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JPEG decoder: delay conversion to YUV to WebPEncode() call

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We store the raw RGB samples decoded from JPEG, and avoid precision loss.

Note that this may increase the encoding time reported by
cwebp -v, since RGB->YUV now occur during WebPEncode call
(in case of lossy), instead of ReadJPEG().
This also increases the memory use, since we're carying the
source ARGB samples around.

Change-Id: Ic2180206cfc9f5574f391e91c3b89b9d81695d01
This commit is contained in:
skal 2014-07-21 22:26:22 +02:00
parent 6f3202be98
commit fbda2f499c
1 changed files with 1 additions and 0 deletions
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examples/jpegdec.c
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@ -272,6 +272,7 @@ int ReadJPEG(FILE* in_file, WebPPicture* const pic, Metadata* const metadata) {
// WebP conversion. // WebP conversion.
pic->width = width; pic->width = width;
pic->height = height; pic->height = height;
pic->use_argb = 1; // store raw RGB samples
ok = WebPPictureImportRGB(pic, rgb, stride); ok = WebPPictureImportRGB(pic, rgb, stride);
if (!ok) goto Error; if (!ok) goto Error;