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wicdec: support alpha from WebP WIC decoder

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the container check may not be strictly necessary now that the alpha
check has matured and the library will detect usable alpha, but it's
safer to fix this case first before making larger changes.

Bug: webp:533
Change-Id: I2e1ba42156970d579a52bd183707a037e65fd900
This commit is contained in:
James Zern 2021-07-16 12:16:54 -07:00
parent 26f4aa0115
commit a89a3230c9
1 changed files with 5 additions and 0 deletions
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5
imageio/wicdec.c
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@ -273,10 +273,15 @@ int ReadPictureWithWIC(const char* const filename,
WICPixelFormatGUID src_pixel_format = GUID_WICPixelFormatUndefined;
const WICFormatImporter* importer = NULL;
GUID src_container_format = GUID_NULL_;
// From Windows Kits\10\Include\10.0.19041.0\um\wincodec.h
WEBP_DEFINE_GUID(GUID_ContainerFormatWebp_,
0xe094b0e2, 0x67f2, 0x45b3,
0xb0, 0xea, 0x11, 0x53, 0x37, 0xca, 0x7c, 0xf3);
static const GUID* kAlphaContainers[] = {
&GUID_ContainerFormatBmp,
&GUID_ContainerFormatPng,
&GUID_ContainerFormatTiff,
&GUID_ContainerFormatWebp_,
NULL
};
int has_alpha = 0;