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We refactor the surface fallbacks to convert full strokes and fills to the
intermediate polygon representation (as opposed to before where we
returned the trapezoidal representation). This allow greater flexibility
to choose how then to rasterize the polygon. Where possible we use the
local spans rasteriser for its increased performance, but still have the
option to use the tessellator instead (for example, with the current
Render protocol which does not yet have a polygon image).
In order to accommodate this, the spans interface is tweaked to accept
whole polygons instead of a path and the tessellator is tweaked for speed.
Performance Impact
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Still measuring, expecting some severe regressions.
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The nature of the joins depends critically upon whether the joint is
clockwise or counter-clockwise, so extend the basic caps-joins test to
exercise both conditions i.e. repeat the test under a reflection.
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We frequently use '-' within the test name or format name and so we
encounter confusion as '-' is also used as the field separator. At times
this has caused a new test to break an old test because the new test would
match one of the old test's target specific reference images. So switch
everything over to use '.' between fields (test name, target, format,
subtest, etc.).
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![[test] Exercise caps and joins under reflection.](/~podain/cairo/commit/test/dash-curve.ref.png?id=f0804d4856496a46d0b2270d5815856bf63b4cf8){kind=link}
![[test] Use '.' as the field separator in the names](/~podain/cairo/commit/test/dash-curve.ref.png?id=992f74d884c9ea83f7b51c6959dd93718027b99a){kind=link}