Esme Povirk : gdiplus: Fix some degenerate cases combining infinite regions.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 13b2755d4d4f93f76d7e4f113affba260c857d54
URL:    https://gitlab.winehq.org/wine/wine/-/commit/13b2755d4d4f93f76d7e4f113affba2...

Author: Esme Povirk 
Date:   Mon Feb  5 20:41:23 2024 +0000

gdiplus: Fix some degenerate cases combining infinite regions.

---

dlls/gdiplus/region.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/dlls/gdiplus/region.c b/dlls/gdiplus/region.c
index 058f659561b..9617f492a51 100644
--- a/dlls/gdiplus/region.c
+++ b/dlls/gdiplus/region.c
@@ -1108,7 +1108,10 @@ static GpStatus get_region_hrgn(struct region_element *element, GpGraphics *grap
                     case CombineModeXor: case CombineModeExclude:
                         left = CreateRectRgn(-(1 << 22), -(1 << 22), 1 << 22, 1 << 22);
                         break;
-                    case CombineModeUnion: case CombineModeComplement:
+                    case CombineModeComplement:
+                        *hrgn = CreateRectRgn(0, 0, 0, 0);
+                        return *hrgn ? Ok : OutOfMemory;
+                    case CombineModeUnion:
                         *hrgn = NULL;
                         return Ok;
                 }
@@ -1133,7 +1136,11 @@ static GpStatus get_region_hrgn(struct region_element *element, GpGraphics *grap
                     case CombineModeXor: case CombineModeComplement:
                         right = CreateRectRgn(-(1 << 22), -(1 << 22), 1 << 22, 1 << 22);
                         break;
-                    case CombineModeUnion: case CombineModeExclude:
+                    case CombineModeExclude:
+                        DeleteObject(left);
+                        *hrgn = CreateRectRgn(0, 0, 0, 0);
+                        return *hrgn ? Ok : OutOfMemory;
+                    case CombineModeUnion:
                         DeleteObject(left);
                         *hrgn = NULL;
                         return Ok;