dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-02-13 15:32:53 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

Tune alpha quality mapping to more reasonable values.

Browse Source 
This results in a significant speedup  with minimal increase in file sizes.

Change-Id: I6ecefe33eee219fba4099810d04a916f7efbd292
This commit is contained in:
Urvang Joshi 2013-02-05 19:48:30 +01:00 committed by skal
parent 7c732e59f4
commit 1267d498dc
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
src/enc/alpha.c
View File

@ -79,10 +79,9 @@ static int EncodeLossless(const uint8_t* const data, int width, int height,
WebPConfigInit(&config); WebPConfigInit(&config);
config.lossless = 1; config.lossless = 1;
config.method = effort_level; // impact is very small config.method = effort_level; // impact is very small
// Set moderate default quality setting for alpha. Higher qualities (80 and // Set a moderate default quality setting for alpha.
// above) could be very slow. config.quality = 6.f * effort_level;
config.quality = 10.f + 15.f * effort_level; assert(config.quality >= 0 && config.quality <= 100.f);
if (config.quality > 100.f) config.quality = 100.f;
ok = VP8LBitWriterInit(&tmp_bw, (width * height) >> 3); ok = VP8LBitWriterInit(&tmp_bw, (width * height) >> 3);
ok = ok && (VP8LEncodeStream(&config, &picture, &tmp_bw) == VP8_ENC_OK); ok = ok && (VP8LEncodeStream(&config, &picture, &tmp_bw) == VP8_ENC_OK);