[jira] [Assigned] (PDFBOX-2727) Cache color space instances

["John Hewson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-2727?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

John Hewson reassigned PDFBOX-2727:
-----------------------------------

    Assignee: John Hewson

> 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
>            Assignee: John Hewson
>            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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