[cairo] Pixman performace

Chris Wilson chris at chris-wilson.co.uk
Fri Oct 18 14:28:25 CEST 2013

On Fri, Oct 18, 2013 at 11:40:33AM +0200, Carlos López González wrote:
>    Hi!
>    I would like to know if when rendering to image surface there is
>    noticeable performance increment when changing from default

In theory, for equivalent output, no. That is the optimisations we make
at the pixman level are based on the geometry, so if the rendering was
already pixel-aligned with CAIRO_ANTIALIAS_DEFAULT then you should hit
exactly the same paths as CAIRO_ANTIALIAS_NONE. Where ANTIALIAS_NONE can
have a big impact is in the generation of geometry, either using a
faster scanline rasteriser or in simplifying the input geometry to
bypass rasterisation altogether.

Chris Wilson, Intel Open Source Technology Centre

More information about the cairo mailing list