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comparison libadventure/adventure/trace_hud.c @ 141:4eeeccf2b732

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core: add trace/vtrace functions, closes #2493
author David Demelier <markand@malikania.fr>
date Wed, 14 Oct 2020 10:29:53 +0200
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children 7f1af54bb35a
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140:453651d76f7c 141:4eeeccf2b732
1 /*
2 * trace_hud.c -- on screen hud
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 <assert.h>
20 #include <stdio.h>
21 #include <string.h>
22
23 #include <core/label.h>
24 #include <core/font.h>
25 #include <core/theme.h>
26 #include <core/trace.h>
27
28 #include "trace_hud.h"
29
30 #define LINES_MAX (4)
31 #define THEME(t) ((t) ? (t) : theme_default())
32
33 static struct {
34 char lines[LINES_MAX + 1][TRACE_LINE_MAX];
35 unsigned int elapsed;
36 } data;
37
38 struct trace_hud trace_hud = {
39 .timeout = TRACE_HUD_TIMEOUT_DEFAULT
40 };
41
42 void
43 trace_hud_handler(const char *str)
44 {
45 assert(str);
46
47 /* 1.Try to find an empty line. */
48 for (size_t i = 0; i < LINES_MAX; ++i) {
49 if (data.lines[i][0] == '\0') {
50 snprintf(data.lines[i], sizeof (data.lines[i]), "%s", str);
51 return;
52 }
53 }
54
55 /* 2. All lines are full, put in last one and move other. */
56 memmove(&data.lines[0], &data.lines[1], sizeof (data.lines[0]) * LINES_MAX - 1);
57 snprintf(data.lines[LINES_MAX - 1], sizeof (data.lines[0]), "%s", str);
58
59 /* 3. Reset elapsed time now. */
60 data.elapsed = 0;
61 }
62
63 void
64 trace_hud_update(unsigned int ticks)
65 {
66 data.elapsed += ticks;
67
68 /*
69 * We have an empty line in the data.lines at LINES_MAX, so we simply so
70 * to move the whole array.
71 *
72 * [0] = "abc"
73 * [1] = "def"
74 * [2] = "xyz"
75 * [3] = "zef"
76 * [n] = "ldkf"
77 * [LINES_MAX + 1] = "\0"
78 */
79 if (data.elapsed >= trace_hud.timeout) {
80 data.elapsed = 0;
81 memmove(&data.lines[0], &data.lines[1], sizeof (data.lines[0]) * LINES_MAX);
82 }
83 }
84
85 void
86 trace_hud_draw(void)
87 {
88 struct theme *th;
89 int x, y;
90
91 th = THEME(trace_hud.theme);
92 x = th->padding;
93 y = th->padding;
94
95 for (int i = 0; i < LINES_MAX && data.lines[i][0]; ++i) {
96 label_draw(&(struct label) {
97 .x = x,
98 .y = y,
99 .text = data.lines[i],
100 .theme = th,
101 .flags = LABEL_NO_HCENTER
102 });
103
104 y += font_height(th->fonts[THEME_FONT_INTERFACE]);
105 y += th->padding;
106 }
107 }
108
109 void
110 trace_hud_clear(void)
111 {
112 memset(&data, 0, sizeof (data));
113 }