197 lines
28 KiB
PHP
197 lines
28 KiB
PHP
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<?php
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/*
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* class.Thumbnail.php
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*
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* Copyright (C) 2001 - 2006 Hidayet Dogan
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*
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* http://www.hido.net/projects/phpThumbnailer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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class Thumbnail {
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var $errmsg = "";
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var $error = false;
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var $format = "";
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var $file = "";
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var $max_width = 0;
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var $max_height = 0;
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var $percent = 0;
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var $jpeg_quality = 75;
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function Thumbnail($file, $max_width = 0, $max_height = 0, $percent = 0, $jpeg_quality = 75) {
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if (!file_exists($file)) {
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$this->errmsg = "File doesn't exists";
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$this->error = true;
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}else if (!is_readable($file)) {
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$this->errmsg = "File is not readable";
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$this->error = true;
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}
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if (strstr(strtolower($file), ".gif")) {$this->format = "GIF";}
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else if (strstr(strtolower($file), ".jpg") ||
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strstr(strtolower($file), ".jpeg")) {
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$this->format = "JPEG";
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}
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else if (strstr(strtolower($file), ".png")) {
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$this->format = "PNG";
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}
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else {
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$this->errmsg = "Unknown file format";
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$this->error = true;
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}
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if ($max_width == 0 && $max_height == 0 && $percent == 0) {
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$percent = 100;
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}
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$this->max_width = $max_width;
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$this->max_height = $max_height;
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$this->percent = $percent;
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$this->file = $file;
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$this->jpeg_quality = $jpeg_quality;
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}
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function calc_width($width, $height) {
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$new_width = $this->max_width;
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$new_wp = (100 * $new_width) / $width;
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$new_height = ($height * $new_wp) / 100;
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return array($new_width, $new_height);
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}
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function calc_height($width, $height) {
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$new_height = $this->max_height;
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$new_hp = (100 * $new_height) / $height;
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$new_width = ($width * $new_hp) / 100;
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return array($new_width, $new_height);
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}
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function calc_percent($width, $height) {
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$new_width = ($width * $this->percent) / 100;
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$new_height = ($height * $this->percent) / 100;
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return array($new_width, $new_height);
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}
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function return_value($array) {
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$array[0] = intval($array[0]);
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$array[1] = intval($array[1]);
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return $array;
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}
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function calc_image_size($width, $height) {
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$new_size = array($width, $height);
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if ($this->max_width > 0 && $width > $this->max_width) {
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$new_size = $this->calc_width($width, $height);
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if ($this->max_height > 0 && $new_size[1] > $this->max_height) {
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$new_size = $this->calc_height($new_size[0], $new_size[1]);
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}
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return $this->return_value($new_size);
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}
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if ($this->max_height > 0 && $height > $this->max_height) {
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$new_size = $this->calc_height($width, $height);
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return $this->return_value($new_size);
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}
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if ($this->percent > 0) {
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$new_size = $this->calc_percent($width, $height);
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return $this->return_value($new_size);
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}
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return $this->return_value($new_size);
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}
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function show_error_image() {
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header("Content-type: image/png");
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$err_img = ImageCreate(220, 25);
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$bg_color = ImageColorAllocate($err_img, 0, 0, 0);
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$fg_color1 = ImageColorAllocate($err_img, 255, 255, 255);
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$fg_color2 = ImageColorAllocate($err_img, 255, 0, 0);
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ImageString($err_img, 3, 6, 6, "ERROR:", $fg_color2);
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ImageString($err_img, 3, 55, 6, $this->errmsg, $fg_color1);
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ImagePng($err_img);
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ImageDestroy($err_img);
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}
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function show($name = "") {
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if ($this->error) {
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$this->show_error_image();
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return;
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}
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$size = GetImageSize($this->file);
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$new_size = $this->calc_image_size($size[0], $size[1]);
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#
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# Good idea from Mariano Cano Pérez
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# Requires GD 2.0.1 (PHP >= 4.0.6)
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#
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if (function_exists("ImageCreateTrueColor")) {
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$new_image = ImageCreateTrueColor($new_size[0], $new_size[1]);
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}
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else {
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$new_image = ImageCreate($new_size[0], $new_size[1]);
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}
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switch ($this->format) {
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case "GIF":
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$old_image = ImageCreateFromGif($this->file);
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$alpha = imagecolortransparent($old_image);
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if($alpha >= 0){
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$trnprt_color = imagecolorsforindex($old_image, $alpha);
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$trnprt_indx = imagecolorallocate($new_image, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
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imagefill($new_image, 0, 0, $trnprt_indx);
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imagecolortransparent($new_image, $trnprt_indx);
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}
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break;
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case "JPEG":
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$old_image = ImageCreateFromJpeg($this->file);
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break;
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case "PNG":
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$old_image = ImageCreateFromPng($this->file);
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imagealphablending($new_image, false);
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imagesavealpha($new_image, true);
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break;
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}
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#
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# Good idea from Michael Wald
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# Requires GD 2.0.1 (PHP >= 4.0.6)
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#
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if (function_exists("ImageCopyResampled")) {
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ImageCopyResampled($new_image, $old_image, 0, 0, 0, 0, $new_size[0], $new_size[1], $size[0], $size[1]);
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}
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else {
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ImageCopyResized($new_image, $old_image, 0, 0, 0, 0, $new_size[0], $new_size[1], $size[0], $size[1]);
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}
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switch ($this->format) {
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case "GIF":
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if (!empty($name)) {
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ImageGif($new_image, $name);
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}
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else {
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header("Content-type: image/gif");
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ImageGif($new_image);
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}
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break;
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case "JPEG":
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if (!empty($name)) {
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ImageJpeg($new_image, $name, $this->jpeg_quality);
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}
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else {
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header("Content-type: image/jpeg");
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ImageJpeg($new_image, "", $this->jpeg_quality);
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}
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break;
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case "PNG":
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if (!empty($name)) {
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ImagePng($new_image, $name);
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}
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else {
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header("Content-type: image/png");
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ImagePng($new_image);
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}
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break;
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}
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ImageDestroy($new_image);
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ImageDestroy($old_image);
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return;
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}
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function save($name) {
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$this->show($name);
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}
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}
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