script/dom/canvas/2d/
canvasgradient.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5#![cfg_attr(crown, allow(crown::jscontext_first_arg))]
6
7use dom_struct::dom_struct;
8use js::context::JSContext;
9use script_bindings::cell::DomRefCell;
10use script_bindings::reflector::{Reflector, reflect_dom_object_with_cx};
11use servo_canvas_traits::canvas::{
12    CanvasGradientStop, FillOrStrokeStyle, LinearGradientStyle, RadialGradientStyle,
13};
14
15use super::canvas_state::parse_color;
16use crate::dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding::CanvasGradientMethods;
17use crate::dom::bindings::error::{Error, ErrorResult};
18use crate::dom::bindings::num::Finite;
19use crate::dom::bindings::root::DomRoot;
20use crate::dom::bindings::str::DOMString;
21use crate::dom::globalscope::GlobalScope;
22
23// https://html.spec.whatwg.org/multipage/#canvasgradient
24#[dom_struct]
25pub(crate) struct CanvasGradient {
26    reflector_: Reflector,
27    style: CanvasGradientStyle,
28    #[no_trace]
29    stops: DomRefCell<Vec<CanvasGradientStop>>,
30}
31
32#[derive(Clone, JSTraceable, MallocSizeOf)]
33pub(crate) enum CanvasGradientStyle {
34    Linear(#[no_trace] LinearGradientStyle),
35    Radial(#[no_trace] RadialGradientStyle),
36}
37
38impl CanvasGradient {
39    fn new_inherited(style: CanvasGradientStyle) -> CanvasGradient {
40        CanvasGradient {
41            reflector_: Reflector::new(),
42            style,
43            stops: DomRefCell::new(Vec::new()),
44        }
45    }
46
47    pub(crate) fn new(
48        global: &GlobalScope,
49        cx: &mut JSContext,
50        style: CanvasGradientStyle,
51    ) -> DomRoot<CanvasGradient> {
52        reflect_dom_object_with_cx(Box::new(CanvasGradient::new_inherited(style)), global, cx)
53    }
54}
55
56impl CanvasGradientMethods<crate::DomTypeHolder> for CanvasGradient {
57    /// <https://html.spec.whatwg.org/multipage/#dom-canvasgradient-addcolorstop>
58    fn AddColorStop(&self, offset: Finite<f64>, color: DOMString) -> ErrorResult {
59        if *offset < 0f64 || *offset > 1f64 {
60            return Err(Error::IndexSize(None));
61        }
62
63        let color = match parse_color(None, &color) {
64            Ok(color) => color,
65            Err(_) => return Err(Error::Syntax(None)),
66        };
67
68        self.stops.borrow_mut().push(CanvasGradientStop {
69            offset: (*offset),
70            color,
71        });
72        Ok(())
73    }
74}
75
76pub(crate) trait ToFillOrStrokeStyle {
77    fn to_fill_or_stroke_style(self) -> FillOrStrokeStyle;
78}
79
80impl ToFillOrStrokeStyle for &CanvasGradient {
81    fn to_fill_or_stroke_style(self) -> FillOrStrokeStyle {
82        let gradient_stops = self.stops.borrow().clone();
83        match self.style {
84            CanvasGradientStyle::Linear(ref gradient) => {
85                FillOrStrokeStyle::LinearGradient(LinearGradientStyle::new(
86                    gradient.x0,
87                    gradient.y0,
88                    gradient.x1,
89                    gradient.y1,
90                    gradient_stops,
91                ))
92            },
93            CanvasGradientStyle::Radial(ref gradient) => {
94                FillOrStrokeStyle::RadialGradient(RadialGradientStyle::new(
95                    gradient.x0,
96                    gradient.y0,
97                    gradient.r0,
98                    gradient.x1,
99                    gradient.y1,
100                    gradient.r1,
101                    gradient_stops,
102                ))
103            },
104        }
105    }
106}
script/dom/canvas/2d/canvasgradient.rs

script/dom/canvas/2d/
canvasgradient.rs
