Implement gradient borders

1 files changed, 79 insertions, 22 deletions

diff --git a/src/layout/focus_ring.rs b/src/layout/focus_ring.rs
index 0addd204..24013510 100644
--- a/src/layout/focus_ring.rs
+++ b/src/layout/focus_ring.rs
@@ -1,26 +1,41 @@
 use std::iter::zip;
 
 use arrayvec::ArrayVec;
-use niri_config;
+use niri_config::{self, GradientRelativeTo};
 use smithay::backend::renderer::element::solid::{SolidColorBuffer, SolidColorRenderElement};
 use smithay::backend::renderer::element::Kind;
-use smithay::utils::{Logical, Point, Scale, Size};
+use smithay::utils::{Logical, Point, Rectangle, Scale, Size};
+
+use crate::niri_render_elements;
+use crate::render_helpers::gradient::GradientRenderElement;
+use crate::render_helpers::renderer::NiriRenderer;
 
 #[derive(Debug)]
 pub struct FocusRing {
     buffers: [SolidColorBuffer; 4],
     locations: [Point<i32, Logical>; 4],
+    sizes: [Size<i32, Logical>; 4],
+    full_size: Size<i32, Logical>,
+    is_active: bool,
     is_border: bool,
     config: niri_config::FocusRing,
 }
 
-pub type FocusRingRenderElement = SolidColorRenderElement;
+niri_render_elements! {
+    FocusRingRenderElement => {
+        SolidColor = SolidColorRenderElement,
+        Gradient = GradientRenderElement,
+    }
+}
 
 impl FocusRing {
     pub fn new(config: niri_config::FocusRing) -> Self {
         Self {
             buffers: Default::default(),
             locations: Default::default(),
+            sizes: Default::default(),
+            full_size: Default::default(),
+            is_active: false,
             is_border: false,
             config,
         }
@@ -32,20 +47,25 @@ impl FocusRing {
 
     pub fn update(&mut self, win_size: Size<i32, Logical>, is_border: bool) {
         let width = i32::from(self.config.width);
+        self.full_size = win_size + Size::from((width * 2, width * 2));
 
         if is_border {
-            self.buffers[0].resize((win_size.w + width * 2, width));
-            self.buffers[1].resize((win_size.w + width * 2, width));
-            self.buffers[2].resize((width, win_size.h));
-            self.buffers[3].resize((width, win_size.h));
+            self.sizes[0] = Size::from((win_size.w + width * 2, width));
+            self.sizes[1] = Size::from((win_size.w + width * 2, width));
+            self.sizes[2] = Size::from((width, win_size.h));
+            self.sizes[3] = Size::from((width, win_size.h));
+
+            for (buf, size) in zip(&mut self.buffers, self.sizes) {
+                buf.resize(size);
+            }
 
             self.locations[0] = Point::from((-width, -width));
             self.locations[1] = Point::from((-width, win_size.h));
             self.locations[2] = Point::from((-width, 0));
             self.locations[3] = Point::from((win_size.w, 0));
         } else {
-            let size = win_size + Size::from((width * 2, width * 2));
-            self.buffers[0].resize(size);
+            self.sizes[0] = self.full_size;
+            self.buffers[0].resize(self.sizes[0]);
             self.locations[0] = Point::from((-width, -width));
         }
 
@@ -62,12 +82,16 @@ impl FocusRing {
         for buf in &mut self.buffers {
             buf.set_color(color);
         }
+
+        self.is_active = is_active;
     }
 
-    pub fn render(
+    pub fn render<R: NiriRenderer>(
         &self,
+        renderer: &mut R,
         location: Point<i32, Logical>,
         scale: Scale<f64>,
+        view_size: Size<i32, Logical>,
     ) -> impl Iterator<Item = FocusRingRenderElement> {
         let mut rv = ArrayVec::<_, 4>::new();
 
@@ -75,23 +99,56 @@ impl FocusRing {
             return rv.into_iter();
         }
 
-        let mut push = |buffer, location: Point<i32, Logical>| {
-            let elem = SolidColorRenderElement::from_buffer(
-                buffer,
-                location.to_physical_precise_round(scale),
-                scale,
-                1.,
-                Kind::Unspecified,
-            );
-            rv.push(elem.into());
+        let gradient = if self.is_active {
+            self.config.active_gradient
+        } else {
+            self.config.inactive_gradient
+        };
+
+        let full_rect = Rectangle::from_loc_and_size(location + self.locations[0], self.full_size);
+        let view_rect = Rectangle::from_loc_and_size((0, 0), view_size);
+
+        let mut push = |buffer, location: Point<i32, Logical>, size: Size<i32, Logical>| {
+            let elem = gradient.and_then(|gradient| {
+                let gradient_area = match gradient.relative_to {
+                    GradientRelativeTo::Window => full_rect,
+                    GradientRelativeTo::WorkspaceView => view_rect,
+                };
+                GradientRenderElement::new(
+                    renderer,
+                    scale,
+                    Rectangle::from_loc_and_size(location, size),
+                    gradient_area,
+                    gradient.from.into(),
+                    gradient.to.into(),
+                    ((gradient.angle as f32) - 90.).to_radians(),
+                )
+                .map(Into::into)
+            });
+
+            let elem = elem.unwrap_or_else(|| {
+                SolidColorRenderElement::from_buffer(
+                    buffer,
+                    location.to_physical_precise_round(scale),
+                    scale,
+                    1.,
+                    Kind::Unspecified,
+                )
+                .into()
+            });
+            rv.push(elem);
         };
 
         if self.is_border {
-            for (buf, loc) in zip(&self.buffers, self.locations) {
-                push(buf, location + loc);
+            for (buf, (loc, size)) in zip(&self.buffers, zip(self.locations, self.sizes)) {
+                push(buf, location + loc, size);
             }
         } else {
-            push(&self.buffers[0], location + self.locations[0]);
+            push(
+                &self.buffers[0],
+                location + self.locations[0],
+                self.sizes[0],
+            );
         }
 
         rv.into_iter()