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winex11.drv: Support GdiAlphaBlend with blendfn.AlphaFormat == 0.

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This commit is contained in:
Mikolaj Zalewski 2007-08-30 10:43:20 -07:00 committed by Alexandre Julliard
parent 9dc6f6cf54
commit ee747f3d70
1 changed files with 33 additions and 6 deletions
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39
dlls/winex11.drv/xrender.c
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@ -1524,7 +1524,7 @@ BOOL X11DRV_AlphaBlend(X11DRV_PDEVICE *devDst, INT xDst, INT yDst, INT widthDst,
XImage *image;
GC gc;
XGCValues gcv;
BYTE *dstbits, *data;
DWORD *dstbits, *data;
int y, y2;
POINT pts[2];
BOOL top_down = FALSE;
@ -1580,6 +1580,9 @@ BOOL X11DRV_AlphaBlend(X11DRV_PDEVICE *devDst, INT xDst, INT yDst, INT widthDst,
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;
@ -1588,7 +1591,7 @@ BOOL X11DRV_AlphaBlend(X11DRV_PDEVICE *devDst, INT xDst, INT yDst, INT widthDst,
if(dib.dsBmih.biHeight < 0) { /* top-down dib */
top_down = TRUE;
dstbits += widthSrc * (heightSrc - 1) * 4;
dstbits += widthSrc * (heightSrc - 1);
y2 = ySrc;
y = y2 + heightSrc - 1;
}
@ -1597,10 +1600,34 @@ BOOL X11DRV_AlphaBlend(X11DRV_PDEVICE *devDst, INT xDst, INT yDst, INT widthDst,
y = dib.dsBmih.biHeight - ySrc - 1;
y2 = y - heightSrc + 1;
}
for(; y >= y2; y--) {
memcpy(dstbits, (char *)dib.dsBm.bmBits + y * dib.dsBm.bmWidthBytes + xSrc * 4,
widthSrc * 4);
dstbits += (top_down ? -1 : 1) * widthSrc * 4;
if (blendfn.AlphaFormat & AC_SRC_ALPHA)
{
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
{
DWORD source_alpha = (DWORD)blendfn.SourceConstantAlpha << 24;
int x;
for(; y >= y2; y--)
{
DWORD *srcbits = (DWORD *)((char *)dib.dsBm.bmBits + y * dib.dsBm.bmWidthBytes) + xSrc;
for (x = 0; x < widthSrc; x++)
{
DWORD argb = *srcbits++;
argb = (argb & 0xffffff) | source_alpha;
*dstbits++ = argb;
}
if (top_down) /* we traversed the row forward so we should go back by two rows */
dstbits -= 2 * widthSrc;
}
}
wine_tsx11_lock();