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/*
* Trivial ASCII to C source transformation tool
* Public domain
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define H_MAX 32
#define W_MAX 32
int
main (int argc, char *argv[])
{
if (argc != 3)
{
fprintf (stderr, "Usage: %s font_height font_width < input\n", argv[0]);
exit (1);
}
char *p;
int font_height = strtol (argv[1], &p, 10);
if (*p || p == argv[1] || font_height <= 0 || font_height > H_MAX)
{
fprintf (stderr, "invalid font height\n");
exit (1);
}
int bit_width = strtol (argv[2], &p, 10);
if (*p || p == argv[2] || bit_width <= 0 || bit_width > W_MAX)
{
fprintf (stderr, "invalid font width\n");
exit (1);
}
// Width in pixels to width in bits, rounded up to bytes
bit_width = (bit_width + 7) / 8 * 8;
int c, irow = 0, icol = 0, charw = 0;
char row_data[H_MAX * W_MAX] = { 0 };
printf ("struct\n");
printf ("{\n");
printf ("\tint width;\n");
printf ("\tint advance;\n");
printf ("\tint rows[%d];\n", font_height);
printf ("}\n");
printf ("font_data[] =\n");
printf ("{\n");
while ((c = getchar ()) != EOF)
{
if (c == '\n')
{
if (irow == 0)
{
// We expect a new character definition
if (icol != 0)
{
charw = icol;
icol = 0;
irow++;
}
}
else if (irow < font_height)
{
// Just checking on consistency
if (icol != charw)
{
fprintf (stderr, "wrong line width\n");
exit (1);
}
icol = 0;
irow++;
}
else
{
// Flushing the character after a newline
if (icol != 0)
{
fprintf (stderr, "character too high\n");
exit (1);
}
// Character width, horizontal advance
printf ("\t{ %2d, %2d, { ", charw, charw + 1);
int y, x;
for (y = 0; ; )
{
unsigned bits = 0;
for (x = 0; x < charw; x++)
bits = (bits << 1) | row_data[y * W_MAX + x];
if (charw < bit_width)
bits <<= (bit_width - charw);
printf ("0x%0*x", (bit_width + 3) / 4, bits);
if (++y != font_height)
printf (", ");
else
break;
}
printf (" } },\n");
memset (row_data, 0, sizeof row_data);
icol = irow = charw = 0;
}
}
else if (c == '#')
{
// Comments
while ((c = getchar ()) != '\n' && c != EOF)
;
ungetc ('\n', stdin);
}
else
{
if (icol == W_MAX)
{
fprintf (stderr, "character too wide\n");
exit (1);
}
if (c != '0' && c != '1')
{
fprintf (stderr, "invalid input '%c'\n", c);
exit (1);
}
row_data[irow * W_MAX + icol++] = 1 - (c - '0');
}
}
if (icol != 0)
{
fprintf (stderr, "unexpected EOF\n");
exit (1);
}
printf ("};\n");
return 0;
}
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