[cairo] cairo_font.c patch

[David Reveman]

On Thu, 2004-05-27 at 18:44 +0200, Maarten Breddels wrote:
> There is a bug in cairo_font.c:_cairo_glyph_surface_init.
> (Or cairo_image_surface.c:_cairo_image_surface_set_image has to be
> implemented)
> 
> When the surface->backend != image->backend, but the surface is using
> the image backend as 'similars', glyph images aren't copied to the
> glyph->surface since the _cairo_image_surface_set_image function isn't
> implemented. This patch does an extra check on the similar surface
> backend, to avoid the _cairo_surface_set_image.
> Maybe there is a better way to detect if the backend uses image surfaces
> as similars, because now, a surface is created and destroyed for each
> glyph created.

This patch should do it, no unessisary surfaces created this way.
 
-David
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