Bitmap Transformer

.eslintrc

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+{
+  "rules": {
+    "no-console": "off",
+    "indent": [ "error", 2 ],
+    "quotes": [ "error", "single" ],
+    "semi": ["error", "always"],
+    "linebreak-style": [ "error", "unix" ]
+  },
+  "env": {
+    "es6": true,
+    "node": true,
+    "mocha": true,
+    "jasmine": true
+  },
+  "ecmaFeatures": {
+    "modules": true,
+    "experimentalObjectRestSpread": true,
+    "impliedStrict": true
+  },
+  "extends": "eslint:recommended"
+}

.gitignore

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+
+# Created by https://www.gitignore.io/api/node,macos,windows,linux
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+node_modules
+coverage
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules
+jspm_packages
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+
+
+### macOS ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+# Thumbnails
+._*
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+
+### Windows ###
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*

README.md

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+## Bitmap Project:
+This is a bitmap transformer built by Jonathan, Peter, and Britt.
+
+In this project, we are converting the image below using different transforms:
+
+![alt](https://raw.githubusercontent.com/brittdawn/04-bitmap-transformer/master/assets/palette-bitmap.bmp)
+
+##### Our transforms are as follows:
+- Green
+- Invert
+- Greyscale
+- Black
+- White
+- Luminosity
+
+##### Green Transform Formula
+
+> Multiply the green element (color value) of the RGBA array by the max number of colors minus one (256 - 1) or 255.
+
+##### Black & White Transform Formula
+
+> Fill the entire colorArray / its elements with 255 or 0.
+
+##### Invert Transform Formula
+
+> Subtract each color value (RGB) from 255.
+
+##### Greyscale Transform Formula
+
+> Average the RGB color values and set the color values to this average.
+
+##### Luminosity Transform Formula
+
+> Multiply the red color value by .21. Multiply the green color value by .72. Multiply the blue color value by .07.
+
+---
+## To Run This Project Locally:
+
+To run this project locally, type the following into your terminal:
+
+1. `git clone https://github.com/brittdawn/04-bitmap-transformer.git`
+2. `cd 04-bitmap-transformer/`
+3. `npm i`
+4. `node index.js`
+
+The terminal will then prompt you: "Please enter one of the following: green, white, invert, greyscale, luminosity, black or all."
+
+You may then type which transform you wish to implement, like so: `node index.js invert`.
+
+You may now go to the assets folder and see your transformed image.
+
+Repeat as you wish with other transforms.
+
+---
+## To Run Tests:
+
+You can type the following into the command line: `gulp test`.

gulpfile.js

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+'use strict';
+
+const gulp = require('gulp');
+const eslint = require('gulp-eslint');
+const mocha = require('gulp-mocha');
+const cache = require('gulp-cache');
+const istanbul = require('gulp-istanbul');
+
+gulp.task('pre-test', function() {
+  return gulp.src(['./lib/*.js', './model/*.js', '!node_modules/**'])
+    .pipe(istanbul())
+    .pipe(istanbul.hookRequire());
+});
+
+gulp.task('test', ['pre-test'], function() {
+  gulp.src('./test/*-test.js', { read: false})
+  .pipe(mocha({ report: 'spec'}))
+  .pipe(istanbul.writeReports())
+  .pipe(istanbul.enforceThresholds({thresholds: {global: 90}}));
+});
+
+gulp.task('lint', function() {
+  return gulp.src(['**/*.js', '!node_modules/**'])
+  .pipe(eslint())
+  .pipe(eslint.format())
+  .pipe(eslint.failAfterError());
+});
+
+gulp.task('dev', function() {
+  gulp.watch(['**/*.js', '!node_modules/**'], ['lint', 'test']);
+});
+
+gulp.task('default', ['dev']);
+
+gulp.task('clear', function (done) {
+  return cache.clearAll(done);
+});

index.js

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+'use strict';
+
+const readFileHelper = require('./lib/bitmap-file-helper.js');
+
+module.exports = exports = {};
+
+switch (process.argv[2]) {
+case 'green':
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'green');
+  break;
+case 'white':
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'white');
+  break;
+case 'invert':
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'invert');
+  break;
+case 'greyscale':
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'greyscale');
+  break;
+case 'luminosity':
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'luminosity');
+  break;
+case 'black':
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'black');
+  break;
+case 'all':
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'green');
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'white');
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'invert');
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'greyscale');
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'luminosity');
+  readFileHelper.bitmap(readFileHelper.filePath, readFileHelper.callback, 'black');
+  break;
+default:
+  console.log('Please enter one of the following: green, white, invert, greyscale, luminosity, black or all');
+}
+
+exports.convert = process.argv[2];

lib/bitmap-file-helper.js

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+'use strict';
+
+const fs = require('fs');
+const bitmap = require('../model/bitmap-constructor.js');
+
+module.exports = exports = {};
+exports.callback = function (err, data, convert) {
+  if (err) throw err;
+  let transform = new bitmap.BufferData(data);
+  if(convert) transform[convert]();
+};
+
+exports.bitmap = function (file, callback, color) {
+  return fs.readFile(file, function(err, data) {
+    if (err) return callback(err);
+    fs.writeFile(`${__dirname}/../assets/${color}.bmp`, data, function(err) {
+      if(err) throw err;
+    });
+    return callback(null, data, color);
+  });
+};
+
+exports.filePath = `${__dirname}/../assets/palette-bitmap.bmp`;
+exports.filePath2 = `${__dirname}/../assets/astro.bmp`;

model/bitmap-constructor.js

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+'use strict';
+
+module.exports = exports = {};
+
+exports.BufferData = function(data) {
+  this.buffer = data;
+  this.id = data.toString('utf-8', 0, 2);
+  this.size = data.readInt32LE(2);
+  this.offset = data.readInt32LE(10);
+  this.dibheader = data.readInt32LE(14);
+  this.width = data.readInt32LE(18);
+  this.height = data.readInt32LE(22);
+  this.pixel_horizontal = data.readInt32LE(38);
+  this.pixel_vertical = data.readInt32LE(42);
+  this.number_colors = data.readInt32LE(46);
+  this.colorArray = data.slice(54, this.offset);
+};
+
+exports.BufferData.prototype.green = function() {
+  for (var i = 0, j = this.colorArray.length; i < j; i += 4) {
+    let color = this.colorArray.slice(i, i+4);
+    let maxColor = this.number_colors - 1;
+    color[0] = color[2] = color[3] = 0;
+    color[1] *= maxColor;
+  }
+};
+
+exports.BufferData.prototype.white = function() {
+  this.colorArray.fill(255);
+};
+
+exports.BufferData.prototype.invert = function() {
+  for (var i = 0, j = this.colorArray.length; i < j; i += 4) {
+    let color = this.colorArray.slice(i, i+4);
+    let maxColor = this.number_colors - 1;
+    color[0] = maxColor - color[0];
+    color[1] = maxColor - color[1];
+    color[2] = maxColor - color[2];
+    color[3] = 0;
+  }
+};
+
+exports.BufferData.prototype.greyscale = function() {
+  for (var i = 0, j = this.colorArray.length; i < j; i += 4) {
+    let color = this.colorArray.slice(i, i+4);
+    let averageColor = (color[0] + color[1] + color[2] / 3);
+    color[0] = color[1] = color[2] = averageColor;
+    color[3] = 0;
+  }
+};
+
+exports.BufferData.prototype.luminosity = function() {
+  for (var i = 0, j = this.colorArray.length; i < j; i += 4) {
+    let color = this.colorArray.slice(i, i+4);
+    color[0] = color[0] * .07;
+    color[1] = color[1] * .72;
+    color[2] = color[2] * .21;
+    color[3] = 0;
+  }
+};
+
+exports.BufferData.prototype.black = function() {
+  this.colorArray.fill(0);
+};

package.json

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+{
+  "name": "04-bitmap-transformer",
+  "version": "1.0.0",
+  "description": "Fun bitmap lab.",
+  "main": "index.js",
+  "directories": {
+    "test": "test"
+  },
+  "devDependencies": {
+    "chai": "^3.5.0",
+    "eslint": "^3.12.0",
+    "gulp": "^3.9.1",
+    "gulp-cache": "^0.4.5",
+    "gulp-eslint": "^3.0.1",
+    "gulp-istanbul": "^1.1.1",
+    "gulp-mocha": "^3.0.1",
+    "mocha": "^3.2.0"
+  },
+  "scripts": {
+    "test": "mocha"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/brittdawn/04-bitmap-transformer.git"
+  },
+  "keywords": [],
+  "author": "Jonathan, Peter, Britt",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/brittdawn/04-bitmap-transformer/issues"
+  },
+  "homepage": "https://github.com/brittdawn/04-bitmap-transformer#readme"
+}