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#21 conditionally use QuantizeBuffer, not available in giflib 4.2 #22

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#21 conditionally use QuantizeBuffer, not available in giflib 4.2 #22

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12 changes: 10 additions & 2 deletions gif.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,12 +17,18 @@

#define INLINE static inline


// QuantizeBuffer has been removed from giflib 4.2
// in http://sourceforge.net/p/giflib/code/ci/ce02f85e6ed1e1455a4aea9ffa68a3e2b8f8a4b1/
#if !defined(GIFLIB_MAJOR) || (GIFLIB_MAJOR == 4 && GIFLIB_MINOR < 2)
#define GifQuantizeBuffer QuantizeBuffer
#endif

#if !defined(GIFLIB_MAJOR) || GIFLIB_MAJOR < 5
#define EGifOpen(x, y, z) EGifOpen(x, y)
#define EGifCloseFile(x, y) EGifCloseFile(x)
#define GifMakeMapObject MakeMapObject
#define GifFreeMapObject FreeMapObject
#define GifQuantizeBuffer QuantizeBuffer
#define GIF_BEGIN_APP_EXTENSION(f) EGifPutExtensionFirst(f, APPLICATION_EXT_FUNC_CODE, strlen(GIF_APP), GIF_APP)
#define GIF_END_APP_EXTENSION(f, m) EGifPutExtensionLast(f, APPLICATION_EXT_FUNC_CODE, sizeof(m), m)
#else
Expand Down Expand Up @@ -318,6 +324,8 @@ gif_encode(Image *image, int single, int *size)
ColorMapObject *palette = GifMakeMapObject(NCOLORS, NULL);
int palette_size = NCOLORS;


#if !defined(GIFLIB_MAJOR) || (GIFLIB_MAJOR == 4 && GIFLIB_MINOR < 2)
// Quantize again using giflib, since it yields a palette which produces
// better compression, reducing the file size by 20%. Note that this second
// quantization is very fast, because the image already has 256 colors, so
Expand All @@ -327,7 +335,7 @@ gif_encode(Image *image, int single, int *size)
gif_frames_free(frames, count);
return NULL;
}

# endif
frames[0].data = malloc(total);
memcpy(frames[0].data, output, total);
frames[0].width = width;
Expand Down