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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 https://mozilla.org/MPL/2.0/. */
use crate::dom::bindings::cell::DomRefCell;
use crate::dom::bindings::codegen::Bindings::OffscreenCanvasBinding::{
OffscreenCanvasMethods, OffscreenRenderingContext, Wrap as OffscreenCanvasWrap,
};
use crate::dom::bindings::error::Fallible;
use crate::dom::bindings::reflector::reflect_dom_object;
use crate::dom::bindings::reflector::DomObject;
use crate::dom::bindings::root::{Dom, DomRoot};
use crate::dom::bindings::str::DOMString;
use crate::dom::eventtarget::EventTarget;
use crate::dom::globalscope::GlobalScope;
use crate::dom::htmlcanvaselement::HTMLCanvasElement;
use crate::dom::offscreencanvasrenderingcontext2d::OffscreenCanvasRenderingContext2D;
use dom_struct::dom_struct;
use euclid::Size2D;
use js::jsapi::JSContext;
use js::rust::HandleValue;
use ref_filter_map;
use std::cell::Cell;
use std::cell::Ref;
#[must_root]
#[derive(Clone, JSTraceable, MallocSizeOf)]
pub enum OffscreenCanvasContext {
OffscreenContext2d(Dom<OffscreenCanvasRenderingContext2D>),
//WebGL(Dom<WebGLRenderingContext>),
//WebGL2(Dom<WebGL2RenderingContext>),
}
#[dom_struct]
pub struct OffscreenCanvas {
eventtarget: EventTarget,
height: Cell<u64>,
width: Cell<u64>,
context: DomRefCell<Option<OffscreenCanvasContext>>,
placeholder: Option<Dom<HTMLCanvasElement>>,
}
impl OffscreenCanvas {
pub fn new_inherited(
height: u64,
width: u64,
placeholder: Option<&HTMLCanvasElement>,
) -> OffscreenCanvas {
OffscreenCanvas {
eventtarget: EventTarget::new_inherited(),
height: Cell::new(height),
width: Cell::new(width),
context: DomRefCell::new(None),
placeholder: placeholder.map(Dom::from_ref),
}
}
pub fn new(
global: &GlobalScope,
height: u64,
width: u64,
placeholder: Option<&HTMLCanvasElement>,
) -> DomRoot<OffscreenCanvas> {
reflect_dom_object(
Box::new(OffscreenCanvas::new_inherited(height, width, placeholder)),
global,
OffscreenCanvasWrap,
)
}
pub fn Constructor(
global: &GlobalScope,
height: u64,
width: u64,
) -> Fallible<DomRoot<OffscreenCanvas>> {
let offscreencanvas = OffscreenCanvas::new(global, height, width, None);
Ok(offscreencanvas)
}
pub fn get_size(&self) -> Size2D<u64> {
Size2D::new(self.Width(), self.Height())
}
pub fn context(&self) -> Option<Ref<OffscreenCanvasContext>> {
ref_filter_map::ref_filter_map(self.context.borrow(), |ctx| ctx.as_ref())
}
#[allow(unsafe_code)]
fn get_or_init_2d_context(&self) -> Option<DomRoot<OffscreenCanvasRenderingContext2D>> {
if let Some(ctx) = self.context() {
return match *ctx {
OffscreenCanvasContext::OffscreenContext2d(ref ctx) => Some(DomRoot::from_ref(ctx)),
};
}
let size = self.get_size();
let context = OffscreenCanvasRenderingContext2D::new(
&self.global(),
self,
size,
self.placeholder.as_ref().map(|c| &**c),
);
*self.context.borrow_mut() = Some(OffscreenCanvasContext::OffscreenContext2d(
Dom::from_ref(&*context),
));
Some(context)
}
}
impl OffscreenCanvasMethods for OffscreenCanvas {
// https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-getcontext
#[allow(unsafe_code)]
unsafe fn GetContext(
&self,
_cx: *mut JSContext,
id: DOMString,
_options: HandleValue,
) -> Option<OffscreenRenderingContext> {
match &*id {
"2d" => self
.get_or_init_2d_context()
.map(OffscreenRenderingContext::OffscreenCanvasRenderingContext2D),
/*"webgl" | "experimental-webgl" => self
.get_or_init_webgl_context(cx, options)
.map(OffscreenRenderingContext::WebGLRenderingContext),
"webgl2" | "experimental-webgl2" => self
.get_or_init_webgl2_context(cx, options)
.map(OffscreenRenderingContext::WebGL2RenderingContext),*/
_ => None,
}
}
// https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-width
fn Width(&self) -> u64 {
return self.width.get();
}
// https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-width
fn SetWidth(&self, value: u64) {
self.width.set(value);
}
// https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-height
fn Height(&self) -> u64 {
return self.height.get();
}
// https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-height
fn SetHeight(&self, value: u64) {
self.height.set(value);
}
}
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