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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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1
examples/tiffdec.c
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@ -100,7 +100,6 @@ int ReadTIFF(const char* const filename,
#ifdef WORDS_BIGENDIAN
TIFFSwabArrayOfLong(raster, width * height);
#endif
pic->use_argb = 1;
ok = keep_alpha
? WebPPictureImportRGBA(pic, (const uint8_t*)raster, stride)
: WebPPictureImportRGBX(pic, (const uint8_t*)raster, stride);