cxViewCollectionImageWriter.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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   and/or other materials provided with the distribution.

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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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#include "cxViewCollectionImageWriter.h"

#include <QPixmap>
#include "cxPatientModelService.h"
#include <QtConcurrent>
#include <QDesktopWidget>
#include <QApplication>
#include "cxReporter.h"
#include "boost/bind.hpp"
#include <QScreen>
#include <QVBoxLayout>
#include "cxViewService.h"
//#include "cxSecondaryViewLayoutWindow.h"
#include "cxViewCollectionWidget.h"
#include "vtkRenderer.h"
#include "vtkWindowToImageFilter.h"
#include "vtkRenderWindow.h"
#include "vtkPNGWriter.h"
#include "vtkUnsignedCharArray.h"
#include <QPainter>
#include "cxVolumeHelpers.h"
#include "vtkImageImport.h"
#include <QTime>

namespace cx
{


ViewCollectionImageWriter::ViewCollectionImageWriter(ViewCollectionWidget* widget) : mWidget(widget)
{

}

vtkImageDataPtr ViewCollectionImageWriter::grab()
{
    std::vector<ViewPtr> views = mWidget->getViews();
        Eigen::Array3i target_size(mWidget->width(), mWidget->height(), 1);
        vtkImageDataPtr target = generateVtkImageData(target_size, Vector3D(1,1,1), 150, 3);

        for (unsigned i=0; i<views.size(); ++i)
        {
        vtkImageDataPtr vtkImage = this->view2vtkImageData(views[i]);
        QPoint vtkpos = this->getVtkPositionOfView(views[i]);
        this->drawImageAtPos(target, vtkImage, vtkpos);
    }

    return target;
}

QPoint ViewCollectionImageWriter::getVtkPositionOfView(ViewPtr view)
{
        QPoint qpos_ul = mWidget->getPosition(view); // UL position in qt-space of mWidget
//    CX_LOG_CHANNEL_DEBUG("CA") << "  qpos_ul " << qpos_ul.x() << " " << qpos_ul.y();
    Eigen::Array2i size_view(view->getRenderer()->GetSize());
//    CX_LOG_CHANNEL_DEBUG("CA") << "  size " << size;
    QPoint qpos_ll = qpos_ul + QPoint(0, size_view[1]-1); // LL position in qt-space of mWidget
//    CX_LOG_CHANNEL_DEBUG("CA") << "  qpos_ll " << qpos_ll.x() << " " << qpos_ll.y();
    QPoint vtkpos_ll = this->qt2vtk(qpos_ll);
//    CX_LOG_CHANNEL_DEBUG("CA") << "  vtkpos_ll " << vtkpos_ll.x() << " " << vtkpos_ll.y();
    return vtkpos_ll;
}

QPoint ViewCollectionImageWriter::qt2vtk(QPoint qpos)
{
        int H = mWidget->height();
        QPoint vtkpos(qpos.x(), H-1-qpos.y());
        return vtkpos;
}


void ViewCollectionImageWriter::drawImageAtPos(vtkImageDataPtr target, vtkImageDataPtr image, QPoint pos)
{
    unsigned char* src = reinterpret_cast<unsigned char*>(image->GetScalarPointer());
    unsigned char* dst = reinterpret_cast<unsigned char*>(target->GetScalarPointer());
    Eigen::Array3i dim_src(image->GetDimensions());
    int depth = 3;
    CX_ASSERT(target->GetNumberOfScalarComponents()==depth);
    CX_ASSERT(image->GetNumberOfScalarComponents()==depth);

    for (int y=0; y<dim_src[1]; ++y)
        {
        unsigned char* src = reinterpret_cast<unsigned char*>(image->GetScalarPointer(0,y,0));
        unsigned char* dst = reinterpret_cast<unsigned char*>(target->GetScalarPointer(pos.x(),pos.y()+y,0));
        memcpy(dst, src, dim_src[0]*depth);
    }
}

// the vtk canonical way
//vtkImageDataPtr ViewCollectionImageWriter::view2vtkImageData(ViewPtr view)
//{
//    Eigen::Array4d vp(view->getRenderer()->GetViewport());
//      vtkWindowToImageFilterPtr w2i = vtkWindowToImageFilterPtr::New();
//    w2i->ShouldRerenderOff();
//      w2i->SetInput(view->getRenderWindow());
//      w2i->SetViewport(vp.data());
//      w2i->SetReadFrontBuffer(false);
//    CX_LOG_CHANNEL_DEBUG("CA") << "   - 2";
//    w2i->Update();
//    CX_LOG_CHANNEL_DEBUG("CA") << "   - 3 -upd";
//    vtkImageDataPtr image = w2i->GetOutput();
//    return image;
//}

// alternative to vtkWindowToImageFilter, effectively reimplementing parts of that filter (for debugging speed)
vtkImageDataPtr ViewCollectionImageWriter::view2vtkImageData(ViewPtr view)
{
        vtkRenderWindowPtr renderWindow = view->getRenderWindow();
        vtkRendererPtr renderer = view->getRenderer();
    Eigen::Array4d vp(renderer->GetViewport()); // need the viewport in pixels

    Eigen::Array2i origin(renderer->GetOrigin());
    Eigen::Array2i size(renderer->GetSize());
    Eigen::Array<int,6,1> extent;
    extent[0] = 0;
    extent[1] = size[0]-1;
    extent[2] = 0;
    extent[3] = size[1]-1;
    extent[4] = 0;
    extent[5] = 0;
    int frontBuffer = false;

    unsigned char *pixels;
//    QTime qtimer = QTime::currentTime();

//    CX_LOG_CHANNEL_DEBUG("CA") << "   renderWindow->GetPixelData0";
    renderWindow->MakeCurrent();
//    CX_LOG_CHANNEL_DEBUG("CA") << "   after makecurrent";
    pixels = renderWindow->GetPixelData(origin[0], origin[1], origin[0]+size[0]-1, origin[1]+size[1]-1, frontBuffer);
//    CX_LOG_CHANNEL_DEBUG("CA") << "   renderWindow->GetPixelData2";

//    std::cout << "ViewCollectionImageWriter::view2vtkImageData qtimer ms=" << qtimer.msecsTo(QTime::currentTime()) << std::endl;

    typedef vtkSmartPointer<vtkImageImport> vtkImageImportPtr;
    vtkImageImportPtr import = vtkImageImportPtr::New();
    import->SetDataScalarTypeToUnsignedChar();
    import->SetNumberOfScalarComponents(3);
    import->SetDataExtent(extent.data());
    import->SetWholeExtent(extent.data());
    bool takeOwnership = true;
    import->SetImportVoidPointer(pixels, !takeOwnership);
    import->Update();
    return import->GetOutput();
}


QImage ViewCollectionImageWriter::vtkImageData2QImage(vtkImageDataPtr input)
{
    CX_ASSERT(input->GetNumberOfScalarComponents()==3);
    CX_ASSERT(input->GetScalarType() == VTK_UNSIGNED_CHAR);

    unsigned char* ptr = reinterpret_cast<unsigned char*>(input->GetScalarPointer());
        Eigen::Array3i dim(input->GetDimensions());

    // important: input the line length. This will not copy the buffer.
    QImage retval(ptr, dim[0], dim[1], dim[0]*3, QImage::Format_RGB888);
    // copy contents into image, then flip according to conventions vtk<->qt.
    return retval.copy().mirrored(false, true);
}


} // namespace cx