Merge branch 'master' of github.com:Gregwar/Image

Adapter/GD.php

@@ -210,6 +210,55 @@ public function sepia()
         return $this;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function gaussianBlur($blurFactor = 1)
+    {
+        $blurFactor = round($blurFactor); // blurFactor has to be an integer
+
+        $originalWidth = $this->width();
+        $originalHeight = $this->height();
+
+        $smallestWidth = ceil($originalWidth * pow(0.5, $blurFactor));
+        $smallestHeight = ceil($originalHeight * pow(0.5, $blurFactor));
+
+        // for the first run, the previous image is the original input
+        $prevImage = $this->resource;
+        $prevWidth = $originalWidth;
+        $prevHeight = $originalHeight;
+
+        // scale way down and gradually scale back up, blurring all the way
+        for ($i = 0; $i < $blurFactor; ++$i) {
+            // determine dimensions of next image
+            $nextWidth = $smallestWidth * pow(2, $i);
+            $nextHeight = $smallestHeight * pow(2, $i);
+
+            // resize previous image to next size
+            $nextImage = imagecreatetruecolor($nextWidth, $nextHeight);
+            imagecopyresized($nextImage, $prevImage, 0, 0, 0, 0,
+                $nextWidth, $nextHeight, $prevWidth, $prevHeight);
+
+            // apply blur filter
+            imagefilter($nextImage, IMG_FILTER_GAUSSIAN_BLUR);
+
+            // now the new image becomes the previous image for the next step
+            $prevImage = $nextImage;
+            $prevWidth = $nextWidth;
+            $prevHeight = $nextHeight;
+        }
+
+        // scale back to original size and blur one more time
+        imagecopyresized($this->resource, $nextImage,
+            0, 0, 0, 0, $originalWidth, $originalHeight, $nextWidth, $nextHeight);
+        imagefilter($this->resource, IMG_FILTER_GAUSSIAN_BLUR);
+
+        // clean up
+        imagedestroy($prevImage);
+
+        return $this;
+    }
+
     /**
      * {@inheritdoc}
      */

Image.php

@@ -23,7 +23,7 @@
  * @method Image crop($x, $y, $width, $height)
  * @method Image enableProgressive()
  * @method Image force($width = null, $height = null, $background = 0xffffff)
- * @method Image zoomCrop($width, $height, $background = 0xffffff)
+ * @method Image zoomCrop($width, $height, $background = 0xffffff, $xPos, $yPos)
  * @method Image fillBackground($background = 0xffffff)
  * @method Image negate()
  * @method Image brightness($brightness)

tests/ImageTests.php

@@ -201,6 +201,20 @@ public function testCache()
         $this->assertSame(50, imagesy($i));
     }
 
+    /**
+     * Testing Gaussian blur filter.
+     */
+    public function testGaussianBlur()
+    {
+        $image = $this->open('monalisa.jpg')
+            ->gaussianBlur();
+        $secondImage = $this->open('monalisa.jpg')
+            ->gaussianBlur(5);
+
+        $this->assertTrue(file_exists($image));
+        $this->assertTrue(file_exists($secondImage));
+    }
+
     /**
      * Testing creating image from data.
      */