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Nathan Adams
260
pluf/src/Pluf/Image/Thumbnail.php
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260
pluf/src/Pluf/Image/Thumbnail.php
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<?php
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/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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# ***** BEGIN LICENSE BLOCK *****
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# This file is part of Plume Framework, a simple PHP Application Framework.
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# Copyright (C) 2001-2007 Loic d'Anterroches and contributors.
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#
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# Plume Framework is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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#
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# Plume Framework is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#
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# ***** END LICENSE BLOCK ***** */
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/**
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* Generate the thumbnail of an image.
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*
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* Sample usage.
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*
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* $thumbnail = new Pluf_Image_Thumbnail($thumbnail_folder, $source_image);
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* if (!$thumbnail->exists()) {
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* $thumbnail_filename = $thumbnail->generate();
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* }
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*
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*/
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class Pluf_Image_Thumbnail
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{
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protected $dir = ''; /**< Path to the thumbnail folder. */
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protected $filename = ''; /**< Filename of the last created thumbnail. */
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public $source = ''; /**< Full path to the source file. */
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public $size = array(120, 120); /** Max width and heigth of the thumb. */
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/**
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* Init the thumbnail class.
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*/
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public function __construct($dir, $source='')
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{
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$this->dir = $dir;
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$this->source = $source;
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}
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/**
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* Get the name of a thumbnail from the image name, the image
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* name can include a path this is just a md5() operation.
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* If the height and the width are given, the info is used to
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* generate the name, else not.
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*
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* @param array Optional size.
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* @return string Filename of the thumbnail.
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*/
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public function getName($size=null)
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{
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$name = md5($this->source);
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if ($size === null) {
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$size = $this->size;
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}
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return $name.'-'.$size[0].'-'.$size[1].'.png';
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}
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/**
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* Get the full path to the thumbnail.
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*/
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function getPath()
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{
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return $this->dir.'/'.$this->getName();
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}
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/**
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* Check if the thumbnail exists.
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*/
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function exists()
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{
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return file_exists($this->getPath());
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}
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/**
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* Get the size of the last created thumbnail
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* return the same results as the builtin getimagesize PHP function.
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*/
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function getSize()
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{
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if (file_exists($this->getPath())) {
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return getimagesize($this->getPath());
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} else {
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return false;
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}
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}
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/**
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* Create thumbnail of an image, proportions are kept.
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*
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* @return mixed Filename or false.
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*/
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function generate()
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{
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if (!file_exists($this->source)) {
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return false;
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}
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if (($size = @getimagesize($this->source)) === false) {
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return false;
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}
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list($w, $h) = $this->size;
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$type = $size[2];
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$H = $size[1];
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$W = $size[0];
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if ($type == '1') {
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$function = 'imagecreatefromgif';
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} elseif ($type == '2') {
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$function = 'imagecreatefromjpeg';
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} elseif ($type == '3') {
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$function = 'imagecreatefrompng';
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} else {
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return false;
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}
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if (!function_exists($function)) {
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return false;
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}
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if (($img = @$function($this->source)) == false) {
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return false;
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}
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// get the zoom factors and the thumbnail height and width
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$rB = $H/$W;
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$rS = $h/$w;
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if (($H > $h) && ($W > $w)) {
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if ($rB > $rS) {
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$height = $h;
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$width = $height/$rB;
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} else {
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$width = $w;
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$height = $width*$rB;
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}
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} elseif ($H > $h) {
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$height = $h;
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$width = $height/$rB;
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} elseif ($W > $w) {
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$width = $w;
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$height = $width*$rB;
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} else {
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$height = $H;
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$width = $W;
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}
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$zx = $W/$width;
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$zy = $H/$height;
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if (Pluf_Image_Thumbnail::gd_version() >= 2) {
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if (($img2=imagecreatetruecolor(round($width),round($height)))===false) {
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return false;
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}
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} else {
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if (($img2=ImageCreate(round($width),round($height)))===false) {
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return false;
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}
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}
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$this->resampleBicubic($img2,$img,0,0,0,0,$width,$height,$zx,$zy);
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if (@imagepng($img2,$this->getPath(),9) === false) {
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return false;
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}
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imagedestroy($img2);
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if (@file_exists($this->getPath())) {
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return $this->getPath();
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} else {
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return false;
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}
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}
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/**
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* Get the current GD version. Need the output buffering functions.
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*/
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public static function gd_version()
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{
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static $gd_version_number = null;
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if ($gd_version_number === null) {
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// Use output buffering to get results from phpinfo()
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// without disturbing the page we're in. Output
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// buffering is "stackable" so we don't even have to
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// worry about previous or encompassing buffering.
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ob_start();
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phpinfo(8);
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$module_info = ob_get_contents();
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ob_end_clean();
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if (preg_match("/\bgd\s+version\b[^\d\n\r]+?([\d\.]+)/i",
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$module_info,$matches)) {
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$gd_version_number = $matches[1];
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} else {
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$gd_version_number = '0';
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}
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}
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return $gd_version_number;
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}
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/* ========================================================================
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* Private functions, should not be called from outside of the class.
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* ========================================================================
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*/
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/**
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* Resample the image
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* http://www.php.net/manual/en/function.imagecopyresized.php
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*/
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protected function resampleBicubic(&$dst, &$src, $dstx, $dsty, $srcx,
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$srcy, $w, $h, $zoomX, $zoomY='')
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{
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if (!$zoomY) {
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$zoomY = $zoomX;
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}
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$palsize = ImageColorsTotal($src);
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for ($i = 0; $i<$palsize; $i++) {
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$colors = ImageColorsForIndex($src, $i);
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ImageColorAllocate($dst, $colors['red'], $colors['green'],
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$colors['blue']);
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}
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$zoomX2 = (int)($zoomX/2);
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$zoomY2 = (int)($zoomY/2);
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$dstX = imagesx($dst);
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$dstY = imagesy($dst);
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$srcX = imagesx($src);
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$srcY = imagesy($src);
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for ($j=0; $j<($h-$dsty); $j++) {
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$sY = (int)($j*$zoomY) + $srcy;
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$y13 = $sY+$zoomY2;
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$dY = $j+$dsty;
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if (($sY >= $srcY) or ($dY >= $dstY) or ($y13 >= $srcY)) {
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break 1;
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}
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for ($i=0; $i<($w-$dstx); $i++) {
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$sX = (int)($i*$zoomX)+$srcx;
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$x34 = $sX+$zoomX2;
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$dX = $i+$dstx;
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if (($sX >= $srcX) or ($dX >= $dstX) or ($x34 >= $srcX)) {
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break 1;
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}
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$c1 = ImageColorsForIndex($src, ImageColorAt($src, $sX, $y13));
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$c2 = ImageColorsForIndex($src, ImageColorAt($src, $sX, $sY));
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$c3 = ImageColorsForIndex($src, ImageColorAt($src, $x34, $y13));
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$c4 = ImageColorsForIndex($src, ImageColorAt($src, $x34, $sY));
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$r = ($c1['red']+$c2['red']+$c3['red']+$c4['red'])/4;
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$g = ($c1['green']+$c2['green']+$c3['green']+$c4['green'])/4;
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$b = ($c1['blue']+$c2['blue']+$c3['blue']+$c4['blue'])/4;
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ImageSetPixel($dst, $dX, $dY, ImageColorClosest($dst, $r,
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$g, $b));
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}
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}
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}
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}
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