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#define STBI_NO_STDIO #define STBI_NO_WRITE #define STBI_NO_HDR /* stbi-1.18 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c when you control the images you're loading QUICK NOTES: Primarily of interest to game developers and other people who can avoid problematic images and only need the trivial interface JPEG baseline (no JPEG progressive, no oddball channel decimations) PNG 8-bit only BMP non-1bpp, non-RLE TGA (not sure what subset, if a subset) PSD (composited view only, no extra channels) HDR (radiance rgbE format) writes BMP,TGA (define STBI_NO_WRITE to remove code) decoded from memory or through stdio FILE (define STBI_NO_STDIO to remove code) supports installable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD) TODO: stbi_info_* history: 1.18 fix a threading bug (local mutable static) 1.17 support interlaced PNG 1.16 major bugfix - 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 stbi_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 stbi_bmp_load() and stbi_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 */ #ifndef STBI_INCLUDE_STB_IMAGE_H #define STBI_INCLUDE_STB_IMAGE_H //// begin header file //////////////////////////////////////////////////// // // Limitations: // - no progressive/interlaced support (jpeg, png) // - 8-bit samples only (jpeg, png) // - not threadsafe // - channel subsampling of at most 2 in each dimension (jpeg) // - no delayed line count (jpeg) -- IJG doesn't support either // // Basic usage (see HDR discussion below): // int x,y,n; // unsigned char *data = stbi_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 // stbi_image_free(data) // // Standard parameters: // int *x -- outputs image width in pixels // int *y -- outputs image height in pixels // int *comp -- outputs # of image components in image file // int req_comp -- 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. 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 easily see if it's opaque. // // 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 stbi_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 and BMP images are automatically depalettized. // // // =========================================================================== // // 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: // // stbi_hdr_to_ldr_gamma(2.2f); // stbi_hdr_to_ldr_scale(1.0f); // // (note, do not use _inverse_ constants; stbi_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 = stbi_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: // // stbi_ldr_to_hdr_scale(1.0f); // stbi_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: // // stbi_is_hdr(char *filename); #ifndef STBI_NO_STDIO #include <stdio.h> #endif #define STBI_VERSION 1 enum { STBI_default = 0, // only used for req_comp STBI_grey