3 files changed, 29 insertions, 0 deletions
diff --git a/tests/runner.py b/tests/runner.py
index 68709cc3..3e0e795f 100755
--- a/tests/runner.py
+++ b/tests/runner.py
@@ -9124,6 +9124,9 @@ elif 'browser' in str(sys.argv):
     def test_sdl_canvas_palette(self):
       self.btest('sdl_canvas_palette.c', reference='sdl_canvas_palette.png')
 
+    def test_sdl_canvas_twice(self):
+      self.btest('sdl_canvas_twice.c', reference='sdl_canvas_twice.png')
+
     def test_sdl_maprgba(self):
       self.btest('sdl_maprgba.c', reference='sdl_maprgba.png', reference_slack=3)
 
diff --git a/tests/sdl_canvas_twice.c b/tests/sdl_canvas_twice.c
new file mode 100644
index 00000000..6c6e4802
--- /dev/null
+++ b/tests/sdl_canvas_twice.c
@@ -0,0 +1,26 @@
+#include <SDL/SDL.h>
+
+#if EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
+int main(int argc, char **argv) {
+  SDL_Init(SDL_INIT_VIDEO);
+  SDL_Surface *screen = SDL_SetVideoMode(40, 40, 32, SDL_SWSURFACE);
+
+  SDL_FillRect(screen, NULL, 0xff0000ff);
+  SDL_LockSurface(screen);
+  *((int*)screen->pixels + 95) = 0;
+  SDL_UnlockSurface(screen);
+
+  SDL_FillRect(screen, NULL, 0x00ff00ff); // wipe out previous pixel and fill
+  SDL_LockSurface(screen);
+  *((int*)screen->pixels + 205) = 0;
+  SDL_UnlockSurface(screen);
+
+  SDL_Flip(screen);
+
+  while(1) { SDL_WaitEvent(NULL); }
+
+  return 0;
+}
diff --git a/tests/sdl_canvas_twice.png b/tests/sdl_canvas_twice.png
new file mode 100644
index 00000000..2439164e
--- /dev/null
+++ b/tests/sdl_canvas_twice.png