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File: GdToolkitHelper.class
<?php
/*
 * Gallery - a web based photo album viewer and editor
 * Copyright (C) 2000-2007 Bharat Mediratta
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
 */

/**
 * A helper class for GdToolkit
 * @package Gd
 * @subpackage Classes
 * @author Ernesto Baschny <ernst@baschny.de>
 * @version $Revision: 15513 $
 * @static
 */
class GdToolkitHelper {

    /**
     * Figure out what operations and properties are supported by the
     * image* functions in the PHP installation and return them.
     *
     * @param object a $gd GdFunctionality-object to work with
     * @return object GalleryStatus a status code
     *	 array('operations' => ...
     *	       'properties' => ...)
     */
    function getOperationsAndProperties($gd=null) {
	global $gallery;

	if (!isset($gd)) {
	    $gd =& GdToolkitHelper::getGdFunctionality();
	}

	list ($ret, $isSupported) = GdToolkitHelper::isGdVersionSupported(null, $gd);
	if ($ret) {
	    return array($ret, null);
	}
	if (! $isSupported) {
	    return array(null, array('operations' => array(), 'properties' => array()));
	}

	list ($ret, $mimeTypes) = GdToolkitHelper::discoverMimeTypes($gd);
	if ($ret) {
	    return array($ret, null);
	}

	/* -------------------- Operations -------------------- */

	if (GdToolkitHelper::isOperationSupported('convert-to-image/jpeg', $gd)) {
	    $convertToJpegMimeTypes = array_intersect(
		array('image/gif', 'image/vnd.wap.wbmp',
		      'image/x-xbitmap', 'image/x-xpixmap'), $mimeTypes);
	    if (!empty($convertToJpegMimeTypes)) {
		$operations['convert-to-image/jpeg']['params'] = array();
		$operations['convert-to-image/jpeg']['description'] =
		    $gallery->i18n('Convert to a JPEG');
		$operations['convert-to-image/jpeg']['mimeTypes'] = $mimeTypes;
		$operations['convert-to-image/jpeg']['outputMimeType'] = 'image/jpeg';
	    }
	}

	if (GdToolkitHelper::isOperationSupported('scale', $gd)) {
	    /* Scale */
	    $operations['scale']['params'][] = array('type' => 'int', 'description' =>
		    $gallery->i18n('target width (# pixels or #% of full size)', false));
	    $operations['scale']['params'][] = array('type' => 'int', 'description' =>
		    $gallery->i18n('(optional) target height, defaults to same as width'));
	    $operations['scale']['description'] =
		$gallery->i18n('Scale the image to the target size, maintain aspect ratio');
	    $operations['scale']['mimeTypes'] = $mimeTypes;
	}

	if (GdToolkitHelper::isOperationSupported('thumbnail', $gd)
		&& isset($operations['scale'])) {
	    /* Thumbnail is an alias for scale */
	    $operations['thumbnail'] = $operations['scale'];
	}

	if (GdToolkitHelper::isOperationSupported('resize', $gd)) {
	    /* Resize */
	    $operations['resize']['params'][] = array('type' => 'int', 'description' =>
		    $gallery->i18n('target width (# pixels or #% of full size)', false));
	    $operations['resize']['params'][] = array('type' => 'int', 'description' =>
		    $gallery->i18n('target height (# pixels or #% of full size)', false));
	    $operations['resize']['description'] =
		$gallery->i18n('Resize the image to the target dimensions');
	    $operations['resize']['mimeTypes'] = $mimeTypes;
	}

	if (GdToolkitHelper::isOperationSupported('rotate', $gd)) {
	    /* Rotate */
	    $operations['rotate']['params'][] =
		array('type' => 'int',
		      'description' => $gallery->i18n('rotation degrees'));
	    $operations['rotate']['description'] = $gallery->i18n('Rotate the image');
	    $operations['rotate']['mimeTypes'] = $mimeTypes;
	}

	if (GdToolkitHelper::isOperationSupported('crop', $gd)) {
	    /* Crop */
	    $operations['crop']['params'][] = array('type' => 'float',
						    'description' => $gallery->i18n('left edge %'));
	    $operations['crop']['params'][] = array('type' => 'float',
						    'description' => $gallery->i18n('top edge %'));
	    $operations['crop']['params'][] = array('type' => 'float',
						    'description' => $gallery->i18n('width %'));
	    $operations['crop']['params'][] = array('type' => 'float',
						    'description' => $gallery->i18n('height %'));
	    $operations['crop']['description'] = $gallery->i18n('Crop the image');
	    $operations['crop']['mimeTypes'] = $mimeTypes;
	}

	if (GdToolkitHelper::isOperationSupported('composite', $gd)) {
	    /* Composite */
	    $operations['composite']['params'][] =
		array('type' => 'string',
		      'description' => $gallery->i18n('overlay path'));
	    $operations['composite']['params'][] =
		array('type' => 'string',
		      'description' => $gallery->i18n('overlay mime type'));
	    $operations['composite']['params'][] =
		array('type' => 'int',
		      'description' => $gallery->i18n('overlay width'));
	    $operations['composite']['params'][] =
		array('type' => 'int',
		      'description' => $gallery->i18n('overlay height'));
	    $operations['composite']['params'][] =
		array('type' => 'string',
		      'description' => $gallery->i18n('alignment type'));
	    $operations['composite']['params'][] =
		array('type' => 'int',
		      'description' => $gallery->i18n('alignment x %'));
	    $operations['composite']['params'][] =
		array('type' => 'int',
		      'description' => $gallery->i18n('alignment y %'));
	    $operations['composite']['description'] =
		$gallery->i18n('Overlay source image with a second one');
	    $operations['composite']['mimeTypes'] = $mimeTypes;
	}

	/* Compress */
	$qualityMimeTypes = array_intersect(array('image/jpeg'), $mimeTypes);
	if (!empty($qualityMimeTypes)) {
	    $operations['compress'] = array(
		'params' => array(array('type' => 'int',
					 'description' => $gallery->i18n('target size in kb'))),
		'description' => $gallery->i18n('Reduce image quality to reach target file size'),
		'mimeTypes' => $qualityMimeTypes);
	}

	/* -------------------- Properties -------------------- */

	/* Dimensions */
	$properties['dimensions']['type'] = 'int,int';
	$properties['dimensions']['description'] =
	    $gallery->i18n('Get the width and height of the image');
	$mimeTypes[] = 'application/x-shockwave-flash'; /* Supported by php getimagesize */
	$properties['dimensions']['mimeTypes'] = $mimeTypes;

	return array(null, array('operations' => $operations,
						     'properties' => $properties));
    }

    /**
     * Checks if a certain operation is supported by this GD library
     * @return boolean
     */
    function isOperationSupported($operation, $gd=null) {
	if (!isset($gd)) {
	    $gd =& GdToolkitHelper::getGdFunctionality();
	}
	switch ($operation) {
	case 'scale':
	case 'thumbnail':
	case 'resize':
	case 'crop':
	case 'composite':
	    /* We can always do these */
	    return true;
	    break;
	case 'convert-to-image/jpeg':
	case 'compress':
	    return $gd->functionExists('imageJpeg');
	    break;
	case 'rotate':
	    return $gd->functionExists('imageRotate');
	    break;
	default:
	    return false;
	    break;
	}
    }

    /**
     * The minimal version of GD that this module supports
     * @return string A version string
     */
    function minGdVersion() {
	return '2.0';
    }

    /**
     * Find out which version of GD is compiled in this PHP-environment
     *
     * This is ugly, but the only way that works on any PHP version. The
     * idea is from Justin Greer's manual comments for imageCreateTruecolor
     * at php.net. This really doesn't get the correct GD version if it is
     * an external library, since they are defined in the PHP code and
     * just refer to the functionality that is supported. So if one sees
     * "1.6.2 or higher", it can be as high as 1.8.2, depending on the PHP
     * version and which functionality they test for.
     *
     * @return array object GalleryStatus
     *         string the GD version number or '0' if there is no GD support
     *                Prefixed with '>' if PHP says "or higher"
     */
    function discoverGdVersion($gd=null) {
	/*
	 * Caching this result breaks our unit tests, which checks against a variety of
	 * dummy GdFunctionality instances.
	 */
	if (!isset($gd)) {
	    $gd =& GdToolkitHelper::getGdFunctionality();
	}

	if ($gd->functionExists('gd_info')) {
	    list ($ret, $gdInfo) = $gd->gd_info();
	    if ($ret) {
		return array($ret, null);
	    }
	    $matchString = $gdInfo['GD Version'];
	    $matcher = '/([\d\.]+)(\s+or\s+higher)?/i';
	} else {
	    list ($ret, $matchString) = $gd->phpinfo(8);
	    if ($ret) {
		return array($ret, null);
	    }
	    $matcher = '/\bgd\s+version\b[^\d\n\r]+?([\d\.]+)(\s+or\s+higher)?/i';
	}
	if (preg_match($matcher, $matchString, $matches)) {
	    $gdVersion = $matches[1];
	} else {
	    $gdVersion = 0;
	}
	if (isset($matches[2])) {
	    $gdVersion = sprintf('>%s', $gdVersion);
	}

	return array(null, $gdVersion);
    }

    /**
     * See if this GD version is supported by this module.  Currently GD >= 2.0 is supported.
     *
     * @param string $gdVersion A gd version string or empty to check the current version
     * @return array object GalleryStatus
     *	       boolean true if supported, false otherwise
     */
    function isGdVersionSupported($gdVersion=null, $gd=null) {
	if (!isset($gdVersion)) {
	    /* Find out current GD version */
	    if (!isset($gd)) {
		$gd =& GdToolkitHelper::getGdFunctionality();
	    }
	    list ($ret, $gdVersion) = GdToolkitHelper::discoverGdVersion($gd);
	    if ($ret) {
		return array($ret, false);
	    }
	}
	if (preg_match('/^>?2\.0/', $gdVersion)) {
	    return array(null, true);
	}
	/* 1.6, 1.8, ... is too old */
	return array(null, false);
    }

    /**
     * Find out if this GD library is the one bundled with the PHP source.
     * The bundled library provides some functionality that is currently
     * not available on the standard GD library. Those are tested here.
     *
     * @return array object GalleryStatus
     *	       boolean true if it is the bundled library, false otherwise
     */
    function isBundled($gd=null) {
	if (!isset($gd)) {
	    $gd =& GdToolkitHelper::getGdFunctionality();
	}
	if ($gd->functionExists('imageLayerEffect')
	    && $gd->functionExists('imageRotate')) {
	    return array(null, true);
	}
	return array(null, false);
    }

    /**
     * Find out which mime types are supported on this GD.
     *
     * @return array object GalleryStatus
     *	       array supported mime-types
     */
    function discoverMimeTypes($gd=null) {
	if (!isset($gd)) {
	    $gd =& GdToolkitHelper::getGdFunctionality();
	}
	if (!$gd->functionExists('imageTypes')) {
	    return array(null, array());
	}

	$mimeTypes = array();
	if (defined('IMG_GIF') && $gd->imageTypes() & IMG_GIF) {
	    $mimeTypes[] = 'image/gif';
	}
	if (defined('IMG_JPG') && $gd->imageTypes() & IMG_JPG) {
	    $mimeTypes[] = 'image/jpeg';
	}
	if (defined('IMG_PNG') && $gd->imageTypes() & IMG_PNG) {
	    $mimeTypes[] = 'image/png';
	}
	if (defined('IMG_WBMP') && $gd->imageTypes() & IMG_WBMP) {
	    $mimeTypes[] = 'image/vnd.wap.wbmp';
	}
	if ($gd->functionExists('imageXpm')
	    && $gd->functionExists('imageCreateFromXpm')) {
	    $mimeTypes[] = 'image/x-xpixmap';
	}
	if ($gd->functionExists('imageXbm')
	    && $gd->functionExists('imageCreateFromXbm')) {
	    $mimeTypes[] = 'image/x-xbitmap';
	}

	if (count($mimeTypes) == 0) {
	    return array(GalleryCoreApi::error(ERROR_TOOLKIT_FAILURE), null);
	}
	return array(null, $mimeTypes);
    }

    /**
     * Tries to find out if we can imageCreateTrueColor()
     *
     * This function is always defined, but will fail with a Fatal PHP error
     * on GD < 2.0.1. There are a lot of PHP installations compiled with
     * external GD libraries where phpinfo informs "2.0 or higher", so we
     * can't really know which version we have. Currently we will just consider
     * any "2.0" to be "< 2.0.1", since I have never seen a 2.0 release that
     * doesn't support the imageCreateTrueColor().
     *
     * @return boolean
     */
    function hasImageCreateTrueColor($gd=null) {
	if (!isset($gd)) {
	    $gd =& GdToolkitHelper::getGdFunctionality();
	}
	list ($ret, $gdVersion) = GdToolkitHelper::discoverGdVersion($gd);
	if ($ret) {
	    return array($ret, false);
	}
	if (preg_match('/^>?2\.0/', $gdVersion)) {
	    return array(null, true);
	}
	return array(null, false);
    }

    /**
     * Factory to get a new GdFunctionality object.
     * @return object GdFunctionality
     */
    function &getGdFunctionality() {
	static $gdFunctionality;
	if (!isset($gdFunctionality)) {
	    GalleryCoreApi::requireOnce('modules/gd/classes/GdFunctionality.class');
	    $gdFunctionality =& new GdFunctionality();
	}
	return $gdFunctionality;
    }
}
?>