Screen backdrop (schema v5/v6) + five-scene catalog + webcam polish: live desktop/game capture as a permanent non-deletable bottom layer (Source.IsBackdrop), auto full-screen game detection (Win32FullScreenDetector) else primary display, GraphicsCapturePicker re-designation, refcounted shared ScreenCaptureManager, Live-only backdrop by policy (HasBackdrop + v5-v6 backfill + EnforceBackdropPolicy, checkbox gone), SceneCatalog (Starting/Live/BRB/Chat/Ending) with + button re-adding missing scenes, webcam mid-session transparent-container fix (GetPreviewBitmap propagation), Chat half-screen-area cap, 'Add Webcam' always opens the picker (SwapWebcamIdentityAsync, no silent resurrect), WindowsRuntimeMarshal frame-read + 5s-throttled errors, docs updated, tests (65 passing)
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using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using System.Windows.Interop;
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namespace ytLive.Services;
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/// <summary>A physical display: its capture-key index, geometry, and primary flag.</summary>
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public sealed record DisplayInfo(int Index, string Name, int Width, int Height, int X, int Y, bool IsPrimary)
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{
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public string Label
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=> IsPrimary ? $"{Name} — {Width}×{Height} (primary)" : $"{Name} — {Width}×{Height}";
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}
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/// <summary>
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/// Win32 detection: <c>GetForegroundWindow</c> + <c>DwmGetWindowAttribute</c>
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/// (DWMWA_EXTENDED_FRAME_BOUNDS) + <c>MonitorFromWindow</c> + <c>GetMonitorInfo</c>.
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/// A foreground window whose extended frame bounds cover an entire monitor is
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/// treated as a full-screen game/app on that monitor's index (monitor order =
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/// <c>EnumDisplayMonitors</c> enumeration order, the same order the capture
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/// factory uses to map index → HMONITOR). Windows of our own process are excluded.
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/// DRM-protected content captures as black frames — a documented OS limit.
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/// </summary>
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public sealed class Win32FullScreenDetector : IFullScreenDetector
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{
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private const int DwmwaExtendedFrameBounds = 9;
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private const uint MonitorDefaultToNearest = 2;
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private const uint MonitorInfoFPrimary = 0x00000001;
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public int? GetForegroundFullScreenMonitorIndex()
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{
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var hwnd = GetForegroundWindow();
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if (hwnd == IntPtr.Zero || IsOwnWindow(hwnd)) return null;
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if (!TryGetExtendedFrameBounds(hwnd, out var bounds)) return null;
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var monitor = MonitorFromWindow(hwnd, MonitorDefaultToNearest);
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if (monitor == IntPtr.Zero || !TryGetMonitorInfo(monitor, out var info)) return null;
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var r = info.RcMonitor;
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var coversMonitor = bounds.Left <= r.Left && bounds.Top <= r.Top &&
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bounds.Right >= r.Right && bounds.Bottom >= r.Bottom;
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if (!coversMonitor) return null;
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return MonitorIndex(monitor);
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}
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private static bool IsOwnWindow(IntPtr hwnd)
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{
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_ = GetWindowThreadProcessId(hwnd, out var pid);
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return pid == Environment.ProcessId;
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}
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private static bool TryGetExtendedFrameBounds(IntPtr hwnd, out Win32Rect bounds)
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{
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bounds = default;
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return DwmGetWindowAttribute(hwnd, DwmwaExtendedFrameBounds, ref bounds, Marshal.SizeOf<Win32Rect>()) == 0;
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}
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private static bool TryGetMonitorInfo(IntPtr monitor, out MonitorInfo info)
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{
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info = new MonitorInfo { CbSize = Marshal.SizeOf<MonitorInfo>() };
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return GetMonitorInfo(monitor, ref info);
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}
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private static int? MonitorIndex(IntPtr monitor)
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{
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var handles = EnumerateMonitors();
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var index = handles.IndexOf(monitor);
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return index >= 0 ? index : null;
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}
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public int PrimaryMonitorIndex()
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=> GetDisplays().FirstOrDefault(d => d.IsPrimary)?.Index ?? 0;
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public IReadOnlyList<DisplayInfo> GetDisplays()
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{
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var result = new List<DisplayInfo>();
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var handles = EnumerateMonitors();
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for (var i = 0; i < handles.Count; i++)
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{
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if (!TryGetMonitorInfo(handles[i], out var info)) continue;
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var name = GetDisplayName(handles[i]);
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result.Add(new DisplayInfo(
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i,
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name,
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info.RcMonitor.Right - info.RcMonitor.Left,
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info.RcMonitor.Bottom - info.RcMonitor.Top,
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info.RcMonitor.Left,
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info.RcMonitor.Top,
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(info.DwFlags & MonitorInfoFPrimary) != 0));
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}
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return result;
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}
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private static string GetDisplayName(IntPtr monitor)
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{
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var info = new MonitorInfoEx { CbSize = Marshal.SizeOf<MonitorInfoEx>() };
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if (!GetMonitorInfo(monitor, ref info)) return $"Display {monitor}";
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var deviceName = info.SzDevice.TrimEnd('\0');
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var dev = new DisplayDevice { Cb = Marshal.SizeOf<DisplayDevice>() };
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if (!EnumDisplayDevices(deviceName, 0, ref dev, 0)) return deviceName;
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var friendly = dev.DeviceString.TrimEnd('\0');
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return string.IsNullOrWhiteSpace(friendly) ? deviceName : friendly;
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}
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public static IntPtr GetMonitorHandle(int index)
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{
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var handles = EnumerateMonitors();
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return index >= 0 && index < handles.Count ? handles[index] : IntPtr.Zero;
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}
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private static List<IntPtr> EnumerateMonitors()
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{
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var handles = new List<IntPtr>();
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EnumDisplayMonitors(IntPtr.Zero, IntPtr.Zero,
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(IntPtr hMonitor, IntPtr hdcMonitor, ref Win32Rect lprcMonitor, IntPtr dwData) =>
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{
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handles.Add(hMonitor);
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return true;
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}, IntPtr.Zero);
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return handles;
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}
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[StructLayout(LayoutKind.Sequential)]
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private struct Win32Rect
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{
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public int Left;
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public int Top;
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public int Right;
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public int Bottom;
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}
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[StructLayout(LayoutKind.Sequential)]
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private struct MonitorInfo
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{
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public int CbSize;
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public Win32Rect RcMonitor;
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public Win32Rect RcWork;
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public uint DwFlags;
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}
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[StructLayout(LayoutKind.Sequential)]
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private struct MonitorInfoEx
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{
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public int CbSize;
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public Win32Rect RcMonitor;
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public Win32Rect RcWork;
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public uint DwFlags;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
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public string SzDevice;
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}
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[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
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private struct DisplayDevice
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{
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public int Cb;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
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public string DeviceName;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
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public string DeviceString;
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public uint StateFlags;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
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public string DeviceId;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
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public string DeviceKey;
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}
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[DllImport("user32.dll")]
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private static extern IntPtr GetForegroundWindow();
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[DllImport("user32.dll")]
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private static extern IntPtr MonitorFromWindow(IntPtr hwnd, uint dwFlags);
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[DllImport("user32.dll", CharSet = CharSet.Unicode)]
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private static extern bool GetMonitorInfo(IntPtr hMonitor, ref MonitorInfo lpmi);
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[DllImport("user32.dll", CharSet = CharSet.Unicode)]
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private static extern bool GetMonitorInfo(IntPtr hMonitor, ref MonitorInfoEx lpmi);
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[DllImport("user32.dll", CharSet = CharSet.Unicode)]
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private static extern bool EnumDisplayDevices(string lpDevice, uint iDevNum, ref DisplayDevice lpDisplayDevice, uint dwFlags);
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[DllImport("user32.dll")]
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private static extern bool EnumDisplayMonitors(IntPtr hdc, IntPtr lprcClip,
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MonitorEnumProc lpfnEnum, IntPtr dwData);
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[DllImport("user32.dll")]
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private static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);
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[DllImport("dwmapi.dll")]
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private static extern int DwmGetWindowAttribute(IntPtr hwnd, int dwAttribute, ref Win32Rect pvAttribute, int cbAttribute);
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private delegate bool MonitorEnumProc(IntPtr hMonitor, IntPtr hdcMonitor, ref Win32Rect lprcMonitor, IntPtr dwData);
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}
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