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node.js
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node.js
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/**
* Nodejs interface
*/
'use strict';
var core = require('./core.js');
var getPixels = require('get-pixels');
/**
* @param {String|Buffer} urlOrPath url, path or buffer to pass to getPixels
* @param2 {Object|function} Options object or done function
* @param3 {function|unpassed} done function if @param2 was options object
*/
module.exports = function(urlOrPath, param2, param3) {
var done, options;
var nArgs = arguments.length;
if (nArgs === 2) {
done = param2;
options = null;
}
else if (nArgs === 3) {
options = param2;
done = param3;
}
else {
throw new Error('Bad argument count: getImageOutline(urlOrPath, [options], done)');
}
if (typeof done !== 'function' || typeof options !== 'object')
throw new TypeError('Invalid Argument');
getPixels(urlOrPath, function(err, pixels) {
if (err) {
done(err);
return;
}
if (pixels.shape.length !== 3 || pixels.shape[2] !== 4)
{
done(new Error('Image must be a normal RGBA image.'));
return;
}
var getPixel = pixels.get.bind(pixels);
var points = core(pixels.shape[0], pixels.shape[1], getPixel, options);
done(null, points);
});
};