Change rendering system to use function pointers, see Issue 31 c38 : preliminary work to make the same executable handle Layers or Anims. Fixed an old issue where Lasso-ing a brush with right mouse button wouldn't erase cleanly (visual). Fixed an old issue where picking colors in layer 5 would not 'see' through layers.

git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1906 416bcca6-2ee7-4201-b75f-2eb2f807beb1

src/pages.c

@@ -678,6 +678,7 @@ void Update_screen_targets(void)
     Main_screen=Main_backups->Pages->Image[Main_current_layer].Pixels;
     Screen_backup=Main_backups->Pages->Next->Image[Main_current_layer].Pixels;
   #endif
+  Update_pixel_renderer();
 }
 
 /// Update all the special image buffers, if necessary.