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image.compare returns the % difference against the reference image

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As canvas can differ from one implementation to another make tests
to have a tolerance to differences.
This commit is contained in:
Raul Ochoa 2015-03-04 18:53:06 +01:00
parent ddffe412c6
commit 916871365f
2 changed files with 5 additions and 3 deletions
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6
test/acceptance/renderer/point.js
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@ -3,6 +3,8 @@ var image = require('../../support/image');
QUnit.module('renderer/point'); QUnit.module('renderer/point');
var IMAGE_DIFF_TOLERANCE = 4 / 100;
asyncTest('navy example', function(assert) { asyncTest('navy example', function(assert) {
var cartocss = [ var cartocss = [
'Map {', 'Map {',
@ -33,7 +35,7 @@ asyncTest('navy example', function(assert) {
pointRenderer.getTile('default_navy_3-3-2.torque.json', cartocss, 3, 3, 2, step, function(err, canvas) { pointRenderer.getTile('default_navy_3-3-2.torque.json', cartocss, 3, 3, 2, step, function(err, canvas) {
assert.ok(!err, 'no error while getting tile'); assert.ok(!err, 'no error while getting tile');
var imageDiff = image.compare(canvas.toBuffer(), 'default_navy_3-3-2.png'); var imageDiff = image.compare(canvas.toBuffer(), 'default_navy_3-3-2.png');
assert.equal(imageDiff, 0, 'navy tile is ok'); assert.ok(imageDiff < IMAGE_DIFF_TOLERANCE, 'navy tile is ok');
QUnit.start(); QUnit.start();
}); });
}); });
@ -58,7 +60,7 @@ asyncTest('basic heatmap', function(assert) {
pointRenderer.getTile('heatmap_navy_3-2-3.torque.json', cartocss, 3, 2, 3, step, function(err, canvas) { pointRenderer.getTile('heatmap_navy_3-2-3.torque.json', cartocss, 3, 2, 3, step, function(err, canvas) {
assert.ok(!err, 'no error while getting tile'); assert.ok(!err, 'no error while getting tile');
var imageDiff = image.compare(canvas.toBuffer(), 'heatmap_navy_3-2-3.png'); var imageDiff = image.compare(canvas.toBuffer(), 'heatmap_navy_3-2-3.png');
assert.equal(imageDiff, 0, 'heatmap tile is ok'); assert.ok(imageDiff < IMAGE_DIFF_TOLERANCE, 'heatmap tile is ok');
QUnit.start(); QUnit.start();
}); });
}); });

2
test/support/image.js
View File

@ -5,7 +5,7 @@ function compare(buffer, fixtureRelPath) {
var img = new mapnik.Image.fromBytesSync(buffer); var img = new mapnik.Image.fromBytesSync(buffer);
var reference = new mapnik.Image.openSync(__dirname + '/../fixtures/image/' + fixtureRelPath); var reference = new mapnik.Image.openSync(__dirname + '/../fixtures/image/' + fixtureRelPath);
return img.compare(reference); return img.compare(reference) / (reference.width() * reference.height());
} }
function save(path, buffer) { function save(path, buffer) {