public void png_set_sCAL(PNG_SCALE unit, double width, double height)
{
info_ptr_scal_unit = unit;
info_ptr_scal_pixel_width = width;
info_ptr_scal_pixel_height = height;
info_ptr_valid |= PNG_INFO.sCAL;
}
public PNG_INFO png_get_sCAL(ref PNG_SCALE unit, ref double width, ref double height)
{
if ((info_ptr_valid & PNG_INFO.sCAL) != PNG_INFO.sCAL)
{
return(PNG_INFO.None);
}
unit = info_ptr_scal_unit;
width = info_ptr_scal_pixel_width;
height = info_ptr_scal_pixel_height;
return(PNG_INFO.sCAL);
}
public PNG_INFO png_get_sCAL(ref PNG_SCALE unit, ref double width, ref double height)
{
if((info_ptr_valid&PNG_INFO.sCAL)!=PNG_INFO.sCAL) return PNG_INFO.None;
unit=info_ptr_scal_unit;
width=info_ptr_scal_pixel_width;
height=info_ptr_scal_pixel_height;
return PNG_INFO.sCAL;
}
public void png_set_sCAL(PNG_SCALE unit, double width, double height)
{
info_ptr_scal_unit=unit;
info_ptr_scal_pixel_width=width;
info_ptr_scal_pixel_height=height;
info_ptr_valid|=PNG_INFO.sCAL;
}
// write the sCAL chunk
void png_write_sCAL(PNG_SCALE unit, double width, double height)
{
byte[] strWidth=Encoding.ASCII.GetBytes(width.ToString("G12", nc));
byte[] strHeight=Encoding.ASCII.GetBytes(height.ToString("G12", nc));
byte[] buf=new byte[strWidth.Length+strHeight.Length+2];
buf[0]=(byte)unit;
Array.Copy(strWidth, 0, buf, 1, strWidth.Length);
buf[strWidth.Length+1]=0;
Array.Copy(strHeight, 0, buf, strWidth.Length+2, strHeight.Length);
png_write_chunk(PNG.sCAL, buf, (uint)buf.Length);
}
