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use std::iter::zip;
use niri_config::CornerRadius;
use smithay::utils::{Logical, Point, Rectangle, Size};
use crate::render_helpers::renderer::NiriRenderer;
use crate::render_helpers::shadow::ShadowRenderElement;
#[derive(Debug)]
pub struct Shadow {
shader_rects: Vec<Rectangle<f64, Logical>>,
shaders: Vec<ShadowRenderElement>,
config: niri_config::Shadow,
}
impl Shadow {
pub fn new(config: niri_config::Shadow) -> Self {
Self {
shader_rects: Vec::new(),
shaders: Vec::new(),
config,
}
}
pub fn update_config(&mut self, config: niri_config::Shadow) {
self.config = config;
}
pub fn update_shaders(&mut self) {
for elem in &mut self.shaders {
elem.damage_all();
}
}
pub fn update_render_elements(
&mut self,
win_size: Size<f64, Logical>,
is_active: bool,
radius: CornerRadius,
scale: f64,
alpha: f32,
) {
let ceil = |logical: f64| (logical * scale).ceil() / scale;
// All of this stuff should end up aligned to physical pixels because:
// * Window size is rounded to physical pixels before being passed to this function.
// * We will ceil the corner radii below.
// * We do not divide anything, only add, subtract and multiply by integers.
// * At rendering time, tile positions are rounded to physical pixels.
let width = self.config.softness.0;
// Like in CSS box-shadow.
let sigma = width / 2.;
// Adjust width to draw all necessary pixels.
let width = ceil(sigma * 3.);
let offset = self.config.offset;
let offset = Point::from((ceil(offset.x.0), ceil(offset.y.0)));
let spread = ceil(self.config.spread.0);
let offset = offset - Point::from((spread, spread));
let win_radius = radius.fit_to(win_size.w as f32, win_size.h as f32);
let box_size = win_size + Size::from((spread, spread)).upscale(2.);
let radius = win_radius.expanded_by(spread as f32);
let shader_size = box_size + Size::from((width, width)).upscale(2.);
let color = if is_active {
self.config.color
} else {
// Default to slightly more transparent.
self.config
.inactive_color
.unwrap_or(self.config.color * 0.75)
};
let shader_geo = Rectangle::new(Point::from((-width, -width)), shader_size);
// This is actually offset relative to shader_geo, this is handled below.
let window_geo = Rectangle::new(Point::from((0., 0.)), win_size);
if !self.config.draw_behind_window {
let top_left = ceil(f64::from(win_radius.top_left));
let top_right = f64::min(win_size.w - top_left, ceil(f64::from(win_radius.top_right)));
let bottom_left = f64::min(
win_size.h - top_left,
ceil(f64::from(win_radius.bottom_left)),
);
let bottom_right = f64::min(
win_size.h - top_right,
f64::min(
win_size.w - bottom_left,
ceil(f64::from(win_radius.bottom_right)),
),
);
let top_left = Rectangle::new(Point::from((0., 0.)), Size::from((top_left, top_left)));
let top_right = Rectangle::new(
Point::from((win_size.w - top_right, 0.)),
Size::from((top_right, top_right)),
);
let bottom_right = Rectangle::new(
Point::from((win_size.w - bottom_right, win_size.h - bottom_right)),
Size::from((bottom_right, bottom_right)),
);
let bottom_left = Rectangle::new(
Point::from((0., win_size.h - bottom_left)),
Size::from((bottom_left, bottom_left)),
);
let mut background =
window_geo.subtract_rects([top_left, top_right, bottom_right, bottom_left]);
for rect in &mut background {
rect.loc -= offset;
}
self.shader_rects = shader_geo.subtract_rects(background);
self.shaders
.resize_with(self.shader_rects.len(), Default::default);
for (shader, rect) in zip(&mut self.shaders, &mut self.shader_rects) {
shader.update(
rect.size,
Rectangle::new(rect.loc.upscale(-1.), box_size),
color,
sigma as f32,
radius,
scale as f32,
Rectangle::new(window_geo.loc - offset - rect.loc, window_geo.size),
win_radius,
alpha,
);
rect.loc += offset;
}
} else {
self.shader_rects.resize_with(1, Default::default);
self.shader_rects[0] = shader_geo;
self.shaders.resize_with(1, Default::default);
self.shaders[0].update(
shader_geo.size,
Rectangle::new(shader_geo.loc.upscale(-1.), box_size),
color,
sigma as f32,
radius,
scale as f32,
Rectangle::zero(),
Default::default(),
alpha,
);
self.shader_rects[0].loc += offset;
}
}
pub fn render(
&self,
renderer: &mut impl NiriRenderer,
location: Point<f64, Logical>,
) -> impl Iterator<Item = ShadowRenderElement> + '_ {
if !self.config.on {
return None.into_iter().flatten();
}
let has_shadow_shader = ShadowRenderElement::has_shader(renderer);
if !has_shadow_shader {
return None.into_iter().flatten();
}
let rv = zip(&self.shaders, &self.shader_rects)
.map(move |(shader, rect)| shader.clone().with_location(location + rect.loc));
Some(rv).into_iter().flatten()
}
}
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