Refactor cursors to C++ and improve isolation

src/interface/Cursors.cpp

@@ -0,0 +1,118 @@
+#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
+/*****************************************************************************
+ * OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
+ *
+ * OpenRCT2 is the work of many authors, a full list can be found in contributors.md
+ * For more information, visit https://github.com/OpenRCT2/OpenRCT2
+ *
+ * OpenRCT2 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * A full copy of the GNU General Public License can be found in licence.txt
+ *****************************************************************************/
+#pragma endregion
+
+#include <SDL_mouse.h>
+#include "../core/Guard.hpp"
+#include "Cursors.h"
+
+namespace Cursors
+{
+    constexpr sint32 CURSOR_WIDTH = 32;
+    constexpr sint32 CURSOR_HEIGHT = 32;
+
+    static const CursorData * RawCursorData[CURSOR_COUNT];
+
+    static SDL_Cursor * _loadedCursors[CURSOR_COUNT];
+    static bool         _initialised = false;
+    static CURSOR_ID    _currentCursor = CURSOR_UNDEFINED;
+
+    static SDL_Cursor * Create(const CursorData * cursorInfo)
+    {
+        SDL_Cursor * cursor = SDL_CreateCursor(
+            cursorInfo->Data,
+            cursorInfo->Mask,
+            CURSOR_WIDTH,
+            CURSOR_HEIGHT,
+            cursorInfo->HotSpot.X,
+            cursorInfo->HotSpot.Y);
+        return cursor;
+    }
+
+    void Initialise()
+    {
+        Guard::Assert(!_initialised, "Cursors have already been initialised.");
+        _initialised = true;
+
+        // Using system cursors
+        _loadedCursors[CURSOR_ARROW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW);
+        _loadedCursors[CURSOR_HAND_POINT] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_HAND);
+
+        // Using custom cursors
+        for (size_t i = 0; i < CURSOR_COUNT; i++)
+        {
+            const CursorData * cursorData = GetCursorData((CURSOR_ID)i);
+            if (cursorData != nullptr)
+            {
+                _loadedCursors[i] = Create(cursorData);
+            }
+        }
+
+        _currentCursor = CURSOR_UNDEFINED;
+        SetCurrentCursor(CURSOR_ARROW);
+    }
+
+    void Dispose()
+    {
+        if (_initialised)
+        {
+            for (size_t i = 0; i < CURSOR_COUNT; i++)
+            {
+                SDL_FreeCursor(_loadedCursors[i]);
+                _loadedCursors[i] = nullptr;
+            }
+            _currentCursor = CURSOR_UNDEFINED;
+            _initialised = false;
+        }
+    }
+
+    CURSOR_ID GetCurrentCursor()
+    {
+        return _currentCursor;
+    }
+
+    void SetCurrentCursor(CURSOR_ID cursorId)
+    {
+        if (_currentCursor != cursorId)
+        {
+            SDL_Cursor * cursor = _loadedCursors[cursorId];
+            SDL_SetCursor(cursor);
+            _currentCursor = cursorId;
+        }
+    }
+}
+
+extern "C"
+{
+    void cursors_initialise()
+    {
+        Cursors::Initialise();
+    }
+
+    void cursors_dispose()
+    {
+        Cursors::Dispose();
+    }
+
+    int cursors_getcurrentcursor()
+    {
+        return Cursors::GetCurrentCursor();
+    }
+
+    void cursors_setcurrentcursor(int cursorId)
+    {
+        Cursors::SetCurrentCursor((CURSOR_ID)cursorId);
+    }
+}