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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 azure::azure_hl::{DrawTarget, Color, SurfaceFormat, BackendType, StrokeOptions, DrawOptions};
use azure::azure_hl::{ColorPattern, PatternRef};
use geom::rect::Rect;
use geom::size::Size2D;
use servo_util::task::spawn_named;
use std::borrow::ToOwned;
use std::sync::mpsc::{channel, Sender};
#[derive(Clone)]
pub enum CanvasMsg {
FillRect(Rect<f32>),
ClearRect(Rect<f32>),
StrokeRect(Rect<f32>),
Recreate(Size2D<i32>),
SendPixelContents(Sender<Vec<u8>>),
Close,
}
pub struct CanvasPaintTask {
drawtarget: DrawTarget,
fill_color: ColorPattern,
stroke_color: ColorPattern,
stroke_opts: StrokeOptions,
}
impl CanvasPaintTask {
fn new(size: Size2D<i32>) -> CanvasPaintTask {
CanvasPaintTask {
drawtarget: CanvasPaintTask::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),
}
}
pub fn start(size: Size2D<i32>) -> Sender<CanvasMsg> {
let (chan, port) = channel::<CanvasMsg>();
spawn_named("CanvasTask".to_owned(), move || {
let mut painter = CanvasPaintTask::new(size);
loop {
match port.recv().unwrap() {
CanvasMsg::FillRect(ref rect) => painter.fill_rect(rect),
CanvasMsg::StrokeRect(ref rect) => painter.stroke_rect(rect),
CanvasMsg::ClearRect(ref rect) => painter.clear_rect(rect),
CanvasMsg::Recreate(size) => painter.recreate(size),
CanvasMsg::SendPixelContents(chan) => painter.send_pixel_contents(chan),
CanvasMsg::Close => break,
}
}
});
chan
}
fn fill_rect(&self, rect: &Rect<f32>) {
let drawopts = DrawOptions::new(1.0, 0);
self.drawtarget.fill_rect(rect, PatternRef::Color(&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(BackendType::Skia, size, SurfaceFormat::B8G8R8A8)
}
fn recreate(&mut self, size: Size2D<i32>) {
self.drawtarget = CanvasPaintTask::create(size);
}
fn send_pixel_contents(&mut self, chan: Sender<Vec<u8>>) {
self.drawtarget.snapshot().get_data_surface().with_data(|element| {
chan.send(element.to_vec()).unwrap();
})
}
}
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