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gif2webp: simplify giflib version checking

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introduce LOCAL_GIF_PREREQ/VERSION similar to the GCC variants in dsp.

Change-Id: I00ba5d523047b3b1c14ade992172e75e69043eb3
This commit is contained in:
James Zern 2014-07-22 17:41:55 -07:00
parent d2cc61b7dd
commit 222f9b1a9d
1 changed files with 13 additions and 6 deletions
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19
examples/gif2webp.c
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@ -28,6 +28,16 @@
#include "./example_util.h"
#include "./gif2webp_util.h"
// GIFLIB_MAJOR is only defined in libgif >= 4.2.0.
#if defined(GIFLIB_MAJOR) && defined(GIFLIB_MINOR)
# define LOCAL_GIF_VERSION ((GIFLIB_MAJOR << 8) | GIFLIB_MINOR)
# define LOCAL_GIF_PREREQ(maj, min) \
(LOCAL_GIF_VERSION >= (((maj) << 8) | (min)))
#else
# define LOCAL_GIF_VERSION 0
# define LOCAL_GIF_PREREQ(maj, min) 0
#endif
#define GIF_TRANSPARENT_MASK 0x01
#define GIF_DISPOSE_MASK 0x07
#define GIF_DISPOSE_SHIFT 2
@ -172,11 +182,9 @@ static int GetBackgroundColor(const ColorMapObject* const color_map,
}
static void DisplayGifError(const GifFileType* const gif, int gif_error) {
// GIFLIB_MAJOR is only defined in libgif >= 4.2.0.
// libgif 4.2.0 has retired PrintGifError() and added GifErrorString().
#if defined(GIFLIB_MAJOR) && defined(GIFLIB_MINOR) && \
((GIFLIB_MAJOR == 4 && GIFLIB_MINOR >= 2) || GIFLIB_MAJOR > 4)
#if GIFLIB_MAJOR >= 5
#if LOCAL_GIF_PREREQ(4,2)
#if LOCAL_GIF_PREREQ(5,0)
// Static string actually, hence the const char* cast.
const char* error_str = (const char*)GifErrorString(
(gif == NULL) ? gif_error : gif->Error);
@ -396,8 +404,7 @@ int main(int argc, const char *argv[]) {
}
// Start the decoder object
#if defined(GIFLIB_MAJOR) && (GIFLIB_MAJOR >= 5)
// There was an API change in version 5.0.0.
#if LOCAL_GIF_PREREQ(5,0)
gif = DGifOpenFileName(in_file, &gif_error);
#else
gif = DGifOpenFileName(in_file);