From 9787e25bc5371dd55689f4840d46ceb9ae7e7b2c Mon Sep 17 00:00:00 2001
From: lgou2w <lgou2w@hotmail.com>
Date: Wed, 17 Jul 2024 19:46:28 +0800
Subject: [PATCH] fix(#40): unable to resize window at high dpi

---
 Cargo.lock                |  1 +
 src-tauri/Cargo.toml      |  6 +++++
 src-tauri/src/main.rs     | 49 +++++++++++++++++++++++++++++++++++----
 src-tauri/tauri.conf.json |  4 +---
 4 files changed, 53 insertions(+), 7 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 287ac00f..b7baa3a8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1585,6 +1585,7 @@ dependencies = [
  "tracing",
  "tracing-subscriber",
  "url",
+ "windows 0.39.0",
 ]
 
 [[package]]
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index 1858c081..3ddd575a 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -39,6 +39,12 @@ tracing = "0.1.40"
 tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
 url = "2.5.2"
 
+[target."cfg(windows)".dependencies.windows]
+version = "0.39.0"
+features = [
+  "Win32_UI_WindowsAndMessaging"
+]
+
 [features]
 default = ["custom-protocol"]
 custom-protocol = ["tauri/custom-protocol"]
diff --git a/src-tauri/src/main.rs b/src-tauri/src/main.rs
index 270399d3..077f2e46 100644
--- a/src-tauri/src/main.rs
+++ b/src-tauri/src/main.rs
@@ -20,10 +20,14 @@ fn main() {
     .plugin(storage::StoragePluginBuilder::new().build())
     .plugin(gacha::GachaPluginBuilder::new().build())
     .setup(|app| {
-      let open_devtools = cfg!(debug_assertions) || std::env::var("DEVTOOLS").is_ok();
-      if open_devtools {
-        use tauri::Manager;
-        app.get_window("main").unwrap().open_devtools();
+      use tauri::Manager;
+      let main_window = app.get_window("main").unwrap();
+
+      #[cfg(windows)]
+      fixed_hdpi_problem(&main_window);
+
+      if cfg!(debug_assertions) || std::env::var("DEVTOOLS").is_ok() {
+        main_window.open_devtools();
       }
       Ok(())
     })
@@ -31,3 +35,40 @@ fn main() {
     .run(tauri::generate_context!())
     .expect("error while running tauri application")
 }
+
+// See: https://github.com/lgou2w/HoYo.Gacha/issues/40
+// It's not a perfect fix.
+#[cfg(windows)]
+fn fixed_hdpi_problem(window: &tauri::Window) {
+  use windows::Win32::UI::WindowsAndMessaging::GetSystemMetrics;
+  use windows::Win32::UI::WindowsAndMessaging::{SM_CXSCREEN, SM_CYSCREEN};
+
+  let (_screen_width, screen_height) =
+    unsafe { (GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN)) };
+
+  // If under 1080P, maximize the window
+  //   and allow resize width and height.
+  if screen_height < 1080 {
+    window.maximize().unwrap();
+    return;
+  }
+
+  let scale_factor = window.scale_factor().unwrap();
+
+  const WIDTH: f64 = 1152.;
+  const HEIGHT: f64 = 864.;
+
+  // If the scaling factor is greater than 1.0,
+  //   then adjust the window height.
+  if scale_factor > 1. {
+    let new_height = HEIGHT / scale_factor;
+    window
+      .set_size(tauri::LogicalSize::new(WIDTH, new_height))
+      .unwrap();
+  }
+
+  // Only the minimum height adjustment is allowed
+  window
+    .set_min_size(Some(tauri::LogicalSize::new(WIDTH, 0.)))
+    .unwrap();
+}
diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index 339d8166..f10f9c92 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -63,13 +63,11 @@
     "windows": [
       {
         "fullscreen": false,
-        "height": 864,
         "resizable": true,
         "center": true,
         "title": "HoYo.Gacha",
         "width": 1152,
-        "minHeight": 864,
-        "minWidth": 1152
+        "height": 864
       }
     ]
   }