[idd] transport: isolate interactive services

idd/LGIdd/transport/IInputSource.h

@@ -0,0 +1,76 @@
+/**
+ * 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 <stdint.h>
+
+struct InputSourceId
+{
+  uint32_t client     = 0;
+  uint32_t generation = 0;
+};
+
+struct InputTargetState
+{
+  uint64_t      state = 0;
+  InputSourceId owner;
+  bool          available = false;
+  bool          owned     = false;
+};
+
+enum class InputResult
+{
+  ACCEPTED,
+  BUSY,
+  UNAVAILABLE,
+  STALE,
+};
+
+class IInputTarget
+{
+public:
+  virtual ~IInputTarget() = default;
+
+  virtual InputTargetState GetState(const InputSourceId& source) = 0;
+  virtual void Failed() = 0;
+  virtual InputResult Claim(const InputSourceId& source) = 0;
+  virtual InputResult Touch(const InputSourceId& source) = 0;
+  virtual InputResult Release(
+    const InputSourceId& source, bool reset) = 0;
+  virtual InputResult SendMouseRelative(const InputSourceId& source,
+    int32_t deltaX, int32_t deltaY, int32_t wheel, uint32_t buttons) = 0;
+  virtual InputResult SendMouseAbsolute(const InputSourceId& source,
+    uint16_t x, uint16_t y, int32_t wheel, uint32_t buttons) = 0;
+  virtual InputResult SendKeyboard(const InputSourceId& source,
+    uint8_t modifiers, const uint8_t * keys) = 0;
+  virtual InputResult Reset(const InputSourceId& source) = 0;
+};
+
+class IInputSource
+{
+public:
+  virtual ~IInputSource() = default;
+
+  // Start may issue target calls before it returns. Stop is a callback-
+  // quiescence barrier and leaves no work that can access the target.
+  virtual bool Start(IInputTarget& target) = 0;
+  virtual void Stop() = 0;
+};