wayland_bridge/
shm.rs

1// Copyright 2018 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5use crate::client::Client;
6use crate::object::{ObjectRef, RequestReceiver};
7use anyhow::{format_err, Error};
8use wayland_server_protocol::*;
9use {fuchsia_trace as ftrace, fuchsia_wayland_core as wl};
10
11/// The set of pixel formats that will be announced to clients.
12/// Note: We don't actually support any shm formats but not reporting these as
13/// supported will confuse Sommelier even if they will never be used. Sommelier
14/// will use dmabuf protocol as that is available.
15const SUPPORTED_PIXEL_FORMATS: &[wl_shm::Format] =
16    &[wl_shm::Format::Argb8888, wl_shm::Format::Xrgb8888];
17
18/// The wl_shm global.
19pub struct Shm;
20
21impl Shm {
22    /// Creates a new `Shm`.
23    pub fn new() -> Self {
24        Self
25    }
26
27    /// Posts an event back to the client for each supported SHM pixel format.
28    pub fn post_formats(&self, this: wl::ObjectId, client: &Client) -> Result<(), Error> {
29        ftrace::duration!(c"wayland", c"Shm::post_formats");
30        for format in SUPPORTED_PIXEL_FORMATS.iter() {
31            client.event_queue().post(this, WlShmEvent::Format { format: *format })?;
32        }
33        Ok(())
34    }
35}
36
37impl RequestReceiver<WlShm> for Shm {
38    fn receive(
39        _this: ObjectRef<Self>,
40        _request: WlShmRequest,
41        _client: &mut Client,
42    ) -> Result<(), Error> {
43        Err(format_err!("Shm::receive not supported"))
44    }
45}