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         if (FT_Load_Char(face, c, FT_LOAD_RENDER))
  28                 return NULL;
  29         sr = MAX(0, rows + (face->size->metrics.descender >> 6) -
  30                  (face->glyph->metrics.horiBearingY >> 6));
  31         sc = MAX(0, face->glyph->metrics.horiBearingX >> 6);
  32         er = MIN(rows, sr + face->glyph->bitmap.rows);
  33         ec = MIN(cols, sc + face->glyph->bitmap.width);
  34         memset(bits, 0, sr * cols);
  35         for (i = sr; i < er; i++) {
  36                 unsigned char *rowaddr = face->glyph->bitmap.buffer +
  37                                         (i - sr) * face->glyph->bitmap.pitch;
  38                 memset(&bits[i * cols], 0, sc);
  39                 memcpy(&bits[i * cols + sc], rowaddr, ec - sc);
  40                 memset(&bits[i * cols + ec], 0, cols - ec);
  41         }
  42         memset(&bits[er * cols], 0, (rows - er) * cols);
  43         return bits;
  44 }
  45
  46 void font_free(void)
  47 {
  48         FT_Done_Face(face);
  49         FT_Done_FreeType(library);
  50 }
  51
  52 int font_rows(void)
  53 {
  54         return rows;
  55 }
  56
  57 int font_cols(void)
  58 {
  59         return cols;
  60 }