233 lines
6 KiB
PHP
233 lines
6 KiB
PHP
<?php
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/*
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MINIGAL NANO
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- A PHP/HTML/CSS based image gallery script
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This script and included files are subject to licensing from Creative Commons (http://creativecommons.org/licenses/by-sa/2.5/)
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You may use, edit and redistribute this script, as long as you pay tribute to the original author by NOT removing the linkback to www.minigal.dk ("Powered by MiniGal Nano x.x.x")
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MiniGal Nano is created by Thomas Rybak
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Copyright 2010 by Thomas Rybak
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Support: www.minigal.dk
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Community: www.minigal.dk/forum
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Please enjoy this free script!
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Version 0.3.5 modified by Sebastien SAUVAGE (sebsauvage.net):
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- Added thumbnail cache (reduces server CPU load, server bandwith and speeds up client page display).
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- Thumbnails are now always in JPEG even if the source image is PNG or GIF.
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USAGE EXAMPLE:
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File: createthumb.php
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Example: <img src="createthumb.php?filename=photo.jpg&size=100">
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*/
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error_reporting(0);
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$get_filename = $_GET['filename'];
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$get_size = @$_GET['size'];
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if (empty($get_size)) {
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$get_size = 120;
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}
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if (preg_match("/^\/.*/i", $get_filename)) {
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die("Unauthorized access !");
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}
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if (preg_match("/.jpe?g$/i", $get_filename)) {
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$get_filename_type = "JPG";
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}
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if (preg_match("/.gif$/i", $get_filename)) {
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$get_filename_type = "GIF";
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}
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if (preg_match("/.png$/i", $get_filename)) {
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$get_filename_type = "PNG";
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}
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/**
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* Vertical flip
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* @author http://stackoverflow.com/questions/8232722/how-to-flip-part-of-an-image-horizontal-with-php-gd
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*/
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function flipVertical(&$img) {
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$size_x = imagesx($img);
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$size_y = imagesy($img);
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$temp = imagecreatetruecolor($size_x, $size_y);
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$x = imagecopyresampled($temp, $img, 0, 0, 0, ($size_y - 1), $size_x, $size_y, $size_x, 0 - $size_y);
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if ($x) {
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$img = $temp;
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} else {
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die("Unable to flip image");
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}
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}
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/**
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* Horizontal flip
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* @author http://stackoverflow.com/questions/8232722/how-to-flip-part-of-an-image-horizontal-with-php-gd
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*/
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function flipHorizontal(&$img) {
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$size_x = imagesx($img);
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$size_y = imagesy($img);
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$temp = imagecreatetruecolor($size_x, $size_y);
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$x = imagecopyresampled($temp, $img, 0, 0, ($size_x - 1), 0, $size_x, $size_y, 0 - $size_x, $size_y);
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if ($x) {
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$img = $temp;
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} else {
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die("Unable to flip image");
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}
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}
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/**
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* Sanitizing (this allows for collisions)
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*/
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function sanitize($name) {
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return preg_replace("/[^[:alnum:]_.-]/", "_", $name);
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}
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// Make sure the "thumbs" directory exists.
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if (!is_dir('thumbs') && is_writable('.')) {
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mkdir('thumbs', 0700);
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}
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// Thumbnail file name and path.
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// (We always put thumbnails in jpg for simplification)
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$thumbname = 'thumbs/' . sanitize($get_filename) . '.jpg';
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if (file_exists($thumbname)) // If thumbnail exists, serve it.
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{
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$fd = fopen($thumbname, "r");
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$cacheContent = fread($fd, filesize($thumbname));
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fclose($fd);
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header('Content-type: image/jpeg');
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echo ($cacheContent);
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exit;
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}
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// Display error image if file isn't found
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if (!is_file($get_filename)) {
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header('Content-type: image/jpeg');
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$errorimage = imagecreatefromjpeg('images/questionmark.jpg');
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imagejpeg($errorimage, null, 90);
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imagedestroy($errorimage);
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exit;
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}
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// Display error image if file exists, but can't be opened
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if (!is_readable($get_filename)) {
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header('Content-type: image/jpeg');
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$errorimage = imagecreatefromjpeg('images/cannotopen.jpg');
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imagejpeg($errorimage, null, 90);
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imagedestroy($errorimage);
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exit;
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}
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// otherwise, generate thumbnail, send it and save it to file.
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$target = "";
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$xoord = 0;
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$yoord = 0;
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$imgsize = getimagesize($get_filename);
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$width = $imgsize[0];
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$height = $imgsize[1];
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// If the width is greater than the height it’s a horizontal picture
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if ($width > $height) {
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$xoord = ceil(($width - $height) / 2);
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// Then we read a square frame that equals the width
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$width = $height;
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} else {
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$yoord = ceil(($height - $width) / 2);
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$height = $width;
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}
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// Rotate JPG pictures
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// for more info on orientation see
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// http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto/
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$degrees = 0;
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$flip = '';
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if (preg_match("/.jpg$|.jpeg$/i", $_GET['filename'])) {
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if (function_exists('exif_read_data') && function_exists('imagerotate')) {
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$exif = exif_read_data($_GET['filename'], 0, true);
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$ort = $exif['IFD0']['Orientation'];
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switch ($ort) {
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case 3: // 180 rotate right
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$degrees = 180;
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break;
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case 6: // 90 rotate right
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$degrees = 270;
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break;
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case 8: // 90 rotate left
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$degrees = 90;
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break;
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case 2: // flip vertical
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$flip = 'vertical';
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break;
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case 7: // flipped
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$degrees = 90;
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$flip = 'vertical';
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break;
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case 5: // flipped
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$degrees = 270;
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$flip = 'vertical';
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break;
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case 4: // flipped
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$degrees = 180;
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$flip = 'vertical';
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break;
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}
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}
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}
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$target = imagecreatetruecolor($get_size, $get_size);
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// if the picture can be transparent, add a white background
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if (in_array($get_filename_type, array("GIF", "PNG"))) {
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$backgroundColor = imagecolorallocate($target, 255, 255, 255);
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imagefill($target, 0, 0, $backgroundColor);
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}
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if ($get_filename_type == "JPG") {
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$source = imagecreatefromjpeg($get_filename);
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}
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if ($get_filename_type == "GIF") {
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$source = imagecreatefromgif($get_filename);
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}
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if ($get_filename_type == "PNG") {
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$source = imagecreatefrompng($get_filename);
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}
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imagecopyresampled($target, $source, 0, 0, $xoord, $yoord, $get_size, $get_size, $width, $height);
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imagedestroy($source);
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//proper rotation by jan niggemann
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if ($degrees != 0) {
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$target = imagerotate($target, $degrees, 0);
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}
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//proper mirror (aka flip) by jan niggemann
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if ($flip == 'vertical') {
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//only in php >= 5.5.0 ImageJPEG(imageflip($target, IMG_FLIP_VERTICAL),null,80);
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flipVertical($target);
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flipHorizontal($target);
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flipVertical($target);
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}
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ob_start(); // Start output buffering.
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header('Content-type: image/jpeg'); // We always render the thumbnail in JPEG even if the source is GIF or PNG.
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imagejpeg($target, null, 80);
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imagedestroy($target);
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$cachedImage = ob_get_contents(); // Get the buffer content.
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ob_end_flush(); // End buffering
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if (is_writable(dirname($thumbname))) {
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$fd = fopen($thumbname, "w"); // Save buffer to disk
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if ($fd) {
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fwrite($fd, $cachedImage);
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fclose($fd);
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}
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}
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