[Qemu-devel] [PATCH] cirrus: fix off-by-one in cirrus_bitblt_rop_bkwd_transp_*_16

[Gerd Hoffmann]

The switch from pointers to addresses (commit
026aeffcb4752054830ba203020ed6eb05bcaba8 and
ffaf857778286ca54e3804432a2369a279e73aa7) added
a off-by-one bug to 16bit backward blits.  Fix.

Reported-by: 李强 <address@hidden>
Signed-off-by: Gerd Hoffmann <address@hidden>
---
 hw/display/cirrus_vga_rop.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/display/cirrus_vga_rop.h b/hw/display/cirrus_vga_rop.h
index c61a677..0841b9e 100644
--- a/hw/display/cirrus_vga_rop.h
+++ b/hw/display/cirrus_vga_rop.h
@@ -219,7 +219,7 @@ glue(glue(cirrus_bitblt_rop_bkwd_transp_, 
ROP_NAME),_16)(CirrusVGAState *s,
     srcpitch += bltwidth;
     for (y = 0; y < bltheight; y++) {
         for (x = 0; x < bltwidth; x+=2) {
-            ROP_OP_TR_16(s, dstaddr, cirrus_src16(s, srcaddr), transp);
+            ROP_OP_TR_16(s, dstaddr - 1, cirrus_src16(s, srcaddr - 1), transp);
             dstaddr -= 2;
             srcaddr -= 2;
         }
-- 
1.8.3.1