WordPress 4.0
[autoinstalls/wordpress.git] / wp-admin / includes / image.php
1 <?php
2 /**
3  * File contains all the administration image manipulation functions.
4  *
5  * @package WordPress
6  * @subpackage Administration
7  */
8
9 /**
10  * Crop an Image to a given size.
11  *
12  * @since 2.1.0
13  *
14  * @param string|int $src The source file or Attachment ID.
15  * @param int $src_x The start x position to crop from.
16  * @param int $src_y The start y position to crop from.
17  * @param int $src_w The width to crop.
18  * @param int $src_h The height to crop.
19  * @param int $dst_w The destination width.
20  * @param int $dst_h The destination height.
21  * @param int $src_abs Optional. If the source crop points are absolute.
22  * @param string $dst_file Optional. The destination file to write to.
23  * @return string|WP_Error New filepath on success, WP_Error on failure.
24  */
25 function wp_crop_image( $src, $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs = false, $dst_file = false ) {
26         $src_file = $src;
27         if ( is_numeric( $src ) ) { // Handle int as attachment ID
28                 $src_file = get_attached_file( $src );
29
30                 if ( ! file_exists( $src_file ) ) {
31                         // If the file doesn't exist, attempt a url fopen on the src link.
32                         // This can occur with certain file replication plugins.
33                         $src = _load_image_to_edit_path( $src, 'full' );
34                 } else {
35                         $src = $src_file;
36                 }
37         }
38
39         $editor = wp_get_image_editor( $src );
40         if ( is_wp_error( $editor ) )
41                 return $editor;
42
43         $src = $editor->crop( $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs );
44         if ( is_wp_error( $src ) )
45                 return $src;
46
47         if ( ! $dst_file )
48                 $dst_file = str_replace( basename( $src_file ), 'cropped-' . basename( $src_file ), $src_file );
49
50         /*
51          * The directory containing the original file may no longer exist when
52          * using a replication plugin.
53          */
54         wp_mkdir_p( dirname( $dst_file ) );
55
56         $dst_file = dirname( $dst_file ) . '/' . wp_unique_filename( dirname( $dst_file ), basename( $dst_file ) );
57
58         $result = $editor->save( $dst_file );
59         if ( is_wp_error( $result ) )
60                 return $result;
61
62         return $dst_file;
63 }
64
65 /**
66  * Generate post thumbnail attachment meta data.
67  *
68  * @since 2.1.0
69  *
70  * @param int $attachment_id Attachment Id to process.
71  * @param string $file Filepath of the Attached image.
72  * @return mixed Metadata for attachment.
73  */
74 function wp_generate_attachment_metadata( $attachment_id, $file ) {
75         $attachment = get_post( $attachment_id );
76
77         $metadata = array();
78         $support = false;
79         if ( preg_match('!^image/!', get_post_mime_type( $attachment )) && file_is_displayable_image($file) ) {
80                 $imagesize = getimagesize( $file );
81                 $metadata['width'] = $imagesize[0];
82                 $metadata['height'] = $imagesize[1];
83
84                 // Make the file path relative to the upload dir.
85                 $metadata['file'] = _wp_relative_upload_path($file);
86
87                 // Make thumbnails and other intermediate sizes.
88                 global $_wp_additional_image_sizes;
89
90                 $sizes = array();
91                 foreach ( get_intermediate_image_sizes() as $s ) {
92                         $sizes[$s] = array( 'width' => '', 'height' => '', 'crop' => false );
93                         if ( isset( $_wp_additional_image_sizes[$s]['width'] ) )
94                                 $sizes[$s]['width'] = intval( $_wp_additional_image_sizes[$s]['width'] ); // For theme-added sizes
95                         else
96                                 $sizes[$s]['width'] = get_option( "{$s}_size_w" ); // For default sizes set in options
97                         if ( isset( $_wp_additional_image_sizes[$s]['height'] ) )
98                                 $sizes[$s]['height'] = intval( $_wp_additional_image_sizes[$s]['height'] ); // For theme-added sizes
99                         else
100                                 $sizes[$s]['height'] = get_option( "{$s}_size_h" ); // For default sizes set in options
101                         if ( isset( $_wp_additional_image_sizes[$s]['crop'] ) )
102                                 $sizes[$s]['crop'] = $_wp_additional_image_sizes[$s]['crop']; // For theme-added sizes
103                         else
104                                 $sizes[$s]['crop'] = get_option( "{$s}_crop" ); // For default sizes set in options
105                 }
106
107                 /**
108                  * Filter the image sizes automatically generated when uploading an image.
109                  *
110                  * @since 2.9.0
111                  *
112                  * @param array $sizes An associative array of image sizes.
113                  */
114                 $sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes );
115
116                 if ( $sizes ) {
117                         $editor = wp_get_image_editor( $file );
118
119                         if ( ! is_wp_error( $editor ) )
120                                 $metadata['sizes'] = $editor->multi_resize( $sizes );
121                 } else {
122                         $metadata['sizes'] = array();
123                 }
124
125                 // Fetch additional metadata from EXIF/IPTC.
126                 $image_meta = wp_read_image_metadata( $file );
127                 if ( $image_meta )
128                         $metadata['image_meta'] = $image_meta;
129
130         } elseif ( preg_match( '#^video/#', get_post_mime_type( $attachment ) ) ) {
131                 $metadata = wp_read_video_metadata( $file );
132                 $support = current_theme_supports( 'post-thumbnails', 'attachment:video' ) || post_type_supports( 'attachment:video', 'thumbnail' );
133         } elseif ( preg_match( '#^audio/#', get_post_mime_type( $attachment ) ) ) {
134                 $metadata = wp_read_audio_metadata( $file );
135                 $support = current_theme_supports( 'post-thumbnails', 'attachment:audio' ) || post_type_supports( 'attachment:audio', 'thumbnail' );
136         }
137
138         if ( $support && ! empty( $metadata['image']['data'] ) ) {
139                 // Check for existing cover.
140                 $hash = md5( $metadata['image']['data'] );
141                 $posts = get_posts( array(
142                         'fields' => 'ids',
143                         'post_type' => 'attachment',
144                         'post_mime_type' => $metadata['image']['mime'],
145                         'post_status' => 'inherit',
146                         'posts_per_page' => 1,
147                         'meta_key' => '_cover_hash',
148                         'meta_value' => $hash
149                 ) );
150                 $exists = reset( $posts );
151
152                 if ( ! empty( $exists ) ) {
153                         update_post_meta( $attachment_id, '_thumbnail_id', $exists );
154                 } else {
155                         $ext = '.jpg';
156                         switch ( $metadata['image']['mime'] ) {
157                         case 'image/gif':
158                                 $ext = '.gif';
159                                 break;
160                         case 'image/png':
161                                 $ext = '.png';
162                                 break;
163                         }
164                         $basename = str_replace( '.', '-', basename( $file ) ) . '-image' . $ext;
165                         $uploaded = wp_upload_bits( $basename, '', $metadata['image']['data'] );
166                         if ( false === $uploaded['error'] ) {
167                                 $image_attachment = array(
168                                         'post_mime_type' => $metadata['image']['mime'],
169                                         'post_type' => 'attachment',
170                                         'post_content' => '',
171                                 );
172                                 /**
173                                  * Filter the parameters for the attachment thumbnail creation.
174                                  *
175                                  * @since 3.9.0
176                                  *
177                                  * @param array $image_attachment An array of parameters to create the thumbnail.
178                                  * @param array $metadata         Current attachment metadata.
179                                  * @param array $uploaded         An array containing the thumbnail path and url.
180                                  */
181                                 $image_attachment = apply_filters( 'attachment_thumbnail_args', $image_attachment, $metadata, $uploaded );
182
183                                 $sub_attachment_id = wp_insert_attachment( $image_attachment, $uploaded['file'] );
184                                 add_post_meta( $sub_attachment_id, '_cover_hash', $hash );
185                                 $attach_data = wp_generate_attachment_metadata( $sub_attachment_id, $uploaded['file'] );
186                                 wp_update_attachment_metadata( $sub_attachment_id, $attach_data );
187                                 update_post_meta( $attachment_id, '_thumbnail_id', $sub_attachment_id );
188                         }
189                 }
190         }
191
192         // Remove the blob of binary data from the array.
193         if ( isset( $metadata['image']['data'] ) )
194                 unset( $metadata['image']['data'] );
195
196         /**
197          * Filter the generated attachment meta data.
198          *
199          * @since 2.1.0
200          *
201          * @param array $metadata      An array of attachment meta data.
202          * @param int   $attachment_id Current attachment ID.
203          */
204         return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id );
205 }
206
207 /**
208  * Convert a fraction string to a decimal.
209  *
210  * @since 2.5.0
211  *
212  * @param string $str
213  * @return int|float
214  */
215 function wp_exif_frac2dec($str) {
216         @list( $n, $d ) = explode( '/', $str );
217         if ( !empty($d) )
218                 return $n / $d;
219         return $str;
220 }
221
222 /**
223  * Convert the exif date format to a unix timestamp.
224  *
225  * @since 2.5.0
226  *
227  * @param string $str
228  * @return int
229  */
230 function wp_exif_date2ts($str) {
231         @list( $date, $time ) = explode( ' ', trim($str) );
232         @list( $y, $m, $d ) = explode( ':', $date );
233
234         return strtotime( "{$y}-{$m}-{$d} {$time}" );
235 }
236
237 /**
238  * Get extended image metadata, exif or iptc as available.
239  *
240  * Retrieves the EXIF metadata aperture, credit, camera, caption, copyright, iso
241  * created_timestamp, focal_length, shutter_speed, and title.
242  *
243  * The IPTC metadata that is retrieved is APP13, credit, byline, created date
244  * and time, caption, copyright, and title. Also includes FNumber, Model,
245  * DateTimeDigitized, FocalLength, ISOSpeedRatings, and ExposureTime.
246  *
247  * @todo Try other exif libraries if available.
248  * @since 2.5.0
249  *
250  * @param string $file
251  * @return bool|array False on failure. Image metadata array on success.
252  */
253 function wp_read_image_metadata( $file ) {
254         if ( ! file_exists( $file ) )
255                 return false;
256
257         list( , , $sourceImageType ) = getimagesize( $file );
258
259         /*
260          * EXIF contains a bunch of data we'll probably never need formatted in ways
261          * that are difficult to use. We'll normalize it and just extract the fields
262          * that are likely to be useful. Fractions and numbers are converted to
263          * floats, dates to unix timestamps, and everything else to strings.
264          */
265         $meta = array(
266                 'aperture' => 0,
267                 'credit' => '',
268                 'camera' => '',
269                 'caption' => '',
270                 'created_timestamp' => 0,
271                 'copyright' => '',
272                 'focal_length' => 0,
273                 'iso' => 0,
274                 'shutter_speed' => 0,
275                 'title' => '',
276                 'orientation' => 0,
277         );
278
279         /*
280          * Read IPTC first, since it might contain data not available in exif such
281          * as caption, description etc.
282          */
283         if ( is_callable( 'iptcparse' ) ) {
284                 getimagesize( $file, $info );
285
286                 if ( ! empty( $info['APP13'] ) ) {
287                         $iptc = iptcparse( $info['APP13'] );
288
289                         // Headline, "A brief synopsis of the caption."
290                         if ( ! empty( $iptc['2#105'][0] ) ) {
291                                 $meta['title'] = trim( $iptc['2#105'][0] );
292                         /*
293                          * Title, "Many use the Title field to store the filename of the image,
294                          * though the field may be used in many ways."
295                          */
296                         } elseif ( ! empty( $iptc['2#005'][0] ) ) {
297                                 $meta['title'] = trim( $iptc['2#005'][0] );
298                         }
299
300                         if ( ! empty( $iptc['2#120'][0] ) ) { // description / legacy caption
301                                 $caption = trim( $iptc['2#120'][0] );
302                                 if ( empty( $meta['title'] ) ) {
303                                         mbstring_binary_safe_encoding();
304                                         $caption_length = strlen( $caption );
305                                         reset_mbstring_encoding();
306
307                                         // Assume the title is stored in 2:120 if it's short.
308                                         if ( $caption_length < 80 ) {
309                                                 $meta['title'] = $caption;
310                                         } else {
311                                                 $meta['caption'] = $caption;
312                                         }
313                                 } elseif ( $caption != $meta['title'] ) {
314                                         $meta['caption'] = $caption;
315                                 }
316                         }
317
318                         if ( ! empty( $iptc['2#110'][0] ) ) // credit
319                                 $meta['credit'] = trim( $iptc['2#110'][0] );
320                         elseif ( ! empty( $iptc['2#080'][0] ) ) // creator / legacy byline
321                                 $meta['credit'] = trim( $iptc['2#080'][0] );
322
323                         if ( ! empty( $iptc['2#055'][0] ) and ! empty( $iptc['2#060'][0] ) ) // created date and time
324                                 $meta['created_timestamp'] = strtotime( $iptc['2#055'][0] . ' ' . $iptc['2#060'][0] );
325
326                         if ( ! empty( $iptc['2#116'][0] ) ) // copyright
327                                 $meta['copyright'] = trim( $iptc['2#116'][0] );
328                  }
329         }
330
331         /**
332          * Filter the image types to check for exif data.
333          *
334          * @since 2.5.0
335          *
336          * @param array $image_types Image types to check for exif data.
337          */
338         if ( is_callable( 'exif_read_data' ) && in_array( $sourceImageType, apply_filters( 'wp_read_image_metadata_types', array( IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM ) ) ) ) {
339                 $exif = @exif_read_data( $file );
340
341                 if ( empty( $meta['title'] ) && ! empty( $exif['Title'] ) ) {
342                         $meta['title'] = trim( $exif['Title'] );
343                 }
344
345                 if ( ! empty( $exif['ImageDescription'] ) ) {
346                         mbstring_binary_safe_encoding();
347                         $description_length = strlen( $exif['ImageDescription'] );
348                         reset_mbstring_encoding();
349
350                         if ( empty( $meta['title'] ) && $description_length < 80 ) {
351                                 // Assume the title is stored in ImageDescription
352                                 $meta['title'] = trim( $exif['ImageDescription'] );
353                                 if ( empty( $meta['caption'] ) && ! empty( $exif['COMPUTED']['UserComment'] ) && trim( $exif['COMPUTED']['UserComment'] ) != $meta['title'] ) {
354                                         $meta['caption'] = trim( $exif['COMPUTED']['UserComment'] );
355                                 }
356                         } elseif ( empty( $meta['caption'] ) && trim( $exif['ImageDescription'] ) != $meta['title'] ) {
357                                 $meta['caption'] = trim( $exif['ImageDescription'] );
358                         }
359                 } elseif ( empty( $meta['caption'] ) && ! empty( $exif['Comments'] ) && trim( $exif['Comments'] ) != $meta['title'] ) {
360                         $meta['caption'] = trim( $exif['Comments'] );
361                 }
362
363                 if ( empty( $meta['credit'] ) ) {
364                         if ( ! empty( $exif['Artist'] ) ) {
365                                 $meta['credit'] = trim( $exif['Artist'] );
366                         } elseif ( ! empty($exif['Author'] ) ) {
367                                 $meta['credit'] = trim( $exif['Author'] );
368                         }
369                 }
370
371                 if ( empty( $meta['copyright'] ) && ! empty( $exif['Copyright'] ) ) {
372                         $meta['copyright'] = trim( $exif['Copyright'] );
373                 }
374                 if ( ! empty( $exif['FNumber'] ) ) {
375                         $meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 );
376                 }
377                 if ( ! empty( $exif['Model'] ) ) {
378                         $meta['camera'] = trim( $exif['Model'] );
379                 }
380                 if ( empty( $meta['created_timestamp'] ) && ! empty( $exif['DateTimeDigitized'] ) ) {
381                         $meta['created_timestamp'] = wp_exif_date2ts( $exif['DateTimeDigitized'] );
382                 }
383                 if ( ! empty( $exif['FocalLength'] ) ) {
384                         $meta['focal_length'] = (string) wp_exif_frac2dec( $exif['FocalLength'] );
385                 }
386                 if ( ! empty( $exif['ISOSpeedRatings'] ) ) {
387                         $meta['iso'] = is_array( $exif['ISOSpeedRatings'] ) ? reset( $exif['ISOSpeedRatings'] ) : $exif['ISOSpeedRatings'];
388                         $meta['iso'] = trim( $meta['iso'] );
389                 }
390                 if ( ! empty( $exif['ExposureTime'] ) ) {
391                         $meta['shutter_speed'] = (string) wp_exif_frac2dec( $exif['ExposureTime'] );
392                 }
393                 if ( ! empty( $exif['Orientation'] ) ) {
394                         $meta['orientation'] = $exif['Orientation'];
395                 }
396         }
397
398         foreach ( array( 'title', 'caption', 'credit', 'copyright', 'camera', 'iso' ) as $key ) {
399                 if ( $meta[ $key ] && ! seems_utf8( $meta[ $key ] ) ) {
400                         $meta[ $key ] = utf8_encode( $meta[ $key ] );
401                 }
402         }
403
404         /**
405          * Filter the array of meta data read from an image's exif data.
406          *
407          * @since 2.5.0
408          *
409          * @param array  $meta            Image meta data.
410          * @param string $file            Path to image file.
411          * @param int    $sourceImageType Type of image.
412          */
413         return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType );
414
415 }
416
417 /**
418  * Validate that file is an image.
419  *
420  * @since 2.5.0
421  *
422  * @param string $path File path to test if valid image.
423  * @return bool True if valid image, false if not valid image.
424  */
425 function file_is_valid_image($path) {
426         $size = @getimagesize($path);
427         return !empty($size);
428 }
429
430 /**
431  * Validate that file is suitable for displaying within a web page.
432  *
433  * @since 2.5.0
434  *
435  * @param string $path File path to test.
436  * @return bool True if suitable, false if not suitable.
437  */
438 function file_is_displayable_image($path) {
439         $displayable_image_types = array( IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_BMP );
440
441         $info = @getimagesize( $path );
442         if ( empty( $info ) ) {
443                 $result = false;
444         } elseif ( ! in_array( $info[2], $displayable_image_types ) ) {
445                 $result = false;
446         } else {
447                 $result = true;
448         }
449
450         /**
451          * Filter whether the current image is displayable in the browser.
452          *
453          * @since 2.5.0
454          *
455          * @param bool   $result Whether the image can be displayed. Default true.
456          * @param string $path   Path to the image.
457          */
458         return apply_filters( 'file_is_displayable_image', $result, $path );
459 }
460
461 /**
462  * Load an image resource for editing.
463  *
464  * @since 2.9.0
465  *
466  * @param string $attachment_id Attachment ID.
467  * @param string $mime_type Image mime type.
468  * @param string $size Optional. Image size, defaults to 'full'.
469  * @return resource|false The resulting image resource on success, false on failure.
470  */
471 function load_image_to_edit( $attachment_id, $mime_type, $size = 'full' ) {
472         $filepath = _load_image_to_edit_path( $attachment_id, $size );
473         if ( empty( $filepath ) )
474                 return false;
475
476         switch ( $mime_type ) {
477                 case 'image/jpeg':
478                         $image = imagecreatefromjpeg($filepath);
479                         break;
480                 case 'image/png':
481                         $image = imagecreatefrompng($filepath);
482                         break;
483                 case 'image/gif':
484                         $image = imagecreatefromgif($filepath);
485                         break;
486                 default:
487                         $image = false;
488                         break;
489         }
490         if ( is_resource($image) ) {
491                 /**
492                  * Filter the current image being loaded for editing.
493                  *
494                  * @since 2.9.0
495                  *
496                  * @param resource $image         Current image.
497                  * @param string   $attachment_id Attachment ID.
498                  * @param string   $size          Image size.
499                  */
500                 $image = apply_filters( 'load_image_to_edit', $image, $attachment_id, $size );
501                 if ( function_exists('imagealphablending') && function_exists('imagesavealpha') ) {
502                         imagealphablending($image, false);
503                         imagesavealpha($image, true);
504                 }
505         }
506         return $image;
507 }
508
509 /**
510  * Retrieve the path or url of an attachment's attached file.
511  *
512  * If the attached file is not present on the local filesystem (usually due to replication plugins),
513  * then the url of the file is returned if url fopen is supported.
514  *
515  * @since 3.4.0
516  * @access private
517  *
518  * @param string $attachment_id Attachment ID.
519  * @param string $size Optional. Image size, defaults to 'full'.
520  * @return string|false File path or url on success, false on failure.
521  */
522 function _load_image_to_edit_path( $attachment_id, $size = 'full' ) {
523         $filepath = get_attached_file( $attachment_id );
524
525         if ( $filepath && file_exists( $filepath ) ) {
526                 if ( 'full' != $size && ( $data = image_get_intermediate_size( $attachment_id, $size ) ) ) {
527                         /**
528                          * Filter the path to the current image.
529                          *
530                          * The filter is evaluated for all image sizes except 'full'.
531                          *
532                          * @since 3.1.0
533                          *
534                          * @param string $path          Path to the current image.
535                          * @param string $attachment_id Attachment ID.
536                          * @param string $size          Size of the image.
537                          */
538                         $filepath = apply_filters( 'load_image_to_edit_filesystempath', path_join( dirname( $filepath ), $data['file'] ), $attachment_id, $size );
539                 }
540         } elseif ( function_exists( 'fopen' ) && function_exists( 'ini_get' ) && true == ini_get( 'allow_url_fopen' ) ) {
541                 /**
542                  * Filter the image URL if not in the local filesystem.
543                  *
544                  * The filter is only evaluated if fopen is enabled on the server.
545                  *
546                  * @since 3.1.0
547                  *
548                  * @param string $image_url     Current image URL.
549                  * @param string $attachment_id Attachment ID.
550                  * @param string $size          Size of the image.
551                  */
552                 $filepath = apply_filters( 'load_image_to_edit_attachmenturl', wp_get_attachment_url( $attachment_id ), $attachment_id, $size );
553         }
554
555         /**
556          * Filter the returned path or URL of the current image.
557          *
558          * @since 2.9.0
559          *
560          * @param string|bool $filepath      File path or URL to current image, or false.
561          * @param string      $attachment_id Attachment ID.
562          * @param string      $size          Size of the image.
563          */
564         return apply_filters( 'load_image_to_edit_path', $filepath, $attachment_id, $size );
565 }
566
567 /**
568  * Copy an existing image file.
569  *
570  * @since 3.4.0
571  * @access private
572  *
573  * @param string $attachment_id Attachment ID.
574  * @return string|false New file path on success, false on failure.
575  */
576 function _copy_image_file( $attachment_id ) {
577         $dst_file = $src_file = get_attached_file( $attachment_id );
578         if ( ! file_exists( $src_file ) )
579                 $src_file = _load_image_to_edit_path( $attachment_id );
580
581         if ( $src_file ) {
582                 $dst_file = str_replace( basename( $dst_file ), 'copy-' . basename( $dst_file ), $dst_file );
583                 $dst_file = dirname( $dst_file ) . '/' . wp_unique_filename( dirname( $dst_file ), basename( $dst_file ) );
584
585                 /*
586                  * The directory containing the original file may no longer
587                  * exist when using a replication plugin.
588                  */
589                 wp_mkdir_p( dirname( $dst_file ) );
590
591                 if ( ! @copy( $src_file, $dst_file ) )
592                         $dst_file = false;
593         } else {
594                 $dst_file = false;
595         }
596
597         return $dst_file;
598 }