font.c

   1 #include <ft2build.h>
   2 #include FT_FREETYPE_H
   3 #include FT_BITMAP_H
   4
   5 #define FONTFACE        "/home/ali/.fonts/monaco.ttf"
   6 #define FONTSIZE        10
   7 #define DPI             192
   8 #define MAXDOTS         (1 << 10)
   9
  10 static FT_Library library;
  11 static FT_Face face;
  12 static int rows, cols;
  13
  14 void font_init(void)
  15 {
  16         FT_Init_FreeType(&library);
  17         FT_New_Face(library, FONTFACE, 0, &face);
  18         FT_Set_Char_Size(face, 0, FONTSIZE << 6, DPI, DPI);
  19         rows = face->size->metrics.height >> 6;
  20         cols = face->size->metrics.max_advance >> 6;
  21 }
  22
  23 unsigned char *font_bitmap(int c, int bold)
  24 {
  25         static unsigned char bits[MAXDOTS];
  26         int sr, sc, er, ec;
  27         int i;
  28         if (FT_Load_Char(face, c, FT_LOAD_RENDER))
  29                 return NULL;
  30         if (bold) {
  31                 int FT_GlyphSlot_Own_Bitmap(FT_GlyphSlot);
  32                 FT_GlyphSlot_Own_Bitmap(face->glyph);
  33                 FT_Bitmap_Embolden(library, &face->glyph->bitmap, 32, 32);
  34         }
  35         sr = rows + (face->size->metrics.descender >> 6) -
  36                 (face->glyph->metrics.horiBearingY >> 6);
  37         sc = face->glyph->metrics.horiBearingX >> 6;
  38         er = sr + face->glyph->bitmap.rows;
  39         ec = sc + face->glyph->bitmap.width;
  40         memset(bits, 0, sr * cols);
  41         for (i = sr; i < er; i++) {
  42                 unsigned char *rowaddr = face->glyph->bitmap.buffer +
  43                                         (i - sr) * face->glyph->bitmap.pitch;
  44                 memset(&bits[i * cols], 0, sc);
  45                 memcpy(&bits[i * cols + sc], rowaddr, ec - sc);
  46                 memset(&bits[i * cols + ec], 0, cols - ec);
  47         }
  48         memset(&bits[er * cols], 0, (rows - er) * cols);
  49         return bits;
  50 }
  51
  52 void font_free(void)
  53 {
  54 }
  55
  56 int font_rows(void)
  57 {
  58         return rows;
  59 }
  60
  61 int font_cols(void)
  62 {
  63         return cols;
  64 }