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https://issues.apache.org/jira/browse/PDFBOX-2117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14062218#comment-14062218
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Tilman Hausherr commented on PDFBOX-2117:
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I had to make slight changes in four files, see the diff in PDFBOX-2209.
Btw can you also make a similar optimization you did for axial shading for
radial shading? I.e. store values along the two radii in tables. The second
page of PDFBOX-1764 is a good test.
> AxialShadingContext is slow
> ---------------------------
>
> Key: PDFBOX-2117
> URL: https://issues.apache.org/jira/browse/PDFBOX-2117
> Project: PDFBox
> Issue Type: Sub-task
> Components: Rendering
> Reporter: Petr Slaby
> Attachments: 000001_MTEXT_CS6.pdf, AxialShading.patch,
> AxialShading1.patch, AxialShadingContext.java.getrgbimage,
> GWG061_Shading_x1a.pdf, GWG061_Shading_x1a.pdf-1.png,
> GWG061_Shading_x1a.pdf-1.png-diff.png, Shading2Function2.pdf,
> Shading2Function2.ps, 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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