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- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
- #include <libgen.h>
-
- /* This script converts "space-dot" fonts to binary "glyph rows". One byte for
- * each row. In a 5x7 font, each glyph thus use 7 bytes.
- * Resulting bytes are aligned to the **left** of the byte. Therefore, for
- * a 5-bit wide char, ". . ." translates to 0b10101000
- * Left-aligned bytes are easier to work with when compositing glyphs.
- */
-
- int main(int argc, char **argv)
- {
- if (argc != 2) {
- fprintf(stderr, "Usage: ./fontcompile fpath\n");
- return 1;
- }
- char *fn = basename(argv[1]);
- if (!fn) {
- return 1;
- }
- int w = 0;
- if ((fn[0] >= '3') && (fn[0] <= '8')) {
- w = fn[0] - '0';
- }
- int h = 0;
- if ((fn[2] >= '3') && (fn[2] <= '8')) {
- h = fn[2] - '0';
- }
- if (!w || !h || fn[1] != 'x') {
- fprintf(stderr, "Not a font filename: (3-8)x(3-8).txt.\n");
- return 1;
- }
- fprintf(stderr, "Reading a %d x %d font\n", w, h);
- FILE *fp = fopen(argv[1], "r");
- if (!fp) {
- fprintf(stderr, "Can't open %s.\n", argv[1]);
- return 1;
- }
- // We start the binary data with our first char, space, which is not in our
- // input but needs to be in our output.
- for (int i=0; i<h; i++) {
- putchar(0);
- }
- int lineno = 1;
- char buf[0x10];
- while (fgets(buf, 0x10, fp)) {
- size_t l = strlen(buf);
- if (l > w+1) { // +1 because of the newline char.
- fprintf(stderr, "Line %d too long.\n", lineno);
- fclose(fp);
- return 1;
- }
- // line can be narrower than width. It's padded with spaces.
- while (l < w+1) {
- buf[l] = ' ';
- l++;
- }
- unsigned char c = 0;
- for (int i=0; i<w; i++) {
- if (buf[i] == '.') {
- c |= (1 << (7-i));
- }
- }
- putchar(c);
- lineno++;
- }
- fclose(fp);
- return 0;
- }
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