Surface.markDirtyRectangle
void markDirtyRectangle(int x, int y, int width, int height)Like [cairo.surface.Surface.markDirty], but drawing has been done only to the specified rectangle, so that cairo can retain cached contents for other parts of the surface.
Any cached clip set on the surface will be reset by this function, to make sure that future cairo calls have the clip set that they expect.
Parameters
x | X coordinate of dirty rectangle |
y | Y coordinate of dirty rectangle |
width | width of dirty rectangle |
height | height of dirty rectangle |