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<?php /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 foldmethod=marker / /* * This is a driver file contains the Image_Tools_Thumbnail class * * PHP versions 4 and 5 * * LICENSE: * * Copyright (c) 2006-2008 Ildar N. Shaimordanov <ildar-sh@mail.ru> * * This source file is subject to the BSD License license that is bundled * with this package in the file LICENSE.txt. * It is also available through the world-wide-web at this URL: * http://www.opensource.org/licenses/bsd-license.php * If you did not receive a copy of the license and are unable to * obtain it through the world-wide-web, please send an email * to pear-dev@list.php.net so we can send you a copy immediately. * * @category Images * @package Image_Tools * @author Ildar N. Shaimordanov <ildar-sh@mail.ru> * @copyright Copyright (c) 2006-2008 Ildar N. Shaimordanov <ildar-sh@mail.ru> * @license http://www.opensource.org/licenses/bsd-license.php * BSD License * @version CVS: $Id: Thumbnail.php,v 1.8 2008/05/26 06:26:17 firman Exp $ * @since File available since Release 0.4.0 / /* * Image_Tools / require_once 'Image/Tools.php'; /* * Image_Tools_Utils / require_once 'Image/Tools/Utils.php'; // {{{ Constants /* * Maximal scaling / define('IMAGE_TOOLS_THUMBNAIL_METHOD_SCALE_MAX', 0); /* * Minimal scaling / define('IMAGE_TOOLS_THUMBNAIL_METHOD_SCALE_MIN', 1); /* * Cropping of fragment / define('IMAGE_TOOLS_THUMBNAIL_METHOD_CROP', 2); /* * Align constants / define('IMAGE_TOOLS_THUMBNAIL_ALIGN_CENTER', 0); define('IMAGE_TOOLS_THUMBNAIL_ALIGN_LEFT', -1); define('IMAGE_TOOLS_THUMBNAIL_ALIGN_RIGHT', +1); define('IMAGE_TOOLS_THUMBNAIL_ALIGN_TOP', -1); define('IMAGE_TOOLS_THUMBNAIL_ALIGN_BOTTOM', +1); // }}} // {{{ Class: Image_Tools_Thumbnail /* * This class provide thumbnail creating tool for manipulating an image * * @category Images * @package Image_Tools * @author Ildar N. Shaimordanov <ildar-sh@mail.ru> * @copyright Copyright (c) 2006-2008 Ildar N. Shaimordanov <ildar-sh@mail.ru> * @license http://www.opensource.org/licenses/bsd-license.php * BSD License * @version Release: 1.0.0RC1 * @since Class available since Release 0.4.0 / class Image_Tools_Thumbnail extends Image_Tools { // {{{ Properties /* * Thumbnail options: * <pre> * image mixed Destination image, a filename or an image string data or a GD image resource * width int Width of thumbnail * height int Height of thumbnail * percent number Size of thumbnail per size of original image * method int Method of thumbnail creating * halign int Horizontal align * valign int Vertical align * </pre> * * @var array * @access protected / var $options = array( 'image' => null, 'width' => 100, 'height' => 100, 'percent' => 0, 'method' => IMAGE_TOOLS_THUMBNAIL_METHOD_SCALE_MAX, 'halign' => IMAGE_TOOLS_THUMBNAIL_ALIGN_CENTER, 'valign' => IMAGE_TOOLS_THUMBNAIL_ALIGN_CENTER, ); /* * Available options for Image_Tools_Thumbnail * * @var array * @access protected / var $availableOptions = array( 'image' => 'mixed', 'width' => 'int', 'height' => 'int', 'percent' => 'number', 'method' => 'int', 'halign' => 'int', 'valign' => 'int', ); /* * Image_Tools_Thumbnail API version. * * @var string * @access protected / var $version = '1.0'; /* * Image info. * * @var resource * @access protected / var $imageInfo = null; // }}} // {{{ preRender() /* * Function which called before render. * * @return bool\|PEAR_Error TRUE on success or PEAR_Error on failure. * @access protected * @see Image_Tools::createImage() / function preRender() { // Create the source image $res = Image_Tools::createImage($this->options['image']); if ( PEAR::isError($res) ) { return $res; } $this->resultImage = $res; $this->_init(); } // }}} // {{{ postRender() /* * Function which called after render. * * @return bool\|PEAR_Error TRUE on success or PEAR_Error on failure. * @access protected * @see render() / function postRender() { $this->_init(); } // }}} // {{{ render() /* * Draw thumbnail result to resource. * * @return bool\|PEAR_Error TRUE on success or PEAR_Error on failure. * @access public / function render() { if (!Image_Tools::isGDImageResource($this->resultImage)) { return PEAR::raiseError('Invalid image resource'); } // Estimate a rectangular portion of the source image and a size of the target image if ($this->options['method'] == IMAGE_TOOLS_THUMBNAIL_METHOD_CROP) { if ( $this->options['percent'] ) { $W = floor($this->options['percent'] / 100 $this->imageInfo['width']); $H = floor($this->options['percent'] / 100 * $this->imageInfo['height']); } else { $W = $this->options['width']; $H = $this->options['height']; } $width = $W; $height = $H; $Y = $this->_coord('valign', 'height', $H); $X = $this->_coord('halign', 'width', $W); } else { $W = $this->imageInfo['width']; $H = $this->imageInfo['height']; $X = 0; $Y = 0; if ($this->options['percent']) { $width = floor($this->options['percent'] / 100 * $W); $height = floor($this->options['percent'] / 100 * $H); } else { $width = $this->options['width']; $height = $this->options['height']; if ($this->options['method'] == IMAGE_TOOLS_THUMBNAIL_METHOD_SCALE_MIN) { $Ww = $W / $width; $Hh = $H / $height; if ( $Ww > $Hh ) { $W = floor($width * $Hh); $X = $this->_coord('halign', 'width', $W); } else { $H = floor($height * $Ww); $Y = $this->_coord('valign', 'height', $H); } } else { if ( $H > $W ) { $width = floor($height / $H * $W); } else { $height = floor($width / $W * $H); } } } } // Create the target image if (function_exists('imagecreatetruecolor')) { $target = imagecreatetruecolor($width, $height); } else { $target = imagecreate($width, $height); } if (!Image_Tools::isGDImageResource($target)) { return PEAR::raiseError('Cannot initialize new GD image stream'); } // enable transparency if supported if (Image_Tools_Utils::compareGDVersion('2.0.28', '>=')) { // imagealphablending() and imagesavealpha() requires GD 2.0.38 imagealphablending($target, false); imagesavealpha($target, true); } // Copy the source image to the target image if ($this->options['method'] == IMAGE_TOOLS_THUMBNAIL_METHOD_CROP) { $result = imagecopy($target, $this->resultImage, 0, 0, $X, $Y, $W, $H); } elseif (function_exists('imagecopyresampled')) { $result = imagecopyresampled($target, $this->resultImage, 0, 0, $X, $Y, $width, $height, $W, $H); } else { $result = imagecopyresized($target, $this->resultImage, 0, 0, $X, $Y, $width, $height, $W, $H); } if (!$result) { return PEAR::raiseError('Cannot resize image'); } // Free a memory from the source image and save the resulting thumbnail imagedestroy($this->resultImage); $this->resultImage = $target; return true; } // }}} // {{{ _init() /** * Initialization function. / function _init() { $this->imageInfo = array( 'width' => imagesx($this->resultImage), 'height' => imagesy($this->resultImage), ); } // }}} // {{{ _coord() /* * Calculate the right coordinate depend on alignment. * * @param string $align Direction of alignment (halign or valign). * @param string $param Parameter (width or height) * @param integer $src Source value * * @return integer * @access private / function _coord($align, $param, $src) { if ($this->options[$align] < IMAGE_TOOLS_THUMBNAIL_ALIGN_CENTER) { $result = 0; } elseif ($this->options[$align] > IMAGE_TOOLS_THUMBNAIL_ALIGN_CENTER) { $result = $this->imageInfo[$param] - $src; } else { $result = ($this->imageInfo[$param] - $src) >> 1; } return $result; } // }}} } // }}} / * Local variables: * mode: php * tab-width: 4 * c-basic-offset: 4 * c-hanging-comment-ender-p: nil * End: */ ?>

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