Grcov report - in-fill-empty-trapezoid.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 cairo_in_fill () function can sometimes produce false

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 *  positives when the tessellator produces empty trapezoids

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 *  and the query point lands exactly on a trapezoid edge.

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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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preamble (cairo_test_context_t *ctx)

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    int x,y;

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    int width = 10;

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    int height = 10;

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    cairo_surface_t *surf;

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    cairo_t *cr;

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    int false_positive_count = 0;

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    cairo_status_t status;

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    cairo_test_status_t ret;

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    surf = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);

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    cr = cairo_create (surf);

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    cairo_surface_destroy (surf);

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    /* Empty horizontal trapezoid. */

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    cairo_move_to (cr, 0, height/3);

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    cairo_line_to (cr, width, height/3);

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    cairo_close_path (cr);

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    /* Empty non-horizontal trapezoid #1. */

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    cairo_move_to (cr, 0, 0);

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    cairo_line_to (cr, width, height/2);

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    cairo_close_path (cr);

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    /* Empty non-horizontal trapezoid #2 intersecting #1. */

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    cairo_move_to (cr, 0, height/2);

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    cairo_line_to (cr, width, 0);

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    cairo_close_path (cr);

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    status = cairo_status (cr);

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    /* Point sample the tessellated path. */

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    for (y = 0; y < height; y++) {

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	for (x = 0; x < width; x++) {

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	    if (cairo_in_fill (cr, x, y)) {

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		false_positive_count++;

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    cairo_destroy (cr);

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    /* Check that everything went well. */

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    ret = CAIRO_TEST_SUCCESS;

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    if (CAIRO_STATUS_SUCCESS != status) {

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	cairo_test_log (ctx, "Failed to create a test surface and path: %s\n",

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			cairo_status_to_string (status));

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	ret = CAIRO_TEST_XFAILURE;

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    if (0 != false_positive_count) {

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	cairo_test_log (ctx, "Point sampling found %d false positives "

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			"from cairo_in_fill()\n",

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			false_positive_count);

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	ret = CAIRO_TEST_XFAILURE;

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    return ret;

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/*

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 * XFAIL: The cairo_in_fill () function can sometimes produce false positives

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 * when the tessellator produces empty trapezoids and the query point lands

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 * exactly on a trapezoid edge.

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*/

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CAIRO_TEST (in_fill_empty_trapezoid,

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	    "Test that the tessellator isn't producing obviously empty trapezoids",

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	    "in, trap", /* keywords */

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	    NULL, /* requirements */

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	    0, 0,

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	    preamble, NULL)