<?php
/**
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Andreas Gohr <gohr@cosmocode.de>
 */

if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__).'/../../../').'/');
define('DOKU_DISABLE_GZIP_OUTPUT', 1);
require_once(DOKU_INC.'inc/init.php');
require_once(DOKU_INC.'inc/common.php');
require_once(DOKU_INC.'inc/pageutils.php');
require_once(DOKU_INC.'inc/httputils.php');
require_once(DOKU_INC.'inc/pluginutils.php');
require_once(DOKU_INC.'inc/auth.php');
session_write_close();

    // load plugin
    $pl =& plugin_load('syntax','panoview');

    $data = array();
    // get parameters
    list($data['zoom'],$data['col'],$data['row']) = explode('-',$_GET['tile']);
    $data['id']    = cleanID($_GET['image']);
    $data['file']  = mediaFN($data['id']);
    $data['mtime'] = @filemtime($data['file']);

    // check auth and existance
    if(auth_quickaclcheck(getNS($data['id']).':X') < AUTH_READ) gfx_error('noauth');
    if(!$data['mtime']) $pl->gfx_error('notfound');

    // calculate zoom level scaling
    $data['ts']    = 256;
    list($data['width'],$data['height']) = getimagesize($data['file']);
    $data['scale'] = (int)pow(2,$data['zoom']);
    $data['max']   = max($data['width'],$data['height']);
    $data['inv']   = $data['max']  / ($data['ts'] * $data['scale']);


    if($data['inv'] < 0.5) $pl->gfx_error('maxzoom');
    if($data['inv'] < 1.0) $data['inv'] = 1.0; // original size, no upscaling

    // calculate tile boundaries
    $data['tlx']   = (int) ($data['col'] * $data['ts'] * $data['inv']);
    $data['tly']   = (int) ($data['row'] * $data['ts'] * $data['inv']);
    $data['brx']   = (int) ($data['tlx'] + ($data['ts'] * $data['inv']));
    $data['bry']   = (int) ($data['tly'] + ($data['ts'] * $data['inv']));
    if($data['tlx'] > $data['width'] || $data['tly'] > $data['height']) $pl->gfx_error('blank');

    // cache times
    $data['cache']  = getCacheName($data['file'],'.pv.'.$data['zoom'].'-'.$data['col'].'-'.$data['row'].'.jpg');
    $data['cachet'] = @filemtime($data['cache']);

    // (re)generate
    if($data['cachet'] < $data['mtime']){
        $pl->tile_lock($data);
        if($conf['im_convert']){
            $pl->tile_im($data);
        }else{
            $pl->tile_gd($data);
        }
        $pl->tile_unlock($data);
    }

    // send
    header('Content-type: image/jpeg');
    http_conditionalRequest(max($data['mtime'],$data['selft']));
    http_sendfile($data['cache']);
    readfile($data['cache']);


//Setup VIM: ex: et ts=4 enc=utf-8 :