[QGIS-Developer] debug build - DPI assertion fails in qgsmaprenderercustompainterjob.cpp

[Alessandro Pasotti]

What about rounding and comparing integers?

On Thu, Dec 20, 2018 at 2:38 PM Jonas <qgis at ag99.de> wrote:

> Hi,
>
> leaving this here, because it happens just in Debug builds:
>
> the assertion in qgsmaprenderercustompainterjob.cpp/line 73 fails on my
> non-retina Mac Book Air when i change the magnification by locking the
> scale and using the trackpad to zoom. changing magnification via the
> spinner-box is just fine.
>
> the assertion check is only enabled in debug builds ( #ifndef QT_NO_DEBUG
> ) so i didn’t want to file a bug report, just FYI.
>
> log output is:
> src/gui/qgsmapcanvas.cpp: 1588: (wheelEvent) [3ms] Wheel event delta 2
> src/core/qgsmapsettings.cpp: 63: (setMagnificationFactor) [0ms]
> Magnification factor: 1.52486 dpi: 109.79 ratio: 0.983607
> src/gui/qgsmapcanvas.cpp: 514: (refresh) [0ms] CANVAS refresh scheduling
> src/gui/qgsmapcanvas.cpp: 732: (stopRendering) [11ms] CANVAS stop
> rendering!
> src/core/qgsmaprendererparalleljob.cpp: 115: (cancelWithoutBlocking) [0ms]
> PARALLEL cancel at status 1
> src/core/qgsvectorlayerrenderer.cpp: 270: (drawRenderer) [0ms]
> [thread:0x7fe3ab038820] Drawing of vector layer
> Ortsteile_Berlin_3808bce3_0433_4bd1_ab94_24c1a4c2b617 canceled.
> src/core/qgsmaprendererparalleljob.cpp: 64: (start) [2ms] QThreadPool max
> thread count is 4
> src/core/qgsmaprendererparalleljob.cpp: 222: (renderingFinished) [0ms]
> PARALLEL finished
> src/gui/qgsmapcanvas.cpp: 1588: (wheelEvent) [18ms] Wheel event delta 2
> src/core/qgsmapsettings.cpp: 63: (setMagnificationFactor) [0ms]
> Magnification factor: 1.55027 dpi: 111.62 ratio: 0.983607
> src/gui/qgsmapcanvas.cpp: 514: (refresh) [0ms] CANVAS refresh scheduling
> src/gui/qgsmapcanvas.cpp: 732: (stopRendering) [2ms] CANVAS stop rendering!
> src/core/qgsmaprendererparalleljob.cpp: 115: (cancelWithoutBlocking) [0ms]
> PARALLEL cancel at status 1
> src/core/qgsvectorlayerrenderer.cpp: 270: (drawRenderer) [0ms]
> [thread:0x7fe3ab22a850] Drawing of vector layer
> Ortsteile_Berlin_3808bce3_0433_4bd1_ab94_24c1a4c2b617 canceled.
> src/core/qgsmaprendererparalleljob.cpp: 64: (start) [3ms] QThreadPool max
> thread count is 4
> src/core/qgsmaprendererparalleljob.cpp: 222: (renderingFinished) [0ms]
> PARALLEL finished
> src/core/qgsmaprendererparalleljob.cpp: 201: (renderLayersFinished) [67ms]
> PARALLEL layers finished
> src/core/qgsmaprenderercustompainterjob.cpp: 345: (drawLabeling) [1ms]
> [thread:0x7fe3ab263850] Draw labeling took (seconds): 0
> src/core/qgsmaprendererparalleljob.cpp: 222: (renderingFinished) [2ms]
> PARALLEL finished
> src/core/qgsmaprendererjob.cpp: 439: (cleanupLabelJob) [0ms] caching label
> result image
> src/gui/qgsmapcanvas.cpp: 600: (rendererJobFinished) [0ms] CANVAS finish! 1
> src/gui/qgsmapcanvas.cpp: 1588: (wheelEvent) [30ms] Wheel event delta 2
> src/gui/qgsmapcanvas.cpp: 1588: (wheelEvent) [8ms] Wheel event delta 0
> src/gui/qgsmapcanvas.cpp: 1588: (wheelEvent) [0ms] Wheel event delta 0
> Fatal: ASSERT failure in Job::startRender(): "pre-set DPI not equal to
> painter's DPI (112 vs 111.62)", file
> src/core/qgsmaprenderercustompainterjob.cpp, line 73
> 14:24:25: The program has unexpectedly finished.
>
>
> thanks
> Jonas
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-- 
Alessandro Pasotti
w3:   www.itopen.it
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