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We merge _cairo_surface_create_similar_scratch and
_cairo_surface_create_similar_solid into a single function named
_cairo_surface_create_scratch, to avoid confusion with
cairo_surface_create_similar which now will have a different
behaviour wrt the sizes and the device-scale.
_create_scratch assumes the width and height are in backend
coordinates, while create_similar does not.
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As we convert the unaligned clip boxes to a region, we need to process
the intersection of the boxes with the clip surface as a separate step.
Fixes tighten-box for the base compositor.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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If one of the _cairo_surface_fill() calls failed, this function would stop and
return an intermediate result, thus hiding the error that happened.
Signed-off-by: Uli Schlachter <psychon@znc.in>
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Having spent the last dev cycle looking at how we could specialize the
compositors for various backends, we once again look for the
commonalities in order to reduce the duplication. In part this is
motivated by the idea that spans is a good interface for both the
existent GL backend and pixman, and so they deserve a dedicated
compositor. xcb/xlib target an identical rendering system and so they
should be using the same compositor, and it should be possible to run
that same compositor locally against pixman to generate reference tests.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
P.S. This brings massive upheaval (read breakage) I've tried delaying in
order to fix as many things as possible but now this one patch does far,
far, far too much. Apologies in advance for breaking your favourite
backend, but trust me in that the end result will be much better. :)
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Step 1, fix the failings sighted recently by tracking clip-boxes as an
explicit property of the clipping and of composition.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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