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for ReadXXXX() image-readers, use the value of pic->use_argb

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This is to infer the needed conversion to YUV(A) or RGB(A).

This is useful to avoid some conversion steps between ARGB and YUVA.
For instance, if the input file is a JPEG, we decode to RGB and
convert to YUV right away, without the intermediate step to ARGB.

The only caveat is that cropping/scaling might give slightly different result,
because of YUV420 downsampling. Therefore, we omit this feature
at cwebp level, when -crop or -rescale is used.

Change-Id: I5a3abe5108982f2a4570e841e3d9baffc73f5bee
This commit is contained in:
Pascal Massimino
2015-10-27 22:54:11 +01:00
parent 469ba2cdfd
commit 7861578bd6
11 changed files with 17 additions and 12 deletions
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2
examples/jpegdec.h
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@ -23,7 +23,7 @@ struct Metadata;
struct WebPPicture;
// Reads a JPEG from 'in_file', returning the decoded output in 'pic'.
// The output is RGB.
// The output is RGB or YUV depending on pic->use_argb value.
// Returns true on success.
int ReadJPEG(FILE* in_file, struct WebPPicture* const pic,
struct Metadata* const metadata);