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655a4dbc36
Instead of tagging the sources, which is insensitive to changes, track the known failure modes by recording the current fail as an xfail.png reference. (We also introduce a new.png to track a fresh error, so that they are not lost in the noise of the old XFAILs and hopefully do not cause everyone to fret). As we have removed the XFAIL tagging we find, surprise surprise, that some tests are now working -- so review all the reference images (as also some .ref.png now should be .xfail.png). Note: I've only checked image,pdf,ps,svg. The test surfaces report some failures that probably need to addressed in source. I've not correct the changes for win32 and quartz. Nor fixed up the experimental backends.
84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
/*
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* Copyright © 2005 Red Hat, Inc.
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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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* Red Hat, Inc. 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. Red Hat, Inc. 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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* RED HAT, INC. 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 RED HAT, INC. 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: Carl D. Worth <cworth@cworth.org>
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*/
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/* Bug history
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*
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* 2005-06-01 Carl Worth <cworth@cworth.org>
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*
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* There's a long-standing bug in that self-intersecting paths give
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* an incorrect result when stroked. The problem is that the
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* trapezoids are generated incrementally along the stroke and as
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* such, are not disjoint. The errant intersections of these
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* trapezoids then leads to overfilled pixels.
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*
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* The test belows first creates and fills a path. Then it creates a
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* second path which has a stroked boundary identical to the first
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* filled path. But the results of the two operations are
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* different. The most obvious difference is in the central region
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* where the entire path intersects itself. But notice that every
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* time the path turns there are also errors on the inside of the
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* turn, (since the subsequent trapezoids along the path intersect).
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*/
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#include "cairo-test.h"
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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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cairo_translate (cr, 1.0, 1.0);
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cairo_set_source_rgb (cr, 1, 0, 0); /* red */
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/* First draw the desired shape with a fill */
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cairo_rectangle (cr, 0.5, 0.5, 4.0, 4.0);
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cairo_rectangle (cr, 3.5, 3.5, 4.0, 4.0);
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cairo_rectangle (cr, 3.5, 1.5, -2.0, 2.0);
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cairo_rectangle (cr, 6.5, 4.5, -2.0, 2.0);
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cairo_fill (cr);
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/* Then try the same thing with a stroke */
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cairo_translate (cr, 0, 10);
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cairo_move_to (cr, 1.0, 1.0);
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cairo_rel_line_to (cr, 3.0, 0.0);
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cairo_rel_line_to (cr, 0.0, 6.0);
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cairo_rel_line_to (cr, 3.0, 0.0);
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cairo_rel_line_to (cr, 0.0, -3.0);
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cairo_rel_line_to (cr, -6.0, 0.0);
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cairo_close_path (cr);
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cairo_set_line_width (cr, 1.0);
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cairo_stroke (cr);
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (self_intersecting,
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"Test strokes of self-intersecting paths"
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"\nSelf-intersecting strokes are wrong due to incremental trapezoidization.",
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"stroke, trap", /* keywords */
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NULL, /* requirements */
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10, 20,
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NULL, draw)
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