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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 dom::bindings::codegen::Bindings::ImageDataBinding;
use dom::bindings::codegen::Bindings::ImageDataBinding::ImageDataMethods;
use dom::bindings::error::{Fallible, Error};
use dom::bindings::reflector::{Reflector, reflect_dom_object};
use dom::bindings::root::DomRoot;
use dom::globalscope::GlobalScope;
use dom_struct::dom_struct;
use euclid::Size2D;
use js::jsapi::{Heap, JSContext, JSObject};
use js::rust::Runtime;
use js::typedarray::{Uint8ClampedArray, CreateWith};
use std::default::Default;
use std::ptr;
use std::ptr::NonNull;
use std::vec::Vec;
#[dom_struct]
pub struct ImageData {
reflector_: Reflector,
width: u32,
height: u32,
data: Heap<*mut JSObject>,
}
impl ImageData {
#[allow(unsafe_code)]
pub fn new(global: &GlobalScope,
width: u32,
height: u32,
mut data: Option<Vec<u8>>)
-> Fallible<DomRoot<ImageData>> {
let len = width * height * 4;
unsafe {
let cx = global.get_cx();
rooted!(in (cx) let mut js_object = ptr::null_mut::<JSObject>());
let data = match data {
Some(ref mut d) => {
d.resize(len as usize, 0);
CreateWith::Slice(&d[..])
},
None => CreateWith::Length(len),
};
Uint8ClampedArray::create(cx, data, js_object.handle_mut()).unwrap();
Self::new_with_jsobject(global, width, Some(height), Some(js_object.get()))
}
}
#[allow(unsafe_code)]
unsafe fn new_with_jsobject(global: &GlobalScope,
width: u32,
mut opt_height: Option<u32>,
opt_jsobject: Option<*mut JSObject>)
-> Fallible<DomRoot<ImageData>> {
assert!(opt_jsobject.is_some() || opt_height.is_some());
if width == 0 {
return Err(Error::IndexSize);
}
// checking jsobject type and verifying (height * width * 4 == jsobject.byte_len())
if let Some(jsobject) = opt_jsobject {
let cx = global.get_cx();
typedarray!(in(cx) let array_res: Uint8ClampedArray = jsobject);
let mut array = array_res
.map_err(|_| Error::Type("Argument to Image data is not an Uint8ClampedArray".to_owned()))?;
let byte_len = array.as_slice().len() as u32;
if byte_len % 4 != 0 {
return Err(Error::InvalidState);
}
let len = byte_len / 4;
if width == 0 || len % width != 0 {
return Err(Error::IndexSize);
}
let height = len / width;
if opt_height.map_or(false, |x| height != x) {
return Err(Error::IndexSize);
} else {
opt_height = Some(height);
}
}
let height = opt_height.unwrap();
if height == 0 {
return Err(Error::IndexSize);
}
let imagedata = Box::new(ImageData {
reflector_: Reflector::new(),
width: width,
height: height,
data: Heap::default(),
});
if let Some(jsobject) = opt_jsobject {
(*imagedata).data.set(jsobject);
} else {
let len = width * height * 4;
let cx = global.get_cx();
rooted!(in (cx) let mut array = ptr::null_mut::<JSObject>());
Uint8ClampedArray::create(cx, CreateWith::Length(len), array.handle_mut()).unwrap();
(*imagedata).data.set(array.get());
}
Ok(reflect_dom_object(imagedata, global, ImageDataBinding::Wrap))
}
// https://html.spec.whatwg.org/multipage/#pixel-manipulation:dom-imagedata-3
#[allow(unsafe_code)]
pub fn Constructor(global: &GlobalScope, width: u32, height: u32) -> Fallible<DomRoot<Self>> {
unsafe { Self::new_with_jsobject(global, width, Some(height), None) }
}
// https://html.spec.whatwg.org/multipage/#pixel-manipulation:dom-imagedata-4
#[allow(unsafe_code)]
#[allow(unused_variables)]
pub unsafe fn Constructor_(cx: *mut JSContext,
global: &GlobalScope,
jsobject: *mut JSObject,
width: u32,
opt_height: Option<u32>)
-> Fallible<DomRoot<Self>> {
Self::new_with_jsobject(global, width, opt_height, Some(jsobject))
}
#[allow(unsafe_code)]
pub fn get_data_array(&self) -> Vec<u8> {
unsafe {
assert!(!self.data.get().is_null());
let cx = Runtime::get();
assert!(!cx.is_null());
typedarray!(in(cx) let array: Uint8ClampedArray = self.data.get());
let vec = array.unwrap().as_slice().to_vec();
vec
}
}
pub fn get_size(&self) -> Size2D<i32> {
Size2D::new(self.Width() as i32, self.Height() as i32)
}
}
impl ImageDataMethods for ImageData {
// https://html.spec.whatwg.org/multipage/#dom-imagedata-width
fn Width(&self) -> u32 {
self.width
}
// https://html.spec.whatwg.org/multipage/#dom-imagedata-height
fn Height(&self) -> u32 {
self.height
}
#[allow(unsafe_code)]
// https://html.spec.whatwg.org/multipage/#dom-imagedata-data
unsafe fn Data(&self, _: *mut JSContext) -> NonNull<JSObject> {
NonNull::new(self.data.get()).expect("got a null pointer")
}
}
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