diff --git a/sc2/src/sc2code/libs/graphics/drawcmd.h b/sc2/src/sc2code/libs/graphics/drawcmd.h
index 8701a5f85..4a3172e92 100644
--- a/sc2/src/sc2code/libs/graphics/drawcmd.h
+++ b/sc2/src/sc2code/libs/graphics/drawcmd.h
@@ -41,6 +41,7 @@ enum
 	TFB_DRAWCOMMANDTYPE_DELETEDATA,
 	TFB_DRAWCOMMANDTYPE_SENDSIGNAL,
 	TFB_DRAWCOMMANDTYPE_REINITVIDEO,
+	TFB_DRAWCOMMANDTYPE_CALLBACK,
 };
 
 typedef struct tfb_dc_line
@@ -135,6 +136,12 @@ typedef struct tfb_dc_reinit_video
 	int driver, flags, width, height;
 } TFB_DrawCommand_ReinitVideo;
 
+typedef struct tfb_dc_callback
+{
+	void (*callback)(void *arg);
+	void *arg;
+} TFB_DrawCommand_Callback;
+
 typedef struct tfb_drawcommand
 {
 	int Type;
@@ -153,6 +160,7 @@ typedef struct tfb_drawcommand
 		TFB_DrawCommand_DeleteData deletedata;
 		TFB_DrawCommand_SendSignal sendsignal;
 		TFB_DrawCommand_ReinitVideo reinitvideo;
+		TFB_DrawCommand_Callback callback;
 	} data;
 } TFB_DrawCommand;
 
diff --git a/sc2/src/sc2code/libs/graphics/sdl/canvas.c b/sc2/src/sc2code/libs/graphics/sdl/canvas.c
index 6059b2265..4a9f29d12 100644
--- a/sc2/src/sc2code/libs/graphics/sdl/canvas.c
+++ b/sc2/src/sc2code/libs/graphics/sdl/canvas.c
@@ -1541,6 +1541,14 @@ TFB_DrawCanvas_Unlock (TFB_Canvas canvas)
 	SDL_UnlockSurface (surf);
 }
 
+// This function should only be called from the graphics thread,
+// like from a TFB_DrawCommand_Callback command.
+TFB_Canvas
+TFB_DrawCanvas_GetScreenCanvas (SCREEN screen)
+{
+	return (TFB_Canvas) SDL_Screens[screen];
+}
+
 void
 TFB_DrawCanvas_GetScreenFormat (TFB_PixelFormat *fmt)
 {
diff --git a/sc2/src/sc2code/libs/graphics/sdl/sdl_common.c b/sc2/src/sc2code/libs/graphics/sdl/sdl_common.c
index 1017832ac..25f38ada6 100644
--- a/sc2/src/sc2code/libs/graphics/sdl/sdl_common.c
+++ b/sc2/src/sc2code/libs/graphics/sdl/sdl_common.c
@@ -607,7 +607,7 @@ TFB_ComputeFPS (void)
 }
 
 void
-TFB_FlushGraphics () // Only call from main thread!!
+TFB_FlushGraphics (void) // Only call from main thread!!
 {
 	int commands_handled;
 	BOOLEAN livelock_deterrence;
@@ -908,6 +908,11 @@ TFB_FlushGraphics () // Only call from main thread!!
 				}
 				break;
 			}
+		case TFB_DRAWCOMMANDTYPE_CALLBACK:
+			{
+				DC.data.callback.callback (DC.data.callback.arg);
+				break;
+			}
 		}
 	}
 	
diff --git a/sc2/src/sc2code/libs/graphics/tfb_draw.c b/sc2/src/sc2code/libs/graphics/tfb_draw.c
index 09e8842eb..a76bd79e2 100644
--- a/sc2/src/sc2code/libs/graphics/tfb_draw.c
+++ b/sc2/src/sc2code/libs/graphics/tfb_draw.c
@@ -211,7 +211,7 @@ TFB_DrawScreen_WaitForSignal (void)
 	DrawCommand.data.sendsignal.sem = s;
 	Lock_DCQ (1);
 	TFB_BatchReset ();
-	TFB_EnqueueDrawCommand(&DrawCommand);
+	TFB_EnqueueDrawCommand (&DrawCommand);
 	Unlock_DCQ();
 	SetSemaphore (s);	
 }
@@ -225,6 +225,16 @@ TFB_DrawScreen_ReinitVideo (int driver, int flags, int width, int height)
 	DrawCommand.data.reinitvideo.flags = flags;
 	DrawCommand.data.reinitvideo.width = width;
 	DrawCommand.data.reinitvideo.height = height;
+	TFB_EnqueueDrawCommand (&DrawCommand);
+}
+
+void
+TFB_DrawScreen_Callback (void (*callback) (void *arg), void *arg)
+{
+	TFB_DrawCommand DrawCommand;
+	DrawCommand.Type = TFB_DRAWCOMMANDTYPE_CALLBACK;
+	DrawCommand.data.callback.callback = callback;
+	DrawCommand.data.callback.arg = arg;
 	TFB_EnqueueDrawCommand(&DrawCommand);
 }
 
@@ -417,3 +427,4 @@ TFB_DrawImage_FixScaling (TFB_Image *image, int target, int type)
 		image->last_scale = target;
 	}
 }
+
diff --git a/sc2/src/sc2code/libs/graphics/tfb_draw.h b/sc2/src/sc2code/libs/graphics/tfb_draw.h
index d3b113c55..be97f3c53 100644
--- a/sc2/src/sc2code/libs/graphics/tfb_draw.h
+++ b/sc2/src/sc2code/libs/graphics/tfb_draw.h
@@ -100,6 +100,7 @@ void TFB_DrawScreen_DeleteData (void *);
 void TFB_DrawScreen_WaitForSignal (void);
 void TFB_DrawScreen_ReinitVideo (int driver, int flags, int width, int height);
 void TFB_DrawScreen_SetPalette (int paletteIndex, int r, int g, int b);
+void TFB_DrawScreen_Callback (void (*callback) (void *arg), void *arg);
 
 TFB_Image *TFB_DrawImage_New (TFB_Canvas canvas);
 TFB_Image *TFB_DrawImage_CreateForScreen (int w, int h, BOOLEAN withalpha);
@@ -152,9 +153,10 @@ void TFB_DrawCanvas_CopyTransparencyInfo (TFB_Canvas src, TFB_Canvas dst);
 void TFB_DrawCanvas_Initialize (void);
 void TFB_DrawCanvas_Lock (TFB_Canvas canvas);
 void TFB_DrawCanvas_Unlock (TFB_Canvas canvas);
+TFB_Canvas TFB_DrawCanvas_GetScreenCanvas (SCREEN screen);
 void TFB_DrawCanvas_GetScreenFormat (TFB_PixelFormat *fmt);
 int TFB_DrawCanvas_GetStride (TFB_Canvas canvas);
-void* TFB_DrawCanvas_GetLine (TFB_Canvas canvas, int line);
+void *TFB_DrawCanvas_GetLine (TFB_Canvas canvas, int line);
 void TFB_DrawCanvas_GetPixel (TFB_Canvas canvas, int x, int y, int *r, int *g, int *b);
 
 #endif