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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 https://mozilla.org/MPL/2.0/. */
use crate::dom::bindings::cell::DomRefCell;
use crate::dom::bindings::codegen::Bindings::CanvasGradientBinding;
use crate::dom::bindings::codegen::Bindings::CanvasGradientBinding::CanvasGradientMethods;
use crate::dom::bindings::error::{Error, ErrorResult};
use crate::dom::bindings::num::Finite;
use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::str::DOMString;
use crate::dom::globalscope::GlobalScope;
use canvas_traits::canvas::{
CanvasGradientStop, FillOrStrokeStyle, LinearGradientStyle, RadialGradientStyle,
};
use cssparser::Color as CSSColor;
use cssparser::{Parser, ParserInput, RGBA};
use dom_struct::dom_struct;
// https://html.spec.whatwg.org/multipage/#canvasgradient
#[dom_struct]
pub struct CanvasGradient {
reflector_: Reflector,
style: CanvasGradientStyle,
stops: DomRefCell<Vec<CanvasGradientStop>>,
}
#[derive(Clone, JSTraceable, MallocSizeOf)]
pub enum CanvasGradientStyle {
Linear(LinearGradientStyle),
Radial(RadialGradientStyle),
}
impl CanvasGradient {
fn new_inherited(style: CanvasGradientStyle) -> CanvasGradient {
CanvasGradient {
reflector_: Reflector::new(),
style: style,
stops: DomRefCell::new(Vec::new()),
}
}
pub fn new(global: &GlobalScope, style: CanvasGradientStyle) -> DomRoot<CanvasGradient> {
reflect_dom_object(
Box::new(CanvasGradient::new_inherited(style)),
global,
CanvasGradientBinding::Wrap,
)
}
}
impl CanvasGradientMethods for CanvasGradient {
// https://html.spec.whatwg.org/multipage/#dom-canvasgradient-addcolorstop
fn AddColorStop(&self, offset: Finite<f64>, color: DOMString) -> ErrorResult {
if *offset < 0f64 || *offset > 1f64 {
return Err(Error::IndexSize);
}
let mut input = ParserInput::new(&color);
let mut parser = Parser::new(&mut input);
let color = CSSColor::parse(&mut parser);
let color = if parser.is_exhausted() {
match color {
Ok(CSSColor::RGBA(rgba)) => rgba,
Ok(CSSColor::CurrentColor) => RGBA::new(0, 0, 0, 255),
_ => return Err(Error::Syntax),
}
} else {
return Err(Error::Syntax);
};
self.stops.borrow_mut().push(CanvasGradientStop {
offset: (*offset) as f64,
color: color,
});
Ok(())
}
}
pub trait ToFillOrStrokeStyle {
fn to_fill_or_stroke_style(self) -> FillOrStrokeStyle;
}
impl<'a> ToFillOrStrokeStyle for &'a CanvasGradient {
fn to_fill_or_stroke_style(self) -> FillOrStrokeStyle {
let gradient_stops = self.stops.borrow().clone();
match self.style {
CanvasGradientStyle::Linear(ref gradient) => {
FillOrStrokeStyle::LinearGradient(LinearGradientStyle::new(
gradient.x0,
gradient.y0,
gradient.x1,
gradient.y1,
gradient_stops,
))
},
CanvasGradientStyle::Radial(ref gradient) => {
FillOrStrokeStyle::RadialGradient(RadialGradientStyle::new(
gradient.x0,
gradient.y0,
gradient.r0,
gradient.x1,
gradient.y1,
gradient.r1,
gradient_stops,
))
},
}
}
}
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