devotee_backend/
middling.rs

1/// So-so display surface trait for reuse purposes.
2pub trait Surface {
3    /// Specific texel type.
4    type Texel;
5
6    /// Get texel given its coordinates.
7    fn texel(&self, x: u32, y: u32) -> Option<Self::Texel>;
8
9    /// Set texel given its coordinates.
10    fn set_texel(&mut self, x: u32, y: u32, value: Self::Texel);
11
12    /// Get texel given its coordinates unsafely.
13    ///
14    /// # Safety
15    ///
16    /// - `x` must be in range [`0`, `width - 1`];
17    /// - `y` must be in range [`0`, `height - 1`];
18    unsafe fn texel_unchecked(&self, x: u32, y: u32) -> Self::Texel {
19        self.texel(x, y).unwrap()
20    }
21
22    /// Set texel value given its coordinates unsafely.
23    ///
24    /// # Safety
25    ///
26    /// - `x` must be in range [`0`, `width - 1`];
27    /// - `y` must be in range [`0`, `height - 1`];
28    unsafe fn set_texel_unchecked(&mut self, x: u32, y: u32, value: Self::Texel) {
29        self.set_texel(x, y, value)
30    }
31
32    /// Clear the surface with the given color.
33    fn clear(&mut self, value: Self::Texel);
34
35    /// Get surface width.
36    fn width(&self) -> u32;
37
38    /// Get surface height.
39    fn height(&self) -> u32;
40}
41
42/// The surface that can be filled directly.
43pub trait Fill<I>: Surface {
44    /// Fill the surface from the provided `data`.
45    fn fill_from(&mut self, data: I);
46}
47
48/// Input handler trait with optional input caching.
49pub trait InputHandler<Event, EventContext> {
50    /// Handle input event, optionally consume it.
51    fn handle_event(&mut self, event: Event, event_context: &EventContext) -> Option<Event>;
52
53    /// Update internal state over tick event.
54    fn update(&mut self);
55}
56
57/// Event context generalization.
58pub trait EventContext<EventSpace> {
59    /// Surface space coordinates representation.
60    type SurfaceSpace;
61
62    /// Recalculate from the event space coordinates into the surface space coordinates.
63    fn estimate_surface_space(&self, event_space: EventSpace) -> Self::SurfaceSpace;
64}
devotee_backend/middling.rs

devotee_backend/
middling.rs
