gemini/lib/image.js at v0.6.4 · gemini-testing/gemini

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'use strict';

var q = require('q'),

gm = require('gm'),

inherit = require('inherit');

var gmCompare = q.denodeify(gm.compare.bind(gm));

module.exports = inherit({

__constructor: function(buffer) {

this._gm = gm(buffer);

crop: function crop(rect) {

this._gm.crop(rect.width, rect.height, rect.left, rect.top);

return q.resolve(this);

getSize: function() {

return q.ninvoke(this._gm, 'size');

save: function save(file) {

var d = q.defer();

this._gm.write(file, function(error) {

if (error) {

return d.reject(error);

}

d.fulfill(file);

});

return d.promise;

}

}, {

compare: function(path1, path2, tolerance) {

tolerance = tolerance || 0;

return gmCompare(path1, path2, tolerance).spread(function(equal) {

return equal;

});

buildDiff: function(opts) {

var gmOpts = {

file: opts.diff,

highlightStyle: 'assign'

};

if (opts.diffColor) {

//wrap color in quotes because gm does not escape it

//and # is treated as a comment

gmOpts.highlightColor = '"' + opts.diffColor + '"';

}

return gmCompare(opts.reference, opts.current, gmOpts);

}

});

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