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https://issues.apache.org/jira/browse/PDFBOX-2117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14082093#comment-14082093
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Shaola Ren commented on PDFBOX-2117:
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Thanks for all those discussion, I reread the document and code, inputValue is
not t, its range is always 0 to 1, we should keep the simple inputValue *
length form, the very first version. Sorry about my last two comments,
everything is clear now, a misunderstand of inputValue before.
> AxialShadingContext is slow
> ---------------------------
>
> Key: PDFBOX-2117
> URL: https://issues.apache.org/jira/browse/PDFBOX-2117
> Project: PDFBox
> Issue Type: Sub-task
> Components: Rendering
> Affects Versions: 1.8.6, 1.8.7, 2.0.0
> Reporter: Petr Slaby
> Assignee: Shaola Ren
> Labels: shading, shadingpattern
> Fix For: 2.0.0
>
> 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, PDFBOX-2117-068519-ShadingType3.pdf,
> PDFBOX-2117-068519.pdf, PDFBOX-2117-068519.pdf-2-bad.png,
> PDFBOX-2117-068519.pdf-2-good.png, Shading2Function2.pdf,
> Shading2Function2.ps, Shading2Function2domain3.pdf,
> Shading2Function2text.pdf, asy-shade.pdf,
> bad_pdfbox-2117-068519-shadingtype3.pdf-1.png, color_gradient.pdf,
> good_pdfbox-2117-068519-shadingtype3.pdf-1.png, 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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