QColor stores RGB colour with 16 bits per channel, so "0.5" would convert to 32768 (i.e. round(0.5 * 65535)), or 0x8000.
If you convert down to 8 bits per channel, you'll have 0x80. If you convert that value back up to 16 bits per channel, you'll have 0x8080. And finally, converting that to floating point gives you 0.50196. So you'll probably need to adjust the tests to accept an error on the order of 1/(2*255) in these values. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to qtdeclarative-opensource- src in Ubuntu. https://bugs.launchpad.net/bugs/1619281 Title: Text.color can't be compared reliably Status in qtdeclarative-opensource-src package in Ubuntu: Confirmed Bug description: Given the below QML: import QtQuick 2.4 Text { id: text text: 'foobar' color: foobar property color foobar: Qt.rgba(0, 0, 0, 0.5) property color foobar2: foobar Component.onCompleted: { console.log("text:", text.color, foobar, Qt.colorEqual(text.color, foobar), text.color.a); console.log("property:", foobar2, foobar, Qt.colorEqual(foobar2, foobar), foobar2.a); /* qml: text: #80000000 #80000000 false 0.5019607843137255 qml: property: #80000000 #80000000 true 0.5000076295109483 */ } } Seems that Text.color stores the colour with a different precision, resulting in Qt.colorEqual() returning false. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: libqt5quick5 5.6.1-4ubuntu3~xenialoverlay1~1 [origin: LP-PPA-ci-train-ppa-service-stable-phone-overlay] ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16 Uname: Linux 4.4.0-36-generic x86_64 NonfreeKernelModules: zfs zunicode zcommon znvpair zavl ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CurrentDesktop: Unity Date: Thu Sep 1 14:40:27 2016 InstallationDate: Installed on 2016-05-06 (117 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) SourcePackage: qtdeclarative-opensource-src UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qtdeclarative-opensource-src/+bug/1619281/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
