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15ad6ca3e1
Run the command below suggested by geirha in ##sed@irc.freenode.net. git grep -l 'http://.*cairographics.org' | xargs sed -i 's|http\(://\([[:alnum:].-]*\.\)\{0,1\}cairographics\.org\)|https\1|g' Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
/*
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* Copyright © 2009 M Joonas Pihlaja
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Author: M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
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*/
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#include "cairo-test.h"
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/* When faced with very small dash lengths the stroker is liable to
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* get stuck in an infinite loop when advancing the dash offset. This
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* test attempts to hit each of the locations in the stroker code
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* where the dash offset is advanced in a loop.
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*
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* Reported to the cairo mailing list by Hans Breuer.
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* https://lists.cairographics.org/archives/cairo/2009-June/017506.html
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*/
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#define EPS 1e-30
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/* This should be comfortably smaller than the unit epsilon of the
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* floating point type used to advance the dashing, yet not small
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* enough that it underflows to zero. 1e-30 works to foil up to 80
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* bit extended precision arithmetic. We want to avoid zero dash
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* lengths because those trigger special processing in the stroker. */
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static void
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do_dash (cairo_t *cr, double dx, double dy, double offset)
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{
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/* Set the dash pattern to be predominantly ON so that we can
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* create a reference image by just ignoring the dashing. */
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static double dash[] = { EPS, EPS/512 };
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cairo_set_dash (cr, dash, 2, offset);
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cairo_move_to (cr, 10, 10);
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cairo_rel_line_to (cr, dx, dy);
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cairo_stroke (cr);
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cairo_translate (cr, dx, dy);
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}
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static cairo_test_status_t
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draw (cairo_t *cr, int width, int height)
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{
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(void)width; (void)height;
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cairo_set_source_rgb (cr, 1,1,1);
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cairo_paint (cr);
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cairo_set_source_rgb (cr, 0,0,0);
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cairo_set_line_width (cr, 10);
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/* The following calls will wedge in various places that try
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* to advance the dashing in a loop inside the stroker. */
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do_dash (cr, 30, 30, 0); /* _cairo_stroker_line_to_dashed */
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do_dash (cr, 30, 0, 0); /* _cairo_rectilinear_stroker_line_to_dashed */
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do_dash (cr, 30, 30, 1); /* _cairo_stroker_dash_start */
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (dash_infinite_loop,
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"Test dashing with extremely small dash lengths.",
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"dash",
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NULL,
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100, 100,
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NULL, draw);
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