dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2024-12-27 06:08:21 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

Move static method definition before its usage.

Browse Source 
Change-Id: Id766c2bea92e7ebf0de65046f73429b74b4fdda4
This commit is contained in:
Vikas Arora 2014-11-13 13:17:24 -08:00
parent 0f23566558
commit 413dfc0c4b
1 changed files with 109 additions and 116 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

225
src/enc/backward_references.c
View File

@ -810,12 +810,120 @@ static void BackwardReferences2DLocality(int xsize,
}
}
// Returns entropy for the given cache bits.
static double ComputeCacheEntropy(const uint32_t* const argb,
int xsize, int ysize,
const VP8LBackwardRefs* const refs,
int cache_bits) {
int pixel_index = 0;
uint32_t k;
const int use_color_cache = (cache_bits > 0);
int cc_init = 0;
double entropy = MAX_ENTROPY;
const double kSmallPenaltyForLargeCache = 4.0;
VP8LColorCache hashers;
VP8LRefsCursor c = VP8LRefsCursorInit(refs);
VP8LHistogram* histo = VP8LAllocateHistogram(cache_bits);
if (histo == NULL) goto Error;
if (use_color_cache) {
cc_init = VP8LColorCacheInit(&hashers, cache_bits);
if (!cc_init) goto Error;
}
while (VP8LRefsCursorOk(&c)) {
const PixOrCopy* const v = c.cur_pos;
if (PixOrCopyIsLiteral(v)) {
if (use_color_cache &&
VP8LColorCacheContains(&hashers, argb[pixel_index])) {
// push pixel as a cache index
const int ix = VP8LColorCacheGetIndex(&hashers, argb[pixel_index]);
const PixOrCopy token = PixOrCopyCreateCacheIdx(ix);
VP8LHistogramAddSinglePixOrCopy(histo, &token);
} else {
VP8LHistogramAddSinglePixOrCopy(histo, v);
}
} else {
VP8LHistogramAddSinglePixOrCopy(histo, v);
}
if (use_color_cache) {
for (k = 0; k < PixOrCopyLength(v); ++k) {
VP8LColorCacheInsert(&hashers, argb[pixel_index + k]);
}
}
pixel_index += PixOrCopyLength(v);
VP8LRefsCursorNext(&c);
}
assert(pixel_index == xsize * ysize);
(void)xsize; // xsize is not used in non-debug compilations otherwise.
(void)ysize; // ysize is not used in non-debug compilations otherwise.
entropy = VP8LHistogramEstimateBits(histo) +
kSmallPenaltyForLargeCache * cache_bits;
Error:
if (cc_init) VP8LColorCacheClear(&hashers);
VP8LFreeHistogram(histo);
return entropy;
}
// Evaluate optimal cache bits for the local color cache.
// The input *best_cache_bits sets the maximum cache bits to use (passing 0
// implies disabling the local color cache). The local color cache is also
// disabled for the lower (<= 25) quality.
// Returns 0 in case of memory error.
static int CalculateBestCacheSize(const uint32_t* const argb,
int xsize, int ysize, int quality,
VP8LHashChain* const hash_chain,
VP8LBackwardRefs* const refs,
int* const lz77_computed,
int* const best_cache_bits);
int* const best_cache_bits) {
int eval_low = 1;
int eval_high = 1;
double entropy_low = MAX_ENTROPY;
double entropy_high = MAX_ENTROPY;
const double cost_mul = 5e-4;
int cache_bits_low = 0;
int cache_bits_high = (quality <= 25) ? 0 : *best_cache_bits;
assert(cache_bits_high <= MAX_COLOR_CACHE_BITS);
*lz77_computed = 0;
if (cache_bits_high == 0) {
*best_cache_bits = 0;
// Local color cache is disabled.
return 1;
}
if (!BackwardReferencesLz77(xsize, ysize, argb, cache_bits_low, quality,
hash_chain, refs)) {
return 0;
}
// Do a binary search to find the optimal entropy for cache_bits.
while (eval_low || eval_high) {
if (eval_low) {
entropy_low =
ComputeCacheEntropy(argb, xsize, ysize, refs, cache_bits_low);
entropy_low += entropy_low * cache_bits_low * cost_mul;
eval_low = 0;
}
if (eval_high) {
entropy_high =
ComputeCacheEntropy(argb, xsize, ysize, refs, cache_bits_high);
entropy_high += entropy_high * cache_bits_high * cost_mul;
eval_high = 0;
}
if (entropy_high < entropy_low) {
const int prev_cache_bits_low = cache_bits_low;
*best_cache_bits = cache_bits_high;
cache_bits_low = (cache_bits_low + cache_bits_high) / 2;
if (cache_bits_low != prev_cache_bits_low) eval_low = 1;
} else {
*best_cache_bits = cache_bits_low;
cache_bits_high = (cache_bits_low + cache_bits_high) / 2;
if (cache_bits_high != cache_bits_low) eval_high = 1;
}
}
*lz77_computed = 1;
return 1;
}
// Update (in-place) backward references for specified cache_bits.
static int BackwardRefsWithLocalCache(const uint32_t* const argb,
@ -933,118 +1041,3 @@ VP8LBackwardRefs* VP8LGetBackwardReferences(
VP8LFreeHistogram(histo);
return best;
}
// Returns entropy for the given cache bits.
static double ComputeCacheEntropy(const uint32_t* const argb,
int xsize, int ysize,
const VP8LBackwardRefs* const refs,
int cache_bits) {
int pixel_index = 0;
uint32_t k;
const int use_color_cache = (cache_bits > 0);
int cc_init = 0;
double entropy = MAX_ENTROPY;
const double kSmallPenaltyForLargeCache = 4.0;
VP8LColorCache hashers;
VP8LRefsCursor c = VP8LRefsCursorInit(refs);
VP8LHistogram* histo = VP8LAllocateHistogram(cache_bits);
if (histo == NULL) goto Error;
if (use_color_cache) {
cc_init = VP8LColorCacheInit(&hashers, cache_bits);
if (!cc_init) goto Error;
}
while (VP8LRefsCursorOk(&c)) {
const PixOrCopy* const v = c.cur_pos;
if (PixOrCopyIsLiteral(v)) {
if (use_color_cache &&
VP8LColorCacheContains(&hashers, argb[pixel_index])) {
// push pixel as a cache index
const int ix = VP8LColorCacheGetIndex(&hashers, argb[pixel_index]);
const PixOrCopy token = PixOrCopyCreateCacheIdx(ix);
VP8LHistogramAddSinglePixOrCopy(histo, &token);
} else {
VP8LHistogramAddSinglePixOrCopy(histo, v);
}
} else {
VP8LHistogramAddSinglePixOrCopy(histo, v);
}
if (use_color_cache) {
for (k = 0; k < PixOrCopyLength(v); ++k) {
VP8LColorCacheInsert(&hashers, argb[pixel_index + k]);
}
}
pixel_index += PixOrCopyLength(v);
VP8LRefsCursorNext(&c);
}
assert(pixel_index == xsize * ysize);
(void)xsize; // xsize is not used in non-debug compilations otherwise.
(void)ysize; // ysize is not used in non-debug compilations otherwise.
entropy = VP8LHistogramEstimateBits(histo) +
kSmallPenaltyForLargeCache * cache_bits;
Error:
if (cc_init) VP8LColorCacheClear(&hashers);
VP8LFreeHistogram(histo);
return entropy;
}
// Evaluate optimal cache bits for the local color cache.
// The input *best_cache_bits sets the maximum cache bits to use (passing 0
// implies disabling the local color cache). The local color cache is also
// disabled for the lower (<= 25) quality.
// Returns 0 in case of memory error.
static int CalculateBestCacheSize(const uint32_t* const argb,
int xsize, int ysize, int quality,
VP8LHashChain* const hash_chain,
VP8LBackwardRefs* const refs,
int* const lz77_computed,
int* const best_cache_bits) {
int eval_low = 1;
int eval_high = 1;
double entropy_low = MAX_ENTROPY;
double entropy_high = MAX_ENTROPY;
const double cost_mul = 5e-4;
int cache_bits_low = 0;
int cache_bits_high = (quality <= 25) ? 0 : *best_cache_bits;
assert(cache_bits_high <= MAX_COLOR_CACHE_BITS);
*lz77_computed = 0;
if (cache_bits_high == 0) {
*best_cache_bits = 0;
// Local color cache is disabled.
return 1;
}
if (!BackwardReferencesLz77(xsize, ysize, argb, cache_bits_low, quality,
hash_chain, refs)) {
return 0;
}
// Do a binary search to find the optimal entropy for cache_bits.
while (eval_low || eval_high) {
if (eval_low) {
entropy_low =
ComputeCacheEntropy(argb, xsize, ysize, refs, cache_bits_low);
entropy_low += entropy_low * cache_bits_low * cost_mul;
eval_low = 0;
}
if (eval_high) {
entropy_high =
ComputeCacheEntropy(argb, xsize, ysize, refs, cache_bits_high);
entropy_high += entropy_high * cache_bits_high * cost_mul;
eval_high = 0;
}
if (entropy_high < entropy_low) {
const int prev_cache_bits_low = cache_bits_low;
*best_cache_bits = cache_bits_high;
cache_bits_low = (cache_bits_low + cache_bits_high) / 2;
if (cache_bits_low != prev_cache_bits_low) eval_low = 1;
} else {
*best_cache_bits = cache_bits_low;
cache_bits_high = (cache_bits_low + cache_bits_high) / 2;
if (cache_bits_high != cache_bits_low) eval_high = 1;
}
}
*lz77_computed = 1;
return 1;
}