screenshot.c 5.17 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
/*
 * Copyright © 2008 Kristian Høgsberg
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

23
24
25
26
27
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
28
29
#include <unistd.h>
#include <sys/mman.h>
30
#include <glib.h>
31
#include <gdk-pixbuf/gdk-pixbuf.h>
32
33
34

#include "wayland-client.h"
#include "wayland-glib.h"
35
#include "screenshooter-client-protocol.h"
36
37
38
39
40

/* The screenshooter is a good example of a custom object exposed by
 * the compositor and serves as a test bed for implementing client
 * side marshalling outside libwayland.so */

41
42
43
44
45
46
47
48
static struct wl_output *output;
static struct wl_shm *shm;
static struct wl_visual *visual;
static struct screenshooter *screenshooter;
static int output_width, output_height;

static void
display_handle_geometry(void *data,
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
			struct wl_output *wl_output,
			int x,
			int y,
			int physical_width,
			int physical_height,
			int subpixel,
			const char *make,
			const char *model)
{
}

static void
display_handle_mode(void *data,
		    struct wl_output *wl_output,
		    uint32_t flags,
		    int width,
		    int height,
		    int refresh)
67
68
69
70
71
72
73
{
	output_width = width;
	output_height = height;
}

static const struct wl_output_listener output_listener = {
	display_handle_geometry,
74
	display_handle_mode
75
76
};

77
static void
78
79
handle_global(struct wl_display *display, uint32_t id,
	      const char *interface, uint32_t version, void *data)
80
{
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
	static int visual_count;

	if (strcmp(interface, "wl_output") == 0) {
		output = wl_output_create(display, id, 1);
		wl_output_add_listener(output, &output_listener, NULL);
	} else if (strcmp(interface, "wl_shm") == 0) {
		shm = wl_shm_create(display, id, 1);
	} else if (strcmp(interface, "wl_visual") == 0) {
		if  (visual_count++ == 1)
			visual = wl_visual_create(display, id, 1);
	} else if (strcmp(interface, "screenshooter") == 0) {
		screenshooter = screenshooter_create(display, id, 1);
	}
}

static void
sync_callback(void *data)
{
   int *done = data;
100

101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
   *done = 1;
}

static void
roundtrip(struct wl_display *display)
{
	int done;

	done = 0;
	wl_display_sync_callback(display, sync_callback, &done);
	wl_display_iterate(display, WL_DISPLAY_WRITABLE);
	while (!done)
		wl_display_iterate(display, WL_DISPLAY_READABLE);
}

static struct wl_buffer *
create_shm_buffer(int width, int height, void **data_out)
{
	char filename[] = "/tmp/wayland-shm-XXXXXX";
	struct wl_buffer *buffer;
	int fd, size, stride;
	void *data;

	fd = mkstemp(filename);
	if (fd < 0) {
		fprintf(stderr, "open %s failed: %m\n", filename);
		return NULL;
	}
	stride = width * 4;
	size = stride * height;
	if (ftruncate(fd, size) < 0) {
		fprintf(stderr, "ftruncate failed: %m\n");
		close(fd);
		return NULL;
	}

	data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	unlink(filename);

	if (data == MAP_FAILED) {
		fprintf(stderr, "mmap failed: %m\n");
		close(fd);
		return NULL;
	}

	buffer = wl_shm_create_buffer(shm, fd, width, height, stride, visual);

	close(fd);

	*data_out = data;

	return buffer;
153
154
}

155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
static void
write_png(int width, int height, void **data_out) {
	GdkPixbuf *pixbuf, *normal;
	GError *error = NULL;

	g_type_init();
	pixbuf = gdk_pixbuf_new_from_data(*data_out, GDK_COLORSPACE_RGB, TRUE,
		                          8, width, height, width * 4, NULL,
	                                  NULL);

	normal = gdk_pixbuf_flip(pixbuf, FALSE);
	gdk_pixbuf_save(normal, "wayland-screenshot.png", "png", &error, NULL);
	g_object_unref(normal);
	g_object_unref(pixbuf);
}

171
172
173
int main(int argc, char *argv[])
{
	struct wl_display *display;
174
	struct wl_buffer *buffer;
175
	void *data = NULL;
176

177
	display = wl_display_connect(NULL);
178
179
180
181
182
	if (display == NULL) {
		fprintf(stderr, "failed to create display: %m\n");
		return -1;
	}

183
	wl_display_add_global_listener(display, handle_global, &screenshooter);
184
	wl_display_iterate(display, WL_DISPLAY_READABLE);
185
	roundtrip(display);
186
187
188
189
190
	if (screenshooter == NULL) {
		fprintf(stderr, "display doesn't support screenshooter\n");
		return -1;
	}

191
192
193
	buffer = create_shm_buffer(output_width, output_height, &data);
	screenshooter_shoot(screenshooter, output, buffer);
	roundtrip(display);
194

195
	write_png(output_width, output_height, &data);
196
197
198

	return 0;
}