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speed up the DrawIconEx alpha maths a little bit

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svn path=/trunk/; revision=29952
This commit is contained in:
Ged Murphy 2007-10-29 13:29:26 +00:00
parent fb7e8a4777
commit af97264c80
1 changed files with 7 additions and 13 deletions
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20
reactos/subsystems/win32/win32k/ntuser/cursoricon.c
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@ -1520,6 +1520,7 @@ UserDrawIconEx(
BITMAPOBJ *BitmapObj = NULL;
PBYTE pBits = NULL;
BLENDFUNCTION BlendFunc;
DWORD Pixel;
BYTE Red, Green, Blue, Alpha;
DWORD Count = 0;
INT i, j;
@ -1548,23 +1549,16 @@ UserDrawIconEx(
{
for (j = 0; j < cxWidth; j++)
{
DWORD OrigPixel = 0;
DWORD AlphaPixel = 0;
Pixel = *(DWORD *)(pBits + Count);
OrigPixel = *(DWORD *)(pBits + Count);
Alpha = ((BYTE)(Pixel >> 24) & 0xff);
Red = (BYTE)((OrigPixel >> 0) & 0xff);
Green = (BYTE)((OrigPixel >> 8) & 0xff);
Blue = (BYTE)((OrigPixel >> 16) & 0xff);
Alpha = (BYTE)((OrigPixel >> 24) & 0xff);
Red = (((BYTE)(Pixel >> 0) & 0xff) * Alpha) / 0xff;
Green = (((BYTE)(Pixel >> 8) & 0xff) * Alpha) / 0xff;
Blue = (((BYTE)(Pixel >> 16) & 0xff) * Alpha) / 0xff;
Red = (Red * Alpha) / 0xff;
Green = (Green * Alpha) / 0xff;
Blue = (Blue * Alpha) / 0xff;
*(DWORD *)(pBits + Count) = (DWORD)(Red | (Green << 8) | (Blue << 16) | (Alpha << 24));
AlphaPixel = (DWORD)(Red | (Green << 8) | (Blue << 16) | (Alpha << 24));
*(DWORD *)(pBits + Count) = AlphaPixel;
Count += sizeof (DWORD);
}
}