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/*
* Copyright © 2006 M Joonas Pihlaja
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of Joonas Pihlaja
* not be used in advertising or publicity pertaining to distribution
* of the software without specific, written prior permission.
* Joonas Pihlaja makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* JOONAS PIHLAJA DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
* NO EVENT SHALL JOONAS PIHLAJA BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
*/
/* Bug history
*
* 2006-12-05 M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
*
* The tessellator has a regression where a trapezoid may continue
* below the end of a polygon edge (i.e. the bottom of the trapezoid
* is miscomputed.) This can only happen if the right edge of a
* trapezoid stops earlier than the left edge and there is no start
* event at the end point of the right edge.
*/
#include "cairo-test.h"
static cairo_test_draw_function_t draw;
#define SIZE 50
cairo_test_t test = {
"fill-missed-stop",
"Tests that the tessellator doesn't miss stop events when generating trapezoids",
SIZE+3, SIZE+3,
draw
};
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_translate (cr, 1, 1);
/* What it should look like, with # marking the filled areas:
*
* |\ |\
* |#\ |#\
* |##\__|##\
* \#|
* \|
*
* What it looke like with the bug, when the rightmost edge's end
* is missed:
*
* |\ |\
* |#\ |#\
* |##\__|##\
* \#####|
* \####|
*/
cairo_move_to (cr, 0, 0);
cairo_line_to (cr, SIZE/2, SIZE);
cairo_line_to (cr, SIZE/2, 0);
cairo_line_to (cr, SIZE, SIZE/2);
cairo_line_to (cr, 0, SIZE/2);
cairo_close_path (cr);
cairo_fill (cr);
return CAIRO_TEST_SUCCESS;
}
int
main (void)
{
return cairo_test (&test);
}
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