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Ignore alpha channel in freerdp_image_copy

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When copying image data consider formats that only differ on use
of alpha data equal. This allows using the optimized copy routine
instead of the slower color conversion routine. Fixes #3616
This commit is contained in:
Armin Novak 2016-11-24 09:27:19 +01:00
parent 812def37f1
commit 1c4c57821b
2 changed files with 9 additions and 1 deletions
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8
include/freerdp/codec/color.h
View File

@ -100,6 +100,14 @@ typedef struct gdi_palette gdiPalette;
extern "C" {
#endif
/* Compare two color formats but ignore differences in alpha channel.
*/
static INLINE DWORD AreColorFormatsEqualNoAlpha(DWORD first, DWORD second)
{
const DWORD mask = ~(8 << 12);
return (first & mask) == (second & mask);
}
/* Color Space Conversions: http://msdn.microsoft.com/en-us/library/ff566496/ */
/***

2
libfreerdp/codec/color.c
View File

@ -438,7 +438,7 @@ BOOL freerdp_image_copy(BYTE* pDstData, DWORD DstFormat,
srcVMultiplier = -1;
}
if (SrcFormat == DstFormat)
if (AreColorFormatsEqualNoAlpha(SrcFormat, DstFormat))
{
INT32 y;