bmz_image_handler.class.php

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<?php
/**
 * bmz_image_handler.class.php
 * IH2 class for image manipulation
 *
 * @author  Tim Kroeger <[e-mail]>
 * @copyright Copyright 2005-2006 breakmyzencart.com
 * @license http://www.gnu.org/licenses/gpl.txt GNU General Public License V2.0
 * @version $Id: bmz_image_handler.class.php,v 1.8 2006/05/01 12:19:30 tim Exp $
 */

require_once('bmz_gif_info.class.php');

class ih_image{

	/**
   * $orig is the original image source passed to the constructor
   * $src = is the reference to an actual physical image
	 * $local is the cached image reference
	 */
  var $orig = null;
	var $src = null;
  var $local = null;
	var $filename;
	var $extension;
	var $width;
	var $height;
	var $sizetype;
	var $canvas;
	var $zoom;
	var $watermark;
  var $force_canvas;

/**
 * ih_image class constructor
 * @author Tim Kroeger ([e-mail])
 * @version 1.99
 * @param string $src Image source (e.g. - images/productimage.jpg)
 * @param string $width The image's width
 * @param string $height The image's height
 */

	function ih_image($src, $width, $height){
		global $ihConf;
		
    
    $this->orig = $src;
    $this->src = $src;
    $this->width = $width;
    $this->height = $height;
    
 		$this->determine_image_sizetype();
    
    if ((($this->sizetype == 'large') || ($this->sizetype == 'medium')) && $this->file_not_found()) {
      // large or medium image specified but not found. strip superflous suffix.
      // now we can actually access the default image referenced in the database.
		  $this->src = $this->strip_sizetype_suffix($this->src);
    }
		$this->filename = $ihConf['dir']['docroot'] . $this->src;
		$this->extension = substr($this->src, strrpos($this->src, '.'));

		list($newwidth, $newheight, $resize) = $this->calculate_size($this->width, $this->height);
		// set canvas dimensions
		if (($newwidth > 0) && ($newheight > 0)) {
			$this->canvas['width'] = $newwidth;
			$this->canvas['height'] = $newheight;
		}

		// initialize overlays (watermark, zoom overlay)
		$this->initialize_overlays($this->sizetype);
	} # end class constructor

  function file_not_found() {
    global $ihConf;
    // try to find file by using different file extensions if initial
    // source doesn't succeed
    if (is_file($ihConf['dir']['docroot'] . $this->src)) {
      return false;
    } else {
      // do a quick search for files with common extensions
      $extensions = array('.png', '.PNG', '.jpg', '.JPG', '.jpeg', '.JPEG', '.gif', '.GIF');
      $base = substr($this->src, 0, strrpos($this->src, '.'));
      for ($i=0; $i<count($extensions); $i++) {
        if (is_file($ihConf['dir']['docroot'] . $base . $extensions[$i])) {
          $this->src = $base . $extensions[$i];
          return false;
        }
      }
      // not found? maybe mixed case file extension?
      if ($ihConf['allow_mixed_case_ext']) {
        // this can cost some time for every displayed image so default is
        // to not do this search
        $directory = dirname($ihConf['dir']['docroot'] . $this->src);
        $dir = @dir($directory);
        while ($file = $dir->read()) {
          if (!is_dir($directory . $file)) {
            if(preg_match("/^" . $ihConf['dir']['docroot'] . $base . "/i", $file) == '1') {
              $file_ext = substr($file, strrpos($file, '.'));
              if (is_file($ihConf['dir']['docroot'] . $base . $file_ext)) {
                $this->src = $base . $file_ext;
                return false;
              } 
            }
          }
        }
      }
    }
    // still here? no file found...
    return true;
  }
  
  function is_real() {
    // return true if the source images are really present and medium
    // or large are not just a descendant from the default image.
    // small default images always return true.
    
    // strip file extensions, they don't matter
    $orig = substr($this->orig, 0, strrpos($this->orig, '.'));
    $src = substr($this->src, 0, strrpos($this->src, '.'));
    return ($orig == $src);
  }

	function determine_image_sizetype() {
		global $ihConf;
		
		if (strstr($this->src, $ihConf['large']['suffix'])) {
			$this->sizetype = 'large';
		} elseif (strstr($this->src, $ihConf['medium']['suffix'])) {
			$this->sizetype = 'medium';
		} elseif ((intval($this->width) == intval($ihConf['small']['width'])) && (intval($this->height) == intval($ihConf['small']['height']))) {
			$this->sizetype = 'small';
		} else
		$this->sizetype = 'generic';
	}

	function strip_sizetype_suffix($src) {
    global $ihConf;
		$src = preg_replace('/' . $ihConf['large']['suffix'] . '\./', '.', $src);
		$src = preg_replace('/' . $ihConf['medium']['suffix'] . '\./', '.', $src);
		$src = str_replace($ihConf['medium']['prefix'] . '/', '/', $src);
		$src = str_replace($ihConf['large']['prefix'] . '/', '/', $src);
    return $src;
	}
	
	function initialize_overlays($sizetype) {
		global $ihConf;
		
		switch ($sizetype) {
			case 'large':
				$this->watermark['file'] = ($ihConf['large']['watermark']) ? $ihConf['dir']['docroot'] . $ihConf['dir']['images'] . 'large/watermark' . $ihConf['large']['suffix'] . '.png' : '';
				$this->zoom['file'] = ($ihConf['large']['zoom']) ? $ihConf['dir']['docroot'] . $ihConf['dir']['images'] . 'large/zoom' . $ihConf['large']['suffix'] . '.png' : '';
				break;
			case 'medium':
				$this->watermark['file'] = ($ihConf['medium']['watermark']) ? $ihConf['dir']['docroot'] . $ihConf['dir']['images'] . 'medium/watermark' . $ihConf['medium']['suffix'] . '.png': '';
				$this->zoom['file'] = ($ihConf['medium']['zoom']) ? $ihConf['dir']['docroot'] . $ihConf['dir']['images'] . 'medium/zoom' . $ihConf['medium']['suffix'] . '.png' : '';
				break;
			case 'small':
				$this->watermark['file'] = ($ihConf['small']['watermark']) ? $ihConf['dir']['docroot'] . $ihConf['dir']['images'] . 'watermark.png' : '';
				$this->zoom['file'] = ($ihConf['small']['zoom']) ? $ihConf['dir']['docroot'] . $ihConf['dir']['images'] . 'zoom.png' : '';
				break;
			default:
				$this->watermark['file'] = '';
				$this->zoom['file'] = '';
				break;
		}

		if (($this->watermark['file'] != '') && is_file($this->watermark['file'])) {
		// set watermark parameters
			list($this->watermark['width'], $this->watermark['height']) = @getimagesize($this->watermark['file']);
			list($this->watermark['startx'], $this->watermark['starty']) = $this->calculate_gravity($this->canvas['width'], $this->canvas['height'], $this->watermark['width'], $this->watermark['height'], $ihConf['watermark']['gravity']);
			//echo '(' . $this->watermark['startx'] . ', ' . $this->watermark['starty'] . ') ' . $this->watermark['width'] . 'x' . $this->watermark['height'] . '<br />';
		} else {
			$this->watermark['file'] = '';
		}
		
		if (($this->zoom['file'] != '') && is_file($this->zoom['file'])) {
		// set zoom parameters
			list($this->zoom['width'], $this->zoom['height']) = @getimagesize($this->zoom['file']);
			list($this->zoom['startx'], $this->zoom['starty']) = $this->calculate_gravity($this->canvas['width'], $this->canvas['height'], $this->zoom['width'], $this->zoom['height'], $ihConf['zoom']['gravity']);
			//echo '(' . $this->zoom['startx'] . ', ' . $this->zoom['starty'] . ') ' . $this->zoom['width'] . 'x' . $this->zoom['height'] . '<br />';
		} else {
			$this->zoom['file'] = '';
		}
	}
	
	function get_local() {
		if ($this->local) return $this->local;
		// check if image handler is available and if we should resize at all
		if ($this->resizing_allowed()) {
			$this->local = $this->get_resized_image($this->width, $this->height);
		} else {
      $this->local = $this->src;
    }
		return $this->local;
	}

  function resizing_allowed() {
    global $bmzConf;
    global $ihConf;
    // only resize if resizing is turned on
    // don't resize template images so test for the configured images directory.
    // if $ihConf['noresize_key'] is found within the string, don't resize either.
    $allowed = false;
    if ($ihConf['resize'] && 
        ((strpos($this->src, $ihConf['dir']['images']) === 0) || 
         ((strpos($this->src, substr($bmzConf['cachedir'], strlen($ihConf['dir']['docroot']))) === 0))) &&
        (strpos($this->src, $ihConf['noresize_key']) === false)) {
      $allowed = true;
      for ($i=0; $i++; $i<count($ihConf)) {
        $allowed &= (strpos($this->src, $ihConf['dir']['images'] . $ihConf['noresize_dirs'][$i] . '/') !== 0);
      }
    }
    return $allowed;
  }

	function get_resized_image($width, $height, $override_sizetype = '', $filetype = '') {
		global $ihConf;

		$sizetype = ($override_sizetype == '') ? $this->sizetype : $override_sizetype;
		switch ($sizetype) {
      case 'large':
        $file_extension = (($ihConf['large']['filetype'] == 'no_change') ? $this->extension : '.' . $ihConf['large']['filetype']);
        $background = $ihConf['large']['bg'];
        $quality = $ihConf['large']['quality'];
        $width = $ihConf['large']['width'];
        $height = $ihConf['large']['height'];
        break;
      case 'medium':
        $file_extension = (($ihConf['medium']['filetype'] == 'no_change') ? $this->extension : '.' . $ihConf['medium']['filetype']);
        $background = $ihConf['medium']['bg'];
        $quality = $ihConf['medium']['quality'];
        break;
      case 'small':
        $file_extension = (($ihConf['small']['filetype'] == 'no_change') ? $this->extension : '.' . $ihConf['small']['filetype']);
        $background = $ihConf['small']['bg'];
        $quality = $ihConf['small']['quality'];