[idd] transport: centralize source and control state

idd/LGIdd/transport/CControlHub.h

@@ -0,0 +1,65 @@
+/**
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#pragma once
+
+#include "CSRWLock.h"
+#include "transport/IControlTransport.h"
+#include "transport/ITransport.h"
+
+#include <memory>
+#include <vector>
+
+class CControlHub final : public IControlTransport
+{
+private:
+  struct Sink
+  {
+    BackendId          backend;
+    uint32_t           epoch;
+    CSRWLock           lock;
+    IControlTransport * control;
+  };
+
+  mutable CSRWLock                   m_sinkLock;
+  std::vector<std::shared_ptr<Sink>> m_sinks;
+
+  mutable CSRWLock m_stateLock;
+  std::shared_ptr<const D12ColorTransform> m_colorTransform;
+  IDARG_OUT_QUERY_HWCURSOR m_cursor = {};
+  std::vector<BYTE>        m_cursorData;
+  UINT                     m_sdrWhiteLevel = 0;
+  bool                     m_cursorValid   = false;
+  bool                     m_shapeValid    = false;
+
+  std::vector<std::shared_ptr<Sink>> Snapshot() const;
+  void Replay(const std::shared_ptr<Sink>& sink);
+
+public:
+  bool Add(BackendId backend, uint32_t epoch, IControlTransport& control);
+  void Remove(BackendId backend, uint32_t epoch);
+
+  void SendCursor(const IDARG_OUT_QUERY_HWCURSOR& info,
+    const BYTE * data, UINT sdrWhiteLevel) override;
+  void SetColorTransform(
+    std::shared_ptr<const D12ColorTransform> transform) override;
+  std::shared_ptr<const D12ColorTransform>
+    GetColorTransform() const override;
+};