dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-17 06:19:54 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

Run TraceBackwards for higher qualities.

Browse Source 
Also reduce the iteration count in function VP8LHashChain_FindCopy.

Change-Id: I73e3811e142e81314515587fd655ab3bfa74d099
This commit is contained in:
Vikas Arora
2012-04-24 09:55:19 +00:00
committed by James Zern
parent 412222c88c
commit c6ac4dfbb4
2 changed files with 33 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
src/enc/backward_references.c
View File

@ -121,7 +121,7 @@ static int VP8LHashChain_FindCopy(VP8LHashChain* p,
const uint64_t hash_code = GetHash64(next_two_pixels);
int prev_length = 0;
int64_t best_val = 0;
int give_up = quality * 3 / 4 + 25;
int give_up = 10 + (quality >> 1);
const int min_pos = (index > kWindowSize) ? index - kWindowSize : 0;
int32_t pos;
int64_t length;
@ -134,8 +134,7 @@ static int VP8LHashChain_FindCopy(VP8LHashChain* p,
pos >= min_pos;
pos = p->chain_[pos]) {
if (give_up < 0) {
if (give_up < -quality * 8 ||
best_val >= 0xff0000) {
if (give_up < -quality * 2 || best_val >= 0xff0000) {
break;
}
}
@ -219,9 +218,9 @@ int VP8LBackwardReferencesHashChain(int xsize, int ysize, int use_palette,
const uint32_t* argb, int palette_bits,
int quality, PixOrCopy* stream,
int* stream_size) {
const int pix_count = xsize * ysize;
int i;
int ok = 0;
const int pix_count = xsize * ysize;
VP8LHashChain* hash_chain = (VP8LHashChain*)malloc(sizeof(*hash_chain));
VP8LColorCache hashers;
if (!hash_chain ||