clients/screenshot.c

   1 /*
   2  * Copyright © 2008 Kristian Høgsberg
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that copyright
   7  * notice and this permission notice appear in supporting documentation, and
   8  * that the name of the copyright holders not be used in advertising or
   9  * publicity pertaining to distribution of the software without specific,
  10  * written prior permission.  The copyright holders make no representations
  11  * about the suitability of this software for any purpose.  It is provided "as
  12  * is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  20  * OF THIS SOFTWARE.
  21  */
  22
  23 #include <stdint.h>
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29 #include <sys/mman.h>
  30 #include <cairo.h>
  31
  32 #include <wayland-client.h>
  33 #include "screenshooter-client-protocol.h"
  34
  35 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
  36
  37 /* The screenshooter is a good example of a custom object exposed by
  38  * the compositor and serves as a test bed for implementing client
  39  * side marshalling outside libwayland.so */
  40
  41 static struct wl_shm *shm;
  42 static struct screenshooter *screenshooter;
  43 static struct wl_list output_list;
  44 int buffer_copy_done;
  45
  46 struct screenshooter_output {
  47         struct wl_output *output;
  48         struct wl_buffer *buffer;
  49         int width, height, offset_x, offset_y;
  50         struct wl_list link;
  51 };
  52
  53 static void
  54 display_handle_geometry(void *data,
  55                         struct wl_output *wl_output,
  56                         int x,
  57                         int y,
  58                         int physical_width,
  59                         int physical_height,
  60                         int subpixel,
  61                         const char *make,
  62                         const char *model)
  63 {
  64         struct screenshooter_output *output;
  65
  66         output = wl_output_get_user_data(wl_output);
  67
  68         if (wl_output == output->output) {
  69                 output->offset_x = x;
  70                 output->offset_y = y;
  71         }
  72 }
  73
  74 static void
  75 display_handle_mode(void *data,
  76                     struct wl_output *wl_output,
  77                     uint32_t flags,
  78                     int width,
  79                     int height,
  80                     int refresh)
  81 {
  82         struct screenshooter_output *output;
  83
  84         output = wl_output_get_user_data(wl_output);
  85
  86         if (wl_output == output->output && (flags & WL_OUTPUT_MODE_CURRENT)) {
  87                 output->width = width;
  88                 output->height = height;
  89         }
  90 }
  91
  92 static const struct wl_output_listener output_listener = {
  93         display_handle_geometry,
  94         display_handle_mode
  95 };
  96
  97 static void
  98 screenshot_done(void *data, struct screenshooter *screenshooter)
  99 {
 100         buffer_copy_done = 1;
 101 }
 102
 103 static const struct screenshooter_listener screenshooter_listener = {
 104         screenshot_done
 105 };
 106
 107 static void
 108 handle_global(struct wl_display *display, uint32_t id,
 109               const char *interface, uint32_t version, void *data)
 110 {
 111         static struct screenshooter_output *output;
 112
 113         if (strcmp(interface, "wl_output") == 0) {
 114                 output = malloc(sizeof *output);
 115                 output->output = wl_display_bind(display, id, &wl_output_interface);
 116                 wl_list_insert(&output_list, &output->link);
 117                 wl_output_add_listener(output->output, &output_listener, output);
 118         } else if (strcmp(interface, "wl_shm") == 0) {
 119                 shm = wl_display_bind(display, id, &wl_shm_interface);
 120         } else if (strcmp(interface, "screenshooter") == 0) {
 121                 screenshooter = wl_display_bind(display, id, &screenshooter_interface);
 122         }
 123 }
 124
 125 static struct wl_buffer *
 126 create_shm_buffer(int width, int height, void **data_out)
 127 {
 128         char filename[] = "/tmp/wayland-shm-XXXXXX";
 129         struct wl_shm_pool *pool;
 130         struct wl_buffer *buffer;
 131         int fd, size, stride;
 132         void *data;
 133
 134         fd = mkstemp(filename);
 135         if (fd < 0) {
 136                 fprintf(stderr, "open %s failed: %m\n", filename);
 137                 return NULL;
 138         }
 139         stride = width * 4;
 140         size = stride * height;
 141         if (ftruncate(fd, size) < 0) {
 142                 fprintf(stderr, "ftruncate failed: %m\n");
 143                 close(fd);
 144                 return NULL;
 145         }
 146
 147         data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 148         unlink(filename);
 149
 150         if (data == MAP_FAILED) {
 151                 fprintf(stderr, "mmap failed: %m\n");
 152                 close(fd);
 153                 return NULL;
 154         }
 155
 156         pool = wl_shm_create_pool(shm, fd, size);
 157         close(fd);
 158         buffer = wl_shm_pool_create_buffer(pool, 0, width, height, stride,
 159                                            WL_SHM_FORMAT_XRGB8888);
 160         wl_shm_pool_destroy(pool);
 161
 162         *data_out = data;
 163
 164         return buffer;
 165 }
 166
 167 static void
 168 write_png(int width, int height, void *data)
 169 {
 170         cairo_surface_t *surface;
 171
 172         surface = cairo_image_surface_create_for_data(data,
 173                                                       CAIRO_FORMAT_ARGB32,
 174                                                       width, height, width * 4);
 175         cairo_surface_write_to_png(surface, "wayland-screenshot.png");
 176         cairo_surface_destroy(surface);
 177 }
 178
 179 int main(int argc, char *argv[])
 180 {
 181         struct wl_display *display;
 182         struct wl_buffer *buffer;
 183         void *data = NULL;
 184         struct screenshooter_output *output, *next;
 185         int width = 0, height = 0;
 186
 187         display = wl_display_connect(NULL);
 188         if (display == NULL) {
 189                 fprintf(stderr, "failed to create display: %m\n");
 190                 return -1;
 191         }
 192
 193         wl_list_init(&output_list);
 194         wl_display_add_global_listener(display, handle_global, &screenshooter);
 195         wl_display_iterate(display, WL_DISPLAY_READABLE);
 196         wl_display_roundtrip(display);
 197         if (screenshooter == NULL) {
 198                 fprintf(stderr, "display doesn't support screenshooter\n");
 199                 return -1;
 200         }
 201
 202         screenshooter_add_listener(screenshooter, &screenshooter_listener, screenshooter);
 203
 204
 205         wl_list_for_each(output, &output_list, link) {
 206                 width = MAX(width, output->offset_x + output->width);
 207                 height = MAX(height, output->offset_y + output->height);
 208         }
 209
 210         buffer = create_shm_buffer(width, height, &data);
 211
 212         wl_list_for_each_safe(output, next, &output_list, link) {
 213                 screenshooter_shoot(screenshooter, output->output, buffer);
 214                 buffer_copy_done = 0;
 215                 while (!buffer_copy_done)
 216                         wl_display_roundtrip(display);
 217                 free(output);
 218         }
 219
 220         write_png(width, height, data);
 221
 222         return 0;
 223 }