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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (Jira)" <ji...@apache.org> on 2022/11/02 07:05:00 UTC
[jira] [Commented] (PDFBOX-5526) Apply subsampling and region to masks
[ https://issues.apache.org/jira/browse/PDFBOX-5526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17627492#comment-17627492 ]
Tilman Hausherr commented on PDFBOX-5526:
-----------------------------------------
Do you have a file that shows the effect and can you share it? I likely have one, but I would have to write some code to find it.
> Apply subsampling and region to masks
> -------------------------------------
>
> Key: PDFBOX-5526
> URL: https://issues.apache.org/jira/browse/PDFBOX-5526
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.26
> Reporter: Velislava Yanchina
> Assignee: Andreas Lehmkühler
> Priority: Trivial
> Fix For: 2.0.28, 3.0.0 PDFBox
>
>
> When {{{}{}}}`PDImageXObject.{{{}getImage()`{}}} gets invoked with subsampling and region, internally it loads the entire mask into memory: [https://github.com/apache/pdfbox/blob/961c052d52dd9ab2dd3d7cd762a5046e5cc85a91/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/image/PDImageXObject.java#L465]
> and applies the entire mask on the subsampled image.
> Which is extra work and can cause `OOM` exceptions.
> The proposed optimisation is to pass `region` and `subsampling` params to `PDImageXObject.getOpaqueImage() `here - [https://github.com/apache/pdfbox/blob/961c052d52dd9ab2dd3d7cd762a5046e5cc85a91/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/image/PDImageXObject.java#L548]
> such that masks are also subsampled before applying them...
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