wayland_bridge/
scenic.rs

1// Copyright 2019 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 fidl_fuchsia_ui_composition::{ContentId, FlatlandProxy, PresentArgs, TransformId};
6use fuchsia_trace as ftrace;
7use std::cell::RefCell;
8use std::rc::Rc;
9use std::sync::atomic::{AtomicUsize, Ordering};
10
11pub type FlatlandInstanceId = usize;
12
13static NEXT_FLATLAND_INSTANCE_ID: AtomicUsize = AtomicUsize::new(1);
14
15pub struct Flatland {
16    flatland: FlatlandProxy,
17    id: FlatlandInstanceId,
18    id_generator: fuchsia_scenic::flatland::IdGenerator,
19    release_fences: Vec<zx::Event>,
20    next_trace_id: u64,
21}
22
23pub type FlatlandPtr = Rc<RefCell<Flatland>>;
24
25/// A thin wrapper around `FlatlandProxy`, which currently exits
26/// to allocate transform/content ids, and implement flow events
27/// for `present` calls.
28///
29/// Scenic will maintain it's own present counter so we need to ensure
30/// each an every present call increments the trace_id otherwise our
31/// traces will not be generated correctly.
32impl Flatland {
33    pub fn new(flatland: FlatlandProxy) -> FlatlandPtr {
34        let id = NEXT_FLATLAND_INSTANCE_ID.fetch_add(1, Ordering::SeqCst);
35        let debug_name = format!("WaylandBridge:{}", id);
36        flatland.set_debug_name(&debug_name).expect("fidl error");
37
38        Rc::new(RefCell::new(Flatland {
39            flatland,
40            id,
41            id_generator: fuchsia_scenic::flatland::IdGenerator::new(),
42            release_fences: vec![],
43            next_trace_id: 1,
44        }))
45    }
46
47    pub fn id(&self) -> FlatlandInstanceId {
48        self.id
49    }
50
51    pub fn proxy(&self) -> &FlatlandProxy {
52        &self.flatland
53    }
54
55    pub fn add_release_fence(&mut self, fence: zx::Event) {
56        self.release_fences.push(fence);
57    }
58
59    pub fn present(&mut self, presentation_time: i64) {
60        let release_fences: Vec<_> = self.release_fences.drain(..).collect();
61        self.flatland
62            .present(PresentArgs {
63                requested_presentation_time: Some(presentation_time),
64                acquire_fences: None,
65                release_fences: Some(release_fences),
66                // Allow frames to be skipped when commit rate is too high.
67                unsquashable: Some(false),
68                ..Default::default()
69            })
70            .unwrap_or_else(|e| eprintln!("present error: {:?}", e));
71    }
72
73    pub fn alloc_transform_id(&mut self) -> TransformId {
74        self.id_generator.next_transform_id()
75    }
76
77    pub fn alloc_content_id(&mut self) -> ContentId {
78        self.id_generator.next_content_id()
79    }
80
81    pub fn alloc_trace_id(&mut self) -> ftrace::Id {
82        let id = self.next_trace_id;
83        self.next_trace_id += 1;
84        id.into()
85    }
86}
wayland_bridge/scenic.rs

wayland_bridge/
scenic.rs
