add perf/size test for Jdenticons

tst/IconTest

@@ -9,6 +9,7 @@ use Identicon\Generator\GdGenerator;
 use Identicon\Generator\ImageMagickGenerator;
 use Identicon\Generator\SvgGenerator;
 use Identicon\Identicon;
+use Jdenticon\Identicon as Jdenticon;
 use PrivateBin\Vizhash16x16;
 
 
@@ -17,7 +18,18 @@ $vizhash = new Vizhash16x16();
 $identiconGenerators = array(
     'identicon GD' => new Identicon(new GdGenerator()),
     'identicon ImageMagick' => new Identicon(new ImageMagickGenerator()),
-    'identicon SVG' => new Identicon(new SvgGenerator())
+    'identicon SVG' => new Identicon(new SvgGenerator()),
+);
+$jdenticon = new Jdenticon(array(
+    'size'  => 16,
+    'style' => array(
+        'backgroundColor'   => '#fff0', // fully transparent, for dark mode
+        'padding'           => 0,
+    ),
+));
+$jdenticonGenerators = array(
+    'jdenticon GD' => 'png',
+    'jdenticon SVG' => 'svg',
 );
 $results = array(
     'vizhash' => array(
@@ -35,21 +47,26 @@ $results = array(
     'identicon SVG' => array(
         'lengths' => array(),
         'time' => 0
-    )
+    ),
+    'jdenticon GD' => array(
+        'lengths' => array(),
+        'time' => 0
+    ),
+    'jdenticon SVG' => array(
+        'lengths' => array(),
+        'time' => 0
+    ),
 );
 $hmacs = array();
 
 echo 'generate ', ITERATIONS, ' hmacs and pre-populate the result array, so tests wont be slowed down', PHP_EOL;
 for ($i = 0; $i < ITERATIONS; ++$i) {
     $hmacs[$i] = hash_hmac('sha512', '127.0.0.1', bin2hex(random_bytes(256)));
-    $results['vizhash']['lengths'][$i] = 0;
-    $results['identicon GD']['lengths'][$i] = 0;
-    $results['identicon ImageMagick']['lengths'][$i] = 0;
-    $results['identicon SVG']['lengths'][$i] = 0;
+    foreach (array_keys($results) as $test) {
+        $results[$test]['lengths'][$i] = 0;
+    }
 }
 
-
-
 echo 'run vizhash tests', PHP_EOL;
 $start = microtime(true);
 foreach ($hmacs as $i => $hmac) {
@@ -60,7 +77,6 @@ foreach ($hmacs as $i => $hmac) {
 }
 $results['vizhash']['time'] = microtime(true) - $start;
 
-
 foreach ($identiconGenerators as $key => $identicon) {
     echo 'run ', $key,' tests', PHP_EOL;
     $start = microtime(true);
@@ -71,9 +87,30 @@ foreach ($identiconGenerators as $key => $identicon) {
     $results[$key]['time'] = microtime(true) - $start;
 }
 
+foreach ($jdenticonGenerators as $key => $format) {
+    echo 'run ', $key,' tests', PHP_EOL;
+    $start = microtime(true);
+    foreach ($hmacs as $i => $hmac) {
+        $jdenticon->setHash($hmac);
+        $data = $jdenticon->getImageDataUri($format);
+        $results[$key]['lengths'][$i] = strlen($data);
+    }
+    $results[$key]['time'] = microtime(true) - $start;
+}
 
 
-define('PADDING_LENGTH', max(array_map(function ($key) { return strlen($key); }, array_keys($results))) + 1);
+define(
+    'PADDING_LENGTH',
+    max(
+        array_map(
+            function ($key) {
+                return strlen($key);
+            },
+            array_keys($results)
+        )
+    ) + 1
+);
+
 function format_result_line($generator, $min, $max, $avg, $sec) {
     echo str_pad($generator, PADDING_LENGTH, ' '), "\t",
         str_pad($min, 4, ' ', STR_PAD_LEFT), "\t",
@@ -84,7 +121,10 @@ function format_result_line($generator, $min, $max, $avg, $sec) {
 
 echo PHP_EOL;
 format_result_line('Generator:', 'min', 'max', 'avg', 'seconds');
-format_result_line(str_repeat('─', PADDING_LENGTH), str_repeat('─', 4), str_repeat('─', 4), str_repeat('─', 4), str_repeat('─', 7));
+format_result_line(
+    str_repeat('─', PADDING_LENGTH), str_repeat('─', 4), str_repeat('─', 4),
+    str_repeat('─', 4), str_repeat('─', 7)
+);
 foreach ($results as $generator => $result) {
     sort($result['lengths']);
     format_result_line(