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