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https://issues.apache.org/jira/browse/PDFBOX-5134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17313647#comment-17313647
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ASF subversion and git services commented on PDFBOX-5134:
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Commit 1888289 from Tilman Hausherr in branch 'pdfbox/trunk'
[ https://svn.apache.org/r1888289 ]
PDFBOX-5134: calculating the bounding boxes of the triangles reduces shading
rendering times if no bounding box is preset, as suggested by Oliver
Schmidtmer; Closes #109
> Very slow rendering on PageDrawer.shadingFill
> ---------------------------------------------
>
> Key: PDFBOX-5134
> URL: https://issues.apache.org/jira/browse/PDFBOX-5134
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.22, 2.0.23
> Reporter: Oliver Schmidtmer
> Priority: Major
> Labels: optimization, shading
> Fix For: 2.0.24, 3.0.0 PDFBox
>
> Attachments: PDFBOX-4217-shade_via_1.3_006.pdf,
> PDFBOX-4217-shade_via_1.3_006.pdf-1.png,
> PDFBOX-4217-shade_via_1.3_006.pdf-1.png-diff.png, Plan zum Testen.pdf,
> gs-bugzilla687307-2.pdf, gs-bugzilla687307-2.pdf-1.png,
> gs-bugzilla687307-2.pdf-1.png-diff.png, 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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