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Copy pathindex.js
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144 lines (120 loc) · 3.33 KB
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var gm = require('gm').subClass({imageMagick: true});
module.exports = Image = function(){}
Image.prototype.setData = function(data, options){
return new Promise((resolve, reject) => {
_setData(this, data, resolve, reject, options);
});
}
Image.prototype.width = function(){
return this._size.width;
}
Image.prototype.height = function(){
return this._size.height;
}
Image.prototype.data = function(){
return Promise.resolve(this._data);
}
Image.prototype.crop = function(options){
var self = this;
var w = options.width;
var h = options.height;
var l = options.left || 0;
var t = options.top || 0;
var r = options.right || 0;
var b = options.bottom || 0;
if (!options.width) {
w = self.width()-r-l;
}
if (!options.height) {
h = self.height()-b-t;
}
var cropped = self._image.crop(w,h,l,t);
return _wrap(self, cropped, options);
}
Image.prototype.quality = function(quality, options) {
var self = this;
return _wrap(self, self._image.quality(quality), options);
}
Image.prototype.scale = function(options){
var self = this;
if(options.ratio){
options.width = options.ratio*self.width();
options.height = options.ratio*self.height();
}
return _wrap(self, self._image.scale(options.width, options.height),options);
}
Image.prototype.resize = function(options){
var self = this;
if (options.ignoreAspectRatio) {
return _wrap(self, self._image.resizeExact(options.width, options.height),options);
} else {
return _wrap(self, self._image.resize(options.width, options.height),options);
}
}
Image.prototype.setFormat = function(format,options){
var self = this;
self._image.setFormat(format.toLowerCase());
return _wrap(self, self._image, options);
}
Image.prototype.format = function(options){
return new Promise((resolve, reject) => {
this._image.format(callbackify(resolve, reject, options));
});
}
Image.prototype.pad = function(options) {
var self = this;
var w = options.width;
var h = options.height;
var l = options.left || 0;
var t = options.top || 0;
var r = options.right || 0;
var b = options.bottom || 0;
if (!options.width) {
w = self.width()+r+l;
}
if (!options.height) {
h = self.height()+b+t;
}
var padded = self._image.out("-background", options.color)
.borderColor(options.color)
.border(l, r)
.extent(w, h)
.out("-flatten")
return _wrap(self, padded, options);
}
var _setData = function(self, data, resolve, reject, options) {
self._data = data;
self._image = gm(data);
self._image.size({bufferStream: true}, function(err, size){
self._size = size;
callbackify(resolve, reject, options)(err, self);
});
}
var _callback = function(self, resolve, reject, options){
options = options || {};
return function(err, buf){
if (err) {
options.error && options.error(err);
reject(err);
} else{
_setData(self, buf, resolve, reject, options);
}
}
}
var _wrap = function(self, gm, options){
return new Promise((resolve, reject) => {
gm.toBuffer(_callback(self, resolve, reject, options));
});
}
var callbackify = function(resolve, reject, options) {
options = options || {};
return function(err, res) {
if (err) {
options.error && options.error(err);
return reject(err);
} else {
options.success && options.success(err);
return resolve(res);
}
};
}