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qgspalettedrasterrenderer.cpp
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qgspalettedrasterrenderer.cpp
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/***************************************************************************
qgspalettedrasterrenderer.cpp
-----------------------------
begin : December 2011
copyright : (C) 2011 by Marco Hugentobler
email : marco at sourcepole dot ch
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgspalettedrasterrenderer.h"
#include "qgsrastertransparency.h"
#include "qgsrasterviewport.h"
#include <QColor>
#include <QDomDocument>
#include <QDomElement>
#include <QImage>
QgsPalettedRasterRenderer::QgsPalettedRasterRenderer( QgsRasterDataProvider* provider, int bandNumber,
QColor* colorArray, int nColors ):
QgsRasterRenderer( provider, "paletted" ), mBandNumber( bandNumber ), mColors( colorArray ), mNColors( nColors )
{
}
QgsPalettedRasterRenderer::~QgsPalettedRasterRenderer()
{
delete[] mColors;
}
QgsRasterRenderer* QgsPalettedRasterRenderer::create( const QDomElement& elem, QgsRasterDataProvider* provider )
{
if ( elem.isNull() )
{
return 0;
}
int bandNumber = elem.attribute( "band", "-1" ).toInt();
int nColors;
QColor* colors;
QDomElement paletteElem = elem.firstChildElement( "colorPalette" );
if ( !paletteElem.isNull() )
{
QDomNodeList paletteEntries = paletteElem.elementsByTagName( "paletteEntry" );
nColors = paletteEntries.size();
colors = new QColor[ nColors ];
int value = 0;
QDomElement entryElem;
for ( int i = 0; i < nColors; ++i )
{
entryElem = paletteEntries.at( i ).toElement();
value = entryElem.attribute( "value", "0" ).toInt();
colors[value] = QColor( entryElem.attribute( "color", "#000000" ) );
}
}
QgsRasterRenderer* r = new QgsPalettedRasterRenderer( provider, bandNumber, colors, nColors );
r->readXML( elem );
return r;
}
QColor* QgsPalettedRasterRenderer::colors() const
{
if ( mNColors < 1 )
{
return 0;
}
QColor* colorArray = new QColor[ mNColors ];
for ( int i = 0; i < mNColors; ++i )
{
colorArray[i] = mColors[i];
}
return colorArray;
}
void QgsPalettedRasterRenderer::draw( QPainter* p, QgsRasterViewPort* viewPort, const QgsMapToPixel* theQgsMapToPixel )
{
if ( !p || !mProvider || !viewPort || !theQgsMapToPixel )
{
return;
}
double oversamplingX, oversamplingY;
QgsRasterDataProvider::DataType transparencyType = QgsRasterDataProvider::UnknownDataType;
if ( mAlphaBand > 0 )
{
transparencyType = ( QgsRasterDataProvider::DataType )mProvider->dataType( mAlphaBand );
}
startRasterRead( mBandNumber, viewPort, theQgsMapToPixel, oversamplingX, oversamplingY );
//Read alpha band if necessary
if ( mAlphaBand > 0 && mAlphaBand != mBandNumber )
{
startRasterRead( mAlphaBand, viewPort, theQgsMapToPixel, oversamplingX, oversamplingY );
}
//number of cols/rows in output pixels
int nCols = 0;
int nRows = 0;
//number of raster cols/rows with oversampling
int nRasterCols = 0;
int nRasterRows = 0;
//shift to top left point for the raster part
int topLeftCol = 0;
int topLeftRow = 0;
int currentRasterPos = 0;
QgsRasterDataProvider::DataType rasterType = ( QgsRasterDataProvider::DataType )mProvider->dataType( mBandNumber );
void* rasterData;
double currentOpacity = mOpacity;
//rendering is faster without considering user-defined transparency
bool hasTransparency = usesTransparency( viewPort->mSrcCRS, viewPort->mDestCRS );
void* transparencyData;
while ( readNextRasterPart( mBandNumber, oversamplingX, oversamplingY, viewPort, nCols, nRows, nRasterCols, nRasterRows,
&rasterData, topLeftCol, topLeftRow ) )
{
if ( mAlphaBand > 0 && mAlphaBand != mBandNumber )
{
readNextRasterPart( mAlphaBand, oversamplingX, oversamplingY, viewPort, nCols, nRows, nRasterCols, nRasterRows,
&transparencyData, topLeftCol, topLeftRow );
}
else if ( mAlphaBand == mBandNumber )
{
transparencyData = rasterData;
}
//create image
QImage img( nRasterCols, nRasterRows, QImage::Format_ARGB32_Premultiplied );
QRgb* imageScanLine = 0;
int val = 0;
currentRasterPos = 0;
for ( int i = 0; i < nRasterRows; ++i )
{
imageScanLine = ( QRgb* )( img.scanLine( i ) );
for ( int j = 0; j < nRasterCols; ++j )
{
val = readValue( rasterData, rasterType, currentRasterPos );
if ( !hasTransparency )
{
imageScanLine[j] = mColors[ val ].rgba();
}
else
{
currentOpacity = mOpacity;
if ( mRasterTransparency )
{
currentOpacity = mRasterTransparency->alphaValue( val, mOpacity * 255 ) / 255.0;
}
if ( mAlphaBand > 0 )
{
currentOpacity *= ( readValue( transparencyData, transparencyType, currentRasterPos ) / 255.0 );
}
QColor& currentColor = mColors[val];
if ( mInvertColor )
{
imageScanLine[j] = qRgba( currentOpacity * currentColor.blue(), currentOpacity * currentColor.green(), currentOpacity * currentColor.red(), currentOpacity * 255 );
}
else
{
imageScanLine[j] = qRgba( currentOpacity * currentColor.red(), currentOpacity * currentColor.green(), currentOpacity * currentColor.blue(), currentOpacity * 255 );
}
}
++currentRasterPos;
}
}
drawImage( p, viewPort, img, topLeftCol, topLeftRow, nCols, nRows, oversamplingX, oversamplingY );
}
//stop raster reading
stopRasterRead( mBandNumber );
if ( mAlphaBand > 0 && mAlphaBand != mBandNumber )
{
stopRasterRead( mAlphaBand );
}
}
void QgsPalettedRasterRenderer::writeXML( QDomDocument& doc, QDomElement& parentElem ) const
{
if ( parentElem.isNull() )
{
return;
}
QDomElement rasterRendererElem = doc.createElement( "rasterrenderer" );
_writeXML( doc, rasterRendererElem );
rasterRendererElem.setAttribute( "band", mBandNumber );
QDomElement colorPaletteElem = doc.createElement( "colorPalette" );
for ( int i = 0; i < mNColors; ++i )
{
QDomElement colorElem = doc.createElement( "paletteEntry" );
colorElem.setAttribute( "value", i );
colorElem.setAttribute( "color", mColors[i].name() );
colorPaletteElem.appendChild( colorElem );
}
rasterRendererElem.appendChild( colorPaletteElem );
parentElem.appendChild( rasterRendererElem );
}