Add mouse cursor handling

GpCommon/GpColorCursor_Win32.cpp

@@ -0,0 +1,58 @@
+#include "GpColorCursor_Win32.h"
+
+#include <stdlib.h>
+#include <new>
+
+void GpColorCursor_Win32::Destroy()
+{
+	this->DecRef();
+}
+
+GpColorCursor_Win32 *GpColorCursor_Win32::Load(const wchar_t *path)
+{
+	HANDLE imageH = LoadImageW(nullptr, path, IMAGE_CURSOR, 0, 0, LR_LOADFROMFILE);
+
+	if (imageH == nullptr)
+		return nullptr;
+
+	HCURSOR cursor = reinterpret_cast<HCURSOR>(imageH);
+	void *storage = malloc(sizeof(GpColorCursor_Win32));
+	if (!storage)
+	{
+		DestroyCursor(cursor);
+		return nullptr;
+	}
+
+	return new (storage) GpColorCursor_Win32(reinterpret_cast<HCURSOR>(cursor));
+}
+
+GpColorCursor_Win32::GpColorCursor_Win32(HCURSOR cursor)
+	: m_cursor(cursor)
+	, m_refCount(1)
+{
+}
+
+GpColorCursor_Win32::~GpColorCursor_Win32()
+{
+	DestroyCursor(m_cursor);
+}
+
+const HCURSOR &GpColorCursor_Win32::GetHCursor() const
+{
+	return m_cursor;
+}
+
+void GpColorCursor_Win32::IncRef()
+{
+	m_refCount++;
+}
+
+void GpColorCursor_Win32::DecRef()
+{
+	m_refCount--;
+	if (m_refCount == 0)
+	{
+		this->~GpColorCursor_Win32();
+		free(this);
+	}
+}