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https://issues.apache.org/jira/browse/PDFBOX-3900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16133354#comment-16133354
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ASF subversion and git services commented on PDFBOX-3900:
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Commit 1805452 from [~tilman] in branch 'pdfbox/branches/2.0'
[ https://svn.apache.org/r1805452 ]
PDFBOX-3900: optimize with lazy initialized map
> Optimize PDSeparation for shadings
> ----------------------------------
>
> Key: PDFBOX-3900
> URL: https://issues.apache.org/jira/browse/PDFBOX-3900
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.7
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Labels: optimization
> Fix For: 2.0.8, 3.0.0
>
>
> {{PDSeparation.toRGB()}} isn't optimized yet. It is easy to optimize because
> it is a single item color. However we can't use a float key like in image
> conversion (which is optimized) because the method is called by shading, so
> there may be an infinite number of keys and not just 256. Thus we'll multiply
> with 255, cast to int and use that as key. Due to the different intervals,
> the map can't be shared with the map from the two other conversions in the
> class. It isn't needed either because the PDSeparation objects are usually
> different, even if it is the same indirect object in the PDF.
> This optimization speeds up the rendering of [PDF.js issue
> 8500|https://github.com/mozilla/pdf.js/issues/8500], it renders in 66 seconds
> instead of 100. When rendering all my test files on my fast PC, overall time
> (excluding the mentioned file) gets lowered by 10 seconds, so we save up to
> 160 seconds somewhere.
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