2 * Copyright (c) 2017-2019, 2021 Arm Limited.
4 * SPDX-License-Identifier: MIT
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in all
14 * copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
25 #include "wl_helpers.hpp"
33 #include "wl_object_owner.hpp"
35 #include "util/log.hpp"
39 void registry_handler(void *data, struct wl_registry *wl_registry, uint32_t name, const char *interface,
42 auto dmabuf_interface = reinterpret_cast<wsi::wayland::zwp_linux_dmabuf_v1_owner* >(data);
44 if (!strcmp(interface, "zwp_linux_dmabuf_v1"))
46 version = ZWP_LINUX_DMABUF_V1_MODIFIER_SINCE_VERSION;
47 zwp_linux_dmabuf_v1 *dmabuf_interface_obj =
48 reinterpret_cast<zwp_linux_dmabuf_v1 *>(wl_registry_bind(
49 wl_registry, name, &zwp_linux_dmabuf_v1_interface, version));
51 if (dmabuf_interface_obj == nullptr)
53 WSI_LOG_ERROR("Failed to get zwp_linux_dmabuf_v1 interface.");
57 dmabuf_interface->reset(dmabuf_interface_obj);
61 int dispatch_queue(struct wl_display *display, struct wl_event_queue *queue, int timeout)
64 struct pollfd pfd = {};
67 /* Before we sleep, dispatch any pending events. prepare_read_queue will return 0 whilst there are pending
68 * events to dispatch on the queue. */
69 while (0 != wl_display_prepare_read_queue(display, queue))
71 /* dispatch_queue_pending returns -1 on error, or the number of events dispatched otherwise. If we
72 * already dispatched some events, then we might not need to sleep, as we might have just dispatched
73 * the event we want, so return immediately. */
74 err = wl_display_dispatch_queue_pending(display, queue);
77 return (0 > err) ? -1 : 1;
81 /* wl_display_read_events performs a non-blocking read. */
82 pfd.fd = wl_display_get_fd(display);
86 /* Timeout is given in milliseconds. A return value of 0, or -1 with errno set to EINTR means that we
87 * should retry as the timeout was exceeded or we were interrupted by a signal, respectively. A
88 * return value of 1 means that something happened, and we should inspect the pollfd structure to see
91 err = poll(&pfd, 1, timeout);
95 wl_display_cancel_read(display);
102 /* Interrupted by a signal; restart. This resets the timeout. */
107 /* Something else bad happened; abort. */
108 wl_display_cancel_read(display);
114 if (POLLIN == pfd.revents)
116 /* We have data to read, and no errors; proceed to read_events. */
121 /* An error occurred, e.g. file descriptor was closed from underneath us. */
122 wl_display_cancel_read(display);
128 /* Actually read the events from the display. A failure in read_events calls cancel_read internally for us,
129 * so we don't need to do that here. */
130 err = wl_display_read_events(display);
136 /* Finally, if we read any events relevant to our queue, we can dispatch them. */
137 err = wl_display_dispatch_queue_pending(display, queue);
138 retval = err < 0 ? -1 : 1;