Created attachment 590514 [details] Image of the rendering bug Description of problem: When using the mingw32-webkitgtk package on Windows, often times black boxes will be displayed around text boxes and button widgets. Attached is a screenshot of the xombrero browser running on windows displaying this bug. Version-Release number of selected component (if applicable): mingw32-webkitgtk-1.8.0-1.fc18_1.8.1-1.fc18.noarch.drpm Steps to Reproduce: 1. Download and install xombrero for windows (comes with rawhide webkitgtk) from this link: https://opensource.conformal.com/snapshots/xombrero/windows/ 2. Open to the webpage in the attached screenshot (https://opensource.conformal.com/wiki/Main_Page)
webkitgtk tries to draw gtk widgets by using alpha compositing. gtk2 however doesn't support this very well (e.g. see the comment about Windows backend at http://developer.gnome.org/gdk/stable/GdkScreen.html#gdk-screen-get-rgba-colormap) and instead of transparency, we just get black colour. This is certainly fixable, but unfortunately webkitgtk Windows backend isn't receiving much attention upstream, and the gtk2 support is also slowly getting phased out. The issue is gone with gtk3, and I plan to do a mingw32-webkitgtk3 package that's built against gtk3 soon. Would that work for you? See also the upstream report discussing the same issue: https://bugs.webkit.org/show_bug.cgi?id=79680#c3
Thanks for the quick response and finding the bug upstream. Unfortunately, switching to gtk3 at this time isn't really an option for us (it's a lot of work, and we want to make the gtk3 switch at the same time that the webkit2gtk api goes stable).
Also, another one of our devs has noticed that the openSUSE package does not have this rendering issue, so maybe they have worked out a solution. It would be great if this was also working with the rawhide package! Link to the package: http://ftp5.gwdg.de/pub/opensuse/repositories/windows:/mingw:/win32/openSUSE_Factory/noarch/mingw32-libwebkitgtk-1.6.1-2.38.noarch.rpm
It's caused by the version difference. mingw32-webkitgtk-1.6.1-1.fc16 from Fedora 16 doesn't have this issue either. webkitgtk has fallback code that tries to work around the missing alpha channel support, but unfortunately it's broken with 1.8. There was a big rendering rework and the gtk2 port now uses a cairo surface for backing store. Previously, when there was a GdkWindow associated, the fallback code simply drew directly on the GdkWindow. But now that the backing store is a cairo surface, it's not so simple any more with gtk2 (with gtk3 the cairo surface is a perfect fit). http://kojipkgs.fedoraproject.org/packages/mingw32-webkitgtk/1.6.1/1.fc16/noarch/mingw32-webkitgtk-1.6.1-1.fc16.noarch.rpm
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle. Changing version to '19'. (As we did not run this process for some time, it could affect also pre-Fedora 19 development cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.) More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora19
This message is a notice that Fedora 19 is now at end of life. Fedora has stopped maintaining and issuing updates for Fedora 19. It is Fedora's policy to close all bug reports from releases that are no longer maintained. Approximately 4 (four) weeks from now this bug will be closed as EOL if it remains open with a Fedora 'version' of '19'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 19 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete.
Fedora 19 changed to end-of-life (EOL) status on 2015-01-06. Fedora 19 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.