cairo/test/mask-transformed-image.c

   1 /*
   2  * Copyright 2008 Kai-Uwe Behrmann
   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  * Kai-Uwe Behrmann not be used in advertising or publicity pertaining to
  10  * distribution of the software without specific, written prior
  11  * permission. Kai-Uwe Behrmann 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  * KAI_UWE BEHRMANN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL KAI_UWE BEHRMANN 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: Kai-Uwe Behrmann <ku.b@gmx.de>
  24  *         Chris Wilson <chris@chris-wilson.co.uk>
  25  */
  26
  27 #include "cairo-test.h"
  28
  29 static cairo_test_draw_function_t draw;
  30 static const char png_filename[] = "romedalen.png";
  31
  32 static const cairo_test_t test = {
  33     "mask-transformed-image",
  34     "Test that cairo_mask() is affected properly by the CTM and not the image",
  35     80, 80,
  36     draw
  37 };
  38
  39 static cairo_surface_t *
  40 create_mask (cairo_t *dst, int width, int height)
  41 {
  42     cairo_surface_t *mask;
  43     cairo_t *cr;
  44
  45     mask = cairo_image_surface_create (CAIRO_FORMAT_A8, width, height);
  46     cr = cairo_create (mask);
  47     cairo_surface_destroy (mask);
  48
  49     cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
  50     cairo_rectangle (cr, width/4, height/4, width/2, height/2);
  51     cairo_fill (cr);
  52
  53     mask = cairo_surface_reference (cairo_get_target (cr));
  54     cairo_destroy (cr);
  55
  56     return mask;
  57 }
  58
  59 static cairo_test_status_t
  60 draw (cairo_t *cr, int width, int height)
  61 {
  62     const cairo_test_context_t *ctx = cairo_test_get_context (cr);
  63     cairo_surface_t *image, *mask;
  64
  65     image = cairo_test_create_surface_from_png (ctx, png_filename);
  66     mask = create_mask (cr, 40, 40);
  67
  68     /* opaque background */
  69     cairo_paint (cr);
  70
  71     /* center */
  72     cairo_translate (cr,
  73                      (width - cairo_image_surface_get_width (image)) / 2.,
  74                      (height - cairo_image_surface_get_height (image)) / 2.);
  75
  76     /* rotate 30 degree around the center */
  77     cairo_translate (cr, width/2., height/2.);
  78     cairo_rotate (cr, -30 * 2 * M_PI / 360);
  79     cairo_translate (cr, -width/2., -height/2.);
  80
  81     /* place the image on our surface */
  82     cairo_set_source_surface (cr, image, 0, 0);
  83
  84     /* reset the drawing matrix */
  85     cairo_identity_matrix (cr);
  86
  87     /* fill nicely */
  88     cairo_scale (cr, width / 40., height / 40.);
  89
  90     /* apply the mask */
  91     cairo_mask_surface (cr, mask, 0, 0);
  92
  93     cairo_surface_destroy (mask);
  94     cairo_surface_destroy (image);
  95
  96     return CAIRO_TEST_SUCCESS;
  97 }
  98
  99 int
 100 main (void)
 101 {
 102     return cairo_test (&test);
 103 }