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|
use crate::core::{Color, Rectangle, Size};
use crate::graphics::compositor::{self, Information};
use crate::graphics::damage;
use crate::graphics::{Error, Viewport};
use crate::{Backend, Primitive, Renderer, Settings};
use raw_window_handle::{HasRawDisplayHandle, HasRawWindowHandle};
use std::marker::PhantomData;
pub struct Compositor<Theme> {
_theme: PhantomData<Theme>,
}
pub struct Surface {
window: softbuffer::GraphicsContext,
buffer: Vec<u32>,
clip_mask: tiny_skia::Mask,
primitives: Option<Vec<Primitive>>,
background_color: Color,
}
impl<Theme> crate::graphics::Compositor for Compositor<Theme> {
type Settings = Settings;
type Renderer = Renderer<Theme>;
type Surface = Surface;
fn new<W: HasRawWindowHandle + HasRawDisplayHandle>(
settings: Self::Settings,
_compatible_window: Option<&W>,
) -> Result<(Self, Self::Renderer), Error> {
let (compositor, backend) = new(settings);
Ok((compositor, Renderer::new(backend)))
}
fn create_surface<W: HasRawWindowHandle + HasRawDisplayHandle>(
&mut self,
window: &W,
width: u32,
height: u32,
) -> Surface {
let window =
unsafe { softbuffer::GraphicsContext::new(window, window) }
.expect("Create softbuffer for window");
Surface {
window,
buffer: vec![0; width as usize * height as usize],
clip_mask: tiny_skia::Mask::new(width, height)
.expect("Create clip mask"),
primitives: None,
background_color: Color::BLACK,
}
}
fn configure_surface(
&mut self,
surface: &mut Surface,
width: u32,
height: u32,
) {
surface.buffer.resize((width * height) as usize, 0);
surface.clip_mask =
tiny_skia::Mask::new(width, height).expect("Create clip mask");
surface.primitives = None;
}
fn fetch_information(&self) -> Information {
Information {
adapter: String::from("CPU"),
backend: String::from("tiny-skia"),
}
}
fn present<T: AsRef<str>>(
&mut self,
renderer: &mut Self::Renderer,
surface: &mut Self::Surface,
viewport: &Viewport,
background_color: Color,
overlay: &[T],
) -> Result<(), compositor::SurfaceError> {
renderer.with_primitives(|backend, primitives| {
present(
backend,
surface,
primitives,
viewport,
background_color,
overlay,
)
})
}
fn screenshot<T: AsRef<str>>(
&mut self,
renderer: &mut Self::Renderer,
surface: &mut Self::Surface,
viewport: &Viewport,
background_color: Color,
overlay: &[T],
) -> Vec<u8> {
renderer.with_primitives(|backend, primitives| {
screenshot(
surface,
backend,
primitives,
viewport,
background_color,
overlay,
)
})
}
}
pub fn new<Theme>(settings: Settings) -> (Compositor<Theme>, Backend) {
(
Compositor {
_theme: PhantomData,
},
Backend::new(settings),
)
}
pub fn present<T: AsRef<str>>(
backend: &mut Backend,
surface: &mut Surface,
primitives: &[Primitive],
viewport: &Viewport,
background_color: Color,
overlay: &[T],
) -> Result<(), compositor::SurfaceError> {
let physical_size = viewport.physical_size();
let scale_factor = viewport.scale_factor() as f32;
let mut pixels = tiny_skia::PixmapMut::from_bytes(
bytemuck::cast_slice_mut(&mut surface.buffer),
physical_size.width,
physical_size.height,
)
.expect("Create pixel map");
let damage = surface
.primitives
.as_deref()
.and_then(|last_primitives| {
(surface.background_color == background_color)
.then(|| damage::list(last_primitives, primitives))
})
.unwrap_or_else(|| vec![Rectangle::with_size(viewport.logical_size())]);
if damage.is_empty() {
return Ok(());
}
surface.primitives = Some(primitives.to_vec());
surface.background_color = background_color;
let damage = damage::group(damage, scale_factor, physical_size);
backend.draw(
&mut pixels,
&mut surface.clip_mask,
primitives,
viewport,
&damage,
background_color,
overlay,
);
surface.window.set_buffer(
&surface.buffer,
physical_size.width as u16,
physical_size.height as u16,
);
Ok(())
}
pub fn screenshot<T: AsRef<str>>(
surface: &mut Surface,
backend: &mut Backend,
primitives: &[Primitive],
viewport: &Viewport,
background_color: Color,
overlay: &[T],
) -> Vec<u8> {
let size = viewport.physical_size();
let mut offscreen_buffer: Vec<u32> =
vec![0; size.width as usize * size.height as usize];
backend.draw(
&mut tiny_skia::PixmapMut::from_bytes(
bytemuck::cast_slice_mut(&mut offscreen_buffer),
size.width,
size.height,
)
.expect("Create offscreen pixel map"),
&mut surface.clip_mask,
primitives,
viewport,
&[Rectangle::with_size(Size::new(
size.width as f32,
size.height as f32,
))],
background_color,
overlay,
);
offscreen_buffer.iter().fold(
Vec::with_capacity(offscreen_buffer.len() * 4),
|mut acc, pixel| {
const A_MASK: u32 = 0xFF_00_00_00;
const R_MASK: u32 = 0x00_FF_00_00;
const G_MASK: u32 = 0x00_00_FF_00;
const B_MASK: u32 = 0x00_00_00_FF;
let a = ((A_MASK & pixel) >> 24) as u8;
let r = ((R_MASK & pixel) >> 16) as u8;
let g = ((G_MASK & pixel) >> 8) as u8;
let b = (B_MASK & pixel) as u8;
acc.extend([r, g, b, a]);
acc
},
)
}
|
