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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/. */
use dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding;
use dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding::CanvasRenderingContext2DMethods;
use dom::bindings::global::{GlobalRef, GlobalField};
use dom::bindings::js::{JSRef, Temporary};
use dom::bindings::trace::Untraceable;
use dom::bindings::utils::{Reflector, Reflectable, reflect_dom_object};
use azure::azure_hl::{DrawTarget, Color, B8G8R8A8, SkiaBackend, StrokeOptions, DrawOptions};
use azure::azure_hl::ColorPattern;
use geom::point::Point2D;
use geom::rect::Rect;
use geom::size::Size2D;
use std::comm;
use std::task::TaskBuilder;
#[deriving(Encodable)]
pub struct CanvasRenderingContext2D {
reflector_: Reflector,
global: GlobalField,
renderer: Untraceable<Sender<CanvasMsg>>,
}
enum CanvasMsg {
FillRect(Rect<f32>),
ClearRect(Rect<f32>),
StrokeRect(Rect<f32>),
Recreate(Size2D<i32>),
Close,
}
struct CanvasRenderTask {
drawtarget: DrawTarget,
fill_color: ColorPattern,
stroke_color: ColorPattern,
stroke_opts: StrokeOptions,
}
impl CanvasRenderTask {
fn new(size: Size2D<i32>) -> CanvasRenderTask {
CanvasRenderTask {
drawtarget: CanvasRenderTask::create(size),
fill_color: ColorPattern::new(Color::new(0., 0., 0., 1.)),
stroke_color: ColorPattern::new(Color::new(0., 0., 0., 1.)),
stroke_opts: StrokeOptions::new(1.0, 1.0),
}
}
fn start(size: Size2D<i32>) -> Sender<CanvasMsg> {
let (chan, port) = comm::channel::<CanvasMsg>();
let builder = TaskBuilder::new().named("CanvasTask");
builder.spawn(proc() {
let mut renderer = CanvasRenderTask::new(size);
loop {
match port.recv() {
FillRect(ref rect) => renderer.fill_rect(rect),
StrokeRect(ref rect) => renderer.stroke_rect(rect),
ClearRect(ref rect) => renderer.clear_rect(rect),
Recreate(size) => renderer.recreate(size),
Close => break,
}
}
});
chan
}
fn fill_rect(&self, rect: &Rect<f32>) {
let drawopts = DrawOptions::new(1.0, 0);
self.drawtarget.fill_rect(rect, &self.fill_color, Some(&drawopts));
}
fn clear_rect(&self, rect: &Rect<f32>) {
self.drawtarget.clear_rect(rect);
}
fn stroke_rect(&self, rect: &Rect<f32>) {
let drawopts = DrawOptions::new(1.0, 0);
self.drawtarget.stroke_rect(rect, &self.stroke_color, &self.stroke_opts, &drawopts);
}
fn create(size: Size2D<i32>) -> DrawTarget {
DrawTarget::new(SkiaBackend, size, B8G8R8A8)
}
fn recreate(&mut self, size: Size2D<i32>) {
self.drawtarget = CanvasRenderTask::create(size);
}
}
impl CanvasRenderingContext2D {
pub fn new_inherited(global: &GlobalRef, size: Size2D<i32>) -> CanvasRenderingContext2D {
CanvasRenderingContext2D {
reflector_: Reflector::new(),
global: GlobalField::from_rooted(global),
renderer: Untraceable::new(CanvasRenderTask::start(size)),
}
}
pub fn new(global: &GlobalRef, size: Size2D<i32>) -> Temporary<CanvasRenderingContext2D> {
reflect_dom_object(box CanvasRenderingContext2D::new_inherited(global, size),
global, CanvasRenderingContext2DBinding::Wrap)
}
pub fn recreate(&self, size: Size2D<i32>) {
self.renderer.send(Recreate(size));
}
}
impl<'a> CanvasRenderingContext2DMethods for JSRef<'a, CanvasRenderingContext2D> {
fn FillRect(&self, x: f64, y: f64, width: f64, height: f64) {
let rect = Rect(Point2D(x as f32, y as f32), Size2D(width as f32, height as f32));
self.renderer.send(FillRect(rect));
}
fn ClearRect(&self, x: f64, y: f64, width: f64, height: f64) {
let rect = Rect(Point2D(x as f32, y as f32), Size2D(width as f32, height as f32));
self.renderer.send(ClearRect(rect));
}
fn StrokeRect(&self, x: f64, y: f64, width: f64, height: f64) {
let rect = Rect(Point2D(x as f32, y as f32), Size2D(width as f32, height as f32));
self.renderer.send(StrokeRect(rect));
}
}
impl Reflectable for CanvasRenderingContext2D {
fn reflector<'a>(&'a self) -> &'a Reflector {
&self.reflector_
}
}
#[unsafe_destructor]
impl Drop for CanvasRenderingContext2D {
fn drop(&mut self) {
self.renderer.send(Close);
}
}
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