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Posted to dev@pdfbox.apache.org by "John Hewson (JIRA)" <ji...@apache.org> on 2015/03/24 19:52:55 UTC
[jira] [Comment Edited] (PDFBOX-2727) Cache color space instances
[ https://issues.apache.org/jira/browse/PDFBOX-2727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14378365#comment-14378365 ]
John Hewson edited comment on PDFBOX-2727 at 3/24/15 6:52 PM:
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PDResources isn't the right place to do caching, it needs to be further downstream. It was explicitly removed in PDFBOX-2370 and I have a patch in-progress to replace it. I've noticed that caching of color spaces is really the only thing which has a significant impact on performance, so we might want to start by just caching those, however PDResources isn't the place to do it.
was (Author: jahewson):
PDResources isn't the right place to do caching, it needs to be further downstream. It was explicitly removed in PDFBOX-2370 and I have a patch in-progress to replace it. I've noticed that caching of color spaces is really the only think which has a significant impact on performance, so we might want to start by just caching those, however PDResources isn't the place to do it.
> Cache color space instances
> ---------------------------
>
> Key: PDFBOX-2727
> URL: https://issues.apache.org/jira/browse/PDFBOX-2727
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.0
> Reporter: Petr Slaby
> Priority: Minor
> Attachments: 000435.pdf, PDResources.java.patch
>
>
> I have a PDF from a customer which contains a lot of calls of SetNonStrokingColorSpace and SetStrokingColorSpace. Each time, an embedded color profile resource is loaded via ICC_Profile.getInstance(InputStream). I have attempted to cache the result in PDResources.java as shown in the attached patch. For this particular PDF, this change improves the performance of PDFToImage from 27 seconds down to 5 seconds (the PDF has two pages). I cannot share the customer PDF, so I have attempted to find a similar free one. Unfortunately, in my test suite, I did not find anything with a comparable improvement. The best example I found is in the attached PDF. There the improvement is from 4.9 seconds without caching to 4.1 with caching.
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