#800: add paint option to do everything (delta, decoding, csc, etc) b…

…ut without actually updating the back buffer or the screen

git-svn-id: https://xpra.org/svn/Xpra/trunk@13027 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/client/gl/gl_window_backing_base.py

@@ -724,6 +724,9 @@ def do_paint_rgb(self, rgb_format, img_data, x, y, width, height, rowstride, opt
             log("%s._do_paint_rgb(..) no context!", self)
             fire_paint_callbacks(callbacks, False, "no opengl context")
             return
+        if not options.get("paint", True):
+            fire_paint_callbacks(callbacks)
+            return
 
         try:
             upload, img_data = self.pixels_for_upload(img_data)

src/xpra/client/window_backing_base.py

@@ -273,6 +273,9 @@ def do_paint_rgb(self, rgb_format, img_data, x, y, width, height, rowstride, opt
             the actual paint code is in _do_paint_rgb[24|32]
         """
         try:
+            if not options.get("paint", True):
+                fire_paint_callbacks(callbacks)
+                return
             if self._backing is None:
                 fire_paint_callbacks(callbacks, -1, "no backing")
                 return