classes/Kohana/Image/Imagick.php

   1 <?php defined('SYSPATH') OR die('No direct script access.');
   2 /**
   3  * Support for image manipulation using [Imagick](http://php.net/Imagick).
   4  *
   5  * @package    Kohana/Image
   6  * @category   Drivers
   7  * @author     Tamas Mihalik tamas.mihalik@gmail.com
   8  * @copyright  (c) 2009-2012 Kohana Team
   9  * @license    http://kohanaphp.com/license.html
  10  */
  11 class Kohana_Image_Imagick extends Image {
  12
  13         /**
  14          * @var  Imagick  image magick object
  15          */
  16         protected $im;
  17
  18         /**
  19          * Checks if ImageMagick is enabled.
  20          *
  21          * @throws  Kohana_Exception
  22          * @return  boolean
  23          */
  24         public static function check()
  25         {
  26                 if ( ! extension_loaded('imagick'))
  27                 {
  28                         throw new Kohana_Exception('Imagick is not installed, or the extension is not loaded');
  29                 }
  30
  31                 return Image_Imagick::$_checked = TRUE;
  32         }
  33
  34         /**
  35          * Runs [Image_Imagick::check] and loads the image.
  36          *
  37          * @return  void
  38          * @throws  Kohana_Exception
  39          */
  40         public function __construct($file)
  41         {
  42                 if ( ! Image_Imagick::$_checked)
  43                 {
  44                         // Run the install check
  45                         Image_Imagick::check();
  46                 }
  47
  48                 parent::__construct($file);
  49
  50                 $this->im = new Imagick;
  51                 $this->im->readImage($file);
  52
  53                 if ( ! $this->im->getImageAlphaChannel())
  54                 {
  55                         // Force the image to have an alpha channel
  56                         $this->im->setImageAlphaChannel(Imagick::ALPHACHANNEL_SET);
  57                 }
  58         }
  59
  60         /**
  61          * Destroys the loaded image to free up resources.
  62          *
  63          * @return  void
  64          */
  65         public function __destruct()
  66         {
  67                 $this->im->clear();
  68                 $this->im->destroy();
  69         }
  70
  71         protected function _do_resize($width, $height)
  72         {
  73                 if ($this->im->scaleImage($width, $height))
  74                 {
  75                         // Reset the width and height
  76                         $this->width = $this->im->getImageWidth();
  77                         $this->height = $this->im->getImageHeight();
  78
  79                         return TRUE;
  80                 }
  81
  82                 return FALSE;
  83         }
  84
  85         protected function _do_crop($width, $height, $offset_x, $offset_y)
  86         {
  87                 if ($this->im->cropImage($width, $height, $offset_x, $offset_y))
  88                 {
  89                         // Reset the width and height
  90                         $this->width = $this->im->getImageWidth();
  91                         $this->height = $this->im->getImageHeight();
  92
  93                         // Trim off hidden areas
  94                         $this->im->setImagePage($this->width, $this->height, 0, 0);
  95
  96                         return TRUE;
  97                 }
  98
  99                 return FALSE;
 100         }
 101
 102         protected function _do_rotate($degrees)
 103         {
 104                 if ($this->im->rotateImage(new ImagickPixel('transparent'), $degrees))
 105                 {
 106                         // Reset the width and height
 107                         $this->width = $this->im->getImageWidth();
 108                         $this->height = $this->im->getImageHeight();
 109
 110                         // Trim off hidden areas
 111                         $this->im->setImagePage($this->width, $this->height, 0, 0);
 112
 113                         return TRUE;
 114                 }
 115
 116                 return FALSE;
 117         }
 118
 119         protected function _do_flip($direction)
 120         {
 121                 if ($direction === Image::HORIZONTAL)
 122                 {
 123                         return $this->im->flopImage();
 124                 }
 125                 else
 126                 {
 127                         return $this->im->flipImage();
 128                 }
 129         }
 130
 131         protected function _do_sharpen($amount)
 132         {
 133                 // IM not support $amount under 5 (0.15)
 134                 $amount = ($amount < 5) ? 5 : $amount;
 135
 136                 // Amount should be in the range of 0.0 to 3.0
 137                 $amount = ($amount * 3.0) / 100;
 138
 139                 return $this->im->sharpenImage(0, $amount);
 140         }
 141
 142         protected function _do_reflection($height, $opacity, $fade_in)
 143         {
 144                 // Clone the current image and flip it for reflection
 145                 $reflection = $this->im->clone();
 146                 $reflection->flipImage();
 147
 148                 // Crop the reflection to the selected height
 149                 $reflection->cropImage($this->width, $height, 0, 0);
 150                 $reflection->setImagePage($this->width, $height, 0, 0);
 151
 152                 // Select the fade direction
 153                 $direction = array('transparent', 'black');
 154
 155                 if ($fade_in)
 156                 {
 157                         // Change the direction of the fade
 158                         $direction = array_reverse($direction);
 159                 }
 160
 161                 // Create a gradient for fading
 162                 $fade = new Imagick;
 163                 $fade->newPseudoImage($reflection->getImageWidth(), $reflection->getImageHeight(), vsprintf('gradient:%s-%s', $direction));
 164
 165                 // Apply the fade alpha channel to the reflection
 166                 $reflection->compositeImage($fade, Imagick::COMPOSITE_DSTOUT, 0, 0);
 167
 168                 // NOTE: Using setImageOpacity will destroy alpha channels!
 169                 $reflection->evaluateImage(Imagick::EVALUATE_MULTIPLY, $opacity / 100, Imagick::CHANNEL_ALPHA);
 170
 171                 // Create a new container to hold the image and reflection
 172                 $image = new Imagick;
 173                 $image->newImage($this->width, $this->height + $height, new ImagickPixel);
 174
 175                 // Force the image to have an alpha channel
 176                 $image->setImageAlphaChannel(Imagick::ALPHACHANNEL_SET);
 177
 178                 // Force the background color to be transparent
 179                 // $image->setImageBackgroundColor(new ImagickPixel('transparent'));
 180
 181                 // Match the colorspace between the two images before compositing
 182                 $image->setColorspace($this->im->getColorspace());
 183
 184                 // Place the image and reflection into the container
 185                 if ($image->compositeImage($this->im, Imagick::COMPOSITE_SRC, 0, 0)
 186                 AND $image->compositeImage($reflection, Imagick::COMPOSITE_OVER, 0, $this->height))
 187                 {
 188                         // Replace the current image with the reflected image
 189                         $this->im = $image;
 190
 191                         // Reset the width and height
 192                         $this->width = $this->im->getImageWidth();
 193                         $this->height = $this->im->getImageHeight();
 194
 195                         return TRUE;
 196                 }
 197
 198                 return FALSE;
 199         }
 200
 201         protected function _do_watermark(Image $image, $offset_x, $offset_y, $opacity)
 202         {
 203                 // Convert the Image intance into an Imagick instance
 204                 $watermark = new Imagick;
 205                 $watermark->readImageBlob($image->render(), $image->file);
 206
 207                 if ($watermark->getImageAlphaChannel() !== Imagick::ALPHACHANNEL_ACTIVATE)
 208                 {
 209                         // Force the image to have an alpha channel
 210                         $watermark->setImageAlphaChannel(Imagick::ALPHACHANNEL_OPAQUE);
 211                 }
 212
 213                 if ($opacity < 100)
 214                 {
 215                         // NOTE: Using setImageOpacity will destroy current alpha channels!
 216                         $watermark->evaluateImage(Imagick::EVALUATE_MULTIPLY, $opacity / 100, Imagick::CHANNEL_ALPHA);
 217                 }
 218
 219                 // Match the colorspace between the two images before compositing
 220                 // $watermark->setColorspace($this->im->getColorspace());
 221
 222                 // Apply the watermark to the image
 223                 return $this->im->compositeImage($watermark, Imagick::COMPOSITE_DISSOLVE, $offset_x, $offset_y);
 224         }
 225
 226         protected function _do_background($r, $g, $b, $opacity)
 227         {
 228                 // Create a RGB color for the background
 229                 $color = sprintf('rgb(%d, %d, %d)', $r, $g, $b);
 230
 231                 // Create a new image for the background
 232                 $background = new Imagick;
 233                 $background->newImage($this->width, $this->height, new ImagickPixel($color));
 234
 235                 if ( ! $background->getImageAlphaChannel())
 236                 {
 237                         // Force the image to have an alpha channel
 238                         $background->setImageAlphaChannel(Imagick::ALPHACHANNEL_SET);
 239                 }
 240
 241                 // Clear the background image
 242                 $background->setImageBackgroundColor(new ImagickPixel('transparent'));
 243
 244                 // NOTE: Using setImageOpacity will destroy current alpha channels!
 245                 $background->evaluateImage(Imagick::EVALUATE_MULTIPLY, $opacity / 100, Imagick::CHANNEL_ALPHA);
 246
 247                 // Match the colorspace between the two images before compositing
 248                 $background->setColorspace($this->im->getColorspace());
 249
 250                 if ($background->compositeImage($this->im, Imagick::COMPOSITE_DISSOLVE, 0, 0))
 251                 {
 252                         // Replace the current image with the new image
 253                         $this->im = $background;
 254
 255                         return TRUE;
 256                 }
 257
 258                 return FALSE;
 259         }
 260
 261         protected function _do_save($file, $quality)
 262         {
 263                 // Get the image format and type
 264                 list($format, $type) = $this->_get_imagetype(pathinfo($file, PATHINFO_EXTENSION));
 265
 266                 // Set the output image type
 267                 $this->im->setFormat($format);
 268
 269                 // Set the output quality
 270                 $this->im->setImageCompressionQuality($quality);
 271
 272                 if ($this->im->writeImage($file))
 273                 {
 274                         // Reset the image type and mime type
 275                         $this->type = $type;
 276                         $this->mime = image_type_to_mime_type($type);
 277
 278                         return TRUE;
 279                 }
 280
 281                 return FALSE;
 282         }
 283
 284         protected function _do_render($type, $quality)
 285         {
 286                 // Get the image format and type
 287                 list($format, $type) = $this->_get_imagetype($type);
 288
 289                 // Set the output image type
 290                 $this->im->setFormat($format);
 291
 292                 // Set the output quality
 293                 $this->im->setImageCompressionQuality($quality);
 294
 295                 // Reset the image type and mime type
 296                 $this->type = $type;
 297                 $this->mime = image_type_to_mime_type($type);
 298
 299                 return (string) $this->im;
 300         }
 301
 302         /**
 303          * Get the image type and format for an extension.
 304          *
 305          * @param   string  $extension  image extension: png, jpg, etc
 306          * @return  string  IMAGETYPE_* constant
 307          * @throws  Kohana_Exception
 308          */
 309         protected function _get_imagetype($extension)
 310         {
 311                 // Normalize the extension to a format
 312                 $format = strtolower($extension);
 313
 314                 switch ($format)
 315                 {
 316                         case 'jpg':
 317                         case 'jpeg':
 318                                 $type = IMAGETYPE_JPEG;
 319                         break;
 320                         case 'gif':
 321                                 $type = IMAGETYPE_GIF;
 322                         break;
 323                         case 'png':
 324                                 $type = IMAGETYPE_PNG;
 325                         break;
 326                         default:
 327                                 throw new Kohana_Exception('Installed ImageMagick does not support :type images',
 328                                         array(':type' => $extension));
 329                         break;
 330                 }
 331
 332                 return array($format, $type);
 333         }
 334 } // End Kohana_Image_Imagick