Alexandre Julliard : gdi32: Take into account the DIB rectangles when determining overlap for blits.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 319a87c86e8f6faf0ee1bbe2dba5933843d59c07
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=319a87c86e8f6faf0ee1bbe2db...

Author: Alexandre Julliard 
Date:   Mon Jun  4 20:44:24 2012 +0200

gdi32: Take into account the DIB rectangles when determining overlap for blits.

---

dlls/gdi32/dibdrv/bitblt.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/dlls/gdi32/dibdrv/bitblt.c b/dlls/gdi32/dibdrv/bitblt.c
index 724b704..bac5a60 100644
--- a/dlls/gdi32/dibdrv/bitblt.c
+++ b/dlls/gdi32/dibdrv/bitblt.c
@@ -438,11 +438,11 @@ static int get_overlap( const dib_info *dst, const RECT *dst_rect,
     int height, ret = 0;

if (dst->stride != src->stride) return 0;  /* can't be the same dib */
-    if (dst_rect->right <= src_rect->left) return 0;
-    if (dst_rect->left >= src_rect->right) return 0;
+    if (dst->rect.left + dst_rect->right <= src->rect.left + src_rect->left) return 0;
+    if (dst->rect.left + dst_rect->left >= src->rect.left + src_rect->right) return 0;

-    src_top = (const char *)src->bits.ptr + src_rect->top * src->stride;
-    dst_top = (const char *)dst->bits.ptr + dst_rect->top * dst->stride;
+    src_top = (const char *)src->bits.ptr + (src->rect.top + src_rect->top) * src->stride;
+    dst_top = (const char *)dst->bits.ptr + (dst->rect.top + dst_rect->top) * dst->stride;
     height = (dst_rect->bottom - dst_rect->top) * dst->stride;

if (dst->stride > 0)
@@ -460,8 +460,8 @@ static int get_overlap( const dib_info *dst, const RECT *dst_rect,
         else if (dst_top < src_top) ret |= OVERLAP_BELOW;
     }

-    if (dst_rect->left < src_rect->left) ret |= OVERLAP_LEFT;
-    else if (dst_rect->left > src_rect->left) ret |= OVERLAP_RIGHT;
+    if (dst->rect.left + dst_rect->left < src->rect.left + src_rect->left) ret |= OVERLAP_LEFT;
+    else if (dst->rect.left + dst_rect->left > src->rect.left + src_rect->left) ret |= OVERLAP_RIGHT;

return ret;
 }