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https://github.com/servo/servo.git
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121 lines
4.3 KiB
Rust
121 lines
4.3 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use azure::azure_hl::Color;
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use constellation_msg::{Key, KeyState, KeyModifiers};
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use geom::point::Point2D;
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use geom::rect::Rect;
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use layers::platform::surface::NativeGraphicsMetadata;
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use layers::layers::LayerBufferSet;
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use std::fmt::{Formatter, Debug};
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use std::fmt;
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use constellation_msg::PipelineId;
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/// The status of the painter.
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#[derive(PartialEq, Eq, Clone, Copy)]
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pub enum PaintState {
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Idle,
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Painting,
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}
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#[derive(Eq, Ord, PartialEq, PartialOrd, Clone, Debug, Copy)]
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pub enum ReadyState {
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/// Informs the compositor that nothing has been done yet. Used for setting status
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Blank,
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/// Informs the compositor that a page is loading. Used for setting status
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Loading,
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/// Informs the compositor that a page is performing layout. Used for setting status
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PerformingLayout,
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/// Informs the compositor that a page is finished loading. Used for setting status
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FinishedLoading,
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}
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/// A newtype struct for denoting the age of messages; prevents race conditions.
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#[derive(PartialEq, Eq, Debug, Copy)]
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pub struct Epoch(pub uint);
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impl Epoch {
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pub fn next(&mut self) {
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let Epoch(ref mut u) = *self;
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*u += 1;
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}
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}
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#[derive(Clone, PartialEq, Eq, Copy)]
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pub struct LayerId(pub uint, pub uint);
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impl Debug for LayerId {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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let LayerId(a, b) = *self;
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write!(f, "Layer({}, {})", a, b)
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}
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}
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impl LayerId {
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/// FIXME(#2011, pcwalton): This is unfortunate. Maybe remove this in the future.
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pub fn null() -> LayerId {
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LayerId(0, 0)
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}
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}
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/// The scrolling policy of a layer.
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#[derive(Clone, PartialEq, Eq, Copy)]
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pub enum ScrollPolicy {
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/// These layers scroll when the parent receives a scrolling message.
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Scrollable,
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/// These layers do not scroll when the parent receives a scrolling message.
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FixedPosition,
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}
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/// All layer-specific information that the painting task sends to the compositor other than the
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/// buffer contents of the layer itself.
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#[derive(Copy)]
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pub struct LayerMetadata {
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/// An opaque ID. This is usually the address of the flow and index of the box within it.
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pub id: LayerId,
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/// The position and size of the layer in pixels.
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pub position: Rect<i32>,
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/// The background color of the layer.
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pub background_color: Color,
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/// The scrolling policy of this layer.
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pub scroll_policy: ScrollPolicy,
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}
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/// The interface used by the painter to acquire draw targets for each paint frame and
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/// submit them to be drawn to the display.
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pub trait PaintListener {
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fn get_graphics_metadata(&mut self) -> Option<NativeGraphicsMetadata>;
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/// Informs the compositor of the layers for the given pipeline. The compositor responds by
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/// creating and/or destroying paint layers as necessary.
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fn initialize_layers_for_pipeline(&mut self,
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pipeline_id: PipelineId,
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metadata: Vec<LayerMetadata>,
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epoch: Epoch);
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/// Sends new buffers for the given layers to the compositor.
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fn assign_painted_buffers(&mut self,
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pipeline_id: PipelineId,
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epoch: Epoch,
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replies: Vec<(LayerId, Box<LayerBufferSet>)>);
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fn paint_msg_discarded(&mut self);
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fn set_paint_state(&mut self, PipelineId, PaintState);
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}
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/// The interface used by the script task to tell the compositor to update its ready state,
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/// which is used in displaying the appropriate message in the window's title.
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pub trait ScriptListener {
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fn set_ready_state(&mut self, PipelineId, ReadyState);
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fn scroll_fragment_point(&mut self,
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pipeline_id: PipelineId,
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layer_id: LayerId,
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point: Point2D<f32>);
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/// Informs the compositor that the title of the page with the given pipeline ID has changed.
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fn set_title(&mut self, pipeline_id: PipelineId, new_title: Option<String>);
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fn close(&mut self);
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fn dup(&mut self) -> Box<ScriptListener+'static>;
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fn send_key_event(&mut self, key: Key, state: KeyState, modifiers: KeyModifiers);
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}
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