text: /*
   * 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)
  