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
5use canvas_traits::canvas::{
6    CanvasGradientStop, FillOrStrokeStyle, LinearGradientStyle, RadialGradientStyle,
7};
8use dom_struct::dom_struct;
9use js::context::JSContext;
10
11use super::canvas_state::parse_color;
12use crate::dom::bindings::cell::DomRefCell;
13use crate::dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding::CanvasGradientMethods;
14use crate::dom::bindings::error::{Error, ErrorResult};
15use crate::dom::bindings::num::Finite;
16use crate::dom::bindings::reflector::{Reflector, reflect_dom_object_with_cx};
17use crate::dom::bindings::root::DomRoot;
18use crate::dom::bindings::str::DOMString;
19use crate::dom::globalscope::GlobalScope;
20
21// https://html.spec.whatwg.org/multipage/#canvasgradient
22#[dom_struct]
23pub(crate) struct CanvasGradient {
24    reflector_: Reflector,
25    style: CanvasGradientStyle,
26    #[no_trace]
27    stops: DomRefCell<Vec<CanvasGradientStop>>,
28}
29
30#[derive(Clone, JSTraceable, MallocSizeOf)]
31pub(crate) enum CanvasGradientStyle {
32    Linear(#[no_trace] LinearGradientStyle),
33    Radial(#[no_trace] RadialGradientStyle),
34}
35
36impl CanvasGradient {
37    fn new_inherited(style: CanvasGradientStyle) -> CanvasGradient {
38        CanvasGradient {
39            reflector_: Reflector::new(),
40            style,
41            stops: DomRefCell::new(Vec::new()),
42        }
43    }
44
45    pub(crate) fn new(
46        global: &GlobalScope,
47        cx: &mut JSContext,
48        style: CanvasGradientStyle,
49    ) -> DomRoot<CanvasGradient> {
50        reflect_dom_object_with_cx(Box::new(CanvasGradient::new_inherited(style)), global, cx)
51    }
52}
53
54impl CanvasGradientMethods<crate::DomTypeHolder> for CanvasGradient {
55    /// <https://html.spec.whatwg.org/multipage/#dom-canvasgradient-addcolorstop>
56    fn AddColorStop(&self, offset: Finite<f64>, color: DOMString) -> ErrorResult {
57        if *offset < 0f64 || *offset > 1f64 {
58            return Err(Error::IndexSize(None));
59        }
60
61        let color = match parse_color(None, &color) {
62            Ok(color) => color,
63            Err(_) => return Err(Error::Syntax(None)),
64        };
65
66        self.stops.borrow_mut().push(CanvasGradientStop {
67            offset: (*offset),
68            color,
69        });
70        Ok(())
71    }
72}
73
74pub(crate) trait ToFillOrStrokeStyle {
75    fn to_fill_or_stroke_style(self) -> FillOrStrokeStyle;
76}
77
78impl ToFillOrStrokeStyle for &CanvasGradient {
79    fn to_fill_or_stroke_style(self) -> FillOrStrokeStyle {
80        let gradient_stops = self.stops.borrow().clone();
81        match self.style {
82            CanvasGradientStyle::Linear(ref gradient) => {
83                FillOrStrokeStyle::LinearGradient(LinearGradientStyle::new(
84                    gradient.x0,
85                    gradient.y0,
86                    gradient.x1,
87                    gradient.y1,
88                    gradient_stops,
89                ))
90            },
91            CanvasGradientStyle::Radial(ref gradient) => {
92                FillOrStrokeStyle::RadialGradient(RadialGradientStyle::new(
93                    gradient.x0,
94                    gradient.y0,
95                    gradient.r0,
96                    gradient.x1,
97                    gradient.y1,
98                    gradient.r1,
99                    gradient_stops,
100                ))
101            },
102        }
103    }
104}
script/dom/canvas/2d/canvasgradient.rs

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