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https://issues.apache.org/jira/browse/PDFBOX-5526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17618666#comment-17618666
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Andreas Lehmkühler commented on PDFBOX-5526:
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Any proposal is welcome especially if it reduces the consumption of resources
and/or speeds up long running processes.
Please keep it simple and don't add any code which isn't related to the topic
of your proposal and don't do any code formatting. See [coding
conventions|https://pdfbox.apache.org/codingconventions.html] for further
details
> 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
> Priority: Trivial
> Fix For: 2.0.28
>
>
> 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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