add jpeg interlaced support

src/Engine/PhpGd/Helper/ResourceHelper.php

@@ -126,6 +126,9 @@ public function getContentsFromGdResource($format, $resource, array $options = [
                 break;
             case PhpGdContext::FORMAT_JPEG:
                 $quality = isset($options['jpeg_quality']) ? $options['jpeg_quality'] : 100;
+                if (isset($options['jpeg_interlace'])) {
+                    imageinterlace($resource, $options['jpeg_interlace']);
+                }
                 $success = @imagejpeg($resource, null, $quality);
                 break;
             case PhpGdContext::FORMAT_GIF:

src/OptionPass/JpegInterlaceOptionPass.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Imagecraft\OptionPass;
+
+/**
+ * @author Xianghan Wang <coldume@gmail.com>
+ * @since  1.0.0
+ */
+class JpegInterlaceOptionPass implements OptionPassInterface
+{
+    /**
+     * @inheritDoc
+     */
+    public function process(array $options)
+    {
+        if (
+            !isset($options['jpeg_interlace']) ||
+            !is_bool($options['jpeg_interlace'])
+        ) {
+            $options['jpeg_interlace'] = false;
+        }
+
+        return $options;
+    }
+}

tests/OptionPass/JpegInterlaceOptionPassTest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Imagecraft\OptionPass;
+
+/**
+ * @covers Imagecraft\OptionPass\JpegQualityOptionPass
+ */
+class JpegInterlaceOptionPassTest extends \PHPUnit_Framework_TestCase
+{
+    protected $pass;
+
+    public function setUp()
+    {
+        $this->pass = $this->getMock('Imagecraft\\OptionPass\\JpegInterlaceOptionPass', null);
+    }
+
+    public function testProcess()
+    {
+        $option = $this->pass->process([]);
+        $this->assertEquals(false, $option['jpeg_interlace']);
+
+        $option = $this->pass->process(['jpeg_interlace' => true]);
+        $this->assertEquals(true, $option['jpeg_interlace']);
+
+        $option = $this->pass->process(['jpeg_interlace' => false]);
+        $this->assertEquals(false, $option['jpeg_interlace']);
+
+        $option = $this->pass->process(['jpeg_interlace' => 10]);
+        $this->assertEquals(false, $option['jpeg_interlace']);
+    }
+}