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core: add font_box function, closes #2495 While here, add an example of usage.
author David Demelier <markand@malikania.fr>
date Wed, 14 Oct 2020 16:40:34 +0200
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children c577c15df07f
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143:4f4795cba52f 144:28d9bb62fcb1
1 /*
2 * example-font.c -- show how to use fonts
3 *
4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <core/clock.h>
20 #include <core/event.h>
21 #include <core/font.h>
22 #include <core/painter.h>
23 #include <core/panic.h>
24 #include <core/sys.h>
25 #include <core/texture.h>
26 #include <core/theme.h>
27 #include <core/util.h>
28 #include <core/window.h>
29
30 #define W (1280)
31 #define H (720)
32
33 /* Friendly taken from: https://lospec.com/palette-list/apollo */
34 static const unsigned long colors[] = {
35 0x3c5e8bff, /* Blue. */
36 0x468232ff, /* Green. */
37 0xad7757ff, /* Light brown. */
38 0x884b2bff, /* Brown. */
39 0x752438ff, /* Red. */
40 0x7a367bff, /* Magenta. */
41 0x151d28ff, /* Dark */
42 0xc7cfccff, /* Christian Grey. */
43 };
44
45 static void
46 init(void)
47 {
48 if (!sys_init() ||
49 !window_init("Example - Font", W, H) ||
50 !theme_init())
51 panic();
52 }
53
54 static void
55 run(void)
56 {
57 struct clock clock = {0};
58 struct font *font = theme_default()->fonts[THEME_FONT_INTERFACE];
59 int ci = 0;
60 enum font_style style = font->style;
61
62 clock_start(&clock);
63
64 for (;;) {
65 struct texture tex;
66 union event ev;
67 unsigned int elapsed = clock_elapsed(&clock);
68
69 clock_start(&clock);
70
71 while (event_poll(&ev)) {
72 switch (ev.type) {
73 case EVENT_KEYDOWN:
74 switch (ev.key.key) {
75 case KEY_LEFT:
76 if (ci > 0)
77 ci--;
78 break;
79 case KEY_RIGHT:
80 if ((size_t)ci < NELEM(colors))
81 ci++;
82 break;
83 case KEY_SPACE:
84 if (style == FONT_STYLE_ANTIALIASED)
85 style = FONT_STYLE_NONE;
86 else
87 style = FONT_STYLE_ANTIALIASED;
88 default:
89 break;
90 }
91 break;
92 case EVENT_QUIT:
93 return;
94 default:
95 break;
96 }
97 }
98
99 painter_set_color(0xffffffff);
100 painter_clear();
101
102 font->color = colors[ci];
103 font->style = style;
104
105 if (!font_render(font, &tex, "Example of text. Use <Left>/<Right> to change color and <Space> to toggle antialiasing."))
106 panic();
107
108 texture_draw(&tex, 10, 10);
109 painter_present();
110 texture_finish(&tex);
111
112 if ((elapsed = clock_elapsed(&clock)) < 20)
113 delay(20 - elapsed);
114 }
115 }
116
117 static void
118 quit(void)
119 {
120 theme_finish();
121 window_finish();
122 sys_finish();
123 }
124
125 int
126 main(int argc, char **argv)
127 {
128 (void)argc;
129 (void)argv;
130
131 init();
132 run();
133 quit();
134
135 return 0;
136 }