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https://issues.apache.org/jira/browse/PDFBOX-2117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14018700#comment-14018700
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Petr Slaby commented on PDFBOX-2117:
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Oh, I missed the point. The color space classes are singletons. I will
synchronize the lookup table access then. Better still would be to find a
faster ICC profile color space implementation. It does a lot of float precision
math, but in the end the RGB values are most usually converted to 8-bit.
Rounding the input values in toRGB() to that precision would significantly
improve the lookup table hit rate, but is probably not a right thing to do.
> 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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