panel: Use scaling to set height

src/animation.rs

@@ -6,6 +6,7 @@
 
 use std::time::Duration;
 
+use crate::main::PixelSize;
 use crate::outputs::OutputId;
 
 /// The keyboard should hide after this has elapsed to prevent flickering.
@@ -16,7 +17,7 @@ pub const HIDING_TIMEOUT: Duration = Duration::from_millis(200);
 pub enum Outcome {
     Visible {
         output: OutputId,
-        height: u32,
+        height: PixelSize,
     },
     Hidden,
 }

src/main.rs

@@ -75,7 +75,7 @@ mod c {
     extern "C" {
         #[allow(improper_ctypes)]
         fn init_wayland(wayland: *mut Wayland);
-        fn server_context_service_update_keyboard(service: *const UIManager, output: WlOutput, height: u32);
+        fn server_context_service_update_keyboard(service: *const UIManager, output: WlOutput, scaled_height: u32);
         fn server_context_service_real_hide_keyboard(service: *const UIManager);
         fn server_context_service_set_hint_purpose(service: *const UIManager, hint: u32, purpose: u32);
         // This should probably only get called from the gtk main loop,
@@ -151,7 +151,7 @@ mod c {
     ) {
         match msg.panel_visibility {
             Some(PanelCommand::Show { output, height }) => unsafe {
-                server_context_service_update_keyboard(ui_manager, output.0, height);
+                server_context_service_update_keyboard(ui_manager, output.0, height.as_scaled_ceiling());
             },
             Some(PanelCommand::Hide) => unsafe {
                 server_context_service_real_hide_keyboard(ui_manager);
@@ -177,11 +177,33 @@ mod c {
     }
 }
 
+/// Size in pixels that is aware of scaling
+#[derive(Clone, Copy, PartialEq, Debug)]
+pub struct PixelSize {
+    pub pixels: u32,
+    pub scale_factor: u32,
+}
+
+fn div_ceil(a: u32, b: u32) -> u32 {
+    // Given that it's for pixels on a screen, an overflow is unlikely.
+    (a + b - 1) / b
+}
+
+impl PixelSize {
+    pub fn as_scaled_floor(&self) -> u32 {
+        self.pixels / self.scale_factor
+    }
+
+    pub fn as_scaled_ceiling(&self) -> u32 {
+        div_ceil(self.pixels, self.scale_factor)
+    }
+}
+
 #[derive(Clone, PartialEq, Debug)]
 pub enum PanelCommand {
     Show {
         output: OutputId,
-        height: u32,
+        height: PixelSize,
     },
     Hide,
 }

src/server-context-service.c

@@ -139,9 +139,10 @@ server_context_service_real_hide_keyboard (ServerContextService *self)
 }
 
 // Called from rust
-/// Updates the type of visibility
+/// Updates the type of visibility.
+/// Height is in scaled units.
 void
-server_context_service_update_keyboard (ServerContextService *self, struct wl_output *output, uint32_t height)
+server_context_service_update_keyboard (ServerContextService *self, struct wl_output *output, uint32_t scaled_height)
 {
     if (output != self->current_output) {
         // Recreate on a new output
@@ -153,11 +154,11 @@ server_context_service_update_keyboard (ServerContextService *self, struct wl_ou
                      "configured-height", &h,
                      NULL);
 
-        if ((uint32_t)h != height) {
+        if ((uint32_t)h != scaled_height) {
 
             //TODO: make sure that redrawing happens in the correct place (it doesn't now).
-            phosh_layer_surface_set_size(self->window, 0, height);
+            phosh_layer_surface_set_size(self->window, 0, scaled_height);
-            phosh_layer_surface_set_exclusive_zone(self->window, height);
+            phosh_layer_surface_set_exclusive_zone(self->window, scaled_height);
             phosh_layer_surface_wl_surface_commit(self->window);
 
             self->current_output = output;
@@ -169,7 +170,7 @@ server_context_service_update_keyboard (ServerContextService *self, struct wl_ou
     self->current_output = output;
 
     if (!self->window) {
-        make_window (self, output, height);
+        make_window (self, output, scaled_height);
     }
     if (!self->widget) {
         make_widget (self);

src/state.rs

@@ -7,7 +7,7 @@
 
 use crate::animation;
 use crate::imservice::{ ContentHint, ContentPurpose };
-use crate::main::{ Commands, PanelCommand };
+use crate::main::{ Commands, PanelCommand, PixelSize };
 use crate::outputs;
 use crate::outputs::{OutputId, OutputState};
 use std::cmp;
@@ -238,7 +238,7 @@ impl Application {
         }
     }
 
-    fn get_preferred_height(output: &OutputState) -> Option<u32> {
+    fn get_preferred_height(output: &OutputState) -> Option<PixelSize> {
         output.get_pixel_size()
             .map(|px_size| {
                 let height = {
@@ -253,7 +253,10 @@ impl Application {
                         }
                     }
                 };
-                cmp::min(height, px_size.height / 2)
+                PixelSize {
+                    scale_factor: output.scale as u32,
+                    pixels: cmp::min(height, px_size.height / 2),
+                }
             })
     }
 
@@ -265,7 +268,7 @@ impl Application {
                 Some(output) => {
                     // Hoping that this will get optimized out on branches not using `visible`.
                     let height = Self::get_preferred_height(self.outputs.get(&output).unwrap())
-                        .unwrap_or(0);
+                        .unwrap_or(PixelSize{pixels: 0, scale_factor: 1});
                     // TODO: Instead of setting size to 0 when the output is invalid,
                     // simply go invisible.
                     let visible = animation::Outcome::Visible{ output, height };