diff options
author | Joerg Bornemann <joerg.bornemann@digia.com> | 2012-12-05 13:03:09 +0100 |
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committer | The Qt Project <gerrit-noreply@qt-project.org> | 2012-12-05 18:20:35 +0100 |
commit | 6b4994c265889db2058b7d5850b51ddfc5478754 (patch) | |
tree | 623e53eb8004b6b8ecdb7e2867ab489dde606fac /examples/multimediawidgets/player/histogramwidget.cpp | |
parent | 90c8ba233b77ed74012de3b5598a7617672e9d31 (diff) |
centralize and fixup example sources install targets
This follows suit with aeb036e in qtbase.
Change-Id: Ie8580d0a1f38ab9858b0e44c9f99bdc552a1752a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: hjk <qthjk@ovi.com>
Diffstat (limited to 'examples/multimediawidgets/player/histogramwidget.cpp')
-rw-r--r-- | examples/multimediawidgets/player/histogramwidget.cpp | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/examples/multimediawidgets/player/histogramwidget.cpp b/examples/multimediawidgets/player/histogramwidget.cpp new file mode 100644 index 000000000..7d4e63a58 --- /dev/null +++ b/examples/multimediawidgets/player/histogramwidget.cpp @@ -0,0 +1,154 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "histogramwidget.h" +#include <QPainter> + +HistogramWidget::HistogramWidget(QWidget *parent) + : QWidget(parent) + , m_levels(128) + , m_isBusy(false) +{ + m_processor.moveToThread(&m_processorThread); + qRegisterMetaType<QVector<qreal> >("QVector<qreal>"); + connect(&m_processor, SIGNAL(histogramReady(QVector<qreal>)), SLOT(setHistogram(QVector<qreal>))); + m_processorThread.start(QThread::LowestPriority); +} + +HistogramWidget::~HistogramWidget() +{ + m_processorThread.quit(); + m_processorThread.wait(10000); +} + +void HistogramWidget::processFrame(QVideoFrame frame) +{ + if (m_isBusy) + return; //drop frame + + m_isBusy = true; + QMetaObject::invokeMethod(&m_processor, "processFrame", + Qt::QueuedConnection, Q_ARG(QVideoFrame, frame), Q_ARG(int, m_levels)); +} + +void HistogramWidget::setHistogram(QVector<qreal> histogram) +{ + m_isBusy = false; + m_histogram = histogram; + update(); +} + +void HistogramWidget::paintEvent(QPaintEvent *event) +{ + Q_UNUSED(event); + + QPainter painter(this); + + if (m_histogram.isEmpty()) { + painter.fillRect(0, 0, width(), height(), QColor::fromRgb(0, 0, 0)); + return; + } + + qreal barWidth = width() / (qreal)m_histogram.size(); + + for (int i = 0; i < m_histogram.size(); i++) { + qreal h = m_histogram[i] * height(); + // draw level + painter.fillRect(barWidth * i, height() - h, barWidth * (i + 1), height(), Qt::red); + // clear the rest of the control + painter.fillRect(barWidth * i, 0, barWidth * (i + 1), height() - h, Qt::black); + } +} + +void FrameProcessor::processFrame(QVideoFrame frame, int levels) +{ + QVector<qreal> histogram(levels); + + do { + if (!levels) + break; + + if (!frame.map(QAbstractVideoBuffer::ReadOnly)) + break; + + if (frame.pixelFormat() == QVideoFrame::Format_YUV420P || + frame.pixelFormat() == QVideoFrame::Format_NV12) { + // Process YUV data + uchar *b = frame.bits(); + for (int y = 0; y < frame.height(); y++) { + uchar *lastPixel = b + frame.width(); + for (uchar *curPixel = b; curPixel < lastPixel; curPixel++) + histogram[(*curPixel * levels) >> 8] += 1.0; + b += frame.bytesPerLine(); + } + } else { + QImage::Format imageFormat = QVideoFrame::imageFormatFromPixelFormat(frame.pixelFormat()); + if (imageFormat != QImage::Format_Invalid) { + // Process RGB data + QImage image(frame.bits(), frame.width(), frame.height(), imageFormat); + image = image.convertToFormat(QImage::Format_RGB32); + + const QRgb* b = (const QRgb*)image.bits(); + for (int y = 0; y < image.height(); y++) { + const QRgb *lastPixel = b + frame.width(); + for (const QRgb *curPixel = b; curPixel < lastPixel; curPixel++) + histogram[(qGray(*curPixel) * levels) >> 8] += 1.0; + b = (const QRgb*)((uchar*)b + image.bytesPerLine()); + } + } + } + + // find maximum value + qreal maxValue = 0.0; + for (int i = 0; i < histogram.size(); i++) { + if (histogram[i] > maxValue) + maxValue = histogram[i]; + } + + if (maxValue > 0.0) { + for (int i = 0; i < histogram.size(); i++) + histogram[i] /= maxValue; + } + + frame.unmap(); + } while (false); + + emit histogramReady(histogram); +} |