test/paint-with-alpha.c

   1 /*
   2  * Copyright © 2005 Red Hat, Inc.
   3  * Copyright © 2006 Red Hat, Inc.
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software
   6  * and its documentation for any purpose is hereby granted without
   7  * fee, provided that the above copyright notice appear in all copies
   8  * and that both that copyright notice and this permission notice
   9  * appear in supporting documentation, and that the name of
  10  * Red Hat, Inc. not be used in advertising or publicity pertaining to
  11  * distribution of the software without specific, written prior
  12  * permission. Red Hat, Inc. makes no representations about the
  13  * suitability of this software for any purpose.  It is provided "as
  14  * is" without express or implied warranty.
  15  *
  16  * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  17  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  18  * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
  19  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  20  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  21  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
  22  * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  23  *
  24  * Author: Carl D. Worth <cworth@cworth.org>
  25  */
  26
  27 #include "cairo-test.h"
  28
  29 static uint32_t data[16] = {
  30     0xffffffff, 0xffffffff,             0xffff0000, 0xffff0000,
  31     0xffffffff, 0xffffffff,             0xffff0000, 0xffff0000,
  32
  33     0xff00ff00, 0xff00ff00,             0xff0000ff, 0xff0000ff,
  34     0xff00ff00, 0xff00ff00,             0xff0000ff, 0xff0000ff
  35 };
  36 static cairo_test_status_t
  37 draw (cairo_t *cr, int width, int height)
  38 {
  39     cairo_surface_t *surface;
  40
  41     surface = cairo_image_surface_create_for_data ((unsigned char *) data,
  42                                                    CAIRO_FORMAT_RGB24, 4, 4, 16);
  43
  44     cairo_test_paint_checkered (cr);
  45
  46     cairo_scale (cr, 4, 4);
  47
  48     cairo_set_source_surface (cr, surface, 2 , 2);
  49     cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
  50     cairo_paint_with_alpha (cr, 0.5);
  51
  52     cairo_surface_finish (surface); /* data will go out of scope */
  53     cairo_surface_destroy (surface);
  54
  55     return CAIRO_TEST_SUCCESS;
  56 }
  57
  58 static cairo_test_status_t
  59 draw_solid_clip (cairo_t *cr, int width, int height)
  60 {
  61     cairo_test_paint_checkered (cr);
  62
  63     cairo_rectangle (cr, 2.5, 2.5, 27, 27);
  64     cairo_clip (cr);
  65
  66     cairo_set_source_rgb (cr, 1., 0.,0.);
  67     cairo_paint_with_alpha (cr, 0.5);
  68
  69     return CAIRO_TEST_SUCCESS;
  70 }
  71
  72 static cairo_test_status_t
  73 draw_clip (cairo_t *cr, int width, int height)
  74 {
  75     cairo_surface_t *surface;
  76
  77     surface = cairo_image_surface_create_for_data ((unsigned char *) data,
  78                                                    CAIRO_FORMAT_RGB24, 4, 4, 16);
  79
  80     cairo_test_paint_checkered (cr);
  81
  82     cairo_rectangle (cr, 10.5, 10.5, 11, 11);
  83     cairo_clip (cr);
  84
  85     cairo_scale (cr, 4, 4);
  86
  87     cairo_set_source_surface (cr, surface, 2 , 2);
  88     cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
  89     cairo_paint_with_alpha (cr, 0.5);
  90
  91     cairo_surface_finish (surface); /* data will go out of scope */
  92     cairo_surface_destroy (surface);
  93
  94     return CAIRO_TEST_SUCCESS;
  95 }
  96
  97 static cairo_test_status_t
  98 draw_clip_mask (cairo_t *cr, int width, int height)
  99 {
 100     cairo_surface_t *surface;
 101
 102     surface = cairo_image_surface_create_for_data ((unsigned char *) data,
 103                                                    CAIRO_FORMAT_RGB24, 4, 4, 16);
 104
 105     cairo_test_paint_checkered (cr);
 106
 107     cairo_move_to (cr, 16, 5);
 108     cairo_line_to (cr, 5, 16);
 109     cairo_line_to (cr, 16, 27);
 110     cairo_line_to (cr, 27, 16);
 111     cairo_clip (cr);
 112
 113     cairo_scale (cr, 4, 4);
 114
 115     cairo_set_source_surface (cr, surface, 2 , 2);
 116     cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
 117     cairo_paint_with_alpha (cr, 0.5);
 118
 119     cairo_surface_finish (surface); /* data will go out of scope */
 120     cairo_surface_destroy (surface);
 121
 122     return CAIRO_TEST_SUCCESS;
 123 }
 124
 125 CAIRO_TEST (paint_with_alpha,
 126             "Simple test of cairo_paint_with_alpha",
 127             "paint, alpha", /* keywords */
 128             NULL, /* requirements */
 129             32, 32,
 130             NULL, draw)
 131 CAIRO_TEST (paint_with_alpha_solid_clip,
 132             "Simple test of cairo_paint_with_alpha+unaligned clip",
 133             "paint, alpha, clip", /* keywords */
 134             NULL, /* requirements */
 135             32, 32,
 136             NULL, draw_solid_clip)
 137 CAIRO_TEST (paint_with_alpha_clip,
 138             "Simple test of cairo_paint_with_alpha+unaligned clip",
 139             "paint, alpha, clip", /* keywords */
 140             NULL, /* requirements */
 141             32, 32,
 142             NULL, draw_clip)
 143 CAIRO_TEST (paint_with_alpha_clip_mask,
 144             "Simple test of cairo_paint_with_alpha+unaligned clip",
 145             "paint, alpha, clip", /* keywords */
 146             NULL, /* requirements */
 147             32, 32,
 148             NULL, draw_clip_mask)