Файл: qa-include/qa-image.php
Строк: 98
<?php
/*
Question2Answer (c) Gideon Greenspan
http://www.question2answer.org/
File: qa-include/qa-image.php
Version: See define()s at top of qa-include/qa-base.php
Description: Outputs image for a specific blob at a specific size, caching as appropriate
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
More about this license: http://www.question2answer.org/license.php
*/
// Ensure no PHP errors are shown in the image data
@ini_set('display_errors', 0);
function qa_image_db_fail_handler()
{
header('HTTP/1.1 500 Internal Server Error');
qa_exit('error');
}
// Load the Q2A base file which sets up a bunch of crucial stuff
require 'qa-base.php';
qa_report_process_stage('init_image');
// Retrieve the scaled image from the cache if available
require_once QA_INCLUDE_DIR.'qa-db-cache.php';
qa_db_connect('qa_image_db_fail_handler');
$blobid=qa_get('qa_blobid');
$size=(int)qa_get('qa_size');
$cachetype='i_'.$size;
$content=qa_db_cache_get($cachetype, $blobid); // see if we've cached the scaled down version
header('Cache-Control: max-age=2592000, public'); // allows browsers and proxies to cache images too
if (isset($content)) {
header('Content-Type: image/jpeg');
echo $content;
} else {
require_once QA_INCLUDE_DIR.'qa-app-options.php';
require_once QA_INCLUDE_DIR.'qa-db-blobs.php';
require_once QA_INCLUDE_DIR.'qa-util-image.php';
// Otherwise retrieve the raw image and scale as appropriate
$blob=qa_db_blob_read($blobid);
if (isset($blob)) {
if ($size>0)
$content=qa_image_constrain_data($blob['content'], $width, $height, $size);
else
$content=$blob['content'];
if (isset($content)) {
header('Content-Type: image/jpeg');
echo $content;
if (strlen($content) && ($size>0)) {
$cachesizes=qa_get_options(array('avatar_profile_size', 'avatar_users_size', 'avatar_q_page_q_size', 'avatar_q_page_a_size', 'avatar_q_page_c_size', 'avatar_q_list_size'));
// to prevent cache being filled with inappropriate sizes
if (array_search($size, $cachesizes))
qa_db_cache_set($cachetype, $blobid, $content);
}
}
}
}
qa_db_disconnect();
/*
Omit PHP closing tag to help avoid accidental output
*/