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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 std::collections::HashMap;
use std::vec::Vec;
use base::id::{ImageBitmapId, ImageBitmapIndex};
use constellation_traits::SerializableImageBitmap;
use dom_struct::dom_struct;
use crate::dom::bindings::cell::DomRefCell;
use crate::dom::bindings::codegen::Bindings::ImageBitmapBinding::ImageBitmapMethods;
use crate::dom::bindings::reflector::{Reflector, reflect_dom_object};
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::serializable::Serializable;
use crate::dom::bindings::structuredclone::StructuredData;
use crate::dom::bindings::transferable::Transferable;
use crate::dom::globalscope::GlobalScope;
use crate::script_runtime::CanGc;
#[dom_struct]
pub(crate) struct ImageBitmap {
reflector_: Reflector,
width: u32,
height: u32,
/// The actual pixel data of the bitmap
///
/// If this is `None`, then the bitmap data has been released by calling
/// [`close`](https://html.spec.whatwg.org/multipage/#dom-imagebitmap-close)
bitmap_data: DomRefCell<Option<Vec<u8>>>,
origin_clean: Cell<bool>,
}
impl ImageBitmap {
fn new_inherited(width: u32, height: u32) -> ImageBitmap {
ImageBitmap {
reflector_: Reflector::new(),
width,
height,
bitmap_data: DomRefCell::new(Some(vec![])),
origin_clean: Cell::new(true),
}
}
pub(crate) fn new(
global: &GlobalScope,
width: u32,
height: u32,
can_gc: CanGc,
) -> DomRoot<ImageBitmap> {
//assigning to a variable the return object of new_inherited
let imagebitmap = Box::new(ImageBitmap::new_inherited(width, height));
reflect_dom_object(imagebitmap, global, can_gc)
}
pub(crate) fn set_bitmap_data(&self, data: Vec<u8>) {
*self.bitmap_data.borrow_mut() = Some(data);
}
pub(crate) fn origin_is_clean(&self) -> bool {
self.origin_clean.get()
}
pub(crate) fn set_origin_clean(&self, origin_is_clean: bool) {
self.origin_clean.set(origin_is_clean);
}
/// Return the value of the [`[[Detached]]`](https://html.spec.whatwg.org/multipage/#detached)
/// internal slot
fn is_detached(&self) -> bool {
self.bitmap_data.borrow().is_none()
}
}
impl Serializable for ImageBitmap {
type Index = ImageBitmapIndex;
type Data = SerializableImageBitmap;
/// <https://html.spec.whatwg.org/multipage/#the-imagebitmap-interface:serialization-steps>
fn serialize(&self) -> Result<(ImageBitmapId, Self::Data), ()> {
// Step 1. If value's origin-clean flag is not set, then throw a "DataCloneError" DOMException.
if !self.origin_is_clean() {
return Err(());
}
// If value has a [[Detached]] internal slot whose value is true,
// then throw a "DataCloneError" DOMException.
if self.is_detached() {
return Err(());
}
// Step 2. Set serialized.[[BitmapData]] to a copy of value's bitmap data.
let serialized = SerializableImageBitmap {
width: self.width,
height: self.height,
bitmap_data: self.bitmap_data.borrow().clone().unwrap(),
};
Ok((ImageBitmapId::new(), serialized))
}
/// <https://html.spec.whatwg.org/multipage/#the-imagebitmap-interface:deserialization-steps>
fn deserialize(
owner: &GlobalScope,
serialized: Self::Data,
can_gc: CanGc,
) -> Result<DomRoot<Self>, ()> {
let image_bitmap = ImageBitmap::new(owner, serialized.width, serialized.height, can_gc);
// Step 1. Set value's bitmap data to serialized.[[BitmapData]].
image_bitmap.set_bitmap_data(serialized.bitmap_data);
Ok(image_bitmap)
}
fn serialized_storage<'a>(
reader: StructuredData<'a, '_>,
) -> &'a mut Option<HashMap<ImageBitmapId, Self::Data>> {
match reader {
StructuredData::Reader(r) => &mut r.image_bitmaps,
StructuredData::Writer(w) => &mut w.image_bitmaps,
}
}
}
impl Transferable for ImageBitmap {
type Index = ImageBitmapIndex;
type Data = SerializableImageBitmap;
fn can_transfer(&self) -> bool {
if !self.origin_is_clean() || self.is_detached() {
return false;
}
true
}
/// <https://html.spec.whatwg.org/multipage/#the-imagebitmap-interface:transfer-steps>
fn transfer(&self) -> Result<(ImageBitmapId, SerializableImageBitmap), ()> {
// Step 1. If value's origin-clean flag is not set, then throw a "DataCloneError" DOMException.
if !self.origin_is_clean() {
return Err(());
}
// If value has a [[Detached]] internal slot whose value is true,
// then throw a "DataCloneError" DOMException.
if self.is_detached() {
return Err(());
}
// Step 2. Set dataHolder.[[BitmapData]] to value's bitmap data.
// Step 3. Unset value's bitmap data.
let serialized = SerializableImageBitmap {
width: self.width,
height: self.height,
bitmap_data: self.bitmap_data.borrow_mut().take().unwrap(),
};
Ok((ImageBitmapId::new(), serialized))
}
/// <https://html.spec.whatwg.org/multipage/#the-imagebitmap-interface:transfer-receiving-steps>
fn transfer_receive(
owner: &GlobalScope,
_: ImageBitmapId,
serialized: SerializableImageBitmap,
) -> Result<DomRoot<Self>, ()> {
let image_bitmap =
ImageBitmap::new(owner, serialized.width, serialized.height, CanGc::note());
// Step 1. Set value's bitmap data to serialized.[[BitmapData]].
image_bitmap.set_bitmap_data(serialized.bitmap_data);
Ok(image_bitmap)
}
fn serialized_storage<'a>(
data: StructuredData<'a, '_>,
) -> &'a mut Option<HashMap<ImageBitmapId, Self::Data>> {
match data {
StructuredData::Reader(r) => &mut r.transferred_image_bitmaps,
StructuredData::Writer(w) => &mut w.transferred_image_bitmaps,
}
}
}
impl ImageBitmapMethods<crate::DomTypeHolder> for ImageBitmap {
/// <https://html.spec.whatwg.org/multipage/#dom-imagebitmap-height>
fn Height(&self) -> u32 {
// Step 1. If this's [[Detached]] internal slot's value is true, then return 0.
if self.is_detached() {
return 0;
}
// Step 2. Return this's height, in CSS pixels.
self.height
}
/// <https://html.spec.whatwg.org/multipage/#dom-imagebitmap-width>
fn Width(&self) -> u32 {
// Step 1. If this's [[Detached]] internal slot's value is true, then return 0.
if self.is_detached() {
return 0;
}
// Step 2. Return this's width, in CSS pixels.
self.width
}
/// <https://html.spec.whatwg.org/multipage/#dom-imagebitmap-close>
fn Close(&self) {
// Step 1. Set this's [[Detached]] internal slot value to true.
// Step 2. Unset this's bitmap data.
// NOTE: The existence of the bitmap data is the internal slot in our implementation
self.bitmap_data.borrow_mut().take();
}
}
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