cxVideoGraphics.cpp

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.

Copyright (c) 2008-2014, SINTEF Department of Medical Technology
All rights reserved.

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modification, are permitted provided that the following conditions are met:

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   this list of conditions and the following disclaimer.

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   may be used to endorse or promote products derived from this software 
   without specific prior written permission.

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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
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#include "cxVideoGraphics.h"

#include <vtkActor.h>
#include <vtkImageData.h>
#include <vtkPlaneSource.h>
#include <vtkTransformTextureCoords.h>
#include <vtkTextureMapToPlane.h>
#include <vtkDataSetMapper.h>
#include <vtkTexture.h>
#include <vtkProperty.h>
#include <vtkImageMask.h>
#include <vtkPointData.h>
#include <vtkMatrix4x4.h>
#include <vtkLookupTable.h>
#include <vtkImageThreshold.h>
#include <vtkImageChangeInformation.h>
#include <vtkExtractVOI.h>

#include "cxUltrasoundSectorSource.h"
#include "cxBoundingBox3D.h"

namespace cx
{

VideoGraphics::VideoGraphics()
{
        mPlaneActor = vtkActorPtr::New();
        mPlaneSource = vtkPlaneSourcePtr::New();

        mDataRedirecter = vtkImageChangeInformationPtr::New();
        mUSSource = UltrasoundSectorSourcePtr::New();

        // set a filter that map all zeros in the input to ones. This enables us to
        // use zero as a special transparency value, to be used in masking.
        mMapZeroToOne = vtkImageThresholdPtr::New();
        mMapZeroToOne->ThresholdByLower(1.0);
        mMapZeroToOne->SetInValue(1);
        mMapZeroToOne->SetReplaceIn(true);

        // set the filter that applies a mask to the stream data
        mMaskFilter = vtkImageMaskPtr::New();
        mMaskFilter->SetMaskInputData(vtkImageDataPtr());
        mMaskFilter->SetMaskedOutputValue(0.0);

        // generate texture coords for mPlaneSource
        mTextureMapToPlane = vtkTextureMapToPlanePtr::New();

        mTransformTextureCoords = vtkTransformTextureCoordsPtr::New();
        mTransformTextureCoords->SetOrigin( 0, 0.5, 0);
        mTransformTextureCoords->SetScale( 1, 1, 0);
        mTransformTextureCoords->FlipROn(); // flip around axis

        mTexture = vtkTexturePtr::New();
        mTexture->RepeatOff();

        mDataSetMapper = vtkDataSetMapperPtr::New();

        mPlaneActor->SetTexture(mTexture);
        mPlaneActor->SetMapper(mDataSetMapper);
        mPlaneActor->SetVisibility(false);
        mPlaneActor->GetProperty()->LightingOff();      // Turning off lighting to remove shadow effects (Fix for #644: 2D ultrasound in 3D scene was too dark)
//      mPlaneActor->GetProperty()->ShadingOff();
}

VideoGraphics::~VideoGraphics()
{
}

void VideoGraphics::setFlipVertical(bool on)
{
        mTransformTextureCoords->SetFlipR(on); // flip around axis
}

bool VideoGraphics::getFlipVertical()
{
        return mTransformTextureCoords->GetFlipR();
}

vtkActorPtr VideoGraphics::getActor()
{
        return mPlaneActor;
}

void VideoGraphics::setupPipeline()
{
        if (!mInputVideo)
        {
                mTexture->SetInputData(NULL);
                return;
        }

        if (mInputMask)
        {
                mTextureMapToPlane->SetInputConnection(mPlaneSource->GetOutputPort());
                mTransformTextureCoords->SetInputConnection(mTextureMapToPlane->GetOutputPort() );
                mDataSetMapper->SetInputConnection(mTransformTextureCoords->GetOutputPort() );

                mMaskFilter->SetMaskInputData(mInputMask);
                mMapZeroToOne->SetInputConnection(mDataRedirecter->GetOutputPort());
                mMaskFilter->SetInputConnection(0, mMapZeroToOne->GetOutputPort());
                mTexture->SetInputConnection(mMaskFilter->GetOutputPort());
        }
        else if (mInputSector)
        {
                mUSSource->setProbeSector(mInputSector);
                mTransformTextureCoords->SetInputConnection(mUSSource->GetOutputPort() );
                mDataSetMapper->SetInputConnection(mTransformTextureCoords->GetOutputPort() );

                mTexture->SetInputConnection(mDataRedirecter->GetOutputPort());
        }
        else
        {
                mTextureMapToPlane->SetInputConnection(mPlaneSource->GetOutputPort());
                mTransformTextureCoords->SetInputConnection(mTextureMapToPlane->GetOutputPort() );
                mDataSetMapper->SetInputConnection(mTransformTextureCoords->GetOutputPort() );

                mTexture->SetInputConnection(mDataRedirecter->GetOutputPort());
        }

        this->setLookupTable();
        mPlaneActor->SetTexture(mTexture);
        mPlaneActor->SetMapper(mDataSetMapper);
}

void VideoGraphics::setMask(vtkImageDataPtr mask)
{
        if (mInputMask==mask)
                return;
        mInputSector = NULL;
        mInputMask = mask;
        this->setupPipeline();
}

void VideoGraphics::setClip(vtkPolyDataPtr sector)
{
        if (mInputSector==sector)
                return;
        mInputMask = NULL;
        mInputSector = sector;
        this->setupPipeline();
}

void VideoGraphics::setInputVideo(vtkImageDataPtr video)
{
        if (mInputVideo==video)
                return;
        mInputVideo = video;
        this->setupPipeline();
}

void VideoGraphics::setActorUserMatrix(vtkMatrix4x4Ptr rMu)
{
        mPlaneActor->SetUserMatrix(rMu);
}

void VideoGraphics::setVisibility(bool visible)
{
        mPlaneActor->SetVisibility(visible);
        mPlaneActor->Modified();
}

void VideoGraphics::update()
{
        if (this->inputImageIsEmpty())
        {
                this->setVisibility(false);
                return;
        }

        this->connectVideoImageToPipeline();
        this->updateLUT();
        this->updatePlaneSourceBounds();

        mPlaneActor->Modified();
}

void VideoGraphics::connectVideoImageToPipeline()
{
        if (mInputVideo == NULL)
        {
                mTexture->SetInputData(NULL); // TODO trouble - will destroy the pipeline
                return;
        }

        //Check if 3D volume. If so, only use middle frame
        int* extent = mInputVideo->GetExtent();
        if(extent[5] - extent[4] > 0)
        {
                int slice = floor(extent[4]+0.5f*(extent[5]-extent[4]));
                if (slice < 0) slice = 0;
//              std::cout << "Got 3D volume, showing middle slice: " << slice << std::endl;
                vtkSmartPointer<vtkExtractVOI> extractVOI = vtkSmartPointer<vtkExtractVOI>::New();
                extractVOI->SetInputData(mInputVideo);
                extractVOI->SetVOI(extent[0], extent[1], extent[2], extent[3], slice, slice);
                extractVOI->Update();
                mDataRedirecter->SetInputConnection(extractVOI->GetOutputPort());
        }
        else //2D
        {
                mDataRedirecter->SetInputData(mInputVideo);
        }

        mDataRedirecter->UpdateWholeExtent(); // important! syncs update extent to whole extent
        mDataRedirecter->Update();
//      mDataRedirecter->GetOutput()->Update(); //???
}

void VideoGraphics::updatePlaneSourceBounds()
{
        // set the planesource where we have no probedata.
        // TODO dont do this when planesource is not part of pipeline.
        DoubleBoundingBox3D bounds(mDataRedirecter->GetOutput()->GetBounds());
        if (!similar(bounds.range()[0], 0.0) || !similar(bounds.range()[1], 0.0))
        {
                mPlaneSource->SetOrigin(bounds.corner(0,0,0).begin());
                mPlaneSource->SetPoint1(bounds.corner(1,0,0).begin());
                mPlaneSource->SetPoint2(bounds.corner(0,1,0).begin());
                mPlaneSource->GetOutput()->GetPointData()->Modified();
                mPlaneSource->GetOutput()->Modified();
        }
}

void VideoGraphics::updateLUT()
{
        this->setLookupTable();
        mTexture->SetLookupTable(mLUT);

        // apply a lut only if the input data is monochrome
        int numComp = mDataRedirecter->GetOutput()->GetNumberOfScalarComponents();
        bool is8bit = mDataRedirecter->GetOutput()->GetScalarType()==VTK_UNSIGNED_CHAR;
        if (numComp==1)
        {
                double srange[2];
                if (is8bit)
                {
                        srange[0] = 0;
                        srange[1] = 255;
                }
                else
                {
                        mDataRedirecter->GetOutput()->GetScalarRange(srange);
                }

                mTexture->GetLookupTable()->SetRange(srange[0], srange[1]);
                mTexture->MapColorScalarsThroughLookupTableOn();
        }
        else
        {
                mTexture->MapColorScalarsThroughLookupTableOff();
        }
}

void VideoGraphics::setLookupTable()
{
        // applies only to mask:
        // Create a lut of size at least equal to the data range. Set the tableRange[0] to zero.
        // This will force input zero to be mapped onto the first table value (the transparent one),
        // and inputs [1, -> > is mapped to larger values, not transparent.
        // In order to create a window-level function, manually build a table.

        //make a default system set lookuptable, grayscale...
        vtkLookupTablePtr lut = vtkLookupTablePtr::New();
        lut->SetNumberOfTableValues(1000); // large enough to give resolution even for ct images.
        //lut->SetTableRange (0, 1024); // the window of the input
        lut->SetTableRange (0, 255); // the window of the input - must be reset according to data
        lut->SetSaturationRange (0, 0);
        lut->SetHueRange (0, 0);
        lut->SetValueRange (0, 1);
        lut->SetRampToLinear();
        lut->Build();

        if (mInputMask)
        {
                lut->SetTableValue(0, 0, 0, 0, 0); // set the lowest value to transparent. This will make the masked values transparent, but nothing else
        }

        lut->Modified();
        mLUT = lut;
}

bool VideoGraphics::inputImageIsEmpty()
{
        if (mInputVideo == NULL)
                return true;
//      mInputVideo->Update();
        //Don't do anything if we get an empty image
        int* dim = mInputVideo->GetDimensions();
        if(dim[0] == 0 || dim[1] == 0)
                return true;

        return false;
}

} // namespace cx