screenshot-ui: Animate opening

niri-config/src/lib.rs

@@ -571,6 +571,8 @@ pub struct Animations {
     pub window_resize: WindowResizeAnim,
     #[knuffel(child, default)]
     pub config_notification_open_close: ConfigNotificationOpenCloseAnim,
+    #[knuffel(child, default)]
+    pub screenshot_ui_open: ScreenshotUiOpenAnim,
 }
 
 impl Default for Animations {
@@ -585,6 +587,7 @@ impl Default for Animations {
             window_close: Default::default(),
             window_resize: Default::default(),
             config_notification_open_close: Default::default(),
+            screenshot_ui_open: Default::default(),
         }
     }
 }
@@ -717,6 +720,21 @@ impl Default for ConfigNotificationOpenCloseAnim {
     }
 }
 
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct ScreenshotUiOpenAnim(pub Animation);
+
+impl Default for ScreenshotUiOpenAnim {
+    fn default() -> Self {
+        Self(Animation {
+            off: false,
+            kind: AnimationKind::Easing(EasingParams {
+                duration_ms: 200,
+                curve: AnimationCurve::EaseOutQuad,
+            }),
+        })
+    }
+}
+
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub struct Animation {
     pub off: bool,
@@ -1802,6 +1820,21 @@ where
     }
 }
 
+impl<S> knuffel::Decode<S> for ScreenshotUiOpenAnim
+where
+    S: knuffel::traits::ErrorSpan,
+{
+    fn decode_node(
+        node: &knuffel::ast::SpannedNode<S>,
+        ctx: &mut knuffel::decode::Context<S>,
+    ) -> Result<Self, DecodeError<S>> {
+        let default = Self::default().0;
+        Ok(Self(Animation::decode_node(node, ctx, default, |_, _| {
+            Ok(false)
+        })?))
+    }
+}
+
 impl Animation {
     pub fn new_off() -> Self {
         Self {

src/input/mod.rs

@@ -2569,7 +2569,7 @@ mod tests {
         let comp_mod = CompositorMod::Super;
         let mut suppressed_keys = HashSet::new();
 
-        let screenshot_ui = ScreenshotUi::new();
+        let screenshot_ui = ScreenshotUi::new(Default::default());
         let disable_power_key_handling = false;
 
         // The key_code we pick is arbitrary, the only thing

src/niri.rs

@@ -1589,7 +1589,7 @@ impl Niri {
         let mods_with_finger_scroll_binds =
             mods_with_finger_scroll_binds(backend.mod_key(), &config_.binds);
 
-        let screenshot_ui = ScreenshotUi::new();
+        let screenshot_ui = ScreenshotUi::new(config.clone());
         let config_error_notification = ConfigErrorNotification::new(config.clone());
 
         let mut hotkey_overlay = HotkeyOverlay::new(config.clone(), backend.mod_key());
@@ -2973,6 +2973,10 @@ impl Niri {
             state.unfinished_animations_remain |=
                 self.config_error_notification.are_animations_ongoing();
 
+            self.screenshot_ui
+                .advance_animations(target_presentation_time);
+            state.unfinished_animations_remain |= self.screenshot_ui.are_animations_ongoing();
+
             // Also keep redrawing if the current cursor is animated.
             state.unfinished_animations_remain |= self
                 .cursor_manager

src/ui/screenshot_ui.rs

@@ -1,11 +1,13 @@
+use std::cell::RefCell;
 use std::cmp::{max, min};
 use std::collections::HashMap;
 use std::iter::zip;
-use std::mem;
+use std::rc::Rc;
+use std::time::Duration;
 
 use anyhow::Context;
 use arrayvec::ArrayVec;
-use niri_config::Action;
+use niri_config::{Action, Config};
 use pango::{Alignment, FontDescription};
 use pangocairo::cairo::{self, ImageSurface};
 use smithay::backend::allocator::Fourcc;
@@ -18,6 +20,7 @@ use smithay::input::keyboard::{Keysym, ModifiersState};
 use smithay::output::{Output, WeakOutput};
 use smithay::utils::{Physical, Point, Rectangle, Scale, Size, Transform};
 
+use crate::animation::Animation;
 use crate::niri_render_elements;
 use crate::render_helpers::primary_gpu_texture::PrimaryGpuTextureRenderElement;
 use crate::render_helpers::solid_color::{SolidColorBuffer, SolidColorRenderElement};
@@ -42,15 +45,19 @@ const TEXT_SHOW_P: &str =
 // allows only single-output selections for now.
 //
 // As a consequence of this, selection coordinates are in output-local coordinate space.
+#[allow(clippy::large_enum_variant)]
 pub enum ScreenshotUi {
     Closed {
         last_selection: Option<(WeakOutput, Rectangle<i32, Physical>)>,
+        config: Rc<RefCell<Config>>,
     },
     Open {
         selection: (Output, Point<i32, Physical>, Point<i32, Physical>),
         output_data: HashMap<Output, OutputData>,
         mouse_down: bool,
         show_pointer: bool,
+        open_anim: Animation,
+        config: Rc<RefCell<Config>>,
     },
 }
 
@@ -79,9 +86,10 @@ niri_render_elements! {
 }
 
 impl ScreenshotUi {
-    pub fn new() -> Self {
+    pub fn new(config: Rc<RefCell<Config>>) -> Self {
         Self::Closed {
             last_selection: None,
+            config,
         }
     }
 
@@ -96,7 +104,11 @@ impl ScreenshotUi {
             return false;
         }
 
-        let Self::Closed { last_selection } = self else {
+        let Self::Closed {
+            last_selection,
+            config,
+        } = self
+        else {
             return false;
         };
 
@@ -167,11 +179,18 @@ impl ScreenshotUi {
             })
             .collect();
 
+        let open_anim = {
+            let c = config.borrow();
+            Animation::new(0., 1., 0., c.animations.screenshot_ui_open.0)
+        };
+
         *self = Self::Open {
             selection,
             output_data,
             mouse_down: false,
             show_pointer: true,
+            open_anim,
+            config: config.clone(),
         };
 
         self.update_buffers();
@@ -180,13 +199,11 @@ impl ScreenshotUi {
     }
 
     pub fn close(&mut self) -> bool {
-        let selection = match mem::take(self) {
-            Self::Open { selection, .. } => selection,
-            closed @ Self::Closed { .. } => {
-                // Put it back.
-                *self = closed;
-                return false;
-            }
+        let Self::Open {
+            selection, config, ..
+        } = self
+        else {
+            return false;
         };
 
         let last_selection = Some((
@@ -194,7 +211,10 @@ impl ScreenshotUi {
             rect_from_corner_points(selection.1, selection.2),
         ));
 
-        *self = Self::Closed { last_selection };
+        *self = Self::Closed {
+            last_selection,
+            config: config.clone(),
+        };
 
         true
     }
@@ -209,6 +229,22 @@ impl ScreenshotUi {
         matches!(self, ScreenshotUi::Open { .. })
     }
 
+    pub fn advance_animations(&mut self, current_time: Duration) {
+        let Self::Open { open_anim, .. } = self else {
+            return;
+        };
+
+        open_anim.set_current_time(current_time);
+    }
+
+    pub fn are_animations_ongoing(&self) -> bool {
+        let Self::Open { open_anim, .. } = self else {
+            return false;
+        };
+
+        !open_anim.is_done()
+    }
+
     fn update_buffers(&mut self) {
         let Self::Open {
             selection,
@@ -293,6 +329,7 @@ impl ScreenshotUi {
             output_data,
             show_pointer,
             mouse_down,
+            open_anim,
             ..
         } = self
         else {
@@ -306,6 +343,7 @@ impl ScreenshotUi {
         };
 
         let scale = output_data.scale;
+        let progress = open_anim.clamped_value().clamp(0., 1.) as f32;
 
         // The help panel goes on top.
         if let Some((show, hide)) = &output_data.panel {
@@ -324,7 +362,7 @@ impl ScreenshotUi {
             let elem = PrimaryGpuTextureRenderElement(TextureRenderElement::from_texture_buffer(
                 buffer.clone(),
                 location,
-                alpha,
+                alpha * progress,
                 None,
                 None,
                 Kind::Unspecified,
@@ -337,7 +375,7 @@ impl ScreenshotUi {
             SolidColorRenderElement::from_buffer(
                 buffer,
                 loc.to_f64().to_logical(scale),
-                1.,
+                progress,
                 Kind::Unspecified,
             )
             .into()
@@ -530,12 +568,6 @@ impl ScreenshotUi {
     }
 }
 
-impl Default for ScreenshotUi {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
 impl OutputScreenshot {
     pub fn from_textures(
         renderer: &mut GlesRenderer,

wiki/Configuration:-Animations.md

@@ -45,6 +45,11 @@ animations {
     config-notification-open-close {
         spring damping-ratio=0.6 stiffness=1000 epsilon=0.001
     }
+
+    screenshot-ui-open {
+        duration-ms 200
+        curve "ease-out-quad"
+    }
 }
 ```
 
@@ -354,6 +359,21 @@ animations {
 }
 ```
 
+#### `screenshot-ui-open`
+
+<sup>Since: 0.1.8</sup>
+
+The open (fade-in) animation of the screenshot UI.
+
+```
+animations {
+    screenshot-ui-open {
+        duration-ms 200
+        curve "ease-out-quad"
+    }
+}
+```
+
 ### Synchronized Animations
 
 <sup>Since: 0.1.5</sup>