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servo/components/script/dom/canvasrenderingcontext2d.rs
Mátyás Mustoha 9302aaab96 Canvas: implement transformation matrix reset.
2015-05-06 20:37:14 +02:00

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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 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::{IndexSize, NotSupported, Type, InvalidState};
use dom::bindings::error::Fallible;
use dom::bindings::global::{GlobalRef, GlobalField};
use dom::bindings::js::{JS, JSRef, LayoutJS, Rootable, Temporary};
use dom::bindings::num::Finite;
use dom::bindings::utils::{Reflector, reflect_dom_object};
use dom::canvasgradient::{CanvasGradient, CanvasGradientStyle, ToFillOrStrokeStyle};
use dom::htmlcanvaselement::{HTMLCanvasElement, HTMLCanvasElementHelpers};
use dom::htmlimageelement::{HTMLImageElement, HTMLImageElementHelpers};
use dom::imagedata::{ImageData, ImageDataHelpers};
use dom::node::{window_from_node};
use cssparser::Color as CSSColor;
use cssparser::{Parser, RGBA, ToCss};
use geom::matrix2d::Matrix2D;
use geom::point::Point2D;
use geom::rect::Rect;
use geom::size::Size2D;
use canvas::canvas_msg::{CanvasMsg, Canvas2dMsg, CanvasCommonMsg};
use canvas::canvas_paint_task::{CanvasPaintTask, FillOrStrokeStyle};
use canvas::canvas_paint_task::{LinearGradientStyle, RadialGradientStyle};
use canvas::canvas_paint_task::{LineCapStyle, LineJoinStyle, CompositionOrBlending};
use net_traits::image::base::Image;
use net_traits::image_cache_task::ImageCacheChan;
use png::PixelsByColorType;
use num::{Float, ToPrimitive};
use std::borrow::ToOwned;
use std::cell::RefCell;
use std::sync::{Arc};
use std::sync::mpsc::{channel, Sender};
use util::str::DOMString;
use url::Url;
use util::vec::byte_swap;
// https://html.spec.whatwg.org/multipage/#canvasrenderingcontext2d
#[dom_struct]
pub struct CanvasRenderingContext2D {
reflector_: Reflector,
global: GlobalField,
renderer: Sender<CanvasMsg>,
canvas: JS<HTMLCanvasElement>,
state: RefCell<CanvasContextState>,
saved_states: RefCell<Vec<CanvasContextState>>,
}
#[derive(Clone)]
#[jstraceable]
struct CanvasContextState {
global_alpha: f64,
global_composition: CompositionOrBlending,
image_smoothing_enabled: bool,
stroke_color: RGBA,
line_width: f64,
line_cap: LineCapStyle,
line_join: LineJoinStyle,
miter_limit: f64,
fill_color: RGBA,
transform: Matrix2D<f32>,
}
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,
stroke_color: black,
line_width: 1.0,
line_cap: LineCapStyle::Butt,
line_join: LineJoinStyle::Miter,
miter_limit: 10.0,
fill_color: black,
transform: Matrix2D::identity(),
}
}
}
impl CanvasRenderingContext2D {
fn new_inherited(global: GlobalRef, canvas: JSRef<HTMLCanvasElement>, size: Size2D<i32>)
-> CanvasRenderingContext2D {
CanvasRenderingContext2D {
reflector_: Reflector::new(),
global: GlobalField::from_rooted(&global),
renderer: CanvasPaintTask::start(size),
canvas: JS::from_rooted(canvas),
state: RefCell::new(CanvasContextState::new()),
saved_states: RefCell::new(Vec::new()),
}
}
pub fn new(global: GlobalRef, canvas: JSRef<HTMLCanvasElement>, size: Size2D<i32>)
-> Temporary<CanvasRenderingContext2D> {
reflect_dom_object(box CanvasRenderingContext2D::new_inherited(global, canvas, size),
global, CanvasRenderingContext2DBinding::Wrap)
}
pub fn recreate(&self, size: Size2D<i32>) {
self.renderer.send(CanvasMsg::Common(CanvasCommonMsg::Recreate(size))).unwrap();
}
fn update_transform(&self) {
self.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(Point2D(0f64, 0f64),
Size2D(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(Point2D(sx, sy),
Size2D(sw, sh));
// 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(Point2D(dx, dy),
Size2D(dest_rect_width_scaled, dest_rect_height_scaled));
let source_rect = Rect(Point2D(source_rect_clipped.origin.x,
source_rect_clipped.origin.y),
Size2D(source_rect_clipped.size.width,
source_rect_clipped.size.height));
return (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_html_canvas_element(&self,
canvas: JSRef<HTMLCanvasElement>,
sx: f64, sy: f64, sw: f64, sh: f64,
dx: f64, dy: f64, dw: f64, dh: f64) -> Fallible<()> {
// 1. Check the usability of the image argument
if !canvas.is_valid() {
return Err(InvalidState)
}
let canvas_size = canvas.get_size();
let image_size = Size2D(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(IndexSize)
}
let smoothing_enabled = self.state.borrow().image_smoothing_enabled;
// If the source and target canvas are the same
let msg = if self.canvas.root().r() == canvas {
CanvasMsg::Canvas2d(Canvas2dMsg::DrawImageSelf(image_size, dest_rect, source_rect, smoothing_enabled))
} else { // Source and target canvases are different
let context = canvas.get_2d_context().root();
let renderer = context.r().get_renderer();
let (sender, receiver) = channel::<Vec<u8>>();
// Reads pixels from source image
renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::GetImageData(source_rect, 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.renderer.send(msg).unwrap();
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(IndexSize)
}
let smoothing_enabled = self.state.borrow().image_smoothing_enabled;
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::DrawImage(
image_data, image_size, dest_rect,
source_rect, smoothing_enabled))).unwrap();
Ok(())
}
fn fetch_image_data(&self,
image_element: &JSRef<HTMLImageElement>)
-> Option<(Vec<u8>, Size2D<f64>)> {
let url = match image_element.get_url() {
Some(url) => url,
None => return None,
};
let img = match self.request_image_from_cache(url) {
Some(img) => img,
None => return None,
};
let image_size = Size2D(img.width as f64, img.height as f64);
let mut image_data = match img.pixels {
PixelsByColorType::RGBA8(ref pixels) => pixels.to_vec(),
PixelsByColorType::K8(_) => panic!("K8 color type not supported"),
PixelsByColorType::RGB8(_) => panic!("RGB8 color type not supported"),
PixelsByColorType::KA8(_) => panic!("KA8 color type not supported"),
};
// Pixels come from cache in BGRA order and drawImage expects RGBA so we
// have to swap the color values
byte_swap(&mut image_data);
return Some((image_data, image_size));
}
fn request_image_from_cache(&self, url: Url) -> Option<Arc<Image>> {
let canvas = self.canvas.root();
let window = window_from_node(canvas.r()).root();
let window = window.r();
let image_cache = window.image_cache_task();
let (response_chan, response_port) = channel();
image_cache.request_image(url, ImageCacheChan(response_chan), None);
let result = response_port.recv().unwrap();
result.image
}
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(Point2D(x as f32, y as f32), Size2D(w as f32, h as f32)))
}
}
pub trait CanvasRenderingContext2DHelpers {
fn get_renderer(&self) -> Sender<CanvasMsg>;
}
impl CanvasRenderingContext2DHelpers for CanvasRenderingContext2D {
fn get_renderer(&self) -> Sender<CanvasMsg> {
self.renderer.clone()
}
}
pub trait LayoutCanvasRenderingContext2DHelpers {
#[allow(unsafe_code)]
unsafe fn get_renderer(&self) -> Sender<CanvasMsg>;
}
impl LayoutCanvasRenderingContext2DHelpers for LayoutJS<CanvasRenderingContext2D> {
#[allow(unsafe_code)]
unsafe fn get_renderer(&self) -> Sender<CanvasMsg> {
(*self.unsafe_get()).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<'a> CanvasRenderingContext2DMethods for JSRef<'a, CanvasRenderingContext2D> {
// https://html.spec.whatwg.org/multipage/#dom-context-2d-canvas
fn Canvas(self) -> Temporary<HTMLCanvasElement> {
Temporary::from_rooted(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.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SaveContext)).unwrap();
}
// 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.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.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 Some(op) = CompositionOrBlending::from_str(&op_str) {
self.state.borrow_mut().global_composition = op;
self.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.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::FillRect(rect))).unwrap();
}
}
// 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.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::ClearRect(rect))).unwrap();
}
}
// 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.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::StrokeRect(rect))).unwrap();
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-beginpath
fn BeginPath(self) {
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::BeginPath)).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-closepath
fn ClosePath(self) {
self.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.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::Fill)).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-stroke
fn Stroke(self) {
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::Stroke)).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-clip
fn Clip(self, _: CanvasWindingRule) {
// TODO: Process winding rule
self.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(());
}
// From rules described in the spec:
// If the sx, sy, sw, and sh arguments are omitted, they must default to 0, 0,
// the image's intrinsic width in image pixels,
// and the image's intrinsic height in image pixels, respectively
let sx: f64 = 0f64;
let sy: f64 = 0f64;
match image {
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eHTMLCanvasElement(image) => {
let canvas = image.root();
let canvas_size = canvas.r().get_size();
let dw: f64 = canvas_size.width as f64;
let dh: f64 = canvas_size.height as f64;
let sw: f64 = dw;
let sh: f64 = dh;
return self.draw_html_canvas_element(canvas.r(),
sx, sy, sw, sh,
dx, dy, dw, dh)
}
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eCanvasRenderingContext2D(image) => {
let image = image.root();
let context = image.r();
let canvas = context.Canvas().root();
let canvas_size = canvas.r().get_size();
let dw: f64 = canvas_size.width as f64;
let dh: f64 = canvas_size.height as f64;
let sw: f64 = dw;
let sh: f64 = dh;
return self.draw_html_canvas_element(canvas.r(),
sx, sy, sw, sh,
dx, dy, dw, dh)
}
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eHTMLImageElement(image) => {
let image = image.root();
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((data, size)) => (data, size),
None => return Err(InvalidState),
};
let dw: f64 = image_size.width as f64;
let dh: f64 = image_size.height as f64;
let sw: f64 = dw;
let sh: f64 = dh;
return self.draw_image_data(image_data,
image_size,
sx, sy, sw, sh,
dx, dy, dw, dh)
}
}
}
// 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(());
}
// From rules described in the spec:
// If the sx, sy, sw, and sh arguments are omitted, they must default to 0, 0,
// the image's intrinsic width in image pixels,
// and the image's intrinsic height in image pixels, respectively
let sx: f64 = 0f64;
let sy: f64 = 0f64;
match image {
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eHTMLCanvasElement(image) => {
let canvas = image.root();
let canvas_size = canvas.r().get_size();
let sw: f64 = canvas_size.width as f64;
let sh: f64 = canvas_size.height as f64;
return self.draw_html_canvas_element(canvas.r(),
sx, sy, sw, sh,
dx, dy, dw, dh)
}
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eCanvasRenderingContext2D(image) => {
let image = image.root();
let context = image.r();
let canvas = context.Canvas().root();
let canvas_size = canvas.r().get_size();
let sw: f64 = canvas_size.width as f64;
let sh: f64 = canvas_size.height as f64;
return self.draw_html_canvas_element(canvas.r(),
sx, sy, sw, sh,
dx, dy, dw, dh)
}
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eHTMLImageElement(image) => {
let image = image.root();
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((data, size)) => (data, size),
None => return Err(InvalidState),
};
let sw: f64 = image_size.width as f64;
let sh: f64 = image_size.height as f64;
return self.draw_image_data(image_data,
image_size,
sx, sy, sw, sh,
dx, dy, dw, 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(());
}
match image {
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eHTMLCanvasElement(image) => {
let canvas = image.root();
return self.draw_html_canvas_element(canvas.r(),
sx, sy, sw, sh,
dx, dy, dw, dh)
}
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eCanvasRenderingContext2D(image) => {
let image = image.root();
let context = image.r();
let canvas = context.Canvas().root();
return self.draw_html_canvas_element(canvas.r(),
sx, sy, sw, sh,
dx, dy, dw, dh)
}
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eHTMLImageElement(image) => {
let image = image.root();
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((data, size)) => (data, size),
None => return Err(InvalidState),
};
return self.draw_image_data(image_data,
image_size,
sx, sy, sw, sh,
dx, dy, dw, 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;
}
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::MoveTo(Point2D(x as f32, y as f32)))).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;
}
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::LineTo(Point2D(x as f32, y as f32)))).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(Point2D(x as f32, y as f32),
Size2D(width as f32, height as f32));
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::Rect(rect))).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;
}
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::QuadraticCurveTo(Point2D(cpx as f32, cpy as f32),
Point2D(x as f32, y as f32)))).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;
}
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::BezierCurveTo(Point2D(cp1x as f32, cp1y as f32),
Point2D(cp2x as f32, cp2y as f32),
Point2D(x as f32, y as f32)))).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-arc
fn Arc(self, x: Finite<f64>, y: Finite<f64>, r: Finite<f64>,
start: Finite<f64>, end: Finite<f64>, ccw: bool) -> Fallible<()> {
let x = *x;
let y = *y;
let r = *r;
let start = *start;
let end = *end;
if r < 0.0 {
return Err(IndexSize);
}
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::Arc(Point2D(x as f32, y as f32), r as f32,
start as f32, end as f32, ccw))).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(IndexSize);
}
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::ArcTo(Point2D(cp1x as f32, cp1y as f32),
Point2D(cp2x as f32, cp2y as f32),
r as f32))).unwrap();
Ok(())
}
// https://html.spec.whatwg.org/#dom-context-2d-imagesmoothingenabled
fn ImageSmoothingEnabled(self) -> bool {
let state = self.state.borrow();
state.image_smoothing_enabled
}
// https://html.spec.whatwg.org/#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 {
// FIXME(pcwalton, #4761): This is not spec-compliant. See:
//
// https://html.spec.whatwg.org/multipage/#serialisation-of-a-colour
let mut result = String::new();
self.state.borrow().stroke_color.to_css(&mut result).unwrap();
StringOrCanvasGradientOrCanvasPattern::eString(result)
}
// 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_color = rgba;
self.renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetStrokeStyle(FillOrStrokeStyle::Color(rgba))))
.unwrap();
}
_ => {}
}
}
_ => {
// TODO(pcwalton)
}
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-strokestyle
fn FillStyle(self) -> StringOrCanvasGradientOrCanvasPattern {
// FIXME(pcwalton, #4761): This is not spec-compliant. See:
//
// https://html.spec.whatwg.org/multipage/#serialisation-of-a-colour
let mut result = String::new();
self.state.borrow().stroke_color.to_css(&mut result).unwrap();
StringOrCanvasGradientOrCanvasPattern::eString(result)
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-strokestyle
fn SetFillStyle(self, value: StringOrCanvasGradientOrCanvasPattern) {
match value {
StringOrCanvasGradientOrCanvasPattern::eString(string) => {
match parse_color(&string) {
Ok(rgba) => {
self.state.borrow_mut().fill_color = rgba;
self.renderer
.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetFillStyle(FillOrStrokeStyle::Color(rgba))))
.unwrap()
}
_ => {}
}
}
StringOrCanvasGradientOrCanvasPattern::eCanvasGradient(gradient) => {
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetFillStyle(gradient.root().r().to_fill_or_stroke_style()))).unwrap();
}
_ => {}
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-createimagedata
fn CreateImageData(self, sw: f64, sh: f64) -> Fallible<Temporary<ImageData>> {
if !(sw.is_finite() && sh.is_finite()) {
return Err(NotSupported);
}
if sw == 0.0 || sh == 0.0 {
return Err(IndexSize)
}
Ok(ImageData::new(self.global.root().r(), sw.abs().to_u32().unwrap(), sh.abs().to_u32().unwrap(), None))
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-createimagedata
fn CreateImageData_(self, imagedata: JSRef<ImageData>) -> Fallible<Temporary<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<Temporary<ImageData>> {
let sx = *sx;
let sy = *sy;
let sw = *sw;
let sh = *sh;
if sw == 0.0 || sh == 0.0 {
return Err(IndexSize)
}
let (sender, receiver) = channel::<Vec<u8>>();
let dest_rect = Rect(Point2D(sx as f64, sy as f64), Size2D(sw as f64, sh as f64));
let canvas_size = self.canvas.root().r().get_size();
let canvas_size = Size2D(canvas_size.width as f64, canvas_size.height as f64);
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::GetImageData(dest_rect, canvas_size, sender))).unwrap();
let data = receiver.recv().unwrap();
Ok(ImageData::new(self.global.root().r(), sw.abs().to_u32().unwrap(), sh.abs().to_u32().unwrap(), Some(data)))
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-putimagedata
fn PutImageData(self, imagedata: JSRef<ImageData>, dx: Finite<f64>, dy: Finite<f64>) {
let dx = *dx;
let dy = *dy;
// XXX:
// By the spec: http://www.w3.org/html/wg/drafts/2dcontext/html5_canvas_CR/#dom-context-2d-putimagedata
// "If any of the arguments to the method are infinite or NaN, the method must throw a NotSupportedError exception"
// But this arguments are stricted value, so if they are not finite values,
// they will be TypeError by WebIDL spec before call this methods.
let data = imagedata.get_data_array(&self.global.root().r());
let image_data_size = imagedata.get_size();
let image_data_size = Size2D(image_data_size.width as f64, image_data_size.height as f64);
let image_data_rect = Rect(Point2D(dx, dy), image_data_size);
let dirty_rect = None;
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::PutImageData(data, image_data_rect, dirty_rect))).unwrap()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-putimagedata
fn PutImageData_(self, imagedata: JSRef<ImageData>, dx: Finite<f64>, dy: Finite<f64>,
dirtyX: Finite<f64>, dirtyY: Finite<f64>, dirtyWidth: Finite<f64>, dirtyHeight: Finite<f64>) {
let dx = *dx;
let dy = *dy;
let dirtyX = *dirtyX;
let dirtyY = *dirtyY;
let dirtyWidth = *dirtyWidth;
let dirtyHeight = *dirtyHeight;
// XXX:
// By the spec: http://www.w3.org/html/wg/drafts/2dcontext/html5_canvas_CR/#dom-context-2d-putimagedata
// "If any of the arguments to the method are infinite or NaN, the method must throw a NotSupportedError exception"
// But this arguments are stricted value, so if they are not finite values,
// they will be TypeError by WebIDL spec before call this methods.
let data = imagedata.get_data_array(&self.global.root().r());
let image_data_rect = Rect(Point2D(dx, dy),
Size2D(imagedata.Width() as f64,
imagedata.Height() as f64));
let dirty_rect = Some(Rect(Point2D(dirtyX, dirtyY),
Size2D(dirtyWidth, dirtyHeight)));
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::PutImageData(data, image_data_rect, dirty_rect))).unwrap()
}
// 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>) -> Fallible<Temporary<CanvasGradient>> {
let x0 = *x0;
let y0 = *y0;
let x1 = *x1;
let y1 = *y1;
if [x0, y0, x1, y1].iter().any(|x| x.is_nan() || x.is_infinite()) {
return Err(Type("One of the arguments of createLinearGradient() is not a finite floating-point value.".to_owned()));
}
Ok(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<Temporary<CanvasGradient>> {
let x0 = *x0;
let y0 = *y0;
let r0 = *r0;
let x1 = *x1;
let y1 = *y1;
let r1 = *r1;
if [x0, y0, r0, x1, y1, r1].iter().any(|x| x.is_nan() || x.is_infinite()) {
return Err(Type("One of the arguments of createRadialGradient() is not a finite floating-point value.".to_owned()));
}
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-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.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 Some(cap) = LineCapStyle::from_str(&cap_str) {
self.state.borrow_mut().line_cap = cap;
self.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 Some(join) = LineJoinStyle::from_str(&join_str) {
self.state.borrow_mut().line_join = join;
self.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.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetMiterLimit(limit as f32))).unwrap()
}
}
impl Drop for CanvasRenderingContext2D {
fn drop(&mut self) {
self.renderer.send(CanvasMsg::Common(CanvasCommonMsg::Close)).unwrap();
}
}
pub fn parse_color(string: &str) -> Result<RGBA,()> {
match CSSColor::parse(&mut Parser::new(&string)) {
Ok(CSSColor::RGBA(rgba)) => Ok(rgba),
_ => 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
}
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