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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the QtDataVisualization module.
**
** Licensees holding valid Qt Enterprise licenses may use this file in
** accordance with the Qt Enterprise License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
**
****************************************************************************/
#include "qheightmapsurfacedataproxy_p.h"
QT_DATAVISUALIZATION_BEGIN_NAMESPACE
/*!
* \class QHeightMapSurfaceDataProxy
* \inmodule QtDataVisualization
* \brief Proxy class for Q3DSurface.
* \since 1.0.0
*
* QHeightMapSurfaceDataProxy takes care of surface related height map data handling. It provides a
* way for giving the surface plot a height map to be visualized.
*
* \sa QSurfaceDataProxy
*/
/*!
* \qmltype HeightMapSurfaceDataProxy
* \instantiates QHeightMapSurfaceDataProxy
* \inherits SurfaceDataProxy
*
* HeightMapSurfaceDataProxy takes care of surface related height map data handling. It provides a
* way for giving the surface plot a height map to be visualized.
*/
/*!
* \qmlproperty image HeightMapSurfaceDataProxy::heightMap
*
* A height map to be visualized. Setting this property replaces current data with height map data.
*
* There are several formats the image can be given in, but if it is not in a directly usable
* format, a conversion is made. \note If the result seems wrong, the automatic conversion failed
* and you should try converting the image yourself before setting it. Preferred format is
* QImage::Format_RGB32 in grayscale.
*
* The height of the image is read from the red component of the pixels if the image is in grayscale,
* otherwise it is an average calculated from red, green and blue components of the pixels. Using
* grayscale images may improve data conversion speed for large images.
*
* Not recommended formats: all mono formats (for example QImage::Format_Mono).
*/
/*!
* \qmlproperty string HeightMapSurfaceDataProxy::heightMapFile
*
* A file with a height map image to be visualized. Setting this property replaces current data
* with height map data.
*
* \sa heightMap
*/
/*!
* Constructs QHeightMapSurfaceDataProxy with the given \a parent.
*/
QHeightMapSurfaceDataProxy::QHeightMapSurfaceDataProxy(QObject *parent) :
QSurfaceDataProxy(new QHeightMapSurfaceDataProxyPrivate(this), parent)
{
}
/*!
* Constructs QHeightMapSurfaceDataProxy with the given \a image and \a parent. Height map is set
* by calling setHeighMap() with \a image.
*
* \sa heightMap
*/
QHeightMapSurfaceDataProxy::QHeightMapSurfaceDataProxy(const QImage &image, QObject *parent) :
QSurfaceDataProxy(new QHeightMapSurfaceDataProxyPrivate(this), parent)
{
setHeightMap(image);
}
/*!
* \internal
*/
QHeightMapSurfaceDataProxy::QHeightMapSurfaceDataProxy(
QHeightMapSurfaceDataProxyPrivate *d, QObject *parent) :
QSurfaceDataProxy(d, parent)
{
}
/*!
* Destroys QHeightMapSurfaceDataProxy.
*/
QHeightMapSurfaceDataProxy::~QHeightMapSurfaceDataProxy()
{
}
/*!
* \property QHeightMapSurfaceDataProxy::heightMap
*
* A height map to be visualized. Setting this property replaces current data with height map data.
*
* There are several formats the image can be given in, but if it is not in a directly usable
* format, a conversion is made. \note If the result seems wrong, the automatic conversion failed
* and you should try converting the image yourself before setting it. Preferred format is
* QImage::Format_RGB32 in grayscale.
*
* The height of the image is read from the red component of the pixels if the image is in grayscale,
* otherwise it is an average calculated from red, green and blue components of the pixels. Using
* grayscale images may improve data conversion speed for large images.
*
* Not recommended formats: all mono formats (for example QImage::Format_Mono).
*
* The height map is resolved asynchronously. QSurfaceDataProxy::arrayReset() is emitted when the
* data has been resolved.
*/
void QHeightMapSurfaceDataProxy::setHeightMap(const QImage &image)
{
dptr()->m_heightMap = image;
// We do resolving asynchronously to make qml onArrayReset handlers actually get the initial reset
if (!dptr()->m_resolveTimer.isActive())
dptr()->m_resolveTimer.start(0);
}
QImage QHeightMapSurfaceDataProxy::heightMap() const
{
return dptrc()->m_heightMap;
}
/*!
* \property QHeightMapSurfaceDataProxy::heightMapFile
*
* A file with a height map image to be visualized. Setting this property replaces current data
* with height map data.
*
* \sa heightMap
*/
void QHeightMapSurfaceDataProxy::setHeightMapFile(const QString &filename)
{
dptr()->m_heightMapFile = filename;
setHeightMap(QImage(filename));
}
QString QHeightMapSurfaceDataProxy::heightMapFile() const
{
return dptrc()->m_heightMapFile;
}
/*!
* \internal
*/
QHeightMapSurfaceDataProxyPrivate *QHeightMapSurfaceDataProxy::dptr()
{
return static_cast<QHeightMapSurfaceDataProxyPrivate *>(d_ptr.data());
}
/*!
* \internal
*/
const QHeightMapSurfaceDataProxyPrivate *QHeightMapSurfaceDataProxy::dptrc() const
{
return static_cast<const QHeightMapSurfaceDataProxyPrivate *>(d_ptr.data());
}
//
// QHeightMapSurfaceDataProxyPrivate
//
QHeightMapSurfaceDataProxyPrivate::QHeightMapSurfaceDataProxyPrivate(QHeightMapSurfaceDataProxy *q)
: QSurfaceDataProxyPrivate(q)
{
m_resolveTimer.setSingleShot(true);
QObject::connect(&m_resolveTimer, &QTimer::timeout,
this, &QHeightMapSurfaceDataProxyPrivate::handlePendingResolve);
}
QHeightMapSurfaceDataProxyPrivate::~QHeightMapSurfaceDataProxyPrivate()
{
}
QHeightMapSurfaceDataProxy *QHeightMapSurfaceDataProxyPrivate::qptr()
{
return static_cast<QHeightMapSurfaceDataProxy *>(q_ptr);
}
void QHeightMapSurfaceDataProxyPrivate::handlePendingResolve()
{
QImage heightImage = m_heightMap;
// Convert to RGB32 to be sure we're reading the right bytes
if (heightImage.format() != QImage::Format_RGB32)
heightImage = heightImage.convertToFormat(QImage::Format_RGB32);
uchar *bits = heightImage.bits();
int imageHeight = heightImage.height();
int imageWidth = heightImage.width();
int bitCount = imageWidth * 4 * (imageHeight - 1);
int widthBits = imageWidth * 4;
qreal height = 0;
// Do not recreate array if dimensions have not changed
QSurfaceDataArray *dataArray = m_dataArray;
if (imageWidth != qptr()->columnCount() || imageHeight != dataArray->size()) {
dataArray = new QSurfaceDataArray;
dataArray->reserve(imageHeight);
for (int i = 0; i < imageHeight; i++) {
QSurfaceDataRow *newProxyRow = new QSurfaceDataRow(imageWidth);
dataArray->append(newProxyRow);
}
}
if (heightImage.isGrayscale()) {
// Grayscale, it's enough to read Red byte
for (int i = 0; i < imageHeight; i++, bitCount -= widthBits) {
QSurfaceDataRow &newRow = *dataArray->at(i);
for (int j = 0; j < imageWidth; j++)
newRow[j] = qreal(bits[bitCount + (j * 4)]);
}
} else {
// Not grayscale, we'll need to calculate height from RGB
for (int i = 0; i < imageHeight; i++, bitCount -= widthBits) {
QSurfaceDataRow &newRow = *dataArray->at(i);
for (int j = 0; j < imageWidth; j++) {
int nextpixel = j * 4;
height = (qreal(bits[bitCount + nextpixel])
+ qreal(bits[1 + bitCount + nextpixel])
+ qreal(bits[2 + bitCount + nextpixel]));
newRow[j] = height / 3.0;
}
}
}
qptr()->resetArray(dataArray, 0.0, imageHeight, 0.0, imageWidth);
}
QT_DATAVISUALIZATION_END_NAMESPACE
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