added bmp write support for Imagick driver

src/Intervention/Image/AbstractEncoder.php

@@ -60,6 +60,13 @@ abstract class AbstractEncoder
      */
     abstract protected function processTiff();
 
+    /**
+     * Processes and returns encoded image as BMP string
+     *
+     * @return string
+     */
+    abstract protected function processBmp();
+
     /**
      * Process a given image
      *
@@ -103,6 +110,13 @@ abstract class AbstractEncoder
                 $this->result = $this->processTiff();
                 break;
 
+            case 'bmp':
+            case 'image/bmp':
+            case 'image/x-windows-bmp':
+            case 'image/x-ms-bmp':
+                $this->result = $this->processBmp();
+                break;
+                
             default:
                 throw new \Intervention\Image\Exception\NotSupportedException(
                     "Encoding format ({$format}) is not supported."

src/Intervention/Image/Gd/Decoder.php

@@ -27,7 +27,6 @@ class Decoder extends \Intervention\Image\AbstractDecoder
         switch ($info[2]) {
             case IMAGETYPE_PNG:
                 $core = imagecreatefrompng($path);
-                // imagepalettetotruecolor($core);
                 $this->gdResourceToTruecolor($core);
                 break;
 
@@ -37,13 +36,12 @@ class Decoder extends \Intervention\Image\AbstractDecoder
 
             case IMAGETYPE_GIF:
                 $core = imagecreatefromgif($path);
-                // imagepalettetotruecolor($core);
                 $this->gdResourceToTruecolor($core);
                 break;
 
             default:
                 throw new \Intervention\Image\Exception\NotReadableException(
-                    "Unable to read image type. Only use JPG, PNG or GIF images with GD driver."
+                    "Unable to read image type. GD driver is only able to decode JPG, PNG or GIF files."
                 );
         }
 

src/Intervention/Image/Gd/Encoder.php

@@ -66,4 +66,16 @@ class Encoder extends \Intervention\Image\AbstractEncoder
             "TIFF format is not supported by Gd Driver."
         );
     }
+
+    /**
+     * Processes and returns encoded image as BMP string
+     *
+     * @return string
+     */
+    protected function processBmp()
+    {
+        throw new \Intervention\Image\Exception\NotSupportedException(
+            "BMP format is not supported by Gd Driver."
+        );
+    }
 }

src/Intervention/Image/Imagick/Encoder.php

@@ -87,4 +87,22 @@ class Encoder extends \Intervention\Image\AbstractEncoder
         return $imagick->getImagesBlob();
     }
 
+    /**
+     * Processes and returns encoded image as BMP string
+     *
+     * @return string
+     */
+    protected function processBmp()
+    {
+        $format = 'bmp';
+        $compression = \Imagick::COMPRESSION_UNDEFINED;
+
+        $imagick = $this->image->getCore();
+        $imagick->setFormat($format);
+        $imagick->setImageFormat($format);
+        $imagick->setCompression($compression);
+        $imagick->setImageCompression($compression);
+
+        return $imagick->getImagesBlob();
+    }
 }