anyrender/
null_backend.rs

1//! A dummy implementation of the AnyRender traits while simply ignores all commands
2
3use crate::{Filter, ImageRenderer, PaintScene, RenderContext, WindowHandle, WindowRenderer};
4use std::sync::Arc;
5
6#[derive(Copy, Clone, Default)]
7pub struct NullWindowRenderer {
8    is_active: bool,
9}
10
11impl NullWindowRenderer {
12    pub fn new() -> Self {
13        Self::default()
14    }
15}
16
17impl RenderContext for NullWindowRenderer {}
18impl WindowRenderer for NullWindowRenderer {
19    type ScenePainter<'a>
20        = NullScenePainter
21    where
22        Self: 'a;
23
24    fn resume<F: FnOnce() + 'static>(
25        &mut self,
26        _window: Arc<dyn WindowHandle>,
27        _width: u32,
28        _height: u32,
29        on_ready: F,
30    ) {
31        self.is_active = true;
32        on_ready();
33    }
34
35    fn complete_resume(&mut self) -> bool {
36        true
37    }
38
39    fn suspend(&mut self) {
40        self.is_active = false
41    }
42
43    fn is_active(&self) -> bool {
44        self.is_active
45    }
46
47    fn set_size(&mut self, _width: u32, _height: u32) {}
48
49    fn render<F: FnOnce(&mut Self::ScenePainter<'_>)>(&mut self, _draw_fn: F) {}
50}
51
52#[derive(Copy, Clone, Default)]
53pub struct NullImageRenderer;
54
55impl NullImageRenderer {
56    pub fn new() -> Self {
57        Self
58    }
59}
60
61impl RenderContext for NullImageRenderer {}
62impl ImageRenderer for NullImageRenderer {
63    type ScenePainter<'a>
64        = NullScenePainter
65    where
66        Self: 'a;
67
68    fn new(_width: u32, _height: u32) -> Self {
69        Self
70    }
71
72    fn resize(&mut self, _width: u32, _height: u32) {}
73
74    fn reset(&mut self) {}
75
76    fn render_to_vec<F: FnOnce(&mut Self::ScenePainter<'_>)>(
77        &mut self,
78        _draw_fn: F,
79        _vec: &mut Vec<u8>,
80    ) {
81    }
82
83    fn render<F: FnOnce(&mut Self::ScenePainter<'_>)>(&mut self, _draw_fn: F, _buffer: &mut [u8]) {}
84}
85
86#[derive(Copy, Clone, Default)]
87pub struct NullScenePainter;
88
89impl NullScenePainter {
90    pub fn new() -> Self {
91        Self
92    }
93}
94
95impl RenderContext for NullScenePainter {}
96impl PaintScene for NullScenePainter {
97    fn reset(&mut self) {}
98
99    fn push_layer(
100        &mut self,
101        _blend: impl Into<peniko::BlendMode>,
102        _alpha: f32,
103        _transform: kurbo::Affine,
104        _clip: &impl kurbo::Shape,
105        _filter: Option<Arc<Filter>>,
106        _backdrop_filter: Option<Arc<Filter>>,
107    ) {
108    }
109
110    fn push_clip_layer(&mut self, _transform: kurbo::Affine, _clip: &impl kurbo::Shape) {}
111
112    fn pop_layer(&mut self) {}
113
114    fn stroke<'a>(
115        &mut self,
116        _style: &kurbo::Stroke,
117        _transform: kurbo::Affine,
118        _brush: impl Into<crate::PaintRef<'a>>,
119        _brush_transform: Option<kurbo::Affine>,
120        _shape: &impl kurbo::Shape,
121    ) {
122    }
123
124    fn fill<'a>(
125        &mut self,
126        _style: peniko::Fill,
127        _transform: kurbo::Affine,
128        _brush: impl Into<crate::PaintRef<'a>>,
129        _brush_transform: Option<kurbo::Affine>,
130        _shape: &impl kurbo::Shape,
131    ) {
132    }
133
134    fn draw_glyphs<'a, 's: 'a>(
135        &'s mut self,
136        _font: &'a peniko::FontData,
137        _font_size: f32,
138        _hint: bool,
139        _normalized_coords: &'a [crate::NormalizedCoord],
140        _embolden: kurbo::Vec2,
141        _style: impl Into<peniko::StyleRef<'a>>,
142        _brush: impl Into<crate::PaintRef<'a>>,
143        _brush_alpha: f32,
144        _transform: kurbo::Affine,
145        _glyph_transform: Option<kurbo::Affine>,
146        _glyphs: impl Iterator<Item = crate::Glyph>,
147    ) {
148    }
149
150    fn draw_box_shadow(
151        &mut self,
152        _transform: kurbo::Affine,
153        _rect: kurbo::Rect,
154        _brush: peniko::Color,
155        _radius: f64,
156        _std_dev: f64,
157    ) {
158    }
159}
anyrender/null_backend.rs

anyrender/
null_backend.rs
