font.c

   1 #include <ft2build.h>
   2 #include FT_FREETYPE_H
   3 #include FT_BITMAP_H
   4 #include "util.h"
   5
   6 #define FONTFACE        "/usr/lib/X11/fonts/TTF/DejaVuSansMono.ttf"
   7 #define FONTSIZE        10
   8 #define DPI             192
   9 #define MAXDOTS         (1 << 10)
  10
  11 static FT_Library library;
  12 static FT_Face face;
  13 static int rows, cols;
  14
  15 void font_init(void)
  16 {
  17         FT_Init_FreeType(&library);
  18         FT_New_Face(library, FONTFACE, 0, &face);
  19         FT_Set_Char_Size(face, 0, FONTSIZE << 6, DPI, DPI);
  20         rows = face->size->metrics.height >> 6;
  21         cols = face->size->metrics.max_advance >> 6;
  22 }
  23
  24 unsigned char *font_bitmap(int c, int bold)
  25 {
  26         static unsigned char bits[MAXDOTS];
  27         int sr, sc, er, ec;
  28         int i;
  29         if (FT_Load_Char(face, c, FT_LOAD_RENDER))
  30                 return NULL;
  31         if (bold) {
  32                 int FT_GlyphSlot_Own_Bitmap(FT_GlyphSlot);
  33                 FT_GlyphSlot_Own_Bitmap(face->glyph);
  34                 FT_Bitmap_Embolden(library, &face->glyph->bitmap, 32, 32);
  35         }
  36         sr = rows + (face->size->metrics.descender >> 6) -
  37                 (face->glyph->metrics.horiBearingY >> 6);
  38         sc = face->glyph->metrics.horiBearingX >> 6;
  39         er = MIN(rows, sr + face->glyph->bitmap.rows);
  40         ec = MIN(cols, sc + face->glyph->bitmap.width);
  41         memset(bits, 0, sr * cols);
  42         for (i = sr; i < er; i++) {
  43                 unsigned char *rowaddr = face->glyph->bitmap.buffer +
  44                                         (i - sr) * face->glyph->bitmap.pitch;
  45                 memset(&bits[i * cols], 0, sc);
  46                 memcpy(&bits[i * cols + sc], rowaddr, ec - sc);
  47                 memset(&bits[i * cols + ec], 0, cols - ec);
  48         }
  49         memset(&bits[er * cols], 0, (rows - er) * cols);
  50         return bits;
  51 }
  52
  53 void font_free(void)
  54 {
  55 }
  56
  57 int font_rows(void)
  58 {
  59         return rows;
  60 }
  61
  62 int font_cols(void)
  63 {
  64         return cols;
  65 }