Image screenshot and comparison tool

gistfile1.txt

/*
Needs PhantomJS
uses Node.js File API
uses base64 encoding
 
event based on rendering image.
 
node modules:
JsDiff (https://github.com/kpdecker/jsdiff)
colors.js (https://github.com/brehaut/color-js)

imagemagick (node npm)
events (node npm)
keep in 1 place (node_modules)..then can do npm install <whatever as for>

npm install
-reads a package.json for dependencies

CAIRO (for imagediff):
sudo cp /opt/X11/lib/pkgconfig/* /usr/local/lib/pkgconfig/
*/
 
 
/////////////// CREATE BASE64
 
var Base64 = {
 
    // private property
    _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
 
    // public method for encoding
    encode : function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;
 
        input = Base64._utf8_encode(input);
 
        while (i < input.length) {
 
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);
 
            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;
 
            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }
 
            output = output +
            this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
            this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
 
        }
 
        return output;
    },
 
    // public method for decoding
    decode : function (input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;
 
        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
 
        while (i < input.length) {
 
            enc1 = this._keyStr.indexOf(input.charAt(i++));
            enc2 = this._keyStr.indexOf(input.charAt(i++));
            enc3 = this._keyStr.indexOf(input.charAt(i++));
            enc4 = this._keyStr.indexOf(input.charAt(i++));
 
            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;
 
            output = output + String.fromCharCode(chr1);
 
            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }
 
        }
 
        output = Base64._utf8_decode(output);
 
        return output;
 
    },
 
    // private method for UTF-8 encoding
    _utf8_encode : function (string) {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";
 
        for (var n = 0; n < string.length; n++) {
 
            var c = string.charCodeAt(n);
 
            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }
 
        }
 
        return utftext;
    },
 
    // private method for UTF-8 decoding
    _utf8_decode : function (utftext) {
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;
 
        while ( i < utftext.length ) {
 
            c = utftext.charCodeAt(i);
 
            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            }
            else if((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i+1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            }
            else {
                c2 = utftext.charCodeAt(i+1);
                c3 = utftext.charCodeAt(i+2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }
 
        }
 
        return string;
    },
 
    grabFileContents : function(file) {
 
        'use strict';
 
        var fs = require('fs'),
            system = require('system');
 
        var content = '',
            f = null;
 
        try {
            f = fs.open(file, "r");
            content = f.read();
        } catch (e) {
            return false;
            //console.log(e);
        }
 
        if (f) {
            f.close();
        }
 
        return Base64.encode(content);
    },
 
    theComparison : function() {
        /////////// COMPARE
        var one = Base64.grabFileContents("screenshots/3.png");
 
        if (one === false) {
            console.log('first dosnt exist');
            console.log('delete second now');
        } else {
            var two = Base64.grabFileContents("screenshots/4.png");
 
            if (two === false) {
                console.log('second doesnt exist')
            } else {
                console.log('comparison:', one === two);
               
               /* IMAGE MAGICK
               var im = require('imagemagick');
               im.identify('screenshots/3.png', function(err, features){
                if (err) throw err;
                  console.log(features);
                  // { format: 'JPEG', width: 3904, height: 2622, depth: 8 }
                });
                */

//emitter, util
/*
var gm = require('gm');

gm('screenshots/3.png')
.resize(353, 257)
.autoOrient()
.write(writeStream, function (err) {
  if (!err) console.log(' hooray! ');
});

*/

                var imageDiff = require('imagediff');
console.log('END');
                var three = imageDiff.diff("/Users/taubc01/Documents/cssregression/screenshots/4.png", "/Users/taubc01/Documents/cssregression/screenshots/3.png");
                imageDiff.imageDataToPNG(three, "/Users/taubc01/Documents/cssregression/screenshots/file.diff.png");
console.log('DONE!!');
/*
Error: Cannot find module 'stream'

TRY:

-git clone js-imagediff
-git clone canvas
sudo gem install jasmine-headless-webkit
sudo port install qt4-mac
cd js-imagediff
make
FAIL

OR

sudo npm install -g imagediff
or (npm install canvas)
brew install cairo
-issue
https://github.com/LearnBoost/node-canvas/wiki/Installation---OSX
-issue
sudo port install cairo
#ln -s /opt/X11/lib/pkgconfig/cairo.pc /usr/local/lib/pkgconfig/cairo.pc
?

OR

git clone git://anongit.freedesktop.org/git/cairo cairo
?

OR

npm install stream
-installs into node_modules folder
- require(''); will check there by default


NEED CAIRO FOR CANVAS
NEED CANVAS FOR IMAGEDIFF

                var three = imageDiff.diff(one, two);
                imageDataToPNG(three, "file.diff");


                /* DIFF 
                var JsDiff = require('/Users/craigtaub/Documents/PhantomCSS/jsdiff/diff.js');
                
                var oldString = 'beep boop';
                var newString = 'beep boob blah';
 
                //console.log(newString);
                var diff = JsDiff.diffChars(oldString, newString);
 
                var array = [];
                diff.forEach(function(part){
                        //console.log('1');
                      //string = part.value;
                      //array.push(string);
                });
                */
 
                /*  COLORS.js
                var colors = require('/Users/craigtaub/Documents/PhantomCSS/colors.js/colors.js');
 
                var bigString = [];
                diff.forEach(function(part){
                    var color = part.added ? 'green' :
                        part.removed ? 'red' : 'grey';
                      var string = "";
                      string = part.value;
                      //console.log(string . green , string . red);  
                      //many colors 1 line
                      //need to pass colour as variable NOT string ??
 
                      if(color === 'green'){
                        //console.log(string . green); 
                       }
                       if(color === 'grey'){
                        //console.log(string . green); 
                       }
                      if(color === 'red'){
                        //console.log(string . green); 
                       }
                       //console.log(string);
                       bigString.push(string);
                      //var bigString = bigString.concat(string);
                      //console.log(bigString);
 
                });
                console.log(bigString[0] . red ,bigString[1] . green ,bigString[2] . grey);
                */
 
                
 
 
 
            }
        }
    }
 
}
 
 
/// CREATE SNAPSHOT
 
var page = require('webpage').create();
page.open('index.html', function () {
    page.viewportSize = { width: 1000, height: 200 };
    page.render('screenshots/4.png');
    //    var one = page.renderBase64();
    //    phantom.exit();
 
    Base64.theComparison();
 
    
    //END EVERYTHING
    phantom.exit();
 
 
});