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lossless: simpler alpha cleanup preprocessing

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setting all transparent pixels to black rather than the "flatten" method.

0.3% smaller filesize on the 1000 PNGs if alpha cleanup is used (before: 18685774, after: 18622472)

Change-Id: Ib0db9e7ccde55b36e82de07855f2dbb630fe62b1
This commit is contained in:
Lode Vandevenne
2015-12-17 15:03:26 +01:00
committed by Pascal Massimino
parent ba7f4b68c9
commit fb4c7832f1
3 changed files with 33 additions and 4 deletions
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13
src/enc/webpenc.c
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@ -324,14 +324,15 @@ int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
if (pic->width > WEBP_MAX_DIMENSION || pic->height > WEBP_MAX_DIMENSION)
return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
if (!config->exact) {
WebPCleanupTransparentArea(pic);
}
if (pic->stats != NULL) memset(pic->stats, 0, sizeof(*pic->stats));
if (!config->lossless) {
VP8Encoder* enc = NULL;
if (!config->exact) {
WebPCleanupTransparentArea(pic);
}
if (pic->use_argb || pic->y == NULL || pic->u == NULL || pic->v == NULL) {
// Make sure we have YUVA samples.
if (config->preprocessing & 4) {
@ -379,6 +380,10 @@ int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
return 0;
}
if (!config->exact) {
WebPCleanupTransparentAreaLossless(pic);
}
ok = VP8LEncodeImage(config, pic); // Sets pic->error in case of problem.
}