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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 canvas_traits::{CanvasCommonMsg, CanvasMsg, CanvasPixelData, CanvasData, CanvasWebGLMsg, FromLayoutMsg};
use euclid::size::Size2D;
use gleam::gl;
use ipc_channel::ipc::{self, IpcSender, IpcSharedMemory};
use ipc_channel::router::ROUTER;
use offscreen_gl_context::{ColorAttachmentType, GLContext, GLContextAttributes, NativeGLContext};
use std::borrow::ToOwned;
use std::sync::mpsc::channel;
use util::thread::spawn_named;
use util::vec::byte_swap;
use webrender_traits;
enum WebGLPaintTaskData {
WebRender(webrender_traits::RenderApi, webrender_traits::WebGLContextId),
Servo(GLContext<NativeGLContext>),
}
pub struct WebGLPaintThread {
size: Size2D<i32>,
data: WebGLPaintTaskData,
}
impl WebGLPaintThread {
fn new(size: Size2D<i32>,
attrs: GLContextAttributes,
webrender_api_sender: Option<webrender_traits::RenderApiSender>) -> Result<WebGLPaintThread, String> {
let data = if let Some(sender) = webrender_api_sender {
let webrender_api = sender.create_api();
let id = try!(webrender_api.request_webgl_context(&size, attrs));
WebGLPaintTaskData::WebRender(webrender_api, id)
} else {
let context = try!(GLContext::<NativeGLContext>::new(size, attrs, ColorAttachmentType::Texture, None));
WebGLPaintTaskData::Servo(context)
};
Ok(WebGLPaintThread {
size: size,
data: data,
})
}
pub fn handle_webgl_message(&self, message: CanvasWebGLMsg) {
debug!("WebGL message: {:?}", message);
match self.data {
WebGLPaintTaskData::WebRender(ref api, id) => {
api.send_webgl_command(id, message);
}
WebGLPaintTaskData::Servo(ref ctx) => {
message.apply(ctx);
}
}
}
/// Creates a new `WebGLPaintThread` and returns the out-of-process sender and the in-process
/// sender for it.
pub fn start(size: Size2D<i32>,
attrs: GLContextAttributes,
webrender_api_sender: Option<webrender_traits::RenderApiSender>)
-> Result<IpcSender<CanvasMsg>, String> {
let (in_process_chan, in_process_port) = channel();
let (result_chan, result_port) = channel();
spawn_named("WebGLThread".to_owned(), move || {
let mut painter = match WebGLPaintThread::new(size, attrs, webrender_api_sender) {
Ok(thread) => {
result_chan.send(Ok(())).unwrap();
thread
},
Err(e) => {
result_chan.send(Err(e)).unwrap();
return
}
};
painter.init();
loop {
match in_process_port.recv().unwrap() {
CanvasMsg::WebGL(message) => painter.handle_webgl_message(message),
CanvasMsg::Common(message) => {
match message {
CanvasCommonMsg::Close => break,
// TODO(ecoal95): handle error nicely
CanvasCommonMsg::Recreate(size) => painter.recreate(size).unwrap(),
}
},
CanvasMsg::FromLayout(message) => {
match message {
FromLayoutMsg::SendData(chan) =>
painter.send_data(chan),
}
}
CanvasMsg::Canvas2d(_) => panic!("Wrong message sent to WebGLThread"),
}
}
});
result_port.recv().unwrap().map(|_| {
let (out_of_process_chan, out_of_process_port) = ipc::channel::<CanvasMsg>().unwrap();
ROUTER.route_ipc_receiver_to_mpsc_sender(out_of_process_port, in_process_chan);
out_of_process_chan
})
}
fn send_data(&mut self, chan: IpcSender<CanvasData>) {
match self.data {
WebGLPaintTaskData::Servo(_) => {
let width = self.size.width as usize;
let height = self.size.height as usize;
let mut pixels = gl::read_pixels(0, 0,
self.size.width as gl::GLsizei,
self.size.height as gl::GLsizei,
gl::RGBA, gl::UNSIGNED_BYTE);
// flip image vertically (texture is upside down)
let orig_pixels = pixels.clone();
let stride = width * 4;
for y in 0..height {
let dst_start = y * stride;
let src_start = (height - y - 1) * stride;
let src_slice = &orig_pixels[src_start .. src_start + stride];
(&mut pixels[dst_start .. dst_start + stride]).clone_from_slice(&src_slice[..stride]);
}
// rgba -> bgra
byte_swap(&mut pixels);
let pixel_data = CanvasPixelData {
image_data: IpcSharedMemory::from_bytes(&pixels[..]),
image_key: None,
};
chan.send(CanvasData::Pixels(pixel_data)).unwrap();
}
WebGLPaintTaskData::WebRender(_, id) => {
chan.send(CanvasData::WebGL(id)).unwrap();
}
}
}
#[allow(unsafe_code)]
fn recreate(&mut self, size: Size2D<i32>) -> Result<(), &'static str> {
match self.data {
WebGLPaintTaskData::Servo(ref mut context) => {
if size.width > self.size.width ||
size.height > self.size.height {
try!(context.resize(size));
self.size = context.borrow_draw_buffer().unwrap().size();
} else {
self.size = size;
unsafe { gl::Scissor(0, 0, size.width, size.height); }
}
}
WebGLPaintTaskData::WebRender(_, _) => {
// TODO
}
}
Ok(())
}
fn init(&mut self) {
if let WebGLPaintTaskData::Servo(ref context) = self.data {
context.make_current().unwrap();
}
}
}
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