win-capture: Add hook helper functions for IPC

These inline functions simplify the process of using windows IPC
objects, such as mutexes and events.

plugins/win-capture/CMakeLists.txt

@@ -2,6 +2,7 @@ project(win-capture)
 
 set(win-capture_HEADERS
 	obfuscate.h
+	hook-helpers.h
 	window-helpers.h
 	dc-capture.h)
 

plugins/win-capture/hook-helpers.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#if !defined(__cplusplus) && !defined(inline)
+#define inline __inline
+#endif
+
+static inline HANDLE get_event(const char *name)
+{
+	HANDLE event = CreateEventA(NULL, false, false, name);
+	if (!event)
+		event = OpenEventA(EVENT_ALL_ACCESS, false, name);
+
+	return event;
+}
+
+static inline HANDLE get_mutex(const char *name)
+{
+	HANDLE event = CreateMutexA(NULL, false, name);
+	if (!event)
+		event = OpenMutexA(MUTEX_ALL_ACCESS, false, name);
+
+	return event;
+}
+
+static inline HANDLE get_event_plus_id(const char *name, DWORD id)
+{
+	char new_name[64];
+	sprintf(new_name, "%s%d", name, id);
+	return get_event(new_name);
+}
+
+static inline HANDLE get_mutex_plus_id(const char *name, DWORD id)
+{
+	char new_name[64];
+	sprintf(new_name, "%s%d", name, id);
+	return get_mutex(new_name);
+}
+
+static inline bool object_signalled(HANDLE event)
+{
+	if (!event)
+		return false;
+
+	return WaitForSingleObject(event, 0) == WAIT_OBJECT_0;
+}
+