[cairo-bugs] [Bug 77298] New: inkscape fails to print thin lines to PDF

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77298

          Priority: medium
            Bug ID: 77298
          Assignee: ajohnson at redneon.com
           Summary: inkscape fails to print thin lines to PDF
        QA Contact: cairo-bugs at cairographics.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jnweiger at gmail.com
          Hardware: Other
            Status: NEW
           Version: 1.12.16
         Component: pdf backend
           Product: cairo

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.

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