feat(eckhart): implement bootloader loader

core/embed/rust/src/ui/layout_eckhart/cshape/loader.rs

@@ -1,40 +1,96 @@
-use crate::ui::{display::Color, geometry::Point, shape, shape::Renderer};
+use crate::ui::{
+    constant::SCREEN,
+    geometry::{Offset, Rect},
+    lerp::Lerp,
+    shape::{self, Renderer},
+};
 
-use super::super::constant;
-
-pub enum LoaderRange {
-    Full,
-    FromTo(f32, f32),
-}
+use super::{super::theme::BG, ScreenBorder};
 
 pub fn render_loader<'s>(
-    center: Point,
-    inactive_color: Color,
-    active_color: Color,
-    background_color: Color,
-    range: LoaderRange,
+    progress: u16,
+    border: &'static ScreenBorder,
     target: &mut impl Renderer<'s>,
 ) {
-    shape::Circle::new(center, constant::LOADER_OUTER)
-        .with_bg(inactive_color)
-        .render(target);
+    // convert to ration from 0.0 to 1.0
+    let progress_ratio = (progress as f32 / 1000.0).clamp(0.0, 1.0);
+    let (clip, top_gap) = get_clips(progress_ratio);
+    render_clipped_border(border, clip, top_gap, u8::MAX, target);
+}
 
-    match range {
-        LoaderRange::Full => {
-            shape::Circle::new(center, constant::LOADER_OUTER)
-                .with_bg(active_color)
-                .render(target);
+fn get_clips(progress_ratio: f32) -> (Rect, Rect) {
+    /// Ratio of total_duration for the bottom part of the border
+    const BOTTOM_DURATION_RATIO: f32 = 0.125;
+    /// Ratio of total_duration for the side parts of the border
+    const SIDES_DURATION_RATIO: f32 = 0.5;
+    /// Ratio of total_duration for the top part of the border
+    const TOP_DURATION_RATIO: f32 = 0.375;
+
+    const TOP_GAP_ZERO: Rect = Rect::from_center_and_size(
+        SCREEN.top_center().ofs(Offset::y(ScreenBorder::WIDTH / 2)),
+        Offset::zero(),
+    );
+    const TOP_GAP_FULL: Rect = Rect::from_center_and_size(
+        SCREEN.top_center().ofs(Offset::y(ScreenBorder::WIDTH / 2)),
+        Offset::new(SCREEN.width(), ScreenBorder::WIDTH),
+    );
+
+    match progress_ratio {
+        // Bottom phase growing linearly
+        p if p < BOTTOM_DURATION_RATIO => {
+            let bottom_progress = (p / BOTTOM_DURATION_RATIO).clamp(0.0, 1.0);
+            let width = i16::lerp(0, SCREEN.width(), bottom_progress);
+            let clip = Rect::from_center_and_size(
+                SCREEN
+                    .bottom_center()
+                    .ofs(Offset::y(-ScreenBorder::WIDTH / 2)),
+                Offset::new(width, ScreenBorder::WIDTH),
+            );
+            (clip, TOP_GAP_FULL)
         }
-        LoaderRange::FromTo(start, end) => {
-            shape::Circle::new(center, constant::LOADER_OUTER)
-                .with_bg(active_color)
-                .with_start_angle(start)
-                .with_end_angle(end)
-                .render(target);
+
+        // Sides phase growing up linearly
+        p if p < (BOTTOM_DURATION_RATIO + SIDES_DURATION_RATIO) => {
+            let sides_progress =
+                ((p - BOTTOM_DURATION_RATIO) / SIDES_DURATION_RATIO).clamp(0.0, 1.0);
+            let height = i16::lerp(ScreenBorder::WIDTH, SCREEN.height(), sides_progress);
+            let clip = Rect::from_bottom_left_and_size(
+                SCREEN.bottom_left(),
+                Offset::new(SCREEN.width(), height),
+            );
+            (clip, TOP_GAP_FULL)
         }
+
+        // Top gap shrinking linearly
+        p if p < 1.0 => {
+            let top_progress = ((p - BOTTOM_DURATION_RATIO - SIDES_DURATION_RATIO)
+                / TOP_DURATION_RATIO)
+                .clamp(0.0, 1.0);
+            let width = i16::lerp(SCREEN.width(), 0, top_progress);
+            let top_gap = Rect::from_center_and_size(
+                SCREEN.top_center().ofs(Offset::y(ScreenBorder::WIDTH / 2)),
+                Offset::new(width, ScreenBorder::WIDTH),
+            );
+            (SCREEN, top_gap)
+        }
+
+        // Animation complete
+        _ => (SCREEN, TOP_GAP_ZERO),
     }
+}
 
-    shape::Circle::new(center, constant::LOADER_INNER + 2)
-        .with_bg(background_color)
+fn render_clipped_border<'s>(
+    border: &'static ScreenBorder,
+    clip: Rect,
+    top_gap: Rect,
+    alpha: u8,
+    target: &mut impl Renderer<'s>,
+) {
+    target.in_clip(clip, &|target| {
+        border.render(alpha, target);
+    });
+    shape::Bar::new(top_gap)
+        .with_bg(BG)
+        .with_fg(BG)
         .render(target);
 }

core/embed/rust/src/ui/layout_eckhart/cshape/mod.rs

@@ -1,5 +1,5 @@
 mod loader;
 mod screen_border;
 
-pub use loader::{render_loader, LoaderRange};
+pub use loader::render_loader;
 pub use screen_border::ScreenBorder;

core/embed/rust/src/ui/layout_eckhart/cshape/screen_border.rs

@@ -17,7 +17,7 @@ pub struct ScreenBorder {
 
 impl ScreenBorder {
     pub const WIDTH: i16 = 4;
-    pub fn new(color: Color) -> Self {
+    pub const fn new(color: Color) -> Self {
         let screen = constant::screen();
 
         // Top bar: from the right edge of top-left icon to the left edge of top-right