win32: set DPI awareness when AppMode is Owner

coupler-rs · Sep 27, 2023 · afb3d69 · afb3d69
1 parent 29ec6d2
commit afb3d69
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Showing 2 changed files with 26 additions and 4 deletions.
diff --git a/src/backend/win32/app.rs b/src/backend/win32/app.rs
@@ -16,7 +16,7 @@ use super::dpi::DpiFns;
 use super::timer::{TimerHandleInner, Timers};
 use super::window::wnd_proc;
 use super::{class_name, hinstance, to_wstring, OsError};
-use crate::{App, AppContext, AppOptions, Error, IntoInnerError, Result};
+use crate::{App, AppContext, AppMode, AppOptions, Error, IntoInnerError, Result};
 
 pub struct AppState {
     pub class: u16,
@@ -39,7 +39,7 @@ pub struct AppInner<T> {
 }
 
 impl<T: 'static> AppInner<T> {
-    pub fn new<F>(_options: &AppOptions, build: F) -> Result<AppInner<T>>
+    pub fn new<F>(options: &AppOptions, build: F) -> Result<AppInner<T>>
     where
         F: FnOnce(&AppContext<T>) -> Result<T>,
         T: 'static,
@@ -71,6 +71,9 @@ impl<T: 'static> AppInner<T> {
         };
 
         let dpi = DpiFns::load();
+        if options.mode == AppMode::Owner {
+            dpi.set_dpi_aware();
+        }
 
         let timers = Timers::new()?;
 

diff --git a/src/backend/win32/dpi.rs b/src/backend/win32/dpi.rs
@@ -1,11 +1,13 @@
 use std::mem;
 
 use windows_sys::core::HRESULT;
-use windows_sys::Win32::Foundation::{BOOL, HWND, RECT};
+use windows_sys::Win32::Foundation::{BOOL, FALSE, HWND, RECT};
 use windows_sys::Win32::Graphics::Gdi::HMONITOR;
 use windows_sys::Win32::System::LibraryLoader::{GetProcAddress, LoadLibraryA};
 use windows_sys::Win32::UI::HiDpi::{
-    DPI_AWARENESS_CONTEXT, MONITOR_DPI_TYPE, PROCESS_DPI_AWARENESS,
+    DPI_AWARENESS_CONTEXT, DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE,
+    DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2, MONITOR_DPI_TYPE, PROCESS_DPI_AWARENESS,
+    PROCESS_PER_MONITOR_DPI_AWARE,
 };
 use windows_sys::Win32::UI::WindowsAndMessaging::{WINDOW_EX_STYLE, WINDOW_STYLE};
 
@@ -70,4 +72,21 @@ impl DpiFns {
             }
         }
     }
+
+    pub fn set_dpi_aware(&self) {
+        #[allow(non_snake_case)]
+        unsafe {
+            if let Some(SetProcessDpiAwarenessContext) = self.SetProcessDpiAwarenessContext {
+                let res = SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
+
+                if res == FALSE {
+                    SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE);
+                }
+            } else if let Some(SetProcessDpiAwareness) = self.SetProcessDpiAwareness {
+                SetProcessDpiAwareness(PROCESS_PER_MONITOR_DPI_AWARE);
+            } else if let Some(SetProcessDPIAware) = self.SetProcessDPIAware {
+                SetProcessDPIAware();
+            }
+        }
+    }
 }