clients/simple-touch.c

   1 /*
   2  * Copyright © 2011 Benjamin Franzke
   3  * Copyright © 2011 Intel Corporation
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software and its
   6  * documentation for any purpose is hereby granted without fee, provided that
   7  * the above copyright notice appear in all copies and that both that copyright
   8  * notice and this permission notice appear in supporting documentation, and
   9  * that the name of the copyright holders not be used in advertising or
  10  * publicity pertaining to distribution of the software without specific,
  11  * written prior permission.  The copyright holders make no representations
  12  * about the suitability of this software for any purpose.  It is provided "as
  13  * is" without express or implied warranty.
  14  *
  15  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  16  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  17  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  18  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  19  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  20  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  21  * OF THIS SOFTWARE.
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdbool.h>
  28 #include <assert.h>
  29 #include <unistd.h>
  30 #include <sys/mman.h>
  31
  32 #include <wayland-client.h>
  33 #include "../shared/os-compatibility.h"
  34
  35 #define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
  36
  37 struct touch {
  38         struct wl_display *display;
  39         struct wl_registry *registry;
  40         struct wl_compositor *compositor;
  41         struct wl_shell *shell;
  42         struct wl_shm *shm;
  43         struct wl_seat *seat;
  44         struct wl_touch *wl_touch;
  45         struct wl_pointer *pointer;
  46         struct wl_keyboard *keyboard;
  47         struct wl_surface *surface;
  48         struct wl_shell_surface *shell_surface;
  49         struct wl_buffer *buffer;
  50         int has_argb;
  51         int width, height;
  52         void *data;
  53 };
  54
  55 static void
  56 create_shm_buffer(struct touch *touch)
  57 {
  58         struct wl_shm_pool *pool;
  59         int fd, size, stride;
  60
  61         stride = touch->width * 4;
  62         size = stride * touch->height;
  63
  64         fd = os_create_anonymous_file(size);
  65         if (fd < 0) {
  66                 fprintf(stderr, "creating a buffer file for %d B failed: %m\n",
  67                         size);
  68                 exit(1);
  69         }
  70
  71         touch->data =
  72                 mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  73         if (touch->data == MAP_FAILED) {
  74                 fprintf(stderr, "mmap failed: %m\n");
  75                 close(fd);
  76                 exit(1);
  77         }
  78
  79         pool = wl_shm_create_pool(touch->shm, fd, size);
  80         touch->buffer =
  81                 wl_shm_pool_create_buffer(pool, 0,
  82                                           touch->width, touch->height, stride,
  83                                           WL_SHM_FORMAT_ARGB8888);
  84         wl_shm_pool_destroy(pool);
  85
  86         close(fd);
  87 }
  88
  89 static void
  90 shm_format(void *data, struct wl_shm *wl_shm, uint32_t format)
  91 {
  92         struct touch *touch = data;
  93
  94         if (format == WL_SHM_FORMAT_ARGB8888)
  95                 touch->has_argb = 1;
  96 }
  97
  98 struct wl_shm_listener shm_listenter = {
  99         shm_format
 100 };
 101
 102
 103 static void
 104 touch_paint(struct touch *touch, int32_t x, int32_t y, int32_t id)
 105 {
 106         uint32_t *p, c;
 107         static const uint32_t colors[] = {
 108                 0xffff0000,
 109                 0xffffff00,
 110                 0xff0000ff,
 111                 0xffff00ff,
 112                 0xff00ff00,
 113                 0xff00ffff,
 114         };
 115
 116         if (id < (int32_t) ARRAY_LENGTH(colors))
 117                 c = colors[id];
 118         else
 119                 c = 0xffffffff;
 120
 121         if (x < 2 || x >= touch->width - 2 ||
 122             y < 2 || y >= touch->height - 2)
 123                 return;
 124
 125         p = (uint32_t *) touch->data + (x - 2) + (y - 2) * touch->width;
 126         p[2] = c;
 127         p += touch->width;
 128         p[1] = c;
 129         p[2] = c;
 130         p[3] = c;
 131         p += touch->width;
 132         p[0] = c;
 133         p[1] = c;
 134         p[2] = c;
 135         p[3] = c;
 136         p[4] = c;
 137         p += touch->width;
 138         p[1] = c;
 139         p[2] = c;
 140         p[3] = c;
 141         p += touch->width;
 142         p[2] = c;
 143
 144         wl_surface_attach(touch->surface, touch->buffer, 0, 0);
 145         wl_surface_damage(touch->surface, x - 2, y - 2, 5, 5);
 146         /* todo: We could queue up more damage before committing, if there
 147          * are more input events to handle.
 148          */
 149         wl_surface_commit(touch->surface);
 150 }
 151
 152 static void
 153 touch_handle_down(void *data, struct wl_touch *wl_touch,
 154                   uint32_t serial, uint32_t time, struct wl_surface *surface,
 155                   int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
 156 {
 157         struct touch *touch = data;
 158         float x = wl_fixed_to_double(x_w);
 159         float y = wl_fixed_to_double(y_w);
 160
 161         touch_paint(touch, x, y, id);
 162 }
 163
 164 static void
 165 touch_handle_up(void *data, struct wl_touch *wl_touch,
 166                 uint32_t serial, uint32_t time, int32_t id)
 167 {
 168 }
 169
 170 static void
 171 touch_handle_motion(void *data, struct wl_touch *wl_touch,
 172                     uint32_t time, int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
 173 {
 174         struct touch *touch = data;
 175         float x = wl_fixed_to_double(x_w);
 176         float y = wl_fixed_to_double(y_w);
 177
 178         touch_paint(touch, x, y, id);
 179 }
 180
 181 static void
 182 touch_handle_frame(void *data, struct wl_touch *wl_touch)
 183 {
 184 }
 185
 186 static void
 187 touch_handle_cancel(void *data, struct wl_touch *wl_touch)
 188 {
 189 }
 190
 191 static const struct wl_touch_listener touch_listener = {
 192         touch_handle_down,
 193         touch_handle_up,
 194         touch_handle_motion,
 195         touch_handle_frame,
 196         touch_handle_cancel,
 197 };
 198
 199 static void
 200 seat_handle_capabilities(void *data, struct wl_seat *seat,
 201                          enum wl_seat_capability caps)
 202 {
 203         struct touch *touch = data;
 204
 205         if ((caps & WL_SEAT_CAPABILITY_TOUCH) && !touch->wl_touch) {
 206                 touch->wl_touch = wl_seat_get_touch(seat);
 207                 wl_touch_set_user_data(touch->wl_touch, touch);
 208                 wl_touch_add_listener(touch->wl_touch, &touch_listener, touch);
 209         } else if (!(caps & WL_SEAT_CAPABILITY_TOUCH) && touch->wl_touch) {
 210                 wl_touch_destroy(touch->wl_touch);
 211                 touch->wl_touch = NULL;
 212         }
 213 }
 214
 215 static const struct wl_seat_listener seat_listener = {
 216         seat_handle_capabilities,
 217 };
 218
 219 static void
 220 handle_ping(void *data, struct wl_shell_surface *shell_surface,
 221             uint32_t serial)
 222 {
 223         wl_shell_surface_pong(shell_surface, serial);
 224 }
 225
 226 static void
 227 handle_configure(void *data, struct wl_shell_surface *shell_surface,
 228                  uint32_t edges, int32_t width, int32_t height)
 229 {
 230 }
 231
 232 static void
 233 handle_popup_done(void *data, struct wl_shell_surface *shell_surface)
 234 {
 235 }
 236
 237 static const struct wl_shell_surface_listener shell_surface_listener = {
 238         handle_ping,
 239         handle_configure,
 240         handle_popup_done
 241 };
 242
 243 static void
 244 handle_global(void *data, struct wl_registry *registry,
 245               uint32_t name, const char *interface, uint32_t version)
 246 {
 247         struct touch *touch = data;
 248
 249         if (strcmp(interface, "wl_compositor") == 0) {
 250                 touch->compositor =
 251                         wl_registry_bind(registry, name,
 252                                          &wl_compositor_interface, 1);
 253         } else if (strcmp(interface, "wl_shell") == 0) {
 254                 touch->shell =
 255                         wl_registry_bind(registry, name,
 256                                          &wl_shell_interface, 1);
 257         } else if (strcmp(interface, "wl_shm") == 0) {
 258                 touch->shm = wl_registry_bind(registry, name,
 259                                               &wl_shm_interface, 1);
 260                 wl_shm_add_listener(touch->shm, &shm_listenter, touch);
 261         } else if (strcmp(interface, "wl_seat") == 0) {
 262                 touch->seat = wl_registry_bind(registry, name,
 263                                                &wl_seat_interface, 1);
 264                 wl_seat_add_listener(touch->seat, &seat_listener, touch);
 265         }
 266 }
 267
 268 static void
 269 handle_global_remove(void *data, struct wl_registry *registry, uint32_t name)
 270 {
 271 }
 272
 273 static const struct wl_registry_listener registry_listener = {
 274         handle_global,
 275         handle_global_remove
 276 };
 277
 278 static struct touch *
 279 touch_create(int width, int height)
 280 {
 281         struct touch *touch;
 282
 283         touch = malloc(sizeof *touch);
 284         touch->display = wl_display_connect(NULL);
 285         assert(touch->display);
 286
 287         touch->has_argb = 0;
 288         touch->registry = wl_display_get_registry(touch->display);
 289         wl_registry_add_listener(touch->registry, &registry_listener, touch);
 290         wl_display_dispatch(touch->display);
 291         wl_display_roundtrip(touch->display);
 292
 293         if (!touch->has_argb) {
 294                 fprintf(stderr, "WL_SHM_FORMAT_ARGB32 not available\n");
 295                 exit(1);
 296         }
 297
 298         wl_display_get_fd(touch->display);
 299
 300         touch->width = width;
 301         touch->height = height;
 302         touch->surface = wl_compositor_create_surface(touch->compositor);
 303         touch->shell_surface = wl_shell_get_shell_surface(touch->shell,
 304                                                           touch->surface);
 305         create_shm_buffer(touch);
 306
 307         if (touch->shell_surface) {
 308                 wl_shell_surface_add_listener(touch->shell_surface,
 309                                               &shell_surface_listener, touch);
 310                 wl_shell_surface_set_toplevel(touch->shell_surface);
 311         }
 312
 313         wl_surface_set_user_data(touch->surface, touch);
 314         wl_shell_surface_set_title(touch->shell_surface, "simple-touch");
 315
 316         memset(touch->data, 64, width * height * 4);
 317         wl_surface_attach(touch->surface, touch->buffer, 0, 0);
 318         wl_surface_damage(touch->surface, 0, 0, width, height);
 319         wl_surface_commit(touch->surface);
 320
 321         return touch;
 322 }
 323
 324 int
 325 main(int argc, char **argv)
 326 {
 327         struct touch *touch;
 328         int ret = 0;
 329
 330         touch = touch_create(600, 500);
 331
 332         while (ret != -1)
 333                 ret = wl_display_dispatch(touch->display);
 334
 335         return 0;
 336 }