bookr 의 TTF캐시

bkdocument
bkfancytext
fzfont

 // font 의 height 계산
 // First we go over all the characters to find the max descent
 // and ascent (space required above and below the base of a
 // line of text) and needed image size. There are simpler methods
 // to obtain these with FreeType but they are unreliable.
 int max_descent = 0, max_ascent = 0;
// 현재 라인에서 남은 공간(space)
// int space_on_line = image_width - margin, lines = 1;

 int loadMode = FT_LOAD_DEFAULT;
// if (autohint)
//  loadMode |= FT_LOAD_FORCE_AUTOHINT;
 for (int i = 0; i < 65535; ++i) {
  // Look up the character in the font file.
  int char_index = FT_Get_Char_Index(face, i);

  // 아스키 0-31까지는 제어문자로 의미가 없다.
  if (i < 32)
   char_index = 0;
 
  // Render the current glyph.
  FT_Load_Glyph(face, char_index, loadMode);
  FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
 
//  int advance = (face->glyph->metrics.horiAdvance >> 6) + margin;
//  if (advance > space_on_line) {
//   space_on_line = image_width - margin;
//   ++lines; // 라인증가 (metrics 저장을 위한 전체 메모리사이즈를 결정한다.)
//  }
//  space_on_line -= advance;

  int t = face->glyph->bitmap_top;
  if (t > max_ascent)
   max_ascent = t;
  t = face->glyph->bitmap.rows - face->glyph->bitmap_top;
  if (t > max_descent)
   max_descent = t;
 }