1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <unistd.h>
18#include <stdlib.h>
19#include <limits.h>
20#include <time.h>
21#include <linux/input.h>
22
23#include <functional>
24
25#include <cutils/klog.h>
26#include <minui/minui.h>
27#include <utils/SystemClock.h>
28
29#define NEXT_TIMEOUT_MS 5000
30#define LAST_TIMEOUT_MS 30000
31
32#define LOGE(x...) do { KLOG_ERROR("slideshow", x); } while (0)
33
34static int input_cb(int fd, unsigned int epevents, int *key_code)
35{
36    struct input_event ev;
37
38    *key_code = -1;
39
40    if (ev_get_input(fd, epevents, &ev)) {
41        return -1;
42    }
43
44    if (ev.type == EV_KEY && ev.value == 1) {
45        *key_code = ev.code;
46    }
47
48    return 0;
49}
50
51static void clear()
52{
53    gr_color(0, 0, 0, 0);
54    gr_clear();
55    gr_flip();
56}
57
58static void draw(const char *resname)
59{
60    GRSurface* surface;
61    int w, h, x, y;
62
63    if (res_create_display_surface(resname, &surface) < 0) {
64        LOGE("failed to create surface for %s\n", resname);
65        return;
66    }
67
68    w = gr_get_width(surface);
69    h = gr_get_height(surface);
70    x = (gr_fb_width() - w) / 2;
71    y = (gr_fb_height() - h) / 2;
72
73    gr_blit(surface, 0, 0, w, h, x, y);
74    gr_flip();
75
76    res_free_surface(surface);
77}
78
79int usage()
80{
81    LOGE("usage: slideshow [-t timeout] image.png [image2.png ...] last.png\n");
82    return EXIT_FAILURE;
83}
84
85int main(int argc, char **argv)
86{
87    int key_code = -1;
88    int input = false;
89    int opt;
90    long int timeout = NEXT_TIMEOUT_MS;
91    int64_t start;
92
93    while ((opt = getopt(argc, argv, "t:")) != -1) {
94        switch (opt) {
95        case 't':
96            timeout = strtol(optarg, NULL, 0);
97
98            if (timeout < 0 || timeout >= LONG_MAX) {
99                timeout = NEXT_TIMEOUT_MS;
100                LOGE("invalid timeout %s, defaulting to %ld\n", optarg,
101                    timeout);
102            }
103            break;
104        default:
105            return usage();
106        }
107    }
108
109    if (optind >= argc) {
110        return usage();
111    }
112
113    if (gr_init() == -1 || ev_init(std::bind(&input_cb, std::placeholders::_1,
114                                             std::placeholders::_2, &key_code)) == -1) {
115        LOGE("failed to initialize minui\n");
116        return EXIT_FAILURE;
117    }
118
119    /* display all images except the last one, switch to next image after
120     * timeout or user input */
121
122    while (optind < argc - 1) {
123        draw(argv[optind++]);
124
125        start = android::uptimeMillis();
126        long int timeout_remaining = timeout;
127        do {
128            if (ev_wait(timeout_remaining) == 0) {
129                ev_dispatch();
130
131                if (key_code != -1) {
132                    input = true;
133                    break;
134                }
135            }
136            timeout_remaining -= android::uptimeMillis() - start;
137        } while (timeout_remaining > 0);
138    };
139
140    /* if there was user input while showing the images, display the last
141     * image and wait until the power button is pressed or LAST_TIMEOUT_MS
142     * has elapsed */
143
144    if (input) {
145        start = android::uptimeMillis();
146
147        draw(argv[optind]);
148
149        do {
150            if (ev_wait(timeout) == 0) {
151                ev_dispatch();
152            }
153
154            if (android::uptimeMillis() - start >= LAST_TIMEOUT_MS) {
155                break;
156            }
157        } while (key_code != KEY_POWER);
158    }
159
160    clear();
161    gr_exit();
162    ev_exit();
163
164    return EXIT_SUCCESS;
165}
166