1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
<?php
/**
* @file
* @ingroup Media
*/
/**
* Stuff specific to JPEG and (built-in) TIFF handler.
* All metadata related, since both JPEG and TIFF support Exif.
*
* @ingroup Media
*/
class ExifBitmapHandler extends BitmapHandler {
const BROKEN_FILE = '-1'; // error extracting metadata
const OLD_BROKEN_FILE = '0'; // outdated error extracting metadata.
function convertMetadataVersion( $metadata, $version = 1 ) {
// basically flattens arrays.
$version = explode(';', $version, 2);
$version = intval($version[0]);
if ( $version < 1 || $version >= 2 ) {
return $metadata;
}
$avoidHtml = true;
if ( !is_array( $metadata ) ) {
$metadata = unserialize( $metadata );
}
if ( !isset( $metadata['MEDIAWIKI_EXIF_VERSION'] ) || $metadata['MEDIAWIKI_EXIF_VERSION'] != 2 ) {
return $metadata;
}
// Treat Software as a special case because in can contain
// an array of (SoftwareName, Version).
if (isset( $metadata['Software'] )
&& is_array( $metadata['Software'] )
&& is_array( $metadata['Software'][0])
&& isset( $metadata['Software'][0][0] )
&& isset( $metadata['Software'][0][1])
) {
$metadata['Software'] = $metadata['Software'][0][0] . ' (Version '
. $metadata['Software'][0][1] . ')';
}
// ContactInfo also has to be dealt with specially
if ( isset( $metadata['Contact'] ) ) {
$metadata['Contact'] =
FormatMetadata::collapseContactInfo(
$metadata['Contact'] );
}
foreach ( $metadata as &$val ) {
if ( is_array( $val ) ) {
$val = FormatMetadata::flattenArray( $val, 'ul', $avoidHtml );
}
}
$metadata['MEDIAWIKI_EXIF_VERSION'] = 1;
return $metadata;
}
function isMetadataValid( $image, $metadata ) {
global $wgShowEXIF;
if ( !$wgShowEXIF ) {
# Metadata disabled and so an empty field is expected
return self::METADATA_GOOD;
}
if ( $metadata === self::OLD_BROKEN_FILE ) {
# Old special value indicating that there is no EXIF data in the file.
# or that there was an error well extracting the metadata.
wfDebug( __METHOD__ . ": back-compat version\n");
return self::METADATA_COMPATIBLE;
}
if ( $metadata === self::BROKEN_FILE ) {
return self::METADATA_GOOD;
}
wfSuppressWarnings();
$exif = unserialize( $metadata );
wfRestoreWarnings();
if ( !isset( $exif['MEDIAWIKI_EXIF_VERSION'] ) ||
$exif['MEDIAWIKI_EXIF_VERSION'] != Exif::version() )
{
if ( isset( $exif['MEDIAWIKI_EXIF_VERSION'] ) &&
$exif['MEDIAWIKI_EXIF_VERSION'] == 1 )
{
//back-compatible but old
wfDebug( __METHOD__.": back-compat version\n" );
return self::METADATA_COMPATIBLE;
}
# Wrong (non-compatible) version
wfDebug( __METHOD__.": wrong version\n" );
return self::METADATA_BAD;
}
return self::METADATA_GOOD;
}
/**
* @param $image File
* @return array|bool
*/
function formatMetadata( $image ) {
$metadata = $image->getMetadata();
if ( $metadata === self::OLD_BROKEN_FILE ||
$metadata === self::BROKEN_FILE ||
$this->isMetadataValid( $image, $metadata ) === self::METADATA_BAD )
{
// So we don't try and display metadata from PagedTiffHandler
// for example when using InstantCommons.
return false;
}
$exif = unserialize( $metadata );
if ( !$exif ) {
return false;
}
unset( $exif['MEDIAWIKI_EXIF_VERSION'] );
if ( count( $exif ) == 0 ) {
return false;
}
return $this->formatMetadataHelper( $exif );
}
function getMetadataType( $image ) {
return 'exif';
}
/**
* Wrapper for base classes ImageHandler::getImageSize() that checks for
* rotation reported from metadata and swaps the sizes to match.
*
* @param File $image
* @param string $path
* @return array
*/
function getImageSize( $image, $path ) {
global $wgEnableAutoRotation;
$gis = parent::getImageSize( $image, $path );
// Don't just call $image->getMetadata(); FSFile::getPropsFromPath() calls us with a bogus object.
// This may mean we read EXIF data twice on initial upload.
if ( $wgEnableAutoRotation ) {
$meta = $this->getMetadata( $image, $path );
$rotation = $this->getRotationForExif( $meta );
} else {
$rotation = 0;
}
if ($rotation == 90 || $rotation == 270) {
$width = $gis[0];
$gis[0] = $gis[1];
$gis[1] = $width;
}
return $gis;
}
/**
* On supporting image formats, try to read out the low-level orientation
* of the file and return the angle that the file needs to be rotated to
* be viewed.
*
* This information is only useful when manipulating the original file;
* the width and height we normally work with is logical, and will match
* any produced output views.
*
* @param $file File
* @return int 0, 90, 180 or 270
*/
public function getRotation( $file ) {
global $wgEnableAutoRotation;
if ( !$wgEnableAutoRotation ) {
return 0;
}
$data = $file->getMetadata();
return $this->getRotationForExif( $data );
}
/**
* Given a chunk of serialized Exif metadata, return the orientation as
* degrees of rotation.
*
* @param string $data
* @return int 0, 90, 180 or 270
* @fixme orientation can include flipping as well; see if this is an issue!
*/
protected function getRotationForExif( $data ) {
if ( !$data ) {
return 0;
}
wfSuppressWarnings();
$data = unserialize( $data );
wfRestoreWarnings();
if ( isset( $data['Orientation'] ) ) {
# See http://sylvana.net/jpegcrop/exif_orientation.html
switch ( $data['Orientation'] ) {
case 8:
return 90;
case 3:
return 180;
case 6:
return 270;
default:
return 0;
}
}
return 0;
}
}
|
