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https://gitlab.freedesktop.org/cairo/cairo.git
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77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
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/*
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* Copyright 2011 Intel Corporation
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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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* Chris Wilson 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. Chris Wilson 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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* CHRIS WILSON 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 CHRIS WILSON 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: Chris Wilson <chris@chris-wilson.co.uk>
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*/
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/* Exercises a bug spotted by Andrea Canciani where the polygon clipping
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* code was hopeless broken with horizontal edges.
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*/
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#include "cairo-test.h"
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#define WIDTH 20
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#define HEIGHT 20
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#define BUG 1
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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_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_move_to (cr, 0-256, 4 - BUG);
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cairo_line_to (cr, WIDTH + 256, 4 + BUG);
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cairo_line_to (cr, WIDTH + 256, 2 - BUG);
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cairo_line_to (cr, 0-256, 2 + BUG);
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cairo_fill (cr);
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cairo_move_to (cr, 0-256, 6 - BUG);
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cairo_line_to (cr, WIDTH + 256, 6 + BUG);
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cairo_line_to (cr, WIDTH + 256, 8 - BUG);
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cairo_line_to (cr, 0-256, 8 + BUG);
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cairo_fill (cr);
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cairo_move_to (cr, WIDTH+256, 12 - BUG);
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cairo_line_to (cr, 0-256, 12 + BUG);
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cairo_line_to (cr, 0-256, 14 - BUG);
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cairo_line_to (cr, WIDTH+256, 14 + BUG);
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cairo_fill (cr);
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cairo_move_to (cr, WIDTH+256, 18 - BUG);
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cairo_line_to (cr, 0-256, 18 + BUG);
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cairo_line_to (cr, 0-256, 16 - BUG);
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cairo_line_to (cr, WIDTH+256, 16 + BUG);
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cairo_fill (cr);
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (horizontal_clip,
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"Tests intersection of a nearly horizontal lines with a clipped polygon",
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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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