https://bugs.documentfoundation.org/show_bug.cgi?id=105003

            Bug ID: 105003
           Summary: Rotating a PNG image is quite slow
           Product: LibreOffice
           Version: 4.1.0.4 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: [email protected]
          Reporter: [email protected]

Description:
Rotating a PNG image is quite slow (and CPU intensive). Takes around 5 seconds.
Problems have intensified since LibO 4.2.0.4, because jpg images are converted
to png before rotating. 



Steps to Reproduce:
1.Open attached file
2.Right click the image: Rotate -> Rotate 180 degrees

Actual Results:  
Rotating takes around 5 seconds

Expected Results:
Rotating should be instantaneous



Reproducible: Always

User Profile Reset: No

Additional Info:
Version: 5.4.0.0.alpha0+
Build ID: d0288a482a3dc0f50f535565e4c66a95bb140942
CPU Threads: 4; OS Version: Windows 6.19; UI Render: default; 
TinderBox: Win-x86@42, Branch:master, Time: 2016-12-26_23:25:18
Locale: nl-NL (nl_NL); Calc: CL

and in
Versie: 4.1.0.4 
Build ID: 89ea49ddacd9aa532507cbf852f2bb22b1ace28


User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:45.0) Gecko/20100101
Firefox/45.0

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