Method doOperation

src/IECoreImage/ImageDiffOp.cpp:188–337

};

ObjectPtr ImageDiffOp::doOperation( const CompoundObject * operands )
{
	ImagePrimitivePtr imageA = m_imageAParameter->getTypedValue< ImagePrimitive >();
	ImagePrimitivePtr imageB = m_imageBParameter->getTypedValue< ImagePrimitive >();

	if ( imageA == imageB )
	{
		msg( Msg::Warning, "ImageDiffOp", "Exact same image specified as both input parameters.");
		return new BoolData( false );
	}

	if ( !imageA || !imageB )
	{
		throw InvalidArgumentException( "ImageDiffOp: NULL image specified as input parameter" );
	}

	assert( imageA );
	assert( imageB );

	if ( !imageA->channelsValid() || !imageB->channelsValid() )
	{
		throw InvalidArgumentException( "ImageDiffOp: Image with invalid channels specified as input parameter" );
	}

	const bool alignDisplayWindows = m_alignDisplayWindowsParameter->getTypedValue();

	if( alignDisplayWindows )
	{
		/// Fail if the display windows are of a different width or height.
		if ( ( imageA->getDisplayWindow().size().x != imageB->getDisplayWindow().size().x ) || ( imageA->getDisplayWindow().size().y != imageB->getDisplayWindow().size().y ) )
		{
			return new BoolData( true );
		}

		// If the display windows are different to each other then we move them back to the origin.
		if ( imageA->getDisplayWindow().min != imageB->getDisplayWindow().min || imageA->getDisplayWindow().min != Imath::V2i( 0 ) )
		{
			Imath::V2i offsetA = imageA->getDisplayWindow().min;
			Imath::Box2i displayWindowA( imageA->getDisplayWindow().min-offsetA, imageA->getDisplayWindow().max-offsetA );
			Imath::Box2i dataWindowA( imageA->getDataWindow().min-offsetA, imageA->getDataWindow().max-offsetA );
			imageA->setDisplayWindow( displayWindowA );
			imageA->setDataWindow( dataWindowA );

			Imath::V2i offsetB = imageB->getDisplayWindow().min;
			Imath::Box2i displayWindowB( imageB->getDisplayWindow().min-offsetB, imageB->getDisplayWindow().max-offsetB );
			Imath::Box2i dataWindowB( imageB->getDataWindow().min-offsetB, imageB->getDataWindow().max-offsetB );
			imageB->setDisplayWindow( displayWindowB );
			imageB->setDataWindow( dataWindowB );
		}
	}
	else if ( imageA->getDisplayWindow() != imageB->getDisplayWindow() )
	{
		return new BoolData( true );
	}

	/// Use the CropOp to expand the dataWindows of both images to fill the display window
	ImageCropOpPtr cropOp = new ImageCropOp();
	cropOp->matchDataWindowParameter()->setTypedValue( true );