test/pixman-rotate.c

   1 /*
   2  * Copyright © 2007 Red Hat, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  * Author: Kristian Høgsberg <krh@redhat.com>
  25  */
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <math.h>
  31
  32 #include <cairo.h>
  33
  34 #include "cairo-test.h"
  35
  36 #define WIDTH   32
  37 #define HEIGHT  WIDTH
  38
  39 #define IMAGE_WIDTH     (3 * WIDTH)
  40 #define IMAGE_HEIGHT    IMAGE_WIDTH
  41
  42 static cairo_test_draw_function_t draw;
  43
  44 cairo_test_t test = {
  45     "pixman-rotate",
  46     "Exposes pixman off-by-one error when rotating",
  47     IMAGE_WIDTH, IMAGE_HEIGHT,
  48     draw
  49 };
  50
  51 /* Draw the word cairo at NUM_TEXT different angles */
  52 static cairo_test_status_t
  53 draw (cairo_t *cr, int width, int height)
  54 {
  55     cairo_surface_t *stamp;
  56     cairo_t *cr2;
  57
  58     stamp = cairo_surface_create_similar (cairo_get_group_target (cr),
  59                                           CAIRO_CONTENT_COLOR_ALPHA,
  60                                           WIDTH, HEIGHT);
  61     cr2 = cairo_create (stamp);
  62     {
  63         cairo_new_path (cr2);
  64         cairo_rectangle (cr2, WIDTH / 4, HEIGHT / 4, WIDTH / 2, HEIGHT / 2);
  65         cairo_set_source_rgba (cr2, 1, 0, 0, 0.8);
  66         cairo_fill (cr2);
  67
  68         cairo_rectangle (cr2, 0, 0, WIDTH, HEIGHT);
  69         cairo_set_line_width (cr2, 2);
  70         cairo_set_source_rgb (cr2, 0, 0, 0);
  71         cairo_stroke (cr2);
  72     }
  73     cairo_destroy (cr2);
  74
  75     /* Draw a translucent rectangle for reference where the rotated
  76      * image should be. */
  77     cairo_new_path (cr);
  78     cairo_rectangle (cr, WIDTH, HEIGHT, WIDTH, HEIGHT);
  79     cairo_set_source_rgba (cr, 1, 1, 0, 0.3);
  80     cairo_fill (cr);
  81
  82 #if 1 /* Set to 0 to generate reference image */
  83     cairo_translate (cr, 2 * WIDTH, 2 * HEIGHT);
  84     cairo_rotate (cr, M_PI);
  85 #else
  86     cairo_translate (cr, WIDTH, HEIGHT);
  87 #endif
  88
  89     cairo_set_source_surface (cr, stamp, 0, 0);
  90     cairo_paint (cr);
  91
  92     cairo_surface_destroy (stamp);
  93
  94     return CAIRO_TEST_SUCCESS;
  95 }
  96
  97 int
  98 main (void)
  99 {
 100     return cairo_test (&test);
 101 }