细节优化

Magpie/MagWindow.cs

@@ -64,11 +64,22 @@ namespace Magpie {
                 return;
             }
 
+            IntPtr hwndSrc = NativeMethods.GetForegroundWindow();
+            if (!NativeMethods.IsWindow(hwndSrc) 
+                || !NativeMethods.IsWindowVisible(hwndSrc) 
+                || NativeMethods.GetWindowShowCmd(hwndSrc) != NativeMethods.SW_NORMAL
+            ) {
+                // 不合法的源窗口
+                return;
+            }
+
+            Status = MagWindowStatus.Starting;
             // 使用 WinRT Capturer API 需要在 MTA 中
             // C# 窗体必须使用 STA，因此将全屏窗口创建在新的线程里
             magThread = new Thread(() => {
                 NativeMethods.RunMagWindow(
                     (int status, IntPtr errorMsg) => StatusEvent(status, Marshal.PtrToStringUni(errorMsg)),
+                    hwndSrc,        // 源窗口句柄
                     scaleModel,     // 缩放模式
                     captureMode,    // 抓取模式
                     showFPS,        // 显示 FPS
@@ -79,7 +90,7 @@ namespace Magpie {
             magThread.Start();
 
             if (hookCursorAtRuntime) {
-                HookCursorAtRuntime();
+                HookCursorAtRuntime(hwndSrc);
             }
         }
 
@@ -93,8 +104,7 @@ namespace Magpie {
             NativeMethods.BroadcastMessage(NativeMethods.MAGPIE_WM_DESTORYMAG);
         }
 
-        private void HookCursorAtRuntime() {
-            IntPtr hwndSrc = NativeMethods.GetForegroundWindow();
+        private void HookCursorAtRuntime(IntPtr hwndSrc) {
             int pid = NativeMethods.GetWindowProcessId(hwndSrc);
             if (pid == 0 || pid == Process.GetCurrentProcess().Id) {
                 // 不能 hook 本进程

Magpie/MainForm.cs

@@ -191,39 +191,44 @@ namespace Magpie {
         }
 
         private void StartScaleTimer() {
-            if (timerScale.Enabled) {
-                // 已经开始倒计时
-                return;
-            }
-
             countDownNum = DOWN_COUNT;
-            btnScale.Text = countDownNum.ToString();
-            btnScale.Enabled = false;
+            tsmiScale.Text = btnScale.Text = countDownNum.ToString();
 
             timerScale.Interval = 1000;
-            timerScale.Enabled = true;
+            timerScale.Start();
+        }
+
+        private void StopScaleTimer() {
+            timerScale.Stop();
+            tsmiScale.Text = btnScale.Text = "5秒后放大";
+        }
+
+        private void ToggleScaleTimer() {
+            if (timerScale.Enabled) {
+                StopScaleTimer();
+            } else {
+                StartScaleTimer();
+            }
         }
 
         private void BtnScale_Click(object sender, EventArgs e) {
-            StartScaleTimer();
+            ToggleScaleTimer();
         }
 
         private void TimerScale_Tick(object sender, EventArgs e) {
             if(--countDownNum != 0) {
-                btnScale.Text = countDownNum.ToString();
+                tsmiScale.Text = btnScale.Text = countDownNum.ToString();
                 return;
             }
 
             // 计时结束
-            timerScale.Enabled = false;
-            btnScale.Text = "5秒后放大";
-            btnScale.Enabled = true;
+            StopScaleTimer();
 
             ToggleMagWindow();
         }
 
         private void TsmiScale_Click(object sender, EventArgs e) {
-            StartScaleTimer();
+            ToggleScaleTimer();
         }
     }
 }

Magpie/NativeMethods.cs

@@ -10,12 +10,20 @@ namespace Magpie {
 	static class NativeMethods {
         public static readonly int MAGPIE_WM_SHOWME = RegisterWindowMessage("WM_SHOWME");
         public static readonly int MAGPIE_WM_DESTORYMAG = RegisterWindowMessage("MAGPIE_WM_DESTORYMAG");
-        
+        public static readonly int SW_NORMAL = 1;
 
         // 获取用户当前正在使用的窗体的句柄
         [DllImport("user32", CharSet = CharSet.Unicode)]
 		public static extern IntPtr GetForegroundWindow();
 
+        [DllImport("user32", CharSet = CharSet.Unicode)]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        public static extern bool IsWindow(IntPtr hWnd);
+
+        [DllImport("user32", CharSet = CharSet.Unicode)]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        public static extern bool IsWindowVisible(IntPtr hWnd);
+
         [DllImport("user32", CharSet = CharSet.Unicode)]
         [return: MarshalAs(UnmanagedType.Bool)]
         public static extern bool SetForegroundWindow(IntPtr hWnd);
@@ -45,16 +53,52 @@ namespace Magpie {
             return processId;
         }
 
+        [StructLayout(LayoutKind.Sequential)]
+        private struct POINT {
+            public int x;
+            public int y;
+        }
+        [StructLayout(LayoutKind.Sequential)]
+        struct RECT {
+            public int left;
+            public int top;
+            public int right;
+            public int bottom;
+        }
+        [StructLayout(LayoutKind.Sequential)]
+        struct WINDOWPLACEMENT {
+            public uint length;
+            public uint flags;
+            public uint showCmd;
+            public POINT ptMinPosition;
+            public POINT ptMaxPosition;
+            public RECT rcNormalPosition;
+        }
+
+        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        private static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
+
+        public static int GetWindowShowCmd(IntPtr hWnd) {
+            WINDOWPLACEMENT wp = new WINDOWPLACEMENT();
+            wp.length = (uint)Marshal.SizeOf(wp);
+            if(!GetWindowPlacement(hWnd, ref wp)) {
+                return -1;
+            }
+            return (int)wp.showCmd;
+        }
+
         /*
          * Runtime.dll
          */
-        
+
         public delegate void ReportStatus(int status, IntPtr errorMsg);
 
         [DllImport("Runtime", CallingConvention = CallingConvention.StdCall)]
         [return: MarshalAs(UnmanagedType.U1)]
         public static extern void RunMagWindow(
             ReportStatus reportStatus,
+            IntPtr hwndSrc,
             [MarshalAs(UnmanagedType.LPUTF8Str)] string scaleModel,
             int captureMode,
             [MarshalAs(UnmanagedType.U1)] bool showFPS,

README.md

@@ -2,7 +2,7 @@
 
 窗口放大镜！
 
-可以将任意窗口全屏显示，支持高级缩放算法，包括 Jinc、[Anime4K](https://github.com/bloc97/Anime4K)（本项目包含一个Direct2D Effect移植）、Lanczos等。
+可以将任意窗口全屏显示，支持高级缩放算法，包括[Anime4K](https://github.com/bloc97/Anime4K)（本项目包含一个Direct2D移植）、Lanczos等。
 
 主要用于游戏窗口的放大显示，适用于那些不支持全屏模式，或者游戏自带的全屏模式会使画面模糊的情况。
 

Runtime/DllMain.cpp

@@ -32,27 +32,25 @@ BOOL APIENTRY DllMain(
 
 API_DECLSPEC void WINAPI RunMagWindow(
     void reportStatus(int status, const wchar_t* errorMsg),
+    HWND hwndSrc,
     const char* scaleModel,
     int captureMode,
     bool showFPS,
     bool noDisturb
 ) {
-    reportStatus(1, nullptr);
-
     Debug::ThrowIfComFailed(
         CoInitializeEx(NULL, COINIT_MULTITHREADED),
         L"初始化 COM 出错"
     );
 
     try {
-        HWND hwndSrc = GetForegroundWindow();
-        Debug::ThrowIfWin32Failed(
-            hwndSrc,
-            L"获取前台窗口失败"
+        Debug::Assert(
+            IsWindow(hwndSrc) && IsWindowVisible(hwndSrc) && Utils::GetWindowShowCmd(hwndSrc) == SW_NORMAL,
+            L"不合法的源窗口"
         );
         Debug::Assert(
-            Utils::GetWindowShowCmd(hwndSrc) == SW_NORMAL,
-            L"该窗口当前已最大化或最小化"
+            captureMode >= 0 && captureMode <= 1,
+            L"非法的抓取模式"
         );
 
         Env::CreateInstance(hInst, hwndSrc, scaleModel, captureMode, showFPS, noDisturb);

Runtime/Env.h

@@ -28,8 +28,6 @@ public:
 		_d2dFactory = d2dFactory;
 		_d2dDevice = d2dDevice;
 		_d2dDC = d2dDC;
-
-		
 	}
 
 	void SetHwndHost(HWND hwndHost) {
@@ -135,12 +133,9 @@ private:
 		int captureMode,
 		bool showFPS,
 		bool noDisturb
-	) : _hInst(hInst), _hwndSrc(hwndSrc), _scaleModel(scaleModel), _captureMode(captureMode), _showFPS(showFPS), _noDisturb(noDisturb) {
-		Debug::Assert(
-			captureMode >= 0 && captureMode <= 1,
-			L"非法的抓取模式"
-		);
-
+	) : _hInst(hInst), _hwndSrc(hwndSrc), _scaleModel(scaleModel),
+		_captureMode(captureMode), _showFPS(showFPS), _noDisturb(noDisturb)
+	{
 		Utils::GetClientScreenRect(_hwndSrc, _srcClient);
 	}
 

Runtime/MagWindow.h

@@ -59,12 +59,6 @@ private:
             Debug::Assert(false, L"已存在全屏窗口");
         }
 
-        HWND hwndSrc = Env::$instance->GetHwndSrc();
-        Debug::Assert(
-            IsWindow(hwndSrc) && IsWindowVisible(hwndSrc),
-            L"hwndSrc 不合法"
-        );
-
         _RegisterHostWndClass();
         _CreateHostWnd();
 

Runtime/Utils.h

@@ -10,6 +10,7 @@ public:
         assert(hwnd != NULL);
 
         WINDOWPLACEMENT wp{};
+        wp.length = sizeof(wp);
         Debug::ThrowIfWin32Failed(
             GetWindowPlacement(hwnd, &wp),
             L"GetWindowPlacementʧ°Ü"