Bug#850705: libqt5gui5: enabling software rendering in 90qt5-opengl
Package: libqt5gui5
Version: 5.7.1+dfsg-2
90qt5-opengl was introduced to enable software rendering in Qt Quick apps
when hardware OpenGL is not available
(https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=811195).
It sets QT_XCB_FORCE_SOFTWARE_OPENGL=1to force Mesa to use software
rendering.
But since Qt 5.7 there is a better way: qtdeclarative-render2d plugin.
It is much faster than the sofware rendering provided by Mesa.
So please, package qtdeclarative-render2d-opensource-src and set
QMLSCENE_DEVICE=softwarecontext when the plugin is available.
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