QMLProfiler: Use scene graph for painting events in timeline

By using the scene graph we can retain the geometry for events in
the timeline on the GPU and potentially speed up the rendering for
large amounts of items.

Change-Id: I2cfbb8ef4ebc7b56f1977ec1facb4f2e7f2002ee
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>

src/plugins/qmlprofiler/timelinerenderstate.cpp

@@ -0,0 +1,112 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://www.qt.io/licensing.  For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** 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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "timelinerenderstate.h"
+
+namespace QmlProfiler {
+namespace Internal {
+
+TimelineRenderState::TimelineRenderState(qint64 start, qint64 end, qreal scale, int numPasses) :
+    m_expandedRowRoot(new QSGNode), m_collapsedRowRoot(new QSGNode),
+    m_expandedOverlayRoot(new QSGNode), m_collapsedOverlayRoot(new QSGNode),
+    m_start(start), m_end(end), m_scale(scale), m_passes(numPasses)
+{
+    m_expandedRowRoot->setFlag(QSGNode::OwnedByParent, false);
+    m_collapsedRowRoot->setFlag(QSGNode::OwnedByParent, false);
+    m_expandedOverlayRoot->setFlag(QSGNode::OwnedByParent, false);
+    m_collapsedOverlayRoot->setFlag(QSGNode::OwnedByParent, false);
+}
+
+TimelineRenderState::~TimelineRenderState()
+{
+    delete m_expandedRowRoot;
+    delete m_collapsedRowRoot;
+    delete m_expandedOverlayRoot;
+    delete m_collapsedOverlayRoot;
+}
+
+qint64 TimelineRenderState::start() const
+{
+    return m_start;
+}
+
+qint64 TimelineRenderState::end() const
+{
+    return m_end;
+}
+
+qreal TimelineRenderState::scale() const
+{
+    return m_scale;
+}
+
+QSGNode *TimelineRenderState::expandedRowRoot() const
+{
+    return m_expandedRowRoot;
+}
+
+QSGNode *TimelineRenderState::collapsedRowRoot() const
+{
+    return m_collapsedRowRoot;
+}
+
+QSGNode *TimelineRenderState::expandedOverlayRoot() const
+{
+    return m_expandedOverlayRoot;
+}
+
+QSGNode *TimelineRenderState::collapsedOverlayRoot() const
+{
+    return m_collapsedOverlayRoot;
+}
+
+bool TimelineRenderState::isEmpty() const
+{
+    return m_collapsedRowRoot->childCount() == 0 && m_expandedRowRoot->childCount() == 0 &&
+            m_collapsedOverlayRoot->childCount() == 0 && m_expandedOverlayRoot->childCount() == 0;
+}
+
+TimelineRenderPass::State *TimelineRenderState::passState(int i)
+{
+    return m_passes[i];
+}
+
+const TimelineRenderPass::State *TimelineRenderState::passState(int i) const
+{
+    return m_passes[i];
+}
+
+void TimelineRenderState::setPassState(int i, TimelineRenderPass::State *state)
+{
+    m_passes[i] = state;
+}
+
+}
+}