Move Timeline and FlameGraph into a common "Tracing" library

This allows us to share code between the two, in particular the QML code
for the Details window, and the theme code. This way we can potentially
deduplicate some code.

Change-Id: I3a0d26b18488bd2a46b5b077b5b5d79ac2dfc5ce
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/tracing/timelineselectionrenderpass.cpp

@@ -0,0 +1,168 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** 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 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.
+**
+****************************************************************************/
+
+#include "timelineselectionrenderpass.h"
+#include "timelineitemsrenderpass.h"
+#include <QtMath>
+#include <QSGSimpleRectNode>
+
+namespace Timeline {
+
+QSGGeometryNode *createSelectionNode(QSGMaterial *material)
+{
+    QSGGeometryNode *selectionNode = new QSGGeometryNode;
+    selectionNode->setMaterial(material);
+    selectionNode->setFlag(QSGNode::OwnsMaterial, false);
+    QSGGeometry *geometry = new QSGGeometry(OpaqueColoredPoint2DWithSize::attributes(), 4);
+    Q_ASSERT(geometry->vertexData());
+    geometry->setDrawingMode(GL_TRIANGLE_STRIP);
+    OpaqueColoredPoint2DWithSize *v = OpaqueColoredPoint2DWithSize::fromVertexData(geometry);
+    for (int i = 0; i < 4; ++i)
+        v[i].set(0, 0, 0, 0, 0, 0, 0, 0, 0);
+    selectionNode->setGeometry(geometry);
+    selectionNode->setFlag(QSGNode::OwnsGeometry, true);
+    selectionNode->setFlag(QSGNode::OwnedByParent, false);
+    return selectionNode;
+}
+
+class TimelineSelectionRenderPassState : public TimelineRenderPass::State {
+public:
+    TimelineSelectionRenderPassState();
+    ~TimelineSelectionRenderPassState();
+
+    QSGNode *expandedOverlay() const override { return m_expandedOverlay; }
+    QSGNode *collapsedOverlay() const override { return m_collapsedOverlay; }
+    TimelineItemsMaterial *material() { return &m_material; }
+
+private:
+    QSGNode *m_expandedOverlay;
+    QSGNode *m_collapsedOverlay;
+    TimelineItemsMaterial m_material;
+};
+
+TimelineRenderPass::State *TimelineSelectionRenderPass::update(
+        const TimelineAbstractRenderer *renderer, const TimelineRenderState *parentState,
+        State *oldState, int firstIndex, int lastIndex, bool stateChanged, float spacing) const
+{
+    Q_UNUSED(stateChanged);
+
+    const TimelineModel *model = renderer->model();
+    if (!model || model->isEmpty())
+        return oldState;
+
+    TimelineSelectionRenderPassState *state;
+
+    if (oldState == 0)
+        state = new TimelineSelectionRenderPassState;
+    else
+        state = static_cast<TimelineSelectionRenderPassState *>(oldState);
+
+    int selectedItem = renderer->selectedItem();
+    QSGGeometryNode *node = static_cast<QSGGeometryNode *>(model->expanded() ?
+                                                               state->expandedOverlay() :
+                                                               state->collapsedOverlay());
+
+    if (selectedItem != -1 && selectedItem >= firstIndex && selectedItem < lastIndex) {
+        qreal top = 0;
+        qreal height = 0;
+        if (model->expanded()) {
+            int row = model->expandedRow(selectedItem);
+            int rowHeight = model->expandedRowHeight(row);
+            height = rowHeight * model->relativeHeight(selectedItem);
+            top = (model->expandedRowOffset(row) + rowHeight) - height;
+        } else {
+            int row = model->collapsedRow(selectedItem);
+            height = TimelineModel::defaultRowHeight() * model->relativeHeight(selectedItem);
+            top = TimelineModel::defaultRowHeight() * (row + 1) - height;
+        }
+
+        qint64 startTime = qBound(parentState->start(), model->startTime(selectedItem),
+                                  parentState->end());
+        qint64 endTime = qBound(parentState->start(), model->endTime(selectedItem),
+                                parentState->end());
+        qint64 left = startTime - parentState->start();
+        qint64 width = endTime - startTime;
+
+        // Construct from upper left and lower right for better precision. When constructing from
+        // left and width the error on the left border is inherited by the right border. Like this
+        // they're independent.
+
+        QRectF position(left * parentState->scale(), top, width * parentState->scale(),  height);
+
+        QColor itemColor = model->color(selectedItem);
+        uchar red = itemColor.red();
+        uchar green = itemColor.green();
+        uchar blue = itemColor.blue();
+        int selectionId = model->selectionId(selectedItem);
+
+        OpaqueColoredPoint2DWithSize *v = OpaqueColoredPoint2DWithSize::fromVertexData(
+                    node->geometry());
+        v[0].set(position.left(), position.bottom(), -position.width(), -position.height(),
+                 selectionId, red, green, blue, 255);
+        v[1].set(position.right(), position.bottom(), position.width(), -position.height(),
+                 selectionId, red, green, blue, 255);
+        v[2].set(position.left(), position.top(), -position.width(), position.height(),
+                 selectionId, red, green, blue, 255);
+        v[3].set(position.right(), position.top(), position.width(), position.height(),
+                 selectionId, red, green, blue, 255);
+        state->material()->setSelectionColor(renderer->selectionLocked() ? QColor(96,0,255) :
+                                                                           Qt::blue);
+        state->material()->setSelectedItem(selectionId);
+        state->material()->setScale(QVector2D(spacing / parentState->scale(), 1));
+        node->markDirty(QSGNode::DirtyMaterial | QSGNode::DirtyGeometry);
+    } else {
+        OpaqueColoredPoint2DWithSize *v = OpaqueColoredPoint2DWithSize::fromVertexData(
+                    node->geometry());
+        for (int i = 0; i < 4; ++i)
+            v[i].set(0, 0, 0, 0, 0, 0, 0, 0, 0);
+        node->markDirty(QSGNode::DirtyGeometry);
+    }
+    return state;
+}
+
+const TimelineSelectionRenderPass *TimelineSelectionRenderPass::instance()
+{
+    static const TimelineSelectionRenderPass pass;
+    return &pass;
+}
+
+TimelineSelectionRenderPass::TimelineSelectionRenderPass()
+{
+}
+
+TimelineSelectionRenderPassState::TimelineSelectionRenderPassState() :
+    m_expandedOverlay(0), m_collapsedOverlay(0)
+{
+    m_expandedOverlay = createSelectionNode(&m_material);
+    m_collapsedOverlay = createSelectionNode(&m_material);
+}
+
+TimelineSelectionRenderPassState::~TimelineSelectionRenderPassState()
+{
+    delete m_collapsedOverlay;
+    delete m_expandedOverlay;
+}
+
+} // namespace Timeline