gdiplus: Fix error when drawing from a rectangle outside bitmap bounds.

[Vincent Povirk]

For bug 37394.
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From 32c641eff70c9f3d02feeb21baeb418786a144df Mon Sep 17 00:00:00 2001
From: Vincent Povirk <vincent at codeweavers.com>
Date: Tue, 28 Oct 2014 16:09:57 -0500
Subject: [PATCH] gdiplus: Fix error when drawing from a rectangle outside
 bitmap bounds.

---
 dlls/gdiplus/graphics.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/dlls/gdiplus/graphics.c b/dlls/gdiplus/graphics.c
index d192bf2..b34b31c 100644
--- a/dlls/gdiplus/graphics.c
+++ b/dlls/gdiplus/graphics.c
@@ -827,6 +827,15 @@ static void get_bitmap_sample_size(InterpolationMode interpolation, WrapMode wra
             right = bitmap->width-1;
         if (bottom >= bitmap->height)
             bottom = bitmap->height-1;
+        if (bottom <= top || right <= left)
+        {
+            /* entirely outside image, just sample a pixel so we don't have to
+             * special-case this later */
+            left = 0;
+            top = 0;
+            right = 1;
+            bottom = 1;
+        }
     }
     else
     {
-- 
2.1.0