Hi, Il 17/08/2018 20:36, Bill Crocker ha scritto:
My newer, Qt based drawing program takes orders of magnitude longer to draw lines than my good old plain X-Windows based drawing program.The Qt call stack, as revealed by VTune, is: QPainterPath::draw QPaintEngineEx::draw QRasterPaintEngine::stroke QPaintEngineEx::stroke QRasterPaintEngine::fill QRasterizer::rasterize QScanConverter::end Am I using some fancy, expensive feature that I should turn off.
How are you measuring the time / framerate / CPU usage for the XWindows-based one? Note that when using X11 some rendering may happen "server side", therefore it's not accounted for in your application's CPU time.
It would also be great if you had testcases. HTH, -- Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Senior Software Engineer KDAB (France) S.A.S., a KDAB Group company Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com KDAB - The Qt, C++ and OpenGL Experts
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