font.c

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