framework/image.js at master · JavaScriptIOT/framework · GitHub

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// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

/**

* @module FrameworkImage

* @version 2.9.2

'use strict';

const sof = { 0xc0: true, 0xc1: true, 0xc2: true, 0xc3: true, 0xc5: true, 0xc6: true, 0xc7: true, 0xc9: true, 0xca: true, 0xcb: true, 0xcd: true, 0xce: true, 0xcf: true };

const child = require('child_process');

const exec = child.exec;

const spawn = child.spawn;

const Fs = require('fs');

const REGEXP_SVG = /(width="\d+")+|(height="\d+")+/g;

const REGEXP_PATH = /\//g;

const REGEXP_ESCAPE = /'/g;

const D = require('os').platform().substring(0, 3).toLowerCase() === 'win' ? '"' : '\'';

var CACHE = {};

var middlewares = {};

if (!global.framework_utils)

global.framework_utils = require('./utils');

function u16(buf, o) {

return buf[o] << 8 | buf[o + 1];

}

function u32(buf, o) {

return buf[o] << 24 | buf[o + 1] << 16 | buf[o + 2] << 8 | buf[o + 3];

}

exports.measureGIF = function(buffer) {

return { width: buffer[6], height: buffer[8] };

};

// MIT

// Written by TJ Holowaychuk

// visionmedia

exports.measureJPG = function(buffer) {

var len = buffer.length;

var o = 0;

var jpeg = 0xff == buffer[0] && 0xd8 == buffer[1];

if (!jpeg)

return;

o += 2;

while (o < len) {

while (0xff != buffer[o]) o++;

while (0xff == buffer[o]) o++;

if (!sof[buffer[o]]) {

o += u16(buffer, ++o);

continue;

}

var w = u16(buffer, o + 6);

var h = u16(buffer, o + 4);

return { width: w, height: h };

}

return null;

};

// MIT

// Written by TJ Holowaychuk

// visionmedia

exports.measurePNG = function(buffer) {

return { width: u32(buffer, 16), height: u32(buffer, 16 + 4) };

};

exports.measureSVG = function(buffer) {

var match = buffer.toString('utf8').match(REGEXP_SVG);

if (!match)

return;

var width = 0;

var height = 0;

for (var i = 0, length = match.length; i < length; i++) {

var value = match[i];

if (width > 0 && height > 0)

break;

if (!width && value.startsWith('width="'))

width = value.parseInt2();

if (!height && value.startsWith('height="'))

height = value.parseInt2();

}

return { width: width, height: height };

};

exports.measure = function(type, buffer) {

switch (type) {

case '.jpg':

case '.jpeg':

case 'jpg':

case 'jpeg':

case 'image/jpeg':

return exports.measureJPG(buffer);

case '.gif':

case 'gif':

case 'image/gif':

return exports.measureGIF(buffer);

case '.png':

case 'png':

case 'image/png':

return exports.measurePNG(buffer);

case '.svg':

case 'svg':

case 'image/svg+xml':

return exports.measureSVG(buffer);

}

};

function Image(filename, useImageMagick, width, height) {

var type = typeof(filename);

this.width = width;

this.height = height;

this.builder = [];

this.filename = type === 'string' ? filename : null;

this.currentStream = type === 'object' ? filename : null;

this.isIM = useImageMagick == null ? F.config['default-image-converter'] === 'im' : useImageMagick;

this.outputType = type === 'string' ? framework_utils.getExtension(filename) : 'jpg';

this.islimit = false;

}

Image.prototype.clear = function() {

var self = this;

self.builder = [];

return self;

};

Image.prototype.measure = function(callback) {

var self = this;

var index = self.filename.lastIndexOf('.');

if (!self.filename) {

callback(new Error('Measure does not support stream.'));

return;

}

if (index === -1) {

callback(new Error('This type of file is not supported.'));

return;

}

var extension = self.filename.substring(index).toLowerCase();

var stream = require('fs').createReadStream(self.filename, { start: 0, end: extension === '.jpg' ? 40000 : 24 });

stream.on('data', function(buffer) {

switch (extension) {

case '.jpg':

callback(null, exports.measureJPG(buffer));

return;

case '.gif':

callback(null, exports.measureGIF(buffer));

return;

case '.png':

callback(null, exports.measurePNG(buffer));

return;

}

callback(new Error('This type of file is not supported.'));

});

stream.on('error', callback);

return self;

};

Image.prototype.$$measure = function() {

var self = this;

return function(callback) {

self.measure(callback);

};

/**

* Execute commands

* @param {String} filename

* @param {Function(err, filename)} callback Optional.

* @param {Function(stream)} writer A custom stream writer, optional.

* @return {Image}

Image.prototype.save = function(filename, callback, writer) {

var self = this;

if (typeof(filename) === 'function') {

callback = filename;

filename = null;

}

!self.builder.length && self.minify();

filename = filename || self.filename || '';

var command = self.cmd(self.filename ? self.filename : '-', filename);

if (F.isWindows)

command = command.replace(REGEXP_PATH, '\\');

var cmd = exec(command, function(err) {

// clean up

cmd.kill();

cmd = null;

self.clear();

if (!callback)

return;

if (err) {

callback(err, false);

return;

}

var middleware = middlewares[self.outputType];

if (!middleware)

return callback(null, true);

var reader = Fs.createReadStream(filename);

var writer = Fs.createWriteStream(filename + '_');

reader.pipe(middleware()).pipe(writer);

writer.on('finish', () => Fs.rename(filename + '_', filename, () => callback(null, true)));

});

if (self.currentStream) {

if (self.currentStream instanceof Buffer)

cmd.stdin.end(self.currentStream);

else

self.currentStream.pipe(cmd.stdin);

}

CLEANUP(cmd.stdin);

writer && writer(cmd.stdin);

return self;

};

Image.prototype.$$save = function(filename, writer) {

var self = this;

return function(callback) {

self.save(filename, callback, writer);

};

Image.prototype.pipe = function(stream, type, options) {

var self = this;

if (typeof(type) === 'object') {

options = type;

type = null;

}

!self.builder.length && self.minify();

!type && (type = self.outputType);

var cmd = spawn(self.isIM ? 'convert' : 'gm', self.arg(self.filename ? wrap(self.filename) : '-', (type ? type + ':' : '') + '-'));

cmd.stderr.on('data', stream.emit.bind(stream, 'error'));

cmd.stdout.on('data', stream.emit.bind(stream, 'data'));

cmd.stdout.on('end', stream.emit.bind(stream, 'end'));

cmd.on('error', stream.emit.bind(stream, 'error'));

var middleware = middlewares[type];

if (middleware)

cmd.stdout.pipe(middleware()).pipe(stream, options);

else

cmd.stdout.pipe(stream, options);

if (self.currentStream) {

if (self.currentStream instanceof Buffer)

cmd.stdin.end(self.currentStream);

else

self.currentStream.pipe(cmd.stdin);

}

return self;

};

/**

* Create a stream

* @param {String} type File type (png, jpg, gif)

* @param {Function(stream)} writer A custom stream writer.

* @return {ReadStream}

Image.prototype.stream = function(type, writer) {

var self = this;

!self.builder.length && self.minify();

if (!type)

type = self.outputType;

var cmd = spawn(self.isIM ? 'convert' : 'gm', self.arg(self.filename ? wrap(self.filename) : '-', (type ? type + ':' : '') + '-'));

if (self.currentStream) {

if (self.currentStream instanceof Buffer)

cmd.stdin.end(self.currentStream);

else

self.currentStream.pipe(cmd.stdin);

}

writer && writer(cmd.stdin);

var middleware = middlewares[type];

return middleware ? cmd.stdout.pipe(middleware()) : cmd.stdout;

};

Image.prototype.cmd = function(filenameFrom, filenameTo) {

var self = this;

var cmd = '';

if (!self.islimit) {

var tmp = F.config['default-image-consumption'];

self.limit('memory', (1500 / 100) * tmp);

self.limit('map', (3000 / 100) * tmp);

}

self.builder.sort(sort);

var length = self.builder.length;

for (var i = 0; i < length; i++)

cmd += (cmd ? ' ' : '') + self.builder[i].cmd;

return (self.isIM ? 'convert' : 'gm -convert') + wrap(filenameFrom, true) + ' ' + cmd + wrap(filenameTo, true);

};

function sort(a, b) {

return a.priority > b.priority ? 1 : -1;

}

Image.prototype.arg = function(first, last) {

var self = this;

var arr = [];

!self.isIM && arr.push('-convert');

first && arr.push(first);

if (!self.islimit) {

var tmp = F.config['default-image-consumption'];

self.limit('memory', (1500 / 100) * tmp);

self.limit('map', (3000 / 100) * tmp);

}

self.builder.sort(sort);

var length = self.builder.length;

for (var i = 0; i < length; i++) {

var o = self.builder[i];

var index = o.cmd.indexOf(' ');

if (index === -1)

arr.push(o.cmd);

else {

arr.push(o.cmd.substring(0, index));

arr.push(o.cmd.substring(index + 1).replace(/"/g, ''));

}

last && arr.push(last);

return arr;

};

Image.prototype.identify = function(callback) {

var self = this;

exec((self.isIM ? 'identify' : 'gm identify') + wrap(self.filename, true), function(err, stdout) {

if (err) {

callback(err, null);

return;

}

var arr = stdout.split(' ');

var size = arr[2].split('x');

var obj = { type: arr[1], width: framework_utils.parseInt(size[0]), height: framework_utils.parseInt(size[1]) };

callback(null, obj);

});

return self;

};

Image.prototype.$$identify = function() {

var self = this;

return function(callback) {

self.identify(callback);

};

Image.prototype.push = function(key, value, priority, encode) {

var self = this;

var cmd = key;

if (value != null) {

if (encode && typeof(value) === 'string')

cmd += ' ' + D + value.replace(REGEXP_ESCAPE, '') + D;

else

cmd += ' ' + value;

}

var obj = CACHE[cmd];

if (obj) {

obj.priority = priority;

self.builder.push(obj);

} else {

CACHE[cmd] = { cmd: cmd, priority: priority };

self.builder.push(CACHE[cmd]);

}

return self;

};

Image.prototype.output = function(type) {

var self = this;

if (type[0] === '.')

type = type.substring(1);

self.outputType = type;

return self;

};

Image.prototype.resize = function(w, h, options) {

options = options || '';

var self = this;

var size = '';

if (w && h)

size = w + 'x' + h;

else if (w && !h)

size = w + 'x';

else if (!w && h)

size = 'x' + h;

return self.push('-resize', size + options, 1, true);

};

Image.prototype.thumbnail = function(w, h, options) {

options = options || '';

var self = this;

var size = '';

if (w && h)

size = w + 'x' + h;

else if (w && !h)

size = w;

else if (!w && h)

size = 'x' + h;

return self.push('-thumbnail', size + options, 1, true);

};

Image.prototype.geometry = function(w, h, options) {

options = options || '';

var self = this;

var size = '';

if (w && h)

size = w + 'x' + h;

else if (w && !h)

size = w;

else if (!w && h)

size = 'x' + h;

return self.push('-geometry', size + options, 1, true);

};

Image.prototype.filter = function(type) {

return this.push('-filter', type, 1, true);

};

Image.prototype.trim = function() {

return this.push('-trim +repage', 1);

};

Image.prototype.limit = function(type, value) {

this.islimit = true;

return this.push('-limit', type + ' ' + value, 1);

};

Image.prototype.extent = function(w, h) {

var self = this;

var size = '';

if (w && h)

size = w + 'x' + h;

else if (w && !h)

size = w;

else if (!w && h)

size = 'x' + h;

return self.push('-extent', size, 4, true);

};

/**

* Resize picture to miniature (full picture)

* @param {Number} w

* @param {Number} h

* @param {String} color Optional, background color.

* @param {String} filter Optional, resize filter (default: Box)

* @return {Image}

Image.prototype.miniature = function(w, h, color, filter) {

return this.filter(filter || 'Hamming').thumbnail(w, h).background(color ? color : 'white').align('center').extent(w, h);

};

/**

* Resize picture to center

* @param {Number} w

* @param {Number} h

* @param {String} color Optional, background color.

* @return {Image}

Image.prototype.resizeCenter = function(w, h, color) {

return this.resize(w, h, '^').background(color ? color : 'white').align('center').crop(w, h);

};

/**

* Resize picture to align

* @param {Number} w

* @param {Number} h

* @param {String} align (top, center, bottom)

* @param {String} color Optional, background color.

* @return {Image}

Image.prototype.resizeAlign = function(w, h, align, color) {

return this.resize(w, h, '^').background(color ? color : 'white').align(align || 'center').crop(w, h);

};

Image.prototype.scale = function(w, h, options) {

options = options || '';

var self = this;

var size = '';

if (w && h)

size = w + 'x' + h;

else if (w && !h)

size = w;

else if (!w && h)

size = 'x' + h;

return self.push('-scale', size + options, 1, true);

};

Image.prototype.crop = function(w, h, x, y) {

return this.push('-crop', w + 'x' + h + '+' + (x || 0) + '+' + (y || 0), 4, true);

};

Image.prototype.quality = function(percentage) {

return this.push('-quality', percentage || 80, 5, true);

};

Image.prototype.align = function(type) {

var output;

switch (type) {

case 'left top':

case 'top left':

output = 'NorthWest';

break;

case 'left bottom':

case 'bottom left':

output = 'SouthWest';

break;

case 'right top':

case 'top right':

output = 'NorthEast';

break;

case 'right bottom':

case 'bottom right':

output = 'SouthEast';

break;

case 'left center':

case 'center left':

case 'left':

output = 'West';

break;

case 'right center':

case 'center right':

case 'right':

output = 'East';

break;

case 'bottom center':

case 'center bottom':

case 'bottom':

output = 'South';

break;

case 'top center':

case 'center top':

case 'top':

output = 'North';

break;

case 'center center':

case 'center':

case 'middle':

output = 'Center';

break;

default:

output = type;

break;

}

output && this.push('-gravity', output, 3, true);

return this;

};

Image.prototype.gravity = function(type) {

return this.align(type);

};

Image.prototype.blur = function(radius) {

return this.push('-blur', radius, 10, true);

};

Image.prototype.normalize = function() {

return this.push('-normalize', null, 10);

};

Image.prototype.rotate = function(deg) {

return this.push('-rotate', deg || 0, 8, true);

};

Image.prototype.flip = function() {

return this.push('-flip', null, 10);

};

Image.prototype.flop = function() {

return this.push('-flop', null, 10);

};

Image.prototype.minify = function() {

return this.push('+profile', '*', null, 10, true);

};

Image.prototype.grayscale = function() {

return this.push('-colorspace', 'Gray', 10, true);

};

Image.prototype.bitdepth = function(value) {

return this.push('-depth', value, 10, true);

};

Image.prototype.colors = function(value) {

return this.push('-colors', value, 10, true);

};

Image.prototype.background = function(color) {

return this.push('-background', color, 2, true).push('-extent 0x0', null, 2);

};

Image.prototype.fill = function(color) {

return this.push('-fill', color, 2, true);

};

Image.prototype.sepia = function() {

return this.push('-modulate', '115,0,100', 4).push('-colorize', '7,21,50', 5);

};

Image.prototype.watermark = function(filename, x, y, w, h) {

return this.push('-draw', 'image over {1},{2} {3},{4} {5}{0}{5}'.format(filename, x || 0, y || 0, w || 0, h || 0, D), 6, true);

};

Image.prototype.make = function(fn) {

fn.call(this, this);

return this;

};

Image.prototype.command = function(key, value, priority, esc) {

if (priority === true) {

priority = 0;

esc = true;

}

return this.push(key, value, priority || 10, esc);

};

function wrap(command, empty) {

return (empty ? ' ' : '') + (command === '-' ? command : (D + command.replace(REGEXP_ESCAPE, '') + D));

}

exports.Image = Image;

exports.Picture = Image;

exports.init = function(filename, imageMagick, width, height) {

return new Image(filename, imageMagick, width, height);

};

exports.load = function(filename, imageMagick, width, height) {

return new Image(filename, imageMagick, width, height);

};

exports.middleware = function(type, fn) {

if (type[0] === '.')

type = type.substring(1);

middlewares[type] = fn;

};

exports.restart = function() {

middlewares = {};

};

// Clears cache with commands

exports.clear = function() {

CACHE = {};

};

global.Image = exports;

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