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Fixed corruption when copying to the same surface (with the help of 

Tony Lambregts and Lionel Ulmer).
This commit is contained in:
Alexandre Julliard 2002-07-10 23:10:54 +00:00
parent ee2ecf22ff
commit a80a814234
1 changed files with 34 additions and 6 deletions
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38
dlls/ddraw/dsurface/dib.c
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@ -482,11 +482,39 @@ DIB_DirectDrawSurface_Blt(LPDIRECTDRAWSURFACE7 iface, LPRECT rdst,
/* No stretching in either direction. This needs to be as
* fast as possible */
sbuf = sbase;
for (y = 0; y < dstheight; y++) {
memcpy(dbuf, sbuf, width);
sbuf += sdesc.u1.lPitch;
dbuf += ddesc.u1.lPitch;
}
/* check for overlapping surfaces */
if (src != iface || xdst.top < xsrc.top ||
xdst.right <= xsrc.left || xsrc.right <= xdst.left)
{
/* no overlap, or dst above src, so copy from top downwards */
for (y = 0; y < dstheight; y++)
{
memcpy(dbuf, sbuf, width);
sbuf += sdesc.u1.lPitch;
dbuf += ddesc.u1.lPitch;
}
}
else if (xdst.top > xsrc.top) /* copy from bottom upwards */
{
sbuf += (sdesc.u1.lPitch*dstheight);
dbuf += (ddesc.u1.lPitch*dstheight);
for (y = 0; y < dstheight; y++)
{
sbuf -= sdesc.u1.lPitch;
dbuf -= ddesc.u1.lPitch;
memcpy(dbuf, sbuf, width);
}
}
else /* src and dst overlapping on the same line, use memmove */
{
for (y = 0; y < dstheight; y++)
{
memmove(dbuf, sbuf, width);
sbuf += sdesc.u1.lPitch;
dbuf += ddesc.u1.lPitch;
}
}
} else {
/* Stretching in Y direction only */
for (y = sy = 0; y < dstheight; y++, sy += yinc) {