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<?php defined('SYSPATH') or die('No direct script access.');
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class Image_ImageMagick_Driver extends Image_Driver {
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// Directory that IM is installed in
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protected $dir = '';
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// Command extension (exe for windows)
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protected $ext = '';
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// Temporary image filename
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protected $tmp_image;
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/**
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* Attempts to detect the ImageMagick installation directory.
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*
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* @throws Kohana_Exception
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* @param array configuration
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* @return void
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*/
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public function __construct($config)
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{
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if (empty($config['directory']))
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{
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// Attempt to locate IM by using "which"
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if ( ! is_file($path = exec('which convert')))
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throw new Kohana_Exception('image.imagemagick.not_found');
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$config['directory'] = dirname($path);
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}
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// Set the command extension
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$this->ext = (PHP_SHLIB_SUFFIX === 'dll') ? '.exe' : '';
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// Check to make sure the provided path is correct
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if ( ! file_exists(realpath($config['directory']).'/convert'.$this->ext))
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throw new Kohana_Exception('image.imagemagick.not_found', 'convert'.$this->ext);
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// Set the installation directory
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$this->dir = str_replace('\\', '/', realpath($config['directory'])).'/';
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}
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/**
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* Creates a temporary image and executes the given actions. By creating a
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* temporary copy of the image before manipulating it, this process is atomic.
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*/
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public function process($image, $actions, $dir, $file)
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{
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// We only need the filename
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$image = $image['file'];
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// Unique temporary filename
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$this->tmp_image = $dir.'k2img--'.sha1(time().$dir.$file).substr($file, strrpos($file, '.'));
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// Copy the image to the temporary file
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copy($image, $this->tmp_image);
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// Quality change is done last
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$quality = (int) arr::remove('quality', $actions);
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// Use 95 for the default quality
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empty($quality) and $quality = 95;
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// All calls to these will need to be escaped, so do it now
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$this->cmd_image = escapeshellarg($this->tmp_image);
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$this->new_image = escapeshellarg($dir.$file);
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if ($status = $this->execute($actions))
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{
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// Use convert to change the image into it's final version. This is
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// done to allow the file type to change correctly, and to handle
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// the quality conversion in the most effective way possible.
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if ($error = exec(escapeshellcmd($this->dir.'convert'.$this->ext).' -quality '.$quality.'% '.$this->cmd_image.' '.$this->new_image))
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{
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$this->errors[] = $error;
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}
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}
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// Remove the temporary image
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unlink($this->tmp_image);
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$this->tmp_image = '';
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return $status;
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}
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public function crop($prop)
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{
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// Sanitize and normalize the properties into geometry
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$this->sanitize_geometry($prop);
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// Set the IM geometry based on the properties
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$geometry = escapeshellarg($prop['width'].'x'.$prop['height'].'+'.$prop['left'].'+'.$prop['top']);
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if ($error = exec(escapeshellcmd($this->dir.'convert'.$this->ext).' -crop '.$geometry.' '.$this->cmd_image.' '.$this->cmd_image))
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{
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$this->errors[] = $error;
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return FALSE;
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}
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return TRUE;
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}
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public function flip($dir)
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{
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// Convert the direction into a IM command
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$dir = ($dir === Image::HORIZONTAL) ? '-flop' : '-flip';
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if ($error = exec(escapeshellcmd($this->dir.'convert'.$this->ext).' '.$dir.' '.$this->cmd_image.' '.$this->cmd_image))
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{
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$this->errors[] = $error;
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return FALSE;
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}
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return TRUE;
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}
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public function resize($prop)
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{
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switch($prop['master'])
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{
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case Image::WIDTH: // Wx
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$dim = escapeshellarg($prop['width'].'x');
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break;
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case Image::HEIGHT: // xH
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$dim = escapeshellarg('x'.$prop['height']);
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break;
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case Image::AUTO: // WxH
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$dim = escapeshellarg($prop['width'].'x'.$prop['height']);
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break;
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case Image::NONE: // WxH!
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$dim = escapeshellarg($prop['width'].'x'.$prop['height'].'!');
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break;
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}
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// Use "convert" to change the width and height
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if ($error = exec(escapeshellcmd($this->dir.'convert'.$this->ext).' -resize '.$dim.' '.$this->cmd_image.' '.$this->cmd_image))
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{
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$this->errors[] = $error;
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return FALSE;
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}
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return TRUE;
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}
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public function rotate($amt)
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{
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if ($error = exec(escapeshellcmd($this->dir.'convert'.$this->ext).' -rotate '.escapeshellarg($amt).' -background transparent '.$this->cmd_image.' '.$this->cmd_image))
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{
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$this->errors[] = $error;
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return FALSE;
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}
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return TRUE;
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}
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public function sharpen($amount)
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{
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// Set the sigma, radius, and amount. The amount formula allows a nice
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// spread between 1 and 100 without pixelizing the image badly.
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$sigma = 0.5;
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$radius = $sigma * 2;
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$amount = round(($amount / 80) * 3.14, 2);
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// Convert the amount to an IM command
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$sharpen = escapeshellarg($radius.'x'.$sigma.'+'.$amount.'+0');
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if ($error = exec(escapeshellcmd($this->dir.'convert'.$this->ext).' -unsharp '.$sharpen.' '.$this->cmd_image.' '.$this->cmd_image))
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{
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$this->errors[] = $error;
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return FALSE;
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}
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return TRUE;
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}
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protected function properties()
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{
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return array_slice(getimagesize($this->tmp_image), 0, 2, FALSE);
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}
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} // End Image ImageMagick Driver
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