feat(eckhart): implement ScreenBorder overlay

- a static "custom shape" for eckhart layout which displays screen
overlay around the borders

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

@@ -1,3 +1,5 @@
 mod loader;
+mod screen_border;
 
 pub use loader::{render_loader, LoaderRange};
+pub use screen_border::ScreenBorder;

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

@@ -0,0 +1,86 @@
+use crate::ui::{
+    display::Color,
+    geometry::{Alignment2D, Rect},
+    shape::{self, Renderer},
+};
+
+use super::super::{
+    constant,
+    theme::{ICON_BORDER_BL, ICON_BORDER_BR, ICON_BORDER_TL, ICON_BORDER_TR},
+};
+
+/// Custom shape for a full screen border overlay, parameterizable by color.
+pub struct ScreenBorder {
+    color: Color,
+    side_bars: [Rect; 4],
+}
+
+impl ScreenBorder {
+    pub 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 icon.
+        let top_bar_rect = Rect {
+            x0: screen.x0 + ICON_BORDER_TL.toif.width(),
+            y0: screen.y0,
+            x1: screen.x1 - ICON_BORDER_TR.toif.width(),
+            y1: screen.y0 + 2,
+        };
+
+        // Bottom bar: from the right edge of bottom-left icon to the left edge of bottom-right icon.
+        let bottom_bar_rect = Rect {
+            x0: screen.x0 + ICON_BORDER_BL.toif.width(),
+            y0: screen.y1 - 2,
+            x1: screen.x1 - ICON_BORDER_BR.toif.width(),
+            y1: screen.y1,
+        };
+
+        // Left bar: from the bottom edge of top-left icon to the top edge of bottom-left icon.
+        let left_bar_rect = Rect {
+            x0: screen.x0,
+            y0: screen.y0 + ICON_BORDER_TL.toif.height() - 1,
+            x1: screen.x0 + 2,
+            y1: screen.y1 - ICON_BORDER_BL.toif.height(),
+        };
+        // Right bar: from the bottom edge of top-right icon to the top edge of bottom-right icon.
+        let right_bar_rect = Rect {
+            x0: screen.x1 - 2,
+            y0: screen.y0 + ICON_BORDER_TR.toif.height() - 1,
+            x1: screen.x1,
+            y1: screen.y1 - ICON_BORDER_BR.toif.height(),
+        };
+        Self {
+            color,
+            side_bars: [bottom_bar_rect, left_bar_rect, right_bar_rect, top_bar_rect],
+        }
+    }
+
+    pub fn render<'s>(&'s self, target: &mut impl Renderer<'s>) {
+        let screen = constant::screen();
+
+        // Draw the four side bars.
+        for bar in self.side_bars {
+            shape::Bar::new(bar)
+                .with_fg(self.color)
+                .with_thickness(2)
+                .render(target);
+        }
+        // Draw the four corners.
+        shape::ToifImage::new(screen.bottom_left(), ICON_BORDER_BL.toif)
+            .with_fg(self.color)
+            .with_align(Alignment2D::BOTTOM_LEFT)
+            .render(target);
+        shape::ToifImage::new(screen.top_right(), ICON_BORDER_TR.toif)
+            .with_fg(self.color)
+            .with_align(Alignment2D::TOP_RIGHT)
+            .render(target);
+        shape::ToifImage::new(screen.top_left(), ICON_BORDER_TL.toif)
+            .with_fg(self.color)
+            .with_align(Alignment2D::TOP_LEFT)
+            .render(target);
+        shape::ToifImage::new(screen.bottom_right(), ICON_BORDER_BR.toif)
+            .with_fg(self.color)
+            .with_align(Alignment2D::BOTTOM_RIGHT)
+            .render(target);
+    }
+}

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

@@ -86,6 +86,12 @@ include_icon!(ICON_WARNING40, "layout_eckhart/res/warning40.toif");
 include_icon!(ICON_BATTERY_BAR, "layout_eckhart/res/battery_bar.toif");
 include_icon!(ICON_BATTERY_ZAP, "layout_eckhart/res/battery_zap.toif");
 
+// Border overlay icons for bootloader screens and hold to confirm animation
+include_icon!(ICON_BORDER_BL, "layout_eckhart/res/border/BL.toif");
+include_icon!(ICON_BORDER_BR, "layout_eckhart/res/border/BR.toif");
+include_icon!(ICON_BORDER_TL, "layout_eckhart/res/border/TL.toif");
+include_icon!(ICON_BORDER_TR, "layout_eckhart/res/border/TR.toif");
+
 // Text styles
 /// Alias for use with copied code, might be deleted later
 pub const TEXT_NORMAL: TextStyle = TEXT_MEDIUM;