uint32_t color_pattern(uint32_t first, uint8_t row, uint8_t step, uint8_t col, uint8_t no_rectangles ){ //function to generate the next color

  uint32_t new_color;

  if(vbmit.BitsPerPixel == 8){    //if indexed
    new_color = (first + (row * no_rectangles + col) * step) % (1 << vbmit.BitsPerPixel);
  }
  else{
  //red
  uint32_t redM=((1 << vbmit.RedMaskSize)-1);
  uint32_t red=first;
  red= (red>>(vbmit.RedFieldPosition)) & redM;
  red = (red + col * step) % (1 << vbmit.RedMaskSize);
  //green
  uint32_t greenM=((1 << vbmit.GreenMaskSize)-1);
  uint32_t green=first;
  green= (green>>vbmit.GreenFieldPosition) & greenM;
  green = (green + row * step)% (1 << vbmit.GreenMaskSize);
  //blue
  uint32_t blueM=((1 << vbmit.BlueMaskSize)-1);
  uint32_t blue = first;
  blue=(blue>>vbmit.BlueFieldPosition) & blueM;
  blue = (blue + (col + row) * step) % (1 << vbmit.BlueMaskSize);
  new_color= ((red<<vbmit.RedFieldPosition) | (green<<vbmit.GreenFieldPosition) | blue );
  }
  return new_color;
}