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https://issues.apache.org/jira/browse/PDFBOX-5258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17399310#comment-17399310
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ASF subversion and git services commented on PDFBOX-5258:
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Commit 1892347 from Tilman Hausherr in branch 'pdfbox/trunk'
[ https://svn.apache.org/r1892347 ]
PDFBOX-5258: revert accidental replace
> Lazier clipping
> ---------------
>
> Key: PDFBOX-5258
> URL: https://issues.apache.org/jira/browse/PDFBOX-5258
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.24, 3.0.0 PDFBox
> Reporter: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.25, 3.0.0 PDFBox
>
>
> From Stephan Schwiebert in linked PR:
> {quote}
> Calculating the intersection of two Area can take a lot of time. However,
> depending on the Graphics2D that is used for rendering, it may not be
> necessary to actually perform this operation.
> For instance, when generating an SVG, the individual clipping paths can be
> serialized individually, and the intersection is then calculated at runtime,
> when the SVG file is rendered.
> The idea of this PR is to replace PDGraphicsState.clippingPath with a list of
> GeneralPaths, which is lazily evaluated, truncated & cached when
> getCurrentClippingPath() is called (effectively leaving the current behaviour
> of PdfBox unchanged, and it should also not have any significant impact on
> the performance).
> Additionally, a new method protected void transferClip(PDGraphicsState
> graphicsState, Graphics2D graphics) is added to PageDrawer. By default, this
> method makes use of getCurrentClippingPath() to call graphics.setClip(...),
> which again is what PdfBox currently does.
> However, classes that extend PageDrawer can override this method, and
> directly access the individual clipping paths, without any need to calculate
> their intersection.
> In some cases (shading fills & transparency groups), it is still necessary to
> calculate the intersection.
> {quote}
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