Surface.markDirty
void markDirty()Tells cairo that drawing has been done to surface using means other than cairo, and that cairo should reread any cached areas. Note that you must call [cairo.surface.Surface.flush] before doing such drawing.
void markDirty()Tells cairo that drawing has been done to surface using means other than cairo, and that cairo should reread any cached areas. Note that you must call [cairo.surface.Surface.flush] before doing such drawing.