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servo/components/compositing/compositor.rs
Martin Robinson edeb24b30f Fix scrolling on root element 
eca0acf459 uncovered a bug in the way that
the scrolling area of `window` was calculated and broke scrolling on the
root element. This change does two things in order to fix that:

1. Does a partial revert of eca0acf459 in
   order to get scrolling from script working again on the window
   object.
2. Has the compositor always generate a frame for scrolls starting from
   script and waits for them. This is speculative fix for flakiness in
   root scrolling tests on CI.
2023-05-05 12:42:02 +02:00

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use crate::compositor_thread::CompositorReceiver;
use crate::compositor_thread::{
InitialCompositorState, Msg, WebrenderCanvasMsg, WebrenderFontMsg, WebrenderMsg,
};
#[cfg(feature = "gl")]
use crate::gl;
use crate::touch::{TouchAction, TouchHandler};
use crate::windowing::{
self, EmbedderCoordinates, MouseWindowEvent, WebRenderDebugOption, WindowMethods,
};
use crate::{CompositionPipeline, ConstellationMsg, SendableFrameTree};
use canvas::canvas_paint_thread::ImageUpdate;
use crossbeam_channel::Sender;
use embedder_traits::Cursor;
use euclid::{Point2D, Rect, Scale, Vector2D};
use gfx_traits::{Epoch, FontData};
#[cfg(feature = "gl")]
use image::{DynamicImage, ImageFormat};
use ipc_channel::ipc;
use libc::c_void;
use log::warn;
use msg::constellation_msg::{
PipelineId, PipelineIndex, PipelineNamespaceId, TopLevelBrowsingContextId,
};
use net_traits::image::base::Image;
use net_traits::image_cache::CorsStatus;
#[cfg(feature = "gl")]
use pixels::PixelFormat;
use profile_traits::time::{self as profile_time, profile, ProfilerCategory};
use script_traits::compositor::HitTestInfo;
use script_traits::CompositorEvent::{MouseButtonEvent, MouseMoveEvent, TouchEvent, WheelEvent};
use script_traits::{
AnimationState, AnimationTickType, CompositorHitTestResult, LayoutControlMsg, MouseButton,
MouseEventType, ScrollState, TouchEventType, TouchId, UntrustedNodeAddress, WheelDelta,
WindowSizeData, WindowSizeType,
};
use servo_geometry::{DeviceIndependentPixel, FramebufferUintLength};
use std::collections::HashMap;
use std::env;
use std::fs::{create_dir_all, File};
use std::io::Write;
use std::num::NonZeroU32;
use std::rc::Rc;
use style_traits::viewport::ViewportConstraints;
use style_traits::{CSSPixel, DevicePixel, PinchZoomFactor};
use time::{now, precise_time_ns, precise_time_s};
use webrender_api::units::{
DeviceIntPoint, DeviceIntSize, DevicePoint, LayoutVector2D, WorldPoint,
};
use webrender_api::{self, HitTestFlags, ScrollLocation};
use webrender_surfman::WebrenderSurfman;
#[derive(Debug, PartialEq)]
enum UnableToComposite {
NotReadyToPaintImage(NotReadyToPaint),
}
#[derive(Debug, PartialEq)]
enum NotReadyToPaint {
AnimationsActive,
JustNotifiedConstellation,
WaitingOnConstellation,
}
// Default viewport constraints
const MAX_ZOOM: f32 = 8.0;
const MIN_ZOOM: f32 = 0.1;
trait ConvertPipelineIdFromWebRender {
fn from_webrender(&self) -> PipelineId;
}
impl ConvertPipelineIdFromWebRender for webrender_api::PipelineId {
fn from_webrender(&self) -> PipelineId {
PipelineId {
namespace_id: PipelineNamespaceId(self.0),
index: PipelineIndex(NonZeroU32::new(self.1).expect("Webrender pipeline zero?")),
}
}
}
/// Holds the state when running reftests that determines when it is
/// safe to save the output image.
#[derive(Clone, Copy, Debug, PartialEq)]
enum ReadyState {
Unknown,
WaitingForConstellationReply,
ReadyToSaveImage,
}
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
struct FrameTreeId(u32);
impl FrameTreeId {
pub fn next(&mut self) {
self.0 += 1;
}
}
/// One pixel in layer coordinate space.
///
/// This unit corresponds to a "pixel" in layer coordinate space, which after scaling and
/// transformation becomes a device pixel.
#[derive(Clone, Copy, Debug)]
enum LayerPixel {}
struct RootPipeline {
top_level_browsing_context_id: TopLevelBrowsingContextId,
id: Option<PipelineId>,
}
/// NB: Never block on the constellation, because sometimes the constellation blocks on us.
pub struct IOCompositor<Window: WindowMethods + ?Sized> {
/// The application window.
pub window: Rc<Window>,
/// The port on which we receive messages.
port: CompositorReceiver,
/// The root pipeline.
root_pipeline: RootPipeline,
/// Tracks details about each active pipeline that the compositor knows about.
pipeline_details: HashMap<PipelineId, PipelineDetails>,
/// The scene scale, to allow for zooming and high-resolution painting.
scale: Scale<f32, LayerPixel, DevicePixel>,
/// "Mobile-style" zoom that does not reflow the page.
viewport_zoom: PinchZoomFactor,
/// Viewport zoom constraints provided by @viewport.
min_viewport_zoom: Option<PinchZoomFactor>,
max_viewport_zoom: Option<PinchZoomFactor>,
/// "Desktop-style" zoom that resizes the viewport to fit the window.
page_zoom: Scale<f32, CSSPixel, DeviceIndependentPixel>,
/// The type of composition to perform
composite_target: CompositeTarget,
/// Tracks whether we should composite this frame.
composition_request: CompositionRequest,
/// Tracks whether we are in the process of shutting down, or have shut down and should close
/// the compositor.
pub shutdown_state: ShutdownState,
/// Tracks whether the zoom action has happened recently.
zoom_action: bool,
/// The time of the last zoom action has started.
zoom_time: f64,
/// The current frame tree ID (used to reject old paint buffers)
frame_tree_id: FrameTreeId,
/// The channel on which messages can be sent to the constellation.
constellation_chan: Sender<ConstellationMsg>,
/// The channel on which messages can be sent to the time profiler.
time_profiler_chan: profile_time::ProfilerChan,
/// Touch input state machine
touch_handler: TouchHandler,
/// Pending scroll/zoom events.
pending_scroll_zoom_events: Vec<ScrollZoomEvent>,
/// Whether we're waiting on a recomposite after dispatching a scroll.
waiting_for_results_of_scroll: bool,
/// Used by the logic that determines when it is safe to output an
/// image for the reftest framework.
ready_to_save_state: ReadyState,
/// The webrender renderer.
webrender: webrender::Renderer,
/// The active webrender document.
webrender_document: webrender_api::DocumentId,
/// The webrender interface, if enabled.
webrender_api: webrender_api::RenderApi,
/// The surfman instance that webrender targets
webrender_surfman: WebrenderSurfman,
/// The GL bindings for webrender
webrender_gl: Rc<dyn gleam::gl::Gl>,
/// Some XR devices want to run on the main thread.
pub webxr_main_thread: webxr::MainThreadRegistry,
/// Map of the pending paint metrics per layout thread.
/// The layout thread for each specific pipeline expects the compositor to
/// paint frames with specific given IDs (epoch). Once the compositor paints
/// these frames, it records the paint time for each of them and sends the
/// metric to the corresponding layout thread.
pending_paint_metrics: HashMap<PipelineId, Epoch>,
/// The coordinates of the native window, its view and the screen.
embedder_coordinates: EmbedderCoordinates,
/// Current mouse cursor.
cursor: Cursor,
/// Current cursor position.
cursor_pos: DevicePoint,
output_file: Option<String>,
is_running_problem_test: bool,
/// True to exit after page load ('-x').
exit_after_load: bool,
/// True to translate mouse input into touch events.
convert_mouse_to_touch: bool,
/// True if a WR frame render has been requested. Screenshots
/// taken before the render is complete will not reflect the
/// most up to date rendering.
waiting_on_pending_frame: bool,
}
#[derive(Clone, Copy)]
struct ScrollZoomEvent {
/// Change the pinch zoom level by this factor
magnification: f32,
/// Scroll by this offset, or to Start or End
scroll_location: ScrollLocation,
/// Apply changes to the frame at this location
cursor: DeviceIntPoint,
/// The number of OS events that have been coalesced together into this one event.
event_count: u32,
}
#[derive(Debug, PartialEq)]
enum CompositionRequest {
NoCompositingNecessary,
CompositeNow(CompositingReason),
}
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum ShutdownState {
NotShuttingDown,
ShuttingDown,
FinishedShuttingDown,
}
struct PipelineDetails {
/// The pipeline associated with this PipelineDetails object.
pipeline: Option<CompositionPipeline>,
/// Whether animations are running
animations_running: bool,
/// Whether there are animation callbacks
animation_callbacks_running: bool,
/// Whether this pipeline is visible
visible: bool,
/// Hit test items for this pipeline. This is used to map WebRender hit test
/// information to the full information necessary for Servo.
hit_test_items: Vec<HitTestInfo>,
}
impl PipelineDetails {
fn new() -> PipelineDetails {
PipelineDetails {
pipeline: None,
animations_running: false,
animation_callbacks_running: false,
visible: true,
hit_test_items: Vec::new(),
}
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
enum CompositeTarget {
/// Normal composition to a window
Window,
/// Compose as normal, but also return a PNG of the composed output
WindowAndPng,
/// Compose to a PNG, write it to disk, and then exit the browser (used for reftests)
PngFile,
}
impl<Window: WindowMethods + ?Sized> IOCompositor<Window> {
fn new(
window: Rc<Window>,
state: InitialCompositorState,
output_file: Option<String>,
is_running_problem_test: bool,
exit_after_load: bool,
convert_mouse_to_touch: bool,
top_level_browsing_context_id: TopLevelBrowsingContextId,
) -> Self {
let composite_target = match output_file {
Some(_) => CompositeTarget::PngFile,
None => CompositeTarget::Window,
};
IOCompositor {
embedder_coordinates: window.get_coordinates(),
window,
port: state.receiver,
root_pipeline: RootPipeline {
top_level_browsing_context_id,
id: None,
},
pipeline_details: HashMap::new(),
scale: Scale::new(1.0),
composition_request: CompositionRequest::NoCompositingNecessary,
touch_handler: TouchHandler::new(),
pending_scroll_zoom_events: Vec::new(),
waiting_for_results_of_scroll: false,
composite_target,
shutdown_state: ShutdownState::NotShuttingDown,
page_zoom: Scale::new(1.0),
viewport_zoom: PinchZoomFactor::new(1.0),
min_viewport_zoom: None,
max_viewport_zoom: None,
zoom_action: false,
zoom_time: 0f64,
frame_tree_id: FrameTreeId(0),
constellation_chan: state.constellation_chan,
time_profiler_chan: state.time_profiler_chan,
ready_to_save_state: ReadyState::Unknown,
webrender: state.webrender,
webrender_document: state.webrender_document,
webrender_api: state.webrender_api,
webrender_surfman: state.webrender_surfman,
webrender_gl: state.webrender_gl,
webxr_main_thread: state.webxr_main_thread,
pending_paint_metrics: HashMap::new(),
cursor: Cursor::None,
cursor_pos: DevicePoint::new(0.0, 0.0),
output_file,
is_running_problem_test,
exit_after_load,
convert_mouse_to_touch,
waiting_on_pending_frame: false,
}
}
pub fn create(
window: Rc<Window>,
state: InitialCompositorState,
output_file: Option<String>,
is_running_problem_test: bool,
exit_after_load: bool,
convert_mouse_to_touch: bool,
top_level_browsing_context_id: TopLevelBrowsingContextId,
) -> Self {
let mut compositor = IOCompositor::new(
window,
state,
output_file,
is_running_problem_test,
exit_after_load,
convert_mouse_to_touch,
top_level_browsing_context_id,
);
// Make sure the GL state is OK
compositor.assert_gl_framebuffer_complete();
// Set the size of the root layer.
compositor.update_zoom_transform();
compositor
}
pub fn deinit(self) {
if let Err(err) = self.webrender_surfman.make_gl_context_current() {
warn!("Failed to make GL context current: {:?}", err);
}
self.webrender.deinit();
}
fn update_cursor(&mut self, result: CompositorHitTestResult) {
let cursor = match result.cursor {
Some(cursor) if cursor != self.cursor => cursor,
_ => return,
};
self.cursor = cursor;
let msg = ConstellationMsg::SetCursor(cursor);
if let Err(e) = self.constellation_chan.send(msg) {
warn!("Sending event to constellation failed ({:?}).", e);
}
}
pub fn maybe_start_shutting_down(&mut self) {
if self.shutdown_state == ShutdownState::NotShuttingDown {
debug!("Shutting down the constellation for WindowEvent::Quit");
self.start_shutting_down();
}
}
fn start_shutting_down(&mut self) {
debug!("Compositor sending Exit message to Constellation");
if let Err(e) = self.constellation_chan.send(ConstellationMsg::Exit) {
warn!("Sending exit message to constellation failed ({:?}).", e);
}
self.shutdown_state = ShutdownState::ShuttingDown;
}
fn finish_shutting_down(&mut self) {
debug!("Compositor received message that constellation shutdown is complete");
// Drain compositor port, sometimes messages contain channels that are blocking
// another thread from finishing (i.e. SetFrameTree).
while self.port.try_recv_compositor_msg().is_some() {}
// Tell the profiler, memory profiler, and scrolling timer to shut down.
if let Ok((sender, receiver)) = ipc::channel() {
self.time_profiler_chan
.send(profile_time::ProfilerMsg::Exit(sender));
let _ = receiver.recv();
}
self.shutdown_state = ShutdownState::FinishedShuttingDown;
}
fn handle_browser_message(&mut self, msg: Msg) -> bool {
match (msg, self.shutdown_state) {
(_, ShutdownState::FinishedShuttingDown) => {
error!("compositor shouldn't be handling messages after shutting down");
return false;
},
(Msg::ShutdownComplete, _) => {
self.finish_shutting_down();
return false;
},
(
Msg::ChangeRunningAnimationsState(pipeline_id, animation_state),
ShutdownState::NotShuttingDown,
) => {
self.change_running_animations_state(pipeline_id, animation_state);
},
(Msg::SetFrameTree(frame_tree), ShutdownState::NotShuttingDown) => {
self.set_frame_tree(&frame_tree);
self.send_viewport_rects();
},
(Msg::Recomposite(reason), ShutdownState::NotShuttingDown) => {
self.waiting_on_pending_frame = false;
self.composition_request = CompositionRequest::CompositeNow(reason)
},
(Msg::TouchEventProcessed(result), ShutdownState::NotShuttingDown) => {
self.touch_handler.on_event_processed(result);
},
(Msg::CreatePng(rect, reply), ShutdownState::NotShuttingDown) => {
let res = self.composite_specific_target(CompositeTarget::WindowAndPng, rect);
if let Err(ref e) = res {
info!("Error retrieving PNG: {:?}", e);
}
let img = res.unwrap_or(None);
if let Err(e) = reply.send(img) {
warn!("Sending reply to create png failed ({:?}).", e);
}
},
(
Msg::ViewportConstrained(pipeline_id, constraints),
ShutdownState::NotShuttingDown,
) => {
self.constrain_viewport(pipeline_id, constraints);
},
(Msg::IsReadyToSaveImageReply(is_ready), ShutdownState::NotShuttingDown) => {
assert_eq!(
self.ready_to_save_state,
ReadyState::WaitingForConstellationReply
);
if is_ready && !self.waiting_on_pending_frame && !self.waiting_for_results_of_scroll
{
self.ready_to_save_state = ReadyState::ReadyToSaveImage;
if self.is_running_problem_test {
println!("ready to save image!");
}
} else {
self.ready_to_save_state = ReadyState::Unknown;
if self.is_running_problem_test {
println!("resetting ready_to_save_state!");
}
}
self.composite_if_necessary(CompositingReason::Headless);
},
(
Msg::PipelineVisibilityChanged(pipeline_id, visible),
ShutdownState::NotShuttingDown,
) => {
self.pipeline_details(pipeline_id).visible = visible;
self.process_animations();
},
(Msg::PipelineExited(pipeline_id, sender), _) => {
debug!("Compositor got pipeline exited: {:?}", pipeline_id);
self.remove_pipeline_root_layer(pipeline_id);
let _ = sender.send(());
},
(Msg::NewScrollFrameReady(recomposite_needed), ShutdownState::NotShuttingDown) => {
self.waiting_for_results_of_scroll = false;
if let Some(result) = self.hit_test_at_device_point(self.cursor_pos) {
self.update_cursor(result);
}
if recomposite_needed {
self.composition_request = CompositionRequest::CompositeNow(
CompositingReason::NewWebRenderScrollFrame,
);
}
},
(Msg::Dispatch(func), ShutdownState::NotShuttingDown) => {
// The functions sent here right now are really dumb, so they can't panic.
// But if we start running more complex code here, we should really catch panic here.
func();
},
(Msg::LoadComplete(_), ShutdownState::NotShuttingDown) => {
// If we're painting in headless mode, schedule a recomposite.
if self.output_file.is_some() || self.exit_after_load {
self.composite_if_necessary(CompositingReason::Headless);
}
},
(
Msg::WebDriverMouseButtonEvent(mouse_event_type, mouse_button, x, y),
ShutdownState::NotShuttingDown,
) => {
let dppx = self.device_pixels_per_page_px();
let point = dppx.transform_point(Point2D::new(x, y));
self.on_mouse_window_event_class(match mouse_event_type {
MouseEventType::Click => MouseWindowEvent::Click(mouse_button, point),
MouseEventType::MouseDown => MouseWindowEvent::MouseDown(mouse_button, point),
MouseEventType::MouseUp => MouseWindowEvent::MouseUp(mouse_button, point),
});
},
(Msg::WebDriverMouseMoveEvent(x, y), ShutdownState::NotShuttingDown) => {
let dppx = self.device_pixels_per_page_px();
let point = dppx.transform_point(Point2D::new(x, y));
self.on_mouse_window_move_event_class(DevicePoint::new(point.x, point.y));
},
(Msg::PendingPaintMetric(pipeline_id, epoch), _) => {
self.pending_paint_metrics.insert(pipeline_id, epoch);
},
(Msg::GetClientWindow(req), ShutdownState::NotShuttingDown) => {
if let Err(e) = req.send(self.embedder_coordinates.window) {
warn!("Sending response to get client window failed ({:?}).", e);
}
},
(Msg::GetScreenSize(req), ShutdownState::NotShuttingDown) => {
if let Err(e) = req.send(self.embedder_coordinates.screen) {
warn!("Sending response to get screen size failed ({:?}).", e);
}
},
(Msg::GetScreenAvailSize(req), ShutdownState::NotShuttingDown) => {
if let Err(e) = req.send(self.embedder_coordinates.screen_avail) {
warn!(
"Sending response to get screen avail size failed ({:?}).",
e
);
}
},
(Msg::Webrender(msg), ShutdownState::NotShuttingDown) => {
self.handle_webrender_message(msg);
},
// When we are shutting_down, we need to avoid performing operations
// such as Paint that may crash because we have begun tearing down
// the rest of our resources.
(_, ShutdownState::ShuttingDown) => {},
}
true
}
/// Accept messages from content processes that need to be relayed to the WebRender
/// instance in the parent process.
fn handle_webrender_message(&mut self, msg: WebrenderMsg) {
match msg {
WebrenderMsg::Layout(script_traits::WebrenderMsg::SendInitialTransaction(pipeline)) => {
self.waiting_on_pending_frame = true;
let mut txn = webrender_api::Transaction::new();
txn.set_display_list(
webrender_api::Epoch(0),
None,
Default::default(),
(pipeline, Default::default(), Default::default()),
false,
);
self.webrender_api
.send_transaction(self.webrender_document, txn);
},
WebrenderMsg::Layout(script_traits::WebrenderMsg::SendScrollNode(
point,
scroll_id,
clamping,
)) => {
self.waiting_for_results_of_scroll = true;
let mut txn = webrender_api::Transaction::new();
txn.scroll_node_with_id(point, scroll_id, clamping);
txn.generate_frame();
self.webrender_api
.send_transaction(self.webrender_document, txn);
},
WebrenderMsg::Layout(script_traits::WebrenderMsg::SendDisplayList(
epoch,
size,
pipeline,
size2,
receiver,
descriptor,
compositor_display_list_info,
)) => match receiver.recv() {
Ok(data) => {
self.waiting_on_pending_frame = true;
let details = self.pipeline_details(PipelineId::from_webrender(pipeline));
details.hit_test_items = compositor_display_list_info.hit_test_info;
let mut txn = webrender_api::Transaction::new();
txn.set_display_list(
epoch,
None,
size,
(
pipeline,
size2,
webrender_api::BuiltDisplayList::from_data(data, descriptor),
),
true,
);
txn.generate_frame();
self.webrender_api
.send_transaction(self.webrender_document, txn);
},
Err(e) => warn!("error receiving display data: {:?}", e),
},
WebrenderMsg::Layout(script_traits::WebrenderMsg::HitTest(
pipeline,
point,
flags,
sender,
)) => {
// When a display list is sent to WebRender, it starts scene building in a
// separate thread and then that display list is available for hit testing.
// Without flushing scene building, any hit test we do might be done against
// a previous scene, if the last one we sent hasn't finished building.
//
// TODO(mrobinson): Flushing all scene building is a big hammer here, because
// we might only be interested in a single pipeline. The only other option
// would be to listen to the TransactionNotifier for previous per-pipeline
// transactions, but that isn't easily compatible with the event loop wakeup
// mechanism from libserver.
self.webrender_api.flush_scene_builder();
let result = self.hit_test_at_point_with_flags_and_pipeline(point, flags, pipeline);
let _ = sender.send(result);
},
WebrenderMsg::Layout(script_traits::WebrenderMsg::GenerateImageKey(sender)) |
WebrenderMsg::Net(net_traits::WebrenderImageMsg::GenerateImageKey(sender)) => {
let _ = sender.send(self.webrender_api.generate_image_key());
},
WebrenderMsg::Layout(script_traits::WebrenderMsg::UpdateImages(updates)) => {
let mut txn = webrender_api::Transaction::new();
for update in updates {
match update {
script_traits::SerializedImageUpdate::AddImage(key, desc, data) => {
match data.to_image_data() {
Ok(data) => txn.add_image(key, desc, data, None),
Err(e) => warn!("error when sending image data: {:?}", e),
}
},
script_traits::SerializedImageUpdate::DeleteImage(key) => {
txn.delete_image(key)
},
script_traits::SerializedImageUpdate::UpdateImage(key, desc, data) => {
match data.to_image_data() {
Ok(data) => txn.update_image(
key,
desc,
data,
&webrender_api::DirtyRect::All,
),
Err(e) => warn!("error when sending image data: {:?}", e),
}
},
}
}
self.webrender_api
.send_transaction(self.webrender_document, txn);
},
WebrenderMsg::Net(net_traits::WebrenderImageMsg::AddImage(key, desc, data)) => {
let mut txn = webrender_api::Transaction::new();
txn.add_image(key, desc, data, None);
self.webrender_api
.send_transaction(self.webrender_document, txn);
},
WebrenderMsg::Font(WebrenderFontMsg::AddFontInstance(font_key, size, sender)) => {
let key = self.webrender_api.generate_font_instance_key();
let mut txn = webrender_api::Transaction::new();
txn.add_font_instance(key, font_key, size, None, None, Vec::new());
self.webrender_api
.send_transaction(self.webrender_document, txn);
let _ = sender.send(key);
},
WebrenderMsg::Font(WebrenderFontMsg::AddFont(data, sender)) => {
let font_key = self.webrender_api.generate_font_key();
let mut txn = webrender_api::Transaction::new();
match data {
FontData::Raw(bytes) => txn.add_raw_font(font_key, bytes, 0),
FontData::Native(native_font) => txn.add_native_font(font_key, native_font),
}
self.webrender_api
.send_transaction(self.webrender_document, txn);
let _ = sender.send(font_key);
},
WebrenderMsg::Canvas(WebrenderCanvasMsg::GenerateKey(sender)) => {
let _ = sender.send(self.webrender_api.generate_image_key());
},
WebrenderMsg::Canvas(WebrenderCanvasMsg::UpdateImages(updates)) => {
let mut txn = webrender_api::Transaction::new();
for update in updates {
match update {
ImageUpdate::Add(key, descriptor, data) => {
txn.add_image(key, descriptor, data, None)
},
ImageUpdate::Update(key, descriptor, data) => {
txn.update_image(key, descriptor, data, &webrender_api::DirtyRect::All)
},
ImageUpdate::Delete(key) => txn.delete_image(key),
}
}
self.webrender_api
.send_transaction(self.webrender_document, txn);
},
}
}
/// Sets or unsets the animations-running flag for the given pipeline, and schedules a
/// recomposite if necessary.
fn change_running_animations_state(
&mut self,
pipeline_id: PipelineId,
animation_state: AnimationState,
) {
match animation_state {
AnimationState::AnimationsPresent => {
let visible = self.pipeline_details(pipeline_id).visible;
self.pipeline_details(pipeline_id).animations_running = true;
if visible {
self.composite_if_necessary(CompositingReason::Animation);
}
},
AnimationState::AnimationCallbacksPresent => {
let visible = self.pipeline_details(pipeline_id).visible;
self.pipeline_details(pipeline_id)
.animation_callbacks_running = true;
if visible {
self.tick_animations_for_pipeline(pipeline_id);
}
},
AnimationState::NoAnimationsPresent => {
self.pipeline_details(pipeline_id).animations_running = false;
},
AnimationState::NoAnimationCallbacksPresent => {
self.pipeline_details(pipeline_id)
.animation_callbacks_running = false;
},
}
}
fn pipeline_details(&mut self, pipeline_id: PipelineId) -> &mut PipelineDetails {
if !self.pipeline_details.contains_key(&pipeline_id) {
self.pipeline_details
.insert(pipeline_id, PipelineDetails::new());
}
self.pipeline_details
.get_mut(&pipeline_id)
.expect("Insert then get failed!")
}
pub fn pipeline(&self, pipeline_id: PipelineId) -> Option<&CompositionPipeline> {
match self.pipeline_details.get(&pipeline_id) {
Some(ref details) => details.pipeline.as_ref(),
None => {
warn!(
"Compositor layer has an unknown pipeline ({:?}).",
pipeline_id
);
None
},
}
}
fn set_frame_tree(&mut self, frame_tree: &SendableFrameTree) {
debug!(
"Setting the frame tree for pipeline {}",
frame_tree.pipeline.id
);
self.root_pipeline = RootPipeline {
top_level_browsing_context_id: frame_tree.pipeline.top_level_browsing_context_id,
id: Some(frame_tree.pipeline.id),
};
let pipeline_id = frame_tree.pipeline.id.to_webrender();
let mut txn = webrender_api::Transaction::new();
txn.set_root_pipeline(pipeline_id);
txn.generate_frame();
self.webrender_api
.send_transaction(self.webrender_document, txn);
self.create_pipeline_details_for_frame_tree(&frame_tree);
self.frame_tree_id.next();
}
fn create_pipeline_details_for_frame_tree(&mut self, frame_tree: &SendableFrameTree) {
self.pipeline_details(frame_tree.pipeline.id).pipeline = Some(frame_tree.pipeline.clone());
for kid in &frame_tree.children {
self.create_pipeline_details_for_frame_tree(kid);
}
}
fn remove_pipeline_root_layer(&mut self, pipeline_id: PipelineId) {
self.pipeline_details.remove(&pipeline_id);
}
fn send_window_size(&self, size_type: WindowSizeType) {
let dppx = self.page_zoom * self.embedder_coordinates.hidpi_factor;
self.webrender_api.set_document_view(
self.webrender_document,
self.embedder_coordinates.get_flipped_viewport(),
self.embedder_coordinates.hidpi_factor.get(),
);
let initial_viewport = self.embedder_coordinates.viewport.size.to_f32() / dppx;
let data = WindowSizeData {
device_pixel_ratio: dppx,
initial_viewport: initial_viewport,
};
let top_level_browsing_context_id = self.root_pipeline.top_level_browsing_context_id;
let msg = ConstellationMsg::WindowSize(top_level_browsing_context_id, data, size_type);
if let Err(e) = self.constellation_chan.send(msg) {
warn!("Sending window resize to constellation failed ({:?}).", e);
}
}
pub fn on_resize_window_event(&mut self) -> bool {
debug!("compositor resize requested");
let old_coords = self.embedder_coordinates;
self.embedder_coordinates = self.window.get_coordinates();
// A size change could also mean a resolution change.
if self.embedder_coordinates.hidpi_factor != old_coords.hidpi_factor {
self.update_zoom_transform();
}
if self.embedder_coordinates.viewport == old_coords.viewport {
return false;
}
self.send_window_size(WindowSizeType::Resize);
self.composite_if_necessary(CompositingReason::Resize);
return true;
}
pub fn on_mouse_window_event_class(&mut self, mouse_window_event: MouseWindowEvent) {
if self.convert_mouse_to_touch {
match mouse_window_event {
MouseWindowEvent::Click(_, _) => {},
MouseWindowEvent::MouseDown(_, p) => self.on_touch_down(TouchId(0), p),
MouseWindowEvent::MouseUp(_, p) => self.on_touch_up(TouchId(0), p),
}
return;
}
self.dispatch_mouse_window_event_class(mouse_window_event);
}
fn dispatch_mouse_window_event_class(&mut self, mouse_window_event: MouseWindowEvent) {
let point = match mouse_window_event {
MouseWindowEvent::Click(_, p) => p,
MouseWindowEvent::MouseDown(_, p) => p,
MouseWindowEvent::MouseUp(_, p) => p,
};
let result = match self.hit_test_at_device_point(point) {
Some(result) => result,
None => return,
};
let (button, event_type) = match mouse_window_event {
MouseWindowEvent::Click(button, _) => (button, MouseEventType::Click),
MouseWindowEvent::MouseDown(button, _) => (button, MouseEventType::MouseDown),
MouseWindowEvent::MouseUp(button, _) => (button, MouseEventType::MouseUp),
};
let event_to_send = MouseButtonEvent(
event_type,
button,
result.point_in_viewport.to_untyped(),
Some(result.node),
Some(result.point_relative_to_item),
button as u16,
);
let msg = ConstellationMsg::ForwardEvent(result.pipeline_id, event_to_send);
if let Err(e) = self.constellation_chan.send(msg) {
warn!("Sending event to constellation failed ({:?}).", e);
}
}
fn hit_test_at_device_point(&self, point: DevicePoint) -> Option<CompositorHitTestResult> {
let dppx = self.page_zoom * self.hidpi_factor();
let scaled_point = (point / dppx).to_untyped();
let world_point = WorldPoint::from_untyped(scaled_point);
return self.hit_test_at_point(world_point);
}
fn hit_test_at_point(&self, point: WorldPoint) -> Option<CompositorHitTestResult> {
return self
.hit_test_at_point_with_flags_and_pipeline(point, HitTestFlags::empty(), None)
.first()
.cloned();
}
fn hit_test_at_point_with_flags_and_pipeline(
&self,
point: WorldPoint,
flags: HitTestFlags,
pipeline_id: Option<webrender_api::PipelineId>,
) -> Vec<CompositorHitTestResult> {
let root_pipeline_id = match self.root_pipeline.id {
Some(root_pipeline_id) => root_pipeline_id,
None => return vec![],
};
if self.pipeline(root_pipeline_id).is_none() {
return vec![];
}
let results =
self.webrender_api
.hit_test(self.webrender_document, pipeline_id, point, flags);
results
.items
.iter()
.filter_map(|item| {
let pipeline_id = PipelineId::from_webrender(item.pipeline);
let details = match self.pipeline_details.get(&pipeline_id) {
Some(details) => details,
None => return None,
};
let info = &details.hit_test_items[item.tag.0 as usize];
Some(CompositorHitTestResult {
pipeline_id,
point_in_viewport: item.point_in_viewport.to_untyped(),
point_relative_to_item: item.point_relative_to_item.to_untyped(),
node: UntrustedNodeAddress(info.node as *const c_void),
cursor: info.cursor,
})
})
.collect()
}
pub fn on_mouse_window_move_event_class(&mut self, cursor: DevicePoint) {
if self.convert_mouse_to_touch {
self.on_touch_move(TouchId(0), cursor);
return;
}
self.dispatch_mouse_window_move_event_class(cursor);
}
fn dispatch_mouse_window_move_event_class(&mut self, cursor: DevicePoint) {
let result = match self.hit_test_at_device_point(cursor) {
Some(result) => result,
None => return,
};
let event = MouseMoveEvent(result.point_in_viewport, Some(result.node), 0);
let msg = ConstellationMsg::ForwardEvent(result.pipeline_id, event);
if let Err(e) = self.constellation_chan.send(msg) {
warn!("Sending event to constellation failed ({:?}).", e);
}
self.update_cursor(result);
}
fn send_touch_event(
&self,
event_type: TouchEventType,
identifier: TouchId,
point: DevicePoint,
) {
if let Some(result) = self.hit_test_at_device_point(point) {
let event = TouchEvent(
event_type,
identifier,
result.point_in_viewport,
Some(result.node),
);
let msg = ConstellationMsg::ForwardEvent(result.pipeline_id, event);
if let Err(e) = self.constellation_chan.send(msg) {
warn!("Sending event to constellation failed ({:?}).", e);
}
}
}
pub fn send_wheel_event(&mut self, delta: WheelDelta, point: DevicePoint) {
if let Some(result) = self.hit_test_at_device_point(point) {
let event = WheelEvent(delta, result.point_in_viewport, Some(result.node));
let msg = ConstellationMsg::ForwardEvent(result.pipeline_id, event);
if let Err(e) = self.constellation_chan.send(msg) {
warn!("Sending event to constellation failed ({:?}).", e);
}
}
}
pub fn on_touch_event(
&mut self,
event_type: TouchEventType,
identifier: TouchId,
location: DevicePoint,
) {
match event_type {
TouchEventType::Down => self.on_touch_down(identifier, location),
TouchEventType::Move => self.on_touch_move(identifier, location),
TouchEventType::Up => self.on_touch_up(identifier, location),
TouchEventType::Cancel => self.on_touch_cancel(identifier, location),
}
}
fn on_touch_down(&mut self, identifier: TouchId, point: DevicePoint) {
self.touch_handler.on_touch_down(identifier, point);
self.send_touch_event(TouchEventType::Down, identifier, point);
}
fn on_touch_move(&mut self, identifier: TouchId, point: DevicePoint) {
match self.touch_handler.on_touch_move(identifier, point) {
TouchAction::Scroll(delta) => self.on_scroll_window_event(
ScrollLocation::Delta(LayoutVector2D::from_untyped(delta.to_untyped())),
point.cast(),
),
TouchAction::Zoom(magnification, scroll_delta) => {
let cursor = Point2D::new(-1, -1); // Make sure this hits the base layer.
self.pending_scroll_zoom_events.push(ScrollZoomEvent {
magnification: magnification,
scroll_location: ScrollLocation::Delta(LayoutVector2D::from_untyped(
scroll_delta.to_untyped(),
)),
cursor: cursor,
event_count: 1,
});
},
TouchAction::DispatchEvent => {
self.send_touch_event(TouchEventType::Move, identifier, point);
},
_ => {},
}
}
fn on_touch_up(&mut self, identifier: TouchId, point: DevicePoint) {
self.send_touch_event(TouchEventType::Up, identifier, point);
if let TouchAction::Click = self.touch_handler.on_touch_up(identifier, point) {
self.simulate_mouse_click(point);
}
}
fn on_touch_cancel(&mut self, identifier: TouchId, point: DevicePoint) {
// Send the event to script.
self.touch_handler.on_touch_cancel(identifier, point);
self.send_touch_event(TouchEventType::Cancel, identifier, point);
}
/// <http://w3c.github.io/touch-events/#mouse-events>
fn simulate_mouse_click(&mut self, p: DevicePoint) {
let button = MouseButton::Left;
self.dispatch_mouse_window_move_event_class(p);
self.dispatch_mouse_window_event_class(MouseWindowEvent::MouseDown(button, p));
self.dispatch_mouse_window_event_class(MouseWindowEvent::MouseUp(button, p));
self.dispatch_mouse_window_event_class(MouseWindowEvent::Click(button, p));
}
pub fn on_wheel_event(&mut self, delta: WheelDelta, p: DevicePoint) {
self.send_wheel_event(delta, p);
}
pub fn on_scroll_event(
&mut self,
delta: ScrollLocation,
cursor: DeviceIntPoint,
phase: TouchEventType,
) {
match phase {
TouchEventType::Move => self.on_scroll_window_event(delta, cursor),
TouchEventType::Up | TouchEventType::Cancel => {
self.on_scroll_window_event(delta, cursor);
},
TouchEventType::Down => {
self.on_scroll_window_event(delta, cursor);
},
}
}
fn on_scroll_window_event(&mut self, scroll_location: ScrollLocation, cursor: DeviceIntPoint) {
self.pending_scroll_zoom_events.push(ScrollZoomEvent {
magnification: 1.0,
scroll_location: scroll_location,
cursor: cursor,
event_count: 1,
});
}
fn process_pending_scroll_events(&mut self) {
let had_events = self.pending_scroll_zoom_events.len() > 0;
// Batch up all scroll events into one, or else we'll do way too much painting.
let mut last_combined_event: Option<ScrollZoomEvent> = None;
for scroll_event in self.pending_scroll_zoom_events.drain(..) {
let this_cursor = scroll_event.cursor;
let this_delta = match scroll_event.scroll_location {
ScrollLocation::Delta(delta) => delta,
ScrollLocation::Start | ScrollLocation::End => {
// If this is an event which is scrolling to the start or end of the page,
// disregard other pending events and exit the loop.
last_combined_event = Some(scroll_event);
break;
},
};
match &mut last_combined_event {
last_combined_event @ &mut None => {
*last_combined_event = Some(ScrollZoomEvent {
magnification: scroll_event.magnification,
scroll_location: ScrollLocation::Delta(LayoutVector2D::from_untyped(
this_delta.to_untyped(),
)),
cursor: this_cursor,
event_count: 1,
})
},
&mut Some(ref mut last_combined_event) => {
// Mac OS X sometimes delivers scroll events out of vsync during a
// fling. This causes events to get bunched up occasionally, causing
// nasty-looking "pops". To mitigate this, during a fling we average
// deltas instead of summing them.
if let ScrollLocation::Delta(delta) = last_combined_event.scroll_location {
let old_event_count = Scale::new(last_combined_event.event_count as f32);
last_combined_event.event_count += 1;
let new_event_count = Scale::new(last_combined_event.event_count as f32);
last_combined_event.scroll_location = ScrollLocation::Delta(
(delta * old_event_count + this_delta) / new_event_count,
);
}
last_combined_event.magnification *= scroll_event.magnification;
},
}
}
if let Some(combined_event) = last_combined_event {
let scroll_location = match combined_event.scroll_location {
ScrollLocation::Delta(delta) => {
let scaled_delta =
(Vector2D::from_untyped(delta.to_untyped()) / self.scale).to_untyped();
let calculated_delta = LayoutVector2D::from_untyped(scaled_delta);
ScrollLocation::Delta(calculated_delta)
},
// Leave ScrollLocation unchanged if it is Start or End location.
sl @ ScrollLocation::Start | sl @ ScrollLocation::End => sl,
};
let cursor = (combined_event.cursor.to_f32() / self.scale).to_untyped();
let cursor = WorldPoint::from_untyped(cursor);
let mut txn = webrender_api::Transaction::new();
txn.scroll(scroll_location, cursor);
if combined_event.magnification != 1.0 {
let old_zoom = self.pinch_zoom_level();
self.set_pinch_zoom_level(old_zoom * combined_event.magnification);
txn.set_pinch_zoom(webrender_api::ZoomFactor::new(self.pinch_zoom_level()));
}
txn.generate_frame();
self.webrender_api
.send_transaction(self.webrender_document, txn);
self.waiting_for_results_of_scroll = true
}
if had_events {
self.send_viewport_rects();
}
}
/// If there are any animations running, dispatches appropriate messages to the constellation.
fn process_animations(&mut self) {
let mut pipeline_ids = vec![];
for (pipeline_id, pipeline_details) in &self.pipeline_details {
if (pipeline_details.animations_running || pipeline_details.animation_callbacks_running) &&
pipeline_details.visible
{
pipeline_ids.push(*pipeline_id);
}
}
let animation_state = if pipeline_ids.is_empty() && !self.webxr_main_thread.running() {
windowing::AnimationState::Idle
} else {
windowing::AnimationState::Animating
};
self.window.set_animation_state(animation_state);
for pipeline_id in &pipeline_ids {
self.tick_animations_for_pipeline(*pipeline_id)
}
}
fn tick_animations_for_pipeline(&mut self, pipeline_id: PipelineId) {
let animation_callbacks_running = self
.pipeline_details(pipeline_id)
.animation_callbacks_running;
let animations_running = self.pipeline_details(pipeline_id).animations_running;
if !animation_callbacks_running && !animations_running {
return;
}
let mut tick_type = AnimationTickType::empty();
if animations_running {
tick_type.insert(AnimationTickType::CSS_ANIMATIONS_AND_TRANSITIONS);
}
if animation_callbacks_running {
tick_type.insert(AnimationTickType::REQUEST_ANIMATION_FRAME);
}
let msg = ConstellationMsg::TickAnimation(pipeline_id, tick_type);
if let Err(e) = self.constellation_chan.send(msg) {
warn!("Sending tick to constellation failed ({:?}).", e);
}
}
fn constrain_viewport(&mut self, pipeline_id: PipelineId, constraints: ViewportConstraints) {
let is_root = self.root_pipeline.id == Some(pipeline_id);
if is_root {
self.viewport_zoom = constraints.initial_zoom;
self.min_viewport_zoom = constraints.min_zoom;
self.max_viewport_zoom = constraints.max_zoom;
self.update_zoom_transform();
}
}
fn hidpi_factor(&self) -> Scale<f32, DeviceIndependentPixel, DevicePixel> {
if self.output_file.is_some() {
return Scale::new(1.0);
}
self.embedder_coordinates.hidpi_factor
}
fn device_pixels_per_page_px(&self) -> Scale<f32, CSSPixel, DevicePixel> {
self.page_zoom * self.hidpi_factor()
}
fn update_zoom_transform(&mut self) {
let scale = self.device_pixels_per_page_px();
self.scale = Scale::new(scale.get());
}
pub fn on_zoom_reset_window_event(&mut self) {
self.page_zoom = Scale::new(1.0);
self.update_zoom_transform();
self.send_window_size(WindowSizeType::Resize);
self.update_page_zoom_for_webrender();
}
pub fn on_zoom_window_event(&mut self, magnification: f32) {
self.page_zoom = Scale::new(
(self.page_zoom.get() * magnification)
.max(MIN_ZOOM)
.min(MAX_ZOOM),
);
self.update_zoom_transform();
self.send_window_size(WindowSizeType::Resize);
self.update_page_zoom_for_webrender();
}
fn update_page_zoom_for_webrender(&mut self) {
let page_zoom = webrender_api::ZoomFactor::new(self.page_zoom.get());
let mut txn = webrender_api::Transaction::new();
txn.set_page_zoom(page_zoom);
self.webrender_api
.send_transaction(self.webrender_document, txn);
}
/// Simulate a pinch zoom
pub fn on_pinch_zoom_window_event(&mut self, magnification: f32) {
self.pending_scroll_zoom_events.push(ScrollZoomEvent {
magnification: magnification,
scroll_location: ScrollLocation::Delta(Vector2D::zero()), // TODO: Scroll to keep the center in view?
cursor: Point2D::new(-1, -1), // Make sure this hits the base layer.
event_count: 1,
});
}
fn send_viewport_rects(&self) {
let mut scroll_states_per_pipeline = HashMap::new();
for scroll_layer_state in self
.webrender_api
.get_scroll_node_state(self.webrender_document)
{
let scroll_state = ScrollState {
scroll_id: scroll_layer_state.id,
scroll_offset: scroll_layer_state.scroll_offset,
};
scroll_states_per_pipeline
.entry(scroll_layer_state.id.pipeline_id())
.or_insert(vec![])
.push(scroll_state);
}
for (pipeline_id, scroll_states) in scroll_states_per_pipeline {
if let Some(pipeline) = self.pipeline(pipeline_id.from_webrender()) {
let msg = LayoutControlMsg::SetScrollStates(scroll_states);
let _ = pipeline.layout_chan.send(msg);
}
}
}
// Check if any pipelines currently have active animations or animation callbacks.
fn animations_active(&self) -> bool {
for (_, details) in &self.pipeline_details {
// If animations are currently running, then don't bother checking
// with the constellation if the output image is stable.
if details.animations_running {
return true;
}
if details.animation_callbacks_running {
return true;
}
}
false
}
/// Query the constellation to see if the current compositor
/// output matches the current frame tree output, and if the
/// associated script threads are idle.
fn is_ready_to_paint_image_output(&mut self) -> Result<(), NotReadyToPaint> {
match self.ready_to_save_state {
ReadyState::Unknown => {
// Unsure if the output image is stable.
// Collect the currently painted epoch of each pipeline that is
// complete (i.e. has *all* layers painted to the requested epoch).
// This gets sent to the constellation for comparison with the current
// frame tree.
let mut pipeline_epochs = HashMap::new();
for (id, _) in &self.pipeline_details {
let webrender_pipeline_id = id.to_webrender();
if let Some(webrender_api::Epoch(epoch)) = self
.webrender
.current_epoch(self.webrender_document, webrender_pipeline_id)
{
let epoch = Epoch(epoch);
pipeline_epochs.insert(*id, epoch);
}
}
// Pass the pipeline/epoch states to the constellation and check
// if it's safe to output the image.
let msg = ConstellationMsg::IsReadyToSaveImage(pipeline_epochs);
if let Err(e) = self.constellation_chan.send(msg) {
warn!("Sending ready to save to constellation failed ({:?}).", e);
}
self.ready_to_save_state = ReadyState::WaitingForConstellationReply;
Err(NotReadyToPaint::JustNotifiedConstellation)
},
ReadyState::WaitingForConstellationReply => {
// If waiting on a reply from the constellation to the last
// query if the image is stable, then assume not ready yet.
Err(NotReadyToPaint::WaitingOnConstellation)
},
ReadyState::ReadyToSaveImage => {
// Constellation has replied at some point in the past
// that the current output image is stable and ready
// for saving.
// Reset the flag so that we check again in the future
// TODO: only reset this if we load a new document?
if self.is_running_problem_test {
println!("was ready to save, resetting ready_to_save_state");
}
self.ready_to_save_state = ReadyState::Unknown;
Ok(())
},
}
}
pub fn composite(&mut self) {
let target = self.composite_target;
match self.composite_specific_target(target, None) {
Ok(_) => {
if self.output_file.is_some() || self.exit_after_load {
println!("Shutting down the Constellation after generating an output file or exit flag specified");
self.start_shutting_down();
}
},
Err(e) => {
if self.is_running_problem_test {
if e != UnableToComposite::NotReadyToPaintImage(
NotReadyToPaint::WaitingOnConstellation,
) {
println!("not ready to composite: {:?}", e);
}
}
},
}
}
/// Composite either to the screen or to a png image or both.
/// Returns Ok if composition was performed or Err if it was not possible to composite
/// for some reason. If CompositeTarget is Window or Png no image data is returned;
/// in the latter case the image is written directly to a file. If CompositeTarget
/// is WindowAndPng Ok(Some(png::Image)) is returned.
fn composite_specific_target(
&mut self,
target: CompositeTarget,
rect: Option<Rect<f32, CSSPixel>>,
) -> Result<Option<Image>, UnableToComposite> {
let size = self.embedder_coordinates.framebuffer.to_u32();
if let Err(err) = self.webrender_surfman.make_gl_context_current() {
warn!("Failed to make GL context current: {:?}", err);
}
self.assert_no_gl_error();
// Bind the webrender framebuffer
let framebuffer_object = self
.webrender_surfman
.context_surface_info()
.unwrap_or(None)
.map(|info| info.framebuffer_object)
.unwrap_or(0);
self.webrender_gl
.bind_framebuffer(gleam::gl::FRAMEBUFFER, framebuffer_object);
self.assert_gl_framebuffer_complete();
self.webrender.update();
let wait_for_stable_image = match target {
CompositeTarget::WindowAndPng | CompositeTarget::PngFile => true,
CompositeTarget::Window => self.exit_after_load,
};
if wait_for_stable_image {
// The current image may be ready to output. However, if there are animations active,
// tick those instead and continue waiting for the image output to be stable AND
// all active animations to complete.
if self.animations_active() {
self.process_animations();
return Err(UnableToComposite::NotReadyToPaintImage(
NotReadyToPaint::AnimationsActive,
));
}
if let Err(result) = self.is_ready_to_paint_image_output() {
return Err(UnableToComposite::NotReadyToPaintImage(result));
}
}
let rt_info = match target {
#[cfg(feature = "gl")]
CompositeTarget::Window => gl::RenderTargetInfo::default(),
#[cfg(feature = "gl")]
CompositeTarget::WindowAndPng | CompositeTarget::PngFile => gl::initialize_png(
&*self.webrender_gl,
FramebufferUintLength::new(size.width),
FramebufferUintLength::new(size.height),
),
#[cfg(not(feature = "gl"))]
_ => (),
};
profile(
ProfilerCategory::Compositing,
None,
self.time_profiler_chan.clone(),
|| {
debug!("compositor: compositing");
let size =
DeviceIntSize::from_untyped(self.embedder_coordinates.framebuffer.to_untyped());
// Paint the scene.
// TODO(gw): Take notice of any errors the renderer returns!
self.clear_background();
self.webrender.render(size).ok();
},
);
// If there are pending paint metrics, we check if any of the painted epochs is
// one of the ones that the paint metrics recorder is expecting . In that case,
// we get the current time, inform the layout thread about it and remove the
// pending metric from the list.
if !self.pending_paint_metrics.is_empty() {
let paint_time = precise_time_ns();
let mut to_remove = Vec::new();
// For each pending paint metrics pipeline id
for (id, pending_epoch) in &self.pending_paint_metrics {
// we get the last painted frame id from webrender
if let Some(webrender_api::Epoch(epoch)) = self
.webrender
.current_epoch(self.webrender_document, id.to_webrender())
{
// and check if it is the one the layout thread is expecting,
let epoch = Epoch(epoch);
if *pending_epoch != epoch {
continue;
}
// in which case, we remove it from the list of pending metrics,
to_remove.push(id.clone());
if let Some(pipeline) = self.pipeline(*id) {
// and inform the layout thread with the measured paint time.
let msg = LayoutControlMsg::PaintMetric(epoch, paint_time);
if let Err(e) = pipeline.layout_chan.send(msg) {
warn!("Sending PaintMetric message to layout failed ({:?}).", e);
}
}
}
}
for id in to_remove.iter() {
self.pending_paint_metrics.remove(id);
}
}
let (x, y, width, height) = match rect {
Some(rect) => {
let rect = self.device_pixels_per_page_px().transform_rect(&rect);
let x = rect.origin.x as i32;
// We need to convert to the bottom-left origin coordinate
// system used by OpenGL
let y = (size.height as f32 - rect.origin.y - rect.size.height) as i32;
let w = rect.size.width as u32;
let h = rect.size.height as u32;
(x, y, w, h)
},
None => (0, 0, size.width, size.height),
};
let rv = match target {
CompositeTarget::Window => None,
#[cfg(feature = "gl")]
CompositeTarget::WindowAndPng => {
let img = gl::draw_img(
&*self.webrender_gl,
rt_info,
x,
y,
FramebufferUintLength::new(width),
FramebufferUintLength::new(height),
);
Some(Image {
width: img.width(),
height: img.height(),
format: PixelFormat::RGB8,
bytes: ipc::IpcSharedMemory::from_bytes(&*img),
id: None,
cors_status: CorsStatus::Safe,
})
},
#[cfg(feature = "gl")]
CompositeTarget::PngFile => {
let gl = &*self.webrender_gl;
profile(
ProfilerCategory::ImageSaving,
None,
self.time_profiler_chan.clone(),
|| match self.output_file.as_ref() {
Some(path) => match File::create(path) {
Ok(mut file) => {
let img = gl::draw_img(
gl,
rt_info,
x,
y,
FramebufferUintLength::new(width),
FramebufferUintLength::new(height),
);
let dynamic_image = DynamicImage::ImageRgb8(img);
if let Err(e) = dynamic_image.write_to(&mut file, ImageFormat::Png)
{
error!("Failed to save {} ({}).", path, e);
}
},
Err(e) => error!("Failed to create {} ({}).", path, e),
},
None => error!("No file specified."),
},
);
None
},
#[cfg(not(feature = "gl"))]
_ => None,
};
// Perform the page flip. This will likely block for a while.
if let Err(err) = self.webrender_surfman.present() {
warn!("Failed to present surface: {:?}", err);
}
self.composition_request = CompositionRequest::NoCompositingNecessary;
self.process_animations();
self.waiting_for_results_of_scroll = false;
Ok(rv)
}
fn composite_if_necessary(&mut self, reason: CompositingReason) {
if self.composition_request == CompositionRequest::NoCompositingNecessary {
if self.is_running_problem_test {
println!("updating composition_request ({:?})", reason);
}
self.composition_request = CompositionRequest::CompositeNow(reason)
} else if self.is_running_problem_test {
println!(
"composition_request is already {:?}",
self.composition_request
);
}
}
fn clear_background(&self) {
let gl = &self.webrender_gl;
self.assert_gl_framebuffer_complete();
// Make framebuffer fully transparent.
gl.clear_color(0.0, 0.0, 0.0, 0.0);
gl.clear(gleam::gl::COLOR_BUFFER_BIT);
self.assert_gl_framebuffer_complete();
// Make the viewport white.
let viewport = self.embedder_coordinates.get_flipped_viewport();
gl.scissor(
viewport.origin.x,
viewport.origin.y,
viewport.size.width,
viewport.size.height,
);
gl.clear_color(1.0, 1.0, 1.0, 1.0);
gl.enable(gleam::gl::SCISSOR_TEST);
gl.clear(gleam::gl::COLOR_BUFFER_BIT);
gl.disable(gleam::gl::SCISSOR_TEST);
self.assert_gl_framebuffer_complete();
}
#[track_caller]
fn assert_no_gl_error(&self) {
debug_assert_eq!(self.webrender_gl.get_error(), gleam::gl::NO_ERROR);
}
#[track_caller]
fn assert_gl_framebuffer_complete(&self) {
debug_assert_eq!(
(
self.webrender_gl.get_error(),
self.webrender_gl
.check_frame_buffer_status(gleam::gl::FRAMEBUFFER)
),
(gleam::gl::NO_ERROR, gleam::gl::FRAMEBUFFER_COMPLETE)
);
}
pub fn receive_messages(&mut self) -> bool {
// Check for new messages coming from the other threads in the system.
let mut compositor_messages = vec![];
let mut found_recomposite_msg = false;
while let Some(msg) = self.port.try_recv_compositor_msg() {
match msg {
Msg::Recomposite(_) if found_recomposite_msg => {},
Msg::Recomposite(_) => {
found_recomposite_msg = true;
compositor_messages.push(msg)
},
_ => compositor_messages.push(msg),
}
}
for msg in compositor_messages {
if !self.handle_browser_message(msg) {
return false;
}
}
true
}
pub fn perform_updates(&mut self) -> bool {
if self.shutdown_state == ShutdownState::FinishedShuttingDown {
return false;
}
// If a pinch-zoom happened recently, ask for tiles at the new resolution
if self.zoom_action && precise_time_s() - self.zoom_time > 0.3 {
self.zoom_action = false;
}
match self.composition_request {
CompositionRequest::NoCompositingNecessary => {},
CompositionRequest::CompositeNow(_) => self.composite(),
}
// Run the WebXR main thread
self.webxr_main_thread.run_one_frame();
// The WebXR thread may make a different context current
let _ = self.webrender_surfman.make_gl_context_current();
if !self.pending_scroll_zoom_events.is_empty() && !self.waiting_for_results_of_scroll {
self.process_pending_scroll_events()
}
self.shutdown_state != ShutdownState::FinishedShuttingDown
}
/// Repaints and recomposites synchronously. You must be careful when calling this, as if a
/// paint is not scheduled the compositor will hang forever.
///
/// This is used when resizing the window.
pub fn repaint_synchronously(&mut self) {
while self.shutdown_state != ShutdownState::ShuttingDown {
let msg = self.port.recv_compositor_msg();
let need_recomposite = match msg {
Msg::Recomposite(_) => true,
_ => false,
};
let keep_going = self.handle_browser_message(msg);
if need_recomposite {
self.composite();
break;
}
if !keep_going {
break;
}
}
}
pub fn pinch_zoom_level(&self) -> f32 {
self.viewport_zoom.get()
}
fn set_pinch_zoom_level(&mut self, mut zoom: f32) {
if let Some(min) = self.min_viewport_zoom {
zoom = f32::max(min.get(), zoom);
}
if let Some(max) = self.max_viewport_zoom {
zoom = f32::min(max.get(), zoom);
}
self.viewport_zoom = PinchZoomFactor::new(zoom);
}
pub fn toggle_webrender_debug(&mut self, option: WebRenderDebugOption) {
let mut flags = self.webrender.get_debug_flags();
let flag = match option {
WebRenderDebugOption::Profiler => {
webrender::DebugFlags::PROFILER_DBG |
webrender::DebugFlags::GPU_TIME_QUERIES |
webrender::DebugFlags::GPU_SAMPLE_QUERIES
},
WebRenderDebugOption::TextureCacheDebug => webrender::DebugFlags::TEXTURE_CACHE_DBG,
WebRenderDebugOption::RenderTargetDebug => webrender::DebugFlags::RENDER_TARGET_DBG,
};
flags.toggle(flag);
self.webrender.set_debug_flags(flags);
let mut txn = webrender_api::Transaction::new();
txn.generate_frame();
self.webrender_api
.send_transaction(self.webrender_document, txn);
}
pub fn capture_webrender(&mut self) {
let capture_id = now().to_timespec().sec.to_string();
let available_path = [env::current_dir(), Ok(env::temp_dir())]
.iter()
.filter_map(|val| {
val.as_ref()
.map(|dir| dir.join("capture_webrender").join(&capture_id))
.ok()
})
.find(|val| match create_dir_all(&val) {
Ok(_) => true,
Err(err) => {
eprintln!("Unable to create path '{:?}' for capture: {:?}", &val, err);
false
},
});
match available_path {
Some(capture_path) => {
let revision_file_path = capture_path.join("wr.txt");
debug!(
"Trying to save webrender capture under {:?}",
&revision_file_path
);
self.webrender_api
.save_capture(capture_path, webrender_api::CaptureBits::all());
match File::create(revision_file_path) {
Ok(mut file) => {
let revision = include!(concat!(env!("OUT_DIR"), "/webrender_revision.rs"));
if let Err(err) = write!(&mut file, "{}", revision) {
eprintln!("Unable to write webrender revision: {:?}", err)
}
},
Err(err) => eprintln!(
"Capture triggered, creating webrender revision info skipped: {:?}",
err
),
}
},
None => eprintln!("Unable to locate path to save captures"),
}
}
}
/// Why we performed a composite. This is used for debugging.
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum CompositingReason {
/// We hit the delayed composition timeout. (See `delayed_composition.rs`.)
DelayedCompositeTimeout,
/// The window has been scrolled and we're starting the first recomposite.
Scroll,
/// A scroll has continued and we need to recomposite again.
ContinueScroll,
/// We're performing the single composite in headless mode.
Headless,
/// We're performing a composite to run an animation.
Animation,
/// A new frame tree has been loaded.
NewFrameTree,
/// New painted buffers have been received.
NewPaintedBuffers,
/// The window has been zoomed.
Zoom,
/// A new WebRender frame has arrived.
NewWebRenderFrame,
/// WebRender has processed a scroll event and has generated a new frame.
NewWebRenderScrollFrame,
/// The window has been resized and will need to be synchronously repainted.
Resize,
}
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