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/*
* Copyright © 2009 Adrian Johnson
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Author: Adrian Johnson <ajohnson@redneon.com>
*/
#include "cairo-test.h"
#include <float.h>
#define SIZE 256
/* This test is designed to test the accuracy of the rendering of mesh
* patterns.
*
* Color accuracy is tested by a square patch covering the whole
* surface with black and white corners.
*
* Extents accuracy is checked by a small red square patch at the
* center of the surface which should measure 2x2 pixels.
*/
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_pattern_t *pattern;
double offset;
cairo_test_paint_checkered (cr);
pattern = cairo_pattern_create_mesh ();
cairo_mesh_pattern_begin_patch (pattern);
cairo_mesh_pattern_move_to (pattern, 0, 0);
cairo_mesh_pattern_line_to (pattern, 1, 0);
cairo_mesh_pattern_line_to (pattern, 1, 1);
cairo_mesh_pattern_line_to (pattern, 0, 1);
cairo_mesh_pattern_set_corner_color_rgb (pattern, 0, 0, 0, 0);
cairo_mesh_pattern_set_corner_color_rgb (pattern, 1, 1, 1, 1);
cairo_mesh_pattern_set_corner_color_rgb (pattern, 2, 0, 0, 0);
cairo_mesh_pattern_set_corner_color_rgb (pattern, 3, 1, 1, 1);
cairo_mesh_pattern_end_patch (pattern);
cairo_mesh_pattern_begin_patch (pattern);
/* A small 1x1 red patch, that should be rendered as a 2x2 red
* square in the center of the image */
offset = 0.5 / SIZE;
cairo_mesh_pattern_move_to (pattern, 0.5 + offset, 0.5 + offset);
cairo_mesh_pattern_line_to (pattern, 0.5 + offset, 0.5 - offset);
cairo_mesh_pattern_line_to (pattern, 0.5 - offset, 0.5 - offset);
cairo_mesh_pattern_line_to (pattern, 0.5 - offset, 0.5 + offset);
cairo_mesh_pattern_set_corner_color_rgb (pattern, 0, 1, 0, 0);
cairo_mesh_pattern_set_corner_color_rgb (pattern, 1, 1, 0, 0);
cairo_mesh_pattern_set_corner_color_rgb (pattern, 2, 1, 0, 0);
cairo_mesh_pattern_set_corner_color_rgb (pattern, 3, 1, 0, 0);
cairo_mesh_pattern_end_patch (pattern);
cairo_scale (cr, SIZE, SIZE);
cairo_set_source (cr, pattern);
cairo_paint (cr);
cairo_pattern_destroy (pattern);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (mesh_pattern_accuracy,
"Paint mesh pattern",
"mesh, pattern", /* keywords */
NULL, /* requirements */
SIZE, SIZE,
NULL, draw)
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