Speed up bitblts

[tony_lambregts at telusplanet.net]

One of my kids games (An American Tail) paints the screen between scenes with
repeated calls to bitbit useing 3x3 squares. before this patch it takes over
a minute to paint the screen (on my machine) after the patch it takes less
than 10 seconds.

Change log: Speed up bitblts when the area is small.

files changed: dlls/x11drv/bitblt.c


Index: bitblt.c
===================================================================
RCS file: /home/wine/wine/dlls/x11drv/bitblt.c,v
retrieving revision 1.8
diff -u -r1.8 bitblt.c
--- bitblt.c    16 Sep 2004 20:29:25 -0000      1.8
+++ bitblt.c    3 Dec 2004 04:34:37 -0000
@@ -1571,7 +1571,21 @@
      BOOL result = FALSE;
      INT sSrc, sDst;
      RECT visRectDst, visRectSrc;
+
+    /* if the area is small we don't save time by coping it ourself and
+     * the extra overhead of X11DRV_LockDIBSection() is only required if
+     * we do it ourself.
+     */
+    if (( width * height ) <= 16 )
+    {
+        X11DRV_CoerceDIBSection( physDevDst, DIB_Status_GdiMod, FALSE );
+        if (physDevDst != physDevSrc)
+          X11DRV_CoerceDIBSection( physDevSrc, DIB_Status_GdiMod, FALSE );

+        return BITBLT_InternalStretchBlt( physDevDst, xDst, yDst, width, height,
+                                            physDevSrc, xSrc, ySrc, width, height, rop );
+
+    }
      if (((rop >> 16) & 0x55) == ((rop >> 17) & 0x55)) {
        /* FIXME: seems the ROP doesn't include destination;
         * now if the destination area include the entire dcDst,