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servo/components/script/dom/canvasrenderingcontext2d.rs
David Winslow 4cf46bff2d Refactor #[jstraceable] to #[derive(JSTraceable)] 
fixes #6524
2015-07-01 18:27:06 -04:00

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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::InheritTypes::NodeCast;
use dom::bindings::codegen::UnionTypes::HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D;
use dom::bindings::codegen::UnionTypes::StringOrCanvasGradientOrCanvasPattern;
use dom::bindings::error::Error::{IndexSize, NotSupported, Type, InvalidState, Syntax};
use dom::bindings::error::Fallible;
use dom::bindings::global::{GlobalRef, GlobalField};
use dom::bindings::js::{JS, LayoutJS, Root};
use dom::bindings::num::Finite;
use dom::bindings::utils::{Reflector, reflect_dom_object};
use dom::canvasgradient::{CanvasGradient, CanvasGradientStyle, ToFillOrStrokeStyle};
use dom::canvaspattern::CanvasPattern;
use dom::htmlcanvaselement::{HTMLCanvasElement, HTMLCanvasElementHelpers};
use dom::htmlimageelement::{HTMLImageElement, HTMLImageElementHelpers};
use dom::imagedata::{ImageData, ImageDataHelpers};
use dom::node::{window_from_node, NodeHelpers, NodeDamage};
use cssparser::Color as CSSColor;
use cssparser::{Parser, RGBA};
use euclid::matrix2d::Matrix2D;
use euclid::point::Point2D;
use euclid::rect::Rect;
use euclid::size::Size2D;
use canvas_traits::{CanvasMsg, Canvas2dMsg, CanvasCommonMsg};
use canvas_traits::{FillOrStrokeStyle, LinearGradientStyle, RadialGradientStyle, RepetitionStyle};
use canvas_traits::{LineCapStyle, LineJoinStyle, CompositionOrBlending};
use canvas::canvas_paint_task::CanvasPaintTask;
use net_traits::image_cache_task::{ImageCacheChan, ImageResponse};
use png::PixelsByColorType;
use num::{Float, ToPrimitive};
use std::borrow::ToOwned;
use std::cell::RefCell;
use std::fmt;
use std::sync::mpsc::{channel, Sender};
use util::str::DOMString;
use url::Url;
use util::vec::byte_swap;
#[must_root]
#[derive(JSTraceable, Clone)]
pub 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: Sender<CanvasMsg>,
canvas: JS<HTMLCanvasElement>,
state: RefCell<CanvasContextState>,
saved_states: RefCell<Vec<CanvasContextState>>,
}
#[must_root]
#[derive(JSTraceable, Clone)]
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 {
CanvasRenderingContext2D {
reflector_: Reflector::new(),
global: GlobalField::from_rooted(&global),
renderer: CanvasPaintTask::start(size),
canvas: JS::from_ref(canvas),
state: RefCell::new(CanvasContextState::new()),
saved_states: RefCell::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.renderer.send(CanvasMsg::Common(CanvasCommonMsg::Recreate(size))).unwrap();
}
fn mark_as_dirty(&self) {
let canvas = self.canvas.root();
let node = NodeCast::from_ref(canvas.r());
node.dirty(NodeDamage::OtherNodeDamage);
}
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::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));
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: &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::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(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 = match canvas.get_or_init_2d_context() {
Some(context) => context,
None => return Err(InvalidState),
};
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();
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(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();
self.mark_as_dirty();
Ok(())
}
fn fetch_image_data(&self,
image_element: &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) {
ImageResponse::Loaded(img) => img,
ImageResponse::PlaceholderLoaded(_) | ImageResponse::None => return None,
};
let image_size = Size2D::new(img.width as f64, img.height as f64);
let 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"),
};
return Some((image_data, image_size));
}
fn fetch_canvas_data(&self,
canvas_element: &HTMLCanvasElement,
source_rect: Rect<f64>)
-> Option<(Vec<u8>, Size2D<f64>)> {
let context = match canvas_element.get_or_init_2d_context() {
Some(context) => context,
None => return None,
};
let canvas_size = canvas_element.get_size();
let image_size = Size2D::new(canvas_size.width as f64, canvas_size.height as f64);
let renderer = context.r().get_renderer();
let (sender, receiver) = channel::<Vec<u8>>();
// Reads pixels from source canvas
renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::GetImageData(source_rect, image_size, sender))).unwrap();
return Some((receiver.recv().unwrap(), image_size));
}
fn request_image_from_cache(&self, url: Url) -> ImageResponse {
let canvas = self.canvas.root();
let window = window_from_node(canvas.r());
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_response
}
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 trait CanvasRenderingContext2DHelpers {
fn get_renderer(self) -> Sender<CanvasMsg>;
}
impl<'a> CanvasRenderingContext2DHelpers for &'a 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 &'a CanvasRenderingContext2D {
// https://html.spec.whatwg.org/multipage/#dom-context-2d-canvas
fn Canvas(self) -> Root<HTMLCanvasElement> {
self.canvas.root()
}
// 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();
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.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.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.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();
self.mark_as_dirty();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-stroke
fn Stroke(self) {
self.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.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(canvas) => {
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 context = image.r();
let canvas = context.Canvas();
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_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);
(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(canvas) => {
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 context = image.r();
let canvas = context.Canvas();
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_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);
(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) => {
return self.draw_html_canvas_element(image.r(),
sx, sy, sw, sh,
dx, dy, dw, dh)
}
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eCanvasRenderingContext2D(image) => {
let context = image.r();
let canvas = context.Canvas();
return 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);
(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;
}
let msg = CanvasMsg::Canvas2d(
Canvas2dMsg::MoveTo(
Point2D::new(x as f32, y as f32)));
self.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.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.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.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.renderer.send(msg).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);
}
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.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(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.renderer.send(msg).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 {
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(gradient) => {
StringOrCanvasGradientOrCanvasPattern::eCanvasGradient(gradient.root())
},
}
}
// 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.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.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(gradient) => {
StringOrCanvasGradientOrCanvasPattern::eCanvasGradient(gradient.root())
},
}
}
// 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_style = CanvasFillOrStrokeStyle::Color(rgba);
self.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.renderer.send(msg).unwrap();
}
StringOrCanvasGradientOrCanvasPattern::eCanvasPattern(pattern) => {
self.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: f64, sh: f64) -> Fallible<Root<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: &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 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::new(Point2D::new(sx as f64, sy as f64),
Size2D::new(sw as f64, sh as f64));
let canvas_size = self.canvas.root().r().get_size();
let canvas_size = Size2D::new(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: &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::new(image_data_size.width as f64, image_data_size.height as f64);
let image_data_rect = Rect::new(Point2D::new(dx, dy), image_data_size);
let dirty_rect = None;
let msg = CanvasMsg::Canvas2d(Canvas2dMsg::PutImageData(data, image_data_rect, dirty_rect));
self.renderer.send(msg).unwrap();
self.mark_as_dirty();
}
// 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 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::new(Point2D::new(dx, dy),
Size2D::new(imagedata.Width() as f64,
imagedata.Height() as f64));
let dirty_rect = Some(Rect::new(Point2D::new(dirtyX, dirtyY),
Size2D::new(dirtyWidth, dirtyHeight)));
let msg = CanvasMsg::Canvas2d(Canvas2dMsg::PutImageData(data, image_data_rect, dirty_rect));
self.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>) -> Fallible<Root<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<Root<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-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(InvalidState),
}
},
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eHTMLCanvasElement(canvas) => {
let canvas_element = canvas.r();
let canvas_size = canvas_element.get_size();
let source_rect = Rect::new(Point2D::zero(),
Size2D::new(canvas_size.width as f64, canvas_size.height as f64));
match self.fetch_canvas_data(&canvas_element, source_rect) {
Some((data, size)) => (data, size),
None => return Err(InvalidState),
}
},
HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D::eCanvasRenderingContext2D(context) => {
let canvas = context.r().Canvas();
let canvas_element = canvas.r();
let canvas_size = canvas_element.get_size();
let source_rect = Rect::new(Point2D::zero(),
Size2D::new(canvas_size.width as f64, canvas_size.height as f64));
match self.fetch_canvas_data(&canvas_element, source_rect) {
Some((data, size)) => (data, size),
None => return Err(InvalidState),
}
},
};
if let Some(rep) = RepetitionStyle::from_str(&repetition) {
return Ok(CanvasPattern::new(self.global.root().r(),
image_data,
Size2D::new(image_size.width as i32, image_size.height as i32),
rep));
}
return Err(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.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()
}
// 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.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.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.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.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetShadowColor(color))).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,()> {
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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