simplify $_GET usage (move to beginning for easy escape if need be).
simplify orientation reading from big case to two small arrays.
This commit is contained in:
Piotr KUCHARSKI
parent
92f0e5bba0
commit
8ab86967f7
259
createthumb.php
259
createthumb.php
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@ -20,16 +20,19 @@ Version 0.3.5 modified by Sebastien SAUVAGE (sebsauvage.net):
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USAGE EXAMPLE:
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File: createthumb.php
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Example: <img src="createthumb.php?filename=photo.jpg&width=100&height=100">
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*/
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// error_reporting(E_ALL);
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error_reporting(0);
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/*
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if (preg_match("/.jpg$|.jpeg$/i", $_GET['filename'])) header('Content-type: image/jpeg');
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if (preg_match("/.gif$/i", $_GET['filename'])) header('Content-type: image/gif');
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if (preg_match("/.png$/i", $_GET['filename'])) header('Content-type: image/png');
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Example: <img src="createthumb.php?filename=photo.jpg&size=100">
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*/
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error_reporting(0);
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$get_filename = $_GET['filename'];
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$get_size = @$_GET['size'];
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if (empty($get_size)) $get_size = 120;
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if (preg_match("/.jpe?g$/i", $get_filename)) $get_filename_type = "JPG";
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if (preg_match("/.gif$/i", $get_filename)) $get_filename_type = "GIF";
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if (preg_match("/.png$/i", $get_filename)) $get_filename_type = "PNG";
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// flip functions from http://stackoverflow.com/questions/8232722/how-to-flip-part-of-an-image-horizontal-with-php-gd
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function flipVertical(&$img) {
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$size_x = imagesx($img);
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@ -90,150 +93,124 @@ if (!is_dir('thumbs') && is_writable('.'))
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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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$thumbname = 'thumbs/'.sanitize($get_filename).'.jpg';
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if (file_exists($thumbname))// If thumbnail exists, serve it.
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if (file_exists($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 ($thumbname));
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$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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else // otherwise, generate thumbnail, send it and save it to file.
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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 = $imgsize[1];
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if ($width > $height) // If the width is greater than the height it’s a horizontal picture
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{
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$xoord = ceil(($width-$height)/2);
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$width = $height; // Then we read a square frame that equals the width
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}
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else
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{
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$yoord = ceil(($height-$width)/2);
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$height = $width;
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}
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// Display error image if file isn't found
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if (!is_file($_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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}
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// Display error image if file exists, but can't be opened
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if (substr(decoct(fileperms($_GET['filename'])), -1, strlen(fileperms($_GET['filename']))) < 4 OR substr(decoct(fileperms($_GET['filename'])), -3,1) < 4) {
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header('Content-type: image/jpeg');
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$errorimage = ImageCreateFromJPEG('images/cannotopen.jpg');
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ImageJPEG($errorimage,null,90);
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}
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// Define variables
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$target = "";
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$xoord = 0;
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$yoord = 0;
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if ($_GET['size'] == "")
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// Rotate JPG pictures
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$degrees = 0;
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$flip = '';
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if ($get_filename_type == "JPG")
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{
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if (function_exists('exif_read_data') && function_exists('imagerotate'))
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{
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$_GET['size'] = 120;
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}
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$imgsize = GetImageSize($_GET['filename']);
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$width = $imgsize[0];
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$height = $imgsize[1];
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if ($width > $height) // If the width is greater than the height it’s a horizontal picture
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{
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$xoord = ceil(($width-$height)/2);
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$width = $height; // Then we read a square frame that equals the width
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}
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else
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{
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$yoord = ceil(($height-$width)/2);
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$height = $width;
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}
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$degrees = 0;
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$flip = '';
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// Rotate JPG pictures
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if (preg_match("/.jpg$|.jpeg$/i", $_GET['filename']))
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{
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if (function_exists('exif_read_data') && function_exists('imagerotate'))
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{
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$exif = exif_read_data($_GET['filename'], 0, true);
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if (isset($exif['IFD0']) && isset($exif['IFD0']['Orientation']))
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$ort = $exif['IFD0']['Orientation'];
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else
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$ort = 0;
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switch($ort)
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{
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case 3: // 180 rotate right
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$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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$flip = 'vertical';
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break;
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// see http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto/ for more info on orientation
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case 7: // flipped
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$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 instead a black
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if (preg_match("/.gif$/i", $_GET['filename']) || preg_match("/.png$/i", $_GET['filename']))
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{
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$backgroundColor = imagecolorallocate($target, 255, 255, 255);
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imagefill($target, 0, 0, $backgroundColor);
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}
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if (preg_match("/.jpg$/i", $_GET['filename'])) $source = ImageCreateFromJPEG($_GET['filename']);
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if (preg_match("/.gif$/i", $_GET['filename'])) $source = ImageCreateFromGIF($_GET['filename']);
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if (preg_match("/.png$/i", $_GET['filename'])) $source = ImageCreateFromPNG($_GET['filename']);
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imagecopyresampled($target,$source,0,0,$xoord,$yoord,$_GET['size'],$_GET['size'],$width,$height);
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imagedestroy($source);
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//if (preg_match("/.jpg$/i", $_GET['filename'])) ImageJPEG($target,null,90);
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//if (preg_match("/.gif$/i", $_GET['filename'])) ImageGIF($target,null,90);
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//if (preg_match("/.png$/i", $_GET['filename'])) ImageJPEG($target,null,90); // Using ImageJPEG on purpose
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//proper rotation by jan niggemann
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if ($degrees != 0)
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{
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$target = imagerotate($target, $degrees, 0);
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}
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ob_start(); // Start output buffering.
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header('Content-type: image/jpeg'); // We always render the thumbnail in JPEG even if the source is GIF or PNG.
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//proper mirror (aka flip) by jan niggemann
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if ($flip == 'vertical')
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{
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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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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 ($fd)
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{
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fwrite($fd,$cachedImage);
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fclose($fd);
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}
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$exif = exif_read_data($get_filename, 0, true);
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if (isset($exif['IFD0']) && isset($exif['IFD0']['Orientation']))
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$ort = $exif['IFD0']['Orientation'];
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else
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$ort = 0;
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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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$ort2deg = array(3=>180, 4=>180, 5=>270, 6=>270, 7=>90, 8=>90);
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$degrees = in_array($ort, $ort2deg) ? $ort2deg[$ort] : 0;
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$ort2flip = array(2, 4, 5, 7);
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$flip = in_array($ort, $flip2deg) ? 'vertical' : '';
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}
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}
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$target = imagecreatetruecolor($get_size, $get_size);
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// if the picture can be transparent, add a white background instead a black
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if (in_array($get_filename_type, array("GIF", "PNG")))
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{
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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") $source = imagecreatefromjpeg($get_filename);
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if ($get_filename_type == "GIF") $source = imagecreatefromgif($get_filename);
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if ($get_filename_type == "PNG") $source = imagecreatefrompng($get_filename);
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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 ($degrees != 0)
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{
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$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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{
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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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{
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$fd = fopen($thumbname, "w"); // Save buffer to disk
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if ($fd)
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{
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fwrite($fd,$cachedImage);
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fclose($fd);
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}
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}
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?>
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