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libwebp/demux: add WebPDemuxGetI

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Enables queries for format flag, canvas width/height.

Change-Id: I1d97a633712141e42dfc86c95492eb6da5cefa01
This commit is contained in:
James Zern 2012-06-07 06:56:08 +00:00
parent 2f2d4d5889
commit ad9ada3b9f
2 changed files with 31 additions and 0 deletions
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15
src/mux/demux.c
View File

@ -650,6 +650,21 @@ void WebPDemuxDelete(WebPDemuxer* const dmux) {
free(dmux);
}
// -----------------------------------------------------------------------------
uint32_t WebPDemuxGetI(const WebPDemuxer* const dmux,
WebPFormatFeature feature) {
if (dmux == NULL) return 0;
switch (feature) {
case WEBP_FF_FORMAT_FLAGS: return dmux->feature_flags_;
case WEBP_FF_CANVAS_WIDTH: return (uint32_t)dmux->canvas_width_;
case WEBP_FF_CANVAS_HEIGHT: return (uint32_t)dmux->canvas_height_;
case WEBP_FF_LOOP_COUNT: return (uint32_t)dmux->loop_count_;
}
return 0;
}
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif

16
src/webp/mux.h
View File

@ -502,6 +502,22 @@ static WEBP_INLINE WebPDemuxer* WebPDemuxPartial(
// Frees memory associated with 'dmux'.
WEBP_EXTERN(void) WebPDemuxDelete(WebPDemuxer* const dmux);
//------------------------------------------------------------------------------
// Data/information extraction.
typedef enum {
WEBP_FF_FORMAT_FLAGS, // Extended format flags present in the 'VP8X' chunk.
WEBP_FF_CANVAS_WIDTH,
WEBP_FF_CANVAS_HEIGHT,
WEBP_FF_LOOP_COUNT
} WebPFormatFeature;
// Get the 'feature' value from the 'dmux'.
// NOTE: values are only valid if WebPDemux() was used or WebPDemuxPartial()
// returned a state > WEBP_DEMUX_PARSING_HEADER.
WEBP_EXTERN(uint32_t) WebPDemuxGetI(
const WebPDemuxer* const dmux, WebPFormatFeature feature);
//------------------------------------------------------------------------------
#if defined(__cplusplus) || defined(c_plusplus)