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add automatic YUVA/ARGB conversion during WebPEncode()

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Adds new methods WebPPictureARGBToYUVA() and WebPPictureYUVAToARGB()
Depending on the value of picture->use_argb_input,
the main call WebPEncode() will convert appropriately.
Note that both conversions are lossy, so it's recommended to:
* use YUVA input for lossy compression (picture->use_argb_input=0)
* use ARGB input for lossless compression (picture->use_argb_input=1)

Change-Id: I8269d607723ee8a1136b9f4999f7ff4e657bbb04
This commit is contained in:
Pascal Massimino
2012-06-28 00:34:23 -07:00
parent 802e012a18
commit fcc69923b9
5 changed files with 378 additions and 137 deletions
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9
src/enc/webpenc.c
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@ -345,8 +345,13 @@ int WebPEncode(const WebPConfig* const config, WebPPicture* const pic) {
if (!config->lossless) {
VP8Encoder* enc = NULL;
if (pic->y == NULL || pic->u == NULL || pic->v == NULL)
return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER);
if (pic->y == NULL || pic->u == NULL || pic->v == NULL) {
if (pic->argb != NULL) {
if (!WebPPictureARGBToYUVA(pic, WEBP_YUV420)) return 0;
} else {
return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER);
}
}
enc = InitVP8Encoder(config, pic);
if (enc == NULL) return 0; // pic->error is already set.