cairo/test/clip-nesting.c

   1 /*
   2  * Copyright © 2005 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: Owen Taylor <otaylor@redhat.com>
  24  */
  25
  26 #include <math.h>
  27 #include "cairo-test.h"
  28 #include <stdio.h>
  29
  30 #define SIZE 100
  31 #define BORDER 10
  32 #define LINE_WIDTH 20
  33
  34 static cairo_test_draw_function_t draw;
  35
  36 static const cairo_test_t test = {
  37     "clip-nesting",
  38     "Test clipping with multiple contexts for the same surface",
  39     SIZE, SIZE,
  40     draw
  41 };
  42
  43 static cairo_test_status_t
  44 draw (cairo_t *cr, int width, int height)
  45 {
  46     cairo_surface_t *target_surface;
  47     cairo_t *cr2, *cr3;
  48
  49     target_surface = cairo_get_group_target (cr);
  50
  51     cr2 = cairo_create (target_surface);
  52
  53     /* Draw a diagonal line and clip to it */
  54
  55     cairo_move_to (cr2, BORDER,                     BORDER);
  56     cairo_line_to (cr2, BORDER + LINE_WIDTH,        BORDER);
  57     cairo_line_to (cr2, SIZE - BORDER,              SIZE - BORDER);
  58     cairo_line_to (cr2, SIZE - BORDER - LINE_WIDTH, SIZE - BORDER);
  59
  60     cairo_clip (cr2);
  61     cairo_set_source_rgb (cr2, 0, 0, 1); /* Blue */
  62     cairo_paint (cr2);
  63
  64     /* Clipping affects this cairo_t */
  65
  66     cairo_set_source_rgb (cr2, 1, 1, 1); /* White */
  67     cairo_rectangle (cr2,
  68                      SIZE / 2 - LINE_WIDTH / 2, BORDER,
  69                      LINE_WIDTH,                SIZE - 2 * BORDER);
  70     cairo_fill (cr2);
  71
  72     /* But doesn't affect another cairo_t that we create temporarily for
  73      * the same surface
  74      */
  75     cr3 = cairo_create (target_surface);
  76     cairo_set_source_rgb (cr3, 1, 1, 1); /* White */
  77     cairo_rectangle (cr3,
  78                      SIZE - BORDER - LINE_WIDTH, BORDER,
  79                      LINE_WIDTH,                 SIZE - 2 * BORDER);
  80     cairo_fill (cr3);
  81
  82     cairo_destroy (cr3);
  83     cairo_destroy (cr2);
  84
  85     /* And doesn't affect anything after this cairo_t is destroyed */
  86
  87     cairo_set_source_rgb (cr, 1, 1, 1); /* White */
  88     cairo_rectangle (cr,
  89                      BORDER,     BORDER,
  90                      LINE_WIDTH, SIZE - 2 * BORDER);
  91     cairo_fill (cr);
  92
  93     return CAIRO_TEST_SUCCESS;
  94
  95 }
  96
  97 int
  98 main (void)
  99 {
 100     return cairo_test (&test);
 101 }