Mirrors/servo
1
0
Fork 0
mirror of https://github.com/servo/servo.git synced 2025-06-06 16:45:39 +00:00
Code Issues Projects Releases Packages Wiki Activity
servo/components/script/dom/canvasrenderingcontext2d.rs
Mátyás Mustoha ccfff159e7 Canvas: added lineCap and lineJoin support.
2015-04-14 18:26:41 +02:00

890 lines
36 KiB
Rust
Raw Blame History

/* 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, 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_paint_task::{CanvasMsg, CanvasPaintTask, FillOrStrokeStyle};
use canvas::canvas_paint_task::{LinearGradientStyle, RadialGradientStyle};
use canvas::canvas_paint_task::{LineCapStyle, LineJoinStyle};
use net_traits::image::base::Image;
use net_traits::image_cache_task::{ImageResponseMsg, Msg};
use png::PixelsByColorType;
use std::borrow::ToOwned;
use std::cell::Cell;
use std::num::{Float, ToPrimitive};
use std::sync::{Arc};
use std::sync::mpsc::{channel, Sender};
use util::str::DOMString;
use url::Url;
use util::vec::byte_swap;
#[dom_struct]
pub struct CanvasRenderingContext2D {
reflector_: Reflector,
global: GlobalField,
renderer: Sender<CanvasMsg>,
canvas: JS<HTMLCanvasElement>,
global_alpha: Cell<f64>,
image_smoothing_enabled: Cell<bool>,
stroke_color: Cell<RGBA>,
line_width: Cell<f64>,
line_cap: Cell<LineCapStyle>,
line_join: Cell<LineJoinStyle>,
miter_limit: Cell<f64>,
fill_color: Cell<RGBA>,
transform: Cell<Matrix2D<f32>>,
}
impl CanvasRenderingContext2D {
fn new_inherited(global: GlobalRef, canvas: JSRef<HTMLCanvasElement>, size: Size2D<i32>)
-> CanvasRenderingContext2D {
let black = RGBA {
red: 0.0,
green: 0.0,
blue: 0.0,
alpha: 1.0,
};
CanvasRenderingContext2D {
reflector_: Reflector::new(),
global: GlobalField::from_rooted(&global),
renderer: CanvasPaintTask::start(size),
canvas: JS::from_rooted(canvas),
global_alpha: Cell::new(1.0),
image_smoothing_enabled: Cell::new(true),
stroke_color: Cell::new(black),
line_width: Cell::new(1.0),
line_cap: Cell::new(LineCapStyle::Butt),
line_join: Cell::new(LineJoinStyle::Miter),
miter_limit: Cell::new(10.0),
fill_color: Cell::new(black),
transform: Cell::new(Matrix2D::identity()),
}
}
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::Recreate(size)).unwrap();
}
fn update_transform(&self) {
self.renderer.send(CanvasMsg::SetTransform(self.transform.get())).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/scripting.html#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.image_smoothing_enabled.get();
// If the source and target canvas are the same
let msg = if self.canvas.root().r() == canvas {
CanvasMsg::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::GetImageData(source_rect, image_size, sender)).unwrap();
let imagedata = receiver.recv().unwrap();
// Writes pixels to destination canvas
CanvasMsg::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.image_smoothing_enabled.get();
self.renderer.send(CanvasMsg::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
{
let mut pixel_colors = image_data.as_mut_slice();
byte_swap(pixel_colors);
}
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_task = window.image_cache_task().clone();
image_cache_task.send(Msg::Prefetch(url.clone()));
image_cache_task.send(Msg::Decode(url.clone()));
let (response_chan, response_port) = channel();
image_cache_task.send(Msg::WaitForImage(url, response_chan));
match response_port.recv().unwrap() {
ImageResponseMsg::ImageReady(image) => Some(image),
ImageResponseMsg::ImageFailed => None,
_ => panic!("Image Cache: Unknown Result")
}
}
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> {
fn Canvas(self) -> Temporary<HTMLCanvasElement> {
Temporary::new(self.canvas)
}
fn Scale(self, x: f64, y: f64) {
if !(x.is_finite() && y.is_finite()) {
return;
}
self.transform.set(self.transform.get().scale(x as f32, y as f32));
self.update_transform()
}
fn Translate(self, x: f64, y: f64) {
if !(x.is_finite() && y.is_finite()) {
return;
}
self.transform.set(self.transform.get().translate(x as f32, y as f32));
self.update_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;
}
self.transform.set(self.transform.get().mul(&Matrix2D::new(a as f32,
b as f32,
c as f32,
d as f32,
e as f32,
f as f32)));
self.update_transform()
}
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.transform.set(Matrix2D::new(a as f32,
b as f32,
c as f32,
d as f32,
e as f32,
f as f32));
self.update_transform()
}
fn GlobalAlpha(self) -> f64 {
self.global_alpha.get()
}
fn SetGlobalAlpha(self, alpha: f64) {
if !alpha.is_finite() || alpha > 1.0 || alpha < 0.0 {
return;
}
self.global_alpha.set(alpha);
self.renderer.send(CanvasMsg::SetGlobalAlpha(alpha as f32)).unwrap()
}
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::FillRect(rect)).unwrap();
}
}
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::ClearRect(rect)).unwrap();
}
}
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::StrokeRect(rect)).unwrap();
}
}
fn BeginPath(self) {
self.renderer.send(CanvasMsg::BeginPath).unwrap();
}
fn ClosePath(self) {
self.renderer.send(CanvasMsg::ClosePath).unwrap();
}
fn Fill(self, _: CanvasWindingRule) {
self.renderer.send(CanvasMsg::Fill).unwrap();
}
fn Stroke(self) {
self.renderer.send(CanvasMsg::Stroke).unwrap();
}
// https://html.spec.whatwg.org/multipage/scripting.html#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/embedded-content.html#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/scripting.html#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/embedded-content.html#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/scripting.html#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/embedded-content.html#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)
}
}
}
fn MoveTo(self, x: f64, y: f64) {
if !(x.is_finite() && y.is_finite()) {
return;
}
self.renderer.send(CanvasMsg::MoveTo(Point2D(x as f32, y as f32))).unwrap();
}
fn LineTo(self, x: f64, y: f64) {
if !(x.is_finite() && y.is_finite()) {
return;
}
self.renderer.send(CanvasMsg::LineTo(Point2D(x as f32, y as f32))).unwrap();
}
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::QuadraticCurveTo(Point2D(cpx as f32, cpy as f32),
Point2D(x as f32, y as f32))).unwrap();
}
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::BezierCurveTo(Point2D(cp1x as f32, cp1y as f32),
Point2D(cp2x as f32, cp2y as f32),
Point2D(x as f32, y as f32))).unwrap();
}
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::Arc(Point2D(x as f32, y as f32), r as f32,
start as f32, end as f32, ccw)).unwrap();
Ok(())
}
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::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 {
self.image_smoothing_enabled.get()
}
// https://html.spec.whatwg.org/#dom-context-2d-imagesmoothingenabled
fn SetImageSmoothingEnabled(self, value: bool) -> () {
self.image_smoothing_enabled.set(value);
}
fn StrokeStyle(self) -> StringOrCanvasGradientOrCanvasPattern {
// FIXME(pcwalton, #4761): This is not spec-compliant. See:
//
// https://html.spec.whatwg.org/multipage/scripting.html#serialisation-of-a-colour
let mut result = String::new();
self.stroke_color.get().to_css(&mut result).unwrap();
StringOrCanvasGradientOrCanvasPattern::eString(result)
}
fn SetStrokeStyle(self, value: StringOrCanvasGradientOrCanvasPattern) {
match value {
StringOrCanvasGradientOrCanvasPattern::eString(string) => {
match parse_color(&string) {
Ok(rgba) => {
self.stroke_color.set(rgba);
self.renderer
.send(CanvasMsg::SetStrokeStyle(FillOrStrokeStyle::Color(rgba)))
.unwrap();
}
_ => {}
}
}
_ => {
// TODO(pcwalton)
}
}
}
fn FillStyle(self) -> StringOrCanvasGradientOrCanvasPattern {
// FIXME(pcwalton, #4761): This is not spec-compliant. See:
//
// https://html.spec.whatwg.org/multipage/scripting.html#serialisation-of-a-colour
let mut result = String::new();
self.stroke_color.get().to_css(&mut result).unwrap();
StringOrCanvasGradientOrCanvasPattern::eString(result)
}
fn SetFillStyle(self, value: StringOrCanvasGradientOrCanvasPattern) {
match value {
StringOrCanvasGradientOrCanvasPattern::eString(string) => {
match parse_color(&string) {
Ok(rgba) => {
self.fill_color.set(rgba);
self.renderer
.send(CanvasMsg::SetFillStyle(FillOrStrokeStyle::Color(rgba)))
.unwrap()
}
_ => {}
}
}
StringOrCanvasGradientOrCanvasPattern::eCanvasGradient(gradient) => {
self.renderer.send(CanvasMsg::SetFillStyle(gradient.root().r().to_fill_or_stroke_style())).unwrap();
}
_ => {}
}
}
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))
}
fn CreateImageData_(self, imagedata: JSRef<ImageData>) -> Fallible<Temporary<ImageData>> {
Ok(ImageData::new(self.global.root().r(), imagedata.Width(), imagedata.Height(), None))
}
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::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)))
}
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::PutImageData(data, image_data_rect, dirty_rect)).unwrap()
}
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::PutImageData(data, image_data_rect, dirty_rect)).unwrap()
}
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()))))
}
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()))))
}
fn LineWidth(self) -> f64 {
self.line_width.get()
}
fn SetLineWidth(self, width: f64) {
if !width.is_finite() || width <= 0.0 {
return;
}
self.line_width.set(width);
self.renderer.send(CanvasMsg::SetLineWidth(width as f32)).unwrap()
}
fn LineCap(self) -> DOMString {
match self.line_cap.get() {
LineCapStyle::Butt => "butt".to_owned(),
LineCapStyle::Round => "round".to_owned(),
LineCapStyle::Square => "square".to_owned(),
}
}
fn SetLineCap(self, cap_str: DOMString) {
if let Some(cap) = LineCapStyle::from_str(&cap_str) {
self.line_cap.set(cap);
self.renderer.send(CanvasMsg::SetLineCap(cap)).unwrap()
}
}
fn LineJoin(self) -> DOMString {
match self.line_join.get() {
LineJoinStyle::Round => "round".to_owned(),
LineJoinStyle::Bevel => "bevel".to_owned(),
LineJoinStyle::Miter => "miter".to_owned(),
}
}
fn SetLineJoin(self, join_str: DOMString) {
if let Some(join) = LineJoinStyle::from_str(&join_str) {
self.line_join.set(join);
self.renderer.send(CanvasMsg::SetLineJoin(join)).unwrap()
}
}
fn MiterLimit(self) -> f64 {
self.miter_limit.get()
}
fn SetMiterLimit(self, limit: f64) {
if !limit.is_finite() || limit <= 0.0 {
return;
}
self.miter_limit.set(limit);
self.renderer.send(CanvasMsg::SetMiterLimit(limit as f32)).unwrap()
}
}
#[unsafe_destructor]
impl Drop for CanvasRenderingContext2D {
fn drop(&mut self) {
self.renderer.send(CanvasMsg::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
}
Reference in a new issue View git blame Copy permalink