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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 std::cell::Cell;
use dom_struct::dom_struct;
use euclid::default::Size2D;
use js::rust::{HandleObject, HandleValue};
use snapshot::Snapshot;
use crate::canvas_context::{CanvasContext, OffscreenRenderingContext};
use crate::dom::bindings::cell::{DomRefCell, Ref};
use crate::dom::bindings::codegen::Bindings::OffscreenCanvasBinding::{
OffscreenCanvasMethods, OffscreenRenderingContext as RootedOffscreenRenderingContext,
};
use crate::dom::bindings::error::{Error, Fallible};
use crate::dom::bindings::reflector::{DomGlobal, reflect_dom_object_with_proto};
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 crate::script_runtime::{CanGc, JSContext};
/// <https://html.spec.whatwg.org/multipage/#offscreencanvas>
#[dom_struct]
pub(crate) struct OffscreenCanvas {
eventtarget: EventTarget,
width: Cell<u64>,
height: Cell<u64>,
/// Represents both the [bitmap] and the [context mode] of the canvas.
///
/// [bitmap]: https://html.spec.whatwg.org/multipage/#offscreencanvas-bitmap
/// [context mode]: https://html.spec.whatwg.org/multipage/#offscreencanvas-context-mode
context: DomRefCell<Option<OffscreenRenderingContext>>,
/// <https://html.spec.whatwg.org/multipage/#offscreencanvas-placeholder>
placeholder: Option<Dom<HTMLCanvasElement>>,
}
impl OffscreenCanvas {
pub(crate) fn new_inherited(
width: u64,
height: u64,
placeholder: Option<&HTMLCanvasElement>,
) -> OffscreenCanvas {
OffscreenCanvas {
eventtarget: EventTarget::new_inherited(),
width: Cell::new(width),
height: Cell::new(height),
context: DomRefCell::new(None),
placeholder: placeholder.map(Dom::from_ref),
}
}
pub(crate) fn new(
global: &GlobalScope,
proto: Option<HandleObject>,
width: u64,
height: u64,
placeholder: Option<&HTMLCanvasElement>,
can_gc: CanGc,
) -> DomRoot<OffscreenCanvas> {
reflect_dom_object_with_proto(
Box::new(OffscreenCanvas::new_inherited(width, height, placeholder)),
global,
proto,
can_gc,
)
}
pub(crate) fn get_size(&self) -> Size2D<u64> {
Size2D::new(self.Width(), self.Height())
}
pub(crate) fn origin_is_clean(&self) -> bool {
match *self.context.borrow() {
Some(ref context) => context.origin_is_clean(),
_ => true,
}
}
pub(crate) fn context(&self) -> Option<Ref<OffscreenRenderingContext>> {
Ref::filter_map(self.context.borrow(), |ctx| ctx.as_ref()).ok()
}
pub(crate) fn get_image_data(&self) -> Option<Snapshot> {
match self.context.borrow().as_ref() {
Some(context) => context.get_image_data(),
None => {
let size = self.get_size();
if size.width == 0 || size.height == 0 {
None
} else {
Some(Snapshot::cleared(size))
}
},
}
}
pub(crate) fn get_or_init_2d_context(
&self,
can_gc: CanGc,
) -> Option<DomRoot<OffscreenCanvasRenderingContext2D>> {
if let Some(ctx) = self.context() {
return match *ctx {
OffscreenRenderingContext::Context2d(ref ctx) => Some(DomRoot::from_ref(ctx)),
};
}
let context = OffscreenCanvasRenderingContext2D::new(&self.global(), self, can_gc);
*self.context.borrow_mut() = Some(OffscreenRenderingContext::Context2d(Dom::from_ref(
&*context,
)));
Some(context)
}
pub(crate) fn is_valid(&self) -> bool {
self.Width() != 0 && self.Height() != 0
}
pub(crate) fn placeholder(&self) -> Option<&HTMLCanvasElement> {
self.placeholder.as_deref()
}
}
impl OffscreenCanvasMethods<crate::DomTypeHolder> for OffscreenCanvas {
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas>
fn Constructor(
global: &GlobalScope,
proto: Option<HandleObject>,
can_gc: CanGc,
width: u64,
height: u64,
) -> Fallible<DomRoot<OffscreenCanvas>> {
let offscreencanvas = OffscreenCanvas::new(global, proto, width, height, None, can_gc);
Ok(offscreencanvas)
}
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-getcontext>
fn GetContext(
&self,
_cx: JSContext,
id: DOMString,
_options: HandleValue,
can_gc: CanGc,
) -> Fallible<Option<RootedOffscreenRenderingContext>> {
match &*id {
"2d" => Ok(self
.get_or_init_2d_context(can_gc)
.map(RootedOffscreenRenderingContext::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),*/
_ => Err(Error::Type(String::from(
"Unrecognized OffscreenCanvas context type",
))),
}
}
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-width>
fn Width(&self) -> u64 {
self.width.get()
}
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-width>
fn SetWidth(&self, value: u64, can_gc: CanGc) {
self.width.set(value);
if let Some(canvas_context) = self.context() {
canvas_context.resize();
}
if let Some(canvas) = &self.placeholder {
canvas.set_natural_width(value as _, can_gc);
}
}
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-height>
fn Height(&self) -> u64 {
self.height.get()
}
/// <https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-height>
fn SetHeight(&self, value: u64, can_gc: CanGc) {
self.height.set(value);
if let Some(canvas_context) = self.context() {
canvas_context.resize();
}
if let Some(canvas) = &self.placeholder {
canvas.set_natural_height(value as _, can_gc);
}
}
}
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