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https://issues.apache.org/jira/browse/PDFBOX-5134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17303733#comment-17303733
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Oliver Schmidtmer commented on PDFBOX-5134:
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That is correct, the slow painting is Java itself. However, the clipping area
is null and the paint applied to the whole image while those shades are
PDTriangleBasedShadingTypes which only cover a very small area.
For example with the device bounds [x=0,y=0,width=4031,height=2024] a bounding
rectangle, calculated in GouraudShadingContext.setTriangleList, around the
triangles for shading COSName\{Sh0} is only
[x=2916.300048828125,y=897.4940185546875,w=16.97998046875,h=17.0400390625]
Applying a Paint to such a small area should be much faster. I probably need
more time to look into how to calculate that beforehand and setting the
clipping area.
> Very slow rendering on PageDrawer.shadingFill
> ---------------------------------------------
>
> Key: PDFBOX-5134
> URL: https://issues.apache.org/jira/browse/PDFBOX-5134
> Project: PDFBox
> Issue Type: Bug
> Reporter: Oliver Schmidtmer
> Priority: Major
> Labels: shading
> Attachments: Plan zum Testen.pdf, image-2021-03-17-20-16-49-221.png
>
>
> The PDF contains many effectively very small shadings, the light cones. As
> the gradient painting for each light cone is applied on the whole image,
> rendering is very slow: 29 of 33 seconds are spent in shadingFill.
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