From: aliguori <aliguori>
cirrus_do_copy() in hw/cirrus_vga.c seems to make some incorrect assumptions
about video memory layout. It tries to convert addresses to coordinates
assuming that one row of data is (width * depth) bytes long. The correct way
seems to be to use the pitch fields in the CirrusVGAState structure instead.
Without this patch, I get lots of screen corruption when I try to drag a window
under X as it's passing the wrong coordinates to the display surface for the
copy. With this patch I can drag a window with no screen corruption.
Signed-off-by: Brian Kress <kre...@moose.net>
Signed-off-by: Anthony Liguori <aligu...@us.ibm.com>
diff --git a/qemu/hw/cirrus_vga.c b/qemu/hw/cirrus_vga.c
index 2666642..866954d 100644
--- a/qemu/hw/cirrus_vga.c
+++ b/qemu/hw/cirrus_vga.c
@@ -731,10 +731,10 @@ static void cirrus_do_copy(CirrusVGAState *s, int dst,
int src, int w, int h)
s->get_resolution((VGAState *)s, &width, &height);
/* extra x, y */
- sx = (src % (width * depth)) / depth;
- sy = (src / (width * depth));
- dx = (dst % (width *depth)) / depth;
- dy = (dst / (width * depth));
+ sx = (src % ABS(s->cirrus_blt_srcpitch)) / depth;
+ sy = (src / ABS(s->cirrus_blt_srcpitch));
+ dx = (dst % ABS(s->cirrus_blt_dstpitch)) / depth;
+ dy = (dst / ABS(s->cirrus_blt_dstpitch));
/* normalize width */
w /= depth;
--
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