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gdi32: Improve performance of common case of AlphaBlend.

oldstable
Jeff Muizelaar 2012-04-28 11:29:40 -04:00 committed by Alexandre Julliard
parent 6f40cb83e9
commit 2da2f001cf
1 changed files with 26 additions and 7 deletions
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33
dlls/gdi32/dibdrv/primitives.c
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@ -3776,7 +3776,7 @@ static inline BYTE blend_color(BYTE dst, BYTE src, DWORD alpha)
return (src * alpha + dst * (255 - alpha) + 127) / 255;
}
static inline DWORD blend_argb( DWORD dst, DWORD src, DWORD alpha )
static inline DWORD blend_argb_constant_alpha( DWORD dst, DWORD src, DWORD alpha )
{
return (blend_color( dst, src, alpha ) |
blend_color( dst >> 8, src >> 8, alpha ) << 8 |
@ -3784,6 +3784,18 @@ static inline DWORD blend_argb( DWORD dst, DWORD src, DWORD alpha )
blend_color( dst >> 24, src >> 24, alpha ) << 24);
}
static inline DWORD blend_argb( DWORD dst, DWORD src )
{
BYTE b = (BYTE)src;
BYTE g = (BYTE)(src >> 8);
BYTE r = (BYTE)(src >> 16);
DWORD alpha = (BYTE)(src >> 24);
return ((b + ((BYTE)dst * (255 - alpha) + 127) / 255) |
(g + ((BYTE)(dst >> 8) * (255 - alpha) + 127) / 255) << 8 |
(r + ((BYTE)(dst >> 16) * (255 - alpha) + 127) / 255) << 16 |
(alpha + ((BYTE)(dst >> 24) * (255 - alpha) + 127) / 255) << 24);
}
static inline DWORD blend_argb_alpha( DWORD dst, DWORD src, DWORD alpha )
{
BYTE b = ((BYTE)src * alpha + 127) / 255;
@ -3822,13 +3834,20 @@ static void blend_rect_8888(const dib_info *dst, const RECT *rc,
int x, y;
if (blend.AlphaFormat & AC_SRC_ALPHA)
for (y = rc->top; y < rc->bottom; y++, dst_ptr += dst->stride / 4, src_ptr += src->stride / 4)
for (x = 0; x < rc->right - rc->left; x++)
dst_ptr[x] = blend_argb_alpha( dst_ptr[x], src_ptr[x], blend.SourceConstantAlpha );
{
if (blend.SourceConstantAlpha == 255)
for (y = rc->top; y < rc->bottom; y++, dst_ptr += dst->stride / 4, src_ptr += src->stride / 4)
for (x = 0; x < rc->right - rc->left; x++)
dst_ptr[x] = blend_argb( dst_ptr[x], src_ptr[x] );
else
for (y = rc->top; y < rc->bottom; y++, dst_ptr += dst->stride / 4, src_ptr += src->stride / 4)
for (x = 0; x < rc->right - rc->left; x++)
dst_ptr[x] = blend_argb_alpha( dst_ptr[x], src_ptr[x], blend.SourceConstantAlpha );
}
else
for (y = rc->top; y < rc->bottom; y++, dst_ptr += dst->stride / 4, src_ptr += src->stride / 4)
for (x = 0; x < rc->right - rc->left; x++)
dst_ptr[x] = blend_argb( dst_ptr[x], src_ptr[x], blend.SourceConstantAlpha );
for (y = rc->top; y < rc->bottom; y++, dst_ptr += dst->stride / 4, src_ptr += src->stride / 4)
for (x = 0; x < rc->right - rc->left; x++)
dst_ptr[x] = blend_argb_constant_alpha( dst_ptr[x], src_ptr[x], blend.SourceConstantAlpha );
}
static void blend_rect_32(const dib_info *dst, const RECT *rc,