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engines/bagel/mfc/gdi_object.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "common/textconsole.h"
+#include "bagel/mfc/afxwin.h"
+#include "bagel/mfc/win_hand.h"
+
+namespace Bagel {
+namespace MFC {
+
+IMPLEMENT_DYNCREATE(CGdiObject, CObject)
+
+CGdiObject::~CGdiObject() {
+	if (m_hObject && _permanent)
+		DeleteObject();
+}
+
+bool CGdiObject::Attach(HGDIOBJ hObject) {
+	// Detach any prior object
+	Detach();
+
+	// Attach new object
+	m_hObject = hObject;
+	AfxHookObject();
+
+	return true;
+}
+
+HGDIOBJ CGdiObject::Detach() {
+	HGDIOBJ result = m_hObject;
+	AfxUnhookObject();
+
+	return result;
+}
+
+bool CGdiObject::DeleteObject() {
+	AfxUnhookObject();
+
+	// Check added to ensure I don't accidentally
+	// delete the _defaultBitmap field of the CDC::Impl
+	assert(!dynamic_cast<CDC::DefaultBitmap *>(this));
+
+	delete m_hObject;
+	m_hObject = nullptr;
+	return true;
+}
+
+CGdiObject *CGdiObject::FromHandle(HGDIOBJ h) {
+	CHandleMap<CGdiObject> *pMap = AfxGetApp()->afxMapHGDIOBJ(true);
+	assert(pMap != nullptr);
+
+	CGdiObject *pObject = pMap->FromHandle(h);
+	assert(pObject == nullptr || pObject->m_hObject == h);
+	return pObject;
+}
+
+void CGdiObject::AfxHookObject() {
+	CHandleMap<CGdiObject> *pMap = AfxGetApp()->afxMapHGDIOBJ(true);
+	assert(pMap != nullptr);
+
+	if (!pMap->LookupPermanent(m_hObject)) {
+		pMap->SetPermanent(m_hObject, this);
+		_permanent = true;
+	}
+}
+
+void CGdiObject::AfxUnhookObject() {
+	if (m_hObject && _permanent) {
+		CHandleMap<CGdiObject> *pMap = AfxGetApp()->afxMapHGDIOBJ(true);
+		assert(pMap != nullptr);
+
+		pMap->RemoveHandle(m_hObject);
+		_permanent = false;
+	}
+}
+
+
+} // namespace MFC
+} // namespace Bagel