commit bb9c1878c3aeb2b0ee17b57be23c07b661ade45c
author Vincent Povirk <vincent@codeweavers.com> Thu Apr 15 15:13:34 2010 -0500
committer Alexandre Julliard <julliard@winehq.org> Fri Apr 16 12:12:37 2010 +0200
tree c7887f8847edabcfab476aa73e5bd998d960db8d
parent 7791f02fd9de1e2e89603d55b2f8b693b2a155e5

gdiplus: Correct the coordinate transform for non-rectangular parallelograms.

Apparently matrices in gdiplus don't work the way I think they do.

dlls/gdiplus/graphics.c

diff --git a/dlls/gdiplus/graphics.c b/dlls/gdiplus/graphics.c
index 5a75fd0..b0cba47 100644
--- a/dlls/gdiplus/graphics.c
+++ b/dlls/gdiplus/graphics.c
@@ -2030,11 +2030,11 @@
             }
 
             m11 = (ptf[1].X - ptf[0].X) / srcwidth;
-            m12 = (ptf[2].X - ptf[0].X) / srcheight;
-            mdx = ptf[0].X - m11 * srcx - m12 * srcy;
-            m21 = (ptf[1].Y - ptf[0].Y) / srcwidth;
+            m21 = (ptf[2].X - ptf[0].X) / srcheight;
+            mdx = ptf[0].X - m11 * srcx - m21 * srcy;
+            m12 = (ptf[1].Y - ptf[0].Y) / srcwidth;
             m22 = (ptf[2].Y - ptf[0].Y) / srcheight;
-            mdy = ptf[0].Y - m21 * srcx - m22 * srcy;
+            mdy = ptf[0].Y - m12 * srcx - m22 * srcy;
 
             stat = GdipCreateMatrix2(m11, m12, m21, m22, mdx, mdy, &dst_to_src);
             if (stat != Ok) return stat;