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https://github.com/nomi-san/parsec-vdd.git
synced 2026-08-07 05:20:44 +00:00
feat(mirror): add mirror window
This commit is contained in:
Nguyen Duy
@@ -0,0 +1,405 @@
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using System;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.Drawing;
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using System.Runtime.InteropServices;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace ParsecVDisplay
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{
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public class MirrorWindow : Form
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{
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const double FPS = 60.0;
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const double FRAME_TIME = 1000.0 / FPS;
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private bool IsMirroring;
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private Thread MirrorThread;
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private TaskCompletionSource<IntPtr> WhenHwnd;
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public MirrorWindow()
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{
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IsMirroring = false;
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WhenHwnd = new TaskCompletionSource<IntPtr>();
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ClientSize = new Size(960, 540);
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Icon = Icon.ExtractAssociatedIcon(Application.ExecutablePath);
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}
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protected override void OnClosing(CancelEventArgs e)
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{
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IsMirroring = false;
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MirrorThread?.Join();
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base.OnClosing(e);
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}
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protected override void OnPaint(PaintEventArgs e)
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{
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}
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protected override void OnPaintBackground(PaintEventArgs e)
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{
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}
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protected override void OnHandleCreated(EventArgs e)
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{
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base.OnHandleCreated(e);
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WhenHwnd.SetResult(Handle);
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}
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public void MirrorScreen(string displayDevice)
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{
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if (!IsMirroring)
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{
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IsMirroring = true;
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Text = $"Mirror - {displayDevice}";
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MirrorThread = new Thread(() => MirrorWorker(displayDevice));
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MirrorThread.IsBackground = true;
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MirrorThread.Start();
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}
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}
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private void MirrorWorker(string displayDevice)
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{
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var hwnd = WhenHwnd.Task.Result;
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var dcDest = Native.GetDC(hwnd);
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var bgBrush = Native.GetStockObject(/*BLACK_BRUSH*/ 4);
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var devmode = default(Native.DEVMODE);
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short devmodeSize = (short)Marshal.SizeOf<Native.DEVMODE>();
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try
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{
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var stopwatch = Stopwatch.StartNew();
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double previousTime = stopwatch.Elapsed.TotalMilliseconds;
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while (IsMirroring)
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{
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double currentTime = stopwatch.Elapsed.TotalMilliseconds;
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double elapsedTime = currentTime - previousTime;
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if (elapsedTime >= FRAME_TIME)
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{
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devmode.dmSize = devmodeSize;
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if (Native.EnumDisplaySettings(displayDevice, -1, ref devmode))
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{
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var dcScreens = Native.GetDC(IntPtr.Zero);
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var client = GetClientSize(hwnd);
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var screen = new Rectangle(devmode.dmPositionX, devmode.dmPositionY, devmode.dmPelsWidth, devmode.dmPelsHeight);
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var vp = GetViewport(client.Width, client.Height, screen.Width, screen.Height);
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DrawBackground(dcDest, bgBrush, ref client, ref vp);
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DrawScreen(dcDest, dcScreens, ref vp, ref screen);
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DrawCursor(dcDest, ref vp, ref screen);
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Native.ReleaseDC(IntPtr.Zero, dcScreens);
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}
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previousTime = currentTime;
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}
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else
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{
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int sleepTime = (int)(FRAME_TIME - elapsedTime);
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if (sleepTime > 0)
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Thread.Sleep(sleepTime);
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}
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}
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}
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finally
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{
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Native.ReleaseDC(hwnd, dcDest);
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Native.DeleteObject(bgBrush);
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}
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}
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private struct Viewport
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{
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public int X;
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public int Y;
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public int Width;
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public int Height;
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}
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private void DrawBackground(IntPtr dc, IntPtr brush, ref Size client, ref Viewport vp)
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{
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var rect = default(Rectangle);
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// fill the excluded rectangles (areas outside the viewport)
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// this is the simplest way to avoid flickering without WM_PAINT
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// top excluded rect
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if (vp.Y > 0)
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{
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rect.X = 0;
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rect.Y = 0;
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rect.Width = client.Width;
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rect.Height = vp.Y;
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Native.FillRect(dc, ref rect, brush);
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}
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// bottom excluded rect
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if (vp.Y + vp.Height < client.Height)
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{
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rect.X = 0;
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rect.Y = vp.Y + vp.Height;
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rect.Width = client.Width;
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rect.Height = client.Height;
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Native.FillRect(dc, ref rect, brush);
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}
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// left excluded rect
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if (vp.X > 0)
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{
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rect.X = 0;
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rect.Y = vp.Y;
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rect.Width = vp.X;
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rect.Height = vp.Height + vp.Y;
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Native.FillRect(dc, ref rect, brush);
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}
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// right excluded rect
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if (vp.X + vp.Width < client.Width)
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{
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rect.X = vp.X + vp.Width;
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rect.Y = vp.Y;
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rect.Width = client.Width;
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rect.Height = vp.Height + vp.Y;
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Native.FillRect(dc, ref rect, brush);
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}
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}
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private void DrawScreen(IntPtr dc, IntPtr dcSrc, ref Viewport vp, ref Rectangle screen)
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{
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// set scaling mode
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Native.SetStretchBltMode(dc, /*HALFTONE*/ 4);
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// draw the screen
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Native.StretchBlt(
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dc,
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vp.X, vp.Y, vp.Width, vp.Height,
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dcSrc,
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screen.X, screen.Y, screen.Width, screen.Height,
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Native.SRCCOPY
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);
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}
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private void DrawCursor(IntPtr dc, ref Viewport vp, ref Rectangle screen)
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{
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var cursor = default(Native.CURSORINFO);
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cursor.cbSize = Marshal.SizeOf<Native.CURSORINFO>();
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if (Native.GetCursorInfo(ref cursor)
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// cursor must be inside the screen
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&& screen.Contains(cursor.screenPosX, cursor.screenPosY)
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// and visible
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&& cursor.flags == /*CURSOR_SHOWING*/ 0x1)
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{
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var iconInfo = default(Native.ICONINFO);
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Native.GetIconInfo(cursor.hCursor, ref iconInfo);
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var bmpCursor = default(Native.BITMAP);
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Native.GetObject(iconInfo.hbmColor, Marshal.SizeOf<Native.BITMAP>(), ref bmpCursor);
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int x = cursor.screenPosX - iconInfo.xHotspot - screen.X;
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int y = cursor.screenPosY - iconInfo.yHotspot - screen.Y;
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int width = bmpCursor.bmWidth;
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int height = bmpCursor.bmHeight;
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ScaleCursor(ref vp, screen.Size, ref x, ref y, ref width, ref height);
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Native.DrawIconEx(dc, x, y, cursor.hCursor, width, height, 0, IntPtr.Zero, /*DI_NORMAL*/ 0x3);
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}
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}
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private static Size GetClientSize(IntPtr hwnd)
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{
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var rect = new Rectangle();
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Native.GetClientRect(hwnd, ref rect);
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return new Size(rect.Width, rect.Height);
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}
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private static Viewport GetViewport(int clientWidth, int clientHeight, int rectWidth, int rectHeight)
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{
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float clientAspect = (float)clientWidth / clientHeight;
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float rectAspect = (float)rectWidth / rectHeight;
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int viewportX, viewportY;
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int viewportWidth, viewportHeight;
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// compare aspect ratios to determine scaling
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if (clientAspect > rectAspect)
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{
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// client is wider than rect, so scale to fit height
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viewportHeight = clientHeight;
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viewportWidth = (int)(rectAspect * viewportHeight);
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}
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else
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{
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// client is taller than rect, so scale to fit width
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viewportWidth = clientWidth;
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viewportHeight = (int)(viewportWidth / rectAspect);
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}
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// center the viewport
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viewportX = (clientWidth - viewportWidth) / 2;
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viewportY = (clientHeight - viewportHeight) / 2;
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return new Viewport
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{
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X = viewportX,
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Y = viewportY,
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Width = viewportWidth,
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Height = viewportHeight,
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};
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}
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private static void ScaleCursor(ref Viewport viewport, Size screen, ref int cursorX, ref int cursorY, ref int cursorWidth, ref int cursorHeight)
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{
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float scaleX = (float)viewport.Width / screen.Width;
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float scaleY = (float)viewport.Height / screen.Height;
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cursorWidth = (int)(cursorWidth * scaleX);
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cursorHeight = (int)(cursorHeight * scaleY);
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cursorX = viewport.X + (int)(cursorX * scaleX);
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cursorY = viewport.Y + (int)(cursorY * scaleY);
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}
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private static class Native
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{
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public const int ENUM_CURRENT_SETTINGS = -1;
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public const int SRCCOPY = 0x00CC0020;
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[StructLayout(LayoutKind.Sequential)]
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public struct DEVMODE
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{
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
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public string dmDeviceName;
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public short dmSpecVersion;
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public short dmDriverVersion;
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public short dmSize;
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public short dmDriverExtra;
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public int dmFields;
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public int dmPositionX;
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public int dmPositionY;
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public int dmDisplayOrientation;
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public int dmDisplayFixedOutput;
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public short dmColor;
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public short dmDuplex;
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public short dmYResolution;
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public short dmTTOption;
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public short dmCollate;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
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public string dmFormName;
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public short dmLogPixels;
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public int dmBitsPerPel;
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public int dmPelsWidth;
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public int dmPelsHeight;
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public int dmDisplayFlags;
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public int dmDisplayFrequency;
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public int dmICMMethod;
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public int dmICMIntent;
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public int dmMediaType;
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public int dmDitherType;
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public int dmReserved1;
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public int dmReserved2;
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public int dmPanningWidth;
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public int dmPanningHeight;
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}
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[DllImport("user32.dll")]
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[return: MarshalAs(UnmanagedType.Bool)]
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public static extern bool EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE devMode);
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[DllImport("user32.dll")]
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[return: MarshalAs(UnmanagedType.Bool)]
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public static extern bool GetClientRect(IntPtr hwnd, ref Rectangle rect);
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[DllImport("user32.dll")]
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public static extern IntPtr GetDC(IntPtr hwnd);
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[DllImport("user32.dll")]
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public static extern int ReleaseDC(IntPtr hwnd, IntPtr hdc);
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[DllImport("gdi32.dll", SetLastError = true)]
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public static extern IntPtr CreateDC(string lpszDriver, string lpszDevice, string lpszOutput, IntPtr lpInitData);
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[DllImport("gdi32.dll", SetLastError = true)]
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public static extern bool DeleteDC(IntPtr hdc);
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[DllImport("gdi32.dll", SetLastError = true)]
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public static extern bool DeleteObject(IntPtr hObject);
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[DllImport("gdi32.dll")]
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public static extern int SetStretchBltMode(IntPtr hdc, int mode);
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[DllImport("gdi32.dll")]
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public static extern bool StretchBlt(IntPtr hdcDest, int nXOriginDest, int nYOriginDest, int nWidthDest, int nHeightDest,
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IntPtr hdcSrc, int nXOriginSrc, int nYOriginSrc, int nWidthSrc, int nHeightSrc, uint dwRop);
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[StructLayout(LayoutKind.Sequential)]
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public struct BITMAP
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{
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public uint bmType;
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public int bmWidth;
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public int bmHeight;
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public int bmWidthBytes;
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public short bmPlanes;
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public short bmBitsPixel;
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public IntPtr bmBits;
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}
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[StructLayout(LayoutKind.Sequential)]
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public struct ICONINFO
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{
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public int fIcon;
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public int xHotspot;
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public int yHotspot;
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public IntPtr hbmMask;
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public IntPtr hbmColor;
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}
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[StructLayout(LayoutKind.Sequential)]
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public struct CURSORINFO
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{
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public int cbSize;
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public uint flags;
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public IntPtr hCursor;
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public int screenPosX;
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public int screenPosY;
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}
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[DllImport("user32.dll")]
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[return: MarshalAs(UnmanagedType.Bool)]
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public static extern bool GetIconInfo(IntPtr hIcon, ref ICONINFO piconinfo);
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[DllImport("user32.dll")]
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[return: MarshalAs(UnmanagedType.Bool)]
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public static extern bool GetCursorInfo(ref CURSORINFO pci);
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[DllImport("gdi32.dll")]
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public static extern int GetObject(IntPtr h, int c, ref BITMAP pv);
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[DllImport("user32.dll")]
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[return: MarshalAs(UnmanagedType.Bool)]
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public static extern bool DrawIconEx(IntPtr hdc,
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int xLeft, int yTop, IntPtr hIcon, int cxWidth, int cyWidth,
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uint istepIfAniCur, IntPtr hbrFlickerFreeDraw, uint diFlags);
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[DllImport("user32.dll")]
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public static extern int FillRect(IntPtr hDC, ref Rectangle lprc, IntPtr hbr);
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[DllImport("gdi32.dll")]
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public static extern IntPtr GetStockObject(int i);
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}
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}
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}
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