openni_image_rgb24.cpp

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#include <openni_camera/openni_image_rgb24.h>

namespace openni_wrapper
{
ImageRGB24::ImageRGB24 (boost::shared_ptr<xn::ImageMetaData> image_meta_data) throw ()
: Image (image_meta_data)
{
}

ImageRGB24::~ImageRGB24 () throw ()
{
}

void ImageRGB24::fillGrayscale (unsigned width, unsigned height, unsigned char* gray_buffer, unsigned gray_line_step) const throw (OpenNIException)
{
  if (width > image_md_->XRes () || height > image_md_->YRes ())
    THROW_OPENNI_EXCEPTION ("Up-sampling not supported. Request was %d x %d -> %d x %d.", image_md_->XRes (), image_md_->YRes (), width, height);

  if (image_md_->XRes () % width == 0 && image_md_->YRes () % height == 0)
  {
    unsigned src_step = image_md_->XRes () / width;
    unsigned src_skip = (image_md_->YRes () / height - 1) * image_md_->XRes ();
    
    if (gray_line_step == 0)
      gray_line_step = width;
    
    unsigned dst_skip = gray_line_step - width; // skip of padding values in bytes
    
    unsigned char* dst_line = gray_buffer;
    const XnRGB24Pixel* src_line = image_md_->RGB24Data();
    
    for (unsigned yIdx = 0; yIdx < height; ++yIdx, src_line += src_skip, dst_line += dst_skip)
    {
      for (unsigned xIdx = 0; xIdx < width; ++xIdx, src_line += src_step, dst_line ++)
      {
        *dst_line = (unsigned char)(((int)src_line->nRed * 299 + (int)src_line->nGreen * 587 + (int)src_line->nBlue * 114) * 0.001);
      }
    }
  }
  else
  {
    THROW_OPENNI_EXCEPTION ("Down-sampling only possible for integer scale. Request was %d x %d -> %d x %d.", image_md_->XRes (), image_md_->YRes (), width, height);
  }
}

void ImageRGB24::fillRGB (unsigned width, unsigned height, unsigned char* rgb_buffer, unsigned rgb_line_step) const throw (OpenNIException)
{
  if (width > image_md_->XRes () || height > image_md_->YRes ())
    THROW_OPENNI_EXCEPTION ("Up-sampling not supported. Request was %d x %d -> %d x %d.", image_md_->XRes (), image_md_->YRes (), width, height);

  if (width == image_md_->XRes () && height == image_md_->YRes ())
  {
    unsigned line_size = width * 3;
    if (rgb_line_step == 0 || rgb_line_step == line_size)
    {
      memcpy (rgb_buffer, image_md_->WritableData(), image_md_->DataSize());
    }
    else // line by line
    {
      unsigned char* rgb_line = rgb_buffer;
      const unsigned char* src_line = (const unsigned char*)image_md_->WritableData();
      for (unsigned yIdx = 0; yIdx < height; ++yIdx, rgb_line += rgb_line_step, src_line += line_size)
      {
        memcpy (rgb_line, src_line, line_size);
      }
    }
  }
  else if (image_md_->XRes () % width == 0 && image_md_->YRes () % height == 0) // downsamplig
  {
    unsigned src_step = image_md_->XRes () / width;
    unsigned src_skip = (image_md_->YRes () / height - 1) * image_md_->XRes ();
    
    if (rgb_line_step == 0)
      rgb_line_step = width * 3;
    
    unsigned dst_skip = rgb_line_step - width * 3; // skip of padding values in bytes
    
    XnRGB24Pixel* dst_line = (XnRGB24Pixel*)rgb_buffer;
    const XnRGB24Pixel* src_line = image_md_->RGB24Data();
    
    for (unsigned yIdx = 0; yIdx < height; ++yIdx, src_line += src_skip)
    {
      for (unsigned xIdx = 0; xIdx < width; ++xIdx, src_line += src_step, dst_line ++)
      {
        *dst_line = *src_line;
      }
      
      if (dst_skip != 0)
      {
        // use bytes to skip rather than XnRGB24Pixel's, since line_step does not need to be multiple of 3
        unsigned char* temp = (unsigned char*) dst_line;
        dst_line = (XnRGB24Pixel*) (temp + dst_skip);
      }
    }
  }
  else
  {
    THROW_OPENNI_EXCEPTION ("Down-sampling only possible for integer scale. Request was %d x %d -> %d x %d.", image_md_->XRes (), image_md_->YRes (), width, height);
  }
}

bool ImageRGB24::isResizingSupported (unsigned input_width, unsigned input_height, unsigned output_width, unsigned output_height) const
{
  return ImageRGB24::resizingSupported (input_width, input_height, output_width, output_height);
}
}