cairo/test/clip-operator.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: Kristian Høgsberg <krh@redhat.com>
  24  */
  25
  26 #include <math.h>
  27 #include "cairo-test.h"
  28 #include <stdio.h>
  29
  30 #define WIDTH 16
  31 #define HEIGHT 16
  32 #define PAD 2
  33
  34 static void
  35 draw_mask (cairo_t *cr, int x, int y)
  36 {
  37     cairo_surface_t *mask_surface;
  38     cairo_t *cr2;
  39
  40     double width = (int)(0.9 * WIDTH);
  41     double height = (int)(0.9 * HEIGHT);
  42     x += 0.05 * WIDTH;
  43     y += 0.05 * HEIGHT;
  44
  45     mask_surface = cairo_surface_create_similar (cairo_get_group_target (cr),
  46                                                  CAIRO_CONTENT_ALPHA,
  47                                                  width, height);
  48     cr2 = cairo_create (mask_surface);
  49     cairo_surface_destroy (mask_surface);
  50
  51     cairo_save (cr2);
  52     cairo_set_source_rgba (cr2, 0, 0, 0, 0); /* transparent */
  53     cairo_set_operator (cr2, CAIRO_OPERATOR_SOURCE);
  54     cairo_paint (cr2);
  55     cairo_restore (cr2);
  56
  57     cairo_set_source_rgb (cr2, 1, 1, 1); /* white */
  58
  59     cairo_arc (cr2, 0.5 * width, 0.5 * height, 0.45 * height, 0, 2 * M_PI);
  60     cairo_fill (cr2);
  61
  62     cairo_mask_surface (cr, cairo_get_target (cr2), x, y);
  63     cairo_destroy (cr2);
  64 }
  65
  66 static void
  67 draw_glyphs (cairo_t *cr, int x, int y)
  68 {
  69     cairo_text_extents_t extents;
  70
  71     cairo_set_font_size (cr, 0.8 * HEIGHT);
  72
  73     cairo_text_extents (cr, "FG", &extents);
  74     cairo_move_to (cr,
  75                    x + floor ((WIDTH - extents.width) / 2 + 0.5) - extents.x_bearing,
  76                    y + floor ((HEIGHT - extents.height) / 2 + 0.5) - extents.y_bearing);
  77     cairo_show_text (cr, "FG");
  78 }
  79
  80 static void
  81 draw_polygon (cairo_t *cr, int x, int y)
  82 {
  83     double width = (int)(0.9 * WIDTH);
  84     double height = (int)(0.9 * HEIGHT);
  85     x += 0.05 * WIDTH;
  86     y += 0.05 * HEIGHT;
  87
  88     cairo_new_path (cr);
  89     cairo_move_to (cr, x, y);
  90     cairo_line_to (cr, x, y + height);
  91     cairo_line_to (cr, x + width / 2, y + 3 * height / 4);
  92     cairo_line_to (cr, x + width, y + height);
  93     cairo_line_to (cr, x + width, y);
  94     cairo_line_to (cr, x + width / 2, y + height / 4);
  95     cairo_close_path (cr);
  96     cairo_fill (cr);
  97 }
  98
  99 static void
 100 draw_rects (cairo_t *cr, int x, int y)
 101 {
 102     double block_width = (int)(0.33 * WIDTH + 0.5);
 103     double block_height = (int)(0.33 * HEIGHT + 0.5);
 104     int i, j;
 105
 106     for (i = 0; i < 3; i++)
 107         for (j = 0; j < 3; j++)
 108             if ((i + j) % 2 == 0)
 109                 cairo_rectangle (cr,
 110                                  x + block_width * i, y + block_height * j,
 111                                  block_width,         block_height);
 112
 113     cairo_fill (cr);
 114 }
 115
 116 static void (* const draw_funcs[])(cairo_t *cr, int x, int y) = {
 117     draw_mask,
 118     draw_glyphs,
 119     draw_polygon,
 120     draw_rects
 121 };
 122
 123 #define N_OPERATORS (1 + CAIRO_OPERATOR_SATURATE - CAIRO_OPERATOR_CLEAR)
 124
 125 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
 126 #define IMAGE_WIDTH (N_OPERATORS * (WIDTH + PAD) + PAD)
 127 #define IMAGE_HEIGHT (ARRAY_SIZE (draw_funcs) * (HEIGHT + PAD) + PAD)
 128
 129 static cairo_test_draw_function_t draw;
 130
 131 static const cairo_test_t test = {
 132     "clip-operator",
 133     "Surface clipping with different operators",
 134     IMAGE_WIDTH, IMAGE_HEIGHT,
 135     draw
 136 };
 137
 138 static cairo_test_status_t
 139 draw (cairo_t *cr, int width, int height)
 140 {
 141     const cairo_test_context_t *ctx = cairo_test_get_context (cr);
 142     size_t j, x, y;
 143     cairo_operator_t op;
 144     cairo_pattern_t *pattern;
 145
 146     cairo_select_font_face (cr, "Bitstream Vera Sans",
 147                             CAIRO_FONT_SLANT_NORMAL,
 148                             CAIRO_FONT_WEIGHT_NORMAL);
 149     cairo_set_font_size (cr, 0.9 * HEIGHT);
 150
 151     for (j = 0; j < ARRAY_SIZE (draw_funcs); j++) {
 152         for (op = CAIRO_OPERATOR_CLEAR; op < N_OPERATORS; op++) {
 153             x = op * (WIDTH + PAD) + PAD;
 154             y = j * (HEIGHT + PAD) + PAD;
 155
 156             cairo_save (cr);
 157
 158             pattern = cairo_pattern_create_linear (x + WIDTH, y,
 159                                                    x,         y + HEIGHT);
 160             cairo_pattern_add_color_stop_rgba (pattern, 0.2,
 161                                                0.0, 0.0, 1.0, 1.0); /* Solid blue */
 162             cairo_pattern_add_color_stop_rgba (pattern, 0.8,
 163                                                0.0, 0.0, 1.0, 0.0); /* Transparent blue */
 164             cairo_set_source (cr, pattern);
 165             cairo_pattern_destroy (pattern);
 166
 167             cairo_rectangle (cr, x, y, WIDTH, HEIGHT);
 168             cairo_fill (cr);
 169
 170             cairo_set_operator (cr, op);
 171             cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
 172
 173             cairo_move_to (cr, x, y);
 174             cairo_line_to (cr, x + WIDTH, y);
 175             cairo_line_to (cr, x, y + HEIGHT);
 176             cairo_clip (cr);
 177
 178             draw_funcs[j] (cr, x, y);
 179             if (cairo_status (cr))
 180                 cairo_test_log (ctx, "%d %d HERE!\n", op, (int)j);
 181
 182             cairo_restore (cr);
 183         }
 184     }
 185
 186     if (cairo_status (cr) != CAIRO_STATUS_SUCCESS)
 187         cairo_test_log (ctx, "%d %d .HERE!\n", op, (int)j);
 188
 189     return CAIRO_TEST_SUCCESS;
 190 }
 191
 192 int
 193 main (void)
 194 {
 195     return cairo_test (&test);
 196 }