[Interest] Drawing slow.

Bill Crocker william.crocker at analog.com
Fri Aug 17 20:36:16 CEST 2018


Hello:

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.

Thanks.

Bill



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