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https://issues.apache.org/jira/browse/PDFBOX-5443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17542105#comment-17542105
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Oliver Schmidtmer commented on PDFBOX-5443:
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The BBox is 0 0 3827 842 for all of the TranparencyGroups. I think the clip is
calculated from the path somewhere, or every transparency group would be that
slow. I think the first slow one is x6 or x7. But besides a bit different
coordinates x5 - x7 are the same and only one of them has no useful clipping
area.
Drawing the paths / filling is really fast. What causes this to be so slow is
rendering to an image layer first and then blending (a page sized image ) this
onto the page. Direct rendering to the page would be much faster over all. But
changing that could be complicated, if softmasks are involved.
> Clipping issues in TransparencyGroup
> ------------------------------------
>
> Key: PDFBOX-5443
> URL: https://issues.apache.org/jira/browse/PDFBOX-5443
> Project: PDFBox
> Issue Type: Bug
> Reporter: Oliver Schmidtmer
> Priority: Major
> Attachments: VarianteB - Demo.pdf, test-output-1.patch
>
>
> The attached PDFs renders slow due to clipping issues when rendering
> TransparencyGroups.
> There are many TransparencyGroups, which only draw on a small area defined in
> a path.
> Unfortunately, for some, even mostly identical TransparencyGroups, the
> clipping area is calculated to span the whole image. I've added a patchfile
> for some test output:
> {code:java}
> path bounds: java.awt.Rectangle[x=3185,y=22,width=34,height=71]
> drawing 0ms clip bounds: java.awt.Rectangle[x=0,y=-1,width=34,height=60]
> path bounds: java.awt.Rectangle[x=3082,y=45,width=105,height=48]
> drawing 127ms clip bounds: java.awt.Rectangle[x=0,y=0,width=3215,height=762]
> path bounds: java.awt.Rectangle[x=3082,y=-25,width=34,height=71]
> drawing 0ms clip bounds: java.awt.Rectangle[x=0,y=0,width=34,height=12]
> path bounds: java.awt.Rectangle[x=3185,y=92,width=155,height=71]
> drawing 0ms clip bounds: java.awt.Rectangle[x=0,y=0,width=87,height=71]
> path bounds: java.awt.Rectangle[x=3185,y=22,width=34,height=71]
> drawing 0ms clip bounds: java.awt.Rectangle[x=0,y=0,width=34,height=59]
> path bounds: java.awt.Rectangle[x=2155,y=793,width=29,height=11]
> drawing 0ms clip bounds: java.awt.Rectangle[x=0,y=0,width=29,height=3]
> path bounds: java.awt.Rectangle[x=2146,y=793,width=10,height=20]
> drawing 0ms clip bounds: java.awt.Rectangle[x=0,y=0,width=10,height=3]
> path bounds: java.awt.Rectangle[x=1809,y=659,width=3,height=7]
> path bounds: java.awt.Rectangle[x=1777,y=644,width=33,height=22]
> path bounds: java.awt.Rectangle[x=1686,y=602,width=93,height=43]
> path bounds: java.awt.Rectangle[x=1665,y=593,width=22,height=11]
> path bounds: java.awt.Rectangle[x=1665,y=580,width=7,height=14]
> path bounds: java.awt.Rectangle[x=1671,y=580,width=22,height=11]
> path bounds: java.awt.Rectangle[x=1692,y=589,width=33,height=16]
> path bounds: java.awt.Rectangle[x=1723,y=604,width=38,height=12]
> path bounds: java.awt.Rectangle[x=1757,y=614,width=4,height=7]
> path bounds: java.awt.Rectangle[x=1757,y=619,width=261,height=120]
> path bounds: java.awt.Rectangle[x=2017,y=737,width=86,height=40]
> path bounds: java.awt.Rectangle[x=2101,y=775,width=55,height=19]
> drawing 126ms clip bounds: java.awt.Rectangle[x=0,y=0,width=3215,height=762]
> path bounds: java.awt.Rectangle[x=2146,y=793,width=10,height=20]
> drawing 0ms clip bounds: java.awt.Rectangle[x=0,y=0,width=10,height=3]
> path bounds: java.awt.Rectangle[x=1811,y=659,width=336,height=154]
> drawing 3ms clip bounds: java.awt.Rectangle[x=0,y=0,width=336,height=137]
> path bounds: java.awt.Rectangle[x=388,y=356,width=893,height=2]
> path bounds: java.awt.Rectangle[x=1280,y=356,width=62,height=29]
> path bounds: java.awt.Rectangle[x=1326,y=383,width=16,height=3]
> path bounds: java.awt.Rectangle[x=1306,y=384,width=21,height=7]
> path bounds: java.awt.Rectangle[x=1135,y=389,width=172,height=12]
> path bounds: java.awt.Rectangle[x=1030,y=390,width=106,height=11]
> drawing 128ms clip bounds:
> java.awt.Rectangle[x=0,y=0,width=3215,height=762]{code}
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