Grcov report - fill-missed-stop.c

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/*

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 * Copyright © 2006 M Joonas Pihlaja

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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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 * 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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 * 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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 * Author: M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>

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*/

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/* Bug history

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 * 2006-12-05  M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>

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 *  The tessellator has a regression where a trapezoid may continue

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 *  below the end of a polygon edge (i.e. the bottom of the trapezoid

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 *  is miscomputed.)  This can only happen if the right edge of a

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 *  trapezoid stops earlier than the left edge and there is no start

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 *  event at the end point of the right edge.

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*/

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#include "cairo-test.h"

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#define SIZE 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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    cairo_set_source_rgb (cr, 1, 0, 0);

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    cairo_translate (cr, 1, 1);

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    /* What it should look like, with # marking the filled areas:

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     * |\    |\

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     * |#\   |#\

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     * |##\__|##\

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     *     \#|

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     *      \|

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     * What it looke like with the bug, when the rightmost edge's end

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     * is missed:

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     * |\    |\

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     * |#\   |#\

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     * |##\__|##\

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     *     \#####|

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     *      \####|

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*/

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    cairo_move_to (cr, 0, 0);

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    cairo_line_to (cr, SIZE/2, SIZE);

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    cairo_line_to (cr, SIZE/2, 0);

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    cairo_line_to (cr, SIZE, SIZE/2);

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    cairo_line_to (cr, 0, SIZE/2);

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    cairo_close_path (cr);

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    cairo_fill (cr);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (fill_missed_stop,

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	    "Tests that the tessellator doesn't miss stop events when generating trapezoids",

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	    "fill", /* keywords */

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	    NULL, /* requirements */

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	    SIZE+3, SIZE+3,

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	    NULL, draw)