Akihiro Sagawa : gdi32: Adjust destination coordinates in some special cases.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 9f458df88c719f095deb859e163f3c2296df3f43
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=9f458df88c719f095deb859e1...

Author: Akihiro Sagawa 
Date:   Sat Oct 13 22:31:02 2018 +0900

gdi32: Adjust destination coordinates in some special cases.

When the source rectangle needs to flip and it doesn't fit in the
source device area, the destination image is flipped but the
destination area isn't flipped.  GdiAlphaBlend doesn't support
mirroring, the above isn't applicable.

Signed-off-by: Akihiro Sagawa 
Signed-off-by: Huw Davies 
Signed-off-by: Alexandre Julliard

---

dlls/gdi32/bitblt.c       | 26 ++++++++++++++++++++++----
 dlls/gdi32/tests/bitmap.c |  6 +++---
 2 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/dlls/gdi32/bitblt.c b/dlls/gdi32/bitblt.c
index 6f5af64..abca822 100644
--- a/dlls/gdi32/bitblt.c
+++ b/dlls/gdi32/bitblt.c
@@ -60,12 +60,30 @@ BOOL intersect_vis_rectangles( struct bitblt_coords *dst, struct bitblt_coords *
         offset_rect( &rect,
                      -src->x - (src->width < 0 ? 1 : 0),
                      -src->y - (src->height < 0 ? 1 : 0));
-        rect.left   = dst->x + rect.left * dst->width / src->width;
-        rect.top    = dst->y + rect.top * dst->height / src->height;
-        rect.right  = dst->x + rect.right * dst->width / src->width;
-        rect.bottom = dst->y + rect.bottom * dst->height / src->height;
+        rect.left   = rect.left * dst->width / src->width;
+        rect.top    = rect.top * dst->height / src->height;
+        rect.right  = rect.right * dst->width / src->width;
+        rect.bottom = rect.bottom * dst->height / src->height;
         order_rect( &rect );

+        /* when the source rectangle needs to flip and it doesn't fit in the source device
+           area, the destination area isn't flipped. So, adjust destination coordinates */
+        if (src->width < 0 && dst->width > 0 &&
+            (src->x + src->width + 1 < src->visrect.left || src->x > src->visrect.right))
+            dst->x += (dst->width - rect.right) - rect.left;
+        else if (src->width > 0 && dst->width < 0 &&
+                 (src->x < src->visrect.left || src->x + src->width > src->visrect.right))
+            dst->x -= rect.right - (dst->width - rect.left);
+
+        if (src->height < 0 && dst->height > 0 &&
+            (src->y + src->height + 1 < src->visrect.top || src->y > src->visrect.bottom))
+            dst->y += (dst->height - rect.bottom) - rect.top;
+        else if (src->height > 0 && dst->height < 0 &&
+                 (src->y < src->visrect.top || src->y + src->height > src->visrect.bottom))
+            dst->y -= rect.bottom - (dst->height - rect.top);
+
+        offset_rect( &rect, dst->x, dst->y );
+
         /* avoid rounding errors */
         rect.left--;
         rect.top--;
diff --git a/dlls/gdi32/tests/bitmap.c b/dlls/gdi32/tests/bitmap.c
index a902edc..4622de9 100644
--- a/dlls/gdi32/tests/bitmap.c
+++ b/dlls/gdi32/tests/bitmap.c
@@ -3263,13 +3263,13 @@ static void test_StretchBlt(void)
     memset( expected, 0, get_dib_image_size( &biDst ) );
     expected[102] = 0x76543210, expected[103] = 0xfedcba98;
     expected[117] = 0x0000cccc, expected[118] = 0x0000f0f0, expected[119] = 0x0000ff00;
-    todo_wine check_StretchBlt_stretch(hdcDst, hdcSrc, &biDst, dstBuffer, srcBuffer,
+    check_StretchBlt_stretch(hdcDst, hdcSrc, &biDst, dstBuffer, srcBuffer,
                              0, 0, 8, 8, 2, 2, -8, -8, expected, __LINE__);

memset( expected, 0, get_dib_image_size( &biDst ) );
     expected[85] = 0x76543210, expected[86] = 0xfedcba98;
     expected[99] = 0x0000aaaa, expected[100] = 0x0000cccc, expected[101] = 0x0000f0f0, expected[102] = 0x0000ff00;
-    todo_wine check_StretchBlt_stretch(hdcDst, hdcSrc, &biDst, dstBuffer, srcBuffer,
+    check_StretchBlt_stretch(hdcDst, hdcSrc, &biDst, dstBuffer, srcBuffer,
                              8, 8, -18, -18, 0, 0, 18, 18, expected, __LINE__);

SelectObject(hdcDst, oldDst);
@@ -3595,7 +3595,7 @@ static void test_StretchDIBits(void)

expected[0] = 0x00000000, expected[1] = 0x00000000;
     expected[2] = 0xFEEDFACE, expected[3] = 0x00000000;
-    todo_wine ret = check_StretchDIBits_stretch(hdcDst, dstBuffer, srcBuffer,
+    ret = check_StretchDIBits_stretch(hdcDst, dstBuffer, srcBuffer,
                                       1, 1, -2, -2, 1, 1, 2, 2, expected, __LINE__);
     ok( ret == 2, "got ret %d\n", ret );