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 #define WIDTHDIFF       1
  11
  12 static FT_Library library;
  13 static FT_Face face;
  14 static int rows, cols;
  15
  16 void font_init(void)
  17 {
  18         FT_Init_FreeType(&library);
  19         FT_New_Face(library, FONTFACE, 0, &face);
  20         FT_Set_Char_Size(face, 0, FONTSIZE << 6, DPI, DPI);
  21         rows = face->size->metrics.height >> 6;
  22         cols = (face->size->metrics.max_advance >> 6) + WIDTHDIFF;
  23 }
  24
  25 unsigned char *font_bitmap(int c, int bold)
  26 {
  27         static unsigned char bits[MAXDOTS];
  28         int sr, sc, er, ec;
  29         int i;
  30         if (FT_Load_Char(face, c, FT_LOAD_RENDER))
  31                 return NULL;
  32         if (bold) {
  33                 int FT_GlyphSlot_Own_Bitmap(FT_GlyphSlot);
  34                 FT_GlyphSlot_Own_Bitmap(face->glyph);
  35                 FT_Bitmap_Embolden(library, &face->glyph->bitmap, 32, 32);
  36         }
  37         sr = rows + (face->size->metrics.descender >> 6) -
  38                 (face->glyph->metrics.horiBearingY >> 6);
  39         sc = face->glyph->metrics.horiBearingX >> 6;
  40         er = MIN(rows, sr + face->glyph->bitmap.rows);
  41         ec = MIN(cols, sc + face->glyph->bitmap.width);
  42         memset(bits, 0, sr * cols);
  43         for (i = sr; i < er; i++) {
  44                 unsigned char *rowaddr = face->glyph->bitmap.buffer +
  45                                         (i - sr) * face->glyph->bitmap.pitch;
  46                 memset(&bits[i * cols], 0, sc);
  47                 memcpy(&bits[i * cols + sc], rowaddr, ec - sc);
  48                 memset(&bits[i * cols + ec], 0, cols - ec);
  49         }
  50         memset(&bits[er * cols], 0, (rows - er) * cols);
  51         return bits;
  52 }
  53
  54 void font_free(void)
  55 {
  56         FT_Done_Face(face);
  57         FT_Done_FreeType(library);
  58 }
  59
  60 int font_rows(void)
  61 {
  62         return rows;
  63 }
  64
  65 int font_cols(void)
  66 {
  67         return cols;
  68 }