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https://issues.apache.org/jira/browse/PDFBOX-4156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr resolved PDFBOX-4156.
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Resolution: Fixed
Assignee: Tilman Hausherr
Thank you [~itai]!
> Possible optimization of SampledImageReader.from8bit by using
> InterleavedRaster
> -------------------------------------------------------------------------------
>
> Key: PDFBOX-4156
> URL: https://issues.apache.org/jira/browse/PDFBOX-4156
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.8
> Reporter: Itai Shaked
> Assignee: Tilman Hausherr
> Priority: Minor
> Labels: optimization
> Fix For: 2.0.10, 3.0.0 PDFBox
>
> Attachments: interleaved_raster.patch
>
>
> I noticed {{SampledImageReader.from8Bit}} assumed the source data to be
> interleaved, which means if the target raster uses an interleaved sample
> model, the data can by directly copied.
> This can save 10-15% of total render time in files with large 8-bit images
> (tested on samples from PDFBOX-2092 , PDFBOX-3791 and the file
> "gs-bugzilla690022.pdf" from PDFBOX-4151).
> In PDFBOX-2092 there is a discussion about how the sample model must be
> Banded, but I couldn't find a place in the code that directly relies on this,
> and the few tests I have run did not reveal problems. Perhaps the constraint
> is obsolete, or else it means custom sample models cannot be used?
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