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servo/components/script/dom/canvasrenderingcontext2d.rs
rohan.prinja 6e774ea6eb merge from master
2015-11-03 19:01:23 +09:00

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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 canvas::canvas_paint_task::RectToi32;
use canvas_traits::{Canvas2dMsg, CanvasCommonMsg, CanvasMsg};
use canvas_traits::{CompositionOrBlending, LineCapStyle, LineJoinStyle};
use canvas_traits::{FillOrStrokeStyle, LinearGradientStyle, RadialGradientStyle, RepetitionStyle};
use cssparser::Color as CSSColor;
use cssparser::{Parser, RGBA};
use dom::bindings::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding;
use dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding::CanvasRenderingContext2DMethods;
use dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding::CanvasWindingRule;
use dom::bindings::codegen::Bindings::ImageDataBinding::ImageDataMethods;
use dom::bindings::codegen::UnionTypes::HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D;
use dom::bindings::codegen::UnionTypes::StringOrCanvasGradientOrCanvasPattern;
use dom::bindings::error::{Error, Fallible};
use dom::bindings::global::{GlobalField, GlobalRef};
use dom::bindings::inheritance::Castable;
use dom::bindings::js::{JS, LayoutJS, Root};
use dom::bindings::num::Finite;
use dom::bindings::reflector::{Reflector, reflect_dom_object};
use dom::canvasgradient::{CanvasGradient, CanvasGradientStyle, ToFillOrStrokeStyle};
use dom::canvaspattern::CanvasPattern;
use dom::htmlcanvaselement::HTMLCanvasElement;
use dom::htmlcanvaselement::utils as canvas_utils;
use dom::htmlimageelement::HTMLImageElement;
use dom::imagedata::ImageData;
use dom::node::{Node, NodeDamage, window_from_node};
use euclid::matrix2d::Matrix2D;
use euclid::point::Point2D;
use euclid::rect::Rect;
use euclid::size::Size2D;
use ipc_channel::ipc::{self, IpcSender};
use msg::constellation_msg::Msg as ConstellationMsg;
use net_traits::image::base::PixelFormat;
use net_traits::image_cache_task::ImageResponse;
use num::{Float, ToPrimitive};
use std::borrow::ToOwned;
use std::str::FromStr;
use std::sync::mpsc::channel;
use std::{cmp, fmt};
use unpremultiplytable::UNPREMULTIPLY_TABLE;
use url::Url;
use util::str::DOMString;
use util::vec::byte_swap;
#[must_root]
#[derive(JSTraceable, Clone, HeapSizeOf)]
enum CanvasFillOrStrokeStyle {
Color(RGBA),
Gradient(JS<CanvasGradient>),
// Pattern(JS<CanvasPattern>), // https://github.com/servo/servo/pull/6157
}
// https://html.spec.whatwg.org/multipage/#canvasrenderingcontext2d
#[dom_struct]
pub struct CanvasRenderingContext2D {
reflector_: Reflector,
global: GlobalField,
renderer_id: usize,
#[ignore_heap_size_of = "Defined in ipc-channel"]
ipc_renderer: IpcSender<CanvasMsg>,
canvas: JS<HTMLCanvasElement>,
state: DOMRefCell<CanvasContextState>,
saved_states: DOMRefCell<Vec<CanvasContextState>>,
}
#[must_root]
#[derive(JSTraceable, Clone, HeapSizeOf)]
struct CanvasContextState {
global_alpha: f64,
global_composition: CompositionOrBlending,
image_smoothing_enabled: bool,
fill_style: CanvasFillOrStrokeStyle,
stroke_style: CanvasFillOrStrokeStyle,
line_width: f64,
line_cap: LineCapStyle,
line_join: LineJoinStyle,
miter_limit: f64,
transform: Matrix2D<f32>,
shadow_offset_x: f64,
shadow_offset_y: f64,
shadow_blur: f64,
shadow_color: RGBA,
}
impl CanvasContextState {
fn new() -> CanvasContextState {
let black = RGBA {
red: 0.0,
green: 0.0,
blue: 0.0,
alpha: 1.0,
};
CanvasContextState {
global_alpha: 1.0,
global_composition: CompositionOrBlending::default(),
image_smoothing_enabled: true,
fill_style: CanvasFillOrStrokeStyle::Color(black),
stroke_style: CanvasFillOrStrokeStyle::Color(black),
line_width: 1.0,
line_cap: LineCapStyle::Butt,
line_join: LineJoinStyle::Miter,
miter_limit: 10.0,
transform: Matrix2D::identity(),
shadow_offset_x: 0.0,
shadow_offset_y: 0.0,
shadow_blur: 0.0,
shadow_color: RGBA { red: 0.0, green: 0.0, blue: 0.0, alpha: 0.0 }, // transparent black
}
}
}
impl CanvasRenderingContext2D {
fn new_inherited(global: GlobalRef, canvas: &HTMLCanvasElement, size: Size2D<i32>)
-> CanvasRenderingContext2D {
let (sender, receiver) = ipc::channel().unwrap();
let constellation_chan = global.constellation_chan();
constellation_chan.0.send(ConstellationMsg::CreateCanvasPaintTask(size, sender)).unwrap();
let (ipc_renderer, renderer_id) = receiver.recv().unwrap();
CanvasRenderingContext2D {
reflector_: Reflector::new(),
global: GlobalField::from_rooted(&global),
renderer_id: renderer_id,
ipc_renderer: ipc_renderer,
canvas: JS::from_ref(canvas),
state: DOMRefCell::new(CanvasContextState::new()),
saved_states: DOMRefCell::new(Vec::new()),
}
}
pub fn new(global: GlobalRef, canvas: &HTMLCanvasElement, size: Size2D<i32>)
-> Root<CanvasRenderingContext2D> {
reflect_dom_object(box CanvasRenderingContext2D::new_inherited(global, canvas, size),
global, CanvasRenderingContext2DBinding::Wrap)
}
pub fn recreate(&self, size: Size2D<i32>) {
self.ipc_renderer
.send(CanvasMsg::Common(CanvasCommonMsg::Recreate(size)))
.unwrap();
}
pub fn ipc_renderer(&self) -> IpcSender<CanvasMsg> {
self.ipc_renderer.clone()
}
fn mark_as_dirty(&self) {
self.canvas.upcast::<Node>().dirty(NodeDamage::OtherNodeDamage);
}
fn update_transform(&self) {
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetTransform(self.state.borrow().transform)))
.unwrap()
}
// It is used by DrawImage to calculate the size of the source and destination rectangles based
// on the drawImage call arguments
// source rectangle = area of the original image to be copied
// destination rectangle = area of the destination canvas where the source image is going to be drawn
fn adjust_source_dest_rects(&self,
image_size: Size2D<f64>,
sx: f64, sy: f64, sw: f64, sh: f64,
dx: f64, dy: f64, dw: f64, dh: f64) -> (Rect<f64>, Rect<f64>) {
let image_rect = Rect::new(Point2D::new(0f64, 0f64),
Size2D::new(image_size.width as f64, image_size.height as f64));
// The source rectangle is the rectangle whose corners are the four points (sx, sy),
// (sx+sw, sy), (sx+sw, sy+sh), (sx, sy+sh).
let source_rect = Rect::new(Point2D::new(sx.min(sx + sw), sy.min(sy + sh)),
Size2D::new(sw.abs(), sh.abs()));
// When the source rectangle is outside the source image,
// the source rectangle must be clipped to the source image
let source_rect_clipped = source_rect.intersection(&image_rect).unwrap_or(Rect::zero());
// Width and height ratios between the non clipped and clipped source rectangles
let width_ratio: f64 = source_rect_clipped.size.width / source_rect.size.width;
let height_ratio: f64 = source_rect_clipped.size.height / source_rect.size.height;
// When the source rectangle is outside the source image,
// the destination rectangle must be clipped in the same proportion.
let dest_rect_width_scaled: f64 = dw * width_ratio;
let dest_rect_height_scaled: f64 = dh * height_ratio;
// The destination rectangle is the rectangle whose corners are the four points (dx, dy),
// (dx+dw, dy), (dx+dw, dy+dh), (dx, dy+dh).
let dest_rect = Rect::new(Point2D::new(dx.min(dx + dest_rect_width_scaled),
dy.min(dy + dest_rect_height_scaled)),
Size2D::new(dest_rect_width_scaled.abs(),
dest_rect_height_scaled.abs()));
let source_rect = Rect::new(Point2D::new(source_rect_clipped.origin.x,
source_rect_clipped.origin.y),
Size2D::new(source_rect_clipped.size.width,
source_rect_clipped.size.height));
(source_rect, dest_rect)
}
//
// drawImage coordinates explained
//
// Source Image Destination Canvas
// +-------------+ +-------------+
// | | | |
// |(sx,sy) | |(dx,dy) |
// | +----+ | | +----+ |
// | | | | | | | |
// | | |sh |---->| | |dh |
// | | | | | | | |
// | +----+ | | +----+ |
// | sw | | dw |
// | | | |
// +-------------+ +-------------+
//
//
// The rectangle (sx, sy, sw, sh) from the source image
// is copied on the rectangle (dx, dy, dh, dw) of the destination canvas
//
// https://html.spec.whatwg.org/multipage/#dom-context-2d-drawimage
fn draw_image(&self, image: HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D,
sx: f64, sy: f64, sw: Option<f64>, sh: Option<f64>,
dx: f64, dy: f64, dw: Option<f64>, dh: Option<f64>) -> Fallible<()> {
match image {
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eHTMLCanvasElement(canvas) =>
self.draw_html_canvas_element(canvas.r(),
sx, sy, sw, sh,
dx, dy, dw, dh),
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eCanvasRenderingContext2D(image) => {
let context = image.r();
let canvas = context.Canvas();
self.draw_html_canvas_element(canvas.r(),
sx, sy, sw, sh,
dx, dy, dw, dh)
}
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eHTMLImageElement(image) => {
let image_element = image.r();
// https://html.spec.whatwg.org/multipage/#img-error
// If the image argument is an HTMLImageElement object that is in the broken state,
// then throw an InvalidStateError exception
let (image_data, image_size) = match self.fetch_image_data(&image_element) {
Some((mut data, size)) => {
// Pixels come from cache in BGRA order and drawImage expects RGBA so we
// have to swap the color values
byte_swap(&mut data);
let size = Size2D::new(size.width as f64, size.height as f64);
(data, size)
},
None => return Err(Error::InvalidState),
};
let dw = dw.unwrap_or(image_size.width);
let dh = dh.unwrap_or(image_size.height);
let sw = sw.unwrap_or(image_size.width);
let sh = sh.unwrap_or(image_size.height);
self.draw_image_data(image_data,
image_size,
sx, sy, sw, sh,
dx, dy, dw, dh)
}
}
}
fn draw_html_canvas_element(&self,
canvas: &HTMLCanvasElement,
sx: f64, sy: f64, sw: Option<f64>, sh: Option<f64>,
dx: f64, dy: f64, dw: Option<f64>, dh: Option<f64>) -> Fallible<()> {
// 1. Check the usability of the image argument
if !canvas.is_valid() {
return Err(Error::InvalidState)
}
let canvas_size = canvas.get_size();
let dw = dw.unwrap_or(canvas_size.width as f64);
let dh = dh.unwrap_or(canvas_size.height as f64);
let sw = sw.unwrap_or(canvas_size.width as f64);
let sh = sh.unwrap_or(canvas_size.height as f64);
let image_size = Size2D::new(canvas_size.width as f64, canvas_size.height as f64);
// 2. Establish the source and destination rectangles
let (source_rect, dest_rect) = self.adjust_source_dest_rects(image_size, sx, sy, sw, sh, dx, dy, dw, dh);
if !is_rect_valid(source_rect) || !is_rect_valid(dest_rect) {
return Err(Error::IndexSize)
}
let smoothing_enabled = self.state.borrow().image_smoothing_enabled;
// If the source and target canvas are the same
let msg = if &*self.canvas == canvas {
CanvasMsg::Canvas2d(Canvas2dMsg::DrawImageSelf(image_size, dest_rect, source_rect, smoothing_enabled))
} else { // Source and target canvases are different
let context = match canvas.get_or_init_2d_context() {
Some(context) => context,
None => return Err(Error::InvalidState),
};
let renderer = context.r().get_ipc_renderer();
let (sender, receiver) = ipc::channel::<Vec<u8>>().unwrap();
// Reads pixels from source image
renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::GetImageData(source_rect.to_i32(),
image_size,
sender))).unwrap();
let imagedata = receiver.recv().unwrap();
// Writes pixels to destination canvas
CanvasMsg::Canvas2d(
Canvas2dMsg::DrawImage(imagedata, source_rect.size, dest_rect, source_rect, smoothing_enabled))
};
self.ipc_renderer.send(msg).unwrap();
self.mark_as_dirty();
Ok(())
}
fn draw_image_data(&self,
image_data: Vec<u8>,
image_size: Size2D<f64>,
sx: f64, sy: f64, sw: f64, sh: f64,
dx: f64, dy: f64, dw: f64, dh: f64) -> Fallible<()> {
// Establish the source and destination rectangles
let (source_rect, dest_rect) = self.adjust_source_dest_rects(image_size, sx, sy, sw, sh, dx, dy, dw, dh);
if !is_rect_valid(source_rect) || !is_rect_valid(dest_rect) {
return Err(Error::IndexSize)
}
let smoothing_enabled = self.state.borrow().image_smoothing_enabled;
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::DrawImage(image_data,
image_size,
dest_rect,
source_rect,
smoothing_enabled)))
.unwrap();
self.mark_as_dirty();
Ok(())
}
fn fetch_image_data(&self,
image_element: &HTMLImageElement)
-> Option<(Vec<u8>, Size2D<i32>)> {
let url = match image_element.get_url() {
Some(url) => url,
None => return None,
};
let img = match self.request_image_from_cache(url) {
ImageResponse::Loaded(img) => img,
ImageResponse::PlaceholderLoaded(_) | ImageResponse::None => {
return None
}
};
let image_size = Size2D::new(img.width as i32, img.height as i32);
let image_data = match img.format {
PixelFormat::RGBA8 => img.bytes.to_vec(),
PixelFormat::K8 => panic!("K8 color type not supported"),
PixelFormat::RGB8 => panic!("RGB8 color type not supported"),
PixelFormat::KA8 => panic!("KA8 color type not supported"),
};
Some((image_data, image_size))
}
#[inline]
fn request_image_from_cache(&self, url: Url) -> ImageResponse {
let window = window_from_node(&*self.canvas);
canvas_utils::request_image_from_cache(window.r(), url)
}
fn create_drawable_rect(&self, x: f64, y: f64, w: f64, h: f64) -> Option<Rect<f32>> {
if !([x, y, w, h].iter().all(|val| val.is_finite())) {
return None;
}
if w == 0.0 && h == 0.0 {
return None;
}
Some(Rect::new(Point2D::new(x as f32, y as f32), Size2D::new(w as f32, h as f32)))
}
pub fn get_renderer_id(&self) -> usize {
self.renderer_id
}
pub fn get_ipc_renderer(&self) -> IpcSender<CanvasMsg> {
self.ipc_renderer.clone()
}
}
pub trait LayoutCanvasRenderingContext2DHelpers {
#[allow(unsafe_code)]
unsafe fn get_renderer_id(&self) -> usize;
#[allow(unsafe_code)]
unsafe fn get_ipc_renderer(&self) -> IpcSender<CanvasMsg>;
}
impl LayoutCanvasRenderingContext2DHelpers for LayoutJS<CanvasRenderingContext2D> {
#[allow(unsafe_code)]
unsafe fn get_renderer_id(&self) -> usize {
(*self.unsafe_get()).renderer_id
}
#[allow(unsafe_code)]
unsafe fn get_ipc_renderer(&self) -> IpcSender<CanvasMsg> {
(*self.unsafe_get()).ipc_renderer.clone()
}
}
// We add a guard to each of methods by the spec:
// http://www.w3.org/html/wg/drafts/2dcontext/html5_canvas_CR/
//
// > Except where otherwise specified, for the 2D context interface,
// > any method call with a numeric argument whose value is infinite or a NaN value must be ignored.
//
// Restricted values are guarded in glue code. Therefore we need not add a guard.
//
// FIXME: this behavior should might be generated by some annotattions to idl.
impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
// https://html.spec.whatwg.org/multipage/#dom-context-2d-canvas
fn Canvas(&self) -> Root<HTMLCanvasElement> {
Root::from_ref(&*self.canvas)
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-save
fn Save(&self) {
self.saved_states.borrow_mut().push(self.state.borrow().clone());
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SaveContext)).unwrap();
}
#[allow(unrooted_must_root)]
// https://html.spec.whatwg.org/multipage/#dom-context-2d-restore
fn Restore(&self) {
let mut saved_states = self.saved_states.borrow_mut();
if let Some(state) = saved_states.pop() {
self.state.borrow_mut().clone_from(&state);
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::RestoreContext)).unwrap();
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-scale
fn Scale(&self, x: f64, y: f64) {
if !(x.is_finite() && y.is_finite()) {
return;
}
let transform = self.state.borrow().transform;
self.state.borrow_mut().transform = transform.scale(x as f32, y as f32);
self.update_transform()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-rotate
fn Rotate(&self, angle: f64) {
if angle == 0.0 || !angle.is_finite() {
return;
}
let (sin, cos) = (angle.sin(), angle.cos());
let transform = self.state.borrow().transform;
self.state.borrow_mut().transform = transform.mul(&Matrix2D::new(cos as f32, sin as f32,
-sin as f32, cos as f32,
0.0, 0.0));
self.update_transform()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-translate
fn Translate(&self, x: f64, y: f64) {
if !(x.is_finite() && y.is_finite()) {
return;
}
let transform = self.state.borrow().transform;
self.state.borrow_mut().transform = transform.translate(x as f32, y as f32);
self.update_transform()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-transform
fn Transform(&self, a: f64, b: f64, c: f64, d: f64, e: f64, f: f64) {
if !(a.is_finite() && b.is_finite() && c.is_finite() &&
d.is_finite() && e.is_finite() && f.is_finite()) {
return;
}
let transform = self.state.borrow().transform;
self.state.borrow_mut().transform = transform.mul(&Matrix2D::new(a as f32,
b as f32,
c as f32,
d as f32,
e as f32,
f as f32));
self.update_transform()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-settransform
fn SetTransform(&self, a: f64, b: f64, c: f64, d: f64, e: f64, f: f64) {
if !(a.is_finite() && b.is_finite() && c.is_finite() &&
d.is_finite() && e.is_finite() && f.is_finite()) {
return;
}
self.state.borrow_mut().transform = Matrix2D::new(a as f32,
b as f32,
c as f32,
d as f32,
e as f32,
f as f32);
self.update_transform()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-resettransform
fn ResetTransform(&self) {
self.state.borrow_mut().transform = Matrix2D::identity();
self.update_transform()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-globalalpha
fn GlobalAlpha(&self) -> f64 {
let state = self.state.borrow();
state.global_alpha
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-globalalpha
fn SetGlobalAlpha(&self, alpha: f64) {
if !alpha.is_finite() || alpha > 1.0 || alpha < 0.0 {
return;
}
self.state.borrow_mut().global_alpha = alpha;
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetGlobalAlpha(alpha as f32)))
.unwrap()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-globalcompositeoperation
fn GlobalCompositeOperation(&self) -> DOMString {
let state = self.state.borrow();
match state.global_composition {
CompositionOrBlending::Composition(op) => op.to_str().to_owned(),
CompositionOrBlending::Blending(op) => op.to_str().to_owned(),
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-globalcompositeoperation
fn SetGlobalCompositeOperation(&self, op_str: DOMString) {
if let Ok(op) = CompositionOrBlending::from_str(&op_str) {
self.state.borrow_mut().global_composition = op;
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetGlobalComposition(op)))
.unwrap()
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-fillrect
fn FillRect(&self, x: f64, y: f64, width: f64, height: f64) {
if let Some(rect) = self.create_drawable_rect(x, y, width, height) {
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::FillRect(rect))).unwrap();
self.mark_as_dirty();
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-clearrect
fn ClearRect(&self, x: f64, y: f64, width: f64, height: f64) {
if let Some(rect) = self.create_drawable_rect(x, y, width, height) {
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::ClearRect(rect)))
.unwrap();
self.mark_as_dirty();
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-strokerect
fn StrokeRect(&self, x: f64, y: f64, width: f64, height: f64) {
if let Some(rect) = self.create_drawable_rect(x, y, width, height) {
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::StrokeRect(rect)))
.unwrap();
self.mark_as_dirty();
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-beginpath
fn BeginPath(&self) {
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::BeginPath)).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-closepath
fn ClosePath(&self) {
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::ClosePath)).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-fill
fn Fill(&self, _: CanvasWindingRule) {
// TODO: Process winding rule
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::Fill)).unwrap();
self.mark_as_dirty();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-stroke
fn Stroke(&self) {
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::Stroke)).unwrap();
self.mark_as_dirty();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-clip
fn Clip(&self, _: CanvasWindingRule) {
// TODO: Process winding rule
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::Clip)).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-drawimage
fn DrawImage(&self, image: HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D,
dx: f64, dy: f64) -> Fallible<()> {
if !(dx.is_finite() && dy.is_finite()) {
return Ok(());
}
self.draw_image(image, 0f64, 0f64, None, None, dx, dy, None, None)
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-drawimage
fn DrawImage_(&self, image: HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D,
dx: f64, dy: f64, dw: f64, dh: f64) -> Fallible<()> {
if !(dx.is_finite() && dy.is_finite() &&
dw.is_finite() && dh.is_finite()) {
return Ok(());
}
self.draw_image(image, 0f64, 0f64, None, None, dx, dy, Some(dw), Some(dh))
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-drawimage
fn DrawImage__(&self, image: HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D,
sx: f64, sy: f64, sw: f64, sh: f64,
dx: f64, dy: f64, dw: f64, dh: f64) -> Fallible<()> {
if !(sx.is_finite() && sy.is_finite() && sw.is_finite() && sh.is_finite() &&
dx.is_finite() && dy.is_finite() && dw.is_finite() && dh.is_finite()) {
return Ok(());
}
self.draw_image(image, sx, sy, Some(sw), Some(sh), dx, dy, Some(dw), Some(dh))
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-moveto
fn MoveTo(&self, x: f64, y: f64) {
if !(x.is_finite() && y.is_finite()) {
return;
}
let msg = CanvasMsg::Canvas2d(
Canvas2dMsg::MoveTo(
Point2D::new(x as f32, y as f32)));
self.ipc_renderer.send(msg).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-lineto
fn LineTo(&self, x: f64, y: f64) {
if !(x.is_finite() && y.is_finite()) {
return;
}
let msg = CanvasMsg::Canvas2d(
Canvas2dMsg::LineTo(
Point2D::new(x as f32, y as f32)));
self.ipc_renderer.send(msg).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-rect
fn Rect(&self, x: f64, y: f64, width: f64, height: f64) {
if [x, y, width, height].iter().all(|val| val.is_finite()) {
let rect = Rect::new(Point2D::new(x as f32, y as f32),
Size2D::new(width as f32, height as f32));
let msg = CanvasMsg::Canvas2d(Canvas2dMsg::Rect(rect));
self.ipc_renderer.send(msg).unwrap();
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-quadraticcurveto
fn QuadraticCurveTo(&self, cpx: f64, cpy: f64, x: f64, y: f64) {
if !(cpx.is_finite() && cpy.is_finite() &&
x.is_finite() && y.is_finite()) {
return;
}
let msg = CanvasMsg::Canvas2d(
Canvas2dMsg::QuadraticCurveTo(
Point2D::new(cpx as f32, cpy as f32),
Point2D::new(x as f32, y as f32)));
self.ipc_renderer.send(msg).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-beziercurveto
fn BezierCurveTo(&self, cp1x: f64, cp1y: f64, cp2x: f64, cp2y: f64, x: f64, y: f64) {
if !(cp1x.is_finite() && cp1y.is_finite() && cp2x.is_finite() && cp2y.is_finite() &&
x.is_finite() && y.is_finite()) {
return;
}
let msg = CanvasMsg::Canvas2d(
Canvas2dMsg::BezierCurveTo(
Point2D::new(cp1x as f32, cp1y as f32),
Point2D::new(cp2x as f32, cp2y as f32),
Point2D::new(x as f32, y as f32)));
self.ipc_renderer.send(msg).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-arc
fn Arc(&self, x: f64, y: f64, r: f64,
start: f64, end: f64, ccw: bool) -> Fallible<()> {
if !([x, y, r, start, end].iter().all(|x| x.is_finite())) {
return Ok(());
}
if r < 0.0 {
return Err(Error::IndexSize);
}
let msg = CanvasMsg::Canvas2d(
Canvas2dMsg::Arc(
Point2D::new(x as f32, y as f32), r as f32,
start as f32, end as f32, ccw));
self.ipc_renderer.send(msg).unwrap();
Ok(())
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-arcto
fn ArcTo(&self, cp1x: f64, cp1y: f64, cp2x: f64, cp2y: f64, r: f64) -> Fallible<()> {
if !([cp1x, cp1y, cp2x, cp2y, r].iter().all(|x| x.is_finite())) {
return Ok(());
}
if r < 0.0 {
return Err(Error::IndexSize);
}
let msg = CanvasMsg::Canvas2d(
Canvas2dMsg::ArcTo(
Point2D::new(cp1x as f32, cp1y as f32),
Point2D::new(cp2x as f32, cp2y as f32),
r as f32));
self.ipc_renderer.send(msg).unwrap();
Ok(())
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-imagesmoothingenabled
fn ImageSmoothingEnabled(&self) -> bool {
let state = self.state.borrow();
state.image_smoothing_enabled
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-imagesmoothingenabled
fn SetImageSmoothingEnabled(&self, value: bool) -> () {
self.state.borrow_mut().image_smoothing_enabled = value;
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-strokestyle
fn StrokeStyle(&self) -> StringOrCanvasGradientOrCanvasPattern {
match self.state.borrow().stroke_style {
CanvasFillOrStrokeStyle::Color(ref rgba) => {
let mut result = String::new();
serialize(rgba, &mut result).unwrap();
StringOrCanvasGradientOrCanvasPattern::eString(result)
},
CanvasFillOrStrokeStyle::Gradient(ref gradient) => {
StringOrCanvasGradientOrCanvasPattern::eCanvasGradient(Root::from_ref(&*gradient))
},
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-strokestyle
fn SetStrokeStyle(&self, value: StringOrCanvasGradientOrCanvasPattern) {
match value {
StringOrCanvasGradientOrCanvasPattern::eString(string) => {
match parse_color(&string) {
Ok(rgba) => {
self.state.borrow_mut().stroke_style = CanvasFillOrStrokeStyle::Color(rgba);
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetStrokeStyle(
FillOrStrokeStyle::Color(rgba))))
.unwrap();
}
_ => {}
}
},
StringOrCanvasGradientOrCanvasPattern::eCanvasGradient(gradient) => {
self.state.borrow_mut().stroke_style = CanvasFillOrStrokeStyle::Gradient(
JS::from_ref(gradient.r()));
let msg = CanvasMsg::Canvas2d(
Canvas2dMsg::SetStrokeStyle(gradient.r().to_fill_or_stroke_style()));
self.ipc_renderer.send(msg).unwrap();
},
_ => {}
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-strokestyle
fn FillStyle(&self) -> StringOrCanvasGradientOrCanvasPattern {
match self.state.borrow().fill_style {
CanvasFillOrStrokeStyle::Color(ref rgba) => {
let mut result = String::new();
serialize(rgba, &mut result).unwrap();
StringOrCanvasGradientOrCanvasPattern::eString(result)
},
CanvasFillOrStrokeStyle::Gradient(ref gradient) => {
StringOrCanvasGradientOrCanvasPattern::eCanvasGradient(Root::from_ref(&*gradient))
},
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-strokestyle
fn SetFillStyle(&self, value: StringOrCanvasGradientOrCanvasPattern) {
match value {
StringOrCanvasGradientOrCanvasPattern::eString(string) => {
if let Ok(rgba) = parse_color(&string) {
self.state.borrow_mut().fill_style = CanvasFillOrStrokeStyle::Color(rgba);
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetFillStyle(
FillOrStrokeStyle::Color(rgba))))
.unwrap()
}
}
StringOrCanvasGradientOrCanvasPattern::eCanvasGradient(gradient) => {
self.state.borrow_mut().fill_style = CanvasFillOrStrokeStyle::Gradient(
JS::from_rooted(&gradient));
let msg = CanvasMsg::Canvas2d(
Canvas2dMsg::SetFillStyle(gradient.r().to_fill_or_stroke_style()));
self.ipc_renderer.send(msg).unwrap();
}
StringOrCanvasGradientOrCanvasPattern::eCanvasPattern(pattern) => {
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetFillStyle(
pattern.r().to_fill_or_stroke_style()))).unwrap();
}
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-createimagedata
fn CreateImageData(&self, sw: Finite<f64>, sh: Finite<f64>) -> Fallible<Root<ImageData>> {
if *sw == 0.0 || *sh == 0.0 {
return Err(Error::IndexSize)
}
let sw = cmp::max(1, sw.abs().to_u32().unwrap());
let sh = cmp::max(1, sh.abs().to_u32().unwrap());
Ok(ImageData::new(self.global.root().r(), sw, sh, None))
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-createimagedata
fn CreateImageData_(&self, imagedata: &ImageData) -> Fallible<Root<ImageData>> {
Ok(ImageData::new(self.global.root().r(), imagedata.Width(), imagedata.Height(), None))
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-getimagedata
fn GetImageData(&self,
sx: Finite<f64>,
sy: Finite<f64>,
sw: Finite<f64>,
sh: Finite<f64>) -> Fallible<Root<ImageData>> {
let mut sx = *sx;
let mut sy = *sy;
let mut sw = *sw;
let mut sh = *sh;
if sw == 0.0 || sh == 0.0 {
return Err(Error::IndexSize)
}
if sw < 0.0 {
sw = -sw;
sx -= sw;
}
if sh < 0.0 {
sh = -sh;
sy -= sh;
}
let sh = cmp::max(1, sh.to_u32().unwrap());
let sw = cmp::max(1, sw.to_u32().unwrap());
let (sender, receiver) = ipc::channel::<Vec<u8>>().unwrap();
let dest_rect = Rect::new(Point2D::new(sx.to_i32().unwrap(), sy.to_i32().unwrap()),
Size2D::new(sw as i32, sh as i32));
let canvas_size = self.canvas.get_size();
let canvas_size = Size2D::new(canvas_size.width as f64, canvas_size.height as f64);
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::GetImageData(dest_rect, canvas_size, sender)))
.unwrap();
let mut data = receiver.recv().unwrap();
// Un-premultiply alpha
for chunk in data.chunks_mut(4) {
let alpha = chunk[3] as usize;
chunk[0] = UNPREMULTIPLY_TABLE[256 * alpha + chunk[0] as usize];
chunk[1] = UNPREMULTIPLY_TABLE[256 * alpha + chunk[1] as usize];
chunk[2] = UNPREMULTIPLY_TABLE[256 * alpha + chunk[2] as usize];
}
Ok(ImageData::new(self.global.root().r(), sw, sh, Some(data)))
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-putimagedata
fn PutImageData(&self, imagedata: &ImageData, dx: Finite<f64>, dy: Finite<f64>) {
self.PutImageData_(imagedata, dx, dy, Finite::wrap(0f64), Finite::wrap(0f64),
Finite::wrap(imagedata.Width() as f64), Finite::wrap(imagedata.Height() as f64))
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-putimagedata
fn PutImageData_(&self, imagedata: &ImageData, dx: Finite<f64>, dy: Finite<f64>,
dirtyX: Finite<f64>, dirtyY: Finite<f64>, dirtyWidth: Finite<f64>, dirtyHeight: Finite<f64>) {
let data = imagedata.get_data_array(&self.global.root().r());
let offset = Point2D::new(*dx, *dy);
let image_data_size = Size2D::new(imagedata.Width() as f64,
imagedata.Height() as f64);
let dirty_rect = Rect::new(Point2D::new(*dirtyX, *dirtyY),
Size2D::new(*dirtyWidth, *dirtyHeight));
let msg = CanvasMsg::Canvas2d(Canvas2dMsg::PutImageData(data, offset, image_data_size, dirty_rect));
self.ipc_renderer.send(msg).unwrap();
self.mark_as_dirty();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-createlineargradient
fn CreateLinearGradient(&self, x0: Finite<f64>, y0: Finite<f64>,
x1: Finite<f64>, y1: Finite<f64>) -> Root<CanvasGradient> {
CanvasGradient::new(self.global.root().r(),
CanvasGradientStyle::Linear(LinearGradientStyle::new(*x0, *y0, *x1, *y1, Vec::new())))
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-createradialgradient
fn CreateRadialGradient(&self, x0: Finite<f64>, y0: Finite<f64>, r0: Finite<f64>,
x1: Finite<f64>, y1: Finite<f64>, r1: Finite<f64>)
-> Fallible<Root<CanvasGradient>> {
if *r0 < 0. || *r1 < 0. {
return Err(Error::IndexSize);
}
Ok(CanvasGradient::new(self.global.root().r(),
CanvasGradientStyle::Radial(
RadialGradientStyle::new(*x0, *y0, *r0, *x1, *y1, *r1, Vec::new()))))
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-createpattern
fn CreatePattern(&self, image: HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D,
repetition: DOMString) -> Fallible<Root<CanvasPattern>> {
let (image_data, image_size) = match image {
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eHTMLImageElement(image) => {
let image_element = image.r();
// https://html.spec.whatwg.org/multipage/#img-error
// If the image argument is an HTMLImageElement object that is in the broken state,
// then throw an InvalidStateError exception
match self.fetch_image_data(&image_element) {
Some((data, size)) => (data, size),
None => return Err(Error::InvalidState),
}
},
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eHTMLCanvasElement(canvas) => {
let canvas = canvas.r();
let _ = canvas.get_or_init_2d_context();
match canvas.fetch_all_data() {
Some((data, size)) => (data, size),
None => return Err(Error::InvalidState),
}
},
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eCanvasRenderingContext2D(context) => {
let canvas = context.r().Canvas();
let canvas = canvas.r();
let _ = canvas.get_or_init_2d_context();
match canvas.fetch_all_data() {
Some((data, size)) => (data, size),
None => return Err(Error::InvalidState),
}
},
};
if let Ok(rep) = RepetitionStyle::from_str(&repetition) {
return Ok(CanvasPattern::new(self.global.root().r(),
image_data,
image_size,
rep));
}
return Err(Error::Syntax);
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-linewidth
fn LineWidth(&self) -> f64 {
let state = self.state.borrow();
state.line_width
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-linewidth
fn SetLineWidth(&self, width: f64) {
if !width.is_finite() || width <= 0.0 {
return;
}
self.state.borrow_mut().line_width = width;
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetLineWidth(width as f32)))
.unwrap()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-linecap
fn LineCap(&self) -> DOMString {
let state = self.state.borrow();
match state.line_cap {
LineCapStyle::Butt => "butt".to_owned(),
LineCapStyle::Round => "round".to_owned(),
LineCapStyle::Square => "square".to_owned(),
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-linecap
fn SetLineCap(&self, cap_str: DOMString) {
if let Ok(cap) = LineCapStyle::from_str(&cap_str) {
self.state.borrow_mut().line_cap = cap;
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetLineCap(cap))).unwrap()
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-linejoin
fn LineJoin(&self) -> DOMString {
let state = self.state.borrow();
match state.line_join {
LineJoinStyle::Round => "round".to_owned(),
LineJoinStyle::Bevel => "bevel".to_owned(),
LineJoinStyle::Miter => "miter".to_owned(),
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-linejoin
fn SetLineJoin(&self, join_str: DOMString) {
if let Ok(join) = LineJoinStyle::from_str(&join_str) {
self.state.borrow_mut().line_join = join;
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetLineJoin(join))).unwrap()
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-miterlimit
fn MiterLimit(&self) -> f64 {
let state = self.state.borrow();
state.miter_limit
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-miterlimit
fn SetMiterLimit(&self, limit: f64) {
if !limit.is_finite() || limit <= 0.0 {
return;
}
self.state.borrow_mut().miter_limit = limit;
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetMiterLimit(limit as f32)))
.unwrap()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-shadowoffsetx
fn ShadowOffsetX(&self) -> f64 {
self.state.borrow().shadow_offset_x
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-shadowoffsetx
fn SetShadowOffsetX(&self, value: f64) {
if !value.is_finite() || value == self.state.borrow().shadow_offset_x {
return;
}
self.state.borrow_mut().shadow_offset_x = value;
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetShadowOffsetX(value))).unwrap()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-shadowoffsety
fn ShadowOffsetY(&self) -> f64 {
self.state.borrow().shadow_offset_y
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-shadowoffsety
fn SetShadowOffsetY(&self, value: f64) {
if !value.is_finite() || value == self.state.borrow().shadow_offset_y {
return;
}
self.state.borrow_mut().shadow_offset_y = value;
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetShadowOffsetY(value))).unwrap()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-shadowblur
fn ShadowBlur(&self) -> f64 {
self.state.borrow().shadow_blur
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-shadowblur
fn SetShadowBlur(&self, value: f64) {
if !value.is_finite() || value < 0f64 || value == self.state.borrow().shadow_blur {
return;
}
self.state.borrow_mut().shadow_blur = value;
self.ipc_renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetShadowBlur(value))).unwrap()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-shadowcolor
fn ShadowColor(&self) -> DOMString {
let mut result = String::new();
serialize(&self.state.borrow().shadow_color, &mut result).unwrap();
result
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-shadowcolor
fn SetShadowColor(&self, value: DOMString) {
if let Ok(color) = parse_color(&value) {
self.state.borrow_mut().shadow_color = color;
self.ipc_renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetShadowColor(color)))
.unwrap()
}
}
}
impl Drop for CanvasRenderingContext2D {
fn drop(&mut self) {
self.ipc_renderer.send(CanvasMsg::Common(CanvasCommonMsg::Close)).unwrap();
}
}
pub fn parse_color(string: &str) -> Result<RGBA, ()> {
let mut parser = Parser::new(&string);
match CSSColor::parse(&mut parser) {
Ok(CSSColor::RGBA(rgba)) => {
if parser.is_exhausted() { Ok(rgba) }
else { Err(()) }
},
_ => Err(()),
}
}
// Used by drawImage to determine if a source or destination rectangle is valid
// Origin coordinates and size cannot be negative. Size has to be greater than zero
fn is_rect_valid(rect: Rect<f64>) -> bool {
rect.size.width > 0.0 && rect.size.height > 0.0
}
// https://html.spec.whatwg.org/multipage/#serialisation-of-a-colour
fn serialize<W>(color: &RGBA, dest: &mut W) -> fmt::Result where W: fmt::Write {
let red = (color.red * 255.).round() as u8;
let green = (color.green * 255.).round() as u8;
let blue = (color.blue * 255.).round() as u8;
if color.alpha == 1f32 {
write!(dest, "#{:x}{:x}{:x}{:x}{:x}{:x}",
red >> 4, red & 0xF,
green >> 4, green & 0xF,
blue >> 4, blue & 0xF)
} else {
write!(dest, "rgba({}, {}, {}, {})",
red, green, blue, color.alpha)
}
}
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