(svn r3742) -codechange: [OSX] changed an assert to use the new error window and added another two to show if the screen buffer fails for some reason in cocoa driver (instead of just crashing)

video/cocoa_v.m

@@ -847,6 +847,10 @@ static void QZ_SetPortAlphaOpaque(void)
 	_cocoa_video_data.realpixels = GetPixBaseAddr(GetPortPixMap(thePort));
 	_cocoa_video_data.pitch      = GetPixRowBytes(GetPortPixMap(thePort));
 
+	if (_cocoa_video_data.realpixels == NULL) {
+		ShowMacErrorDialog("Error: failure to locate screen buffer in the OS");
+	}
+
 	/* _cocoa_video_data.realpixels now points to the window's pixels
 	 * We want it to point to the *view's* pixels
 	 */
@@ -862,7 +866,9 @@ static void QZ_SetPortAlphaOpaque(void)
 	/* Allocate new buffer */
 	free(_cocoa_video_data.pixels);
 	_cocoa_video_data.pixels = (uint8*)malloc(newViewFrame.size.width * newViewFrame.size.height);
-	assert(_cocoa_video_data.pixels != NULL);
+	if (_cocoa_video_data.pixels == NULL) {
+		ShowMacErrorDialog("Error: failed to allocate frame buffer");
+	}
 
 
 	/* Tell the game that the resolution changed */
@@ -1352,6 +1358,10 @@ static const char* QZ_SetVideoFullScreen(int width, int height)
 	_cocoa_video_data.realpixels = (uint8*)CGDisplayBaseAddress(_cocoa_video_data.display_id);
 	_cocoa_video_data.pitch  = CGDisplayBytesPerRow(_cocoa_video_data.display_id);
 
+	if (_cocoa_video_data.realpixels == NULL ) {
+		ShowMacErrorDialog("Error: failure to locate screen buffer in the OS for full screen mode");
+	}
+
 	_cocoa_video_data.width = CGDisplayPixelsWide(_cocoa_video_data.display_id);
 	_cocoa_video_data.height = CGDisplayPixelsHigh(_cocoa_video_data.display_id);
 	_cocoa_video_data.fullscreen = true;