added possibility to reset multiple times to a backup

src/Intervention/Image/Gd/Commands/ResetCommand.php

@@ -16,8 +16,12 @@ class ResetCommand extends \Intervention\Image\Commands\AbstractCommand
 
         if (is_resource($backup = $image->getBackup($backupName))) {
 
-            // destroy old resource
+            // destroy current resource
             imagedestroy($image->getCore());
+
+            // clone backup
+            $backup = $image->getDriver()->cloneCore($backup);
+
             // reset to new resource
             $image->setCore($backup);
 

src/Intervention/Image/Imagick/Commands/ResetCommand.php

@@ -18,9 +18,12 @@ class ResetCommand extends \Intervention\Image\Commands\AbstractCommand
 
         if ($backup instanceof \Imagick) {
 
-            // destroy old core
+            // destroy current core
             $image->getCore()->clear();
 
+            // clone backup
+            $backup = clone $backup;
+
             // reset to new resource
             $image->setCore($backup);
 

tests/GdSystemTest.php

@@ -1106,6 +1106,29 @@ class GdSystemTest extends PHPUnit_Framework_TestCase
         $this->assertTransparentPosition($img, 0, 0);
     }
 
+    public function testResetToNamed()
+    {
+        $img = $this->manager()->make('tests/images/tile.png');
+        $img->backup('original');
+        $img->resize(30, 20);
+        $img->backup('30x20');
+
+        // reset to original
+        $img->reset('original');
+        $this->assertEquals(16, $img->getWidth());
+        $this->assertEquals(16, $img->getHeight());
+
+        // reset to 30x20
+        // $img->reset('30x20');
+        // $this->assertEquals(30, $img->getWidth());
+        // $this->assertEquals(20, $img->getHeight());
+
+        // reset to original again
+        $img->reset('original');
+        $this->assertEquals(16, $img->getWidth());
+        $this->assertEquals(16, $img->getHeight());
+    }
+
     public function testLimitColors()
     {
        $img = $this->manager()->make('tests/images/trim.png');

tests/ImagickSystemTest.php

@@ -1081,6 +1081,29 @@ class ImagickSystemTest extends PHPUnit_Framework_TestCase
         $this->assertTransparentPosition($img, 0, 0);
     }
 
+    public function testResetToNamed()
+    {
+        $img = $this->manager()->make('tests/images/tile.png');
+        $img->backup('original');
+        $img->resize(30, 20);
+        $img->backup('30x20');
+
+        // reset to original
+        $img->reset('original');
+        $this->assertEquals(16, $img->getWidth());
+        $this->assertEquals(16, $img->getHeight());
+
+        // reset to 30x20
+        $img->reset('30x20');
+        $this->assertEquals(30, $img->getWidth());
+        $this->assertEquals(20, $img->getHeight());
+
+        // reset to original again
+        $img->reset('original');
+        $this->assertEquals(16, $img->getWidth());
+        $this->assertEquals(16, $img->getHeight());
+    }
+
     public function testLimitColors()
     {
        $img = $this->manager()->make('tests/images/trim.png');

tests/ResetCommandTest.php

@@ -15,7 +15,10 @@ class ResetCommandTest extends PHPUnit_Framework_TestCase
         $size = Mockery::mock('Intervention\Image\Size', array(800, 600));
         $resource = imagecreatefromjpeg(__DIR__.'/images/test.jpg');
         $image = Mockery::mock('Intervention\Image\Image');
+        $driver = Mockery::mock('Intervention\Image\Gd\Driver');
+        $driver->shouldReceive('cloneCore')->with($resource)->once()->andReturn($resource);
         $image->shouldReceive('getCore')->once()->andReturn($resource);
+        $image->shouldReceive('getDriver')->once()->andReturn($driver);
         $image->shouldReceive('setCore')->once();
         $image->shouldReceive('getBackup')->once()->andReturn($resource);
         $command = new ResetGd(array());
@@ -28,6 +31,9 @@ class ResetCommandTest extends PHPUnit_Framework_TestCase
         $size = Mockery::mock('Intervention\Image\Size', array(800, 600));
         $resource = imagecreatefromjpeg(__DIR__.'/images/test.jpg');
         $image = Mockery::mock('Intervention\Image\Image');
+        $driver = Mockery::mock('Intervention\Image\Gd\Driver');
+        $driver->shouldReceive('cloneCore')->with($resource)->once()->andReturn($resource);
+        $image->shouldReceive('getDriver')->once()->andReturn($driver);
         $image->shouldReceive('getCore')->once()->andReturn($resource);
         $image->shouldReceive('setCore')->once();
         $image->shouldReceive('getBackup')->once()->withArgs(array('fooBackup'))->andReturn($resource);