Velislava Yanchina created PDFBOX-5526:
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Summary: 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
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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