Just for information: The bug was introduced by the commit 0e037561c325def364f93871abf4d5294ce61802 on Oct 10, 2012 (https://github.com/GNOME/gnome-control-center/commit/0e037561c325def364f93871abf4d5294ce61802#diff-4253d68594c0375c66352c8859f33117)
And was corrected by 04f1094cc5c27197d53fa8ebcf6e6e640c1d5a72 on Sep 08, 2013 (https://github.com/GNOME/gnome-control-center/commit/04f1094cc5c27197d53fa8ebcf6e6e640c1d5a72) To sum up: Before the first commit, the background preview in the background panel was created by these steps: - Load the background picture (GdkPixbuf). - Do a screenshot of the whole Desktop (GdkPixbuf). - Transform the screenshot GdkPixbuf into surface and cairo_t. - Remove (clear) the "workarea" from the screenshot (cairo_t). - Convert the resulting surface into a GdkPixbuf. - Merge background picture and the screenshot-whitout-workarea. Someone wrote about a possible improvment in the case of contiguous workarea like in Gnome-Shell case. So the steps after the first commit was: - Load the background picture (GdkPixbuf). - In case of workarea contiguous... - Compute the non-workarea geometry based on monitor and workarea geometry. - Do a ScreenshotArea of the non-workarea instead of the whole Desktop. - Convert the ScreenshotArea into surface and cairo_t. - Convert the resulting surface into a GdkPixbuf. - Merge background picture and the screenshot-only-non-workarea. - In case of workarea non-contiguous... - Same as before commit. The only problem was the conversion of the surface into a GdkPixbuf. The surface geometry was based on the screenshot geometry (in fact, a ScreenshotArea with smaller geometry (example: if monitor geometry is 1920x1080, the non-workarea is 1920x27)) but the GdkPixbuf was based on the monitor geometry. This difference produced a segfault when the function responsible of the conversion was trying to access the surface pixels data based on the monitor gemoetry. The second commit resolve this problem. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
