[Poppler-bugs] [Bug 4536] folding lines not displayed on PDF files

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=4536

--- Comment #23 from Adrian Johnson <ajohnson at redneon.com> 2011-08-23 04:52:24 PDT ---
Created an attachment (id=50481)
 View: https://bugs.freedesktop.org/attachment.cgi?id=50481
 Review: https://bugs.freedesktop.org/review?bug=4536&attachment=50481

set minimum line width to 1

PDF has a Stroke Adjust parameter than when true requires that lines be at
least 1 pixel wide. This patch adds a stroke_adjust parameter to CairoOutputDev
that when true adjusts lines with a device width of < 0.5 pixels to be 0.5
pixels wide.

Like the splash backend, the Stroke Adjust parameter is initialized from the
globalParam setting (with default value true) and overrides the setting in the
PDF file. This emulates Adobe Reader where the Stroke Adjust is controlled by
the "Enhance Thin Lines" setting in Preferences (defaults to true) that
overrides the SA in the PDF file.

I found a minimum line of of 0.5 to produce better results than using 1.0
because unaligned horizontal and vertical 1.0 width lines in cairo are rendered
2 pixels wide. The test case in bug 14315 is a good example.

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