[PDFBOX-2727] Cache color space instances

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: Rendering
• Assignee: John Hewson
• Reporter: Petr Slaby
• Created: 23/Mar/15 14:47
• Updated: 17/Mar/16 19:08
• Resolved: 09/Jul/15 10:11

Description

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.

Issue Links

• relates to: PDFBOX-2370 Move caching outside of PDResources