[QGIS-trac] [Quantum GIS] #1089: Crash when zooming in on rendered composer map

[Quantum GIS]

#1089: Crash when zooming in on rendered composer map
---------------------------------------------------------+------------------
   Reporter:  StevenB                                    |              Owner:  nobody
       Type:  bug                                        |             Status:  new   
   Priority:  critical: causes crash or data corruption  |          Milestone:        
  Component:  Printing                                   |            Version:  HEAD  
   Keywords:  composer render clip zoom                  |   Platform_version:        
   Platform:  Debian                                     |           Must_fix:  No    
Status_info:  0                                          |  
---------------------------------------------------------+------------------
 Qgis crashes when I zoom in on a composer map in render mode.  To
 reproduce the problem:
 {{{
 -Open a new project
 -Add a vector layer
 -Open the print composer
 -Add a map to the canvas
 -Set the map to render mode
 -Zoom in
 }}}
 I was able to reproduce the bug with multiple vector datasets, including
 archsites.shp.

 The bug was introduced in r8440.

 I got different backtraces when using different layers; there might
 actually be more than one bug involved.
 {{{
 #0  0xb765a3d1 in QPainter::isActive () from /usr/lib/libQtGui.so.4
 #1  0xb765fca5 in QPainter::save () from /usr/lib/libQtGui.so.4
 #2  0xb7663d1c in ?? () from /usr/lib/libQtGui.so.4
 #3  0xb766624c in QPainter::drawRects () from /usr/lib/libQtGui.so.4
 #4  0xb7666795 in QPainter::drawImage () from /usr/lib/libQtGui.so.4
 #5  0xb7163cab in QPainter::drawImage ()
    from /usr/local/lib/libqgis_core.so.0.11
 #6  0xb715f04b in QgsVectorLayer::drawFeature ()
    from /usr/local/lib/libqgis_core.so.0.11
 #7  0xb715f8b2 in QgsVectorLayer::draw ()
    from /usr/local/lib/libqgis_core.so.0.11
 #8  0xb712875d in QgsMapRender::render ()
    from /usr/local/lib/libqgis_core.so.0.11
 #9  0x08228c99 in QgsComposerMap::draw ()
 #10 0x08229456 in QgsComposerMap::paint ()
 #11 0xb7aeb021 in ?? () from /usr/lib/libQtGui.so.4
 #12 0xb7aee55e in ?? () from /usr/lib/libQtGui.so.4
 #13 0xb7aeffc3 in QGraphicsScene::drawItems () from /usr/lib/libQtGui.so.4
 #14 0xb7b022ac in QGraphicsView::drawItems () from /usr/lib/libQtGui.so.4
 ...
 }}}

 On some occasions, I got several warning messages before the program
 crashed:

 Warning: QPainter::begin: A paint device can only be painted by one
 painter at a time.
 Warning: QPaintEngine::setSystemClip: Should not be changed while engine
 is active
 Warning: QPaintEngine::setSystemClip: Should not be changed while engine
 is active
 Warning: QPainter::clipPath: Painter not active

 {{{
 #0  0xb76320dc in QPainter::worldMatrixEnabled () from
 /usr/lib/libQtGui.so.4
 #1  0xb758df04 in QWidgetPrivate::paintSiblingsRecursive ()
    from /usr/lib/libQtGui.so.4
 #2  0xb758d406 in QWidgetPrivate::drawWidget () from
 /usr/lib/libQtGui.so.4
 #3  0xb76eee9d in ?? () from /usr/lib/libQtGui.so.4
 #4  0xb76ef627 in ?? () from /usr/lib/libQtGui.so.4
 #5  0xb759318f in QWidget::event () from /usr/lib/libQtGui.so.4
 #6  0xb78e57e5 in QMainWindow::event () from /usr/lib/libQtGui.so.4
 #7  0xb753bc0c in QApplicationPrivate::notify_helper ()
    from /usr/lib/libQtGui.so.4
 #8  0xb7540898 in QApplication::notify () from /usr/lib/libQtGui.so.4
 #9  0xb7e6b6a9 in QCoreApplication::notifyInternal ()
    from /usr/lib/libQtCore.so.4
 #10 0xb75bec91 in QWidgetPrivate::dirtyWidget_sys ()
    from /usr/lib/libQtGui.so.4
 #11 0xb76ed6b0 in ?? () from /usr/lib/libQtGui.so.4
 #12 0xb76ef399 in QWidget::repaint () from /usr/lib/libQtGui.so.4
 #13 0xb7589548 in QWidget::repaint () from /usr/lib/libQtGui.so.4
 #14 0xb787b7bd in ?? () from /usr/lib/libQtGui.so.4
 #15 0xb787ba3b in QAbstractButton::mouseReleaseEvent ()
    from /usr/lib/libQtGui.so.4
 #16 0xb7954bdc in QToolButton::mouseReleaseEvent () from
 /usr/lib/libQtGui.so.4
 #17 0xb75934a4 in QWidget::event () from /usr/lib/libQtGui.so.4
 #18 0xb787aaff in QAbstractButton::event () from /usr/lib/libQtGui.so.4
 #19 0xb79544b4 in QToolButton::event () from /usr/lib/libQtGui.so.4
 #20 0xb753bc0c in QApplicationPrivate::notify_helper ()
    from /usr/lib/libQtGui.so.4
 #21 0xb7540cd5 in QApplication::notify () from /usr/lib/libQtGui.so.4
 #22 0xb7e6b6a9 in QCoreApplication::notifyInternal ()
    from /usr/lib/libQtCore.so.4
 #23 0xb753de21 in QApplicationPrivate::sendMouseEvent ()
    from /usr/lib/libQtGui.so.4
 #24 0xb75a7ccd in ?? () from /usr/lib/libQtGui.so.4
 #25 0xb75a66b1 in QApplication::x11ProcessEvent () from
 /usr/lib/libQtGui.so.4
 #26 0xb75cf3ba in ?? () from /usr/lib/libQtGui.so.4
 #27 0xb6184bf8 in g_main_context_dispatch () from
 /usr/lib/libglib-2.0.so.0
 #28 0xb6187e5e in ?? () from /usr/lib/libglib-2.0.so.0
 #29 0x08332090 in ?? ()
 #30 0x00000000 in ?? ()
 }}}

-- 
Ticket URL: <http://trac.osgeo.org/qgis/ticket/1089>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats