Details
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Bug
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Resolution: Done
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P2: Important
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5.0.2
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None
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Archlinux x86_64 Qt 5.0.2
Ubuntu 12.04.2 x86_64 Qt 5.0.2
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9ad9615d0003c9fb84255152f0cbb473ee2a7a70
Description
Hi,
I have trouble drawing inside a Canvas if the renderStrategy is Canvas.Cooperative or Canvas.Threaded after/during a fast resize of the window. If the renderStrategy is Canvas.Immediate everything works as expected.
In the attached image QtPieSlice.png only pieslice1(blue) is correctly rendered, pieslice2(yellow) is not centred and sometimes parts of the rendering are missing. The computer which produces QtPieSlice.png has a Nvidia GPU.
On a different computer with an AMD GPU the output is completely broken see QtPieSplice2.png .
PieSlice.qml
import QtQuick 2.0 Canvas { antialiasing: true property string color: "green" property real angleSpan: Math.PI/6.0 onAngleSpanChanged: requestPaint() onPaint: { var w = width var h = height var a = angleSpan var ctx = getContext('2d'); ctx.save(); ctx.clearRect(0, 0, w, h); ctx.translate(w/2.0, h/2.0); ctx.fillStyle = color; ctx.beginPath(); ctx.moveTo(0, 0); ctx.arc(0, 0, Math.min(w, h)/2.0, - Math.PI/2.0 - a/2.0, - Math.PI/2.0 + a/2.0, false); ctx.closePath(); ctx.fill(); ctx.restore(); } }
main.qml
import QtQuick 2.0 Item { width:600 height:600 PieSlice { id: pieslice1 anchors.fill: parent renderStrategy: Canvas.Immediate color: "blue" opacity: 0.5 NumberAnimation on rotation { running: true loops: Animation.Infinite from: 0 to: 360 duration: 10000 } } PieSlice { id: pieslice2 anchors.fill: parent color: "yellow" opacity: 0.5 NumberAnimation on rotation { running: true loops: Animation.Infinite from: 0 to: 360 duration: 7000 } } }
Regards,
Bernd
