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 * Authors: Owen Taylor <otaylor@redhat.com>
24 * Kristian Høgsberg <krh@redhat.com>
25 */
26
27 #include "cairo-test.h"
28 #include <math.h>
29 #include <stdio.h>
30
31 #define WIDTH 16
32 #define HEIGHT 16
33 #define PAD 2
34
35 static const char *png_filename = "romedalen.png";
36 static cairo_surface_t *image;
37
38 static void
set_solid_pattern(const cairo_test_context_t * ctx,cairo_t * cr,int x,int y)39 set_solid_pattern (const cairo_test_context_t *ctx, cairo_t *cr, int x, int y)
40 {
41 cairo_set_source_rgb (cr, 0, 0, 0.6);
42 }
43
44 static void
set_translucent_pattern(const cairo_test_context_t * ctx,cairo_t * cr,int x,int y)45 set_translucent_pattern (const cairo_test_context_t *ctx, cairo_t *cr, int x, int y)
46 {
47 cairo_set_source_rgba (cr, 0, 0, 0.6, 0.5);
48 }
49
50 static void
set_gradient_pattern(const cairo_test_context_t * ctx,cairo_t * cr,int x,int y)51 set_gradient_pattern (const cairo_test_context_t *ctx, cairo_t *cr, int x, int y)
52 {
53 cairo_pattern_t *pattern;
54
55 pattern =
56 cairo_pattern_create_linear (x, y, x + WIDTH, y + HEIGHT);
57 cairo_pattern_add_color_stop_rgba (pattern, 0, 1, 1, 1, 1);
58 cairo_pattern_add_color_stop_rgba (pattern, 1, 0, 0, 0.4, 1);
59 cairo_set_source (cr, pattern);
60 cairo_pattern_destroy (pattern);
61 }
62
63 static void
set_image_pattern(const cairo_test_context_t * ctx,cairo_t * cr,int x,int y)64 set_image_pattern (const cairo_test_context_t *ctx, cairo_t *cr, int x, int y)
65 {
66 cairo_pattern_t *pattern;
67
68 if (image == NULL || cairo_surface_status (image)) {
69 cairo_surface_destroy (image);
70 image = cairo_test_create_surface_from_png (ctx, png_filename);
71 }
72
73 pattern = cairo_pattern_create_for_surface (image);
74 cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
75 cairo_set_source (cr, pattern);
76 cairo_pattern_destroy (pattern);
77 }
78
79 static void
mask_polygon(cairo_t * cr,int x,int y)80 mask_polygon (cairo_t *cr, int x, int y)
81 {
82 cairo_surface_t *mask_surface;
83 cairo_t *cr2;
84
85 mask_surface = cairo_surface_create_similar (cairo_get_group_target (cr),
86 CAIRO_CONTENT_ALPHA,
87 WIDTH, HEIGHT);
88 cr2 = cairo_create (mask_surface);
89 cairo_surface_destroy (mask_surface);
90
91 cairo_save (cr2);
92 cairo_set_operator (cr2, CAIRO_OPERATOR_CLEAR);
93 cairo_paint (cr2);
94 cairo_restore (cr2);
95
96 cairo_set_source_rgb (cr2, 1, 1, 1); /* white */
97
98 cairo_new_path (cr2);
99 cairo_move_to (cr2, 0, 0);
100 cairo_line_to (cr2, 0, HEIGHT);
101 cairo_line_to (cr2, WIDTH / 2, 3 * HEIGHT / 4);
102 cairo_line_to (cr2, WIDTH, HEIGHT);
103 cairo_line_to (cr2, WIDTH, 0);
104 cairo_line_to (cr2, WIDTH / 2, HEIGHT / 4);
105 cairo_close_path (cr2);
106 cairo_fill (cr2);
107
108 cairo_mask_surface (cr, cairo_get_target (cr2), x, y);
109 cairo_destroy (cr2);
110 }
111
112 static void
mask_alpha(cairo_t * cr,int x,int y)113 mask_alpha (cairo_t *cr, int x, int y)
114 {
115 cairo_paint_with_alpha (cr, 0.75);
116 }
117
118 static void
mask_gradient(cairo_t * cr,int x,int y)119 mask_gradient (cairo_t *cr, int x, int y)
120 {
121 cairo_pattern_t *pattern;
122
123 pattern = cairo_pattern_create_linear (x, y,
124 x + WIDTH, y + HEIGHT);
125
126 cairo_pattern_add_color_stop_rgba (pattern,
127 0,
128 1, 1, 1, 1);
129 cairo_pattern_add_color_stop_rgba (pattern,
130 1,
131 1, 1, 1, 0);
132
133 cairo_mask (cr, pattern);
134
135 cairo_pattern_destroy (pattern);
136 }
137
138 static void
clip_none(cairo_t * cr,int x,int y)139 clip_none (cairo_t *cr, int x, int y)
140 {
141 }
142
143 static void
clip_rects(cairo_t * cr,int x,int y)144 clip_rects (cairo_t *cr, int x, int y)
145 {
146 int height = HEIGHT / 3;
147
148 cairo_new_path (cr);
149 cairo_rectangle (cr, x, y, WIDTH, height);
150 cairo_rectangle (cr, x, y + 2 * height, WIDTH, height);
151 cairo_clip (cr);
152 }
153
154 static void
clip_circle(cairo_t * cr,int x,int y)155 clip_circle (cairo_t *cr, int x, int y)
156 {
157 cairo_new_path (cr);
158 cairo_arc (cr, x + WIDTH / 2, y + HEIGHT / 2,
159 WIDTH / 2, 0, 2 * M_PI);
160 cairo_clip (cr);
161 cairo_new_path (cr);
162 }
163
164 static void (* const pattern_funcs[])(const cairo_test_context_t *ctx, cairo_t *cr, int x, int y) = {
165 set_solid_pattern,
166 set_translucent_pattern,
167 set_gradient_pattern,
168 set_image_pattern,
169 };
170
171 static void (* const mask_funcs[])(cairo_t *cr, int x, int y) = {
172 mask_alpha,
173 mask_gradient,
174 mask_polygon,
175 };
176
177 static void (* const clip_funcs[])(cairo_t *cr, int x, int y) = {
178 clip_none,
179 clip_rects,
180 clip_circle,
181 };
182
183 #define IMAGE_WIDTH (ARRAY_LENGTH (pattern_funcs) * (WIDTH + PAD) + PAD)
184 #define IMAGE_HEIGHT (ARRAY_LENGTH (mask_funcs) * ARRAY_LENGTH (clip_funcs) * (HEIGHT + PAD) + PAD)
185
186 static cairo_test_status_t
draw(cairo_t * cr,int width,int height)187 draw (cairo_t *cr, int width, int height)
188 {
189 const cairo_test_context_t *ctx = cairo_test_get_context (cr);
190 cairo_surface_t *tmp_surface;
191 size_t i, j, k;
192 cairo_t *cr2;
193
194 /* Some of our drawing is unbounded, so we draw each test to
195 * a temporary surface and copy over.
196 */
197 tmp_surface = cairo_surface_create_similar (cairo_get_group_target (cr),
198 CAIRO_CONTENT_COLOR_ALPHA,
199 IMAGE_WIDTH, IMAGE_HEIGHT);
200 cr2 = cairo_create (tmp_surface);
201 cairo_surface_destroy (tmp_surface);
202
203 for (k = 0; k < ARRAY_LENGTH (clip_funcs); k++) {
204 for (j = 0; j < ARRAY_LENGTH (mask_funcs); j++) {
205 for (i = 0; i < ARRAY_LENGTH (pattern_funcs); i++) {
206 int x = i * (WIDTH + PAD) + PAD;
207 int y = (ARRAY_LENGTH (mask_funcs) * k + j) * (HEIGHT + PAD) + PAD;
208
209 /* Clear intermediate surface we are going to be drawing onto */
210 cairo_save (cr2);
211 cairo_set_operator (cr2, CAIRO_OPERATOR_CLEAR);
212 cairo_paint (cr2);
213 cairo_restore (cr2);
214
215 /* draw */
216 cairo_save (cr2);
217
218 clip_funcs[k] (cr2, x, y);
219 pattern_funcs[i] (ctx, cr2, x, y);
220 mask_funcs[j] (cr2, x, y);
221
222 cairo_restore (cr2);
223
224 /* Copy back to the main pixmap */
225 cairo_set_source_surface (cr, cairo_get_target (cr2), 0, 0);
226 cairo_rectangle (cr, x, y, WIDTH, HEIGHT);
227 cairo_fill (cr);
228 }
229 }
230 }
231
232 cairo_destroy (cr2);
233
234 cairo_surface_destroy (image);
235 image = NULL;
236
237 return CAIRO_TEST_SUCCESS;
238 }
239
240 CAIRO_TEST (mask,
241 "Tests of cairo_mask",
242 "mask", /* keywords */
243 NULL, /* requirements */
244 IMAGE_WIDTH, IMAGE_HEIGHT,
245 NULL, draw)
246
247