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0d8a04ef47
Whilst investigating:
Bug 31788: SVG <line> with y1 == y2 and both with fractional
part don't render
https://bugs.webkit.org/show_bug.cgi?id=31788
I found that it can be reduced to a no-op clip following a no-op stroke
or fill. These conditions are exercised here and are shown to be a bug
introduced in the 1.9.x development series.
66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/*
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* Copyright 2009 Benjamin Otte
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Benjamin Otte not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Benjamin Otte makes no representations about the
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* suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* BENJAMIN OTTE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL BENJAMIN OTTE BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Benjamin Otte <otte@gnome.org>
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*/
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#include "cairo-test.h"
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#define WIDTH 50
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#define HEIGHT 50
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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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/* Neutral gray background */
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cairo_set_source_rgb (cr, 0.5, 0.5, 0.5);
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cairo_paint (cr);
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/* remove this clip operation and everything works */
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cairo_rectangle (cr, 10, 10, 30, 30);
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cairo_clip (cr);
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/* remove this no-op and everything works */
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cairo_fill (cr);
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/* make the y coordinates integers and everything works */
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cairo_move_to (cr, 20, 20.101562);
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cairo_line_to (cr, 30, 20.101562);
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/* This clip operation should fail to work. But with cairo 1.9, if all the
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* 3 cases above happen, the clip will not work and the paint will happen.
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*/
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cairo_save (cr); {
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cairo_set_source_rgba (cr, 1, 0.5, 0.5, 1);
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cairo_clip_preserve (cr);
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cairo_paint (cr);
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} cairo_restore (cr);
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (clip_fill_no_op,
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"Exercises a bug found by Benjamin Otte whereby a no-op clip is nullified by a stroke",
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"clip, fill", /* keywords */
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NULL, /* requirements */
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WIDTH, HEIGHT,
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NULL, draw)
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