Launchpad has imported 6 comments from the remote bug at https://bugs.freedesktop.org/show_bug.cgi?id=77298.
If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. ------------------------------------------------------------------------ On 2014-04-11T02:43:50+00:00 Jürgen Weigert wrote: Since 1.12.3, cairo cannot render fine lines to pdf. 1.12.2 was the last version that worked. http://cgit.freedesktop.org/cair/diff/?id=bdf83008f4b2c723fd8e65e2a92bc47a2e7bc442 introduced this code in cairo-compositor.c:_cairo_compositor_stroke if (_cairo_pen_vertices_needed (tolerance, style->line_width/2, ctm) <= 1) return CAIRO_INT_STATUS_NOTHING_TO_DO; The idea was to avoid lines that would be invisible when rasterized. While this is a valid logic for raster backends, it is a bad idea for PDF output. There we want to see all fine lines. My specific use case is generating a lasercutter drawing for an Epilog Zing laser with inkscape. There the hardware would raster anything thicker than 0.02mm, and cut 0.01mm or below. 1.12.3 skips lines below 0.036mm, 1.13.1 skips lines below 0.018mm -- which is still not enough to safely drive my lasercutter. See also https://bugs.launchpad.net/inkscape/+bug/1174909 Check out the attached reproducer. Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1306846/comments/0 ------------------------------------------------------------------------ On 2014-04-11T02:45:43+00:00 Jürgen Weigert wrote: Created attachment 97205 reproducer Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1306846/comments/1 ------------------------------------------------------------------------ On 2014-04-11T02:48:52+00:00 Jürgen Weigert wrote: Created attachment 97206 Example output from the reproducer with missing objects. Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1306846/comments/2 ------------------------------------------------------------------------ On 2014-04-11T02:51:20+00:00 Jürgen Weigert wrote: Created attachment 97207 Example output from the reproducer when good. Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1306846/comments/3 ------------------------------------------------------------------------ On 2014-04-11T12:43:41+00:00 Jürgen Weigert wrote: Created attachment 97220 suggested fix. Please double check if num_vertices == 1 should never be done (for PDF). I am not sure why this was introduced at all. With 1.12.2 the lowest num_vertices value was 4, which assured that all objects are rendered to the PDF. Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1306846/comments/4 ------------------------------------------------------------------------ On 2014-04-12T00:44:29+00:00 Jürgen Weigert wrote: Created attachment 97247 Suggested fix. Different approach. Contributed by Patrick Himmelmann. Now we have something to discuss. Maybe we find a third alternative, so that the logic for raster backends continues to discard small objects, but the logic for vector backends includes everything? Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1306846/comments/5 ** Changed in: libcairo Status: Unknown => Confirmed ** Changed in: libcairo Importance: Unknown => Medium -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to cairo in Ubuntu. https://bugs.launchpad.net/bugs/1306846 Title: Inkscape (using cairo) fails to print thin lines to PDF Status in libcairo - cairo vector graphics library: Confirmed Status in “cairo” package in Ubuntu: Triaged Bug description: Since 1.12.3, cairo cannot render fine lines to pdf. 1.12.2 was the last version that worked. http://cgit.freedesktop.org/cair/diff/?id=bdf83008f4b2c723fd8e65e2a92bc47a2e7bc442 introduced code to avoid lines that would be invisible when rasterized. While this is a valid logic for raster backends, it is a bad idea for PDF output. There we want to see all fine lines. My specific use case is generating a lasercutter drawing for an Epilog Zing laser with inkscape. There the hardware would raster anything thicker than 0.02mm, and cut 0.01mm or below. 1.12.3 skips lines below 0.036mm, 1.13.1 skips lines below 0.018mm -- which is still not enough to safely drive my lasercutter. Previously reported against inkscape: https://bugs.launchpad.net/inkscape/+bug/1174909 Also reported agains cairo upstream with a suggested fix: https://bugs.freedesktop.org/show_bug.cgi?id=77298 Check out the attached reproducer and fix. I'd suggest to circulate patched ubuntu packages, until upstream releases an official fix. To manage notifications about this bug go to: https://bugs.launchpad.net/libcairo/+bug/1306846/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
