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executable file 121 lines (100 sloc) 2.95 KB
#!/usr/bin/node
/*
This file is part of Espruino, a JavaScript interpreter for Microcontrollers
Copyright (C) 2013 Gordon Williams <gw@pur3.co.uk>
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.
----------------------------------------------------------------------------------------
Bitmap font creator for Graphics custom fonts
This is pretty rough-and-ready, and in order to easily get bitmap data out of an image
it requires the image to already be in RAW format.
For this, use ImageMagick as follows: `convert charset_8x12.png -depth 8 gray:charset_8x12.raw`
----------------------------------------------------------------------------------------
*/
// npm install btoa
var FIXEDWIDTH = false;
var FIRSTCHAR = 32;
var MAXCHARS = 189; // excludes FIRSTCHAR offset
// image width and height, character width and height
var W = 128;
var H = 72;
var CW = 8;
var CH = 12;
var FILENAME = "charset_8x12.raw";
/*
var W = 192;
var H = 24;
var CW = 6;
var CH = 8;
var FILENAME = "charset_6x8.raw";
*/
pixels = require("fs").readFileSync(FILENAME);
var bits = [];
var charWidths = [];
function genChar(xo,yo) {
// work out widths
if (FIXEDWIDTH) {
xStart = 0;
xEnd = CW-1;
} else {
var xStart = CW;
var xEnd = 0;
for (var x=0;x<CW;x++) {
var set = false;
for (var y=0;y<CH;y++) {
var idx = x+xo+((y+yo)*W);
set |= pixels[idx]<=128;
}
if (set) {
if (x<xStart) xStart = x;
xEnd = x;
}
}
if (xStart>xEnd) {
xStart=0;
xEnd = CW/2; // treat space as half-width
} else if (xEnd<CW-1)
xEnd++; // if not full width, add a space after
}
charWidths.push(xEnd+1-xStart);
var debugText = [];
for (var y=0;y<CH;y++) debugText.push("");
for (var x=xStart;x<=xEnd;x++) {
for (var y=0;y<CH;y++) {
var idx = x+xo+((y+yo)*W);
var col = pixels[idx]>128;
debugText[y] += col?" ":"#";
bits.push(col ? 0 : 1);
}
}
console.log("charcode ",FIRSTCHAR+charWidths.length-1,":",xo,",",yo);
console.log(debugText.join("\n"));
console.log();
}
// get an array of bits
var x=0,y=0;
while (y < H && charWidths.length<MAXCHARS) {
genChar(x,y);
x += CW;
if (x>=W) {
x = 0;
y += CH;
}
}
// compact array
var bytes = "";
for (var i=0;i<bits.length;i+=8) {
var byte = 0;
for (var b=0;b<8;b++)
if (bits[i+b]===1) byte += 1<<(7-b);
bytes += String.fromCharCode(byte);
}
// convert width array - widthBytes
var widthBytes = "";
for (i in charWidths)
widthBytes += String.fromCharCode(charWidths[i]);
// widthBytes = charWidths.map(String.fromCharCode).join(""); doesn't work here - too many 0 chars
console.log("var font = atob(\""+require('btoa')(bytes)+"\");");
console.log("var widths = atob(\""+require('btoa')(widthBytes)+"\");");
console.log("g.setFontCustom(font, "+FIRSTCHAR+", widths, "+CH+");");