void QgsGlowEffect::draw( QgsRenderContext &context )
{
if ( !source() || !enabled() || !context.painter() )
return;
QImage im = sourceAsImage( context )->copy();
QgsColorRamp* ramp = nullptr;
if ( mColorType == ColorRamp && mRamp )
{
ramp = mRamp;
}
else
{
//create a temporary ramp
QColor transparentColor = mColor;
transparentColor.setAlpha( 0 );
ramp = new QgsGradientColorRamp( mColor, transparentColor );
}
QgsImageOperation::DistanceTransformProperties dtProps;
dtProps.spread = mSpread * QgsSymbolLayerUtils::pixelSizeScaleFactor( context, mSpreadUnit, mSpreadMapUnitScale );
dtProps.useMaxDistance = false;
dtProps.shadeExterior = shadeExterior();
dtProps.ramp = ramp;
QgsImageOperation::distanceTransform( im, dtProps );
if ( mBlurLevel > 0 )
{
QgsImageOperation::stackBlur( im, mBlurLevel );
}
QgsImageOperation::multiplyOpacity( im, 1.0 - mTransparency );
if ( !shadeExterior() )
{
//only keep interior portion
QPainter p( &im );
p.setRenderHint( QPainter::Antialiasing );
p.setCompositionMode( QPainter::CompositionMode_DestinationIn );
p.drawImage( 0, 0, *sourceAsImage( context ) );
p.end();
}
QPainter* painter = context.painter();
painter->save();
painter->setCompositionMode( mBlendMode );
painter->drawImage( imageOffset( context ), im );
painter->restore();
if ( !mRamp )
{
//delete temporary ramp
delete ramp;
}
}
void QgsDrawSourceEffect::draw( QgsRenderContext &context )
{
if ( !enabled() || !context.painter() )
return;
QPainter *painter = context.painter();
if ( mBlendMode == QPainter::CompositionMode_SourceOver && qgsDoubleNear( mTransparency, 0.0 ) )
{
//just draw unmodified source
drawSource( *painter );
}
else
{
//rasterize source and apply modifications
QImage image = sourceAsImage( context )->copy();
QgsImageOperation::multiplyOpacity( image, 1.0 - mTransparency );
painter->save();
painter->setCompositionMode( mBlendMode );
painter->drawImage( imageOffset( context ), image );
painter->restore();
}
}
void QgsColorEffect::draw( QgsRenderContext &context )
{
if ( !source() || !enabled() || !context.painter() )
return;
QPainter* painter = context.painter();
//rasterise source and apply modifications
QImage image = sourceAsImage( context )->copy();
QgsImageOperation::adjustBrightnessContrast( image, mBrightness, mContrast / 100.0 + 1 );
if ( mGrayscaleMode != QgsImageOperation::GrayscaleOff )
{
QgsImageOperation::convertToGrayscale( image, static_cast< QgsImageOperation::GrayscaleMode >( mGrayscaleMode ) );
}
QgsImageOperation::adjustHueSaturation( image, mSaturation, mColorizeOn ? mColorizeColor : QColor(), mColorizeStrength / 100.0 );
QgsImageOperation::multiplyOpacity( image, 1.0 - mTransparency );
painter->save();
painter->setCompositionMode( mBlendMode );
painter->drawImage( imageOffset( context ), image );
painter->restore();
}
void QgsBlurEffect::drawGaussianBlur( QgsRenderContext &context )
{
QImage *im = QgsImageOperation::gaussianBlur( *sourceAsImage( context ), mBlurLevel );
drawBlurredImage( context, *im );
delete im;
}
void QgsBlurEffect::drawStackBlur( QgsRenderContext &context )
{
QImage im = sourceAsImage( context )->copy();
QgsImageOperation::stackBlur( im, mBlurLevel );
drawBlurredImage( context, im );
}
