openni_ir_image.cpp

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/*
 * Software License Agreement (BSD License)
 *
 *  Copyright (c) 2011 Willow Garage, Inc.
 *    Suat Gedikli <gedikli@willowgarage.com>
 *
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#include <openni_camera/openni_ir_image.h>
#include <sstream>
#include <limits>
#include <iostream>

using namespace std;

namespace openni_wrapper
{
void IRImage::fillRaw (unsigned width, unsigned height, unsigned short* ir_buffer, unsigned line_step) const throw (OpenNIException)
{
  if (width > ir_md_->XRes () || height > ir_md_->YRes ())
    THROW_OPENNI_EXCEPTION ("upsampling not supported: %d x %d -> %d x %d", ir_md_->XRes (), ir_md_->YRes (), width, height);

  if (ir_md_->XRes () % width != 0 || ir_md_->YRes () % height != 0)
    THROW_OPENNI_EXCEPTION ("downsampling only supported for integer scale: %d x %d -> %d x %d", ir_md_->XRes (), ir_md_->YRes (), width, height);

  if (line_step == 0)
    line_step = width * sizeof (unsigned short);

  // special case no scaling, no padding => memcopy!
  if (width == ir_md_->XRes () && height == ir_md_->YRes () && (line_step == width * sizeof (unsigned short)))
  {
    memcpy (ir_buffer, ir_md_->WritableData(), ir_md_->DataSize ());
    return;
  }
  
  // padding skip for destination image
  unsigned bufferSkip = line_step - width * sizeof (unsigned short);

  // step and padding skip for source image
  unsigned xStep = ir_md_->XRes () / width;
  unsigned ySkip = (ir_md_->YRes () / height - 1) * ir_md_->XRes ();

  unsigned irIdx = 0;

  for (unsigned yIdx = 0; yIdx < height; ++yIdx, irIdx += ySkip)
  {
    for (unsigned xIdx = 0; xIdx < width; ++xIdx, irIdx += xStep, ++ir_buffer)
      *ir_buffer = (unsigned short) (ir_md_->WritableData()[irIdx]);
    
    // if we have padding
    if (bufferSkip > 0)
    {
      char* cBuffer = reinterpret_cast<char*> (ir_buffer);
      ir_buffer = reinterpret_cast<unsigned short*> (cBuffer + bufferSkip);
    }
  }
}
} // namespace openni_wrapper