zbuffer = (Xstbi_uc *) ibuffer; - a.zbuffer_end = (Xstbi_uc *) ibuffer + ilen; - if (Xstbi__do_zlib(&a, obuffer, olen, 0, 1)) - return (int) (a.zout - a.zout_start); - else - return -1; -} - -STBIDEF char *Xstbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) -{ - Xstbi__zbuf a; - char *p = (char *) Xstbi__malloc(16384); - if (p == NULL) return NULL; - a.zbuffer = (Xstbi_uc *) buffer; - a.zbuffer_end = (Xstbi_uc *) buffer+len; - if (Xstbi__do_zlib(&a, p, 16384, 1, 0)) { - if (outlen) *outlen = (int) (a.zout - a.zout_start); - return a.zout_start; - } else { - STBI_FREE(a.zout_start); - return NULL; - } -} - -STBIDEF int Xstbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen) -{ - Xstbi__zbuf a; - a.zbuffer = (Xstbi_uc *) ibuffer; - a.zbuffer_end = (Xstbi_uc *) ibuffer + ilen; - if (Xstbi__do_zlib(&a, obuffer, olen, 0, 0)) - return (int) (a.zout - a.zout_start); - else - return -1; -} -#endif - -// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18 -// simple implementation -// - only 8-bit samples -// - no CRC checking -// - allocates lots of intermediate memory -// - avoids problem of streaming data between subsystems -// - avoids explicit window management -// performance -// - uses stb_zlib, a PD zlib implementation with fast huffman decoding - -#ifndef STBI_NO_PNG -typedef struct -{ - Xstbi__uint32 length; - Xstbi__uint32 type; -} Xstbi__pngchunk; - -static Xstbi__pngchunk Xstbi__get_chunk_header(Xstbi__context *s) -{ - Xstbi__pngchunk c; - c.length = Xstbi__get32be(s); - c.type = Xstbi__get32be(s); - return c; -} - -static int Xstbi__check_png_header(Xstbi__context *s) -{ - static Xstbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 }; - int i; - for (i=0; i < 8; ++i) - if (Xstbi__get8(s) != png_sig[i]) return Xstbi__err("bad png sig","Not a PNG"); - return 1; -} - -typedef struct -{ - Xstbi__context *s; - Xstbi_uc *idata, *expanded, *out; - int depth; -} Xstbi__png; - - -enum { - STBI__F_none=0, - STBI__F_sub=1, - STBI__F_up=2, - STBI__F_avg=3, - STBI__F_paeth=4, - // synthetic filters used for first scanline to avoid needing a dummy row of 0s - STBI__F_avg_first, - STBI__F_paeth_first -}; - -static Xstbi_uc first_row_filter[5] = -{ - STBI__F_none, - STBI__F_sub, - STBI__F_none, - STBI__F_avg_first, - STBI__F_paeth_first -}; - -static int Xstbi__paeth(int a, int b, int c) -{ - int p = a + b - c; - int pa = abs(p-a); - int pb = abs(p-b); - int pc = abs(p-c); - if (pa <= pb && pa <= pc) return a; - if (pb <= pc) return b; - return c; -} - -static Xstbi_uc Xstbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 }; - -// create the png data from post-deflated data -static int Xstbi__create_png_image_raw(Xstbi__png *a, Xstbi_uc *raw, Xstbi__uint32 raw_len, int out_n, Xstbi__uint32 x, Xstbi__uint32 y, int depth, int color) -{ - int bytes = (depth == 16? 2 : 1); - Xstbi__context *s = a->s; - Xstbi__uint32 i,j,stride = x*out_n*bytes; - Xstbi__uint32 img_len, img_width_bytes; - int k; - int img_n = s->img_n; // copy it into a local for later - - int output_bytes = out_n*bytes; - int filter_bytes = img_n*bytes; - int width = x; - - STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1); - a->out = (Xstbi_uc *) Xstbi__malloc_mad3(x, y, output_bytes, 0); // extra bytes to write off the end into - if (!a->out) return Xstbi__err("outofmem", "Out of memory"); - - img_width_bytes = (((img_n * x * depth) + 7) >> 3); - img_len = (img_width_bytes + 1) * y; - if (s->img_x == x && s->img_y == y) { - if (raw_len != img_len) return Xstbi__err("not enough pixels","Corrupt PNG"); - } else { // interlaced: - if (raw_len < img_len) return Xstbi__err("not enough pixels","Corrupt PNG"); - } - - for (j=0; j < y; ++j) { - Xstbi_uc *cur = a->out + stride*j; - Xstbi_uc *prior = cur - stride; - int filter = *raw++; - - if (filter > 4) - return Xstbi__err("invalid filter","Corrupt PNG"); - - if (depth < 8) { - STBI_ASSERT(img_width_bytes <= x); - cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place - filter_bytes = 1; - width = img_width_bytes; - } - - // if first row, use special filter that doesn't sample previous row - if (j == 0) filter = first_row_filter[filter]; - - // handle first byte explicitly - for (k=0; k < filter_bytes; ++k) { - switch (filter) { - case STBI__F_none : cur[k] = raw[k]; break; - case STBI__F_sub : cur[k] = raw[k]; break; - case STBI__F_up : cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break; - case STBI__F_avg : cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); break; - case STBI__F_paeth : cur[k] = STBI__BYTECAST(raw[k] + Xstbi__paeth(0,prior[k],0)); break; - case STBI__F_avg_first : cur[k] = raw[k]; break; - case STBI__F_paeth_first: cur[k] = raw[k]; break; - } - } - - if (depth == 8) { - if (img_n != out_n) - cur[img_n] = 255; // first pixel - raw += img_n; - cur += out_n; - prior += out_n; - } else if (depth == 16) { - if (img_n != out_n) { - cur[filter_bytes] = 255; // first pixel top byte - cur[filter_bytes+1] = 255; // first pixel bottom byte - } - raw += filter_bytes; - cur += output_bytes; - prior += output_bytes; - } else { - raw += 1; - cur += 1; - prior += 1; - } - - // this is a little gross, so that we don't switch per-pixel or per-component - if (depth < 8 || img_n == out_n) { - int nk = (width - 1)*filter_bytes; - #define STBI__CASE(f) \ - case f: \ - for (k=0; k < nk; ++k) - switch (filter) { - // "none" filter turns into a memcpy here; make that explicit. - case STBI__F_none: memcpy(cur, raw, nk); break; - STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); } break; - STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break; - STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); } break; - STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + Xstbi__paeth(cur[k-filter_bytes],prior[k],prior[k-filter_bytes])); } break; - STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); } break; - STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + Xstbi__paeth(cur[k-filter_bytes],0,0)); } break; - } - #undef STBI__CASE - raw += nk; - } else { - STBI_ASSERT(img_n+1 == out_n); - #define STBI__CASE(f) \ - case f: \ - for (i=x-1; i >= 1; --i, cur[filter_bytes]=255,raw+=filter_bytes,cur+=output_bytes,prior+=output_bytes) \ - for (k=0; k < filter_bytes; ++k) - switch (filter) { - STBI__CASE(STBI__F_none) { cur[k] = raw[k]; } break; - STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k- output_bytes]); } break; - STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break; - STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k- output_bytes])>>1)); } break; - STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + Xstbi__paeth(cur[k- output_bytes],prior[k],prior[k- output_bytes])); } break; - STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k- output_bytes] >> 1)); } break; - STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + Xstbi__paeth(cur[k- output_bytes],0,0)); } break; - } - #undef STBI__CASE - - // the loop above sets the high byte of the pixels' alpha, but for - // 16 bit png files we also need the low byte set. we'll do that here. - if (depth == 16) { - cur = a->out + stride*j; // start at the beginning of the row again - for (i=0; i < x; ++i,cur+=output_bytes) { - cur[filter_bytes+1] = 255; - } - } - } - } - - // we make a separate pass to expand bits to pixels; for performance, - // this could run two scanlines behind the above code, so it won't - // intefere with filtering but will still be in the cache. - if (depth < 8) { - for (j=0; j < y; ++j) { - Xstbi_uc *cur = a->out + stride*j; - Xstbi_uc *in = a->out + stride*j + x*out_n - img_width_bytes; - // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the common 8-bit path optimal at minimal cost for 1/2/4-bit - // png guarante byte alignment, if width is not multiple of 8/4/2 we'll decode dummy trailing data that will be skipped in the later loop - Xstbi_uc scale = (color == 0) ? Xstbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range - - // note that the final byte might overshoot and write more data than desired. - // we can allocate enough data that this never writes out of memory, but it - // could also overwrite the next scanline. can it overwrite non-empty data - // on the next scanline? yes, consider 1-pixel-wide scanlines with 1-bit-per-pixel. - // so we need to explicitly clamp the final ones - - if (depth == 4) { - for (k=x*img_n; k >= 2; k-=2, ++in) { - *cur++ = scale * ((*in >> 4) ); - *cur++ = scale * ((*in ) & 0x0f); - } - if (k > 0) *cur++ = scale * ((*in >> 4) ); - } else if (depth == 2) { - for (k=x*img_n; k >= 4; k-=4, ++in) { - *cur++ = scale * ((*in >> 6) ); - *cur++ = scale * ((*in >> 4) & 0x03); - *cur++ = scale * ((*in >> 2) & 0x03); - *cur++ = scale * ((*in ) & 0x03); - } - if (k > 0) *cur++ = scale * ((*in >> 6) ); - if (k > 1) *cur++ = scale * ((*in >> 4) & 0x03); - if (k > 2) *cur++ = scale * ((*in >> 2) & 0x03); - } else if (depth == 1) { - for (k=x*img_n; k >= 8; k-=8, ++in) { - *cur++ = scale * ((*in >> 7) ); - *cur++ = scale * ((*in >> 6) & 0x01); - *cur++ = scale * ((*in >> 5) & 0x01); - *cur++ = scale * ((*in >> 4) & 0x01); - *cur++ = scale * ((*in >> 3) & 0x01); - *cur++ = scale * ((*in >> 2) & 0x01); - *cur++ = scale * ((*in >> 1) & 0x01); - *cur++ = scale * ((*in ) & 0x01); - } - if (k > 0) *cur++ = scale * ((*in >> 7) ); - if (k > 1) *cur++ = scale * ((*in >> 6) & 0x01); - if (k > 2) *cur++ = scale * ((*in >> 5) & 0x01); - if (k > 3) *cur++ = scale * ((*in >> 4) & 0x01); - if (k > 4) *cur++ = scale * ((*in >> 3) & 0x01); - if (k > 5) *cur++ = scale * ((*in >> 2) & 0x01); - if (k > 6) *cur++ = scale * ((*in >> 1) & 0x01); - } - if (img_n != out_n) { - int q; - // insert alpha = 255 - cur = a->out + stride*j; - if (img_n == 1) { - for (q=x-1; q >= 0; --q) { - cur[q*2+1] = 255; - cur[q*2+0] = cur[q]; - } - } else { - STBI_ASSERT(img_n == 3); - for (q=x-1; q >= 0; --q) { - cur[q*4+3] = 255; - cur[q*4+2] = cur[q*3+2]; - cur[q*4+1] = cur[q*3+1]; - cur[q*4+0] = cur[q*3+0]; - } - } - } - } - } else if (depth == 16) { - // force the image data from big-endian to platform-native. - // this is done in a separate pass due to the decoding relying - // on the data being untouched, but could probably be done - // per-line during decode if care is taken. - Xstbi_uc *cur = a->out; - Xstbi__uint16 *cur16 = (Xstbi__uint16*)cur; - - for(i=0; i < x*y*out_n; ++i,cur16++,cur+=2) { - *cur16 = (cur[0] << 8) | cur[1]; - } - } - - return 1; -} - -static int Xstbi__create_png_image(Xstbi__png *a, Xstbi_uc *image_data, Xstbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced) -{ - int bytes = (depth == 16 ? 2 : 1); - int out_bytes = out_n * bytes; - Xstbi_uc *final; - int p; - if (!interlaced) - return Xstbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color); - - // de-interlacing - final = (Xstbi_uc *) Xstbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0); - for (p=0; p < 7; ++p) { - int xorig[] = { 0,4,0,2,0,1,0 }; - int yorig[] = { 0,0,4,0,2,0,1 }; - int xspc[] = { 8,8,4,4,2,2,1 }; - int yspc[] = { 8,8,8,4,4,2,2 }; - int i,j,x,y; - // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1 - x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p]; - y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p]; - if (x && y) { - Xstbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y; - if (!Xstbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) { - STBI_FREE(final); - return 0; - } - for (j=0; j < y; ++j) { - for (i=0; i < x; ++i) { - int out_y = j*yspc[p]+yorig[p]; - int out_x = i*xspc[p]+xorig[p]; - memcpy(final + out_y*a->s->img_x*out_bytes + out_x*out_bytes, - a->out + (j*x+i)*out_bytes, out_bytes); - } - } - STBI_FREE(a->out); - image_data += img_len; - image_data_len -= img_len; - } - } - a->out = final; - - return 1; -} - -static int Xstbi__compute_transparency(Xstbi__png *z, Xstbi_uc tc[3], int out_n) -{ - Xstbi__context *s = z->s; - Xstbi__uint32 i, pixel_count = s->img_x * s->img_y; - Xstbi_uc *p = z->out; - - // compute color-based transparency, assuming we've - // already got 255 as the alpha value in the output - STBI_ASSERT(out_n == 2 || out_n == 4); - - if (out_n == 2) { - for (i=0; i < pixel_count; ++i) { - p[1] = (p[0] == tc[0] ? 0 : 255); - p += 2; - } - } else { - for (i=0; i < pixel_count; ++i) { - if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) - p[3] = 0; - p += 4; - } - } - return 1; -} - -static int Xstbi__compute_transparency16(Xstbi__png *z, Xstbi__uint16 tc[3], int out_n) -{ - Xstbi__context *s = z->s; - Xstbi__uint32 i, pixel_count = s->img_x * s->img_y; - Xstbi__uint16 *p = (Xstbi__uint16*) z->out; - - // compute color-based transparency, assuming we've - // already got 65535 as the alpha value in the output - STBI_ASSERT(out_n == 2 || out_n == 4); - - if (out_n == 2) { - for (i = 0; i < pixel_count; ++i) { - p[1] = (p[0] == tc[0] ? 0 : 65535); - p += 2; - } - } else { - for (i = 0; i < pixel_count; ++i) { - if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) - p[3] = 0; - p += 4; - } - } - return 1; -} - -static int Xstbi__expand_png_palette(Xstbi__png *a, Xstbi_uc *palette, int len, int pal_img_n) -{ - Xstbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y; - Xstbi_uc *p, *temp_out, *orig = a->out; - - p = (Xstbi_uc *) Xstbi__malloc_mad2(pixel_count, pal_img_n, 0); - if (p == NULL) return Xstbi__err("outofmem", "Out of memory"); - - // between here and free(out) below, exitting would leak - temp_out = p; - - if (pal_img_n == 3) { - for (i=0; i < pixel_count; ++i) { - int n = orig[i]*4; - p[0] = palette[n ]; - p[1] = palette[n+1]; - p[2] = palette[n+2]; - p += 3; - } - } else { - for (i=0; i < pixel_count; ++i) { - int n = orig[i]*4; - p[0] = palette[n ]; - p[1] = palette[n+1]; - p[2] = palette[n+2]; - p[3] = palette[n+3]; - p += 4; - } - } - STBI_FREE(a->out); - a->out = temp_out; - - STBI_NOTUSED(len); - - return 1; -} - -static int Xstbi__unpremultiply_on_load = 0; -static int Xstbi__de_iphone_flag = 0; - -STBIDEF void Xstbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) -{ - Xstbi__unpremultiply_on_load = flag_true_if_should_unpremultiply; -} - -STBIDEF void Xstbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) -{ - Xstbi__de_iphone_flag = flag_true_if_should_convert; -} - -static void Xstbi__de_iphone(Xstbi__png *z) -{ - Xstbi__context *s = z->s; - Xstbi__uint32 i, pixel_count = s->img_x * s->img_y; - Xstbi_uc *p = z->out; - - if (s->img_out_n == 3) { // convert bgr to rgb - for (i=0; i < pixel_count; ++i) { - Xstbi_uc t = p[0]; - p[0] = p[2]; - p[2] = t; - p += 3; - } - } else { - STBI_ASSERT(s->img_out_n == 4); - if (Xstbi__unpremultiply_on_load) { - // convert bgr to rgb and unpremultiply - for (i=0; i < pixel_count; ++i) { - Xstbi_uc a = p[3]; - Xstbi_uc t = p[0]; - if (a) { - p[0] = p[2] * 255 / a; - p[1] = p[1] * 255 / a; - p[2] = t * 255 / a; - } else { - p[0] = p[2]; - p[2] = t; - } - p += 4; - } - } else { - // convert bgr to rgb - for (i=0; i < pixel_count; ++i) { - Xstbi_uc t = p[0]; - p[0] = p[2]; - p[2] = t; - p += 4; - } - } - } -} - -#define STBI__PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d)) - -static int Xstbi__parse_png_file(Xstbi__png *z, int scan, int req_comp) -{ - Xstbi_uc palette[1024], pal_img_n=0; - Xstbi_uc has_trans=0, tc[3]; - Xstbi__uint16 tc16[3]; - Xstbi__uint32 ioff=0, idata_limit=0, i, pal_len=0; - int first=1,k,interlace=0, color=0, is_iphone=0; - Xstbi__context *s = z->s; - - z->expanded = NULL; - z->idata = NULL; - z->out = NULL; - - if (!Xstbi__check_png_header(s)) return 0; - - if (scan == STBI__SCAN_type) return 1; - - for (;;) { - Xstbi__pngchunk c = Xstbi__get_chunk_header(s); - switch (c.type) { - case STBI__PNG_TYPE('C','g','B','I'): - is_iphone = 1; - Xstbi__skip(s, c.length); - break; - case STBI__PNG_TYPE('I','H','D','R'): { - int comp,filter; - if (!first) return Xstbi__err("multiple IHDR","Corrupt PNG"); - first = 0; - if (c.length != 13) return Xstbi__err("bad IHDR len","Corrupt PNG"); - s->img_x = Xstbi__get32be(s); if (s->img_x > (1 << 24)) return Xstbi__err("too large","Very large image (corrupt?)"); - s->img_y = Xstbi__get32be(s); if (s->img_y > (1 << 24)) return Xstbi__err("too large","Very large image (corrupt?)"); - z->depth = Xstbi__get8(s); if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16) return Xstbi__err("1/2/4/8/16-bit only","PNG not supported: 1/2/4/8/16-bit only"); - color = Xstbi__get8(s); if (color > 6) return Xstbi__err("bad ctype","Corrupt PNG"); - if (color == 3 && z->depth == 16) return Xstbi__err("bad ctype","Corrupt PNG"); - if (color == 3) pal_img_n = 3; else if (color & 1) return Xstbi__err("bad ctype","Corrupt PNG"); - comp = Xstbi__get8(s); if (comp) return Xstbi__err("bad comp method","Corrupt PNG"); - filter= Xstbi__get8(s); if (filter) return Xstbi__err("bad filter method","Corrupt PNG"); - interlace = Xstbi__get8(s); if (interlace>1) return Xstbi__err("bad interlace method","Corrupt PNG"); - if (!s->img_x || !s->img_y) return Xstbi__err("0-pixel image","Corrupt PNG"); - if (!pal_img_n) { - s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); - if ((1 << 30) / s->img_x / s->img_n < s->img_y) return Xstbi__err("too large", "Image too large to decode"); - if (scan == STBI__SCAN_header) return 1; - } else { - // if paletted, then pal_n is our final components, and - // img_n is # components to decompress/filter. - s->img_n = 1; - if ((1 << 30) / s->img_x / 4 < s->img_y) return Xstbi__err("too large","Corrupt PNG"); - // if SCAN_header, have to scan to see if we have a tRNS - } - break; - } - - case STBI__PNG_TYPE('P','L','T','E'): { - if (first) return Xstbi__err("first not IHDR", "Corrupt PNG"); - if (c.length > 256*3) return Xstbi__err("invalid PLTE","Corrupt PNG"); - pal_len = c.length / 3; - if (pal_len * 3 != c.length) return Xstbi__err("invalid PLTE","Corrupt PNG"); - for (i=0; i < pal_len; ++i) { - palette[i*4+0] = Xstbi__get8(s); - palette[i*4+1] = Xstbi__get8(s); - palette[i*4+2] = Xstbi__get8(s); - palette[i*4+3] = 255; - } - break; - } - - case STBI__PNG_TYPE('t','R','N','S'): { - if (first) return Xstbi__err("first not IHDR", "Corrupt PNG"); - if (z->idata) return Xstbi__err("tRNS after IDAT","Corrupt PNG"); - if (pal_img_n) { - if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; } - if (pal_len == 0) return Xstbi__err("tRNS before PLTE","Corrupt PNG"); - if (c.length > pal_len) return Xstbi__err("bad tRNS len","Corrupt PNG"); - pal_img_n = 4; - for (i=0; i < c.length; ++i) - palette[i*4+3] = Xstbi__get8(s); - } else { - if (!(s->img_n & 1)) return Xstbi__err("tRNS with alpha","Corrupt PNG"); - if (c.length != (Xstbi__uint32) s->img_n*2) return Xstbi__err("bad tRNS len","Corrupt PNG"); - has_trans = 1; - if (z->depth == 16) { - for (k = 0; k < s->img_n; ++k) tc16[k] = (Xstbi__uint16)Xstbi__get16be(s); // copy the values as-is - } else { - for (k = 0; k < s->img_n; ++k) tc[k] = (Xstbi_uc)(Xstbi__get16be(s) & 255) * Xstbi__depth_scale_table[z->depth]; // non 8-bit images will be larger - } - } - break; - } - - case STBI__PNG_TYPE('I','D','A','T'): { - if (first) return Xstbi__err("first not IHDR", "Corrupt PNG"); - if (pal_img_n && !pal_len) return Xstbi__err("no PLTE","Corrupt PNG"); - if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; } - if ((int)(ioff + c.length) < (int)ioff) return 0; - if (ioff + c.length > idata_limit) { - Xstbi__uint32 idata_limit_old = idata_limit; - Xstbi_uc *p; - if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096; - while (ioff + c.length > idata_limit) - idata_limit *= 2; - STBI_NOTUSED(idata_limit_old); - p = (Xstbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return Xstbi__err("outofmem", "Out of memory"); - z->idata = p; - } - if (!Xstbi__getn(s, z->idata+ioff,c.length)) return Xstbi__err("outofdata","Corrupt PNG"); - ioff += c.length; - break; - } - - case STBI__PNG_TYPE('I','E','N','D'): { - Xstbi__uint32 raw_len, bpl; - if (first) return Xstbi__err("first not IHDR", "Corrupt PNG"); - if (scan != STBI__SCAN_load) return 1; - if (z->idata == NULL) return Xstbi__err("no IDAT","Corrupt PNG"); - // initial guess for decoded data size to avoid unnecessary reallocs - bpl = (s->img_x * z->depth + 7) / 8; // bytes per line, per component - raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */; - z->expanded = (Xstbi_uc *) Xstbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone); - if (z->expanded == NULL) return 0; // zlib should set error - STBI_FREE(z->idata); z->idata = NULL; - if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans) - s->img_out_n = s->img_n+1; - else - s->img_out_n = s->img_n; - if (!Xstbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, z->depth, color, interlace)) return 0; - if (has_trans) { - if (z->depth == 16) { - if (!Xstbi__compute_transparency16(z, tc16, s->img_out_n)) return 0; - } else { - if (!Xstbi__compute_transparency(z, tc, s->img_out_n)) return 0; - } - } - if (is_iphone && Xstbi__de_iphone_flag && s->img_out_n > 2) - Xstbi__de_iphone(z); - if (pal_img_n) { - // pal_img_n == 3 or 4 - s->img_n = pal_img_n; // record the actual colors we had - s->img_out_n = pal_img_n; - if (req_comp >= 3) s->img_out_n = req_comp; - if (!Xstbi__expand_png_palette(z, palette, pal_len, s->img_out_n)) - return 0; - } - STBI_FREE(z->expanded); z->expanded = NULL; - return 1; - } - - default: - // if critical, fail - if (first) return Xstbi__err("first not IHDR", "Corrupt PNG"); - if ((c.type & (1 << 29)) == 0) { - #ifndef STBI_NO_FAILURE_STRINGS - // not threadsafe - static char invalid_chunk[] = "XXXX PNG chunk not known"; - invalid_chunk[0] = STBI__BYTECAST(c.type >> 24); - invalid_chunk[1] = STBI__BYTECAST(c.type >> 16); - invalid_chunk[2] = STBI__BYTECAST(c.type >> 8); - invalid_chunk[3] = STBI__BYTECAST(c.type >> 0); - #endif - return Xstbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type"); - } - Xstbi__skip(s, c.length); - break; - } - // end of PNG chunk, read and skip CRC - Xstbi__get32be(s); - } -} - -static void *Xstbi__do_png(Xstbi__png *p, int *x, int *y, int *n, int req_comp, Xstbi__result_info *ri) -{ - void *result=NULL; - if (req_comp < 0 || req_comp > 4) return Xstbi__errpuc("bad req_comp", "Internal error"); - if (Xstbi__parse_png_file(p, STBI__SCAN_load, req_comp)) { - if (p->depth < 8) - ri->bits_per_channel = 8; - else - ri->bits_per_channel = p->depth; - result = p->out; - p->out = NULL; - if (req_comp && req_comp != p->s->img_out_n) { - if (ri->bits_per_channel == 8) - result = Xstbi__convert_format((unsigned char *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); - else - result = Xstbi__convert_format16((Xstbi__uint16 *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); - p->s->img_out_n = req_comp; - if (result == NULL) return result; - } - *x = p->s->img_x; - *y = p->s->img_y; - if (n) *n = p->s->img_n; - } - STBI_FREE(p->out); p->out = NULL; - STBI_FREE(p->expanded); p->expanded = NULL; - STBI_FREE(p->idata); p->idata = NULL; - - return result; -} - -static void *Xstbi__png_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri) -{ - Xstbi__png p; - p.s = s; - return Xstbi__do_png(&p, x,y,comp,req_comp, ri); -} - -static int Xstbi__png_test(Xstbi__context *s) -{ - int r; - r = Xstbi__check_png_header(s); - Xstbi__rewind(s); - return r; -} - -static int Xstbi__png_info_raw(Xstbi__png *p, int *x, int *y, int *comp) -{ - if (!Xstbi__parse_png_file(p, STBI__SCAN_header, 0)) { - Xstbi__rewind( p->s ); - return 0; - } - if (x) *x = p->s->img_x; - if (y) *y = p->s->img_y; - if (comp) *comp = p->s->img_n; - return 1; -} - -static int Xstbi__png_info(Xstbi__context *s, int *x, int *y, int *comp) -{ - Xstbi__png p; - p.s = s; - return Xstbi__png_info_raw(&p, x, y, comp); -} -#endif - -// Microsoft/Windows BMP image - -#ifndef STBI_NO_BMP -static int Xstbi__bmp_test_raw(Xstbi__context *s) -{ - int r; - int sz; - if (Xstbi__get8(s) != 'B') return 0; - if (Xstbi__get8(s) != 'M') return 0; - Xstbi__get32le(s); // discard filesize - Xstbi__get16le(s); // discard reserved - Xstbi__get16le(s); // discard reserved - Xstbi__get32le(s); // discard data offset - sz = Xstbi__get32le(s); - r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124); - return r; -} - -static int Xstbi__bmp_test(Xstbi__context *s) -{ - int r = Xstbi__bmp_test_raw(s); - Xstbi__rewind(s); - return r; -} - - -// returns 0..31 for the highest set bit -static int Xstbi__high_bit(unsigned int z) -{ - int n=0; - if (z == 0) return -1; - if (z >= 0x10000) n += 16, z >>= 16; - if (z >= 0x00100) n += 8, z >>= 8; - if (z >= 0x00010) n += 4, z >>= 4; - if (z >= 0x00004) n += 2, z >>= 2; - if (z >= 0x00002) n += 1, z >>= 1; - return n; -} - -static int Xstbi__bitcount(unsigned int a) -{ - a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2 - a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4 - a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits - a = (a + (a >> 8)); // max 16 per 8 bits - a = (a + (a >> 16)); // max 32 per 8 bits - return a & 0xff; -} - -static int Xstbi__shiftsigned(int v, int shift, int bits) -{ - int result; - int z=0; - - if (shift < 0) v <<= -shift; - else v >>= shift; - result = v; - - z = bits; - while (z < 8) { - result += v >> z; - z += bits; - } - return result; -} - -typedef struct -{ - int bpp, offset, hsz; - unsigned int mr,mg,mb,ma, all_a; -} Xstbi__bmp_data; - -static void *Xstbi__bmp_parse_header(Xstbi__context *s, Xstbi__bmp_data *info) -{ - int hsz; - if (Xstbi__get8(s) != 'B' || Xstbi__get8(s) != 'M') return Xstbi__errpuc("not BMP", "Corrupt BMP"); - Xstbi__get32le(s); // discard filesize - Xstbi__get16le(s); // discard reserved - Xstbi__get16le(s); // discard reserved - info->offset = Xstbi__get32le(s); - info->hsz = hsz = Xstbi__get32le(s); - info->mr = info->mg = info->mb = info->ma = 0; - - if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return Xstbi__errpuc("unknown BMP", "BMP type not supported: unknown"); - if (hsz == 12) { - s->img_x = Xstbi__get16le(s); - s->img_y = Xstbi__get16le(s); - } else { - s->img_x = Xstbi__get32le(s); - s->img_y = Xstbi__get32le(s); - } - if (Xstbi__get16le(s) != 1) return Xstbi__errpuc("bad BMP", "bad BMP"); - info->bpp = Xstbi__get16le(s); - if (info->bpp == 1) return Xstbi__errpuc("monochrome", "BMP type not supported: 1-bit"); - if (hsz != 12) { - int compress = Xstbi__get32le(s); - if (compress == 1 || compress == 2) return Xstbi__errpuc("BMP RLE", "BMP type not supported: RLE"); - Xstbi__get32le(s); // discard sizeof - Xstbi__get32le(s); // discard hres - Xstbi__get32le(s); // discard vres - Xstbi__get32le(s); // discard colorsused - Xstbi__get32le(s); // discard max important - if (hsz == 40 || hsz == 56) { - if (hsz == 56) { - Xstbi__get32le(s); - Xstbi__get32le(s); - Xstbi__get32le(s); - Xstbi__get32le(s); - } - if (info->bpp == 16 || info->bpp == 32) { - if (compress == 0) { - if (info->bpp == 32) { - info->mr = 0xffu << 16; - info->mg = 0xffu << 8; - info->mb = 0xffu << 0; - info->ma = 0xffu << 24; - info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0 - } else { - info->mr = 31u << 10; - info->mg = 31u << 5; - info->mb = 31u << 0; - } - } else if (compress == 3) { - info->mr = Xstbi__get32le(s); - info->mg = Xstbi__get32le(s); - info->mb = Xstbi__get32le(s); - // not documented, but generated by photoshop and handled by mspaint - if (info->mr == info->mg && info->mg == info->mb) { - // ?!?!? - return Xstbi__errpuc("bad BMP", "bad BMP"); - } - } else - return Xstbi__errpuc("bad BMP", "bad BMP"); - } - } else { - int i; - if (hsz != 108 && hsz != 124) - return Xstbi__errpuc("bad BMP", "bad BMP"); - info->mr = Xstbi__get32le(s); - info->mg = Xstbi__get32le(s); - info->mb = Xstbi__get32le(s); - info->ma = Xstbi__get32le(s); - Xstbi__get32le(s); // discard color space - for (i=0; i < 12; ++i) - Xstbi__get32le(s); // discard color space parameters - if (hsz == 124) { - Xstbi__get32le(s); // discard rendering intent - Xstbi__get32le(s); // discard offset of profile data - Xstbi__get32le(s); // discard size of profile data - Xstbi__get32le(s); // discard reserved - } - } - } - return (void *) 1; -} - - -static void *Xstbi__bmp_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri) -{ - Xstbi_uc *out; - unsigned int mr=0,mg=0,mb=0,ma=0, all_a; - Xstbi_uc pal[256][4]; - int psize=0,i,j,width; - int flip_vertically, pad, target; - Xstbi__bmp_data info; - STBI_NOTUSED(ri); - - info.all_a = 255; - if (Xstbi__bmp_parse_header(s, &info) == NULL) - return NULL; // error code already set - - flip_vertically = ((int) s->img_y) > 0; - s->img_y = abs((int) s->img_y); - - mr = info.mr; - mg = info.mg; - mb = info.mb; - ma = info.ma; - all_a = info.all_a; - - if (info.hsz == 12) { - if (info.bpp < 24) - psize = (info.offset - 14 - 24) / 3; - } else { - if (info.bpp < 16) - psize = (info.offset - 14 - info.hsz) >> 2; - } - - s->img_n = ma ? 4 : 3; - if (req_comp && req_comp >= 3) // we can directly decode 3 or 4 - target = req_comp; - else - target = s->img_n; // if they want monochrome, we'll post-convert - - // sanity-check size - if (!Xstbi__mad3sizes_valid(target, s->img_x, s->img_y, 0)) - return Xstbi__errpuc("too large", "Corrupt BMP"); - - out = (Xstbi_uc *) Xstbi__malloc_mad3(target, s->img_x, s->img_y, 0); - if (!out) return Xstbi__errpuc("outofmem", "Out of memory"); - if (info.bpp < 16) { - int z=0; - if (psize == 0 || psize > 256) { STBI_FREE(out); return Xstbi__errpuc("invalid", "Corrupt BMP"); } - for (i=0; i < psize; ++i) { - pal[i][2] = Xstbi__get8(s); - pal[i][1] = Xstbi__get8(s); - pal[i][0] = Xstbi__get8(s); - if (info.hsz != 12) Xstbi__get8(s); - pal[i][3] = 255; - } - Xstbi__skip(s, info.offset - 14 - info.hsz - psize * (info.hsz == 12 ? 3 : 4)); - if (info.bpp == 4) width = (s->img_x + 1) >> 1; - else if (info.bpp == 8) width = s->img_x; - else { STBI_FREE(out); return Xstbi__errpuc("bad bpp", "Corrupt BMP"); } - pad = (-width)&3; - for (j=0; j < (int) s->img_y; ++j) { - for (i=0; i < (int) s->img_x; i += 2) { - int v=Xstbi__get8(s),v2=0; - if (info.bpp == 4) { - v2 = v & 15; - v >>= 4; - } - out[z++] = pal[v][0]; - out[z++] = pal[v][1]; - out[z++] = pal[v][2]; - if (target == 4) out[z++] = 255; - if (i+1 == (int) s->img_x) break; - v = (info.bpp == 8) ? Xstbi__get8(s) : v2; - out[z++] = pal[v][0]; - out[z++] = pal[v][1]; - out[z++] = pal[v][2]; - if (target == 4) out[z++] = 255; - } - Xstbi__skip(s, pad); - } - } else { - int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0; - int z = 0; - int easy=0; - Xstbi__skip(s, info.offset - 14 - info.hsz); - if (info.bpp == 24) width = 3 * s->img_x; - else if (info.bpp == 16) width = 2*s->img_x; - else /* bpp = 32 and pad = 0 */ width=0; - pad = (-width) & 3; - if (info.bpp == 24) { - easy = 1; - } else if (info.bpp == 32) { - if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000) - easy = 2; - } - if (!easy) { - if (!mr || !mg || !mb) { STBI_FREE(out); return Xstbi__errpuc("bad masks", "Corrupt BMP"); } - // right shift amt to put high bit in position #7 - rshift = Xstbi__high_bit(mr)-7; rcount = Xstbi__bitcount(mr); - gshift = Xstbi__high_bit(mg)-7; gcount = Xstbi__bitcount(mg); - bshift = Xstbi__high_bit(mb)-7; bcount = Xstbi__bitcount(mb); - ashift = Xstbi__high_bit(ma)-7; acount = Xstbi__bitcount(ma); - } - for (j=0; j < (int) s->img_y; ++j) { - if (easy) { - for (i=0; i < (int) s->img_x; ++i) { - unsigned char a; - out[z+2] = Xstbi__get8(s); - out[z+1] = Xstbi__get8(s); - out[z+0] = Xstbi__get8(s); - z += 3; - a = (easy == 2 ? Xstbi__get8(s) : 255); - all_a |= a; - if (target == 4) out[z++] = a; - } - } else { - int bpp = info.bpp; - for (i=0; i < (int) s->img_x; ++i) { - Xstbi__uint32 v = (bpp == 16 ? (Xstbi__uint32) Xstbi__get16le(s) : Xstbi__get32le(s)); - int a; - out[z++] = STBI__BYTECAST(Xstbi__shiftsigned(v & mr, rshift, rcount)); - out[z++] = STBI__BYTECAST(Xstbi__shiftsigned(v & mg, gshift, gcount)); - out[z++] = STBI__BYTECAST(Xstbi__shiftsigned(v & mb, bshift, bcount)); - a = (ma ? Xstbi__shiftsigned(v & ma, ashift, acount) : 255); - all_a |= a; - if (target == 4) out[z++] = STBI__BYTECAST(a); - } - } - Xstbi__skip(s, pad); - } - } - - // if alpha channel is all 0s, replace with all 255s - if (target == 4 && all_a == 0) - for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4) - out[i] = 255; - - if (flip_vertically) { - Xstbi_uc t; - for (j=0; j < (int) s->img_y>>1; ++j) { - Xstbi_uc *p1 = out + j *s->img_x*target; - Xstbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target; - for (i=0; i < (int) s->img_x*target; ++i) { - t = p1[i], p1[i] = p2[i], p2[i] = t; - } - } - } - - if (req_comp && req_comp != target) { - out = Xstbi__convert_format(out, target, req_comp, s->img_x, s->img_y); - if (out == NULL) return out; // Xstbi__convert_format frees input on failure - } - - *x = s->img_x; - *y = s->img_y; - if (comp) *comp = s->img_n; - return out; -} -#endif - -// Targa Truevision - TGA -// by Jonathan Dummer -#ifndef STBI_NO_TGA -// returns STBI_rgb or whatever, 0 on error -static int Xstbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16) -{ - // only RGB or RGBA (incl. 16bit) or grey allowed - if(is_rgb16) *is_rgb16 = 0; - switch(bits_per_pixel) { - case 8: return STBI_grey; - case 16: if(is_grey) return STBI_grey_alpha; - // else: fall-through - case 15: if(is_rgb16) *is_rgb16 = 1; - return STBI_rgb; - case 24: // fall-through - case 32: return bits_per_pixel/8; - default: return 0; - } -} - -static int Xstbi__tga_info(Xstbi__context *s, int *x, int *y, int *comp) -{ - int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp; - int sz, tga_colormap_type; - Xstbi__get8(s); // discard Offset - tga_colormap_type = Xstbi__get8(s); // colormap type - if( tga_colormap_type > 1 ) { - Xstbi__rewind(s); - return 0; // only RGB or indexed allowed - } - tga_image_type = Xstbi__get8(s); // image type - if ( tga_colormap_type == 1 ) { // colormapped (paletted) image - if (tga_image_type != 1 && tga_image_type != 9) { - Xstbi__rewind(s); - return 0; - } - Xstbi__skip(s,4); // skip index of first colormap entry and number of entries - sz = Xstbi__get8(s); // check bits per palette color entry - if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) { - Xstbi__rewind(s); - return 0; - } - Xstbi__skip(s,4); // skip image x and y origin - tga_colormap_bpp = sz; - } else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE - if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) { - Xstbi__rewind(s); - return 0; // only RGB or grey allowed, +/- RLE - } - Xstbi__skip(s,9); // skip colormap specification and image x/y origin - tga_colormap_bpp = 0; - } - tga_w = Xstbi__get16le(s); - if( tga_w < 1 ) { - Xstbi__rewind(s); - return 0; // test width - } - tga_h = Xstbi__get16le(s); - if( tga_h < 1 ) { - Xstbi__rewind(s); - return 0; // test height - } - tga_bits_per_pixel = Xstbi__get8(s); // bits per pixel - Xstbi__get8(s); // ignore alpha bits - if (tga_colormap_bpp != 0) { - if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) { - // when using a colormap, tga_bits_per_pixel is the size of the indexes - // I don't think anything but 8 or 16bit indexes makes sense - Xstbi__rewind(s); - return 0; - } - tga_comp = Xstbi__tga_get_comp(tga_colormap_bpp, 0, NULL); - } else { - tga_comp = Xstbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL); - } - if(!tga_comp) { - Xstbi__rewind(s); - return 0; - } - if (x) *x = tga_w; - if (y) *y = tga_h; - if (comp) *comp = tga_comp; - return 1; // seems to have passed everything -} - -static int Xstbi__tga_test(Xstbi__context *s) -{ - int res = 0; - int sz, tga_color_type; - Xstbi__get8(s); // discard Offset - tga_color_type = Xstbi__get8(s); // color type - if ( tga_color_type > 1 ) goto errorEnd; // only RGB or indexed allowed - sz = Xstbi__get8(s); // image type - if ( tga_color_type == 1 ) { // colormapped (paletted) image - if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9 - Xstbi__skip(s,4); // skip index of first colormap entry and number of entries - sz = Xstbi__get8(s); // check bits per palette color entry - if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; - Xstbi__skip(s,4); // skip image x and y origin - } else { // "normal" image w/o colormap - if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE - Xstbi__skip(s,9); // skip colormap specification and image x/y origin - } - if ( Xstbi__get16le(s) < 1 ) goto errorEnd; // test width - if ( Xstbi__get16le(s) < 1 ) goto errorEnd; // test height - sz = Xstbi__get8(s); // bits per pixel - if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index - if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; - - res = 1; // if we got this far, everything's good and we can return 1 instead of 0 - -errorEnd: - Xstbi__rewind(s); - return res; -} - -// read 16bit value and convert to 24bit RGB -static void Xstbi__tga_read_rgb16(Xstbi__context *s, Xstbi_uc* out) -{ - Xstbi__uint16 px = (Xstbi__uint16)Xstbi__get16le(s); - Xstbi__uint16 fiveBitMask = 31; - // we have 3 channels with 5bits each - int r = (px >> 10) & fiveBitMask; - int g = (px >> 5) & fiveBitMask; - int b = px & fiveBitMask; - // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later - out[0] = (Xstbi_uc)((r * 255)/31); - out[1] = (Xstbi_uc)((g * 255)/31); - out[2] = (Xstbi_uc)((b * 255)/31); - - // some people claim that the most significant bit might be used for alpha - // (possibly if an alpha-bit is set in the "image descriptor byte") - // but that only made 16bit test images completely translucent.. - // so let's treat all 15 and 16bit TGAs as RGB with no alpha. -} - -static void *Xstbi__tga_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri) -{ - // read in the TGA header stuff - int tga_offset = Xstbi__get8(s); - int tga_indexed = Xstbi__get8(s); - int tga_image_type = Xstbi__get8(s); - int tga_is_RLE = 0; - int tga_palette_start = Xstbi__get16le(s); - int tga_palette_len = Xstbi__get16le(s); - int tga_palette_bits = Xstbi__get8(s); - int tga_x_origin = Xstbi__get16le(s); - int tga_y_origin = Xstbi__get16le(s); - int tga_width = Xstbi__get16le(s); - int tga_height = Xstbi__get16le(s); - int tga_bits_per_pixel = Xstbi__get8(s); - int tga_comp, tga_rgb16=0; - int tga_inverted = Xstbi__get8(s); - // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?) - // image data - unsigned char *tga_data; - unsigned char *tga_palette = NULL; - int i, j; - unsigned char raw_data[4] = {0}; - int RLE_count = 0; - int RLE_repeating = 0; - int read_next_pixel = 1; - STBI_NOTUSED(ri); - - // do a tiny bit of precessing - if ( tga_image_type >= 8 ) - { - tga_image_type -= 8; - tga_is_RLE = 1; - } - tga_inverted = 1 - ((tga_inverted >> 5) & 1); - - // If I'm paletted, then I'll use the number of bits from the palette - if ( tga_indexed ) tga_comp = Xstbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16); - else tga_comp = Xstbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16); - - if(!tga_comp) // shouldn't really happen, Xstbi__tga_test() should have ensured basic consistency - return Xstbi__errpuc("bad format", "Can't find out TGA pixelformat"); - - // tga info - *x = tga_width; - *y = tga_height; - if (comp) *comp = tga_comp; - - if (!Xstbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0)) - return Xstbi__errpuc("too large", "Corrupt TGA"); - - tga_data = (unsigned char*)Xstbi__malloc_mad3(tga_width, tga_height, tga_comp, 0); - if (!tga_data) return Xstbi__errpuc("outofmem", "Out of memory"); - - // skip to the data's starting position (offset usually = 0) - Xstbi__skip(s, tga_offset ); - - if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) { - for (i=0; i < tga_height; ++i) { - int row = tga_inverted ? tga_height -i - 1 : i; - Xstbi_uc *tga_row = tga_data + row*tga_width*tga_comp; - Xstbi__getn(s, tga_row, tga_width * tga_comp); - } - } else { - // do I need to load a palette? - if ( tga_indexed) - { - // any data to skip? (offset usually = 0) - Xstbi__skip(s, tga_palette_start ); - // load the palette - tga_palette = (unsigned char*)Xstbi__malloc_mad2(tga_palette_len, tga_comp, 0); - if (!tga_palette) { - STBI_FREE(tga_data); - return Xstbi__errpuc("outofmem", "Out of memory"); - } - if (tga_rgb16) { - Xstbi_uc *pal_entry = tga_palette; - STBI_ASSERT(tga_comp == STBI_rgb); - for (i=0; i < tga_palette_len; ++i) { - Xstbi__tga_read_rgb16(s, pal_entry); - pal_entry += tga_comp; - } - } else if (!Xstbi__getn(s, tga_palette, tga_palette_len * tga_comp)) { - STBI_FREE(tga_data); - STBI_FREE(tga_palette); - return Xstbi__errpuc("bad palette", "Corrupt TGA"); - } - } - // load the data - for (i=0; i < tga_width * tga_height; ++i) - { - // if I'm in RLE mode, do I need to get a RLE Xstbi__pngchunk? - if ( tga_is_RLE ) - { - if ( RLE_count == 0 ) - { - // yep, get the next byte as a RLE command - int RLE_cmd = Xstbi__get8(s); - RLE_count = 1 + (RLE_cmd & 127); - RLE_repeating = RLE_cmd >> 7; - read_next_pixel = 1; - } else if ( !RLE_repeating ) - { - read_next_pixel = 1; - } - } else - { - read_next_pixel = 1; - } - // OK, if I need to read a pixel, do it now - if ( read_next_pixel ) - { - // load however much data we did have - if ( tga_indexed ) - { - // read in index, then perform the lookup - int pal_idx = (tga_bits_per_pixel == 8) ? Xstbi__get8(s) : Xstbi__get16le(s); - if ( pal_idx >= tga_palette_len ) { - // invalid index - pal_idx = 0; - } - pal_idx *= tga_comp; - for (j = 0; j < tga_comp; ++j) { - raw_data[j] = tga_palette[pal_idx+j]; - } - } else if(tga_rgb16) { - STBI_ASSERT(tga_comp == STBI_rgb); - Xstbi__tga_read_rgb16(s, raw_data); - } else { - // read in the data raw - for (j = 0; j < tga_comp; ++j) { - raw_data[j] = Xstbi__get8(s); - } - } - // clear the reading flag for the next pixel - read_next_pixel = 0; - } // end of reading a pixel - - // copy data - for (j = 0; j < tga_comp; ++j) - tga_data[i*tga_comp+j] = raw_data[j]; - - // in case we're in RLE mode, keep counting down - --RLE_count; - } - // do I need to invert the image? - if ( tga_inverted ) - { - for (j = 0; j*2 < tga_height; ++j) - { - int index1 = j * tga_width * tga_comp; - int index2 = (tga_height - 1 - j) * tga_width * tga_comp; - for (i = tga_width * tga_comp; i > 0; --i) - { - unsigned char temp = tga_data[index1]; - tga_data[index1] = tga_data[index2]; - tga_data[index2] = temp; - ++index1; - ++index2; - } - } - } - // clear my palette, if I had one - if ( tga_palette != NULL ) - { - STBI_FREE( tga_palette ); - } - } - - // swap RGB - if the source data was RGB16, it already is in the right order - if (tga_comp >= 3 && !tga_rgb16) - { - unsigned char* tga_pixel = tga_data; - for (i=0; i < tga_width * tga_height; ++i) - { - unsigned char temp = tga_pixel[0]; - tga_pixel[0] = tga_pixel[2]; - tga_pixel[2] = temp; - tga_pixel += tga_comp; - } - } - - // convert to target component count - if (req_comp && req_comp != tga_comp) - tga_data = Xstbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height); - - // the things I do to get rid of an error message, and yet keep - // Microsoft's C compilers happy... [8^( - tga_palette_start = tga_palette_len = tga_palette_bits = - tga_x_origin = tga_y_origin = 0; - // OK, done - return tga_data; -} -#endif - -// ************************************************************************************************* -// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB - -#ifndef STBI_NO_PSD -static int Xstbi__psd_test(Xstbi__context *s) -{ - int r = (Xstbi__get32be(s) == 0x38425053); - Xstbi__rewind(s); - return r; -} - -static int Xstbi__psd_decode_rle(Xstbi__context *s, Xstbi_uc *p, int pixelCount) -{ - int count, nleft, len; - - count = 0; - while ((nleft = pixelCount - count) > 0) { - len = Xstbi__get8(s); - if (len == 128) { - // No-op. - } else if (len < 128) { - // Copy next len+1 bytes literally. - len++; - if (len > nleft) return 0; // corrupt data - count += len; - while (len) { - *p = Xstbi__get8(s); - p += 4; - len--; - } - } else if (len > 128) { - Xstbi_uc val; - // Next -len+1 bytes in the dest are replicated from next source byte. - // (Interpret len as a negative 8-bit int.) - len = 257 - len; - if (len > nleft) return 0; // corrupt data - val = Xstbi__get8(s); - count += len; - while (len) { - *p = val; - p += 4; - len--; - } - } - } - - return 1; -} - -static void *Xstbi__psd_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri, int bpc) -{ - int pixelCount; - int channelCount, compression; - int channel, i; - int bitdepth; - int w,h; - Xstbi_uc *out; - STBI_NOTUSED(ri); - - // Check identifier - if (Xstbi__get32be(s) != 0x38425053) // "8BPS" - return Xstbi__errpuc("not PSD", "Corrupt PSD image"); - - // Check file type version. - if (Xstbi__get16be(s) != 1) - return Xstbi__errpuc("wrong version", "Unsupported version of PSD image"); - - // Skip 6 reserved bytes. - Xstbi__skip(s, 6 ); - - // Read the number of channels (R, G, B, A, etc). - channelCount = Xstbi__get16be(s); - if (channelCount < 0 || channelCount > 16) - return Xstbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image"); - - // Read the rows and columns of the image. - h = Xstbi__get32be(s); - w = Xstbi__get32be(s); - - // Make sure the depth is 8 bits. - bitdepth = Xstbi__get16be(s); - if (bitdepth != 8 && bitdepth != 16) - return Xstbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit"); - - // Make sure the color mode is RGB. - // Valid options are: - // 0: Bitmap - // 1: Grayscale - // 2: Indexed color - // 3: RGB color - // 4: CMYK color - // 7: Multichannel - // 8: Duotone - // 9: Lab color - if (Xstbi__get16be(s) != 3) - return Xstbi__errpuc("wrong color format", "PSD is not in RGB color format"); - - // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.) - Xstbi__skip(s,Xstbi__get32be(s) ); - - // Skip the image resources. (resolution, pen tool paths, etc) - Xstbi__skip(s, Xstbi__get32be(s) ); - - // Skip the reserved data. - Xstbi__skip(s, Xstbi__get32be(s) ); - - // Find out if the data is compressed. - // Known values: - // 0: no compression - // 1: RLE compressed - compression = Xstbi__get16be(s); - if (compression > 1) - return Xstbi__errpuc("bad compression", "PSD has an unknown compression format"); - - // Check size - if (!Xstbi__mad3sizes_valid(4, w, h, 0)) - return Xstbi__errpuc("too large", "Corrupt PSD"); - - // Create the destination image. - - if (!compression && bitdepth == 16 && bpc == 16) { - out = (Xstbi_uc *) Xstbi__malloc_mad3(8, w, h, 0); - ri->bits_per_channel = 16; - } else - out = (Xstbi_uc *) Xstbi__malloc(4 * w*h); - - if (!out) return Xstbi__errpuc("outofmem", "Out of memory"); - pixelCount = w*h; - - // Initialize the data to zero. - //memset( out, 0, pixelCount * 4 ); - - // Finally, the image data. - if (compression) { - // RLE as used by .PSD and .TIFF - // Loop until you get the number of unpacked bytes you are expecting: - // Read the next source byte into n. - // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally. - // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times. - // Else if n is 128, noop. - // Endloop - - // The RLE-compressed data is preceeded by a 2-byte data count for each row in the data, - // which we're going to just skip. - Xstbi__skip(s, h * channelCount * 2 ); - - // Read the RLE data by channel. - for (channel = 0; channel < 4; channel++) { - Xstbi_uc *p; - - p = out+channel; - if (channel >= channelCount) { - // Fill this channel with default data. - for (i = 0; i < pixelCount; i++, p += 4) - *p = (channel == 3 ? 255 : 0); - } else { - // Read the RLE data. - if (!Xstbi__psd_decode_rle(s, p, pixelCount)) { - STBI_FREE(out); - return Xstbi__errpuc("corrupt", "bad RLE data"); - } - } - } - - } else { - // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...) - // where each channel consists of an 8-bit (or 16-bit) value for each pixel in the image. - - // Read the data by channel. - for (channel = 0; channel < 4; channel++) { - if (channel >= channelCount) { - // Fill this channel with default data. - if (bitdepth == 16 && bpc == 16) { - Xstbi__uint16 *q = ((Xstbi__uint16 *) out) + channel; - Xstbi__uint16 val = channel == 3 ? 65535 : 0; - for (i = 0; i < pixelCount; i++, q += 4) - *q = val; - } else { - Xstbi_uc *p = out+channel; - Xstbi_uc val = channel == 3 ? 255 : 0; - for (i = 0; i < pixelCount; i++, p += 4) - *p = val; - } - } else { - if (ri->bits_per_channel == 16) { // output bpc - Xstbi__uint16 *q = ((Xstbi__uint16 *) out) + channel; - for (i = 0; i < pixelCount; i++, q += 4) - *q = (Xstbi__uint16) Xstbi__get16be(s); - } else { - Xstbi_uc *p = out+channel; - if (bitdepth == 16) { // input bpc - for (i = 0; i < pixelCount; i++, p += 4) - *p = (Xstbi_uc) (Xstbi__get16be(s) >> 8); - } else { - for (i = 0; i < pixelCount; i++, p += 4) - *p = Xstbi__get8(s); - } - } - } - } - } - - // remove weird white matte from PSD - if (channelCount >= 4) { - if (ri->bits_per_channel == 16) { - for (i=0; i < w*h; ++i) { - Xstbi__uint16 *pixel = (Xstbi__uint16 *) out + 4*i; - if (pixel[3] != 0 && pixel[3] != 65535) { - float a = pixel[3] / 65535.0f; - float ra = 1.0f / a; - float inv_a = 65535.0f * (1 - ra); - pixel[0] = (Xstbi__uint16) (pixel[0]*ra + inv_a); - pixel[1] = (Xstbi__uint16) (pixel[1]*ra + inv_a); - pixel[2] = (Xstbi__uint16) (pixel[2]*ra + inv_a); - } - } - } else { - for (i=0; i < w*h; ++i) { - unsigned char *pixel = out + 4*i; - if (pixel[3] != 0 && pixel[3] != 255) { - float a = pixel[3] / 255.0f; - float ra = 1.0f / a; - float inv_a = 255.0f * (1 - ra); - pixel[0] = (unsigned char) (pixel[0]*ra + inv_a); - pixel[1] = (unsigned char) (pixel[1]*ra + inv_a); - pixel[2] = (unsigned char) (pixel[2]*ra + inv_a); - } - } - } - } - - // convert to desired output format - if (req_comp && req_comp != 4) { - if (ri->bits_per_channel == 16) - out = (Xstbi_uc *) Xstbi__convert_format16((Xstbi__uint16 *) out, 4, req_comp, w, h); - else - out = Xstbi__convert_format(out, 4, req_comp, w, h); - if (out == NULL) return out; // Xstbi__convert_format frees input on failure - } - - if (comp) *comp = 4; - *y = h; - *x = w; - - return out; -} -#endif - -// ************************************************************************************************* -// Softimage PIC loader -// by Tom Seddon -// -// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format -// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/ - -#ifndef STBI_NO_PIC -static int Xstbi__pic_is4(Xstbi__context *s,const char *str) -{ - int i; - for (i=0; i<4; ++i) - if (Xstbi__get8(s) != (Xstbi_uc)str[i]) - return 0; - - return 1; -} - -static int Xstbi__pic_test_core(Xstbi__context *s) -{ - int i; - - if (!Xstbi__pic_is4(s,"\x53\x80\xF6\x34")) - return 0; - - for(i=0;i<84;++i) - Xstbi__get8(s); - - if (!Xstbi__pic_is4(s,"PICT")) - return 0; - - return 1; -} - -typedef struct -{ - Xstbi_uc size,type,channel; -} Xstbi__pic_packet; - -static Xstbi_uc *Xstbi__readval(Xstbi__context *s, int channel, Xstbi_uc *dest) -{ - int mask=0x80, i; - - for (i=0; i<4; ++i, mask>>=1) { - if (channel & mask) { - if (Xstbi__at_eof(s)) return Xstbi__errpuc("bad file","PIC file too short"); - dest[i]=Xstbi__get8(s); - } - } - - return dest; -} - -static void Xstbi__copyval(int channel,Xstbi_uc *dest,const Xstbi_uc *src) -{ - int mask=0x80,i; - - for (i=0;i<4; ++i, mask>>=1) - if (channel&mask) - dest[i]=src[i]; -} - -static Xstbi_uc *Xstbi__pic_load_core(Xstbi__context *s,int width,int height,int *comp, Xstbi_uc *result) -{ - int act_comp=0,num_packets=0,y,chained; - Xstbi__pic_packet packets[10]; - - // this will (should...) cater for even some bizarre stuff like having data - // for the same channel in multiple packets. - do { - Xstbi__pic_packet *packet; - - if (num_packets==sizeof(packets)/sizeof(packets[0])) - return Xstbi__errpuc("bad format","too many packets"); - - packet = &packets[num_packets++]; - - chained = Xstbi__get8(s); - packet->size = Xstbi__get8(s); - packet->type = Xstbi__get8(s); - packet->channel = Xstbi__get8(s); - - act_comp |= packet->channel; - - if (Xstbi__at_eof(s)) return Xstbi__errpuc("bad file","file too short (reading packets)"); - if (packet->size != 8) return Xstbi__errpuc("bad format","packet isn't 8bpp"); - } while (chained); - - *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel? - - for(y=0; ytype) { - default: - return Xstbi__errpuc("bad format","packet has bad compression type"); - - case 0: {//uncompressed - int x; - - for(x=0;xchannel,dest)) - return 0; - break; - } - - case 1://Pure RLE - { - int left=width, i; - - while (left>0) { - Xstbi_uc count,value[4]; - - count=Xstbi__get8(s); - if (Xstbi__at_eof(s)) return Xstbi__errpuc("bad file","file too short (pure read count)"); - - if (count > left) - count = (Xstbi_uc) left; - - if (!Xstbi__readval(s,packet->channel,value)) return 0; - - for(i=0; ichannel,dest,value); - left -= count; - } - } - break; - - case 2: {//Mixed RLE - int left=width; - while (left>0) { - int count = Xstbi__get8(s), i; - if (Xstbi__at_eof(s)) return Xstbi__errpuc("bad file","file too short (mixed read count)"); - - if (count >= 128) { // Repeated - Xstbi_uc value[4]; - - if (count==128) - count = Xstbi__get16be(s); - else - count -= 127; - if (count > left) - return Xstbi__errpuc("bad file","scanline overrun"); - - if (!Xstbi__readval(s,packet->channel,value)) - return 0; - - for(i=0;ichannel,dest,value); - } else { // Raw - ++count; - if (count>left) return Xstbi__errpuc("bad file","scanline overrun"); - - for(i=0;ichannel,dest)) - return 0; - } - left-=count; - } - break; - } - } - } - } - - return result; -} - -static void *Xstbi__pic_load(Xstbi__context *s,int *px,int *py,int *comp,int req_comp, Xstbi__result_info *ri) -{ - Xstbi_uc *result; - int i, x,y; - STBI_NOTUSED(ri); - - for (i=0; i<92; ++i) - Xstbi__get8(s); - - x = Xstbi__get16be(s); - y = Xstbi__get16be(s); - if (Xstbi__at_eof(s)) return Xstbi__errpuc("bad file","file too short (pic header)"); - if (!Xstbi__mad3sizes_valid(x, y, 4, 0)) return Xstbi__errpuc("too large", "PIC image too large to decode"); - - Xstbi__get32be(s); //skip `ratio' - Xstbi__get16be(s); //skip `fields' - Xstbi__get16be(s); //skip `pad' - - // intermediate buffer is RGBA - result = (Xstbi_uc *) Xstbi__malloc_mad3(x, y, 4, 0); - memset(result, 0xff, x*y*4); - - if (!Xstbi__pic_load_core(s,x,y,comp, result)) { - STBI_FREE(result); - result=0; - } - *px = x; - *py = y; - if (req_comp == 0) req_comp = *comp; - result=Xstbi__convert_format(result,4,req_comp,x,y); - - return result; -} - -static int Xstbi__pic_test(Xstbi__context *s) -{ - int r = Xstbi__pic_test_core(s); - Xstbi__rewind(s); - return r; -} -#endif - -// ************************************************************************************************* -// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb - -#ifndef STBI_NO_GIF -typedef struct -{ - Xstbi__int16 prefix; - Xstbi_uc first; - Xstbi_uc suffix; -} Xstbi__gif_lzw; - -typedef struct -{ - int w,h; - Xstbi_uc *out, *old_out; // output buffer (always 4 components) - int flags, bgindex, ratio, transparent, eflags, delay; - Xstbi_uc pal[256][4]; - Xstbi_uc lpal[256][4]; - Xstbi__gif_lzw codes[4096]; - Xstbi_uc *color_table; - int parse, step; - int lflags; - int start_x, start_y; - int max_x, max_y; - int cur_x, cur_y; - int line_size; -} Xstbi__gif; - -static int Xstbi__gif_test_raw(Xstbi__context *s) -{ - int sz; - if (Xstbi__get8(s) != 'G' || Xstbi__get8(s) != 'I' || Xstbi__get8(s) != 'F' || Xstbi__get8(s) != '8') return 0; - sz = Xstbi__get8(s); - if (sz != '9' && sz != '7') return 0; - if (Xstbi__get8(s) != 'a') return 0; - return 1; -} - -static int Xstbi__gif_test(Xstbi__context *s) -{ - int r = Xstbi__gif_test_raw(s); - Xstbi__rewind(s); - return r; -} - -static void Xstbi__gif_parse_colortable(Xstbi__context *s, Xstbi_uc pal[256][4], int num_entries, int transp) -{ - int i; - for (i=0; i < num_entries; ++i) { - pal[i][2] = Xstbi__get8(s); - pal[i][1] = Xstbi__get8(s); - pal[i][0] = Xstbi__get8(s); - pal[i][3] = transp == i ? 0 : 255; - } -} - -static int Xstbi__gif_header(Xstbi__context *s, Xstbi__gif *g, int *comp, int is_info) -{ - Xstbi_uc version; - if (Xstbi__get8(s) != 'G' || Xstbi__get8(s) != 'I' || Xstbi__get8(s) != 'F' || Xstbi__get8(s) != '8') - return Xstbi__err("not GIF", "Corrupt GIF"); - - version = Xstbi__get8(s); - if (version != '7' && version != '9') return Xstbi__err("not GIF", "Corrupt GIF"); - if (Xstbi__get8(s) != 'a') return Xstbi__err("not GIF", "Corrupt GIF"); - - Xstbi__g_failure_reason = ""; - g->w = Xstbi__get16le(s); - g->h = Xstbi__get16le(s); - g->flags = Xstbi__get8(s); - g->bgindex = Xstbi__get8(s); - g->ratio = Xstbi__get8(s); - g->transparent = -1; - - if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments - - if (is_info) return 1; - - if (g->flags & 0x80) - Xstbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1); - - return 1; -} - -static int Xstbi__gif_info_raw(Xstbi__context *s, int *x, int *y, int *comp) -{ - Xstbi__gif* g = (Xstbi__gif*) Xstbi__malloc(sizeof(Xstbi__gif)); - if (!Xstbi__gif_header(s, g, comp, 1)) { - STBI_FREE(g); - Xstbi__rewind( s ); - return 0; - } - if (x) *x = g->w; - if (y) *y = g->h; - STBI_FREE(g); - return 1; -} - -static void Xstbi__out_gif_code(Xstbi__gif *g, Xstbi__uint16 code) -{ - Xstbi_uc *p, *c; - - // recurse to decode the prefixes, since the linked-list is backwards, - // and working backwards through an interleaved image would be nasty - if (g->codes[code].prefix >= 0) - Xstbi__out_gif_code(g, g->codes[code].prefix); - - if (g->cur_y >= g->max_y) return; - - p = &g->out[g->cur_x + g->cur_y]; - c = &g->color_table[g->codes[code].suffix * 4]; - - if (c[3] >= 128) { - p[0] = c[2]; - p[1] = c[1]; - p[2] = c[0]; - p[3] = c[3]; - } - g->cur_x += 4; - - if (g->cur_x >= g->max_x) { - g->cur_x = g->start_x; - g->cur_y += g->step; - - while (g->cur_y >= g->max_y && g->parse > 0) { - g->step = (1 << g->parse) * g->line_size; - g->cur_y = g->start_y + (g->step >> 1); - --g->parse; - } - } -} - -static Xstbi_uc *Xstbi__process_gif_raster(Xstbi__context *s, Xstbi__gif *g) -{ - Xstbi_uc lzw_cs; - Xstbi__int32 len, init_code; - Xstbi__uint32 first; - Xstbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear; - Xstbi__gif_lzw *p; - - lzw_cs = Xstbi__get8(s); - if (lzw_cs > 12) return NULL; - clear = 1 << lzw_cs; - first = 1; - codesize = lzw_cs + 1; - codemask = (1 << codesize) - 1; - bits = 0; - valid_bits = 0; - for (init_code = 0; init_code < clear; init_code++) { - g->codes[init_code].prefix = -1; - g->codes[init_code].first = (Xstbi_uc) init_code; - g->codes[init_code].suffix = (Xstbi_uc) init_code; - } - - // support no starting clear code - avail = clear+2; - oldcode = -1; - - len = 0; - for(;;) { - if (valid_bits < codesize) { - if (len == 0) { - len = Xstbi__get8(s); // start new block - if (len == 0) - return g->out; - } - --len; - bits |= (Xstbi__int32) Xstbi__get8(s) << valid_bits; - valid_bits += 8; - } else { - Xstbi__int32 code = bits & codemask; - bits >>= codesize; - valid_bits -= codesize; - // @OPTIMIZE: is there some way we can accelerate the non-clear path? - if (code == clear) { // clear code - codesize = lzw_cs + 1; - codemask = (1 << codesize) - 1; - avail = clear + 2; - oldcode = -1; - first = 0; - } else if (code == clear + 1) { // end of stream code - Xstbi__skip(s, len); - while ((len = Xstbi__get8(s)) > 0) - Xstbi__skip(s,len); - return g->out; - } else if (code <= avail) { - if (first) return Xstbi__errpuc("no clear code", "Corrupt GIF"); - - if (oldcode >= 0) { - p = &g->codes[avail++]; - if (avail > 4096) return Xstbi__errpuc("too many codes", "Corrupt GIF"); - p->prefix = (Xstbi__int16) oldcode; - p->first = g->codes[oldcode].first; - p->suffix = (code == avail) ? p->first : g->codes[code].first; - } else if (code == avail) - return Xstbi__errpuc("illegal code in raster", "Corrupt GIF"); - - Xstbi__out_gif_code(g, (Xstbi__uint16) code); - - if ((avail & codemask) == 0 && avail <= 0x0FFF) { - codesize++; - codemask = (1 << codesize) - 1; - } - - oldcode = code; - } else { - return Xstbi__errpuc("illegal code in raster", "Corrupt GIF"); - } - } - } -} - -static void Xstbi__fill_gif_background(Xstbi__gif *g, int x0, int y0, int x1, int y1) -{ - int x, y; - Xstbi_uc *c = g->pal[g->bgindex]; - for (y = y0; y < y1; y += 4 * g->w) { - for (x = x0; x < x1; x += 4) { - Xstbi_uc *p = &g->out[y + x]; - p[0] = c[2]; - p[1] = c[1]; - p[2] = c[0]; - p[3] = 0; - } - } -} - -// this function is designed to support animated gifs, although stb_image doesn't support it -static Xstbi_uc *Xstbi__gif_load_next(Xstbi__context *s, Xstbi__gif *g, int *comp, int req_comp) -{ - int i; - Xstbi_uc *prev_out = 0; - - if (g->out == 0 && !Xstbi__gif_header(s, g, comp,0)) - return 0; // Xstbi__g_failure_reason set by Xstbi__gif_header - - if (!Xstbi__mad3sizes_valid(g->w, g->h, 4, 0)) - return Xstbi__errpuc("too large", "GIF too large"); - - prev_out = g->out; - g->out = (Xstbi_uc *) Xstbi__malloc_mad3(4, g->w, g->h, 0); - if (g->out == 0) return Xstbi__errpuc("outofmem", "Out of memory"); - - switch ((g->eflags & 0x1C) >> 2) { - case 0: // unspecified (also always used on 1st frame) - Xstbi__fill_gif_background(g, 0, 0, 4 * g->w, 4 * g->w * g->h); - break; - case 1: // do not dispose - if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h); - g->old_out = prev_out; - break; - case 2: // dispose to background - if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h); - Xstbi__fill_gif_background(g, g->start_x, g->start_y, g->max_x, g->max_y); - break; - case 3: // dispose to previous - if (g->old_out) { - for (i = g->start_y; i < g->max_y; i += 4 * g->w) - memcpy(&g->out[i + g->start_x], &g->old_out[i + g->start_x], g->max_x - g->start_x); - } - break; - } - - for (;;) { - switch (Xstbi__get8(s)) { - case 0x2C: /* Image Descriptor */ - { - int prev_trans = -1; - Xstbi__int32 x, y, w, h; - Xstbi_uc *o; - - x = Xstbi__get16le(s); - y = Xstbi__get16le(s); - w = Xstbi__get16le(s); - h = Xstbi__get16le(s); - if (((x + w) > (g->w)) || ((y + h) > (g->h))) - return Xstbi__errpuc("bad Image Descriptor", "Corrupt GIF"); - - g->line_size = g->w * 4; - g->start_x = x * 4; - g->start_y = y * g->line_size; - g->max_x = g->start_x + w * 4; - g->max_y = g->start_y + h * g->line_size; - g->cur_x = g->start_x; - g->cur_y = g->start_y; - - g->lflags = Xstbi__get8(s); - - if (g->lflags & 0x40) { - g->step = 8 * g->line_size; // first interlaced spacing - g->parse = 3; - } else { - g->step = g->line_size; - g->parse = 0; - } - - if (g->lflags & 0x80) { - Xstbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1); - g->color_table = (Xstbi_uc *) g->lpal; - } else if (g->flags & 0x80) { - if (g->transparent >= 0 && (g->eflags & 0x01)) { - prev_trans = g->pal[g->transparent][3]; - g->pal[g->transparent][3] = 0; - } - g->color_table = (Xstbi_uc *) g->pal; - } else - return Xstbi__errpuc("missing color table", "Corrupt GIF"); - - o = Xstbi__process_gif_raster(s, g); - if (o == NULL) return NULL; - - if (prev_trans != -1) - g->pal[g->transparent][3] = (Xstbi_uc) prev_trans; - - return o; - } - - case 0x21: // Comment Extension. - { - int len; - if (Xstbi__get8(s) == 0xF9) { // Graphic Control Extension. - len = Xstbi__get8(s); - if (len == 4) { - g->eflags = Xstbi__get8(s); - g->delay = Xstbi__get16le(s); - g->transparent = Xstbi__get8(s); - } else { - Xstbi__skip(s, len); - break; - } - } - while ((len = Xstbi__get8(s)) != 0) - Xstbi__skip(s, len); - break; - } - - case 0x3B: // gif stream termination code - return (Xstbi_uc *) s; // using '1' causes warning on some compilers - - default: - return Xstbi__errpuc("unknown code", "Corrupt GIF"); - } - } - - STBI_NOTUSED(req_comp); -} - -static void *Xstbi__gif_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri) -{ - Xstbi_uc *u = 0; - Xstbi__gif* g = (Xstbi__gif*) Xstbi__malloc(sizeof(Xstbi__gif)); - memset(g, 0, sizeof(*g)); - STBI_NOTUSED(ri); - - u = Xstbi__gif_load_next(s, g, comp, req_comp); - if (u == (Xstbi_uc *) s) u = 0; // end of animated gif marker - if (u) { - *x = g->w; - *y = g->h; - if (req_comp && req_comp != 4) - u = Xstbi__convert_format(u, 4, req_comp, g->w, g->h); - } - else if (g->out) - STBI_FREE(g->out); - STBI_FREE(g); - return u; -} - -static int Xstbi__gif_info(Xstbi__context *s, int *x, int *y, int *comp) -{ - return Xstbi__gif_info_raw(s,x,y,comp); -} -#endif - -// ************************************************************************************************* -// Radiance RGBE HDR loader -// originally by Nicolas Schulz -#ifndef STBI_NO_HDR -static int Xstbi__hdr_test_core(Xstbi__context *s, const char *signature) -{ - int i; - for (i=0; signature[i]; ++i) - if (Xstbi__get8(s) != signature[i]) - return 0; - Xstbi__rewind(s); - return 1; -} - -static int Xstbi__hdr_test(Xstbi__context* s) -{ - int r = Xstbi__hdr_test_core(s, "#?RADIANCE\n"); - Xstbi__rewind(s); - if(!r) { - r = Xstbi__hdr_test_core(s, "#?RGBE\n"); - Xstbi__rewind(s); - } - return r; -} - -#define STBI__HDR_BUFLEN 1024 -static char *Xstbi__hdr_gettoken(Xstbi__context *z, char *buffer) -{ - int len=0; - char c = '\0'; - - c = (char) Xstbi__get8(z); - - while (!Xstbi__at_eof(z) && c != '\n') { - buffer[len++] = c; - if (len == STBI__HDR_BUFLEN-1) { - // flush to end of line - while (!Xstbi__at_eof(z) && Xstbi__get8(z) != '\n') - ; - break; - } - c = (char) Xstbi__get8(z); - } - - buffer[len] = 0; - return buffer; -} - -static void Xstbi__hdr_convert(float *output, Xstbi_uc *input, int req_comp) -{ - if ( input[3] != 0 ) { - float f1; - // Exponent - f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8)); - if (req_comp <= 2) - output[0] = (input[0] + input[1] + input[2]) * f1 / 3; - else { - output[0] = input[0] * f1; - output[1] = input[1] * f1; - output[2] = input[2] * f1; - } - if (req_comp == 2) output[1] = 1; - if (req_comp == 4) output[3] = 1; - } else { - switch (req_comp) { - case 4: output[3] = 1; /* fallthrough */ - case 3: output[0] = output[1] = output[2] = 0; - break; - case 2: output[1] = 1; /* fallthrough */ - case 1: output[0] = 0; - break; - } - } -} - -static float *Xstbi__hdr_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri) -{ - char buffer[STBI__HDR_BUFLEN]; - char *token; - int valid = 0; - int width, height; - Xstbi_uc *scanline; - float *hdr_data; - int len; - unsigned char count, value; - int i, j, k, c1,c2, z; - const char *headerToken; - STBI_NOTUSED(ri); - - // Check identifier - headerToken = Xstbi__hdr_gettoken(s,buffer); - if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0) - return Xstbi__errpf("not HDR", "Corrupt HDR image"); - - // Parse header - for(;;) { - token = Xstbi__hdr_gettoken(s,buffer); - if (token[0] == 0) break; - if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; - } - - if (!valid) return Xstbi__errpf("unsupported format", "Unsupported HDR format"); - - // Parse width and height - // can't use sscanf() if we're not using stdio! - token = Xstbi__hdr_gettoken(s,buffer); - if (strncmp(token, "-Y ", 3)) return Xstbi__errpf("unsupported data layout", "Unsupported HDR format"); - token += 3; - height = (int) strtol(token, &token, 10); - while (*token == ' ') ++token; - if (strncmp(token, "+X ", 3)) return Xstbi__errpf("unsupported data layout", "Unsupported HDR format"); - token += 3; - width = (int) strtol(token, NULL, 10); - - *x = width; - *y = height; - - if (comp) *comp = 3; - if (req_comp == 0) req_comp = 3; - - if (!Xstbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0)) - return Xstbi__errpf("too large", "HDR image is too large"); - - // Read data - hdr_data = (float *) Xstbi__malloc_mad4(width, height, req_comp, sizeof(float), 0); - if (!hdr_data) - return Xstbi__errpf("outofmem", "Out of memory"); - - // Load image data - // image data is stored as some number of sca - if ( width < 8 || width >= 32768) { - // Read flat data - for (j=0; j < height; ++j) { - for (i=0; i < width; ++i) { - Xstbi_uc rgbe[4]; - main_decode_loop: - Xstbi__getn(s, rgbe, 4); - Xstbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp); - } - } - } else { - // Read RLE-encoded data - scanline = NULL; - - for (j = 0; j < height; ++j) { - c1 = Xstbi__get8(s); - c2 = Xstbi__get8(s); - len = Xstbi__get8(s); - if (c1 != 2 || c2 != 2 || (len & 0x80)) { - // not run-length encoded, so we have to actually use THIS data as a decoded - // pixel (note this can't be a valid pixel--one of RGB must be >= 128) - Xstbi_uc rgbe[4]; - rgbe[0] = (Xstbi_uc) c1; - rgbe[1] = (Xstbi_uc) c2; - rgbe[2] = (Xstbi_uc) len; - rgbe[3] = (Xstbi_uc) Xstbi__get8(s); - Xstbi__hdr_convert(hdr_data, rgbe, req_comp); - i = 1; - j = 0; - STBI_FREE(scanline); - goto main_decode_loop; // yes, this makes no sense - } - len <<= 8; - len |= Xstbi__get8(s); - if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return Xstbi__errpf("invalid decoded scanline length", "corrupt HDR"); } - if (scanline == NULL) { - scanline = (Xstbi_uc *) Xstbi__malloc_mad2(width, 4, 0); - if (!scanline) { - STBI_FREE(hdr_data); - return Xstbi__errpf("outofmem", "Out of memory"); - } - } - - for (k = 0; k < 4; ++k) { - int nleft; - i = 0; - while ((nleft = width - i) > 0) { - count = Xstbi__get8(s); - if (count > 128) { - // Run - value = Xstbi__get8(s); - count -= 128; - if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return Xstbi__errpf("corrupt", "bad RLE data in HDR"); } - for (z = 0; z < count; ++z) - scanline[i++ * 4 + k] = value; - } else { - // Dump - if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return Xstbi__errpf("corrupt", "bad RLE data in HDR"); } - for (z = 0; z < count; ++z) - scanline[i++ * 4 + k] = Xstbi__get8(s); - } - } - } - for (i=0; i < width; ++i) - Xstbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp); - } - if (scanline) - STBI_FREE(scanline); - } - - return hdr_data; -} - -static int Xstbi__hdr_info(Xstbi__context *s, int *x, int *y, int *comp) -{ - char buffer[STBI__HDR_BUFLEN]; - char *token; - int valid = 0; - - if (Xstbi__hdr_test(s) == 0) { - Xstbi__rewind( s ); - return 0; - } - - for(;;) { - token = Xstbi__hdr_gettoken(s,buffer); - if (token[0] == 0) break; - if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; - } - - if (!valid) { - Xstbi__rewind( s ); - return 0; - } - token = Xstbi__hdr_gettoken(s,buffer); - if (strncmp(token, "-Y ", 3)) { - Xstbi__rewind( s ); - return 0; - } - token += 3; - *y = (int) strtol(token, &token, 10); - while (*token == ' ') ++token; - if (strncmp(token, "+X ", 3)) { - Xstbi__rewind( s ); - return 0; - } - token += 3; - *x = (int) strtol(token, NULL, 10); - *comp = 3; - return 1; -} -#endif // STBI_NO_HDR - -#ifndef STBI_NO_BMP -static int Xstbi__bmp_info(Xstbi__context *s, int *x, int *y, int *comp) -{ - void *p; - Xstbi__bmp_data info; - - info.all_a = 255; - p = Xstbi__bmp_parse_header(s, &info); - Xstbi__rewind( s ); - if (p == NULL) - return 0; - *x = s->img_x; - *y = s->img_y; - *comp = info.ma ? 4 : 3; - return 1; -} -#endif - -#ifndef STBI_NO_PSD -static int Xstbi__psd_info(Xstbi__context *s, int *x, int *y, int *comp) -{ - int channelCount; - if (Xstbi__get32be(s) != 0x38425053) { - Xstbi__rewind( s ); - return 0; - } - if (Xstbi__get16be(s) != 1) { - Xstbi__rewind( s ); - return 0; - } - Xstbi__skip(s, 6); - channelCount = Xstbi__get16be(s); - if (channelCount < 0 || channelCount > 16) { - Xstbi__rewind( s ); - return 0; - } - *y = Xstbi__get32be(s); - *x = Xstbi__get32be(s); - if (Xstbi__get16be(s) != 8) { - Xstbi__rewind( s ); - return 0; - } - if (Xstbi__get16be(s) != 3) { - Xstbi__rewind( s ); - return 0; - } - *comp = 4; - return 1; -} -#endif - -#ifndef STBI_NO_PIC -static int Xstbi__pic_info(Xstbi__context *s, int *x, int *y, int *comp) -{ - int act_comp=0,num_packets=0,chained; - Xstbi__pic_packet packets[10]; - - if (!Xstbi__pic_is4(s,"\x53\x80\xF6\x34")) { - Xstbi__rewind(s); - return 0; - } - - Xstbi__skip(s, 88); - - *x = Xstbi__get16be(s); - *y = Xstbi__get16be(s); - if (Xstbi__at_eof(s)) { - Xstbi__rewind( s); - return 0; - } - if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) { - Xstbi__rewind( s ); - return 0; - } - - Xstbi__skip(s, 8); - - do { - Xstbi__pic_packet *packet; - - if (num_packets==sizeof(packets)/sizeof(packets[0])) - return 0; - - packet = &packets[num_packets++]; - chained = Xstbi__get8(s); - packet->size = Xstbi__get8(s); - packet->type = Xstbi__get8(s); - packet->channel = Xstbi__get8(s); - act_comp |= packet->channel; - - if (Xstbi__at_eof(s)) { - Xstbi__rewind( s ); - return 0; - } - if (packet->size != 8) { - Xstbi__rewind( s ); - return 0; - } - } while (chained); - - *comp = (act_comp & 0x10 ? 4 : 3); - - return 1; -} -#endif - -// ************************************************************************************************* -// Portable Gray Map and Portable Pixel Map loader -// by Ken Miller -// -// PGM: http://netpbm.sourceforge.net/doc/pgm.html -// PPM: http://netpbm.sourceforge.net/doc/ppm.html -// -// Known limitations: -// Does not support comments in the header section -// Does not support ASCII image data (formats P2 and P3) -// Does not support 16-bit-per-channel - -#ifndef STBI_NO_PNM - -static int Xstbi__pnm_test(Xstbi__context *s) -{ - char p, t; - p = (char) Xstbi__get8(s); - t = (char) Xstbi__get8(s); - if (p != 'P' || (t != '5' && t != '6')) { - Xstbi__rewind( s ); - return 0; - } - return 1; -} - -static void *Xstbi__pnm_load(Xstbi__context *s, int *x, int *y, int *comp, int req_comp, Xstbi__result_info *ri) -{ - Xstbi_uc *out; - STBI_NOTUSED(ri); - - if (!Xstbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n)) - return 0; - - *x = s->img_x; - *y = s->img_y; - *comp = s->img_n; - - if (!Xstbi__mad3sizes_valid(s->img_n, s->img_x, s->img_y, 0)) - return Xstbi__errpuc("too large", "PNM too large"); - - out = (Xstbi_uc *) Xstbi__malloc_mad3(s->img_n, s->img_x, s->img_y, 0); - if (!out) return Xstbi__errpuc("outofmem", "Out of memory"); - Xstbi__getn(s, out, s->img_n * s->img_x * s->img_y); - - if (req_comp && req_comp != s->img_n) { - out = Xstbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y); - if (out == NULL) return out; // Xstbi__convert_format frees input on failure - } - return out; -} - -static int Xstbi__pnm_isspace(char c) -{ - return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r'; -} - -static void Xstbi__pnm_skip_whitespace(Xstbi__context *s, char *c) -{ - for (;;) { - while (!Xstbi__at_eof(s) && Xstbi__pnm_isspace(*c)) - *c = (char) Xstbi__get8(s); - - if (Xstbi__at_eof(s) || *c != '#') - break; - - while (!Xstbi__at_eof(s) && *c != '\n' && *c != '\r' ) - *c = (char) Xstbi__get8(s); - } -} - -static int Xstbi__pnm_isdigit(char c) -{ - return c >= '0' && c <= '9'; -} - -static int Xstbi__pnm_getinteger(Xstbi__context *s, char *c) -{ - int value = 0; - - while (!Xstbi__at_eof(s) && Xstbi__pnm_isdigit(*c)) { - value = value*10 + (*c - '0'); - *c = (char) Xstbi__get8(s); - } - - return value; -} - -static int Xstbi__pnm_info(Xstbi__context *s, int *x, int *y, int *comp) -{ - int maxv; - char c, p, t; - - Xstbi__rewind( s ); - - // Get identifier - p = (char) Xstbi__get8(s); - t = (char) Xstbi__get8(s); - if (p != 'P' || (t != '5' && t != '6')) { - Xstbi__rewind( s ); - return 0; - } - - *comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm - - c = (char) Xstbi__get8(s); - Xstbi__pnm_skip_whitespace(s, &c); - - *x = Xstbi__pnm_getinteger(s, &c); // read width - Xstbi__pnm_skip_whitespace(s, &c); - - *y = Xstbi__pnm_getinteger(s, &c); // read height - Xstbi__pnm_skip_whitespace(s, &c); - - maxv = Xstbi__pnm_getinteger(s, &c); // read max value - - if (maxv > 255) - return Xstbi__err("max value > 255", "PPM image not 8-bit"); - else - return 1; -} -#endif - -static int Xstbi__info_main(Xstbi__context *s, int *x, int *y, int *comp) -{ - #ifndef STBI_NO_JPEG - if (Xstbi__jpeg_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_PNG - if (Xstbi__png_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_GIF - if (Xstbi__gif_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_BMP - if (Xstbi__bmp_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_PSD - if (Xstbi__psd_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_PIC - if (Xstbi__pic_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_PNM - if (Xstbi__pnm_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_HDR - if (Xstbi__hdr_info(s, x, y, comp)) return 1; - #endif - - // test tga last because it's a crappy test! - #ifndef STBI_NO_TGA - if (Xstbi__tga_info(s, x, y, comp)) - return 1; - #endif - return Xstbi__err("unknown image type", "Image not of any known type, or corrupt"); -} - -#ifndef STBI_NO_STDIO -STBIDEF int Xstbi_info(char const *filename, int *x, int *y, int *comp) -{ - FILE *f = Xstbi__fopen(filename, "rb"); - int result; - if (!f) return Xstbi__err("can't fopen", "Unable to open file"); - result = Xstbi_info_from_file(f, x, y, comp); - fclose(f); - return result; -} - -STBIDEF int Xstbi_info_from_file(FILE *f, int *x, int *y, int *comp) -{ - int r; - Xstbi__context s; - long pos = ftell(f); - Xstbi__start_file(&s, f); - r = Xstbi__info_main(&s,x,y,comp); - fseek(f,pos,SEEK_SET); - return r; -} -#endif // !STBI_NO_STDIO - -STBIDEF int Xstbi_info_from_memory(Xstbi_uc const *buffer, int len, int *x, int *y, int *comp) -{ - Xstbi__context s; - Xstbi__start_mem(&s,buffer,len); - return Xstbi__info_main(&s,x,y,comp); -} - -STBIDEF int Xstbi_info_from_callbacks(Xstbi_io_callbacks const *c, void *user, int *x, int *y, int *comp) -{ - Xstbi__context s; - Xstbi__start_callbacks(&s, (Xstbi_io_callbacks *) c, user); - return Xstbi__info_main(&s,x,y,comp); -} - -#endif // STB_IMAGE_IMPLEMENTATION - -/* - revision history: - 2.13 (2016-11-29) add 16-bit API, only supported for PNG right now - 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes - 2.11 (2016-04-02) allocate large structures on the stack - remove white matting for transparent PSD - fix reported channel count for PNG & BMP - re-enable SSE2 in non-gcc 64-bit - support RGB-formatted JPEG - read 16-bit PNGs (only as 8-bit) - 2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED - 2.09 (2016-01-16) allow comments in PNM files - 16-bit-per-pixel TGA (not bit-per-component) - info() for TGA could break due to .hdr handling - info() for BMP to shares code instead of sloppy parse - can use STBI_REALLOC_SIZED if allocator doesn't support realloc - code cleanup - 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA - 2.07 (2015-09-13) fix compiler warnings - partial animated GIF support - limited 16-bpc PSD support - #ifdef unused functions - bug with < 92 byte PIC,PNM,HDR,TGA - 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value - 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning - 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit - 2.03 (2015-04-12) extra corruption checking (mmozeiko) - Xstbi_set_flip_vertically_on_load (nguillemot) - fix NEON support; fix mingw support - 2.02 (2015-01-19) fix incorrect assert, fix warning - 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2 - 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG - 2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) - progressive JPEG (stb) - PGM/PPM support (Ken Miller) - STBI_MALLOC,STBI_REALLOC,STBI_FREE - GIF bugfix -- seemingly never worked - STBI_NO_*, STBI_ONLY_* - 1.48 (2014-12-14) fix incorrectly-named assert() - 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb) - optimize PNG (ryg) - fix bug in interlaced PNG with user-specified channel count (stb) - 1.46 (2014-08-26) - fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG - 1.45 (2014-08-16) - fix MSVC-ARM internal compiler error by wrapping malloc - 1.44 (2014-08-07) - various warning fixes from Ronny Chevalier - 1.43 (2014-07-15) - fix MSVC-only compiler problem in code changed in 1.42 - 1.42 (2014-07-09) - don't define _CRT_SECURE_NO_WARNINGS (affects user code) - fixes to Xstbi__cleanup_jpeg path - added STBI_ASSERT to avoid requiring assert.h - 1.41 (2014-06-25) - fix search&replace from 1.36 that messed up comments/error messages - 1.40 (2014-06-22) - fix gcc struct-initialization warning - 1.39 (2014-06-15) - fix to TGA optimization when req_comp != number of components in TGA; - fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite) - add support for BMP version 5 (more ignored fields) - 1.38 (2014-06-06) - suppress MSVC warnings on integer casts truncating values - fix accidental rename of 'skip' field of I/O - 1.37 (2014-06-04) - remove duplicate typedef - 1.36 (2014-06-03) - convert to header file single-file library - if de-iphone isn't set, load iphone images color-swapped instead of returning NULL - 1.35 (2014-05-27) - various warnings - fix broken STBI_SIMD path - fix bug where Xstbi_load_from_file no longer left file pointer in correct place - fix broken non-easy path for 32-bit BMP (possibly never used) - TGA optimization by Arseny Kapoulkine - 1.34 (unknown) - use STBI_NOTUSED in Xstbi__resample_row_generic(), fix one more leak in tga failure case - 1.33 (2011-07-14) - make Xstbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements - 1.32 (2011-07-13) - support for "info" function for all supported filetypes (SpartanJ) - 1.31 (2011-06-20) - a few more leak fixes, bug in PNG handling (SpartanJ) - 1.30 (2011-06-11) - added ability to load files via callbacks to accomidate custom input streams (Ben Wenger) - removed deprecated format-specific test/load functions - removed support for installable file formats (Xstbi_loader) -- would have been broken for IO callbacks anyway - error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha) - fix inefficiency in decoding 32-bit BMP (David Woo) - 1.29 (2010-08-16) - various warning fixes from Aurelien Pocheville - 1.28 (2010-08-01) - fix bug in GIF palette transparency (SpartanJ) - 1.27 (2010-08-01) - cast-to-Xstbi_uc to fix warnings - 1.26 (2010-07-24) - fix bug in file buffering for PNG reported by SpartanJ - 1.25 (2010-07-17) - refix trans_data warning (Won Chun) - 1.24 (2010-07-12) - perf improvements reading from files on platforms with lock-heavy fgetc() - minor perf improvements for jpeg - deprecated type-specific functions so we'll get feedback if they're needed - attempt to fix trans_data warning (Won Chun) - 1.23 fixed bug in iPhone support - 1.22 (2010-07-10) - removed image *writing* support - Xstbi_info support from Jetro Lauha - GIF support from Jean-Marc Lienher - iPhone PNG-extensions from James Brown - warning-fixes from Nicolas Schulz and Janez Zemva (i.Xstbi__err. Janez (U+017D)emva) - 1.21 fix use of 'Xstbi_uc' in header (reported by jon blow) - 1.20 added support for Softimage PIC, by Tom Seddon - 1.19 bug in interlaced PNG corruption check (found by ryg) - 1.18 (2008-08-02) - fix a threading bug (local mutable static) - 1.17 support interlaced PNG - 1.16 major bugfix - Xstbi__convert_format converted one too many pixels - 1.15 initialize some fields for thread safety - 1.14 fix threadsafe conversion bug - header-file-only version (#define STBI_HEADER_FILE_ONLY before including) - 1.13 threadsafe - 1.12 const qualifiers in the API - 1.11 Support installable IDCT, colorspace conversion routines - 1.10 Fixes for 64-bit (don't use "unsigned long") - optimized upsampling by Fabian "ryg" Giesen - 1.09 Fix format-conversion for PSD code (bad global variables!) - 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz - 1.07 attempt to fix C++ warning/errors again - 1.06 attempt to fix C++ warning/errors again - 1.05 fix TGA loading to return correct *comp and use good luminance calc - 1.04 default float alpha is 1, not 255; use 'void *' for Xstbi_image_free - 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR - 1.02 support for (subset of) HDR files, float interface for preferred access to them - 1.01 fix bug: possible bug in handling right-side up bmps... not sure - fix bug: the Xstbi__bmp_load() and Xstbi__tga_load() functions didn't work at all - 1.00 interface to zlib that skips zlib header - 0.99 correct handling of alpha in palette - 0.98 TGA loader by lonesock; dynamically add loaders (untested) - 0.97 jpeg errors on too large a file; also catch another malloc failure - 0.96 fix detection of invalid v value - particleman@mollyrocket forum - 0.95 during header scan, seek to markers in case of padding - 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same - 0.93 handle jpegtran output; verbose errors - 0.92 read 4,8,16,24,32-bit BMP files of several formats - 0.91 output 24-bit Windows 3.0 BMP files - 0.90 fix a few more warnings; bump version number to approach 1.0 - 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd - 0.60 fix compiling as c++ - 0.59 fix warnings: merge Dave Moore's -Wall fixes - 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian - 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available - 0.56 fix bug: zlib uncompressed mode len vs. nlen - 0.55 fix bug: restart_interval not initialized to 0 - 0.54 allow NULL for 'int *comp' - 0.53 fix bug in png 3->4; speedup png decoding - 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments - 0.51 obey req_comp requests, 1-component jpegs return as 1-component, - on 'test' only check type, not whether we support this variant - 0.50 (2006-11-19) - first released version -*/ \ No newline at end of file diff --git a/qrcode/src/stb_image_write.h b/qrcode/src/stb_image_write.h deleted file mode 100644 index 96b7685..0000000 --- a/qrcode/src/stb_image_write.h +++ /dev/null @@ -1,1049 +0,0 @@ -/* stb_image_write - v1.03 - public domain - http://nothings.org/stb/stb_image_write.h - writes out PNG/BMP/TGA images to C stdio - Sean Barrett 2010-2015 - no warranty implied; use at your own risk - - Before #including, - - #define STB_IMAGE_WRITE_IMPLEMENTATION - - in the file that you want to have the implementation. - - Will probably not work correctly with strict-aliasing optimizations. - -ABOUT: - - This header file is a library for writing images to C stdio. It could be - adapted to write to memory or a general streaming interface; let me know. - - The PNG output is not optimal; it is 20-50% larger than the file - written by a decent optimizing implementation. This library is designed - for source code compactness and simplicity, not optimal image file size - or run-time performance. - -BUILDING: - - You can #define STBIW_ASSERT(x) before the #include to avoid using assert.h. - You can #define STBIW_MALLOC(), STBIW_REALLOC(), and STBIW_FREE() to replace - malloc,realloc,free. - You can define STBIW_MEMMOVE() to replace memmove() - -USAGE: - - There are four functions, one for each image file format: - - int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); - int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); - int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); - int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); - - There are also four equivalent functions that use an arbitrary write function. You are - expected to open/close your file-equivalent before and after calling these: - - int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data, int stride_in_bytes); - int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); - int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); - int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); - - where the callback is: - void stbi_write_func(void *context, void *data, int size); - - You can define STBI_WRITE_NO_STDIO to disable the file variant of these - functions, so the library will not use stdio.h at all. However, this will - also disable HDR writing, because it requires stdio for formatted output. - - Each function returns 0 on failure and non-0 on success. - - The functions create an image file defined by the parameters. The image - is a rectangle of pixels stored from left-to-right, top-to-bottom. - Each pixel contains 'comp' channels of data stored interleaved with 8-bits - per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is - monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall. - The *data pointer points to the first byte of the top-left-most pixel. - For PNG, "stride_in_bytes" is the distance in bytes from the first byte of - a row of pixels to the first byte of the next row of pixels. - - PNG creates output files with the same number of components as the input. - The BMP format expands Y to RGB in the file format and does not - output alpha. - - PNG supports writing rectangles of data even when the bytes storing rows of - data are not consecutive in memory (e.g. sub-rectangles of a larger image), - by supplying the stride between the beginning of adjacent rows. The other - formats do not. (Thus you cannot write a native-format BMP through the BMP - writer, both because it is in BGR order and because it may have padding - at the end of the line.) - - HDR expects linear float data. Since the format is always 32-bit rgb(e) - data, alpha (if provided) is discarded, and for monochrome data it is - replicated across all three channels. - - TGA supports RLE or non-RLE compressed data. To use non-RLE-compressed - data, set the global variable 'stbi_write_tga_with_rle' to 0. - -CREDITS: - - PNG/BMP/TGA - Sean Barrett - HDR - Baldur Karlsson - TGA monochrome: - Jean-Sebastien Guay - misc enhancements: - Tim Kelsey - TGA RLE - Alan Hickman - initial file IO callback implementation - Emmanuel Julien - bugfixes: - github:Chribba - Guillaume Chereau - github:jry2 - github:romigrou - Sergio Gonzalez - Jonas Karlsson - Filip Wasil - Thatcher Ulrich - github:poppolopoppo - -LICENSE - -This software is dual-licensed to the public domain and under the following -license: you are granted a perpetual, irrevocable license to copy, modify, -publish, and distribute this file as you see fit. - -*/ - -#ifndef INCLUDE_STB_IMAGE_WRITE_H -#define INCLUDE_STB_IMAGE_WRITE_H - -#ifdef __cplusplus -extern "C" { -#endif - -#ifdef STB_IMAGE_WRITE_STATIC -#define STBIWDEF static -#else -#define STBIWDEF extern -extern int stbi_write_tga_with_rle; -#endif - -#ifndef STBI_WRITE_NO_STDIO -STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); -STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); -STBIWDEF int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); -STBIWDEF int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); -#endif - -typedef void stbi_write_func(void *context, void *data, int size); - -STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data, int stride_in_bytes); -STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); -STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); -STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); - -#ifdef __cplusplus -} -#endif - -#endif//INCLUDE_STB_IMAGE_WRITE_H - -#ifdef STB_IMAGE_WRITE_IMPLEMENTATION - -#ifdef _WIN32 - #ifndef _CRT_SECURE_NO_WARNINGS - #define _CRT_SECURE_NO_WARNINGS - #endif - #ifndef _CRT_NONSTDC_NO_DEPRECATE - #define _CRT_NONSTDC_NO_DEPRECATE - #endif -#endif - -#ifndef STBI_WRITE_NO_STDIO -#include -#endif // STBI_WRITE_NO_STDIO - -#include -#include -#include -#include - -#if defined(STBIW_MALLOC) && defined(STBIW_FREE) && (defined(STBIW_REALLOC) || defined(STBIW_REALLOC_SIZED)) -// ok -#elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) && !defined(STBIW_REALLOC) && !defined(STBIW_REALLOC_SIZED) -// ok -#else -#error "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC (or STBIW_REALLOC_SIZED)." -#endif - -#ifndef STBIW_MALLOC -#define STBIW_MALLOC(sz) malloc(sz) -#define STBIW_REALLOC(p,newsz) realloc(p,newsz) -#define STBIW_FREE(p) free(p) -#endif - -#ifndef STBIW_REALLOC_SIZED -#define STBIW_REALLOC_SIZED(p,oldsz,newsz) STBIW_REALLOC(p,newsz) -#endif - - -#ifndef STBIW_MEMMOVE -#define STBIW_MEMMOVE(a,b,sz) memmove(a,b,sz) -#endif - - -#ifndef STBIW_ASSERT -#include -#define STBIW_ASSERT(x) assert(x) -#endif - -#define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff) - -typedef struct -{ - stbi_write_func *func; - void *context; -} stbi__write_context; - -// initialize a callback-based context -static void stbi__start_write_callbacks(stbi__write_context *s, stbi_write_func *c, void *context) -{ - s->func = c; - s->context = context; -} - -#ifndef STBI_WRITE_NO_STDIO - -static void stbi__stdio_write(void *context, void *data, int size) -{ - fwrite(data,1,size,(FILE*) context); -} - -static int stbi__start_write_file(stbi__write_context *s, const char *filename) -{ - FILE *f = fopen(filename, "wb"); - stbi__start_write_callbacks(s, stbi__stdio_write, (void *) f); - return f != NULL; -} - -static void stbi__end_write_file(stbi__write_context *s) -{ - fclose((FILE *)s->context); -} - -#endif // !STBI_WRITE_NO_STDIO - -typedef unsigned int stbiw_uint32; -typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1]; - -#ifdef STB_IMAGE_WRITE_STATIC -static int stbi_write_tga_with_rle = 1; -#else -int stbi_write_tga_with_rle = 1; -#endif - -static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_list v) -{ - while (*fmt) { - switch (*fmt++) { - case ' ': break; - case '1': { unsigned char x = STBIW_UCHAR(va_arg(v, int)); - s->func(s->context,&x,1); - break; } - case '2': { int x = va_arg(v,int); - unsigned char b[2]; - b[0] = STBIW_UCHAR(x); - b[1] = STBIW_UCHAR(x>>8); - s->func(s->context,b,2); - break; } - case '4': { stbiw_uint32 x = va_arg(v,int); - unsigned char b[4]; - b[0]=STBIW_UCHAR(x); - b[1]=STBIW_UCHAR(x>>8); - b[2]=STBIW_UCHAR(x>>16); - b[3]=STBIW_UCHAR(x>>24); - s->func(s->context,b,4); - break; } - default: - STBIW_ASSERT(0); - return; - } - } -} - -static void stbiw__writef(stbi__write_context *s, const char *fmt, ...) -{ - va_list v; - va_start(v, fmt); - stbiw__writefv(s, fmt, v); - va_end(v); -} - -static void stbiw__write3(stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c) -{ - unsigned char arr[3]; - arr[0] = a, arr[1] = b, arr[2] = c; - s->func(s->context, arr, 3); -} - -static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp, int write_alpha, int expand_mono, unsigned char *d) -{ - unsigned char bg[3] = { 255, 0, 255}, px[3]; - int k; - - if (write_alpha < 0) - s->func(s->context, &d[comp - 1], 1); - - switch (comp) { - case 1: - s->func(s->context,d,1); - break; - case 2: - if (expand_mono) - stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp - else - s->func(s->context, d, 1); // monochrome TGA - break; - case 4: - if (!write_alpha) { - // composite against pink background - for (k = 0; k < 3; ++k) - px[k] = bg[k] + ((d[k] - bg[k]) * d[3]) / 255; - stbiw__write3(s, px[1 - rgb_dir], px[1], px[1 + rgb_dir]); - break; - } - /* FALLTHROUGH */ - case 3: - stbiw__write3(s, d[1 - rgb_dir], d[1], d[1 + rgb_dir]); - break; - } - if (write_alpha > 0) - s->func(s->context, &d[comp - 1], 1); -} - -static void stbiw__write_pixels(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad, int expand_mono) -{ - stbiw_uint32 zero = 0; - int i,j, j_end; - - if (y <= 0) - return; - - if (vdir < 0) - j_end = -1, j = y-1; - else - j_end = y, j = 0; - - for (; j != j_end; j += vdir) { - for (i=0; i < x; ++i) { - unsigned char *d = (unsigned char *) data + (j*x+i)*comp; - stbiw__write_pixel(s, rgb_dir, comp, write_alpha, expand_mono, d); - } - s->func(s->context, &zero, scanline_pad); - } -} - -static int stbiw__outfile(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, int expand_mono, void *data, int alpha, int pad, const char *fmt, ...) -{ - if (y < 0 || x < 0) { - return 0; - } else { - va_list v; - va_start(v, fmt); - stbiw__writefv(s, fmt, v); - va_end(v); - stbiw__write_pixels(s,rgb_dir,vdir,x,y,comp,data,alpha,pad, expand_mono); - return 1; - } -} - -static int stbi_write_bmp_core(stbi__write_context *s, int x, int y, int comp, const void *data) -{ - int pad = (-x*3) & 3; - return stbiw__outfile(s,-1,-1,x,y,comp,1,(void *) data,0,pad, - "11 4 22 4" "4 44 22 444444", - 'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header - 40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header -} - -STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) -{ - stbi__write_context s; - stbi__start_write_callbacks(&s, func, context); - return stbi_write_bmp_core(&s, x, y, comp, data); -} - -#ifndef STBI_WRITE_NO_STDIO -STBIWDEF int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data) -{ - stbi__write_context s; - if (stbi__start_write_file(&s,filename)) { - int r = stbi_write_bmp_core(&s, x, y, comp, data); - stbi__end_write_file(&s); - return r; - } else - return 0; -} -#endif //!STBI_WRITE_NO_STDIO - -static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, void *data) -{ - int has_alpha = (comp == 2 || comp == 4); - int colorbytes = has_alpha ? comp-1 : comp; - int format = colorbytes < 2 ? 3 : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3 - - if (y < 0 || x < 0) - return 0; - - if (!stbi_write_tga_with_rle) { - return stbiw__outfile(s, -1, -1, x, y, comp, 0, (void *) data, has_alpha, 0, - "111 221 2222 11", 0, 0, format, 0, 0, 0, 0, 0, x, y, (colorbytes + has_alpha) * 8, has_alpha * 8); - } else { - int i,j,k; - - stbiw__writef(s, "111 221 2222 11", 0,0,format+8, 0,0,0, 0,0,x,y, (colorbytes + has_alpha) * 8, has_alpha * 8); - - for (j = y - 1; j >= 0; --j) { - unsigned char *row = (unsigned char *) data + j * x * comp; - int len; - - for (i = 0; i < x; i += len) { - unsigned char *begin = row + i * comp; - int diff = 1; - len = 1; - - if (i < x - 1) { - ++len; - diff = memcmp(begin, row + (i + 1) * comp, comp); - if (diff) { - const unsigned char *prev = begin; - for (k = i + 2; k < x && len < 128; ++k) { - if (memcmp(prev, row + k * comp, comp)) { - prev += comp; - ++len; - } else { - --len; - break; - } - } - } else { - for (k = i + 2; k < x && len < 128; ++k) { - if (!memcmp(begin, row + k * comp, comp)) { - ++len; - } else { - break; - } - } - } - } - - if (diff) { - unsigned char header = STBIW_UCHAR(len - 1); - s->func(s->context, &header, 1); - for (k = 0; k < len; ++k) { - stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin + k * comp); - } - } else { - unsigned char header = STBIW_UCHAR(len - 129); - s->func(s->context, &header, 1); - stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin); - } - } - } - } - return 1; -} - -int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) -{ - stbi__write_context s; - stbi__start_write_callbacks(&s, func, context); - return stbi_write_tga_core(&s, x, y, comp, (void *) data); -} - -#ifndef STBI_WRITE_NO_STDIO -int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data) -{ - stbi__write_context s; - if (stbi__start_write_file(&s,filename)) { - int r = stbi_write_tga_core(&s, x, y, comp, (void *) data); - stbi__end_write_file(&s); - return r; - } else - return 0; -} -#endif - -// ************************************************************************************************* -// Radiance RGBE HDR writer -// by Baldur Karlsson - -#define stbiw__max(a, b) ((a) > (b) ? (a) : (b)) - -void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear) -{ - int exponent; - float maxcomp = stbiw__max(linear[0], stbiw__max(linear[1], linear[2])); - - if (maxcomp < 1e-32f) { - rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0; - } else { - float normalize = (float) frexp(maxcomp, &exponent) * 256.0f/maxcomp; - - rgbe[0] = (unsigned char)(linear[0] * normalize); - rgbe[1] = (unsigned char)(linear[1] * normalize); - rgbe[2] = (unsigned char)(linear[2] * normalize); - rgbe[3] = (unsigned char)(exponent + 128); - } -} - -void stbiw__write_run_data(stbi__write_context *s, int length, unsigned char databyte) -{ - unsigned char lengthbyte = STBIW_UCHAR(length+128); - STBIW_ASSERT(length+128 <= 255); - s->func(s->context, &lengthbyte, 1); - s->func(s->context, &databyte, 1); -} - -void stbiw__write_dump_data(stbi__write_context *s, int length, unsigned char *data) -{ - unsigned char lengthbyte = STBIW_UCHAR(length); - STBIW_ASSERT(length <= 128); // inconsistent with spec but consistent with official code - s->func(s->context, &lengthbyte, 1); - s->func(s->context, data, length); -} - -void stbiw__write_hdr_scanline(stbi__write_context *s, int width, int ncomp, unsigned char *scratch, float *scanline) -{ - unsigned char scanlineheader[4] = { 2, 2, 0, 0 }; - unsigned char rgbe[4]; - float linear[3]; - int x; - - scanlineheader[2] = (width&0xff00)>>8; - scanlineheader[3] = (width&0x00ff); - - /* skip RLE for images too small or large */ - if (width < 8 || width >= 32768) { - for (x=0; x < width; x++) { - switch (ncomp) { - case 4: /* fallthrough */ - case 3: linear[2] = scanline[x*ncomp + 2]; - linear[1] = scanline[x*ncomp + 1]; - linear[0] = scanline[x*ncomp + 0]; - break; - default: - linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; - break; - } - stbiw__linear_to_rgbe(rgbe, linear); - s->func(s->context, rgbe, 4); - } - } else { - int c,r; - /* encode into scratch buffer */ - for (x=0; x < width; x++) { - switch(ncomp) { - case 4: /* fallthrough */ - case 3: linear[2] = scanline[x*ncomp + 2]; - linear[1] = scanline[x*ncomp + 1]; - linear[0] = scanline[x*ncomp + 0]; - break; - default: - linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; - break; - } - stbiw__linear_to_rgbe(rgbe, linear); - scratch[x + width*0] = rgbe[0]; - scratch[x + width*1] = rgbe[1]; - scratch[x + width*2] = rgbe[2]; - scratch[x + width*3] = rgbe[3]; - } - - s->func(s->context, scanlineheader, 4); - - /* RLE each component separately */ - for (c=0; c < 4; c++) { - unsigned char *comp = &scratch[width*c]; - - x = 0; - while (x < width) { - // find first run - r = x; - while (r+2 < width) { - if (comp[r] == comp[r+1] && comp[r] == comp[r+2]) - break; - ++r; - } - if (r+2 >= width) - r = width; - // dump up to first run - while (x < r) { - int len = r-x; - if (len > 128) len = 128; - stbiw__write_dump_data(s, len, &comp[x]); - x += len; - } - // if there's a run, output it - if (r+2 < width) { // same test as what we break out of in search loop, so only true if we break'd - // find next byte after run - while (r < width && comp[r] == comp[x]) - ++r; - // output run up to r - while (x < r) { - int len = r-x; - if (len > 127) len = 127; - stbiw__write_run_data(s, len, comp[x]); - x += len; - } - } - } - } - } -} - -static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp, float *data) -{ - if (y <= 0 || x <= 0 || data == NULL) - return 0; - else { - // Each component is stored separately. Allocate scratch space for full output scanline. - unsigned char *scratch = (unsigned char *) STBIW_MALLOC(x*4); - int i, len; - char buffer[128]; - char header[] = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n"; - s->func(s->context, header, sizeof(header)-1); - - len = sprintf(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x); - s->func(s->context, buffer, len); - - for(i=0; i < y; i++) - stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*i*x); - STBIW_FREE(scratch); - return 1; - } -} - -int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const float *data) -{ - stbi__write_context s; - stbi__start_write_callbacks(&s, func, context); - return stbi_write_hdr_core(&s, x, y, comp, (float *) data); -} - -#ifndef STBI_WRITE_NO_STDIO -int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data) -{ - stbi__write_context s; - if (stbi__start_write_file(&s,filename)) { - int r = stbi_write_hdr_core(&s, x, y, comp, (float *) data); - stbi__end_write_file(&s); - return r; - } else - return 0; -} -#endif // STBI_WRITE_NO_STDIO - - -////////////////////////////////////////////////////////////////////////////// -// -// PNG writer -// - -// stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size() -#define stbiw__sbraw(a) ((int *) (a) - 2) -#define stbiw__sbm(a) stbiw__sbraw(a)[0] -#define stbiw__sbn(a) stbiw__sbraw(a)[1] - -#define stbiw__sbneedgrow(a,n) ((a)==0 || stbiw__sbn(a)+n >= stbiw__sbm(a)) -#define stbiw__sbmaybegrow(a,n) (stbiw__sbneedgrow(a,(n)) ? stbiw__sbgrow(a,n) : 0) -#define stbiw__sbgrow(a,n) stbiw__sbgrowf((void **) &(a), (n), sizeof(*(a))) - -#define stbiw__sbpush(a, v) (stbiw__sbmaybegrow(a,1), (a)[stbiw__sbn(a)++] = (v)) -#define stbiw__sbcount(a) ((a) ? stbiw__sbn(a) : 0) -#define stbiw__sbfree(a) ((a) ? STBIW_FREE(stbiw__sbraw(a)),0 : 0) - -static void *stbiw__sbgrowf(void **arr, int increment, int itemsize) -{ - int m = *arr ? 2*stbiw__sbm(*arr)+increment : increment+1; - void *p = STBIW_REALLOC_SIZED(*arr ? stbiw__sbraw(*arr) : 0, *arr ? (stbiw__sbm(*arr)*itemsize + sizeof(int)*2) : 0, itemsize * m + sizeof(int)*2); - STBIW_ASSERT(p); - if (p) { - if (!*arr) ((int *) p)[1] = 0; - *arr = (void *) ((int *) p + 2); - stbiw__sbm(*arr) = m; - } - return *arr; -} - -static unsigned char *stbiw__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount) -{ - while (*bitcount >= 8) { - stbiw__sbpush(data, STBIW_UCHAR(*bitbuffer)); - *bitbuffer >>= 8; - *bitcount -= 8; - } - return data; -} - -static int stbiw__zlib_bitrev(int code, int codebits) -{ - int res=0; - while (codebits--) { - res = (res << 1) | (code & 1); - code >>= 1; - } - return res; -} - -static unsigned int stbiw__zlib_countm(unsigned char *a, unsigned char *b, int limit) -{ - int i; - for (i=0; i < limit && i < 258; ++i) - if (a[i] != b[i]) break; - return i; -} - -static unsigned int stbiw__zhash(unsigned char *data) -{ - stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16); - hash ^= hash << 3; - hash += hash >> 5; - hash ^= hash << 4; - hash += hash >> 17; - hash ^= hash << 25; - hash += hash >> 6; - return hash; -} - -#define stbiw__zlib_flush() (out = stbiw__zlib_flushf(out, &bitbuf, &bitcount)) -#define stbiw__zlib_add(code,codebits) \ - (bitbuf |= (code) << bitcount, bitcount += (codebits), stbiw__zlib_flush()) -#define stbiw__zlib_huffa(b,c) stbiw__zlib_add(stbiw__zlib_bitrev(b,c),c) -// default huffman tables -#define stbiw__zlib_huff1(n) stbiw__zlib_huffa(0x30 + (n), 8) -#define stbiw__zlib_huff2(n) stbiw__zlib_huffa(0x190 + (n)-144, 9) -#define stbiw__zlib_huff3(n) stbiw__zlib_huffa(0 + (n)-256,7) -#define stbiw__zlib_huff4(n) stbiw__zlib_huffa(0xc0 + (n)-280,8) -#define stbiw__zlib_huff(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : (n) <= 255 ? stbiw__zlib_huff2(n) : (n) <= 279 ? stbiw__zlib_huff3(n) : stbiw__zlib_huff4(n)) -#define stbiw__zlib_huffb(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : stbiw__zlib_huff2(n)) - -#define stbiw__ZHASH 16384 - -unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality) -{ - static unsigned short lengthc[] = { 3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258, 259 }; - static unsigned char lengtheb[]= { 0,0,0,0,0,0,0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0 }; - static unsigned short distc[] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577, 32768 }; - static unsigned char disteb[] = { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13 }; - unsigned int bitbuf=0; - int i,j, bitcount=0; - unsigned char *out = NULL; - unsigned char ***hash_table = (unsigned char***) STBIW_MALLOC(stbiw__ZHASH * sizeof(char**)); - if (quality < 5) quality = 5; - - stbiw__sbpush(out, 0x78); // DEFLATE 32K window - stbiw__sbpush(out, 0x5e); // FLEVEL = 1 - stbiw__zlib_add(1,1); // BFINAL = 1 - stbiw__zlib_add(1,2); // BTYPE = 1 -- fixed huffman - - for (i=0; i < stbiw__ZHASH; ++i) - hash_table[i] = NULL; - - i=0; - while (i < data_len-3) { - // hash next 3 bytes of data to be compressed - int h = stbiw__zhash(data+i)&(stbiw__ZHASH-1), best=3; - unsigned char *bestloc = 0; - unsigned char **hlist = hash_table[h]; - int n = stbiw__sbcount(hlist); - for (j=0; j < n; ++j) { - if (hlist[j]-data > i-32768) { // if entry lies within window - int d = stbiw__zlib_countm(hlist[j], data+i, data_len-i); - if (d >= best) best=d,bestloc=hlist[j]; - } - } - // when hash table entry is too long, delete half the entries - if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2*quality) { - STBIW_MEMMOVE(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality); - stbiw__sbn(hash_table[h]) = quality; - } - stbiw__sbpush(hash_table[h],data+i); - - if (bestloc) { - // "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal - h = stbiw__zhash(data+i+1)&(stbiw__ZHASH-1); - hlist = hash_table[h]; - n = stbiw__sbcount(hlist); - for (j=0; j < n; ++j) { - if (hlist[j]-data > i-32767) { - int e = stbiw__zlib_countm(hlist[j], data+i+1, data_len-i-1); - if (e > best) { // if next match is better, bail on current match - bestloc = NULL; - break; - } - } - } - } - - if (bestloc) { - int d = (int) (data+i - bestloc); // distance back - STBIW_ASSERT(d <= 32767 && best <= 258); - for (j=0; best > lengthc[j+1]-1; ++j); - stbiw__zlib_huff(j+257); - if (lengtheb[j]) stbiw__zlib_add(best - lengthc[j], lengtheb[j]); - for (j=0; d > distc[j+1]-1; ++j); - stbiw__zlib_add(stbiw__zlib_bitrev(j,5),5); - if (disteb[j]) stbiw__zlib_add(d - distc[j], disteb[j]); - i += best; - } else { - stbiw__zlib_huffb(data[i]); - ++i; - } - } - // write out final bytes - for (;i < data_len; ++i) - stbiw__zlib_huffb(data[i]); - stbiw__zlib_huff(256); // end of block - // pad with 0 bits to byte boundary - while (bitcount) - stbiw__zlib_add(0,1); - - for (i=0; i < stbiw__ZHASH; ++i) - (void) stbiw__sbfree(hash_table[i]); - STBIW_FREE(hash_table); - - { - // compute adler32 on input - unsigned int s1=1, s2=0; - int blocklen = (int) (data_len % 5552); - j=0; - while (j < data_len) { - for (i=0; i < blocklen; ++i) s1 += data[j+i], s2 += s1; - s1 %= 65521, s2 %= 65521; - j += blocklen; - blocklen = 5552; - } - stbiw__sbpush(out, STBIW_UCHAR(s2 >> 8)); - stbiw__sbpush(out, STBIW_UCHAR(s2)); - stbiw__sbpush(out, STBIW_UCHAR(s1 >> 8)); - stbiw__sbpush(out, STBIW_UCHAR(s1)); - } - *out_len = stbiw__sbn(out); - // make returned pointer freeable - STBIW_MEMMOVE(stbiw__sbraw(out), out, *out_len); - return (unsigned char *) stbiw__sbraw(out); -} - -static unsigned int stbiw__crc32(unsigned char *buffer, int len) -{ - static unsigned int crc_table[256] = - { - 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, - 0x0eDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, - 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, - 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, - 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, - 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, - 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, - 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, - 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, - 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, - 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, - 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, - 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, - 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, - 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, - 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, - 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, - 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, - 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, - 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, - 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, - 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, - 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, - 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, - 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, - 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, - 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, - 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, - 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, - 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, - 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, - 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D - }; - - unsigned int crc = ~0u; - int i; - for (i=0; i < len; ++i) - crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)]; - return ~crc; -} - -#define stbiw__wpng4(o,a,b,c,d) ((o)[0]=STBIW_UCHAR(a),(o)[1]=STBIW_UCHAR(b),(o)[2]=STBIW_UCHAR(c),(o)[3]=STBIW_UCHAR(d),(o)+=4) -#define stbiw__wp32(data,v) stbiw__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v)); -#define stbiw__wptag(data,s) stbiw__wpng4(data, s[0],s[1],s[2],s[3]) - -static void stbiw__wpcrc(unsigned char **data, int len) -{ - unsigned int crc = stbiw__crc32(*data - len - 4, len+4); - stbiw__wp32(*data, crc); -} - -static unsigned char stbiw__paeth(int a, int b, int c) -{ - int p = a + b - c, pa = abs(p-a), pb = abs(p-b), pc = abs(p-c); - if (pa <= pb && pa <= pc) return STBIW_UCHAR(a); - if (pb <= pc) return STBIW_UCHAR(b); - return STBIW_UCHAR(c); -} - -unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len) -{ - int ctype[5] = { -1, 0, 4, 2, 6 }; - unsigned char sig[8] = { 137,80,78,71,13,10,26,10 }; - unsigned char *out,*o, *filt, *zlib; - signed char *line_buffer; - int i,j,k,p,zlen; - - if (stride_bytes == 0) - stride_bytes = x * n; - - filt = (unsigned char *) STBIW_MALLOC((x*n+1) * y); if (!filt) return 0; - line_buffer = (signed char *) STBIW_MALLOC(x * n); if (!line_buffer) { STBIW_FREE(filt); return 0; } - for (j=0; j < y; ++j) { - static int mapping[] = { 0,1,2,3,4 }; - static int firstmap[] = { 0,1,0,5,6 }; - int *mymap = j ? mapping : firstmap; - int best = 0, bestval = 0x7fffffff; - for (p=0; p < 2; ++p) { - for (k= p?best:0; k < 5; ++k) { - int type = mymap[k],est=0; - unsigned char *z = pixels + stride_bytes*j; - for (i=0; i < n; ++i) - switch (type) { - case 0: line_buffer[i] = z[i]; break; - case 1: line_buffer[i] = z[i]; break; - case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break; - case 3: line_buffer[i] = z[i] - (z[i-stride_bytes]>>1); break; - case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-stride_bytes],0)); break; - case 5: line_buffer[i] = z[i]; break; - case 6: line_buffer[i] = z[i]; break; - } - for (i=n; i < x*n; ++i) { - switch (type) { - case 0: line_buffer[i] = z[i]; break; - case 1: line_buffer[i] = z[i] - z[i-n]; break; - case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break; - case 3: line_buffer[i] = z[i] - ((z[i-n] + z[i-stride_bytes])>>1); break; - case 4: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], z[i-stride_bytes], z[i-stride_bytes-n]); break; - case 5: line_buffer[i] = z[i] - (z[i-n]>>1); break; - case 6: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break; - } - } - if (p) break; - for (i=0; i < x*n; ++i) - est += abs((signed char) line_buffer[i]); - if (est < bestval) { bestval = est; best = k; } - } - } - // when we get here, best contains the filter type, and line_buffer contains the data - filt[j*(x*n+1)] = (unsigned char) best; - STBIW_MEMMOVE(filt+j*(x*n+1)+1, line_buffer, x*n); - } - STBIW_FREE(line_buffer); - zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, 8); // increase 8 to get smaller but use more memory - STBIW_FREE(filt); - if (!zlib) return 0; - - // each tag requires 12 bytes of overhead - out = (unsigned char *) STBIW_MALLOC(8 + 12+13 + 12+zlen + 12); - if (!out) return 0; - *out_len = 8 + 12+13 + 12+zlen + 12; - - o=out; - STBIW_MEMMOVE(o,sig,8); o+= 8; - stbiw__wp32(o, 13); // header length - stbiw__wptag(o, "IHDR"); - stbiw__wp32(o, x); - stbiw__wp32(o, y); - *o++ = 8; - *o++ = STBIW_UCHAR(ctype[n]); - *o++ = 0; - *o++ = 0; - *o++ = 0; - stbiw__wpcrc(&o,13); - - stbiw__wp32(o, zlen); - stbiw__wptag(o, "IDAT"); - STBIW_MEMMOVE(o, zlib, zlen); - o += zlen; - STBIW_FREE(zlib); - stbiw__wpcrc(&o, zlen); - - stbiw__wp32(o,0); - stbiw__wptag(o, "IEND"); - stbiw__wpcrc(&o,0); - - STBIW_ASSERT(o == out + *out_len); - - return out; -} - -#ifndef STBI_WRITE_NO_STDIO -STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes) -{ - FILE *f; - int len; - unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len); - if (png == NULL) return 0; - f = fopen(filename, "wb"); - if (!f) { STBIW_FREE(png); return 0; } - fwrite(png, 1, len, f); - fclose(f); - STBIW_FREE(png); - return 1; -} -#endif - -STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int stride_bytes) -{ - int len; - unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len); - if (png == NULL) return 0; - func(context, png, len); - STBIW_FREE(png); - return 1; -} - -#endif // STB_IMAGE_WRITE_IMPLEMENTATION - -/* Revision history - 1.02 (2016-04-02) - avoid allocating large structures on the stack - 1.01 (2016-01-16) - STBIW_REALLOC_SIZED: support allocators with no realloc support - avoid race-condition in crc initialization - minor compile issues - 1.00 (2015-09-14) - installable file IO function - 0.99 (2015-09-13) - warning fixes; TGA rle support - 0.98 (2015-04-08) - added STBIW_MALLOC, STBIW_ASSERT etc - 0.97 (2015-01-18) - fixed HDR asserts, rewrote HDR rle logic - 0.96 (2015-01-17) - add HDR output - fix monochrome BMP - 0.95 (2014-08-17) - add monochrome TGA output - 0.94 (2014-05-31) - rename private functions to avoid conflicts with stb_image.h - 0.93 (2014-05-27) - warning fixes - 0.92 (2010-08-01) - casts to unsigned char to fix warnings - 0.91 (2010-07-17) - first public release - 0.90 first internal release -*/ \ No newline at end of file diff --git a/screenshots/create.png b/screenshots/create.png new file mode 100644 index 0000000..35348c1 Binary files /dev/null and b/screenshots/create.png differ diff --git a/screenshots/scan.png b/screenshots/scan.png new file mode 100644 index 0000000..0368e79 Binary files /dev/null and b/screenshots/scan.png differ