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/*
painterprofilingreplayer.cpp
This file is part of GammaRay, the Qt application inspection and manipulation tool.
SPDX-FileCopyrightText: 2017 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
Author: Volker Krause <volker.krause@kdab.com>
SPDX-License-Identifier: GPL-2.0-or-later
Contact KDAB at <info@kdab.com> for commercial licensing options.
*/
#include <config-gammaray.h>
#include "painterprofilingreplayer.h"
#include <QElapsedTimer>
#include <algorithm>
#include <memory>
using namespace GammaRay;
namespace GammaRay {
class Replayer : public QPaintEngineExReplayer
{
public:
explicit Replayer(const PaintBuffer *buffer, QPainter *p)
{
d = buffer->data();
painter = p;
}
void process(const QPaintBufferCommand &cmd) override
{
if (painter->paintEngine()->isExtended())
QPaintEngineExReplayer::process(cmd);
else
QPainterReplayer::process(cmd);
}
};
}
PainterProfilingReplayer::PainterProfilingReplayer() = default;
PainterProfilingReplayer::~PainterProfilingReplayer() = default;
void PainterProfilingReplayer::profile(const PaintBuffer &buffer)
{
const auto sourceSize = buffer.boundingRect().size().toSize();
if (sourceSize.width() <= 0 || sourceSize.height() <= 0)
return;
const auto ratio = buffer.devicePixelRatioF();
QImage image(sourceSize * ratio, QImage::Format_ARGB32); // TODO use the right format, this has considerable impact on performance!
image.setDevicePixelRatio(ratio);
image.fill(Qt::transparent);
QPainter p(&image);
Replayer replayer(&buffer, &p);
auto d = buffer.data();
const auto cmdSize = d->commands.size();
const auto runs = 5;
std::unique_ptr<double[]> samples(new double[cmdSize * runs]);
for (int run = 0; run < runs; ++run) {
for (int i = 0; i < cmdSize; ++i) {
const auto &cmd = d->commands.at(i);
QElapsedTimer t;
t.start();
replayer.process(cmd);
samples[i * runs + run] = t.nsecsElapsed();
}
}
m_costs.reserve(cmdSize);
for (int i = 0; i < cmdSize; ++i) {
std::nth_element(samples.get() + i * runs, samples.get() + i * runs + runs / 2, samples.get() + i * runs + runs);
m_costs.push_back(samples[i * runs + runs / 2]);
}
const auto sum = std::accumulate(m_costs.constBegin(), m_costs.constEnd(), 0.0);
std::for_each(m_costs.begin(), m_costs.end(), [sum](double &c) { c = 100.0 * c / sum; });
}
QVector<double> PainterProfilingReplayer::costs() const
{
return m_costs;
}
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