[cairo] Problem with png in pdf documents when using acroread

[Davide Viti]

On Wed, Apr 04, 2007 at 05:55:48PM -0400, Behdad Esfahbod wrote:
> This is because you are setting source with cairo_set_source_surface()
> and do not reset it to black by the time of cairo_stroke() in the second
> run of the loop.

that's right and it fixes the problem without the need of using cairo_{save,restore}

Thank you,
Davide
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