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winex11: Implement AlphaBlend mode for the case where SourceConstantAlpha is combined with source alpha.

This commit is contained in:
Peter Urbanec 2009-11-11 02:58:41 +11:00 committed by Alexandre Julliard
parent 872feb47c4
commit ab081aa845
1 changed files with 28 additions and 7 deletions
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35
dlls/winex11.drv/xrender.c
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@ -1956,9 +1956,6 @@ BOOL CDECL X11DRV_AlphaBlend(X11DRV_PDEVICE *devDst, INT xDst, INT yDst, INT wid
return FALSE;
}
if ((blendfn.AlphaFormat & AC_SRC_ALPHA) && blendfn.SourceConstantAlpha != 0xff)
FIXME("Ignoring SourceConstantAlpha %d for AC_SRC_ALPHA\n", blendfn.SourceConstantAlpha);
if(dib.dsBm.bmBitsPixel != 32) {
FIXME("not a 32 bpp dibsection\n");
return FALSE;
@ -1979,11 +1976,35 @@ BOOL CDECL X11DRV_AlphaBlend(X11DRV_PDEVICE *devDst, INT xDst, INT yDst, INT wid
if (blendfn.AlphaFormat & AC_SRC_ALPHA)
{
for(; y >= y2; y--)
if (blendfn.SourceConstantAlpha == 0xff)
{
memcpy(dstbits, (char *)dib.dsBm.bmBits + y * dib.dsBm.bmWidthBytes + xSrc * 4,
widthSrc * 4);
dstbits += (top_down ? -1 : 1) * widthSrc;
for (; y >= y2; y--)
{
memcpy(dstbits, (char *)dib.dsBm.bmBits + y * dib.dsBm.bmWidthBytes + xSrc * 4,
widthSrc * 4);
dstbits += (top_down ? -1 : 1) * widthSrc;
}
}
else
{
/* SourceConstantAlpha combined with source alpha */
for (; y >= y2; y--)
{
int x;
DWORD *srcbits = (DWORD *)((char *)dib.dsBm.bmBits + y * dib.dsBm.bmWidthBytes) + xSrc;
for (x = 0; x < widthSrc; x++)
{
DWORD argb = *srcbits++;
BYTE *s = (BYTE *) &argb;
s[0] = (s[0] * blendfn.SourceConstantAlpha) / 255;
s[1] = (s[1] * blendfn.SourceConstantAlpha) / 255;
s[2] = (s[2] * blendfn.SourceConstantAlpha) / 255;
s[3] = (s[3] * blendfn.SourceConstantAlpha) / 255;
*dstbits++ = argb;
}
if (top_down) /* we traversed the row forward so we should go back by two rows */
dstbits -= 2 * widthSrc;
}
}
}
else