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demux: add {Next,Prev}Frame
Replaces WebPDemuxSetFrame(). Change-Id: I38cef0ebeabb5c2f164322502abe1780f7a65e06
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@ -546,9 +546,11 @@ typedef struct {
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WEBP_EXTERN(int) WebPDemuxGetFrame(
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const WebPDemuxer* const dmux, int frame_number, WebPIterator* const iter);
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// Sets 'iter->tile_' to point to frame number 'frame_number'.
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// Sets 'iter->tile_' to point to the next ('iter->frame_num_' + 1) or previous
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// ('iter->frame_num_' - 1) frame. These functions do not loop.
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// Returns true on success, false otherwise.
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WEBP_EXTERN(int) WebPDemuxSetFrame(WebPIterator* const iter, int frame_number);
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WEBP_EXTERN(int) WebPDemuxNextFrame(WebPIterator* const iter);
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WEBP_EXTERN(int) WebPDemuxPrevFrame(WebPIterator* const iter);
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// Sets 'iter->tile_' to reflect tile number 'tile_number'.
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// Returns true if tile 'tile_number' is present, false otherwise.
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