[idd] CEdid: add new helper class to build the EDID block

idd/LGIdd/CEdid.h

@@ -0,0 +1,34 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#pragma once
+
+#include <Windows.h>
+#include <stdint.h>
+#include <vector>
+
+#include "CSettings.h"
+
+class CEdid
+{
+public:
+  void Build(const CSettings::DisplayModes& modes);
+
+  const BYTE* Data() const { return m_data.empty() ? nullptr : m_data.data(); }
+  UINT Size() const { return (UINT)m_data.size(); }
+
+private:
+  std::vector<BYTE> m_data;
+
+  static void SetChecksum(BYTE* block);
+  static bool WriteDetailedTiming(BYTE* dtd, const CSettings::DisplayMode& mode);
+  static void WriteMonitorName(BYTE* desc, const char* name);
+};