1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/* 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::global::GlobalRef;
use dom::bindings::js::Root;
use dom::bindings::reflector::{Reflector, reflect_dom_object};
use euclid::size::Size2D;
use js::jsapi::{Heap, JSContext, JSObject};
use js::jsapi::{JS_GetUint8ClampedArrayData, JS_NewUint8ClampedArray};
use libc::uint8_t;
use std::default::Default;
use std::ptr;
use std::slice;
use std::vec::Vec;
#[dom_struct]
#[allow(raw_pointer_derive)]
pub struct ImageData {
reflector_: Reflector,
width: u32,
height: u32,
data: Heap<*mut JSObject>,
}
impl ImageData {
#[allow(unsafe_code)]
pub fn new(global: GlobalRef, width: u32, height: u32, data: Option<Vec<u8>>) -> Root<ImageData> {
let mut imagedata = box ImageData {
reflector_: Reflector::new(),
width: width,
height: height,
data: Heap::default(),
};
unsafe {
let cx = global.get_cx();
let js_object: *mut JSObject = JS_NewUint8ClampedArray(cx, width * height * 4);
if let Some(vec) = data {
let js_object_data: *mut uint8_t = JS_GetUint8ClampedArrayData(js_object, ptr::null());
ptr::copy_nonoverlapping(vec.as_ptr(), js_object_data, vec.len())
}
(*imagedata).data.set(js_object);
}
reflect_dom_object(imagedata,
global, ImageDataBinding::Wrap)
}
#[allow(unsafe_code)]
pub fn get_data_array(&self, global: &GlobalRef) -> Vec<u8> {
unsafe {
let cx = global.get_cx();
let data: *const uint8_t = JS_GetUint8ClampedArrayData(self.Data(cx), ptr::null()) as *const uint8_t;
let len = self.Width() * self.Height() * 4;
slice::from_raw_parts(data, len as usize).to_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
}
// https://html.spec.whatwg.org/multipage/#dom-imagedata-data
fn Data(&self, _: *mut JSContext) -> *mut JSObject {
self.data.get()
}
}
|
