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[autoinstallsdev/mediawiki.git] / includes / ImageFunctions.php
1 <?php
2 /**
3  * Global functions related to images
4  *
5  * @file
6  */
7
8 /**
9  * Determine if an image exists on the 'bad image list'.
10  *
11  * The format of MediaWiki:Bad_image_list is as follows:
12  *    * Only list items (lines starting with "*") are considered
13  *    * The first link on a line must be a link to a bad image
14  *    * Any subsequent links on the same line are considered to be exceptions,
15  *      i.e. articles where the image may occur inline.
16  *
17  * @param $name string the image name to check
18  * @param $contextTitle Title: the page on which the image occurs, if known
19  * @return bool
20  */
21 function wfIsBadImage( $name, $contextTitle = false ) {
22         static $badImages = false;
23         wfProfileIn( __METHOD__ );
24
25         # Handle redirects
26         $redirectTitle = RepoGroup::singleton()->checkRedirect( Title::makeTitle( NS_FILE, $name ) );
27         if( $redirectTitle ) {
28                 $name = $redirectTitle->getDbKey();
29         }
30
31         # Run the extension hook
32         $bad = false;
33         if( !wfRunHooks( 'BadImage', array( $name, &$bad ) ) ) {
34                 wfProfileOut( __METHOD__ );
35                 return $bad;
36         }
37
38         if( !$badImages ) {
39                 # Build the list now
40                 $badImages = array();
41                 $lines = explode( "\n", wfMsgForContentNoTrans( 'bad_image_list' ) );
42                 foreach( $lines as $line ) {
43                         # List items only
44                         if ( substr( $line, 0, 1 ) !== '*' ) {
45                                 continue;
46                         }
47
48                         # Find all links
49                         $m = array();
50                         if ( !preg_match_all( '/\[\[:?(.*?)\]\]/', $line, $m ) ) {
51                                 continue;
52                         }
53
54                         $exceptions = array();
55                         $imageDBkey = false;
56                         foreach ( $m[1] as $i => $titleText ) {
57                                 $title = Title::newFromText( $titleText );
58                                 if ( !is_null( $title ) ) {
59                                         if ( $i == 0 ) {
60                                                 $imageDBkey = $title->getDBkey();
61                                         } else {
62                                                 $exceptions[$title->getPrefixedDBkey()] = true;
63                                         }
64                                 }
65                         }
66
67                         if ( $imageDBkey !== false ) {
68                                 $badImages[$imageDBkey] = $exceptions;
69                         }
70                 }
71         }
72
73         $contextKey = $contextTitle ? $contextTitle->getPrefixedDBkey() : false;
74         $bad = isset( $badImages[$name] ) && !isset( $badImages[$name][$contextKey] );
75         wfProfileOut( __METHOD__ );
76         return $bad;
77 }
78
79 /**
80  * Calculate the largest thumbnail width for a given original file size
81  * such that the thumbnail's height is at most $maxHeight.
82  * @param $boxWidth Integer Width of the thumbnail box.
83  * @param $boxHeight Integer Height of the thumbnail box.
84  * @param $maxHeight Integer Maximum height expected for the thumbnail.
85  * @return Integer.
86  */
87 function wfFitBoxWidth( $boxWidth, $boxHeight, $maxHeight ) {
88         $idealWidth = $boxWidth * $maxHeight / $boxHeight;
89         $roundedUp = ceil( $idealWidth );
90         if( round( $roundedUp * $boxHeight / $boxWidth ) > $maxHeight )
91                 return floor( $idealWidth );
92         else
93                 return $roundedUp;
94 }