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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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3
examples/tiffdec.h
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@ -20,8 +20,9 @@ struct Metadata;
struct WebPPicture;
// Reads a TIFF from 'filename', returning the decoded output in 'pic'.
// Output is RGBA or YUVA, depending on pic->use_argb value.
// If 'keep_alpha' is true and the TIFF has an alpha channel, the output is RGBA
// otherwise it will be RGB.
// or YUVA. Otherwise, alpha channel is dropped and output is RGB or YUV.
// Returns true on success.
int ReadTIFF(const char* const filename,
struct WebPPicture* const pic, int keep_alpha,