test/a1-image-sample.c

   1 /*
   2  * Copyright © 2008 Red Hat, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  * Author: Carl D. Worth <cworth@cworth.org>
  25  */
  26
  27 #include "cairo-test.h"
  28
  29 static cairo_test_draw_function_t draw;
  30
  31 #define POINTS  10
  32 #define STEP    (1.0 / POINTS)
  33 #define PAD     1
  34 #define WIDTH   (PAD + POINTS * 2 + PAD)
  35 #define HEIGHT  (WIDTH)
  36
  37 cairo_test_t test = {
  38     "a1-image-sample",
  39     "Test sample position when drawing images with FILTER_NEAREST",
  40     WIDTH, HEIGHT,
  41     draw
  42 };
  43
  44 /* A single, black pixel */
  45 static const uint32_t black_pixel = 0xff000000;
  46
  47 static cairo_test_status_t
  48 draw (cairo_t *cr, int width, int height)
  49 {
  50     int i, j;
  51     cairo_surface_t *surface;
  52
  53     surface = cairo_image_surface_create_for_data ((unsigned char *) &black_pixel,
  54                                                    CAIRO_FORMAT_ARGB32,
  55                                                    1, 1, 4);
  56
  57     /* Fill background white */
  58     cairo_set_source_rgb (cr, 1, 1, 1);
  59     cairo_paint (cr);
  60
  61     /* Draw in black */
  62     cairo_set_source_rgb (cr, 0, 0, 0);
  63
  64     cairo_translate (cr, PAD, PAD);
  65     cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
  66
  67     for (i = 0; i < POINTS; i++)
  68         for (j = 0; j < POINTS; j++) {
  69             cairo_set_source_surface (cr, surface,
  70                                       2 * i + i * STEP, 2 * j + j * STEP);
  71             cairo_pattern_set_filter (cairo_get_source (cr),
  72                                       CAIRO_FILTER_NEAREST);
  73             cairo_paint (cr);
  74         }
  75
  76     cairo_surface_destroy (surface);
  77
  78     return CAIRO_TEST_SUCCESS;
  79 }
  80
  81 int
  82 main (void)
  83 {
  84     return cairo_test (&test);
  85 }