git.gag.com Git - fw/altos/blob - src/draw/font-convert

   1 #!/usr/bin/nickle
   2
   3 typedef struct {
   4         int[]   bytes;
   5         int     width;
   6         int     height;
   7         int     encoding;
   8         int     location;
   9 } glyph_t;
  10
  11 typedef struct {
  12         glyph_t[...]    glyphs;
  13         int             default_char;
  14 } font_t;
  15
  16 glyph_t
  17 read_glyph(file f)
  18 {
  19         glyph_t glyph = { .encoding = -1, .bytes = (int[...]){}, .width = 0 };
  20
  21         while (!File::end(f)) {
  22                 string  l = fgets(f);
  23
  24                 string[*] tokens = String::split(l, " ");
  25                 if (dim(tokens) == 0)
  26                         continue;
  27
  28                 switch (tokens[0]) {
  29                 case "ENCODING":
  30                         glyph.encoding = atoi(tokens[1]);
  31                         break;
  32                 case "BBX":
  33                         glyph.width = atoi(tokens[1]);
  34                         glyph.height = atoi(tokens[2]);
  35                         break;
  36                 case "ENDCHAR":
  37                         return glyph;
  38                 case "BITMAP":
  39                         while (!File::end(f)) {
  40                                 string l = fgets(f);
  41                                 if (l == "ENDCHAR")
  42                                         return glyph;
  43                                 glyph.bytes[dim(glyph.bytes)] = atoi(l, 16);
  44                         }
  45                         break;
  46                 }
  47         }
  48         return glyph;
  49 }
  50
  51 font_t read_font(file f) {
  52         font_t  font = { .glyphs = {}, .default_char = -1 };
  53
  54         while (!File::end(f)) {
  55                 string l = File::fgets(f);
  56
  57                 string[*] tokens = String::split(l, " ");
  58                 if (tokens[0] == "DEFAULT_CHAR")
  59                         font.default_char = atoi(tokens[1]);
  60                 if (tokens[0] == "CHARS")
  61                         break;
  62         }
  63         while (!File::end(f)) {
  64                 glyph_t glyph = read_glyph(f);
  65                 if (glyph.encoding == -1)
  66                         break;
  67                 font.glyphs[dim(font.glyphs)] = glyph;
  68         }
  69         return font;
  70 }
  71
  72 int
  73 flip_byte(int x)
  74 {
  75         int     dest = 0;
  76
  77         for (int i = 0; i < 8; i++)
  78                 dest |= ((x >> (7 - i)) & 1) << i;
  79         return dest;
  80 }
  81
  82 void print_font(font_t font) {
  83         int     width = font.glyphs[0].width;
  84         int     height = font.glyphs[0].height;
  85         int[256] pos = { -1 ... };
  86         int[...] bytes;
  87
  88         if (false) {
  89         for (int i = 1; i < dim(font.glyphs); i++) {
  90                 if (font.glyphs[i].width != width ||
  91                    font.glyphs[i].height != height)
  92                 {
  93                         File::fprintf(stderr, "font not constant size, glyph %d is %dx%d\n",
  94                                       font.glyphs[i].encoding, font.glyphs[i].width, font.glyphs[i].height);
  95                         exit(1);
  96                 }
  97         }
  98         }
  99
 100         if (font.default_char == -1)
 101                 font.default_char = font.glyphs[0].encoding;
 102
 103         /* build byte array */
 104         for (int i = 0; i < dim(font.glyphs); i++) {
 105                 pos[font.glyphs[i].encoding] = dim(bytes);
 106                 for (int b = 0; b < dim(font.glyphs[i].bytes); b++)
 107                         bytes[dim(bytes)] = font.glyphs[i].bytes[b];
 108         }
 109
 110         /* Fill in default glyph */
 111         for (int i = 0; i < dim(pos); i++)
 112                 if (pos[i] == -1)
 113                         pos[i] = pos[font.default_char];
 114
 115         printf("static uint8_t glyph_bytes[] = {");
 116         for (int b = 0; b < dim(bytes); b++) {
 117                 if ((b & 15) == 0)
 118                         printf("\n\t");
 119                 printf("0x%02x, ", flip_byte(bytes[b]));
 120         }
 121         printf("\n};\n\n");
 122
 123         printf("static uint16_t glyph_pos[] = {");
 124         for (int i = 0; i < dim(pos); i++) {
 125                 if ((i & 7) == 0)
 126                         printf("\n\t");
 127                 printf("%4d, ", pos[i]);
 128         }
 129         printf("\n};\n\n");
 130
 131         printf("#define GLYPH_WIDTH %d\n", width);
 132         printf("#define GLYPH_HEIGHT %d\n", height);
 133 }
 134
 135 twixt (file f = File::open(argv[1], "r"); File::close(f)) {
 136        font_t font = read_font(f);
 137        print_font(font);
 138 }