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Posted to dev@pdfbox.apache.org by "Petr Slaby (JIRA)" <ji...@apache.org> on 2015/03/23 15:48:10 UTC

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

Petr Slaby created PDFBOX-2727:
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             Summary: 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


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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