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Evaluate output cluster's bit_costs once in HistogramRefine.

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Avoid bit_costs evaluated every time in function HistogramDistance. Also moved
VP8LInitBackwardRefs and VP8LClearBackwardRefs to backward_references.h

Change-Id: Id507f164d0fc64480aebc4a3ea3e6950ed377a60
This commit is contained in:
Vikas Arora
2012-04-27 08:04:57 +00:00
committed by James Zern
parent 781c01f421
commit cf33ccd160
3 changed files with 52 additions and 40 deletions
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15
src/enc/backward_references.h
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@@ -15,6 +15,7 @@
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include "../webp/types.h"
#if defined(__cplusplus) || defined(c_plusplus)
@@ -172,6 +173,20 @@ static WEBP_INLINE uint32_t PixOrCopyDistance(const PixOrCopy* const p) {
return p->argb_or_distance;
}
static WEBP_INLINE void VP8LInitBackwardRefs(VP8LBackwardRefs* const refs) {
if (refs != NULL) {
refs->refs = NULL;
refs->size = 0;
}
}
static WEBP_INLINE void VP8LClearBackwardRefs(VP8LBackwardRefs* const refs) {
if (refs != NULL) {
free(refs->refs);
VP8LInitBackwardRefs(refs);
}
}
// Ridiculously simple backward references for images where it is unlikely
// that there are large backward references (photos).
void VP8LBackwardReferencesRle(