cairo/test/device-offset.c

   1 /*
   2  * Copyright © 2006 Red Hat, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software
   5  * and its documentation for any purpose is hereby granted without
   6  * fee, provided that the above copyright notice appear in all copies
   7  * and that both that copyright notice and this permission notice
   8  * appear in supporting documentation, and that the name of
   9  * Red Hat, Inc. not be used in advertising or publicity pertaining to
  10  * distribution of the software without specific, written prior
  11  * permission. Red Hat, Inc. makes no representations about the
  12  * suitability of this software for any purpose.  It is provided "as
  13  * is" without express or implied warranty.
  14  *
  15  * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
  18  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  19  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  20  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
  21  * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22  *
  23  * Author: Carl D. Worth <cworth@cworth.org>
  24  */
  25
  26 #include "cairo-test.h"
  27 #include <stddef.h>
  28
  29 #define SIZE 10
  30 #define PAD 2
  31
  32 static cairo_test_draw_function_t draw;
  33
  34 static const cairo_test_t test = {
  35     "device-offset",
  36     "Simple test using a surface with a negative device-offset as a source.",
  37     SIZE, SIZE,
  38     draw
  39 };
  40
  41 static void
  42 draw_square (cairo_t *cr)
  43 {
  44     cairo_rectangle (cr,
  45                      PAD, PAD,
  46                      SIZE - 2 * PAD,
  47                      SIZE - 2 * PAD);
  48     cairo_fill (cr);
  49 }
  50
  51 static cairo_test_status_t
  52 draw (cairo_t *cr, int width, int height)
  53 {
  54     cairo_surface_t *surface, *target;
  55     cairo_t *cr2;
  56
  57     /* First draw a shape in blue on the original destination. */
  58     cairo_set_source_rgb (cr, 0, 0, 1); /* blue */
  59     draw_square (cr);
  60
  61     /* Then, create an offset surface and repeat the drawing in red. */
  62     target = cairo_get_group_target (cr);
  63     surface = cairo_surface_create_similar (target,
  64                                             cairo_surface_get_content (target),
  65                                             SIZE / 2, SIZE / 2);
  66     cairo_surface_set_device_offset (surface, - SIZE / 2, - SIZE / 2);
  67     cr2 = cairo_create (surface);
  68     cairo_surface_destroy (surface);
  69
  70     cairo_set_source_rgb (cr2, 1, 0, 0); /* red */
  71     draw_square (cr2);
  72
  73
  74     /* Finally, copy the offset surface to the original destination.
  75     * The final result should be a blue square with the lower-right
  76     * quarter red. */
  77     cairo_set_source_surface (cr, cairo_get_target (cr2), 0, 0);
  78     cairo_destroy (cr2);
  79
  80     cairo_paint (cr);
  81
  82
  83     return CAIRO_TEST_SUCCESS;
  84 }
  85
  86 int
  87 main (void)
  88 {
  89     return cairo_test (&test);
  90 }