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-rw-r--r--src/gui/graphicsview/qgraphicsscene_bsp.cpp296
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diff --git a/src/gui/graphicsview/qgraphicsscene_bsp.cpp b/src/gui/graphicsview/qgraphicsscene_bsp.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qgraphicsscene_bsp_p.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include <QtCore/qstring.h>
+#include <private/qgraphicsitem_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsSceneInsertItemBspTreeVisitor : public QGraphicsSceneBspTreeVisitor
+{
+public:
+ QGraphicsItem *item;
+
+ void visit(QList<QGraphicsItem *> *items)
+ { items->prepend(item); }
+};
+
+class QGraphicsSceneRemoveItemBspTreeVisitor : public QGraphicsSceneBspTreeVisitor
+{
+public:
+ QGraphicsItem *item;
+
+ void visit(QList<QGraphicsItem *> *items)
+ { items->removeAll(item); }
+};
+
+class QGraphicsSceneFindItemBspTreeVisitor : public QGraphicsSceneBspTreeVisitor
+{
+public:
+ QList<QGraphicsItem *> *foundItems;
+ bool onlyTopLevelItems;
+
+ void visit(QList<QGraphicsItem *> *items)
+ {
+ for (int i = 0; i < items->size(); ++i) {
+ QGraphicsItem *item = items->at(i);
+ if (onlyTopLevelItems && item->d_ptr->parent)
+ item = item->topLevelItem();
+ if (!item->d_func()->itemDiscovered && item->d_ptr->visible) {
+ item->d_func()->itemDiscovered = 1;
+ foundItems->prepend(item);
+ }
+ }
+ }
+};
+
+QGraphicsSceneBspTree::QGraphicsSceneBspTree()
+ : leafCnt(0)
+{
+ insertVisitor = new QGraphicsSceneInsertItemBspTreeVisitor;
+ removeVisitor = new QGraphicsSceneRemoveItemBspTreeVisitor;
+ findVisitor = new QGraphicsSceneFindItemBspTreeVisitor;
+}
+
+QGraphicsSceneBspTree::~QGraphicsSceneBspTree()
+{
+ delete insertVisitor;
+ delete removeVisitor;
+ delete findVisitor;
+}
+
+void QGraphicsSceneBspTree::initialize(const QRectF &rect, int depth)
+{
+ this->rect = rect;
+ leafCnt = 0;
+ nodes.resize((1 << (depth + 1)) - 1);
+ nodes.fill(Node());
+ leaves.resize(1 << depth);
+ leaves.fill(QList<QGraphicsItem *>());
+
+ initialize(rect, depth, 0);
+}
+
+void QGraphicsSceneBspTree::clear()
+{
+ leafCnt = 0;
+ nodes.clear();
+ leaves.clear();
+}
+
+void QGraphicsSceneBspTree::insertItem(QGraphicsItem *item, const QRectF &rect)
+{
+ insertVisitor->item = item;
+ climbTree(insertVisitor, rect);
+}
+
+void QGraphicsSceneBspTree::removeItem(QGraphicsItem *item, const QRectF &rect)
+{
+ removeVisitor->item = item;
+ climbTree(removeVisitor, rect);
+}
+
+void QGraphicsSceneBspTree::removeItems(const QSet<QGraphicsItem *> &items)
+{
+ for (int i = 0; i < leaves.size(); ++i) {
+ QList<QGraphicsItem *> newItemList;
+ const QList<QGraphicsItem *> &oldItemList = leaves[i];
+ for (int j = 0; j < oldItemList.size(); ++j) {
+ QGraphicsItem *item = oldItemList.at(j);
+ if (!items.contains(item))
+ newItemList << item;
+ }
+ leaves[i] = newItemList;
+ }
+}
+
+QList<QGraphicsItem *> QGraphicsSceneBspTree::items(const QRectF &rect, bool onlyTopLevelItems) const
+{
+ QList<QGraphicsItem *> tmp;
+ findVisitor->foundItems = &tmp;
+ findVisitor->onlyTopLevelItems = onlyTopLevelItems;
+ climbTree(findVisitor, rect);
+ // Reset discovery bits.
+ for (int i = 0; i < tmp.size(); ++i)
+ tmp.at(i)->d_ptr->itemDiscovered = 0;
+ return tmp;
+}
+
+int QGraphicsSceneBspTree::leafCount() const
+{
+ return leafCnt;
+}
+
+QString QGraphicsSceneBspTree::debug(int index) const
+{
+ const Node *node = &nodes.at(index);
+
+ QString tmp;
+ if (node->type == Node::Leaf) {
+ QRectF rect = rectForIndex(index);
+ if (!leaves[node->leafIndex].isEmpty()) {
+ tmp += QString::fromLatin1("[%1, %2, %3, %4] contains %5 items\n")
+ .arg(rect.left()).arg(rect.top())
+ .arg(rect.width()).arg(rect.height())
+ .arg(leaves[node->leafIndex].size());
+ }
+ } else {
+ if (node->type == Node::Horizontal) {
+ tmp += debug(firstChildIndex(index));
+ tmp += debug(firstChildIndex(index) + 1);
+ } else {
+ tmp += debug(firstChildIndex(index));
+ tmp += debug(firstChildIndex(index) + 1);
+ }
+ }
+
+ return tmp;
+}
+
+void QGraphicsSceneBspTree::initialize(const QRectF &rect, int depth, int index)
+{
+ Node *node = &nodes[index];
+ if (index == 0) {
+ node->type = Node::Horizontal;
+ node->offset = rect.center().x();
+ }
+
+ if (depth) {
+ Node::Type type;
+ QRectF rect1, rect2;
+ qreal offset1, offset2;
+
+ if (node->type == Node::Horizontal) {
+ type = Node::Vertical;
+ rect1.setRect(rect.left(), rect.top(), rect.width(), rect.height() / 2);
+ rect2.setRect(rect1.left(), rect1.bottom(), rect1.width(), rect.height() - rect1.height());
+ offset1 = rect1.center().x();
+ offset2 = rect2.center().x();
+ } else {
+ type = Node::Horizontal;
+ rect1.setRect(rect.left(), rect.top(), rect.width() / 2, rect.height());
+ rect2.setRect(rect1.right(), rect1.top(), rect.width() - rect1.width(), rect1.height());
+ offset1 = rect1.center().y();
+ offset2 = rect2.center().y();
+ }
+
+ int childIndex = firstChildIndex(index);
+
+ Node *child = &nodes[childIndex];
+ child->offset = offset1;
+ child->type = type;
+
+ child = &nodes[childIndex + 1];
+ child->offset = offset2;
+ child->type = type;
+
+ initialize(rect1, depth - 1, childIndex);
+ initialize(rect2, depth - 1, childIndex + 1);
+ } else {
+ node->type = Node::Leaf;
+ node->leafIndex = leafCnt++;
+ }
+}
+
+void QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor *visitor, const QRectF &rect, int index) const
+{
+ if (nodes.isEmpty())
+ return;
+
+ const Node &node = nodes.at(index);
+ const int childIndex = firstChildIndex(index);
+
+ switch (node.type) {
+ case Node::Leaf: {
+ visitor->visit(const_cast<QList<QGraphicsItem*>*>(&leaves[node.leafIndex]));
+ break;
+ }
+ case Node::Vertical:
+ if (rect.left() < node.offset) {
+ climbTree(visitor, rect, childIndex);
+ if (rect.right() >= node.offset)
+ climbTree(visitor, rect, childIndex + 1);
+ } else {
+ climbTree(visitor, rect, childIndex + 1);
+ }
+ break;
+ case Node::Horizontal:
+ if (rect.top() < node.offset) {
+ climbTree(visitor, rect, childIndex);
+ if (rect.bottom() >= node.offset)
+ climbTree(visitor, rect, childIndex + 1);
+ } else {
+ climbTree(visitor, rect, childIndex + 1);
+ }
+ }
+}
+
+QRectF QGraphicsSceneBspTree::rectForIndex(int index) const
+{
+ if (index <= 0)
+ return rect;
+
+ int parentIdx = parentIndex(index);
+ QRectF rect = rectForIndex(parentIdx);
+ const Node *parent = &nodes.at(parentIdx);
+
+ if (parent->type == Node::Horizontal) {
+ if (index & 1)
+ rect.setRight(parent->offset);
+ else
+ rect.setLeft(parent->offset);
+ } else {
+ if (index & 1)
+ rect.setBottom(parent->offset);
+ else
+ rect.setTop(parent->offset);
+ }
+
+ return rect;
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GRAPHICSVIEW
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