test/source-clip-scale.c

   1 /*
   2  * Copyright © 2005 Mozilla Corporation
   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  * Mozilla Corporation not be used in advertising or publicity pertaining to
  10  * distribution of the software without specific, written prior
  11  * permission. Mozilla Corporation 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  * MOZILLA CORPORATION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL MOZILLA CORPORATION 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: Vladimir Vukicevic <vladimir@pobox.com>
  24  */
  25
  26 #include <math.h>
  27 #include "cairo-test.h"
  28 #include <stdio.h>
  29
  30 #define SIZE 12
  31
  32 static cairo_test_draw_function_t draw;
  33
  34 cairo_test_t test = {
  35     "source-clip-scale",
  36     "Test that a source surface is not affected by a clip when scaling",
  37     SIZE * 2, SIZE,
  38     draw
  39 };
  40
  41 static cairo_test_status_t
  42 draw (cairo_t *cr, int width, int height)
  43 {
  44     cairo_surface_t *source;
  45     cairo_t *cr2;
  46
  47     source = cairo_surface_create_similar (cairo_get_group_target (cr),
  48                                            CAIRO_CONTENT_COLOR_ALPHA,
  49                                            SIZE, SIZE);
  50     cr2 = cairo_create (source);
  51
  52     /* Fill the source surface with green */
  53     cairo_set_source_rgb (cr2, 0, 1, 0);
  54     cairo_paint (cr2);
  55
  56     /* Draw a blue square in the middle of the source with clipping.
  57      * Note that we are only clipping within a save/restore block but
  58      * the buggy behavior demonstrates that the clip remains present
  59      * on the surface. */
  60     cairo_save (cr2);
  61     cairo_rectangle (cr2,
  62                      SIZE / 4, SIZE / 4,
  63                      SIZE / 2, SIZE / 2);
  64     cairo_clip (cr2);
  65     cairo_set_source_rgb (cr2, 0, 0, 1);
  66     cairo_paint (cr2);
  67     cairo_restore (cr2);
  68
  69     /* Fill the destination surface with solid red (should not appear
  70      * in final result) */
  71     cairo_set_source_rgb (cr, 1, 0, 0);
  72     cairo_paint (cr);
  73
  74     /* Now draw the source surface onto the destination with scaling. */
  75     cairo_scale (cr, 2.0, 1.0);
  76
  77     cairo_set_source_surface (cr, source, 0, 0);
  78     cairo_paint (cr);
  79
  80     cairo_destroy (cr2);
  81     cairo_surface_destroy (source);
  82
  83     return CAIRO_TEST_SUCCESS;
  84 }
  85
  86 int
  87 main (void)
  88 {
  89     return cairo_test (&test);
  90 }