28 lines
872 B
JavaScript
28 lines
872 B
JavaScript
var spawn = require('child_process').spawn;
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module.exports = function compare(actual, expected, diff, t, callback) {
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var compare = spawn('compare', ['-metric', 'MAE', actual, expected, diff]);
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var error = '';
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compare.stderr.on('data', function(data) {
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error += data.toString();
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});
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compare.on('error', function(err) {
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t.error(err);
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});
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compare.on('exit', function (code) {
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// The compare program returns 2 on error otherwise 0 if the images are similar or 1 if they are dissimilar.
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if (code === 2) {
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callback(error.trim(), Infinity);
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} else {
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var match = error.match(/^\d+(?:\.\d+)?\s+\(([^\)]+)\)\s*$/);
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var difference = match ? parseFloat(match[1]) : Infinity;
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callback(match ? '' : error, difference);
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}
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});
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compare.stdin.end();
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};
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