Mon 21 Jul 22:43:21 CEST 2025
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js/x11/examples/xpm/node-xpm.js
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151
js/x11/examples/xpm/node-xpm.js
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/* Extracted from https://github.com/klepthys/node-xpm
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* This code is available as a standalone module named xpm
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/*
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The MIT License (MIT)
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Copyright (c) 2015 Sebastien Dumetz
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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var fs = require('fs');
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function PixmapFromFile (path,options){
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if(!options && typeof path == "object"){
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this.options = path;
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path = null;
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}else{
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this.options = options||{};
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}
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if(path){
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return this.parse(fs.readFileSync(path, {encoding:"utf-8"}));
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}
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}
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/**
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*
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* @param {[type]} data utf-8 file data
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* @param {Function} callback optionnal callback.
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*/
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PixmapFromFile.prototype.parse = function (data) {
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if(!/^\/\*\s*XPM\s*\*\/$/m.test(data)){
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throw new Error("Not an XPM file");
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}
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var size = this.getSize(data);
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var content = this.getArray(data,size);
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var colors = this.mapColors(data,size);
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size.data = this.toBuffer(colors,content,size);
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return size;
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};
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PixmapFromFile.prototype.getSize = function(data){
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var match = /{\n?"([0-9\s]*)\s?"/.exec(data);
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if(!match){
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throw new Error("can't parse size infos");
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}
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var values = match[1].split(" ").map(function(i){return parseInt(i)});
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return {width:values[0],height:values[1],count:values[2],length:values[3]}
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}
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PixmapFromFile.prototype.getArray = function(data,size){
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//var reg = new RegExp('"((?!(?:[0-9]+\\s?){4}).{'+size.length+'}(?!\\sc\\s).*)"',"g"); //Works also but much less simple
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var reg = new RegExp('"(.{'+size.width*size.length+'})"',"g");
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var res;
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var rows = [];
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while((res = reg.exec(data)) !== null){
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rows.push(res[1]);
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}
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if(rows.length != size.height){
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throw new Error("found : "+rows.length+" rows. Should have found :"+size.height+" rows.");
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}
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return rows;
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}
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// return RGBA color
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PixmapFromFile.prototype.mapColors = function(content,size){
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var reg = new RegExp('"(.' + ((size.length > 1)? "{"+(size.length)+"}" : "") + ")\\s+c\\s+#?(None|[0-9a-fA-F]{6})\"","gm");
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var res;
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var colors = {};
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while((res = reg.exec(content)) !== null){
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if(res[2] === "None"){
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colors[res[1]] = "00000000"
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}else{
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colors[res[1]] = res[2]+"FF";//RGBA
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}
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}
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if(Object.keys(colors).length != size.count){
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throw new Error("found : "+Object.keys(colors).length+" colors. Should have found :"+size.count+" colors.");
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}
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return colors;
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}
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PixmapFromFile.prototype.toBuffer = function (colors,content,size) {
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var buf = new Buffer(size.width*size.height*4);
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var offset = 0, byte,color;
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var copy;
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if( !this.options.format || this.options.format.toUpperCase() === "BGRA"){
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copy = this.copyBGRABuffer;
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}else if(this.options.format && this.options.format.toUpperCase() === "RGBA"){
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copy = this.copyRGBABuffer;
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}else{
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throw new Error("invalid format option : ",this.options.format," valid values are BGRA (default) or RGBA")
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}
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content.forEach(function(row){
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//console.log("parsing : ",row)
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while(row && row.length >0){
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var code = row.slice(0,size.length);
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row = row.slice(size.length);
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if(!colors[code]){
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throw new Error("unknown color : ",code);
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}
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offset = copy(buf,offset,colors[code]);;
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}
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});
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return buf;
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};
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/**
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* Takes an array of rows. Each char/sequence represents a colored pixel
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* @param {[type]} content [description]
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* @return {Buffer} A 1d array of pixels in RGBA
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*/
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PixmapFromFile.prototype.copyBGRABuffer = function(buf, offset, color){
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[4,2,0,6].forEach(function(i){
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buf.writeUInt8(parseInt(color[i]+color[i+1],16),offset);
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offset ++;
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});
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return offset;
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}
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PixmapFromFile.prototype.copyRGBABuffer = function(buf, offset, color){
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buf.writeUInt32BE(parseInt(color,16),offset);
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return offset+4;
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}
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PixmapFromFile.prototype.open = function(path,callback){
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var self = this;
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fs.readFile(path, {encoding:"utf-8"}, function(err,data){
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if(err){
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return callback(err);
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}else{
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callback(null,self.parse(data));
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}
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});
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}
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module.exports = PixmapFromFile;
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