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Fix AlphaBlend() to extract the right part of the source DIB.

This commit is contained in:
Frank Richter 2005-08-15 14:46:31 +00:00 committed by Alexandre Julliard
parent 61aabd66f5
commit a6f081e0db
1 changed files with 11 additions and 4 deletions
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15
dlls/x11drv/xrender.c
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@ -1628,8 +1628,8 @@ BOOL X11DRV_AlphaBlend(X11DRV_PDEVICE *devDst, INT xDst, INT yDst, INT widthDst,
XImage *image;
GC gc;
XGCValues gcv;
char *dstbits, *data;
int y;
BYTE *dstbits, *data;
int y, y2;
POINT pts[2];
BOOL top_down = FALSE;
@ -1682,8 +1682,15 @@ 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;
y2 = ySrc;
y = y2 + heightSrc;
}
for(y = ySrc + heightSrc - 1; y >= ySrc; y--) {
else
{
y = dib.dsBmih.biHeight - ySrc - 1;
y2 = y - heightSrc;
}
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;
@ -1734,7 +1741,7 @@ BOOL X11DRV_AlphaBlend(X11DRV_PDEVICE *devDst, INT xDst, INT yDst, INT widthDst,
}
#endif
pXRenderComposite(gdi_display, PictOpOver, src_pict, 0, dst_pict,
xSrc, ySrc, 0, 0,
0, 0, 0, 0,
xDst + devDst->org.x, yDst + devDst->org.y, widthDst, heightDst);