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Check more backward matches with higher quality.

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Change-Id: I3f0887b0b9b7f0e69758f51783807e1583b74be2
This commit is contained in:
Vincent Rabaud 2016-06-14 21:50:03 +02:00
parent 8190374c2b
commit b0c7e49e58
1 changed files with 6 additions and 1 deletions
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7
src/enc/backward_references.c
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@ -245,6 +245,7 @@ int VP8LHashChainFill(VP8LHashChain* const p, int quality,
const uint32_t* const argb, int xsize, int ysize) { const uint32_t* const argb, int xsize, int ysize) {
const int size = xsize * ysize; const int size = xsize * ysize;
const int iter_max = GetMaxItersForQuality(quality); const int iter_max = GetMaxItersForQuality(quality);
const int iter_min = iter_max - quality / 10;
const uint32_t window_size = GetWindowSizeForHashChain(quality, xsize); const uint32_t window_size = GetWindowSizeForHashChain(quality, xsize);
int pos; int pos;
uint32_t base_position; uint32_t base_position;
@ -296,7 +297,11 @@ int VP8LHashChainFill(VP8LHashChain* const p, int quality,
if (best_length < curr_length) { if (best_length < curr_length) {
best_length = curr_length; best_length = curr_length;
best_distance = base_position - pos; best_distance = base_position - pos;
if (curr_length >= length_max) { // Stop if we have reached the maximum length. Otherwise, make sure
// we have executed a minimum number of iterations depending on the
// quality.
if ((best_length == MAX_LENGTH) ||
(curr_length >= length_max && iter < iter_min)) {
break; break;
} }
} }