Added multiple frames to QPaintBuffer.

This lets us stream a single QPaintBuffer instead of one QPaintBuffer
per frame in the trace graphicssystem, which leads to not streaming
pixmaps / images once per frame. Performance when doing a trace is also
a lot better for painting heavy applications.

Reviewed-by: Trond

4 files changed, 74 insertions, 72 deletions

diff --git a/src/gui/painting/qpaintbuffer.cpp b/src/gui/painting/qpaintbuffer.cpp
index 7de9063..f9cb108 100644
--- a/src/gui/painting/qpaintbuffer.cpp
+++ b/src/gui/painting/qpaintbuffer.cpp
@@ -239,7 +239,7 @@ bool QPaintBuffer::isEmpty() const
 
 
 
-void QPaintBuffer::draw(QPainter *painter) const
+void QPaintBuffer::draw(QPainter *painter, int frame) const
 {
 #ifdef QPAINTBUFFER_DEBUG_DRAW
     qDebug() << "QPaintBuffer::draw() --------------------------------";
@@ -270,10 +270,10 @@ void QPaintBuffer::draw(QPainter *painter) const
                               ? (QPaintEngineEx *) painter->paintEngine() : 0;
     if (xengine) {
         QPaintEngineExReplayer player;
-        player.draw(*this, painter);
+        player.draw(*this, painter, frame);
     } else {
         QPainterReplayer player;
-        player.draw(*this, painter);
+        player.draw(*this, painter, frame);
     }
 
 #ifdef QPAINTBUFFER_DEBUG_DRAW
@@ -1035,17 +1035,31 @@ void QPainterReplayer::setupTransform(QPainter *_painter)
     painter->setTransform(m_world_matrix);
 }
 
-void QPainterReplayer::draw(const QPaintBuffer &buffer, QPainter *_painter)
+void QPainterReplayer::draw(const QPaintBuffer &buffer, QPainter *_painter, int frame)
 {
     d = buffer.d_ptr;
     setupTransform(_painter);
 
-    for (int cmdIndex=0; cmdIndex<d->commands.size(); ++cmdIndex) {
+    int frameStart = (frame == 0) ? 0 : d->frames.at(frame-1);
+    int frameEnd = (frame == d->frames.size()) ? d->commands.size() : d->frames.at(frame);
+
+    for (int cmdIndex=frameStart; cmdIndex<frameEnd; ++cmdIndex) {
         const QPaintBufferCommand &cmd = d->commands.at(cmdIndex);
         process(cmd);
     }
 }
 
+void QPaintBuffer::beginNewFrame()
+{
+    if (!d_ptr->commands.isEmpty())
+        d_ptr->frames << d_ptr->commands.size();
+}
+
+int QPaintBuffer::numFrames() const
+{
+    return d_ptr->frames.size() + 1;
+}
+
 void QPainterReplayer::process(const QPaintBufferCommand &cmd)
 {
     switch (cmd.id) {
@@ -1783,6 +1797,7 @@ QDataStream &operator<<(QDataStream &stream, const QPaintBuffer &buffer)
     stream << variants;
     stream << buffer.d_ptr->commands;
     stream << buffer.d_ptr->boundingRect;
+    stream << buffer.d_ptr->frames;
 
     return stream;
 }
@@ -1800,6 +1815,7 @@ QDataStream &operator>>(QDataStream &stream, QPaintBuffer &buffer)
     stream >> buffer.d_ptr->variants;
     stream >> buffer.d_ptr->commands;
     stream >> buffer.d_ptr->boundingRect;
+    stream >> buffer.d_ptr->frames;
 
     QVector<QVariant> &variants = buffer.d_ptr->variants;
     for (int i = 0; i < variants.size(); ++i) {
diff --git a/src/gui/painting/qpaintbuffer_p.h b/src/gui/painting/qpaintbuffer_p.h
index b360279..2cb1d7c 100644
--- a/src/gui/painting/qpaintbuffer_p.h
+++ b/src/gui/painting/qpaintbuffer_p.h
@@ -71,7 +71,10 @@ public:
 
     bool isEmpty() const;
 
-    void draw(QPainter *painter) const;
+    void beginNewFrame();
+    int numFrames() const;
+
+    void draw(QPainter *painter, int frame = 0) const;
     void setBoundingRect(const QRectF &rect);
     QRectF boundingRect() const;
 
@@ -270,6 +273,7 @@ public:
     QVector<QVariant> variants;
 
     QVector<QPaintBufferCommand> commands;
+    QList<int> frames;
 
     QPaintBufferEngine *engine;
     QRectF boundingRect;
@@ -306,7 +310,7 @@ public:
 
     void setupTransform(QPainter *painter);
     void process(const QPaintBufferCommand &cmd);
-    void draw(const QPaintBuffer &buffer, QPainter *painter);
+    void draw(const QPaintBuffer &buffer, QPainter *painter, int frame);
 
 protected:
     QPaintBufferPrivate *d;
diff --git a/src/plugins/graphicssystems/trace/qgraphicssystem_trace.cpp b/src/plugins/graphicssystems/trace/qgraphicssystem_trace.cpp
index 36a8df1..bbb6536 100644
--- a/src/plugins/graphicssystems/trace/qgraphicssystem_trace.cpp
+++ b/src/plugins/graphicssystems/trace/qgraphicssystem_trace.cpp
@@ -57,30 +57,35 @@ public:
     ~QTraceWindowSurface();
 
     QPaintDevice *paintDevice();
+    void beginPaint(const QRegion &rgn);
     void endPaint(const QRegion &rgn);
 
+    bool scroll(const QRegion &area, int dx, int dy);
+
 private:
     QPaintBuffer *buffer;
+    QList<QRegion> updates;
 
-    QFile *outputFile;
-    QDataStream *out;
-
-    int frameId;
+    qulonglong winId;
 };
 
 QTraceWindowSurface::QTraceWindowSurface(QWidget *widget)
     : QRasterWindowSurface(widget)
     , buffer(0)
-    , outputFile(0)
-    , out(0)
-    , frameId(0)
+    , winId(0)
 {
 }
 
 QTraceWindowSurface::~QTraceWindowSurface()
 {
-    delete out;
-    delete outputFile;
+    if (buffer) {
+        QFile outputFile(QString(QLatin1String("qtgraphics-%0.trace")).arg(winId));
+        if (outputFile.open(QIODevice::WriteOnly)) {
+            QDataStream out(&outputFile);
+            out << *buffer << updates;
+        }
+        delete buffer;
+    }
 }
 
 QPaintDevice *QTraceWindowSurface::paintDevice()
@@ -92,28 +97,33 @@ QPaintDevice *QTraceWindowSurface::paintDevice()
     return buffer;
 }
 
-void QTraceWindowSurface::endPaint(const QRegion &rgn)
+void QTraceWindowSurface::beginPaint(const QRegion &rgn)
 {
-    if (!out) {
-        outputFile = new QFile(QString(QLatin1String("qtgraphics-%0.trace")).arg((qulonglong)window()->winId()));
-        if (outputFile->open(QIODevice::WriteOnly))
-            out = new QDataStream(outputFile);
-    }
+    // ensure paint buffer is created
+    paintDevice();
+    buffer->beginNewFrame();
+
+    QRasterWindowSurface::beginPaint(rgn);
+}
 
+void QTraceWindowSurface::endPaint(const QRegion &rgn)
+{
     QPainter p(QRasterWindowSurface::paintDevice());
-    buffer->draw(&p);
+    buffer->draw(&p, buffer->numFrames()-1);
     p.end();
 
-    if (out) {
-        *out << frameId++;
-        *out << (qulonglong)window()->winId();
-        *out << geometry();
-        *out << rgn;
-        *out << *buffer;
-    }
+    winId = (qulonglong)window()->winId();
+
+    updates << rgn;
 
-    delete buffer;
-    buffer = 0;
+    QRasterWindowSurface::endPaint(rgn);
+}
+
+bool QTraceWindowSurface::scroll(const QRegion &, int, int)
+{
+    // TODO: scrolling should also be streamed and replayed
+    // to test scrolling performance
+    return false;
 }
 
 QTraceGraphicsSystem::QTraceGraphicsSystem()
diff --git a/tools/qttracereplay/main.cpp b/tools/qttracereplay/main.cpp
index 970531b..34508e2 100644
--- a/tools/qttracereplay/main.cpp
+++ b/tools/qttracereplay/main.cpp
@@ -45,12 +45,6 @@
 #include <private/qpaintengineex_p.h>
 #include <private/qpaintbuffer_p.h>
 
-struct Frame
-{
-    QRegion updateRegion;
-    QPaintBuffer *buffer;
-};
-
 class ReplayWidget : public QWidget
 {
     Q_OBJECT
@@ -63,7 +57,9 @@ public slots:
     void updateRect();
 
 private:
-    QList<Frame> frames;
+    QList<QRegion> updates;
+    QPaintBuffer buffer;
+
     int currentFrame;
     int currentIteration;
     QTime timer;
@@ -74,7 +70,7 @@ private:
 
 void ReplayWidget::updateRect()
 {
-    update(frames.at(currentFrame).updateRegion);
+    update(updates.at(currentFrame));
 }
 
 void ReplayWidget::paintEvent(QPaintEvent *)
@@ -83,10 +79,10 @@ void ReplayWidget::paintEvent(QPaintEvent *)
 
 //    p.setClipRegion(frames.at(currentFrame).updateRegion);
 
-    frames.at(currentFrame).buffer->draw(&p);
+    buffer.draw(&p, currentFrame);
 
     ++currentFrame;
-    if (currentFrame >= frames.size()) {
+    if (currentFrame >= buffer.numFrames()) {
         currentFrame = 0;
         ++currentIteration;
 
@@ -116,15 +112,13 @@ void ReplayWidget::paintEvent(QPaintEvent *)
                 stddev = qSqrt(stddev / iterationTimes.size());
 
                 qSort(iterationTimes.begin(), iterationTimes.end());
-                qreal median = iterationTimes.at(iterationTimes.size() / 2);
-                if ((iterationTimes.size() % 1) == 1)
-                    median = (median + iterationTimes.at(iterationTimes.size() / 2 - 1)) * 0.5;
+                uint median = iterationTimes.at(iterationTimes.size() / 2);
 
                 stddev = 100 * stddev / mean;
 
                 if (iterationTimes.size() >= 10 || stddev < 4) {
-                    printf("%s, iterations: %d, frames: %d, min(ms): %d, median(ms): %f, stddev: %f %%, max(fps): %f\n", qPrintable(filename),
-                            iterationTimes.size(), frames.size(), min, median, stddev, 1000. * frames.size() / min);
+                    printf("%s, iterations: %d, frames: %d, min(ms): %d, median(ms): %d, stddev: %f %%, max(fps): %f\n", qPrintable(filename),
+                            iterationTimes.size(), updates.size(), min, median, stddev, 1000. * updates.size() / min);
                     deleteLater();
                     return;
                 }
@@ -146,34 +140,12 @@ ReplayWidget::ReplayWidget(const QString &filename_)
     QRect bounds;
     if (file.open(QIODevice::ReadOnly)) {
         QDataStream in(&file);
-
-        while (true) {
-            int frameId;
-            in >> frameId;
-
-            if (in.status() != QDataStream::Ok)
-                break;
-
-            qulonglong windowId;
-            QRegion rgn;
-
-            in >> windowId;
-
-            Frame frame;
-            frame.buffer = new QPaintBuffer;
-
-            in >> bounds;
-
-            in >> frame.updateRegion;
-            in >> *frame.buffer;
-
-            frames << frame;
-        }
+        in >> buffer >> updates;
     }
 
-    qDebug() << "Read" << frames.size() << "frames";
+    qDebug() << "Read paint buffer with" << buffer.numFrames() << "frames";
 
-    resize(bounds.size());
+    resize(buffer.boundingRect().size().toSize());
 
     setAutoFillBackground(false);
     setAttribute(Qt::WA_NoSystemBackground);