xref: /plugin/panoview/tiles.php (revision 27bbde004b4e000a9433308c2ec2bd5417ea0989) 
1<?php
2/**
3 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
4 * @author     Andreas Gohr <gohr@cosmocode.de>
5 */
6
7if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__).'/../../../').'/');
8define('DOKU_DISABLE_GZIP_OUTPUT', 1);
9require_once(DOKU_INC.'inc/init.php');
10require_once(DOKU_INC.'inc/common.php');
11require_once(DOKU_INC.'inc/pageutils.php');
12require_once(DOKU_INC.'inc/httputils.php');
13require_once(DOKU_INC.'inc/auth.php');
14session_write_close();
15
16    $data = array();
17    // get parameters
18    list($data['zoom'],$data['col'],$data['row']) = explode('-',$_GET['tile']);
19    $data['id']    = cleanID($_GET['image']);
20    $data['file']  = mediaFN($data['id']);
21    $data['mtime'] = @filemtime($data['file']);
22
23    // check auth and existance
24    if(auth_quickaclcheck(getNS($data['id']).':X') < AUTH_READ) gfx_error('noauth');
25    if(!$data['mtime']) gfx_error('notfound');
26
27    // calculate zoom level scaling
28    $data['ts']    = 256;
29    list($data['width'],$data['height']) = getimagesize($data['file']);
30    $data['scale'] = (int)pow(2,$data['zoom']);
31    $data['max']   = max($data['width'],$data['height']);
32    $data['inv']   = $data['max']  / ($data['ts'] * $data['scale']);
33    if($data['inv'] < 1.0) gfx_error('maxzoom');
34
35    // calculate tile boundaries
36    $data['tlx']   = (int) ($data['col'] * $data['ts'] * $data['inv']);
37    $data['tly']   = (int) ($data['row'] * $data['ts'] * $data['inv']);
38    $data['brx']   = (int) ($data['tlx'] + ($data['ts'] * $data['inv']));
39    $data['bry']   = (int) ($data['tly'] + ($data['ts'] * $data['inv']));
40
41    // cache times
42    $data['cache']  = getCacheName($data['file'],'.pv.'.$data['zoom'].'-'.$data['col'].'-'.$data['row'].'.jpg');
43    $data['cachet'] = @filemtime($data['cache']);
44    $data['selft']  = filemtime(__FILE__);
45
46    // (re)generate
47    if( ($data['cachet'] < $data['mtime']) || ($data['cachet'] < $data['selft']) ){
48        tile_gd($data);
49    }
50
51    // send
52    header('Content-type: image/jpeg');
53    http_conditionalRequest(max($data['mtime'],$data['selft']));
54    http_sendfile($data['cache']);
55    readfile($data['cache']);
56
57
58
59
60/* --------------- functions -------------------- */
61
62
63function tile_gd($d){
64    $img = null;
65    if(preg_match('/\.jpe?g$/',$d['file'])){
66        $img   = @imagecreatefromjpeg($d['file']);
67    }elseif(preg_match('/\.png$/',$d['file'])){
68        $img   = @imagecreatefrompng($d['file']);
69    }elseif(preg_match('/\.gif$/',$d['file'])){
70        $img   = @imagecreatefromgif($d['file']);
71    }
72    if(!$img) gfx_error('generic');
73
74    $crop  = image_crop($img,$d['width'],$d['height'],$d['tlx'],$d['tly'],$d['brx'],$d['bry']);
75    imagedestroy($img);
76
77    $scale = image_scale($crop,abs($d['brx'] - $d['tlx']),abs($d['bry'] - $d['tly']),$d['ts'],$d['ts']);
78    imagedestroy($crop);
79
80    imagejpeg($scale,$d['cache']);
81    imagedestroy($scale);
82}
83
84function image_scale($image,$x,$y,$w,$h){
85    $scale=imagecreatetruecolor($w,$h);
86    imagecopyresampled($scale,$image,0,0,0,0,$w,$h,$x,$y);
87    return $scale;
88}
89
90function image_crop($image,$x,$y,$left,$upper,$right,$lower) {
91    $w=abs($right-$left);
92    $h=abs($lower-$upper);
93    $crop = imagecreatetruecolor($w,$h);
94    imagecopy($crop,$image,0,0,$left,$upper,$w,$h);
95    return $crop;
96}
97
98function gfx_error($type){
99    $file = dirname(__FILE__).'/gfx/'.$type.'.gif';
100    $time = filemtime($file);
101    header('Content-type: image/gif');
102
103    http_conditionalRequest($time);
104    http_sendfile($file);
105    readfile($file);
106    exit;
107}
108
109//Setup VIM: ex: et ts=4 enc=utf-8 :
110