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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 http://mozilla.org/MPL/2.0/. */
#![feature(custom_derive, plugin)]
#![plugin(heapsize_plugin, plugins, serde_macros)]
#![crate_name = "gfx_traits"]
#![crate_type = "rlib"]
#![deny(unsafe_code)]
extern crate azure;
extern crate euclid;
extern crate heapsize;
extern crate layers;
extern crate msg;
extern crate serde;
extern crate util;
pub mod color;
mod paint_listener;
pub use paint_listener::PaintListener;
use azure::azure_hl::Color;
use euclid::Matrix4D;
use euclid::rect::Rect;
use msg::constellation_msg::{Failure, PipelineId};
use std::fmt::{self, Debug, Formatter};
/// Messages from the paint task to the constellation.
#[derive(Deserialize, Serialize)]
pub enum PaintMsg {
Failure(Failure),
}
impl From<Failure> for PaintMsg {
fn from(failure: Failure) -> PaintMsg {
PaintMsg::Failure(failure)
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum LayerKind {
NoTransform,
HasTransform,
}
#[derive(Clone, PartialEq, Eq, Copy, Hash, Deserialize, Serialize, HeapSizeOf)]
pub enum LayerType {
/// A layer for the fragment body itself.
FragmentBody,
/// An extra layer created for a DOM fragments with overflow:scroll.
OverflowScroll,
/// A layer created to contain ::before pseudo-element content.
BeforePseudoContent,
/// A layer created to contain ::after pseudo-element content.
AfterPseudoContent,
}
/// The scrolling policy of a layer.
#[derive(Clone, PartialEq, Eq, Copy, Deserialize, Serialize, Debug, HeapSizeOf)]
pub enum ScrollPolicy {
/// These layers scroll when the parent receives a scrolling message.
Scrollable,
/// These layers do not scroll when the parent receives a scrolling message.
FixedPosition,
}
#[derive(Clone, PartialEq, Eq, Copy, Hash, Deserialize, Serialize, HeapSizeOf)]
pub struct LayerId(
/// The type of the layer. This serves to differentiate layers that share fragments.
LayerType,
/// The identifier for this layer's fragment, derived from the fragment memory address.
usize,
/// An index for identifying companion layers, synthesized to ensure that
/// content on top of this layer's fragment has the proper rendering order.
usize
);
impl Debug for LayerId {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
let LayerId(layer_type, id, companion) = *self;
let type_string = match layer_type {
LayerType::FragmentBody => "-FragmentBody",
LayerType::OverflowScroll => "-OverflowScroll",
LayerType::BeforePseudoContent => "-BeforePseudoContent",
LayerType::AfterPseudoContent => "-AfterPseudoContent",
};
write!(f, "{}{}-{}", id, type_string, companion)
}
}
impl LayerId {
/// FIXME(#2011, pcwalton): This is unfortunate. Maybe remove this in the future.
pub fn null() -> LayerId {
LayerId(LayerType::FragmentBody, 0, 0)
}
pub fn new_of_type(layer_type: LayerType, fragment_id: usize) -> LayerId {
LayerId(layer_type, fragment_id, 0)
}
pub fn companion_layer_id(&self) -> LayerId {
let LayerId(layer_type, id, companion) = *self;
LayerId(layer_type, id, companion + 1)
}
pub fn original(&self) -> LayerId {
let LayerId(layer_type, id, _) = *self;
LayerId(layer_type, id, 0)
}
pub fn kind(&self) -> LayerType {
self.0
}
}
/// All layer-specific information that the painting task sends to the compositor other than the
/// buffer contents of the layer itself.
#[derive(Copy, Clone, HeapSizeOf)]
pub struct LayerProperties {
/// An opaque ID. This is usually the address of the flow and index of the box within it.
pub id: LayerId,
/// The id of the parent layer.
pub parent_id: Option<LayerId>,
/// The position and size of the layer in pixels.
pub rect: Rect<f32>,
/// The background color of the layer.
pub background_color: Color,
/// The scrolling policy of this layer.
pub scroll_policy: ScrollPolicy,
/// The transform for this layer
pub transform: Matrix4D<f32>,
/// The perspective transform for this layer
pub perspective: Matrix4D<f32>,
/// The subpage that this layer represents. If this is `Some`, this layer represents an
/// iframe.
pub subpage_pipeline_id: Option<PipelineId>,
/// Whether this layer establishes a new 3d rendering context.
pub establishes_3d_context: bool,
/// Whether this layer scrolls its overflow area.
pub scrolls_overflow_area: bool,
}
/// A newtype struct for denoting the age of messages; prevents race conditions.
#[derive(PartialEq, Eq, Debug, Copy, Clone, PartialOrd, Ord, Deserialize, Serialize)]
pub struct Epoch(pub u32);
impl Epoch {
pub fn next(&mut self) {
self.0 += 1;
}
}
#[derive(PartialEq, Eq, Debug, Copy, Clone)]
pub struct FrameTreeId(pub u32);
impl FrameTreeId {
pub fn next(&mut self) {
self.0 += 1;
}
}
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