First jameswitzema.net commit
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Lao Tzu
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/*
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Copyright (C) 2017-2020 Dimitar Toshkov Zhekov <dimitar.zhekov@gmail.com>
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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'use strict';
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const fnutil = require('./fnutil.js');
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const fncli = require('./fncli.js');
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const fnio = require('./fnio.js');
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const bdf = require('./bdf.js');
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// -- Font --
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class Font extends bdf.Font {
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constructor() {
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super();
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this.minWidth = 0; // used in proportional()
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this.avgWidth = 0;
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}
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_expand(char) {
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if (char.dwidth.x >= 0) {
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if (char.bbx.xoff >= 0) {
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var width = Math.max(char.bbx.xoff + char.bbx.width, char.dwidth.x);
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var dstXOff = char.bbx.xoff;
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var expXOff = 0;
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} else {
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width = Math.max(char.bbx.width, char.dwidth.x - char.bbx.xoff);
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dstXOff = 0;
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expXOff = char.bbx.xoff;
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}
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} else {
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const revXOff = char.bbx.xoff + char.bbx.width;
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if (revXOff <= 0) {
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width = -Math.min(char.dwidth.x, char.bbx.xoff);
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dstXOff = width + char.bbx.xoff;
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expXOff = -width;
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} else {
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width = Math.max(char.bbx.width, revXOff - char.dwidth.x);
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dstXOff = width - char.bbx.width;
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expXOff = revXOff - width;
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}
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}
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const height = this.bbx.height;
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if (width === char.bbx.width && height === char.bbx.height) {
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return;
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}
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const srcRowSize = char.bbx.rowSize();
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const dstRowSize = (width + 7) >> 3;
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const dstYMax = this.pxAscender - char.bbx.yoff;
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const dstYMin = dstYMax - char.bbx.height;
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const copyRow = (dstXOff & 7) === 0;
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const dstData = Buffer.alloc(dstRowSize * height);
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for (let dstY = dstYMin; dstY < dstYMax; dstY++) {
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let srcByteNo = (dstY - dstYMin) * srcRowSize;
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let dstByteNo = dstY * dstRowSize + (dstXOff >> 3);
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if (copyRow) {
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char.data.copy(dstData, dstByteNo, srcByteNo, srcByteNo + srcRowSize);
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} else {
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let srcBitNo = 7;
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let dstBitNo = 7 - (dstXOff & 7);
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for (let x = 0; x < char.bbx.width; x++) {
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if (char.data[srcByteNo] & (1 << srcBitNo)) {
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dstData[dstByteNo] |= (1 << dstBitNo);
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}
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if (--srcBitNo < 0) {
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srcBitNo = 7;
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srcByteNo++;
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}
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if (--dstBitNo < 0) {
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dstBitNo = 7;
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dstByteNo++;
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}
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}
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}
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}
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char.bbx = new bdf.BBX(width, height, expXOff, this.bbx.yoff);
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char.props.set('BBX', char.bbx);
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char.data = dstData;
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}
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expand() {
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// PREXPAND / VERTICAL
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const ascent = this.props.get('FONT_ASCENT');
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const descent = this.props.get('FONT_DESCENT');
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let pxAscent = (ascent == null ? 0 : fnutil.parseDec('FONT_ASCENT', ascent, 0, bdf.DPARSE_LIMIT));
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let pxDescent = (descent == null ? 0 : fnutil.parseDec('FONT_DESCENT', descent, 0, bdf.DPARSE_LIMIT));
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this.chars.forEach(char => {
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pxAscent = Math.max(pxAscent, char.bbx.height + char.bbx.yoff);
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pxDescent = Math.max(pxDescent, -char.bbx.yoff);
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});
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this.bbx.height = pxAscent + pxDescent;
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this.bbx.yoff = -pxDescent;
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// EXPAND / HORIZONTAL
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let totalWidth = 0;
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this.minWidth = this.chars[0].bbx.width;
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this.chars.forEach(char => {
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this._expand(char);
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this.minWidth = Math.min(this.minWidth, char.bbx.width);
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this.bbx.width = Math.max(this.bbx.width, char.bbx.width);
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this.bbx.xoff = Math.min(this.bbx.xoff, char.bbx.xoff);
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totalWidth += char.bbx.width;
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});
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this.avgWidth = fnutil.round(totalWidth / this.chars.length);
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this.props.set('FONTBOUNDINGBOX', this.bbx);
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}
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expandX() {
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this.chars.forEach(char => {
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if (char.dwidth.x !== char.bbx.width) { // preserve SWIDTH if possible
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char.swidth.x = fnutil.round(char.bbx.width * 1000 / this.bbx.height);
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char.props.set('SWIDTH', char.swidth);
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char.dwidth.x = char.bbx.width;
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char.props.set('DWIDTH', char.dwidth);
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}
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char.bbx.xoff = 0;
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char.props.set('BBX', char.bbx);
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});
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this.bbx.xoff = 0;
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this.props.set('FONTBOUNDINGBOX', this.bbx);
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}
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expandY() {
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const props = new Map([
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[ 'FONT_ASCENT', this.pxAscender ],
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[ 'FONT_DESCENT', -this.pxDescender ],
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[ 'PIXEL_SIZE', this.bbx.height ]
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]);
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props.forEach((value, name) => {
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if (this.props.get(name) != null) {
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this.props.set(name, value);
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}
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});
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this.xlfd[bdf.XLFD.PIXEL_SIZE] = this.bbx.height.toString();
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this.props.set('FONT', this.xlfd.join('-'));
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}
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get proportional() {
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return this.bbx.width > this.minWidth || super.proportional;
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}
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get pxAscender() {
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return this.bbx.height + this.bbx.yoff;
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}
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get pxDescender() {
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return this.bbx.yoff;
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}
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_read(input) {
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super._read(input);
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this.expand();
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return this;
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}
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static read(input) {
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return (new Font())._read(input);
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}
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_updateProp(name, value) {
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if (this.props.get(name) != null) {
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this.props.set(name, value);
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}
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}
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}
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// -- Export --
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module.exports = Object.freeze({
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Font
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});
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// -- Params --
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class Params extends fncli.Params {
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constructor() {
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super();
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this.expandX = false;
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this.expandY = false;
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this.output = null;
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}
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}
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// -- Options --
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const HELP = ('' +
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'usage: bdfexp [-X] [-Y] [-o OUTPUT] [INPUT]\n' +
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'Expand BDF font bitmaps\n' +
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'\n' +
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' -X zero xoffs, set character S/DWIDTH.X from the output\n' +
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' BBX.width if needed\n' +
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' -Y enlarge FONT_ASCENT, FONT_DESCENT and PIXEL_SIZE to\n' +
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' cover the font bounding box, if needed\n' +
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' -o OUTPUT output file (default = stdout)\n' +
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' --help display this help and exit\n' +
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' --version display the program version and license, and exit\n' +
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' --excstk display the exception stack on error\n' +
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'\n' +
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'The input must be a BDF 2.1 font with unicode encoding.\n');
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const VERSION = 'bdfexp 1.60, Copyright (C) 2017-2020 Dimitar Toshkov Zhekov\n\n' + fnutil.GPL2PLUS_LICENSE;
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class Options extends fncli.Options {
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constructor() {
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super(['-o'], HELP, VERSION);
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}
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parse(name, value, params) {
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switch (name) {
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case '-X':
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params.expandX = true;
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break;
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case '-Y':
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params.expandY = true;
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break;
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case '-o':
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params.output = value;
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break;
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default:
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this.fallback(name, params);
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}
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}
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}
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// -- Main --
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function mainProgram(nonopt, parsed) {
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if (nonopt.length > 1) {
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throw new Error('invalid number of arguments, try --help');
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}
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// READ INPUT
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let ifs = new fnio.InputFileStream(nonopt[0]);
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try {
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var font = Font.read(ifs);
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ifs.close();
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} catch (e) {
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e.message = ifs.location() + e.message;
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throw e;
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}
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// EXTRA ACTIONS
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if (parsed.expandX) {
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font.expandX();
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}
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if (parsed.expandY) {
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font.expandY();
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}
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// WRITE OUTPUT
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let ofs = new fnio.OutputFileStream(parsed.output);
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try {
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font.write(ofs);
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ofs.close();
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} catch (e) {
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e.message = ofs.location() + e.message() + ofs.destroy();
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throw e;
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}
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}
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if (require.main === module) {
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fncli.start('bdfexp.js', new Options(), new Params(), mainProgram);
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}
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