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CDB-3686 Adds support for per mil tolerance when comparing images as in Mac OS X some results from ImageMagick are a bit odd

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This commit is contained in:
Raul Ochoa 2014-08-04 01:30:24 +02:00
parent 9b5921e8e1
commit 73d1db3bd2
3 changed files with 61 additions and 38 deletions
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11
test/acceptance/multilayer.js
View File

@ -14,6 +14,9 @@ var helper = require(__dirname + '/../support/test_helper');
var windshaft_fixtures = __dirname + '/../../node_modules/windshaft/test/fixtures';
var IMAGE_EQUALS_TOLERANCE_PER_MIL = 20;
var IMAGE_EQUALS_HIGHER_TOLERANCE_PER_MIL = 25;
var CartodbWindshaft = require(__dirname + '/../../lib/cartodb/cartodb_windshaft');
var ServerOptions = require(__dirname + '/../../lib/cartodb/server_options');
serverOptions = ServerOptions();
@ -117,7 +120,7 @@ suite('multilayer', function() {
+ expectedQuery
+ '$windshaft$)::regclass[])');
assert.imageEqualsFile(res.body, 'test/fixtures/test_table_0_0_0_multilayer1.png', 2,
assert.imageEqualsFile(res.body, 'test/fixtures/test_table_0_0_0_multilayer1.png', IMAGE_EQUALS_HIGHER_TOLERANCE_PER_MIL,
function(err, similarity) {
next(err);
});
@ -400,7 +403,7 @@ suite('multilayer', function() {
+ expectedQuery
+ '$windshaft$)::regclass[])');
assert.imageEqualsFile(res.body, 'test/fixtures/test_multilayer_bbox.png', 2,
assert.imageEqualsFile(res.body, 'test/fixtures/test_multilayer_bbox.png', IMAGE_EQUALS_TOLERANCE_PER_MIL,
function(err, similarity) {
next(err);
});
@ -438,7 +441,7 @@ suite('multilayer', function() {
+ expectedQuery
+ '$windshaft$)::regclass[])');
assert.imageEqualsFile(res.body, 'test/fixtures/test_multilayer_bbox.png', 2,
assert.imageEqualsFile(res.body, 'test/fixtures/test_multilayer_bbox.png', IMAGE_EQUALS_TOLERANCE_PER_MIL,
function(err, similarity) {
next(err);
});
@ -1067,7 +1070,7 @@ suite('multilayer', function() {
}, {}, function(res) {
assert.equal(res.statusCode, 200, res.body);
assert.equal(res.headers['content-type'], "image/png");
assert.imageEqualsFile(res.body, windshaft_fixtures + '/test_default_mapnik_point.png', 2,
assert.imageEqualsFile(res.body, windshaft_fixtures + '/test_default_mapnik_point.png', IMAGE_EQUALS_TOLERANCE_PER_MIL,
function(err, similarity) {
next(err);
});

21
test/acceptance/server.js
View File

@ -11,6 +11,9 @@ var SQLAPIEmu = require(__dirname + '/../support/SQLAPIEmu.js');
var helper = require(__dirname + '/../support/test_helper');
var IMAGE_EQUALS_TOLERANCE_PER_MIL = 20,
IMAGE_EQUALS_ZERO_TOLERANCE_PER_MIL = 0;
var CartodbWindshaft = require(__dirname + '/../../lib/cartodb/cartodb_windshaft');
var serverOptions = require(__dirname + '/../../lib/cartodb/server_options')();
var server = new CartodbWindshaft(serverOptions);
@ -842,7 +845,7 @@ suite('server', function() {
assert.equal(res.statusCode, 200, res.statusCode + ': ' + res.body);
var ct = res.headers['content-type'];
assert.equal(ct, 'image/png');
assert.imageEqualsFile(res.body, './test/fixtures/test_table_15_16046_12354_styled_black.png', 2,
assert.imageEqualsFile(res.body, './test/fixtures/test_table_15_16046_12354_styled_black.png', IMAGE_EQUALS_TOLERANCE_PER_MIL,
function(err, similarity) {
if (err) throw err;
done();
@ -873,7 +876,7 @@ suite('server', function() {
assert.equal(ct, 'image/png');
assert.imageEqualsFile(res.body,
'./test/fixtures/test_table_15_16046_12354_styled_black.png',
2, this);
IMAGE_EQUALS_TOLERANCE_PER_MIL, this);
},
function checkImage(err, similarity) {
if (err) throw err;
@ -910,7 +913,7 @@ suite('server', function() {
assert.equal(ct, 'image/png');
assert.imageEqualsFile(res.body,
'./test/fixtures/test_table_15_16046_12354_styled_black.png',
2, this);
IMAGE_EQUALS_TOLERANCE_PER_MIL, this);
},
function checkImage(err, similarity) {
if (err) throw err;
@ -934,7 +937,7 @@ suite('server', function() {
assert.equal(res.statusCode, 200, res.statusCode + ': ' + res.body);
var ct = res.headers['content-type'];
assert.equal(ct, 'image/png');
assert.imageEqualsFile(res.body, './test/fixtures/test_table_15_16046_12354_styled_black.png', 2,
assert.imageEqualsFile(res.body, './test/fixtures/test_table_15_16046_12354_styled_black.png', IMAGE_EQUALS_TOLERANCE_PER_MIL,
function(err, similarity) {
if (err) throw err;
done();
@ -971,7 +974,7 @@ suite('server', function() {
assert.equal(res.statusCode, 200, res.statusCode + ': ' + res.body);
var ct = res.headers['content-type'];
assert.equal(ct, 'image/png');
assert.imageEqualsFile(res.body, './test/fixtures/test_table_15_16046_12354_styled_black.png', 2,
assert.imageEqualsFile(res.body, './test/fixtures/test_table_15_16046_12354_styled_black.png', IMAGE_EQUALS_TOLERANCE_PER_MIL,
function(err, similarity) {
next(err);
});
@ -1011,7 +1014,7 @@ suite('server', function() {
assert.equal(res.statusCode, 200, res.statusCode + ': ' + res.body);
var ct = res.headers['content-type'];
assert.equal(ct, 'image/png');
assert.imageEqualsFile(res.body, './test/fixtures/blank.png', 0,
assert.imageEqualsFile(res.body, './test/fixtures/blank.png', IMAGE_EQUALS_ZERO_TOLERANCE_PER_MIL,
function(err, similarity) {
if (err) next(err);
else next();
@ -1031,7 +1034,7 @@ suite('server', function() {
assert.equal(res.statusCode, 200, res.statusCode + ': ' + res.body);
var ct = res.headers['content-type'];
assert.equal(ct, 'image/png');
assert.imageEqualsFile(res.body, './test/fixtures/blank.png', 0,
assert.imageEqualsFile(res.body, './test/fixtures/blank.png', IMAGE_EQUALS_ZERO_TOLERANCE_PER_MIL,
function(err, similarity) {
if (err) next(err);
else next();
@ -1068,7 +1071,7 @@ suite('server', function() {
assert.equal(res.statusCode, 200, res.statusCode + ': ' + res.body);
var ct = res.headers['content-type'];
assert.equal(ct, 'image/png');
assert.imageEqualsFile(res.body, './test/fixtures/test_table_15_16046_12354_styled_black.png', 2,
assert.imageEqualsFile(res.body, './test/fixtures/test_table_15_16046_12354_styled_black.png', IMAGE_EQUALS_TOLERANCE_PER_MIL,
function(err, similarity) {
// NOTE: we expect them to be EQUAL here
if (err) { next(err); return; }
@ -1105,7 +1108,7 @@ suite('server', function() {
assert.equal(res.statusCode, 200, res.statusCode + ': ' + res.body);
var ct = res.headers['content-type'];
assert.equal(ct, 'image/png');
assert.imageEqualsFile(res.body, './test/fixtures/test_table_15_16046_12354_styled_black.png', 2,
assert.imageEqualsFile(res.body, './test/fixtures/test_table_15_16046_12354_styled_black.png', IMAGE_EQUALS_TOLERANCE_PER_MIL,
function(err, similarity) {
// NOTE: we expect them to be different here
if (err) next();

67
test/support/assert.js
View File

@ -1,10 +1,11 @@
// Cribbed from the ever prolific Konstantin Kaefer
// https://github.com/mapbox/tilelive-mapnik/blob/master/test/support/assert.js
var fs = require('fs');
var http = require('http');
var path = require('path');
var exec = require('child_process').exec;
var exec = require('child_process').exec,
fs = require('fs'),
http = require('http'),
path = require('path'),
util = require('util');
var assert = module.exports = exports = require('assert');
@ -66,35 +67,51 @@ assert.utfgridEqualsFile = function(buffer, file_b, tolerance, callback) {
callback(err);
};
//
// @param tol tolerated color distance as a percent over max channel value
// by default this is zero. For meaningful values, see
// http://www.imagemagick.org/script/command-line-options.php#metric
//
assert.imageEqualsFile = function(buffer, file_b, tol, callback) {
/**
* Takes an image data as an input and an image path and compare them using ImageMagick fuzz algorithm, if case the
* similarity is not within the tolerance limit it will callback with an error.
*
* @param buffer The image data to compare from
* @param {string} referenceImageRelativeFilePath The relative file to compare against
* @param {number} tolerance tolerated mean color distance, as a per mil (‰)
* @param {function} callback Will call to home with null in case there is no error, otherwise with the error itself
* @see FUZZY in http://www.imagemagick.org/script/command-line-options.php#metric
*/
assert.imageEqualsFile = function(buffer, referenceImageRelativeFilePath, tolerance, callback) {
if (!callback) callback = function(err) { if (err) throw err; };
file_b = path.resolve(file_b);
var file_a = '/tmp/windshaft-test-image-test.png'; // + (Math.random() * 1e16); // TODO: make predictable
var err = fs.writeFileSync(file_a, buffer, 'binary');
var referenceImageFilePath = path.resolve(referenceImageRelativeFilePath),
testImageFilePath = '/tmp/windshaft-test-image-' + (Math.random() * 1e16); // TODO: make predictable
var err = fs.writeFileSync(testImageFilePath, buffer, 'binary');
if (err) throw err;
var fuzz = tol + '%';
exec('compare -fuzz ' + fuzz + ' -metric AE "' + file_a + '" "' +
file_b + '" /dev/null', function(err, stdout, stderr) {
var imageMagickCmd = util.format(
'compare -metric fuzz "%s" "%s" /dev/null',
testImageFilePath, referenceImageFilePath
);
exec(imageMagickCmd, function(err, stdout, stderr) {
if (err) {
fs.unlinkSync(file_a);
fs.unlinkSync(testImageFilePath);
callback(err);
} else {
stderr = stderr.trim();
var similarity = parseFloat(stderr);
if ( similarity > 0 ) {
var err = new Error('Images not equal(' + similarity + '): ' +
file_a + ' ' + file_b);
err.similarity = similarity;
callback(err);
var metrics = stderr.match(/([0-9]*) \((.*)\)/);
if ( ! metrics ) {
callback(new Error("No match for " + stderr));
return;
}
var similarity = parseFloat(metrics[2]),
tolerancePerMil = (tolerance / 1000);
if (similarity > tolerancePerMil) {
err = new Error(util.format(
'Images %s and %s are not equal (got %d similarity, expected %d)',
testImageFilePath, referenceImageFilePath, similarity, tolerancePerMil)
);
err.similarity = similarity;
callback(err);
} else {
fs.unlinkSync(file_a);
callback(null);
fs.unlinkSync(testImageFilePath);
callback(null);
}
}
});