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Better approximate gradient color stops

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PDF gradients do not have color stops but an arbitrary PDF function of
the type f(t) -> color. CSS gradients are only based on color stops.
Most PDF gradient functions are produced from color stop oriented
gradients.

Take advantage of this by sampling the PDF function at a higher
frequency but not converting any samples which could be interpolated to
color stops. The sampling frequency is chosen to be the least common
multiple of as many values as practical to exactly re-create the common
case of the PDF function implementing equally spaced linearly
interpolated stops in RGB color space. This also allows for better
approximation of other smooth PDF functions (non-linear, or non-equally
spaced, or in different color space).

Fixes: #10572, #14165
This commit is contained in:
Ben Wagner 2023-03-03 11:41:04 -05:00
parent a0ef5a4ae1
commit 5fad91a680
5 changed files with 797 additions and 7 deletions
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2
test/pdfs/.gitignore vendored
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@ -341,6 +341,7 @@
!issue12810.pdf
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!issue12010_reduced.pdf
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!issue11718_reduced.pdf
!bug1027533.pdf
!bug1028735.pdf
@ -529,6 +530,7 @@
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!issue15150.pdf
!poppler-395-0-fuzzed.pdf
!issue14165.pdf
!GHOSTSCRIPT-698804-1-fuzzed.pdf
!issue14814.pdf
!poppler-91414-0-53.pdf

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test/pdfs/issue14165.pdf Normal file
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12
test/test_manifest.json
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@ -5376,6 +5376,12 @@
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