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Posted to dev@pdfbox.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2018/03/24 13:00:00 UTC
[jira] [Commented] (PDFBOX-4156) Possible optimization of
SampledImageReader.from8bit by using InterleavedRaster
[ https://issues.apache.org/jira/browse/PDFBOX-4156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16412598#comment-16412598 ]
ASF subversion and git services commented on PDFBOX-4156:
---------------------------------------------------------
Commit 1827646 from [~tilman] in branch 'pdfbox/branches/2.0'
[ https://svn.apache.org/r1827646 ]
PDFBOX-4156: optimize reading of 8 bit images by using InterleavedRaster instead of BandedRaster, by Itai Shaked
> 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
> 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 Perhaps the constraint is obsolete, or else it means custom sample models cannot be used?
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