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  1. Qt
  2. QTBUG-27472

QFontEngine object reference leak on QPainter::drawText

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Not Evaluated
    • Resolution: Duplicate
    • Affects Version/s: 4.7.4, 4.8.3
    • Fix Version/s: 4.8.x
    • Labels:
      None
    • Environment:
      Win7 Pro x32, Qt 4.7.4, MSVS2005

      Description

      I have the app which uses both MFC and Qt frameworks. I use QtWinMigrate library from qt-solutions. For some reasons I cann't have qApp instance during whole application lifetime. So in my app QApplication is dynamically created/destroyed when needed. I have found what drawText causes memory leaks in my app. I have made some investigation and found a cause for the biggest of them. Test example and patch attached. Note: Memory leaks still here. Patch fixes only one of all causes. In my tests (see example, 1000 cycles)
      1) when call of drawText is commented - app uses 8.9 MB of memory
      2) with call of drawText - after 1000 cycles the app uses 282 MB of memory
      3) with patch - after 1000 cycles the app uses 9.8MB of memory
      4) with patch 44c14470e5b28e45c19d6959b114e063cf3f4d83 - after 1000 cycles the app uses 282 MB of memory

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              Assignee:
              esabraha Eskil Abrahamsen Blomfeldt
              Reporter:
              nikolaynnov Andrey
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                Created:
                Updated:
                Resolved:

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