QgsRasterBlock* QgsSingleBandColorDataRenderer::block( int bandNo, QgsRectangle const & extent, int width, int height, QgsRasterBlockFeedback* feedback )
{
Q_UNUSED( bandNo );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput )
{
return outputBlock;
}
QgsRasterBlock *inputBlock = mInput->block( mBand, extent, width, height, feedback );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
bool hasTransparency = usesTransparency();
if ( !hasTransparency )
{
// Nothing to do, just retype if necessary
inputBlock->convert( Qgis::ARGB32_Premultiplied );
delete outputBlock;
return inputBlock;
}
if ( !outputBlock->reset( Qgis::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
return outputBlock;
}
// make sure input is also premultiplied!
inputBlock->convert( Qgis::ARGB32_Premultiplied );
QRgb* inputBits = ( QRgb* )inputBlock->bits();
QRgb* outputBits = ( QRgb* )outputBlock->bits();
for ( qgssize i = 0; i < ( qgssize )width*height; i++ )
{
QRgb c = inputBits[i];
outputBits[i] = qRgba( mOpacity * qRed( c ), mOpacity * qGreen( c ), mOpacity * qBlue( c ), mOpacity * qAlpha( c ) );
}
delete inputBlock;
return outputBlock;
}
QgsRasterBlock* QgsSingleBandColorDataRenderer::block( int bandNo, QgsRectangle const & extent, int width, int height )
{
Q_UNUSED( bandNo );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput )
{
return outputBlock;
}
QgsRasterBlock *inputBlock = mInput->block( mBand, extent, width, height );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
bool hasTransparency = usesTransparency();
if ( !hasTransparency )
{
// Nothing to do, just retype if necessary
inputBlock->convert( QgsRasterBlock::ARGB32_Premultiplied );
delete outputBlock;
return inputBlock;
}
if ( !outputBlock->reset( QgsRasterBlock::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
return outputBlock;
}
for ( size_t i = 0; i < ( size_t )width*height; i++ )
{
QRgb pixelColor;
double alpha = 255.0;
QRgb c = inputBlock->color( i );
alpha = qAlpha( c );
pixelColor = qRgba( mOpacity * qRed( c ), mOpacity * qGreen( c ), mOpacity * qBlue( c ), mOpacity * alpha );
outputBlock->setColor( i, pixelColor );
}
delete inputBlock;
return outputBlock;
}
QgsRasterBlock* QgsSingleBandGrayRenderer::block( int bandNo, QgsRectangle const & extent, int width, int height )
{
Q_UNUSED( bandNo );
QgsDebugMsg( QString( "width = %1 height = %2" ).arg( width ).arg( height ) );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput )
{
return outputBlock;
}
QgsRasterBlock *inputBlock = mInput->block( mGrayBand, extent, width, height );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
QgsRasterBlock *alphaBlock = 0;
if ( mAlphaBand > 0 && mGrayBand != mAlphaBand )
{
alphaBlock = mInput->block( mAlphaBand, extent, width, height );
if ( !alphaBlock || alphaBlock->isEmpty() )
{
// TODO: better to render without alpha
delete inputBlock;
delete alphaBlock;
return outputBlock;
}
}
else if ( mAlphaBand > 0 )
{
alphaBlock = inputBlock;
}
if ( !outputBlock->reset( QGis::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
delete alphaBlock;
return outputBlock;
}
QRgb myDefaultColor = NODATA_COLOR;
for ( qgssize i = 0; i < ( qgssize )width*height; i++ )
{
if ( inputBlock->isNoData( i ) )
{
outputBlock->setColor( i, myDefaultColor );
continue;
}
double grayVal = inputBlock->value( i );
double currentAlpha = mOpacity;
if ( mRasterTransparency )
{
currentAlpha = mRasterTransparency->alphaValue( grayVal, mOpacity * 255 ) / 255.0;
}
if ( mAlphaBand > 0 )
{
currentAlpha *= alphaBlock->value( i ) / 255.0;
}
if ( mContrastEnhancement )
{
if ( !mContrastEnhancement->isValueInDisplayableRange( grayVal ) )
{
outputBlock->setColor( i, myDefaultColor );
continue;
}
grayVal = mContrastEnhancement->enhanceContrast( grayVal );
}
if ( mGradient == WhiteToBlack )
{
grayVal = 255 - grayVal;
}
if ( qgsDoubleNear( currentAlpha, 1.0 ) )
{
outputBlock->setColor( i, qRgba( grayVal, grayVal, grayVal, 255 ) );
}
else
{
outputBlock->setColor( i, qRgba( currentAlpha * grayVal, currentAlpha * grayVal, currentAlpha * grayVal, currentAlpha * 255 ) );
}
}
delete inputBlock;
if ( mAlphaBand > 0 && mGrayBand != mAlphaBand )
{
delete alphaBlock;
}
return outputBlock;
}
QgsRasterBlock *QgsHillshadeRenderer::block( int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback* feedback )
{
Q_UNUSED( bandNo );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput )
{
QgsDebugMsg( "No input raster!" );
return outputBlock;
}
QgsRasterBlock *inputBlock = mInput->block( mBand, extent, width, height, feedback );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
QgsRasterBlock *alphaBlock = nullptr;
if ( mAlphaBand > 0 && mBand != mAlphaBand )
{
alphaBlock = mInput->block( mAlphaBand, extent, width, height, feedback );
if ( !alphaBlock || alphaBlock->isEmpty() )
{
// TODO: better to render without alpha
delete inputBlock;
delete alphaBlock;
return outputBlock;
}
}
else if ( mAlphaBand > 0 )
{
alphaBlock = inputBlock;
}
if ( !outputBlock->reset( Qgis::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
delete alphaBlock;
return outputBlock;
}
double cellXSize = extent.width() / double( width );
double cellYSize = extent.height() / double( height );
double zenithRad = qMax( 0.0, 90 - mLightAngle ) * M_PI / 180.0;
double azimuthRad = -1 * mLightAzimuth * M_PI / 180.0;
double cosZenithRad = cos( zenithRad );
double sinZenithRad = sin( zenithRad );
// Multi direction hillshade: http://pubs.usgs.gov/of/1992/of92-422/of92-422.pdf
double angle0Rad = ( -1 * mLightAzimuth - 45 - 45 * 0.5 ) * M_PI / 180.0;
double angle1Rad = ( -1 * mLightAzimuth - 45 * 0.5 ) * M_PI / 180.0;
double angle2Rad = ( -1 * mLightAzimuth + 45 * 0.5 ) * M_PI / 180.0;
double angle3Rad = ( -1 * mLightAzimuth + 45 + 45 * 0.5 ) * M_PI / 180.0;
QRgb myDefaultColor = NODATA_COLOR;
for ( qgssize i = 0; i < ( qgssize )height; i++ )
{
for ( qgssize j = 0; j < ( qgssize )width; j++ )
{
if ( inputBlock->isNoData( i, j ) )
{
outputBlock->setColor( i, j, myDefaultColor );
continue;
}
qgssize iUp, iDown, jLeft, jRight;
if ( i == 0 )
{
iUp = i;
iDown = i + 1;
}
else if ( i < ( qgssize )height - 1 )
{
iUp = i - 1;
iDown = i + 1;
}
else
{
iUp = i - 1;
iDown = i;
}
if ( j == 0 )
{
jLeft = j;
jRight = j + 1;
}
else if ( j < ( qgssize )width - 1 )
{
jLeft = j - 1;
jRight = j + 1;
}
else
{
jLeft = j - 1;
jRight = j;
}
double x11;
double x21;
double x31;
double x12;
double x22; // Working cell
double x32;
double x13;
double x23;
double x33;
// This is center cell. It is not nodata. Use this in place of nodata neighbors
x22 = inputBlock->value( i, j );
x11 = inputBlock->isNoData( iUp, jLeft ) ? x22 : inputBlock->value( iUp, jLeft );
x21 = inputBlock->isNoData( i, jLeft ) ? x22 : inputBlock->value( i, jLeft );
x31 = inputBlock->isNoData( iDown, jLeft ) ? x22 : inputBlock->value( iDown, jLeft );
x12 = inputBlock->isNoData( iUp, j ) ? x22 : inputBlock->value( iUp, j );
// x22
x32 = inputBlock->isNoData( iDown, j ) ? x22 : inputBlock->value( iDown, j );
x13 = inputBlock->isNoData( iUp, jRight ) ? x22 : inputBlock->value( iUp, jRight );
x23 = inputBlock->isNoData( i, jRight ) ? x22 : inputBlock->value( i, jRight );
x33 = inputBlock->isNoData( iDown, jRight ) ? x22 : inputBlock->value( iDown, jRight );
double derX = calcFirstDerX( x11, x21, x31, x12, x22, x32, x13, x23, x33, cellXSize );
double derY = calcFirstDerY( x11, x21, x31, x12, x22, x32, x13, x23, x33, cellYSize );
double slopeRad = atan( mZFactor * sqrt( derX * derX + derY * derY ) );
double aspectRad = atan2( derX, -derY );
double grayValue;
if ( !mMultiDirectional )
{
// Standard single direction hillshade
grayValue = qBound( 0.0, 255.0 * ( cosZenithRad * cos( slopeRad )
+ sinZenithRad * sin( slopeRad )
* cos( azimuthRad - aspectRad ) ) , 255.0 );
}
else
{
// Weighted multi direction as in http://pubs.usgs.gov/of/1992/of92-422/of92-422.pdf
double weight0 = sin( aspectRad - angle0Rad );
double weight1 = sin( aspectRad - angle1Rad );
double weight2 = sin( aspectRad - angle2Rad );
double weight3 = sin( aspectRad - angle3Rad );
weight0 = weight0 * weight0;
weight1 = weight1 * weight1;
weight2 = weight2 * weight2;
weight3 = weight3 * weight3;
double cosSlope = cosZenithRad * cos( slopeRad );
double sinSlope = sinZenithRad * sin( slopeRad );
double color0 = cosSlope + sinSlope * cos( angle0Rad - aspectRad ) ;
double color1 = cosSlope + sinSlope * cos( angle1Rad - aspectRad ) ;
double color2 = cosSlope + sinSlope * cos( angle2Rad - aspectRad ) ;
double color3 = cosSlope + sinSlope * cos( angle3Rad - aspectRad ) ;
grayValue = qBound( 0.0, 255 * ( weight0 * color0 + weight1 * color1 + weight2 * color2 + weight3 * color3 ) * 0.5, 255.0 );
}
double currentAlpha = mOpacity;
if ( mRasterTransparency )
{
currentAlpha = mRasterTransparency->alphaValue( x22, mOpacity * 255 ) / 255.0;
}
if ( mAlphaBand > 0 )
{
currentAlpha *= alphaBlock->value( i ) / 255.0;
}
if ( qgsDoubleNear( currentAlpha, 1.0 ) )
{
outputBlock->setColor( i, j, qRgba( grayValue, grayValue, grayValue, 255 ) );
}
else
{
outputBlock->setColor( i, j, qRgba( currentAlpha * grayValue, currentAlpha * grayValue, currentAlpha * grayValue, currentAlpha * 255 ) );
}
}
}
delete inputBlock;
if ( mAlphaBand > 0 && mBand != mAlphaBand )
{
delete alphaBlock;
}
return outputBlock;
}
QgsRasterBlock* QgsSingleBandPseudoColorRenderer::block( int bandNo, QgsRectangle const & extent, int width, int height, QgsRasterBlockFeedback* feedback )
{
Q_UNUSED( bandNo );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput || !mShader )
{
return outputBlock;
}
QgsRasterBlock *inputBlock = mInput->block( mBand, extent, width, height, feedback );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
//rendering is faster without considering user-defined transparency
bool hasTransparency = usesTransparency();
QgsRasterBlock *alphaBlock = nullptr;
if ( mAlphaBand > 0 && mAlphaBand != mBand )
{
alphaBlock = mInput->block( mAlphaBand, extent, width, height, feedback );
if ( !alphaBlock || alphaBlock->isEmpty() )
{
delete inputBlock;
delete alphaBlock;
return outputBlock;
}
}
else if ( mAlphaBand == mBand )
{
alphaBlock = inputBlock;
}
if ( !outputBlock->reset( Qgis::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
delete alphaBlock;
return outputBlock;
}
QRgb myDefaultColor = NODATA_COLOR;
for ( qgssize i = 0; i < ( qgssize )width*height; i++ )
{
if ( inputBlock->isNoData( i ) )
{
outputBlock->setColor( i, myDefaultColor );
continue;
}
double val = inputBlock->value( i );
int red, green, blue, alpha;
if ( !mShader->shade( val, &red, &green, &blue, &alpha ) )
{
outputBlock->setColor( i, myDefaultColor );
continue;
}
if ( alpha < 255 )
{
// Working with premultiplied colors, so multiply values by alpha
red *= ( alpha / 255.0 );
blue *= ( alpha / 255.0 );
green *= ( alpha / 255.0 );
}
if ( !hasTransparency )
{
outputBlock->setColor( i, qRgba( red, green, blue, alpha ) );
}
else
{
//opacity
double currentOpacity = mOpacity;
if ( mRasterTransparency )
{
currentOpacity = mRasterTransparency->alphaValue( val, mOpacity * 255 ) / 255.0;
}
if ( mAlphaBand > 0 )
{
currentOpacity *= alphaBlock->value( i ) / 255.0;
}
outputBlock->setColor( i, qRgba( currentOpacity * red, currentOpacity * green, currentOpacity * blue, currentOpacity * alpha ) );
}
}
delete inputBlock;
if ( mAlphaBand > 0 && mBand != mAlphaBand )
{
delete alphaBlock;
}
return outputBlock;
}
QgsRasterBlock* QgsRasterResampleFilter::block2( int bandNo, QgsRectangle const & extent, int width, int height, QgsRasterBlockFeedback *feedback )
{
Q_UNUSED( bandNo );
QgsDebugMsg( QString( "width = %1 height = %2 extent = %3" ).arg( width ).arg( height ).arg( extent.toString() ) );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput ) return outputBlock;
double oversampling = 1.0; // approximate global oversampling factor
if ( mZoomedInResampler || mZoomedOutResampler )
{
QgsRasterDataProvider *provider = dynamic_cast<QgsRasterDataProvider*>( mInput->srcInput() );
if ( provider && ( provider->capabilities() & QgsRasterDataProvider::Size ) )
{
double xRes = extent.width() / width;
double providerXRes = provider->extent().width() / provider->xSize();
double pixelRatio = xRes / providerXRes;
oversampling = ( pixelRatio > mMaxOversampling ) ? mMaxOversampling : pixelRatio;
QgsDebugMsg( QString( "xRes = %1 providerXRes = %2 pixelRatio = %3 oversampling = %4" ).arg( xRes ).arg( providerXRes ).arg( pixelRatio ).arg( oversampling ) );
}
else
{
// We don't know exact data source resolution (WMS) so we expect that
// server data have higher resolution (which is not always true) and use
// mMaxOversampling
oversampling = mMaxOversampling;
}
}
QgsDebugMsg( QString( "oversampling %1" ).arg( oversampling ) );
int bandNumber = 1;
// Do no oversampling if no resampler for zoomed in / zoomed out (nearest neighbour)
// We do mZoomedInResampler if oversampling == 1 (otherwise for example reprojected
// zoom in rasters are never resampled because projector limits resolution.
if ((( oversampling < 1.0 || qgsDoubleNear( oversampling, 1.0 ) ) && !mZoomedInResampler ) || ( oversampling > 1.0 && !mZoomedOutResampler ) )
{
QgsDebugMsg( "No oversampling." );
delete outputBlock;
return mInput->block2( bandNumber, extent, width, height, feedback );
}
//effective oversampling factors are different to global one because of rounding
double oversamplingX = (( double )width * oversampling ) / width;
double oversamplingY = (( double )height * oversampling ) / height;
// TODO: we must also increase the extent to get correct result on borders of parts
int resWidth = width * oversamplingX;
int resHeight = height * oversamplingY;
QgsRasterBlock *inputBlock = mInput->block2( bandNumber, extent, resWidth, resHeight, feedback );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
if ( !outputBlock->reset( QGis::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
return outputBlock;
}
//resample image
QImage img = inputBlock->image();
QImage dstImg = QImage( width, height, QImage::Format_ARGB32_Premultiplied );
if ( mZoomedInResampler && ( oversamplingX < 1.0 || qgsDoubleNear( oversampling, 1.0 ) ) )
{
QgsDebugMsg( "zoomed in resampling" );
mZoomedInResampler->resample( img, dstImg );
}
else if ( mZoomedOutResampler && oversamplingX > 1.0 )
{
QgsDebugMsg( "zoomed out resampling" );
mZoomedOutResampler->resample( img, dstImg );
}
else
{
// Should not happen
QgsDebugMsg( "Unexpected resampling" );
dstImg = img.scaled( width, height );
}
outputBlock->setImage( &dstImg );
delete inputBlock;
return outputBlock; // No resampling
}
QgsRasterBlock * QgsPalettedRasterRenderer::block( int bandNo, QgsRectangle const & extent, int width, int height )
{
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput )
{
return outputBlock;
}
QgsRasterBlock *inputBlock = mInput->block( bandNo, extent, width, height );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
double currentOpacity = mOpacity;
//rendering is faster without considering user-defined transparency
bool hasTransparency = usesTransparency();
QgsRasterBlock *alphaBlock = 0;
if ( mAlphaBand > 0 && mAlphaBand != mBand )
{
alphaBlock = mInput->block( mAlphaBand, extent, width, height );
if ( !alphaBlock || alphaBlock->isEmpty() )
{
delete inputBlock;
delete alphaBlock;
return outputBlock;
}
}
else if ( mAlphaBand == mBand )
{
alphaBlock = inputBlock;
}
if ( !outputBlock->reset( QGis::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
delete alphaBlock;
return outputBlock;
}
QRgb myDefaultColor = NODATA_COLOR;
//use direct data access instead of QgsRasterBlock::setValue
//because of performance
unsigned int* outputData = ( unsigned int* )( outputBlock->bits() );
qgssize rasterSize = ( qgssize )width * height;
for ( qgssize i = 0; i < rasterSize; ++i )
{
if ( inputBlock->isNoData( i ) )
{
outputData[i] = myDefaultColor;
continue;
}
int val = ( int ) inputBlock->value( i );
if ( !hasTransparency )
{
outputData[i] = mColors[val];
}
else
{
currentOpacity = mOpacity;
if ( mRasterTransparency )
{
currentOpacity = mRasterTransparency->alphaValue( val, mOpacity * 255 ) / 255.0;
}
if ( mAlphaBand > 0 )
{
currentOpacity *= alphaBlock->value( i ) / 255.0;
}
QColor currentColor = QColor( mColors[val] );
outputData[i] = qRgba( currentOpacity * currentColor.red(), currentOpacity * currentColor.green(), currentOpacity * currentColor.blue(), currentOpacity * 255 );
}
}
delete inputBlock;
if ( mAlphaBand > 0 && mBand != mAlphaBand )
{
delete alphaBlock;
}
return outputBlock;
}
QgsRasterBlock * QgsRasterResampleFilter::block( int bandNo, QgsRectangle const & extent, int width, int height )
{
Q_UNUSED( bandNo );
QgsDebugMsg( "Entered" );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput ) return outputBlock;
double oversampling = 1.0; // approximate global oversampling factor
if ( mZoomedInResampler || mZoomedOutResampler )
{
QgsRasterDataProvider *provider = dynamic_cast<QgsRasterDataProvider*>( mInput->srcInput() );
// Do not oversample if data source does not have fixed resolution (WMS)
if ( provider && ( provider->capabilities() & QgsRasterDataProvider::ExactResolution ) )
{
double xRes = extent.width() / width;
double providerXRes = provider->extent().width() / provider->xSize();
double pixelRatio = xRes / providerXRes;
oversampling = ( pixelRatio > mMaxOversampling ) ? mMaxOversampling : pixelRatio;
QgsDebugMsg( QString( "xRes = %1 providerXRes = %2 pixelRatio = %3 oversampling = %4" ).arg( xRes ).arg( providerXRes ).arg( pixelRatio ).arg( oversampling ) );
}
}
//set oversampling back to 1.0 if no resampler for zoomed in / zoomed out (nearest neighbour)
if (( oversampling < 1.0 && !mZoomedInResampler ) || ( oversampling > 1.0 && !mZoomedOutResampler ) )
{
oversampling = 1.0;
}
QgsDebugMsg( QString( "oversampling %1" ).arg( oversampling ) );
//effective oversampling factors are different to global one because of rounding
double oversamplingX = (( double )width * oversampling ) / width;
double oversamplingY = (( double )height * oversampling ) / height;
// TODO: we must also increase the extent to get correct result on borders of parts
int resWidth = width * oversamplingX;
int resHeight = height * oversamplingY;
// At moment we know that we read rendered image
int bandNumber = 1;
//void *rasterData = mInput->block( bandNumber, extent, resWidth, resHeight );
QgsRasterBlock *inputBlock = mInput->block( bandNumber, extent, resWidth, resHeight );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
if ( doubleNear( oversamplingX, 1.0 ) || doubleNear( oversamplingY, 1.0 ) )
{
QgsDebugMsg( "No oversampling." );
delete outputBlock;
return inputBlock;
}
if ( !outputBlock->reset( QgsRasterBlock::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
return outputBlock;
}
//resample image
QImage img = inputBlock->image();
QImage dstImg = QImage( width, height, QImage::Format_ARGB32_Premultiplied );
if ( mZoomedInResampler && oversamplingX < 1.0 )
{
QgsDebugMsg( "zoomed in resampling" );
mZoomedInResampler->resample( img, dstImg );
}
else if ( mZoomedOutResampler && oversamplingX > 1.0 )
{
QgsDebugMsg( "zoomed out resampling" );
mZoomedOutResampler->resample( img, dstImg );
}
else
{
// Should not happen
QgsDebugMsg( "Unexpected resampling" );
dstImg = img.scaled( width, height );
}
outputBlock->setImage( &dstImg );
delete inputBlock;
return outputBlock; // No resampling
}
QgsRasterBlock * QgsHueSaturationFilter::block( int bandNo, QgsRectangle const & extent, int width, int height, QgsRasterBlockFeedback* feedback )
{
Q_UNUSED( bandNo );
QgsDebugMsgLevel( QString( "width = %1 height = %2 extent = %3" ).arg( width ).arg( height ).arg( extent.toString() ), 4 );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput )
{
return outputBlock;
}
// At this moment we know that we read rendered image
int bandNumber = 1;
QgsRasterBlock *inputBlock = mInput->block( bandNumber, extent, width, height, feedback );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
if ( mSaturation == 0 && mGrayscaleMode == GrayscaleOff && !mColorizeOn )
{
QgsDebugMsgLevel( "No hue/saturation change.", 4 );
delete outputBlock;
return inputBlock;
}
if ( !outputBlock->reset( Qgis::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
return outputBlock;
}
// adjust image
QRgb myNoDataColor = qRgba( 0, 0, 0, 0 );
QRgb myRgb;
QColor myColor;
int h, s, l;
int r, g, b, alpha;
double alphaFactor = 1.0;
for ( qgssize i = 0; i < ( qgssize )width*height; i++ )
{
if ( inputBlock->color( i ) == myNoDataColor )
{
outputBlock->setColor( i, myNoDataColor );
continue;
}
myRgb = inputBlock->color( i );
myColor = QColor( myRgb );
// Alpha must be taken from QRgb, since conversion from QRgb->QColor loses alpha
alpha = qAlpha( myRgb );
if ( alpha == 0 )
{
// totally transparent, no changes required
outputBlock->setColor( i, myRgb );
continue;
}
// Get rgb for color
myColor.getRgb( &r, &g, &b );
if ( alpha != 255 )
{
// Semi-transparent pixel. We need to adjust the colors since we are using Qgis::ARGB32_Premultiplied
// and color values have been premultiplied by alpha
alphaFactor = alpha / 255.;
r /= alphaFactor;
g /= alphaFactor;
b /= alphaFactor;
myColor = QColor::fromRgb( r, g, b );
}
myColor.getHsl( &h, &s, &l );
// Changing saturation?
if (( mGrayscaleMode != GrayscaleOff ) || ( mSaturationScale != 1 ) )
{
processSaturation( r, g, b, h, s, l );
}
// Colorizing?
if ( mColorizeOn )
{
processColorization( r, g, b, h, s, l );
}
// Convert back to rgb
if ( alpha != 255 )
{
// Transparent pixel, need to premultiply color components
r *= alphaFactor;
g *= alphaFactor;
b *= alphaFactor;
}
outputBlock->setColor( i, qRgba( r, g, b, alpha ) );
}
delete inputBlock;
return outputBlock;
}
QgsRasterBlock * QgsBrightnessContrastFilter::block( int bandNo, QgsRectangle const & extent, int width, int height )
{
Q_UNUSED( bandNo );
QgsDebugMsg( QString( "width = %1 height = %2 extent = %3" ).arg( width ).arg( height ).arg( extent.toString() ) );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput )
{
return outputBlock;
}
// At this moment we know that we read rendered image
int bandNumber = 1;
QgsRasterBlock *inputBlock = mInput->block( bandNumber, extent, width, height );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
if ( mBrightness == 0 && mContrast == 0 )
{
QgsDebugMsg( "No brightness changes." );
delete outputBlock;
return inputBlock;
}
if ( !outputBlock->reset( QGis::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
return outputBlock;
}
// adjust image
QRgb myNoDataColor = qRgba( 0, 0, 0, 0 );
QRgb myColor;
int r, g, b, alpha;
double f = qPow(( mContrast + 100 ) / 100.0, 2 );
for ( qgssize i = 0; i < ( qgssize )width*height; i++ )
{
if ( inputBlock->color( i ) == myNoDataColor )
{
outputBlock->setColor( i, myNoDataColor );
continue;
}
myColor = inputBlock->color( i );
alpha = qAlpha( myColor );
r = adjustColorComponent( qRed( myColor ), alpha, mBrightness, f );
g = adjustColorComponent( qGreen( myColor ), alpha, mBrightness, f );
b = adjustColorComponent( qBlue( myColor ), alpha, mBrightness, f );
outputBlock->setColor( i, qRgba( r, g, b, alpha ) );
}
delete inputBlock;
return outputBlock;
}
QgsRasterBlock *QgsHillshadeRenderer::block( int bandNo, const QgsRectangle &extent, int width, int height )
{
Q_UNUSED( bandNo );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput )
{
QgsDebugMsg( "No input raster!" );
return outputBlock;
}
QgsRasterBlock *inputBlock = mInput->block( mBand, extent, width, height );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
if ( !outputBlock->reset( QGis::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
return outputBlock;
}
double cellXSize = extent.width() / double( width );
double cellYSize = extent.height() / double( height );
double zenithRad = qMax( 0.0, 90 - mLightAngle ) * M_PI / 180.0;
double azimuthRad = -1 * mLightAzimuth * M_PI / 180.0;
double cosZenithRad = cos( zenithRad );
double sinZenithRad = sin( zenithRad );
QRgb myDefaultColor = NODATA_COLOR;
for ( qgssize i = 0; i < ( qgssize )height; i++ )
{
for ( qgssize j = 0; j < ( qgssize )width; j++ )
{
if ( inputBlock->isNoData( i, j ) )
{
outputBlock->setColor( i, j, myDefaultColor );
continue;
}
qgssize iUp, iDown, jLeft, jRight;
if ( i == 0 )
{
iUp = i;
iDown = i + 1;
}
else if ( i < ( qgssize )height - 1 )
{
iUp = i - 1;
iDown = i + 1;
}
else
{
iUp = i - 1;
iDown = i;
}
if ( j == 0 )
{
jLeft = j;
jRight = j + 1;
}
else if ( j < ( qgssize )width - 1 )
{
jLeft = j - 1;
jRight = j + 1;
}
else
{
jLeft = j - 1;
jRight = j;
}
double x11;
double x21;
double x31;
double x12;
double x22; // Working cell
double x32;
double x13;
double x23;
double x33;
// This is center cell. It is not nodata. Use this in place of nodata neighbors
x22 = inputBlock->value( i, j );
x11 = inputBlock->isNoData( iUp, jLeft ) ? x22 : inputBlock->value( iUp, jLeft );
x21 = inputBlock->isNoData( i, jLeft ) ? x22 : inputBlock->value( i, jLeft );
x31 = inputBlock->isNoData( iDown, jLeft ) ? x22 : inputBlock->value( iDown, jLeft );
x12 = inputBlock->isNoData( iUp, j ) ? x22 : inputBlock->value( iUp, j );
// x22
x32 = inputBlock->isNoData( iDown, j ) ? x22 : inputBlock->value( iDown, j );
x13 = inputBlock->isNoData( iUp, jRight ) ? x22 : inputBlock->value( iUp, jRight );
x23 = inputBlock->isNoData( i, jRight ) ? x22 : inputBlock->value( i, jRight );
x33 = inputBlock->isNoData( iDown, jRight ) ? x22 : inputBlock->value( iDown, jRight );
double derX = calcFirstDerX( x11, x21, x31, x12, x22, x32, x13, x23, x33, cellXSize );
double derY = calcFirstDerY( x11, x21, x31, x12, x22, x32, x13, x23, x33, cellYSize );
double slope_rad = atan( mZFactor * sqrt( derX * derX + derY * derY ) );
double aspectRad = atan2( derX, -derY );
double colorvalue = qBound( 0.0, 255.0 * (( cosZenithRad * cos( slope_rad ) ) +
( sinZenithRad * sin( slope_rad ) *
cos( azimuthRad - aspectRad ) ) ), 255.0 );
outputBlock->setColor( i, j, qRgb( colorvalue, colorvalue, colorvalue ) );
}
}
return outputBlock;
}