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Merge "Tune alpha quality mapping to more reasonable values."

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pascal massimino 2013-02-05 10:50:28 -08:00 committed by Gerrit Code Review
commit 1f803f645d
1 changed files with 3 additions and 4 deletions
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src/enc/alpha.c
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@ -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);