Grcov report - mesh-pattern-accuracy.c

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/*

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 * Copyright © 2009 Adrian Johnson

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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: Adrian Johnson <ajohnson@redneon.com>

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*/

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#include "cairo-test.h"

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#include <float.h>

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#define SIZE 256

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/* This test is designed to test the accuracy of the rendering of mesh

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 * patterns.

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 * Color accuracy is tested by a square patch covering the whole

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 * surface with black and white corners.

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 * Extents accuracy is checked by a small red square patch at the

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 * center of the surface which should measure 2x2 pixels.

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*/

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static cairo_test_status_t

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3

draw (cairo_t *cr, int width, int height)

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    cairo_pattern_t *pattern;

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    double offset;

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    cairo_test_paint_checkered (cr);

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    pattern = cairo_pattern_create_mesh ();

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    cairo_mesh_pattern_begin_patch (pattern);

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    cairo_mesh_pattern_move_to (pattern, 0, 0);

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3

    cairo_mesh_pattern_line_to (pattern, 1, 0);

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3

    cairo_mesh_pattern_line_to (pattern, 1, 1);

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3

    cairo_mesh_pattern_line_to (pattern, 0, 1);

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3

    cairo_mesh_pattern_set_corner_color_rgb (pattern, 0, 0, 0, 0);

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    cairo_mesh_pattern_set_corner_color_rgb (pattern, 1, 1, 1, 1);

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3

    cairo_mesh_pattern_set_corner_color_rgb (pattern, 2, 0, 0, 0);

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3

    cairo_mesh_pattern_set_corner_color_rgb (pattern, 3, 1, 1, 1);

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    cairo_mesh_pattern_end_patch (pattern);

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3

    cairo_mesh_pattern_begin_patch (pattern);

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    /* A small 1x1 red patch, that should be rendered as a 2x2 red

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     * square in the center of the image */

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    offset = 0.5 / SIZE;

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    cairo_mesh_pattern_move_to (pattern, 0.5 + offset, 0.5 + offset);

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    cairo_mesh_pattern_line_to (pattern, 0.5 + offset, 0.5 - offset);

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    cairo_mesh_pattern_line_to (pattern, 0.5 - offset, 0.5 - offset);

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    cairo_mesh_pattern_line_to (pattern, 0.5 - offset, 0.5 + offset);

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    cairo_mesh_pattern_set_corner_color_rgb (pattern, 0, 1, 0, 0);

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    cairo_mesh_pattern_set_corner_color_rgb (pattern, 1, 1, 0, 0);

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    cairo_mesh_pattern_set_corner_color_rgb (pattern, 2, 1, 0, 0);

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    cairo_mesh_pattern_set_corner_color_rgb (pattern, 3, 1, 0, 0);

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    cairo_mesh_pattern_end_patch (pattern);

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    cairo_scale (cr, SIZE, SIZE);

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    cairo_set_source (cr, pattern);

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    cairo_paint (cr);

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    cairo_pattern_destroy (pattern);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (mesh_pattern_accuracy,

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	    "Paint mesh pattern",

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	    "mesh, pattern", /* keywords */

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	    NULL, /* requirements */

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	    SIZE, SIZE,

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	    NULL, draw)