functions_thumbs.php

来自「这是php编的论坛的原代码」· PHP 代码 · 共 234 行

<?php
/***************************************************************************
 *                            functions_thumbs.php
 *                            -------------------
 *   begin                : Sat, Jul 27, 2002
 *   copyright            : (C) 2002 Meik Sievertsen
 *   email                : [e-mail]
 *
 *   $Id: functions_thumbs.php,v 1.1.1.1 2003/02/11 22:27:31 wei.gao Exp $
 *
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   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.
 *
 *
 ***************************************************************************/

//
// All Attachment Functions needed to create Thumbnails
//
if ( !defined('IN_PHPBB') )
{
	die('Hacking attempt');
	exit;
}

$imagick = '';

//
// Calculate the needed size for Thumbnail
//
function get_img_size_format($width, $height)
{

	// Change these two values to define the Thumbnail Size
	$max_width = 300;	
	$max_height = 85;
	
	if ($width > $max_width)
	{
		$tag_height = ($max_width / $width) * $height;
		$tag_width = $max_width;
		
		if ($tag_height > $max_height) 
		{
			$tag_width = ($max_height / $tag_height) * $tag_width;
			$tag_height = $max_height;
		}
	} 
	else if ($height > $max_height) 
	{
		$tag_width = ($max_height / $height) * $width;
		$tag_height = $max_height;

		if ($tag_width > $max_width) 
		{
			$tag_height = ($max_width / $tag_width) * $tag_height;
			$tag_width = $max_width;
		}
	} 
	else 
	{
		$tag_width = $width;
		$tag_height = $height;
	}

	$tag_width = round($tag_width);
	$tag_height = round($tag_height);
        
	return array(
		$tag_width,
		$tag_height
	);
}

//
// Check if imagick is present
//
function is_imagick() 
{
	global $imagick, $attach_config;

	if ($attach_config['img_imagick'] != '')
	{
		$imagick = $attach_config['img_imagick'];
		return (TRUE);
	}
	else
	{
		return (FALSE);
	}
}

function get_supported_image_types()
{
	$types = array();

	if (extension_loaded('gd'))
	{
		if (function_exists('imagegif'))
		{
			$types[] = '1';
		}
		if (function_exists('imagejpeg'))
		{
			$types[] = '2';
		}
		if (function_exists('imagepng'))
		{
			$types[] = '3';
		}
    }

	return ($types);
}

function create_thumbnail($source, $new_file, $mimetype) 
{
	global $attach_config, $imagick;

	$min_filesize = intval($attach_config['img_min_thumb_filesize']);

	$img_filesize = (@file_exists(@amod_realpath($source))) ? filesize($source) : false;

	$destination = trim($destination);

	if (!$img_filesize || $img_filesize <= $min_filesize) 
	{
		return (FALSE);
	}
    
	$size = image_getdimension($source);

	if ( ($size[0] == 0) && ($size[1] == 0) )
	{
		return (FALSE);
	}

	$new_size = get_img_size_format($size[0], $size[1]);

	$tmp_path = '';
	$old_file = '';

	if (intval($attach_config['allow_ftp_upload']))
	{
		$old_file = $new_file;

		$tmp_path = explode('/', $source);
		$tmp_path[count($tmp_path)-1] = '';
		$tmp_path = implode('/', $tmp_path);

		if ($tmp_path == '')
		{
			$tmp_path = '/tmp';
		}

		$value = trim($tmp_path);

		if ($value[strlen($value)-1] == '/')
		{
			$value[strlen($value)-1] = ' ';
		}
			
		$new_file = trim($value) . '/t00000';
	}
	
	if (is_imagick()) 
	{
		if (is_array($size) && count($size) > 0) 
		{
			@exec($imagick . ' -quality 90 -antialias -sample ' . $new_size[0] . 'x' . $new_size[1] . ' ' . $source . ' ' . $new_file);
		}
	} 
	else 
	{
		$type = $size[2];
		$supported_types = get_supported_image_types();
		
		if (in_array($type, $supported_types) )
		{

			switch ($type) 
			{
				case '1' :
					$im = imagecreatefromgif($source);
					$new_im = imagecreate($new_size[0], $new_size[1]);
					imagecopyresized($new_im, $im, 0, 0, 0, 0, $new_size[0], $new_size[1], $size[0], $size[1]);
					imagegif($new_im, $new_file);
					break;
				case '2' :
					$im = imagecreatefromjpeg($source);
					$new_im = imagecreate($new_size[0], $new_size[1]);
					imagecopyresized($new_im, $im, 0, 0, 0, 0, $new_size[0], $new_size[1], $size[0], $size[1]);
					imagejpeg($new_im, $new_file, 90);
					break;
				case '3' :
					$im = imagecreatefrompng($source);
					$new_im = imagecreate($new_size[0], $new_size[1]);
					imagecopyresized($new_im, $im, 0, 0, 0, 0, $new_size[0], $new_size[1], $size[0], $size[1]);
					imagepng($new_im, $new_file);
					break;
			}
		}
	}

	if (!@file_exists(@amod_realpath($new_file)))
	{
		return (FALSE);
	}

	if (intval($attach_config['allow_ftp_upload']))
	{
		$result = ftp_file($new_file, $old_file, $this->type, TRUE); // True for disable error-mode
		if (!$result)
		{
			return (FALSE);
		}
	}
	else
	{
		@chmod($new_file, 0666);
	}
	
	return (TRUE);

}

?>