From 2300d2813a524cbfeabac794335e7abe99263df6 Mon Sep 17 00:00:00 2001
From: "B. Watson" <yalhcru@gmail.com>
Date: Tue, 29 Dec 2015 23:10:50 -0500
Subject: initial commit

---
 convfont.c | 146 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 convfont.c

(limited to 'convfont.c')

diff --git a/convfont.c b/convfont.c
new file mode 100644
index 0000000..a2a2418
--- /dev/null
+++ b/convfont.c
@@ -0,0 +1,146 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <unistd.h>
+#include <stdio.h>
+
+/* usage:
+	# extract the 1K atari ROM font:
+	dd if=atariosb.rom of=romfont bs=256 skip=8 count=4
+
+	# extract the Apple II Taipan font:
+	dd if=taipan.dsk of=font bs=256 skip=54 count=3
+
+	# create the Atari 8-bit Taipan font:
+	cat romfont font | ./convfont > taifont.raw
+
+	# or, create the Atari 8-bit Taipan font as a binary load:
+	cat romfont font | ./convfont -x > taifont.xex
+ */
+
+/*
+	taipan font file order:
+	0-31: `a-z{|}" block
+	32-63: @A-Z[\]^_
+	64-95: space !"#$%&'()*+,-./0-9:;>=<?
+
+	atari screen code order:
+	0-31: space !"#$%&'()*+,-./0-9:;>=<?
+	32-63: @A-Z[\]^_
+	64-95 graphics chars
+	96-127: `a-z and 4 graphics chars
+*/
+
+/* custom characters for ship graphics. 1st byte
+	is screencode, the other 8 are the pixel data. */
+char shipdata[][9] = {
+	{0x02 , 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x3f},
+	{0x03 , 0x18, 0x1f, 0x1f, 0x10, 0x10, 0x10, 0xff, 0xff},
+	{0x04 , 0x00, 0xf0, 0xfc, 0x3e, 0x00, 0x00, 0xfc, 0xf0},
+	{0x06 , 0x00, 0x00, 0x40, 0x70, 0x7c, 0x47, 0x40, 0x40},
+	{0x1b , 0x1f, 0x3f, 0xff, 0x3f, 0x1f, 0x3f, 0xff, 0x7f},
+	{0x1c , 0xc0, 0xf0, 0xfc, 0xf0, 0xc0, 0xf0, 0xfc, 0xf0},
+	{0x1d , 0x07, 0x03, 0x07, 0x0f, 0x07, 0x03, 0x07, 0x0f},
+	{0x1e , 0xfe, 0xfc, 0xfe, 0xff, 0xfe, 0xf8, 0xfe, 0xff},
+	{0x20 , 0xfe, 0xf8, 0xfe, 0xff, 0xfe, 0xfe, 0xfd, 0xf9},
+	{0x3b , 0xc0, 0xfe, 0xff, 0xff, 0xff, 0xff, 0x7f, 0x1f},
+	{0x3c , 0x00, 0x00, 0xc0, 0xff, 0x8f, 0x8e, 0x8e, 0xfe},
+	{0x3d , 0x38, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38},
+	{0x3e , 0x00, 0x00, 0x00, 0x01, 0xff, 0xe3, 0xe3, 0xe3},
+	{0x3f , 0x00, 0x00, 0x00, 0xff, 0x8e, 0x8e, 0x8e, 0xff},
+	{0x40 , 0xc3, 0xcf, 0xff, 0xff, 0x3f, 0x3e, 0x3c, 0xf8},
+	{0x46 , 0x1f, 0x0f, 0x07, 0x07, 0x07, 0x03, 0x03, 0x03},
+	{0x47 , 0xf0, 0xe0, 0xc0, 0xc0, 0xc0, 0xc0, 0x80, 0x80},
+	{ 0,    0,    0,    0,    0,    0,    0,    0,    0   }
+};
+
+/* this ends up in LORCHA.DAT */
+char shipshape[] = {
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x02, 0x03, 0x04, 0x00, 0x06,
+	0x00, 0x00, 0x1b, 0x80, 0x1c, 0x1d, 0x1e,
+	0x00, 0x00, 0x1b, 0x80, 0x1c, 0x1d, 0x20,
+	0x00, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40,
+	0x00, 0x46, 0x80, 0x80, 0x80, 0x80, 0x47,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+void bitswap(unsigned char *b, int lim) {
+	unsigned char j, k;
+	// fprintf(stderr, "bitswap(%x, %d)\n", b, lim);
+	do {
+		k = b[lim];
+		j = 0;
+		j |= (k & 0x01 ? 0x80 : 0);
+		j |= (k & 0x02 ? 0x40 : 0);
+		j |= (k & 0x04 ? 0x20 : 0);
+		j |= (k & 0x08 ? 0x10 : 0);
+		j |= (k & 0x10 ? 0x08 : 0);
+		j |= (k & 0x20 ? 0x04 : 0);
+		j |= (k & 0x40 ? 0x02 : 0);
+		j |= (k & 0x80 ? 0x01 : 0);
+		b[lim] = j;
+	} while(--lim > 0);
+}
+
+void clear0bits(unsigned char *b, int lim) {
+	do {
+		*b++ &= 0xfe;
+	} while(--lim > 0);
+}
+
+int main(int argc, char **argv) {
+	int i, j;
+	unsigned char font[1024], xex[6];
+
+	read(0, font, 1024);
+	read(0, font + (96 * 8), 32 * 8);
+	bitswap(font + (96 * 8), 32 * 8);
+	read(0, font + (32 * 8), 32 * 8);
+	bitswap(font + (32 * 8), 32 * 8);
+	read(0, font + (0 * 8), 32 * 8);
+	bitswap(font + (0 * 8), 32 * 8);
+
+	/* this stuff is from visual inspection via bitmapdump.pl */
+	clear0bits(font + 0x1f8, 7);
+	clear0bits(font + 0x301, 7);
+	clear0bits(font + 0x308, 8);
+	clear0bits(font + 0x330, 8);
+	clear0bits(font + 0x3a0, 8);
+	clear0bits(font + 0x3d8, 8);
+	clear0bits(font + 0x3e8, 8);
+	clear0bits(font + 0x040, 16);
+	clear0bits(font + 0x1e8, 8);
+
+	/* fix the vertical bar */
+	font[0x3e0] =
+	font[0x3e1] =
+	font[0x3e2] =
+	font[0x3e3] =
+	font[0x3e4] =
+	font[0x3e5] =
+	font[0x3e6] =
+	font[0x3e7] = 0x18;
+
+	/* stick ship data where it goes */
+	for(i=0; shipdata[i][0]; i++) {
+		for(j=0; j<8; j++) {
+			font[ shipdata[i][0] * 8 + j ] = shipdata[i][j+1];
+		}
+	}
+
+	if(argc > 1) {
+		xex[0] = xex[1] = 0xff;
+		xex[2] = 0x00; xex[3] = 0xb8; /* load address $B800 */
+		xex[4] = 0xff; xex[5] = 0xbb; /* end address $bbff */
+		write(1, xex, 6);
+	}
+	write(1, font, 1024);
+
+	i = open("LORCHA.DAT", O_WRONLY | O_CREAT);
+	write(i, shipshape, sizeof(shipshape));
+	close(i);
+
+	return 0;
+}
-- 
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