[cairo] Patch improving fallbacks

[Carl Worth]

On Mon, 31 Jan 2005 12:09:10 -0500, Carl Worth wrote:
> 	cairo_set_target_surface (cr, surface);
> 	cairo_surface_mark_dirty (cr, surface, 0, 0, width, height);

Oh, but several backends won't have any notion of this operation.

So, perhaps what we actually want is cairo_xlib_surface_mark_dirty,
cairo_quartz_surface_mark_dirty.

Then, those functions could accept the appropriate region object for
the given window system.

-Carl
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