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https://issues.apache.org/jira/browse/PDFBOX-2117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14018668#comment-14018668
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Petr Slaby commented on PDFBOX-2117:
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{quote}
While the lookup table sounds like a good idea at first, I wonder what will
happen in a multithreading environment.
{quote}
That's a question I should have asked first, of course. Which parts of PDFBox
are supposed to be thread safe? From your comment I conclude that PD model is
expected to be used in multiple threads at the same time?
> AxialShadingContext is slow
> ---------------------------
>
> Key: PDFBOX-2117
> URL: https://issues.apache.org/jira/browse/PDFBOX-2117
> Project: PDFBox
> Issue Type: Improvement
> Reporter: Petr Slaby
> Attachments: AxialShading.patch, Shading2Function2text.pdf,
> asy-shade.pdf, color_gradient.pdf, shading_pattern.pdf
>
>
> AxialShadingContext#getRaster() is on top of profiler hot spots in documents
> that use an axial shading. Inside it, the slowest part is calling
> PDColorSpaceRGB#toRGB() and PDFunctionType3#eval() (in this order).
>
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