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         $mime_type = get_post_mime_type( $attachment );
  80
  81         if ( preg_match( '!^image/!', $mime_type ) && file_is_displayable_image( $file ) ) {
  82                 $imagesize = getimagesize( $file );
  83                 $metadata['width'] = $imagesize[0];
  84                 $metadata['height'] = $imagesize[1];
  85
  86                 // Make the file path relative to the upload dir.
  87                 $metadata['file'] = _wp_relative_upload_path($file);
  88
  89                 // Make thumbnails and other intermediate sizes.
  90                 $_wp_additional_image_sizes = wp_get_additional_image_sizes();
  91
  92                 $sizes = array();
  93                 foreach ( get_intermediate_image_sizes() as $s ) {
  94                         $sizes[$s] = array( 'width' => '', 'height' => '', 'crop' => false );
  95                         if ( isset( $_wp_additional_image_sizes[$s]['width'] ) ) {
  96                                 // For theme-added sizes
  97                                 $sizes[$s]['width'] = intval( $_wp_additional_image_sizes[$s]['width'] );
  98                         } else {
  99                                 // For default sizes set in options
 100                                 $sizes[$s]['width'] = get_option( "{$s}_size_w" );
 101                         }
 102
 103                         if ( isset( $_wp_additional_image_sizes[$s]['height'] ) ) {
 104                                 // For theme-added sizes
 105                                 $sizes[$s]['height'] = intval( $_wp_additional_image_sizes[$s]['height'] );
 106                         } else {
 107                                 // For default sizes set in options
 108                                 $sizes[$s]['height'] = get_option( "{$s}_size_h" );
 109                         }
 110
 111                         if ( isset( $_wp_additional_image_sizes[$s]['crop'] ) ) {
 112                                 // For theme-added sizes
 113                                 $sizes[$s]['crop'] = $_wp_additional_image_sizes[$s]['crop'];
 114                         } else {
 115                                 // For default sizes set in options
 116                                 $sizes[$s]['crop'] = get_option( "{$s}_crop" );
 117                         }
 118                 }
 119
 120                 /**
 121                  * Filters the image sizes automatically generated when uploading an image.
 122                  *
 123                  * @since 2.9.0
 124                  * @since 4.4.0 Added the `$metadata` argument.
 125                  *
 126                  * @param array $sizes    An associative array of image sizes.
 127                  * @param array $metadata An associative array of image metadata: width, height, file.
 128                  */
 129                 $sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes, $metadata );
 130
 131                 if ( $sizes ) {
 132                         $editor = wp_get_image_editor( $file );
 133
 134                         if ( ! is_wp_error( $editor ) )
 135                                 $metadata['sizes'] = $editor->multi_resize( $sizes );
 136                 } else {
 137                         $metadata['sizes'] = array();
 138                 }
 139
 140                 // Fetch additional metadata from EXIF/IPTC.
 141                 $image_meta = wp_read_image_metadata( $file );
 142                 if ( $image_meta )
 143                         $metadata['image_meta'] = $image_meta;
 144
 145         } elseif ( wp_attachment_is( 'video', $attachment ) ) {
 146                 $metadata = wp_read_video_metadata( $file );
 147                 $support = current_theme_supports( 'post-thumbnails', 'attachment:video' ) || post_type_supports( 'attachment:video', 'thumbnail' );
 148         } elseif ( wp_attachment_is( 'audio', $attachment ) ) {
 149                 $metadata = wp_read_audio_metadata( $file );
 150                 $support = current_theme_supports( 'post-thumbnails', 'attachment:audio' ) || post_type_supports( 'attachment:audio', 'thumbnail' );
 151         }
 152
 153         if ( $support && ! empty( $metadata['image']['data'] ) ) {
 154                 // Check for existing cover.
 155                 $hash = md5( $metadata['image']['data'] );
 156                 $posts = get_posts( array(
 157                         'fields' => 'ids',
 158                         'post_type' => 'attachment',
 159                         'post_mime_type' => $metadata['image']['mime'],
 160                         'post_status' => 'inherit',
 161                         'posts_per_page' => 1,
 162                         'meta_key' => '_cover_hash',
 163                         'meta_value' => $hash
 164                 ) );
 165                 $exists = reset( $posts );
 166
 167                 if ( ! empty( $exists ) ) {
 168                         update_post_meta( $attachment_id, '_thumbnail_id', $exists );
 169                 } else {
 170                         $ext = '.jpg';
 171                         switch ( $metadata['image']['mime'] ) {
 172                         case 'image/gif':
 173                                 $ext = '.gif';
 174                                 break;
 175                         case 'image/png':
 176                                 $ext = '.png';
 177                                 break;
 178                         }
 179                         $basename = str_replace( '.', '-', basename( $file ) ) . '-image' . $ext;
 180                         $uploaded = wp_upload_bits( $basename, '', $metadata['image']['data'] );
 181                         if ( false === $uploaded['error'] ) {
 182                                 $image_attachment = array(
 183                                         'post_mime_type' => $metadata['image']['mime'],
 184                                         'post_type' => 'attachment',
 185                                         'post_content' => '',
 186                                 );
 187                                 /**
 188                                  * Filters the parameters for the attachment thumbnail creation.
 189                                  *
 190                                  * @since 3.9.0
 191                                  *
 192                                  * @param array $image_attachment An array of parameters to create the thumbnail.
 193                                  * @param array $metadata         Current attachment metadata.
 194                                  * @param array $uploaded         An array containing the thumbnail path and url.
 195                                  */
 196                                 $image_attachment = apply_filters( 'attachment_thumbnail_args', $image_attachment, $metadata, $uploaded );
 197
 198                                 $sub_attachment_id = wp_insert_attachment( $image_attachment, $uploaded['file'] );
 199                                 add_post_meta( $sub_attachment_id, '_cover_hash', $hash );
 200                                 $attach_data = wp_generate_attachment_metadata( $sub_attachment_id, $uploaded['file'] );
 201                                 wp_update_attachment_metadata( $sub_attachment_id, $attach_data );
 202                                 update_post_meta( $attachment_id, '_thumbnail_id', $sub_attachment_id );
 203                         }
 204                 }
 205         }
 206         // Try to create image thumbnails for PDFs
 207         else if ( 'application/pdf' === $mime_type ) {
 208                 $fallback_sizes = array(
 209                         'thumbnail',
 210                         'medium',
 211                         'large',
 212                 );
 213
 214                 /**
 215                  * Filters the image sizes generated for non-image mime types.
 216                  *
 217                  * @since 4.7.0
 218                  *
 219                  * @param array $fallback_sizes An array of image size names.
 220                  */
 221                 $fallback_sizes = apply_filters( 'fallback_intermediate_image_sizes', $fallback_sizes, $metadata );
 222
 223                 $sizes = array();
 224                 $_wp_additional_image_sizes = wp_get_additional_image_sizes();
 225
 226                 foreach ( $fallback_sizes as $s ) {
 227                         if ( isset( $_wp_additional_image_sizes[ $s ]['width'] ) ) {
 228                                 $sizes[ $s ]['width'] = intval( $_wp_additional_image_sizes[ $s ]['width'] );
 229                         } else {
 230                                 $sizes[ $s ]['width'] = get_option( "{$s}_size_w" );
 231                         }
 232
 233                         if ( isset( $_wp_additional_image_sizes[ $s ]['height'] ) ) {
 234                                 $sizes[ $s ]['height'] = intval( $_wp_additional_image_sizes[ $s ]['height'] );
 235                         } else {
 236                                 $sizes[ $s ]['height'] = get_option( "{$s}_size_h" );
 237                         }
 238
 239                         if ( isset( $_wp_additional_image_sizes[ $s ]['crop'] ) ) {
 240                                 $sizes[ $s ]['crop'] = $_wp_additional_image_sizes[ $s ]['crop'];
 241                         } else {
 242                                 // Force thumbnails to be soft crops.
 243                                 if ( ! 'thumbnail' === $s ) {
 244                                         $sizes[ $s ]['crop'] = get_option( "{$s}_crop" );
 245                                 }
 246                         }
 247                 }
 248
 249                 // Only load PDFs in an image editor if we're processing sizes.
 250                 if ( ! empty( $sizes ) ) {
 251                         $editor = wp_get_image_editor( $file );
 252
 253                         if ( ! is_wp_error( $editor ) ) { // No support for this type of file
 254                                 $uploaded = $editor->save( $file, 'image/jpeg' );
 255                                 unset( $editor );
 256
 257                                 // Resize based on the full size image, rather than the source.
 258                                 if ( ! is_wp_error( $uploaded ) ) {
 259                                         $editor = wp_get_image_editor( $uploaded['path'] );
 260                                         unset( $uploaded['path'] );
 261
 262                                         if ( ! is_wp_error( $editor ) ) {
 263                                                 $metadata['sizes'] = $editor->multi_resize( $sizes );
 264                                                 $metadata['sizes']['full'] = $uploaded;
 265                                         }
 266                                 }
 267                         }
 268                 }
 269         }
 270
 271         // Remove the blob of binary data from the array.
 272         if ( $metadata ) {
 273                 unset( $metadata['image']['data'] );
 274         }
 275
 276         /**
 277          * Filters the generated attachment meta data.
 278          *
 279          * @since 2.1.0
 280          *
 281          * @param array $metadata      An array of attachment meta data.
 282          * @param int   $attachment_id Current attachment ID.
 283          */
 284         return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id );
 285 }
 286
 287 /**
 288  * Convert a fraction string to a decimal.
 289  *
 290  * @since 2.5.0
 291  *
 292  * @param string $str
 293  * @return int|float
 294  */
 295 function wp_exif_frac2dec($str) {
 296         @list( $n, $d ) = explode( '/', $str );
 297         if ( !empty($d) )
 298                 return $n / $d;
 299         return $str;
 300 }
 301
 302 /**
 303  * Convert the exif date format to a unix timestamp.
 304  *
 305  * @since 2.5.0
 306  *
 307  * @param string $str
 308  * @return int
 309  */
 310 function wp_exif_date2ts($str) {
 311         @list( $date, $time ) = explode( ' ', trim($str) );
 312         @list( $y, $m, $d ) = explode( ':', $date );
 313
 314         return strtotime( "{$y}-{$m}-{$d} {$time}" );
 315 }
 316
 317 /**
 318  * Get extended image metadata, exif or iptc as available.
 319  *
 320  * Retrieves the EXIF metadata aperture, credit, camera, caption, copyright, iso
 321  * created_timestamp, focal_length, shutter_speed, and title.
 322  *
 323  * The IPTC metadata that is retrieved is APP13, credit, byline, created date
 324  * and time, caption, copyright, and title. Also includes FNumber, Model,
 325  * DateTimeDigitized, FocalLength, ISOSpeedRatings, and ExposureTime.
 326  *
 327  * @todo Try other exif libraries if available.
 328  * @since 2.5.0
 329  *
 330  * @param string $file
 331  * @return bool|array False on failure. Image metadata array on success.
 332  */
 333 function wp_read_image_metadata( $file ) {
 334         if ( ! file_exists( $file ) )
 335                 return false;
 336
 337         list( , , $sourceImageType ) = getimagesize( $file );
 338
 339         /*
 340          * EXIF contains a bunch of data we'll probably never need formatted in ways
 341          * that are difficult to use. We'll normalize it and just extract the fields
 342          * that are likely to be useful. Fractions and numbers are converted to
 343          * floats, dates to unix timestamps, and everything else to strings.
 344          */
 345         $meta = array(
 346                 'aperture' => 0,
 347                 'credit' => '',
 348                 'camera' => '',
 349                 'caption' => '',
 350                 'created_timestamp' => 0,
 351                 'copyright' => '',
 352                 'focal_length' => 0,
 353                 'iso' => 0,
 354                 'shutter_speed' => 0,
 355                 'title' => '',
 356                 'orientation' => 0,
 357                 'keywords' => array(),
 358         );
 359
 360         $iptc = array();
 361         /*
 362          * Read IPTC first, since it might contain data not available in exif such
 363          * as caption, description etc.
 364          */
 365         if ( is_callable( 'iptcparse' ) ) {
 366                 getimagesize( $file, $info );
 367
 368                 if ( ! empty( $info['APP13'] ) ) {
 369                         $iptc = iptcparse( $info['APP13'] );
 370
 371                         // Headline, "A brief synopsis of the caption."
 372                         if ( ! empty( $iptc['2#105'][0] ) ) {
 373                                 $meta['title'] = trim( $iptc['2#105'][0] );
 374                         /*
 375                          * Title, "Many use the Title field to store the filename of the image,
 376                          * though the field may be used in many ways."
 377                          */
 378                         } elseif ( ! empty( $iptc['2#005'][0] ) ) {
 379                                 $meta['title'] = trim( $iptc['2#005'][0] );
 380                         }
 381
 382                         if ( ! empty( $iptc['2#120'][0] ) ) { // description / legacy caption
 383                                 $caption = trim( $iptc['2#120'][0] );
 384
 385                                 mbstring_binary_safe_encoding();
 386                                 $caption_length = strlen( $caption );
 387                                 reset_mbstring_encoding();
 388
 389                                 if ( empty( $meta['title'] ) && $caption_length < 80 ) {
 390                                         // Assume the title is stored in 2:120 if it's short.
 391                                         $meta['title'] = $caption;
 392                                 }
 393
 394                                 $meta['caption'] = $caption;
 395                         }
 396
 397                         if ( ! empty( $iptc['2#110'][0] ) ) // credit
 398                                 $meta['credit'] = trim( $iptc['2#110'][0] );
 399                         elseif ( ! empty( $iptc['2#080'][0] ) ) // creator / legacy byline
 400                                 $meta['credit'] = trim( $iptc['2#080'][0] );
 401
 402                         if ( ! empty( $iptc['2#055'][0] ) && ! empty( $iptc['2#060'][0] ) ) // created date and time
 403                                 $meta['created_timestamp'] = strtotime( $iptc['2#055'][0] . ' ' . $iptc['2#060'][0] );
 404
 405                         if ( ! empty( $iptc['2#116'][0] ) ) // copyright
 406                                 $meta['copyright'] = trim( $iptc['2#116'][0] );
 407
 408                         if ( ! empty( $iptc['2#025'][0] ) ) { // keywords array
 409                                 $meta['keywords'] = array_values( $iptc['2#025'] );
 410                         }
 411                  }
 412         }
 413
 414         /**
 415          * Filters the image types to check for exif data.
 416          *
 417          * @since 2.5.0
 418          *
 419          * @param array $image_types Image types to check for exif data.
 420          */
 421         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 ) ) ) ) {
 422                 $exif = @exif_read_data( $file );
 423
 424                 if ( ! empty( $exif['ImageDescription'] ) ) {
 425                         mbstring_binary_safe_encoding();
 426                         $description_length = strlen( $exif['ImageDescription'] );
 427                         reset_mbstring_encoding();
 428
 429                         if ( empty( $meta['title'] ) && $description_length < 80 ) {
 430                                 // Assume the title is stored in ImageDescription
 431                                 $meta['title'] = trim( $exif['ImageDescription'] );
 432                         }
 433
 434                         if ( empty( $meta['caption'] ) && ! empty( $exif['COMPUTED']['UserComment'] ) ) {
 435                                 $meta['caption'] = trim( $exif['COMPUTED']['UserComment'] );
 436                         }
 437
 438                         if ( empty( $meta['caption'] ) ) {
 439                                 $meta['caption'] = trim( $exif['ImageDescription'] );
 440                         }
 441                 } elseif ( empty( $meta['caption'] ) && ! empty( $exif['Comments'] ) ) {
 442                         $meta['caption'] = trim( $exif['Comments'] );
 443                 }
 444
 445                 if ( empty( $meta['credit'] ) ) {
 446                         if ( ! empty( $exif['Artist'] ) ) {
 447                                 $meta['credit'] = trim( $exif['Artist'] );
 448                         } elseif ( ! empty($exif['Author'] ) ) {
 449                                 $meta['credit'] = trim( $exif['Author'] );
 450                         }
 451                 }
 452
 453                 if ( empty( $meta['copyright'] ) && ! empty( $exif['Copyright'] ) ) {
 454                         $meta['copyright'] = trim( $exif['Copyright'] );
 455                 }
 456                 if ( ! empty( $exif['FNumber'] ) ) {
 457                         $meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 );
 458                 }
 459                 if ( ! empty( $exif['Model'] ) ) {
 460                         $meta['camera'] = trim( $exif['Model'] );
 461                 }
 462                 if ( empty( $meta['created_timestamp'] ) && ! empty( $exif['DateTimeDigitized'] ) ) {
 463                         $meta['created_timestamp'] = wp_exif_date2ts( $exif['DateTimeDigitized'] );
 464                 }
 465                 if ( ! empty( $exif['FocalLength'] ) ) {
 466                         $meta['focal_length'] = (string) wp_exif_frac2dec( $exif['FocalLength'] );
 467                 }
 468                 if ( ! empty( $exif['ISOSpeedRatings'] ) ) {
 469                         $meta['iso'] = is_array( $exif['ISOSpeedRatings'] ) ? reset( $exif['ISOSpeedRatings'] ) : $exif['ISOSpeedRatings'];
 470                         $meta['iso'] = trim( $meta['iso'] );
 471                 }
 472                 if ( ! empty( $exif['ExposureTime'] ) ) {
 473                         $meta['shutter_speed'] = (string) wp_exif_frac2dec( $exif['ExposureTime'] );
 474                 }
 475                 if ( ! empty( $exif['Orientation'] ) ) {
 476                         $meta['orientation'] = $exif['Orientation'];
 477                 }
 478         }
 479
 480         foreach ( array( 'title', 'caption', 'credit', 'copyright', 'camera', 'iso' ) as $key ) {
 481                 if ( $meta[ $key ] && ! seems_utf8( $meta[ $key ] ) ) {
 482                         $meta[ $key ] = utf8_encode( $meta[ $key ] );
 483                 }
 484         }
 485
 486         foreach ( $meta['keywords'] as $key => $keyword ) {
 487                 if ( ! seems_utf8( $keyword ) ) {
 488                         $meta['keywords'][ $key ] = utf8_encode( $keyword );
 489                 }
 490         }
 491
 492         $meta = wp_kses_post_deep( $meta );
 493
 494         /**
 495          * Filters the array of meta data read from an image's exif data.
 496          *
 497          * @since 2.5.0
 498          * @since 4.4.0 The `$iptc` parameter was added.
 499          *
 500          * @param array  $meta            Image meta data.
 501          * @param string $file            Path to image file.
 502          * @param int    $sourceImageType Type of image.
 503          * @param array  $iptc            IPTC data.
 504          */
 505         return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType, $iptc );
 506
 507 }
 508
 509 /**
 510  * Validate that file is an image.
 511  *
 512  * @since 2.5.0
 513  *
 514  * @param string $path File path to test if valid image.
 515  * @return bool True if valid image, false if not valid image.
 516  */
 517 function file_is_valid_image($path) {
 518         $size = @getimagesize($path);
 519         return !empty($size);
 520 }
 521
 522 /**
 523  * Validate that file is suitable for displaying within a web page.
 524  *
 525  * @since 2.5.0
 526  *
 527  * @param string $path File path to test.
 528  * @return bool True if suitable, false if not suitable.
 529  */
 530 function file_is_displayable_image($path) {
 531         $displayable_image_types = array( IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_BMP );
 532
 533         $info = @getimagesize( $path );
 534         if ( empty( $info ) ) {
 535                 $result = false;
 536         } elseif ( ! in_array( $info[2], $displayable_image_types ) ) {
 537                 $result = false;
 538         } else {
 539                 $result = true;
 540         }
 541
 542         /**
 543          * Filters whether the current image is displayable in the browser.
 544          *
 545          * @since 2.5.0
 546          *
 547          * @param bool   $result Whether the image can be displayed. Default true.
 548          * @param string $path   Path to the image.
 549          */
 550         return apply_filters( 'file_is_displayable_image', $result, $path );
 551 }
 552
 553 /**
 554  * Load an image resource for editing.
 555  *
 556  * @since 2.9.0
 557  *
 558  * @param string $attachment_id Attachment ID.
 559  * @param string $mime_type Image mime type.
 560  * @param string $size Optional. Image size, defaults to 'full'.
 561  * @return resource|false The resulting image resource on success, false on failure.
 562  */
 563 function load_image_to_edit( $attachment_id, $mime_type, $size = 'full' ) {
 564         $filepath = _load_image_to_edit_path( $attachment_id, $size );
 565         if ( empty( $filepath ) )
 566                 return false;
 567
 568         switch ( $mime_type ) {
 569                 case 'image/jpeg':
 570                         $image = imagecreatefromjpeg($filepath);
 571                         break;
 572                 case 'image/png':
 573                         $image = imagecreatefrompng($filepath);
 574                         break;
 575                 case 'image/gif':
 576                         $image = imagecreatefromgif($filepath);
 577                         break;
 578                 default:
 579                         $image = false;
 580                         break;
 581         }
 582         if ( is_resource($image) ) {
 583                 /**
 584                  * Filters the current image being loaded for editing.
 585                  *
 586                  * @since 2.9.0
 587                  *
 588                  * @param resource $image         Current image.
 589                  * @param string   $attachment_id Attachment ID.
 590                  * @param string   $size          Image size.
 591                  */
 592                 $image = apply_filters( 'load_image_to_edit', $image, $attachment_id, $size );
 593                 if ( function_exists('imagealphablending') && function_exists('imagesavealpha') ) {
 594                         imagealphablending($image, false);
 595                         imagesavealpha($image, true);
 596                 }
 597         }
 598         return $image;
 599 }
 600
 601 /**
 602  * Retrieve the path or url of an attachment's attached file.
 603  *
 604  * If the attached file is not present on the local filesystem (usually due to replication plugins),
 605  * then the url of the file is returned if url fopen is supported.
 606  *
 607  * @since 3.4.0
 608  * @access private
 609  *
 610  * @param string $attachment_id Attachment ID.
 611  * @param string $size Optional. Image size, defaults to 'full'.
 612  * @return string|false File path or url on success, false on failure.
 613  */
 614 function _load_image_to_edit_path( $attachment_id, $size = 'full' ) {
 615         $filepath = get_attached_file( $attachment_id );
 616
 617         if ( $filepath && file_exists( $filepath ) ) {
 618                 if ( 'full' != $size && ( $data = image_get_intermediate_size( $attachment_id, $size ) ) ) {
 619                         /**
 620                          * Filters the path to the current image.
 621                          *
 622                          * The filter is evaluated for all image sizes except 'full'.
 623                          *
 624                          * @since 3.1.0
 625                          *
 626                          * @param string $path          Path to the current image.
 627                          * @param string $attachment_id Attachment ID.
 628                          * @param string $size          Size of the image.
 629                          */
 630                         $filepath = apply_filters( 'load_image_to_edit_filesystempath', path_join( dirname( $filepath ), $data['file'] ), $attachment_id, $size );
 631                 }
 632         } elseif ( function_exists( 'fopen' ) && true == ini_get( 'allow_url_fopen' ) ) {
 633                 /**
 634                  * Filters the image URL if not in the local filesystem.
 635                  *
 636                  * The filter is only evaluated if fopen is enabled on the server.
 637                  *
 638                  * @since 3.1.0
 639                  *
 640                  * @param string $image_url     Current image URL.
 641                  * @param string $attachment_id Attachment ID.
 642                  * @param string $size          Size of the image.
 643                  */
 644                 $filepath = apply_filters( 'load_image_to_edit_attachmenturl', wp_get_attachment_url( $attachment_id ), $attachment_id, $size );
 645         }
 646
 647         /**
 648          * Filters the returned path or URL of the current image.
 649          *
 650          * @since 2.9.0
 651          *
 652          * @param string|bool $filepath      File path or URL to current image, or false.
 653          * @param string      $attachment_id Attachment ID.
 654          * @param string      $size          Size of the image.
 655          */
 656         return apply_filters( 'load_image_to_edit_path', $filepath, $attachment_id, $size );
 657 }
 658
 659 /**
 660  * Copy an existing image file.
 661  *
 662  * @since 3.4.0
 663  * @access private
 664  *
 665  * @param string $attachment_id Attachment ID.
 666  * @return string|false New file path on success, false on failure.
 667  */
 668 function _copy_image_file( $attachment_id ) {
 669         $dst_file = $src_file = get_attached_file( $attachment_id );
 670         if ( ! file_exists( $src_file ) )
 671                 $src_file = _load_image_to_edit_path( $attachment_id );
 672
 673         if ( $src_file ) {
 674                 $dst_file = str_replace( basename( $dst_file ), 'copy-' . basename( $dst_file ), $dst_file );
 675                 $dst_file = dirname( $dst_file ) . '/' . wp_unique_filename( dirname( $dst_file ), basename( $dst_file ) );
 676
 677                 /*
 678                  * The directory containing the original file may no longer
 679                  * exist when using a replication plugin.
 680                  */
 681                 wp_mkdir_p( dirname( $dst_file ) );
 682
 683                 if ( ! @copy( $src_file, $dst_file ) )
 684                         $dst_file = false;
 685         } else {
 686                 $dst_file = false;
 687         }
 688
 689         return $dst_file;
 690 }