Function grfont_LoadTemplate

grtext/grfont.cpp:455–525

loads a font template

// loads a font template
bool grfont_LoadTemplate(const char *fname, tFontTemplate *ft) {
  FONTFILE ff;
  char fontname[32];
  int16_t ft_width, ft_height, ft_flags, ft_minasc, ft_maxasc, num_char, i;
  tFontFileInfo2 ffi2;

  //	open file.
  ff = OPEN_FONT(fname);
  if (!ff) {
    Error("Unable to open font %s.\n", fname);
  } else if (ff == (FONTFILE)0xffffffff) {
    Error("Illegal font file: %s.\n", fname);
  }

  //	read header information
  ft_width = READ_FONT_SHORT(ff);
  ft_height = READ_FONT_SHORT(ff);
  ft_flags = READ_FONT_SHORT(ff);
  READ_FONT_SHORT(ff); // skip baseline value (HACKED FOR BRIGHTNESS)
  ft_minasc = READ_FONT_BYTE(ff);
  ft_maxasc = READ_FONT_BYTE(ff);
  READ_FONT_DATA(ff, fontname, 32, 1); // read namae

  // read ffi2 font info
  if (ft_flags & FT_FFI2) {
    ffi2.tracking = READ_FONT_SHORT(ff);
    READ_FONT_DATA(ff, &ffi2.reserved, sizeof(ffi2.reserved), 1);
  }

  num_char = ft_maxasc - ft_minasc + 1;

  //	Read in all widths
  if (ft_flags & FT_PROPORTIONAL) {
    ft->ch_widths = (uint8_t *)mem_malloc(num_char);
    for (i = 0; i < num_char; i++)
      ft->ch_widths[i] = (uint8_t)READ_FONT_SHORT(ff);
  } else {
    ft->ch_widths = nullptr;
  }

  if (ft_flags & FT_KERNED) {
    int n_pairs = (int)READ_FONT_SHORT(ff);
    ft->kern_data = (uint8_t *)mem_malloc(sizeof(uint8_t) * 3 * (n_pairs + 1));
    for (i = 0; i < n_pairs; i++) {
      ft->kern_data[i * 3] = READ_FONT_BYTE(ff);
      ft->kern_data[i * 3 + 1] = READ_FONT_BYTE(ff);
      ft->kern_data[i * 3 + 2] = READ_FONT_BYTE(ff);
    }
    ft->kern_data[i * 3] = 255;
    ft->kern_data[i * 3 + 1] = 255;
    ft->kern_data[i * 3 + 2] = 0;
  } else {
    ft->kern_data = NULL;
  }

  ft->ch_height = (uint8_t)ft_height;
  ft->ch_maxwidth = (uint8_t)ft_width;
  ft->max_ascii = ft_maxasc;