Package: g3data Version: 1:1.5.1-1 Severity: normal Hi!
I noticed a problem with how g3data handles images with transparent pixels (such as PNG images using the alpha channel). If you try to load such an image with a transparent background: $ g3data transp-bg-image.png the image is shown on a gray area and thus its transparent background looks gray. I am not sure if the gray color depends on the window manager theme: if this is the case, it may be an issue with some themes which may result in unreadable plots... But anyway, the problem I am experiencing is another one: as soon as I move the mouse over the image, the zoom area begins to show the enlarged view of the mouse cross neighborhood in a messed up way, with all plot lines drawn over each other. I think this bug is caused by the refreshing strategy used by g3data: it probably draws the updated zoom view *over* the previous one, *without* first blanking the zoom area! This obviously works fine, as long as there are no transparent pixels; but an image with transparent background will fail to refresh properly, unless the area is blanked before the repainting occurs. The same refreshing strategy seems to be used on the main area, with the loaded image: after laying some points down, I click on the "Remove all points" button; the previously layed down points are still visible on the transparent background, even though they appear as if they were *under* the non-transparent plot lines. This is confusing at best. In summary, the zoom area is mostly unusable when dealing with images having a transparent background. Moreover, understanding which points are still present and which were effectively removed is almost impossible, when dealing with transparent background images. I think a refresh strategy with explicit blanking should be implemented in order to avoid such issues. Please forward this bug report to upstream, if appropriate. Thanks in advance. -- System Information: Debian Release: squeeze/sid APT prefers testing APT policy: (800, 'testing'), (500, 'unstable') Architecture: amd64 (x86_64) Kernel: Linux 2.6.26-2-amd64 (SMP w/2 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Versions of packages g3data depends on: ii libatk1.0-0 1.24.0-2 The ATK accessibility toolkit ii libc6 2.9-4 GNU C Library: Shared libraries ii libcairo2 1.8.6-2+b1 The Cairo 2D vector graphics libra ii libfontconfig1 2.6.0-3 generic font configuration library ii libfreetype6 2.3.9-4.1 FreeType 2 font engine, shared lib ii libglib2.0-0 2.20.0-2 The GLib library of C routines ii libgtk2.0-0 2.16.1-2 The GTK+ graphical user interface ii libpango1.0-0 1.24.0-3+b1 Layout and rendering of internatio g3data recommends no packages. g3data suggests no packages. -- no debconf information -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
