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         if (FT_New_Face(library, FONTFACE, 0, &face))
  16                 xerror("failed to load font");
  17         FT_Set_Char_Size(face, 0, FONTSIZE << 6, DPI, DPI);
  18         rows = face->size->metrics.height >> 6;
  19         cols = (face->size->metrics.max_advance >> 6) + WIDTHDIFF;
  20 }
  21
  22 unsigned char *font_bitmap(int c)
  23 {
  24         static unsigned char bits[MAXDOTS];
  25         int sr, sc, er, ec;
  26         int i;
  27         unsigned char *src;
  28         if (FT_Load_Char(face, c, FT_LOAD_RENDER))
  29                 return NULL;
  30         sr = rows + (face->size->metrics.descender >> 6) -
  31                  face->glyph->bitmap_top;
  32         sc = face->glyph->bitmap_left;
  33         er = MIN(rows, sr + face->glyph->bitmap.rows);
  34         ec = MIN(cols, sc + face->glyph->bitmap.width);
  35         memset(bits, 0, rows * cols);
  36         src = face->glyph->bitmap.buffer - MIN(0, sc);
  37         sc = MAX(0, sc);
  38         for (i = MAX(0, sr); i < er; i++) {
  39                 int w = face->glyph->bitmap.pitch;
  40                 memcpy(&bits[i * cols + sc], src + (i - sr) * w, ec - sc);
  41         }
  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 }