script/dom/
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;
9
10use crate::canvas_state::parse_color;
11use crate::dom::bindings::cell::DomRefCell;
12use crate::dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding::CanvasGradientMethods;
13use crate::dom::bindings::error::{Error, ErrorResult};
14use crate::dom::bindings::num::Finite;
15use crate::dom::bindings::reflector::{Reflector, reflect_dom_object};
16use crate::dom::bindings::root::DomRoot;
17use crate::dom::bindings::str::DOMString;
18use crate::dom::globalscope::GlobalScope;
19use crate::script_runtime::CanGc;
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        style: CanvasGradientStyle,
48        can_gc: CanGc,
49    ) -> DomRoot<CanvasGradient> {
50        reflect_dom_object(
51            Box::new(CanvasGradient::new_inherited(style)),
52            global,
53            can_gc,
54        )
55    }
56}
57
58impl CanvasGradientMethods<crate::DomTypeHolder> for CanvasGradient {
59    // https://html.spec.whatwg.org/multipage/#dom-canvasgradient-addcolorstop
60    fn AddColorStop(&self, offset: Finite<f64>, color: DOMString) -> ErrorResult {
61        if *offset < 0f64 || *offset > 1f64 {
62            return Err(Error::IndexSize);
63        }
64
65        let color = match parse_color(None, &color) {
66            Ok(color) => color,
67            Err(_) => return Err(Error::Syntax),
68        };
69
70        self.stops.borrow_mut().push(CanvasGradientStop {
71            offset: (*offset),
72            color,
73        });
74        Ok(())
75    }
76}
77
78pub(crate) trait ToFillOrStrokeStyle {
79    fn to_fill_or_stroke_style(self) -> FillOrStrokeStyle;
80}
81
82impl ToFillOrStrokeStyle for &CanvasGradient {
83    fn to_fill_or_stroke_style(self) -> FillOrStrokeStyle {
84        let gradient_stops = self.stops.borrow().clone();
85        match self.style {
86            CanvasGradientStyle::Linear(ref gradient) => {
87                FillOrStrokeStyle::LinearGradient(LinearGradientStyle::new(
88                    gradient.x0,
89                    gradient.y0,
90                    gradient.x1,
91                    gradient.y1,
92                    gradient_stops,
93                ))
94            },
95            CanvasGradientStyle::Radial(ref gradient) => {
96                FillOrStrokeStyle::RadialGradient(RadialGradientStyle::new(
97                    gradient.x0,
98                    gradient.y0,
99                    gradient.r0,
100                    gradient.x1,
101                    gradient.y1,
102                    gradient.r1,
103                    gradient_stops,
104                ))
105            },
106        }
107    }
108}
script/dom/canvasgradient.rs

script/dom/
canvasgradient.rs
