Set and show/hide mouse cursors through a "cursor manager" (analogous to the

recently added (cursor) palette manager) so that the cursor can be properly
restored after returning from the GUI.

If there's any C++ magic that can keep the backend functions from being called
by anything else than these managing classes, that would probably be a good
idea. Also, since the cursor manager keeps a copy of the cursor image, perhaps
there are at least some backends that will no longer need to?

svn-id: r22639

1 files changed, 108 insertions, 0 deletions

diff --git a/graphics/cursorman.cpp b/graphics/cursorman.cpp
new file mode 100644
index 0000000000..c1b8e38a92
--- /dev/null
+++ b/graphics/cursorman.cpp
@@ -0,0 +1,108 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2006 The ScummVM project
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ */
+
+#include "graphics/cursorman.h"
+
+#include "common/system.h"
+#include "common/stack.h"
+
+DECLARE_SINGLETON(Graphics::CursorManager);
+
+namespace Graphics {
+
+static bool g_initialized = false;
+
+CursorManager::CursorManager() {
+	if (!g_initialized) {
+		g_initialized = true;
+		_cursorStack.clear();
+	}
+}
+
+bool CursorManager::isVisible() {
+	if (_cursorStack.empty())
+		return false;
+	return _cursorStack.top()->_visible;
+}
+
+bool CursorManager::showMouse(bool visible) {
+	if (_cursorStack.empty())
+		return false;
+
+	_cursorStack.top()->_visible = visible;
+	return g_system->showMouse(visible);
+}
+
+void CursorManager::pushCursor(const byte *buf, uint w, uint h, int hotspotX, int hotspotY, byte keycolor, int targetScale) {
+	Cursor *cur = new Cursor(buf, w, h, hotspotX, hotspotY, keycolor, targetScale);
+
+	cur->_visible = isVisible();
+	_cursorStack.push(cur);
+
+	if (buf) {
+		g_system->setMouseCursor(cur->_data, w, h, hotspotX, hotspotY, keycolor, targetScale);
+	}
+}
+
+void CursorManager::popCursor() {
+	if (_cursorStack.empty())
+		return;
+
+	Cursor *cur = _cursorStack.pop();
+	delete cur;
+
+	if (!_cursorStack.empty()) {
+		cur = _cursorStack.top();
+		g_system->setMouseCursor(cur->_data, cur->_width, cur->_height, cur->_hotspotX, cur->_hotspotY, cur->_keycolor, cur->_targetScale);
+	}
+
+	g_system->showMouse(isVisible());
+}
+
+void CursorManager::replaceCursor(const byte *buf, uint w, uint h, int hotspotX, int hotspotY, byte keycolor, int targetScale) {
+	if (_cursorStack.empty()) {
+		pushCursor(buf, w, h, hotspotX, hotspotY, keycolor, targetScale);
+		return;
+	}
+
+	Cursor *cur = _cursorStack.top();
+	uint size = w * h;
+
+	if (cur->_size < size) {
+		delete cur->_data;
+		cur->_data = new byte[size];
+		cur->_size = size;
+	}
+
+	if (buf && cur->_data)
+		memcpy(cur->_data, buf, size);
+
+	cur->_width = w;
+	cur->_height = h;
+	cur->_hotspotX = hotspotX;
+	cur->_hotspotY = hotspotY;
+	cur->_keycolor = keycolor;
+	cur->_targetScale = targetScale;
+
+	g_system->setMouseCursor(cur->_data, w, h, hotspotX, hotspotY, keycolor, targetScale);
+}
+
+} // End of namespace Graphics