diff --git a/src/external/msf_gif.h b/src/external/msf_gif.h new file mode 100644 index 00000000..d258c12d --- /dev/null +++ b/src/external/msf_gif.h @@ -0,0 +1,565 @@ +/* +HOW TO USE: + + In exactly one translation unit (.c or .cpp file), #define MSF_GIF_IMPL before including the header, like so: + + #define MSF_GIF_IMPL + #include "msf_gif.h" + + Everywhere else, just include the header like normal. + + +USAGE EXAMPLE: + + int width = 480, height = 320, centisecondsPerFrame = 5, bitDepth = 16; + MsfGifState gifState = {}; + msf_gif_begin(&gifState, "example.gif", width, height); + msf_gif_frame(&gifState, ..., centisecondsPerFrame, bitDepth, width * 4); //frame 1 + msf_gif_frame(&gifState, ..., centisecondsPerFrame, bitDepth, width * 4); //frame 2 + msf_gif_frame(&gifState, ..., centisecondsPerFrame, bitDepth, width * 4); //frame 3, etc... + msf_gif_end(&gifState); + +Detailed function documentation can be found in the header section below. + +REPLACING MALLOC AND FWRITE: + + This library uses malloc+free internally for memory allocation and fopen+fwrite+fclose for file output. + To facilitate custom memory management and I/O, these calls go through macros, which can be redefined. + In order to replace them, simply #define the relevant macros in the same place where you #define MSF_GIF_IMPL. + The macros are: MSF_GIF_MALLOC, MSF_GIF_FREE, MSF_GIF_FOPEN, MSF_GIF_FWRITE, MSF_GIF_FCLOSE. + Search for their default definitions below to see the exactly what arguments they take. + If your allocator needs a context pointer, you can set the `customAllocatorContext` field of the MsfGifState struct + before calling msf_gif_begin(), and it will be passed to all subsequent allocator macro calls. + The same goes for file I/O macros, using the `customOutputContext` field. + +See end of file for license information. +*/ + +//version 1.2 + +#ifndef MSF_GIF_H +#define MSF_GIF_H + +#include +#include + +typedef struct { + uint32_t * pixels; + uint8_t * used; + int depth, count, rbits, gbits, bbits; +} MsfCookedFrame; + +typedef struct { + void * fp; + MsfCookedFrame previousFrame; + int width, height; + int totalBytesWritten; + void * customAllocatorContext; + void * customOutputContext; +} MsfGifState; + +#ifdef __cplusplus +extern "C" { +#endif //__cplusplus + +/** + * @param outputFilePath Relative path to the output file, as a null-terminated string of UTF-8 bytes. + * @param width Image width in pixels - must be the same for the whole gif. + * @param height Image height in pixels - must be the same for the whole gif. + * @return The size of the file written so far, or 0 on error. + */ +size_t msf_gif_begin(MsfGifState * handle, const char * outputFilePath, int width, int height); + +/** + * @param pixelData Pointer to raw framebuffer data. Rows must be contiguous in memory, in RGBA8 format. + * Note: This function does NOT free `pixelData`. You must free it yourself afterwards. + * @param centiSecondsPerFrame How many hundredths of a second this frame should be displayed for. + * Note: This being specified in centiseconds is a limitation of the GIF format. + * @param maxBitDepth Limits how many bits per pixel can be used when quantizing the gif. + * The actual bit depth chosen for a given frame will be less than or equal to + * the supplied maximum, depending on the variety of colors used in the frame. + * `maxBitDepth` will be clamped between 1 and 16. The recommended default is 16. + * Lowering this value can result in faster exports and smaller gifs, + * but the quality may suffer. + * Please experiment with this value to find what works best for your application. + * @param pitchInBytes The number of bytes from the beginning of one row of pixels to the beginning of the next. + * If you want to flip the image, just pass in a negative pitch. + * @return The size of the file written so far, or 0 on error. + */ +size_t msf_gif_frame(MsfGifState * handle, + uint8_t * pixelData, int centiSecondsPerFame, int maxBitDepth, int pitchInBytes); + +/** + * @return The size of the written file in bytes, or 0 on error. + */ +size_t msf_gif_end(MsfGifState * handle); + +#ifdef __cplusplus +} +#endif //__cplusplus + +#endif //MSF_GIF_H + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +/// IMPLEMENTATION /// +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// + +#ifdef MSF_GIF_IMPL +#ifndef MSF_GIF_ALREADY_IMPLEMENTED_IN_THIS_TRANSLATION_UNIT +#define MSF_GIF_ALREADY_IMPLEMENTED_IN_THIS_TRANSLATION_UNIT + +//ensure the library user has either defined both of malloc/free, or neither +#if defined(MSF_GIF_MALLOC) && defined(MSF_GIF_FREE) +#elif !defined(MSF_GIF_MALLOC) && !defined(MSF_GIF_FREE) +#else +#error "You must either define both MSF_GIF_MALLOC and MSF_GIF_FREE, or define neither of them" +#endif + +//provide default allocator definitions that redirect to the standard global allocator +#if !defined(MSF_GIF_MALLOC) +#include //malloc, etc. +#define MSF_GIF_MALLOC(contextPointer, newSize) malloc(newSize) +#define MSF_GIF_FREE(contextPointer, oldMemory, oldSize) free(oldMemory) +#endif + +//ensure the library user has either defined all of fopen/fwrite/fclose, or none +#if defined(MSF_GIF_FOPEN) && defined(MSF_GIF_FWRITE) && defined(MSF_GIF_FCLOSE) +#elif !defined(MSF_GIF_FOPEN) && !defined(MSF_GIF_FWRITE) && !defined(MSF_GIF_FCLOSE) +#else +#error "You must either define all of MSF_GIF_FOPEN, MSF_GIF_FWRITE, and MSF_GIF_FCLOSE, or define none of them" +#endif + +//provide default file ops that redirect to the standard library ones +#if !defined(MSF_GIF_FOPEN) +#include //FILE ops (fopen, etc.) +#define MSF_GIF_FOPEN(contextPointer, filePath) fopen(filePath, "wb") +#define MSF_GIF_FWRITE(contextPointer, filePointer, data, dataSize) fwrite(data, dataSize, 1, (FILE *) filePointer) +#define MSF_GIF_FCLOSE(contextPointer, filePointer) fclose((FILE *) filePointer) +#endif + +//instrumentation for capturing profiling traces (useless for the library user, but useful for the library author) +#ifdef MSF_GIF_ENABLE_TRACING +#define MsfTimeFunc TimeFunc +#define MsfTimeLoop TimeLoop +#define msf_init_profiling_thread init_profiling_thread +#else +#define MsfTimeFunc +#define MsfTimeLoop(name) +#define msf_init_profiling_thread() +#endif //MSF_GIF_ENABLE_TRACING + +#include //memcpy + +//TODO: use compiler-specific notation to force-inline functions currently marked inline +#if defined(__GNUC__) //gcc, clang +static inline int msf_bit_log(int i) { return 32 - __builtin_clz(i); } +#elif defined(_MSC_VER) //msvc +#include +static inline int msf_bit_log(int i) { unsigned long idx; _BitScanReverse(&idx, i); return idx + 1; } +#else //fallback implementation for other compilers +//from https://stackoverflow.com/a/31718095/3064745 - thanks! +static inline int msf_bit_log(int i) { + static const int MultiplyDeBruijnBitPosition[32] = { + 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, + 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31, + }; + i |= i >> 1; + i |= i >> 2; + i |= i >> 4; + i |= i >> 8; + i |= i >> 16; + return MultiplyDeBruijnBitPosition[(uint32_t)(i * 0x07C4ACDDU) >> 27] + 1; +} +#endif +static inline int msf_imin(int a, int b) { return a < b? a : b; } +static inline int msf_imax(int a, int b) { return b < a? a : b; } + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +/// Frame Cooking /// +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// + +#if (defined (__SSE2__) || defined (_M_X64) || _M_IX86_FP == 2) && !defined(MSF_GIF_NO_SSE2) +#include +#endif + +static const int msfUsedAllocSize = (1 << 16) * sizeof(uint8_t); + +static MsfCookedFrame msf_cook_frame(void * allocContext, int width, int height, int pitch, int depth, uint8_t * raw) +{ MsfTimeFunc + MsfCookedFrame blank = {0}; + + //bit depth for each channel + const static int rdepths[17] = { 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5 }; + const static int gdepths[17] = { 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5, 6 }; + const static int bdepths[17] = { 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5 }; + + const static int ditherKernel[16] = { + 0 << 12, 8 << 12, 2 << 12, 10 << 12, + 12 << 12, 4 << 12, 14 << 12, 6 << 12, + 3 << 12, 11 << 12, 1 << 12, 9 << 12, + 15 << 12, 7 << 12, 13 << 12, 5 << 12, + }; + + uint8_t * used = (uint8_t *) MSF_GIF_MALLOC(allocContext, msfUsedAllocSize); + if (!used) return blank; + uint32_t * cooked = (uint32_t *) MSF_GIF_MALLOC(allocContext, width * height * sizeof(uint32_t)); + if (!cooked) { MSF_GIF_FREE(allocContext, used, msfUsedAllocSize); return blank; } + + int count = 0; + MsfTimeLoop("do") do { + int rbits = rdepths[depth], gbits = gdepths[depth], bbits = bdepths[depth]; + int paletteSize = 1 << (rbits + gbits + bbits); + memset(used, 0, paletteSize * sizeof(uint8_t)); + + //TODO: document what this math does and why it's correct + int rdiff = (1 << (8 - rbits)) - 1; + int gdiff = (1 << (8 - gbits)) - 1; + int bdiff = (1 << (8 - bbits)) - 1; + short rmul = (short) ((255.0f - rdiff) / 255.0f * 257); + short gmul = (short) ((255.0f - gdiff) / 255.0f * 257); + short bmul = (short) ((255.0f - bdiff) / 255.0f * 257); + + int gmask = ((1 << gbits) - 1) << rbits; + int bmask = ((1 << bbits) - 1) << rbits << gbits; + + MsfTimeLoop("cook") for (int y = 0; y < height; ++y) { + int x = 0; + + #if (defined (__SSE2__) || defined (_M_X64) || _M_IX86_FP == 2) && !defined(MSF_GIF_NO_SSE2) + __m128i k = _mm_loadu_si128((__m128i *) &ditherKernel[(y & 3) * 4]); + __m128i k2 = _mm_or_si128(_mm_srli_epi32(k, rbits), _mm_slli_epi32(_mm_srli_epi32(k, bbits), 16)); + // MsfTimeLoop("SIMD") + for (; x < width - 3; x += 4) { + uint8_t * pixels = &raw[y * pitch + x * 4]; + __m128i p = _mm_loadu_si128((__m128i *) pixels); + + __m128i rb = _mm_and_si128(p, _mm_set1_epi32(0x00FF00FF)); + __m128i rb1 = _mm_mullo_epi16(rb, _mm_set_epi16(bmul, rmul, bmul, rmul, bmul, rmul, bmul, rmul)); + __m128i rb2 = _mm_adds_epu16(rb1, k2); + __m128i r3 = _mm_srli_epi32(_mm_and_si128(rb2, _mm_set1_epi32(0x0000FFFF)), 16 - rbits); + __m128i b3 = _mm_and_si128(_mm_srli_epi32(rb2, 32 - rbits - gbits - bbits), _mm_set1_epi32(bmask)); + + __m128i g = _mm_and_si128(_mm_srli_epi32(p, 8), _mm_set1_epi32(0x000000FF)); + __m128i g1 = _mm_mullo_epi16(g, _mm_set1_epi32(gmul)); + __m128i g2 = _mm_adds_epu16(g1, _mm_srli_epi32(k, gbits)); + __m128i g3 = _mm_and_si128(_mm_srli_epi32(g2, 16 - rbits - gbits), _mm_set1_epi32(gmask)); + + //TODO: does storing this as a __m128i then reading it back as a uint32_t violate strict aliasing? + uint32_t * c = &cooked[y * width + x]; + __m128i out = _mm_or_si128(_mm_or_si128(r3, g3), b3); + _mm_storeu_si128((__m128i *) c, out); + } + #endif + + //scalar cleanup loop + // MsfTimeLoop("scalar") + for (; x < width; ++x) { + uint8_t * p = &raw[y * pitch + x * 4]; + int dx = x & 3, dy = y & 3; + int k = ditherKernel[dy * 4 + dx]; + cooked[y * width + x] = + (msf_imin(65535, p[2] * bmul + (k >> bbits)) >> (16 - rbits - gbits - bbits) & bmask) | + (msf_imin(65535, p[1] * gmul + (k >> gbits)) >> (16 - rbits - gbits ) & gmask) | + msf_imin(65535, p[0] * rmul + (k >> rbits)) >> (16 - rbits ); + } + } + + count = 0; + MsfTimeLoop("mark and count") for (int i = 0; i < width * height; ++i) { + used[cooked[i]] = 1; + } + + //count used colors + MsfTimeLoop("count") for (int j = 0; j < paletteSize; ++j) { + count += used[j]; + } + } while (count >= 256 && --depth); + + MsfCookedFrame ret = { cooked, used, depth, count, rdepths[depth], gdepths[depth], bdepths[depth] }; + return ret; +} + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +/// MsfFileBuffer /// +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// + +typedef struct { + uint8_t * block; + uint8_t * head; + uint8_t * end; +} MsfFileBuffer; + +static inline void msf_fb_write_data(MsfFileBuffer * buf, void * data, size_t bytes) { + memcpy(buf->head, data, bytes); + buf->head += bytes; +} + +static MsfFileBuffer msf_create_file_buffer(void * allocContext, size_t bytes) { + uint8_t * block = (uint8_t *) MSF_GIF_MALLOC(allocContext, bytes); + MsfFileBuffer ret = { block, block, block + bytes }; + return ret; +} + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +/// Frame Compression /// +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// + +static inline int msf_put_code(MsfFileBuffer * buf, uint32_t * blockBits, int len, uint32_t code) { + //insert new code into block buffer + int idx = *blockBits / 8; + int bit = *blockBits % 8; + buf->head[idx + 0] |= code << bit ; + buf->head[idx + 1] |= code >> ( 8 - bit); + buf->head[idx + 2] |= code >> (16 - bit); + *blockBits += len; + + //prep the next block buffer if the current one is full + if (*blockBits >= 256 * 8) { + *blockBits -= 255 * 8; + buf->head += 256; + buf->head[2] = buf->head[1]; + buf->head[1] = buf->head[0]; + buf->head[0] = 255; + memset(buf->head + 4, 0, 256); + } + + return 1; +} + +typedef struct { + int16_t * data; + int len; + int stride; +} MsfStridedList; + +static inline void msf_lzw_reset(MsfStridedList * lzw, int tableSize, int stride) { MsfTimeFunc + memset(lzw->data, 0xFF, 4096 * stride * sizeof(int16_t)); + lzw->len = tableSize + 2; + lzw->stride = stride; +} + +static MsfFileBuffer msf_compress_frame(void * allocContext, int width, int height, int centiSeconds, + MsfCookedFrame frame, MsfCookedFrame previous) +{ MsfTimeFunc + MsfFileBuffer blank = {0}; + + //NOTE: we allocate enough memory for the worst case upfront because it's a reasonable amount + // (about half the size of a CookedFrame), and prevents us from ever having to check size or realloc + MsfFileBuffer buf = msf_create_file_buffer(allocContext, 1024 + width * height * 2); + if (!buf.block) return blank; + int lzwAllocSize = 4096 * 256 * sizeof(int16_t); + MsfStridedList lzw = { (int16_t *) MSF_GIF_MALLOC(allocContext, lzwAllocSize) }; + if (!lzw.data) { MSF_GIF_FREE(allocContext, buf.block, buf.end - buf.block); return blank; } + + //allocate tlb + int totalBits = frame.rbits + frame.gbits + frame.bbits; + int tlbSize = 1 << totalBits; + uint8_t tlb[1 << 16]; //only 64k, so stack allocating is fine + + //generate palette + typedef struct { uint8_t r, g, b; } Color3; + Color3 table[256] = { {0} }; + int tableIdx = 1; //we start counting at 1 because 0 is the transparent color + MsfTimeLoop("table") for (int i = 0; i < tlbSize; ++i) { + if (frame.used[i]) { + tlb[i] = tableIdx; + int rmask = (1 << frame.rbits) - 1; + int gmask = (1 << frame.gbits) - 1; + //isolate components + int r = i & rmask; + int g = i >> frame.rbits & gmask; + int b = i >> (frame.rbits + frame.gbits); + //shift into highest bits + r <<= 8 - frame.rbits; + g <<= 8 - frame.gbits; + b <<= 8 - frame.bbits; + table[tableIdx].r = r | r >> frame.rbits | r >> (frame.rbits * 2) | r >> (frame.rbits * 3); + table[tableIdx].g = g | g >> frame.gbits | g >> (frame.gbits * 2) | g >> (frame.gbits * 3); + table[tableIdx].b = b | b >> frame.bbits | b >> (frame.bbits * 2) | b >> (frame.bbits * 3); + ++tableIdx; + } + } + + int tableBits = msf_bit_log(tableIdx - 1); + int tableSize = 1 << tableBits; + //NOTE: we don't just compare `depth` field here because it will be wrong for the first frame and we will segfault + int hasSamePal = frame.rbits == previous.rbits && frame.gbits == previous.gbits && frame.bbits == previous.bbits; + + //NOTE: because __attribute__((__packed__)) is annoyingly compiler-specific, we do this unreadable weirdness + char headerBytes[19] = "\x21\xF9\x04\x05\0\0\0\0" "\x2C\0\0\0\0\0\0\0\0\x80"; + memcpy(&headerBytes[4], ¢iSeconds, 2); + memcpy(&headerBytes[13], &width, 2); + memcpy(&headerBytes[15], &height, 2); + headerBytes[17] |= tableBits - 1; + msf_fb_write_data(&buf, headerBytes, 18); + + //local color table + msf_fb_write_data(&buf, table, tableSize * sizeof(Color3)); + *buf.head++ = tableBits; + + msf_lzw_reset(&lzw, tableSize, tableIdx); + + //prep block + memset(buf.head, 0, 260); + buf.head[0] = 255; + uint32_t blockBits = 8; //relative to block.head + + int lastCode = hasSamePal && frame.pixels[0] == previous.pixels[0]? 0 : tlb[frame.pixels[0]]; + MsfTimeLoop("compress") for (int i = 1; i < width * height; ++i) { + //PERF: branching vs. branchless version of this line is observed to have no discernable impact on speed + int color = hasSamePal && frame.pixels[i] == previous.pixels[i]? 0 : tlb[frame.pixels[i]]; + //PERF: branchless version must use && otherwise it will segfault on frame 1, but it's well-predicted so OK + // int color = (!(hasSamePal && frame.pixels[i] == previous.pixels[i])) * tlb[frame.pixels[i]]; + int code = (&lzw.data[lastCode * lzw.stride])[color]; + if (code < 0) { + //write to code stream + int codeBits = msf_bit_log(lzw.len - 1); + msf_put_code(&buf, &blockBits, codeBits, lastCode); + + //NOTE: [I THINK] we need to leave room for 2 more codes (leftover and end code) + // because we don't ever reset the table after writing the leftover bits + //Q: is my thinking correct on this one? + //Q: why can't we just check when writing out those codes? too verbose? can't we factor to a funtion? + if (lzw.len > 4094) { + //reset buffer code table + msf_put_code(&buf, &blockBits, codeBits, tableSize); + msf_lzw_reset(&lzw, tableSize, tableIdx); + } else { + (&lzw.data[lastCode * lzw.stride])[color] = lzw.len; + ++lzw.len; + } + + lastCode = color; + } else { + lastCode = code; + } + } + + //write code for leftover index buffer contents, then the end code + MSF_GIF_FREE(allocContext, lzw.data, lzwAllocSize); + msf_put_code(&buf, &blockBits, msf_bit_log(lzw.len - 1), lastCode); + msf_put_code(&buf, &blockBits, msf_bit_log(lzw.len), tableSize + 1); + + //flush remaining data + if (blockBits > 8) { + int bytes = (blockBits + 7) / 8; //round up + buf.head[0] = bytes - 1; + buf.head += bytes; + } + + *buf.head++ = 0; //terminating block + + return buf; +} + +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +/// Incremental API /// +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// + +size_t msf_gif_begin(MsfGifState * handle, const char * outputFilePath, int width, int height) { MsfTimeFunc + //TODO: convert this to UTF-16 to correctly handle unicode on windows!?!? + // (or just say "do it yourself" now that replacing fopen is a thing?) + if (!(handle->fp = MSF_GIF_FOPEN(handle->customOutputContext, outputFilePath))) return 0; + MsfCookedFrame empty = {0}; //god I hate MSVC... + handle->previousFrame = empty; + handle->previousFrame.depth = 15; + handle->width = width; + handle->height = height; + handle->totalBytesWritten = 0; + + //NOTE: because __attribute__((__packed__)) is annoyingly compiler-specific, we do this unreadable weirdness + char headerBytes[33] = "GIF89a\0\0\0\0\x10\0\0" "\x21\xFF\x0BNETSCAPE2.0\x03\x01\0\0\0"; + memcpy(&headerBytes[6], &width, 2); + memcpy(&headerBytes[8], &height, 2); + if (!MSF_GIF_FWRITE(handle->customOutputContext, handle->fp, headerBytes, 32)) { + MSF_GIF_FCLOSE(handle->customOutputContext, handle->fp); + return 0; + } + handle->totalBytesWritten += 32; + return handle->totalBytesWritten; +} + +size_t msf_gif_frame(MsfGifState * handle, + uint8_t * pixelData, int centiSecondsPerFame, int maxBitDepth, int pitchInBytes) +{ MsfTimeFunc + maxBitDepth = msf_imax(1, msf_imin(16, maxBitDepth)); + if (pitchInBytes == 0) pitchInBytes = handle->width * 4; + if (pitchInBytes < 0) pixelData -= pitchInBytes * (handle->height - 1); + MsfCookedFrame frame = msf_cook_frame(handle->customAllocatorContext, handle->width, handle->height, pitchInBytes, + // msf_imin(maxBitDepth, handle->previousFrame.depth + 1), pixelData); + msf_imin(maxBitDepth, handle->previousFrame.depth + 160 / msf_imax(1, handle->previousFrame.count)), pixelData); + if (!frame.pixels) { MSF_GIF_FCLOSE(handle->customOutputContext, handle->fp); return 0; } + MsfFileBuffer buf = msf_compress_frame(handle->customAllocatorContext, + handle->width, handle->height, centiSecondsPerFame, frame, handle->previousFrame); + if (!buf.block) { MSF_GIF_FCLOSE(handle->customOutputContext, handle->fp); return 0; } + if (!MSF_GIF_FWRITE(handle->customOutputContext, handle->fp, buf.block, buf.head - buf.block)) { + MSF_GIF_FCLOSE(handle->customOutputContext, handle->fp); + return 0; + } + handle->totalBytesWritten += buf.head - buf.block; + MSF_GIF_FREE(handle->customAllocatorContext, buf.block, buf.end - buf.block); + MSF_GIF_FREE(handle->customAllocatorContext, frame.used, msfUsedAllocSize); + MSF_GIF_FREE(handle->customAllocatorContext, + handle->previousFrame.pixels, handle->width * handle->height * sizeof(uint32_t)); + handle->previousFrame = frame; + return handle->totalBytesWritten; +} + +size_t msf_gif_end(MsfGifState * handle) { MsfTimeFunc + int allocSize = handle->width * handle->height * sizeof(uint32_t); + uint8_t trailingMarker = 0x3B; + if (!MSF_GIF_FWRITE(handle->customOutputContext, handle->fp, &trailingMarker, 1)) { + MSF_GIF_FCLOSE(handle->customOutputContext, handle->fp); + MSF_GIF_FREE(handle->customAllocatorContext, handle->previousFrame.pixels, allocSize); + return 0; + } + handle->totalBytesWritten += 1; + if (MSF_GIF_FCLOSE(handle->customOutputContext, handle->fp)) return 0; + MSF_GIF_FREE(handle->customAllocatorContext, handle->previousFrame.pixels, allocSize); + return handle->totalBytesWritten; +} + +#endif //MSF_GIF_ALREADY_IMPLEMENTED_IN_THIS_TRANSLATION_UNIT +#endif //MSF_GIF_IMPL + +/* +------------------------------------------------------------------------------ +This software is available under 2 licenses -- choose whichever you prefer. +------------------------------------------------------------------------------ +ALTERNATIVE A - MIT License +Copyright (c) 2020 Miles Fogle +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies +of the Software, and to permit persons to whom the Software is furnished to do +so, subject to the following conditions: +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. +------------------------------------------------------------------------------ +ALTERNATIVE B - Public Domain (www.unlicense.org) +This is free and unencumbered software released into the public domain. +Anyone is free to copy, modify, publish, use, compile, sell, or distribute this +software, either in source code form or as a compiled binary, for any purpose, +commercial or non-commercial, and by any means. +In jurisdictions that recognize copyright laws, the author or authors of this +software dedicate any and all copyright interest in the software to the public +domain. We make this dedication for the benefit of the public at large and to +the detriment of our heirs and successors. We intend this dedication to be an +overt act of relinquishment in perpetuity of all present and future rights to +this software under copyright law. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN +ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +------------------------------------------------------------------------------ +*/