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