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Make discarding invisible RGB values (cleanup alpha) the default.

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Rename the flag to exact instead of the opposite cleanup_alpha. Add the flag to
WebPConfig. Do the cleanup in the webp encoder library rather than the cwebp
binary, this will be needed for the next stage: smarter alpha cleanup for
better compression which cannot be done as a preprocessing due to depending on
predictor choices in the encoder.

Change-Id: I2fbf57f918a35f2da6186ef0b5d85e5fd0020eef
This commit is contained in:
Lode Vandevenne
2015-11-16 13:14:57 +00:00
committed by James Zern
parent b37b0179c5
commit 1f9be97c22
6 changed files with 24 additions and 13 deletions
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4
src/enc/webpenc.c
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@ -321,6 +321,10 @@ 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) {