Ticket #9203: dirty-rect-safety-valve.diff

backends/platform/sdl/graphics.cpp

@@ -858 +858 @@
                 _dirtyRectList[0].y = 0;
                 _dirtyRectList[0].w = width;
                 _dirtyRectList[0].h = height;
+                _dirtyArea = width * height;
         }
 
         // Only draw anything if necessary
@@ -936 +937 @@
         }
 
         _numDirtyRects = 0;
+        _dirtyArea = 0;
         _forceFull = false;
         _mouseNeedsRedraw = false;
 }
@@ -1123 +1125 @@
                 return;
         }
 
+        _dirtyArea += (w * h);
+        if (_dirtyArea > width * height) {
+                _forceFull = true;
+                return;
+        }
+
         if (w > 0 && h > 0) {
                 SDL_Rect *r = &_dirtyRectList[_numDirtyRects++];
 

backends/platform/sdl/sdl.h

@@ -356 +356 @@
         // Dirty rect management
         SDL_Rect _dirtyRectList[NUM_DIRTY_RECT];
         int _numDirtyRects;
+        int32 _dirtyArea;
 
         // Keyboard mouse emulation.  Disabled by fingolfin 2004-12-18.
         // I am keeping the rest of the code in for now, since the joystick