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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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If the filter mode is anything other than DEFAILT, FAST or NEAREST set the
Interpolate flag in the image dictionary so that a smoothing filter is
applied when rasterising the vector file.
As we have no control over the implementation of the Interpolate filter
(the PS/PDF specifications leave it undefined) we need to capture the
output of poppler/GS and update our reference images. (For a couple of
tests, the filtering is irrelevant so for those we set the filter to
NEAREST.)
Note that GhostScript's Interpolate filter does not work on rotated images
(and a variety of other transformations) so several of the PS reference
images have use nearest-neighbour sampling instead of a bilinear filter.
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Ensure that we can generate PS2 output when required by creating a PS
level 2 target and using GhostScript for conformance testing.
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![[test] Use '.' as the field separator in the names](/~bryce/cairo/commit/test/extend-reflect-ps3-ref.png?id=992f74d884c9ea83f7b51c6959dd93718027b99a){kind=link}
![[boilerplate] Add a PS 2 target.](/~bryce/cairo/commit/test/extend-reflect-ps3-ref.png?id=e0f214710760a0e0332207cb3009e3119867bd13){kind=link}