Make Servo DPI aware on Windows

This implements system level DPI awareness for Windows. It has three parts: 1. Add a application manifest which is copied alongside servo.exe during build that declares our DPI awareness level. This is needed otherwise DPI queries will return 96dpi and our application will be upscaled on high DPI displays. 2. Rename hidpi_factor to avoid confusion with Glutin's hidpi_factor which does something else. 3. Correctly convert windows sizes on window creation for Windows. Unlike OS X, Windows uses device pixels for window creation.
servo · May 21, 2016 · 08f8763 · 08f8763
1 parent b9650b5
commit 08f8763
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Showing 12 changed files with 146 additions and 75 deletions.
diff --git a/components/compositing/compositor.rs b/components/compositing/compositor.rs
@@ -144,7 +144,7 @@ pub struct IOCompositor<Window: WindowMethods> {
     page_zoom: ScaleFactor<ViewportPx, ScreenPx, f32>,
 
     /// The device pixel ratio for this window.
-    hidpi_factor: ScaleFactor<ScreenPx, DevicePixel, f32>,
+    scale_factor: ScaleFactor<ScreenPx, DevicePixel, f32>,
 
     channel_to_self: Box<CompositorProxy + Send>,
 
@@ -405,7 +405,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
             mem::ProfilerMsg::RegisterReporter(reporter_name(), reporter));
 
         let window_size = window.framebuffer_size();
-        let hidpi_factor = window.hidpi_factor();
+        let scale_factor = window.scale_factor();
         let composite_target = match opts::get().output_file {
             Some(_) => CompositeTarget::PngFile,
             None => CompositeTarget::Window
@@ -434,7 +434,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
             }),
             window_size: window_size,
             viewport: None,
-            hidpi_factor: hidpi_factor,
+            scale_factor: scale_factor,
             channel_to_self: state.sender.clone_compositor_proxy(),
             delayed_composition_timer: DelayedCompositionTimerProxy::new(state.sender),
             composition_request: CompositionRequest::NoCompositingNecessary,
@@ -1315,9 +1315,9 @@ impl<Window: WindowMethods> IOCompositor<Window> {
         debug!("compositor resizing to {:?}", new_size.to_untyped());
 
         // A size change could also mean a resolution change.
-        let new_hidpi_factor = self.window.hidpi_factor();
-        if self.hidpi_factor != new_hidpi_factor {
-            self.hidpi_factor = new_hidpi_factor;
+        let new_scale_factor = self.window.scale_factor();
+        if self.scale_factor != new_scale_factor {
+            self.scale_factor = new_scale_factor;
             self.update_zoom_transform();
         }
 
@@ -1744,7 +1744,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
             Some(device_pixels_per_px) => ScaleFactor::new(device_pixels_per_px),
             None => match opts::get().output_file {
                 Some(_) => ScaleFactor::new(1.0),
-                None => self.hidpi_factor
+                None => self.scale_factor
             }
         }
     }

diff --git a/components/compositing/windowing.rs b/components/compositing/windowing.rs
@@ -133,8 +133,8 @@ pub trait WindowMethods {
     /// Called when the <head> tag has finished parsing
     fn head_parsed(&self);
 
-    /// Returns the hidpi factor of the monitor.
-    fn hidpi_factor(&self) -> ScaleFactor<ScreenPx, DevicePixel, f32>;
+    /// Returns the scale factor of the system (device pixels / screen pixels).
+    fn scale_factor(&self) -> ScaleFactor<ScreenPx, DevicePixel, f32>;
 
     /// Gets the OS native graphics display for this window.
     fn native_display(&self) -> NativeDisplay;

diff --git a/components/servo/Cargo.lock b/components/servo/Cargo.lock
diff --git a/components/servo/lib.rs b/components/servo/lib.rs
@@ -129,12 +129,12 @@ impl Browser {
             resource_path.push("shaders");
 
             // TODO(gw): Duplicates device_pixels_per_screen_px from compositor. Tidy up!
-            let hidpi_factor = window.hidpi_factor().get();
+            let scale_factor = window.scale_factor().get();
             let device_pixel_ratio = match opts.device_pixels_per_px {
                 Some(device_pixels_per_px) => device_pixels_per_px,
                 None => match opts.output_file {
                     Some(_) => 1.0,
-                    None => hidpi_factor,
+                    None => scale_factor,
                 }
             };
 

diff --git a/components/servo/servo.exe.manifest b/components/servo/servo.exe.manifest
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1"
+          manifestVersion="1.0"
+          xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
+  <assemblyIdentity type="win32"
+                    name="servo.Servo"
+                    version="0.1.0.0"/>
+
+  <compatibility>
+    <application>
+      <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/> <!-- Windows 7 -->
+      <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/> <!-- Windows 8 -->
+      <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/> <!-- Windows 8.1 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/> <!-- Windows 10 -->
+    </application>
+  </compatibility>
+
+  <asmv3:application>
+    <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
+      <dpiAware>true</dpiAware> 
+    </asmv3:windowsSettings>
+  </asmv3:application>
+</assembly>
+