1 files changed, 79 insertions, 0 deletions
diff --git a/tests/benchmarks/widgets/graphicsview/functional/GraphicsViewBenchmark/widgets/listitemcache.cpp b/tests/benchmarks/widgets/graphicsview/functional/GraphicsViewBenchmark/widgets/listitemcache.cpp
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index 0000000000..0e4520d0a8
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+++ b/tests/benchmarks/widgets/graphicsview/functional/GraphicsViewBenchmark/widgets/listitemcache.cpp
@@ -0,0 +1,79 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QGraphicsItem>
+#include <QPainter>
+#include <QDebug>
+#include "listitemcache.h"
+
+ListItemCache::ListItemCache()
+{
+}
+
+ListItemCache::~ListItemCache()
+{
+    QPixmapCache::remove(m_cacheKey);
+}
+
+void ListItemCache::draw(QPainter * painter)
+{
+    QRectF irect = sourceBoundingRect(Qt::LogicalCoordinates);
+    QRectF vrect = painter->clipPath().boundingRect();
+
+    if (vrect.intersects(irect)) {
+        QRectF newVisibleRect = irect.intersected(vrect);
+        QPixmap pixmap;
+
+        if (!QPixmapCache::find(m_cacheKey, &pixmap) ||
+            m_visibleRect.toRect() != newVisibleRect.toRect()) {
+            //qDebug() << "ListItemCache: caching" << m_visibleRect
+            //    << "->" << newVisibleRect;
+
+            pixmap = QPixmap(sourceBoundingRect().toRect().size());
+            pixmap.fill(Qt::transparent);
+
+            QPainter pixmapPainter(&pixmap);
+            drawSource(&pixmapPainter);
+            pixmapPainter.end();
+            m_cacheKey = QPixmapCache::insert(pixmap);
+
+            m_visibleRect = newVisibleRect;
+        }
+
+        //qDebug() << "ListItemCache: blitting" << m_visibleRect;
+        painter->drawPixmap(0, 0, pixmap);
+    }
+}
+
+void ListItemCache::sourceChanged(ChangeFlags)
+{
+    QPixmapCache::remove(m_cacheKey);
+}
+
+
+