Details
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Bug
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Resolution: Unresolved
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P3: Somewhat important
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None
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5.12.1, 5.12.2
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None
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macOS 10.13 with Xcode 10
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macOS
Description
To reproduce this problem, build and run the code below using Qt 5.12.1 or 5.12.2 on macOS. This will cause a bunch of runtime warnings to be dumped to the console. For example:
2019-03-18 14:41:05.304026-0700 project[46136:14509714] [com.yourcompany.project] CGBitmapContextCreate: unsupported parameter combination: set CGBITMAP_CONTEXT_LOG_ERRORS environmental variable to see the details 2019-03-18 14:41:05.304050-0700 project[46136:14509714] [com.yourcompany.project] CGContextTranslateCTM: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. 2019-03-18 14:41:05.304060-0700 project[46136:14509714] [com.yourcompany.project] CGContextScaleCTM: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. 2019-03-18 14:41:05.304067-0700 project[46136:14509714] [com.yourcompany.project] CGContextScaleCTM: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
#include <QApplication> #include <qdebug.h> #include <QFrame> #include <QStyle> #include <QStyleOptionFrame> #include <QPainter> #include <QWidget> int main(int argc, char *argv[]) { QApplication a(argc, argv); QWidget * ourwidget = new QWidget(); QStyleOptionFrame option; option.initFrom(ourwidget); QImage image(option.rect.size(), QImage::Format_ARGB32); QPainter imagepainter(&image); ourwidget->style()->drawPrimitive(QStyle::PE_FrameGroupBox, &option, &imagepainter, NULL); return a.exec(); }
I cannot reproduce this using the official 5.12.0 build, but can using the official 5.12.2 build. I am also able to reproduce using a self-built version from the 5.12 branch shortly after 5.12.1 was released.
I haven't confirmed it, but I suspect the commit that introduced this is:
commit 09e3457541c54b084365bfb77ad58474f0666374 Author: Tor Arne Vestbø <tor.arne.vestbo@qt.io>, Sun Nov 25 14:09:00 2018 +0100 (4 months ago) Committer: Tor Arne Vestbø <tor.arne.vestbo@qt.io>, Wed Nov 28 23:59:17 2018 +0000 (4 months ago) Follows: v5.12.0-beta4 Precedes: v5.12.1 Branches: <Expand> macOS: Share code for resolving CGImage bitmapInfor for a QImage Removes assumptions about QImage format in a few places. Change-Id: I515701be53190429a48956c31986fa0804806406 Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Our application uses code similar to the test case to draw a group box with a colored background. With Qt 5.12.1 or later, the color we set for the background isn't used, so the group box ends up being transparent.
