/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkImageMapper.cxx
  Language:  C++
  Date:      $Date$
  Version:   $Revision$
  Thanks:    Thanks to Matt Turek who developed this class.

Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/

#include "vtkImageMapper.h"

#include "vtkActor2D.h"
#include "vtkImager.h"
#include "vtkViewport.h"
#include "vtkWindow.h"
#include "vtkImageData.h"
#include "vtkImagingFactory.h"

#define VTK_RINT(x) ((x > 0.0) ? (int)(x + 0.5) : (int)(x - 0.5))

vtkImageMapper::vtkImageMapper()
{
  vtkDebugMacro(<< "vtkImageMapper::vtkImageMapper" );

  this->Input = NULL;

  this->ColorWindow = 2000;
  this->ColorLevel  = 1000;

  this->DisplayExtent[0] = this->DisplayExtent[1] = 0;
  this->DisplayExtent[2] = this->DisplayExtent[3] = 0;
  this->DisplayExtent[4] = this->DisplayExtent[5] = 0;
  this->ZSlice = 0;

  this->RenderToRectangle = 0;
  this->UseCustomExtents  = 0;
  this->CustomDisplayExtents[0] = this->CustomDisplayExtents[1] = 0;
  this->CustomDisplayExtents[2] = this->CustomDisplayExtents[3] = 0;

}

vtkImageMapper::~vtkImageMapper()
{
  if (this->Input)
    {
    this->GetInput()->UnRegister(this);
    this->Input = NULL;
    }
}

unsigned long int vtkImageMapper::GetMTime()
{
  unsigned long mTime=this->vtkMapper2D::GetMTime();
  return mTime;
}

void vtkImageMapper::PrintSelf(ostream& os, vtkIndent indent)
{
  this->vtkMapper2D::PrintSelf(os, indent);

  os << indent << "Input: " << this->Input << "\n";
  os << indent << "Color Window: " << this->ColorWindow << "\n";
  os << indent << "Color Level: " << this->ColorLevel << "\n";
  os << indent << "ZSlice: " << this->ZSlice << "\n";
  os << indent << "RenderToRectangle: " << this->RenderToRectangle << "\n";
  os << indent << "UseCustomExtents: " << this->UseCustomExtents << "\n";
  os << indent << "CustomDisplayExtents: " <<
    this->CustomDisplayExtents[0] << " " <<
    this->CustomDisplayExtents[1] << " " <<
    this->CustomDisplayExtents[2] << " " <<
    this->CustomDisplayExtents[3] << "\n";
  //
}

vtkImageMapper* vtkImageMapper::New()
{
  // First try to create the object from the vtkObjectFactory
  vtkObject* ret = vtkImagingFactory::CreateInstance("vtkImageMapper");
  return (vtkImageMapper*)ret;
}

float vtkImageMapper::GetColorShift()
{
  return this->ColorWindow /2.0 - this->ColorLevel;
}

float vtkImageMapper::GetColorScale()
{
  return 255.0 / this->ColorWindow;
}

void vtkImageMapper::RenderStart(vtkViewport* viewport, vtkActor2D* actor)
{
  vtkDebugMacro(<< "vtkImageMapper::RenderOverlay");

  vtkImageData *data;

  if (!viewport)
    {
    vtkErrorMacro (<< "vtkImageMapper::Render - Null viewport argument");
    return;
    }

  if (!actor)
    {
    vtkErrorMacro (<<"vtkImageMapper::Render - Null actor argument");
    return;    
    }


  if (!this->Input)
    {
    vtkDebugMacro(<< "vtkImageMapper::Render - Please Set the input.");
    return;
    }

  this->GetInput()->UpdateInformation();

  if (!this->UseCustomExtents)
    {
    // start with the wholeExtent
    int wholeExtent[6];
    memcpy(wholeExtent,this->GetInput()->GetWholeExtent(),6*sizeof(int));
    memcpy(this->DisplayExtent,this->GetInput()->GetWholeExtent(),6*sizeof(int));
    // Set The z values to the zslice
    this->DisplayExtent[4] = this->ZSlice;
    this->DisplayExtent[5] = this->ZSlice;

    // scale currently not handled
    //float *scale = actor->GetScale();

    // get the position
    int *pos = actor->GetPositionCoordinate()->GetComputedViewportValue(viewport);

    // Get the viewport coordinates
    float vCoords[4];
    vCoords[0] = 0.0;
    vCoords[1] = 0.0;
    vCoords[2] = 1.0;
    vCoords[3] = 1.0;
    viewport->NormalizedViewportToViewport(vCoords[0],vCoords[1]);
    viewport->NormalizedViewportToViewport(vCoords[2],vCoords[3]);
    int *vSize = viewport->GetSize();

    // the basic formula is that the draw pos equals
    // the pos + extentPos + clippedAmount
    // The concrete subclass will get the pos in display
    // coordinates so we need to provide the extentPos plus
    // clippedAmount in the PositionAdjustment variable

    // Now clip to imager extents
    if (pos[0] + wholeExtent[0] < 0)
      {
      this->DisplayExtent[0] = -pos[0];
      }
    if ((pos[0]+wholeExtent[1]) > vSize[0])
      {
      this->DisplayExtent[1] = vSize[0] - pos[0];
      }
    if (pos[1] + wholeExtent[2] < 0)
      {
      this->DisplayExtent[2] = -pos[1];
      }
    if ((pos[1]+wholeExtent[3]) > vSize[1])
      {
      this->DisplayExtent[3] = vSize[1] - pos[1];
      }

    // check for the condition where no pixels are visible.
    if (this->DisplayExtent[0] > wholeExtent[1] ||
      this->DisplayExtent[1] < wholeExtent[0] ||
      this->DisplayExtent[2] > wholeExtent[3] ||
      this->DisplayExtent[3] < wholeExtent[2] ||
      this->DisplayExtent[4] > wholeExtent[5] ||
      this->DisplayExtent[5] < wholeExtent[4])
      {
      return;
      }

    this->GetInput()->SetUpdateExtent(this->DisplayExtent);

    // set the position adjustment
    this->PositionAdjustment[0] = this->DisplayExtent[0];
    this->PositionAdjustment[1] = this->DisplayExtent[2];
    }
  else // UseCustomExtents
    {
    this->DisplayExtent[0] = this->CustomDisplayExtents[0];
    this->DisplayExtent[1] = this->CustomDisplayExtents[1];
    this->DisplayExtent[2] = this->CustomDisplayExtents[2];
    this->DisplayExtent[3] = this->CustomDisplayExtents[3];
    this->DisplayExtent[4] = this->ZSlice;
    this->DisplayExtent[5] = this->ZSlice;
    //
    this->GetInput()->SetUpdateExtent(this->DisplayExtent);
    // clear the position adjustment
    this->PositionAdjustment[0] = 0;
    this->PositionAdjustment[1] = 0;
    }

  // Get the region from the input
  this->GetInput()->Update();
  data = this->GetInput();
  if ( !data)
    {
    vtkErrorMacro(<< "Render: Could not get data from input.");
    return;
    }

  this->RenderData(viewport, data, actor);
}

//----------------------------------------------------------------------------
int vtkImageMapper::GetWholeZMin()
{
  int *extent;
  
  if ( ! this->Input)
    {
    return 0;
    }
  this->GetInput()->UpdateInformation();
  extent = this->GetInput()->GetWholeExtent();
  return extent[4];
}

//----------------------------------------------------------------------------
int vtkImageMapper::GetWholeZMax()
{
  int *extent;
  
  if ( ! this->Input)
    {
    return 0;
    }
  this->GetInput()->UpdateInformation();
  extent = this->GetInput()->GetWholeExtent();
  return extent[5];
}


