test/surface-pattern-big-scale-down.c

   1 /*
   2  * Copyright © 2006 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 "cairo-test.h"
  27
  28 static cairo_test_draw_function_t draw;
  29
  30 #define SRC_WIDTH 2048
  31 #define SRC_HEIGHT 32
  32
  33 cairo_test_t test = {
  34     "surface-pattern-big-scale-down",
  35     "Test scaled-down transformed not-repeated surface patterns with large images and offsets",
  36     512, 16,
  37     draw
  38 };
  39
  40 static void
  41 setup_source_surface (cairo_surface_t *surface, int w, int h)
  42 {
  43   cairo_t *cr = cairo_create (surface);
  44
  45   cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
  46   cairo_rectangle (cr, 0, 0, w/2, h/2);
  47   cairo_fill (cr);
  48
  49   cairo_set_source_rgb (cr, 0.0, 1.0, 0.0);
  50   cairo_rectangle (cr, w/2, 0, w/2, h/2);
  51   cairo_fill (cr);
  52
  53   cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
  54   cairo_rectangle (cr, 0, h/2, w/2, h/2);
  55   cairo_fill (cr);
  56
  57   cairo_set_source_rgb (cr, 1.0, 1.0, 0.0);
  58   cairo_rectangle (cr, w/2, h/2, w/2, h/2);
  59   cairo_fill (cr);
  60
  61   cairo_destroy (cr);
  62 }
  63
  64 static void
  65 draw_n (cairo_t *cr, cairo_pattern_t *pat, double dest_size, int n)
  66 {
  67   cairo_matrix_t mat;
  68
  69   cairo_matrix_init_scale (&mat, SRC_WIDTH / dest_size, SRC_HEIGHT / dest_size);
  70   cairo_matrix_translate (&mat, n * -dest_size, 0.0);
  71   cairo_pattern_set_matrix (pat, &mat);
  72
  73   cairo_set_source (cr, pat);
  74   cairo_new_path (cr);
  75   cairo_rectangle (cr, n * dest_size, 0.0, dest_size, dest_size);
  76   cairo_fill (cr);
  77 }
  78
  79 static cairo_test_status_t
  80 draw (cairo_t *cr, int width, int height)
  81 {
  82     cairo_surface_t *surface;
  83     cairo_pattern_t *pat;
  84
  85     cairo_set_source_rgb (cr, 0, 0, 0);
  86     cairo_paint (cr);
  87
  88     surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, SRC_WIDTH, SRC_HEIGHT);
  89     setup_source_surface (surface, SRC_WIDTH, SRC_HEIGHT);
  90
  91     pat = cairo_pattern_create_for_surface (surface);
  92     cairo_surface_destroy (surface);
  93
  94     /* We want to draw at a position such that n * SRC_WIDTH * (SRC_WIDTH/16.0) > 32768.
  95      * x = n * 16.
  96      *
  97      * To show the bug, we want to draw on either side of the boundary;
  98      * in our case here, n = 16 results in 32768, and n = 17 results in > 32768.
  99      *
 100      * Drawing at 16 and 17 is sufficient to show the problem.
 101      */
 102
 103 #if 1
 104     /* n = 16 */
 105     draw_n (cr, pat, 16.0, 16);
 106
 107     /* n = 17 */
 108     draw_n (cr, pat, 16.0, 17);
 109 #else
 110     {
 111         int n;
 112         for (n = 0; n < 32; n++)
 113             draw_n (cr, pat, 16.0, n);
 114     }
 115 #endif
 116
 117     cairo_pattern_destroy (pat);
 118
 119     return CAIRO_TEST_SUCCESS;
 120 }
 121
 122 int
 123 main (void)
 124 {
 125     return cairo_test (&test);
 126 }