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References: https://bugs.freedesktop.org/show_bug.cgi?id=48577
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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The earliest use of the clip path's polygon fill rule is now for
intersecting the original polygon with the plurality of clip boxes.
However, the initialisation of the fill rule remained after the
intersection.
==8968== Conditional jump or move depends on uninitialised value(s)
==8968== at 0x4C99449: _cairo_polygon_intersect (cairo-polygon-intersect.c:1382)
==8968== by 0x4C9B788: _cairo_polygon_intersect_with_boxes.part.12 (cairo-polygon-intersect.c:1520)
==8968== by 0x4C6AE6E: _cairo_clip_get_polygon (cairo-clip-polygon.c:104)
==8968== by 0x4CAA667: clip_and_composite_boxes.part.13 (cairo-spans-compositor.c:773)
==8968== by 0x4CAAD1D: clip_and_composite_boxes (cairo-spans-compositor.c:758)
==8968== by 0x4CAB25C: _cairo_spans_compositor_fill (cairo-spans-compositor.c:1023)
==8968== by 0x4C6CB69: _cairo_compositor_fill (cairo-compositor.c:184)
==8968== by 0x4C7CE3E: _cairo_image_surface_fill (cairo-image-surface.c:945)
==8968== by 0x4CAE2B6: _cairo_surface_fill (cairo-surface.c:2047)
==8968== by 0x4C74AB7: _cairo_gstate_fill (cairo-gstate.c:1268)
==8968== by 0x4C6E6D3: _cairo_default_context_fill (cairo-default-context.c:1009)
==8968== by 0x4C67944: cairo_fill (cairo.c:2105)
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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If we have more than a single box, run the boxes intersection as a
post-processing step on the clip polygon, as it should be faster than
doing it inline.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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A clip with only a single path or can be reduced to a single polygon are
easier to handle than a clip containing a mixture of paths (typically
ANTIALIAS_NONE vs ANTIALIAS_DEFAULT).
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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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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