note 110130 deleted from function.imagecopymerge by googleguy
| From: | googleguy@php.net | Date: | Sat, 22 Sep 2012 23:47:35 +0000 |
| Subject: | note 110130 deleted from function.imagecopymerge by googleguy | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-190965@lists.php.net to get a copy of this message | ||
Note Submitter: mikech at livinginthepast-audioweb dot co dot uk
----
(Part #2, watermarking 'X' number of images, by php replacing jpg files [see also part
#1])
/images/overlay.php ~
<?php
/**
* This module does the watermarking for images. The image file (PHP with image file type extension)
* must define '$uri' then include this as a require_once. To make the image executable as
PHP its
* file name must be explicitly declared in .htaccess to be handled as PHP.
*/
Header('Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0');
Header('Expires: Sun, 1 Jan 2012 00:00:01 GMT');
Header('Pragma: no-cache');
if ( ! defined( 'DIR_ROOT' ) ) {
define('DIR_ROOT', str_replace( "\\", "/", dirname( __FILE__ ) ) .
'/' );
}
// ^ Includes images subpath as well if in images folder.
if ( ! defined( 'FILE_LOCATION' ) ) {
define('FILE_LOCATION', DIR_ROOT . 'source/');
}
if ( ! defined( 'WATERMARK_FILE_LOCATION' ) ) {
define('WATERMARK_FILE_LOCATION', DIR_ROOT . 'watermark.png');
}
// Isolate file name only if images subpath included:
$pos = strripos($uri, '/');
if ($pos !== false) $uri = substr($uri, $pos+1);
$test = is_file(FILE_LOCATION . $uri);
if ($test===false) throw new Exception('File not found: ' . $uri);
$sourcefile = FILE_LOCATION . $uri;
// Get extension/image type:
$fileType = strtolower(substr($sourcefile, -3));
switch($fileType) {
case('gif'):
$sourcefile_id = imagecreatefromgif($sourcefile);
break;
case('png'):
$sourcefile_id = imagecreatefrompng($sourcefile);
break;
case('jpg'):
$sourcefile_id = imagecreatefromjpeg($sourcefile);
break;
default:
throw new Exception('Invalid file type (not gif/png/jpg): ' . $uri);
}
$insert = imagecreatefrompng(WATERMARK_FILE_LOCATION);
$insertWidth = imagesx($insert);
$insertHeight = imagesy($insert);
$imageWidth = imagesx($sourcefile_id);
$imageHeight = imagesy($sourcefile_id);
$overlapX = $imageWidth - $insertWidth - 5;
$overlapY = $imageHeight - $insertHeight - 5;
/**
If source is GIF can't blend into, so just merge watermark insert with a set transparent
background
(This was the original code I started with).
*/
if ($fileType == 'gif') {
imagecolortransparent($insert, imagecolorat($insert, 0, 0));
imagecopymerge($sourcefile_id, $insert, $overlapX, $overlapY, 0, 0, $insertWidth, $insertHeight,
90);
} else {
ImageAlphaBlending($sourcefile_id, true);
imageCopy($sourcefile_id, $insert, $overlapX, $overlapY, 0, 0, $insertWidth, $insertHeight);
}
switch($fileType) {
case('gif'):
Header( "Content-type: image/gif");
ImageGIF($sourcefile_id);
break;
case('png'):
Header( "Content-type: image/png");
ImagePNG($sourcefile_id);
break;
default:
Header( "Content-type: image/jpeg");
ImageJPEG($sourcefile_id);
}
// destroy the memory
ImageDestroy($sourcefile_id);
ImageDestroy($insert);
?>
This means the page HTML doesn't have to change, it fetches what it thinks are image files
exactly as before, but now they come with watermarks.