WordPress 4.0
[autoinstalls/wordpress.git] / wp-admin / includes / image.php
index 8de2907994ed1613f36a3068ec96aab306ec439d..b78bac2a568439931ec36c19b0e0bfe154996c6b 100644 (file)
  * File contains all the administration image manipulation functions.
  *
  * @package WordPress
+ * @subpackage Administration
  */
 
 /**
- * wp_create_thumbnail() - Create a thumbnail from an Image given a maximum side size.
+ * Crop an Image to a given size.
  *
- * @package WordPress
- * @param      mixed   $file   Filename of the original image, Or attachment id
- * @param      int             $max_side       Maximum length of a single side for the thumbnail
- * @return     string                  Thumbnail path on success, Error string on failure
- *
- * This function can handle most image file formats which PHP supports.
- * If PHP does not have the functionality to save in a file of the same format, the thumbnail will be created as a jpeg.
- */
-function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) {
-       
-       $thumbpath = image_resize( $file, $max_side, $max_side );
-       return apply_filters( 'wp_create_thumbnail', $thumbpath );
-}
-
-/**
- * wp_crop_image() - Crop an Image to a given size.
- *
- * @package WordPress
- * @internal Missing Long Description
- * @param      int     $src_file       The source file
- * @param      int     $src_x          The start x position to crop from
- * @param      int     $src_y          The start y position to crop from
- * @param      int     $src_w          The width to crop
- * @param      int     $src_h          The height to crop
- * @param      int     $dst_w          The destination width
- * @param      int     $dst_h          The destination height
- * @param      int     $src_abs        If the source crop points are absolute
- * @param      int     $dst_file       The destination file to write to
- * @return     string                  New filepath on success, String error message on failure
+ * @since 2.1.0
  *
+ * @param string|int $src The source file or Attachment ID.
+ * @param int $src_x The start x position to crop from.
+ * @param int $src_y The start y position to crop from.
+ * @param int $src_w The width to crop.
+ * @param int $src_h The height to crop.
+ * @param int $dst_w The destination width.
+ * @param int $dst_h The destination height.
+ * @param int $src_abs Optional. If the source crop points are absolute.
+ * @param string $dst_file Optional. The destination file to write to.
+ * @return string|WP_Error New filepath on success, WP_Error on failure.
  */
-function wp_crop_image( $src_file, $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs = false, $dst_file = false ) {
-       if ( is_numeric( $src_file ) ) // Handle int as attachment ID
-               $src_file = get_attached_file( $src_file );
-
-       $src = wp_load_image( $src_file );
-
-       if ( !is_resource( $src ))
-               return $src;
-
-       $dst = imagecreatetruecolor( $dst_w, $dst_h );
-
-       if ( $src_abs ) {
-               $src_w -= $src_x;
-               $src_h -= $src_y;
+function wp_crop_image( $src, $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs = false, $dst_file = false ) {
+       $src_file = $src;
+       if ( is_numeric( $src ) ) { // Handle int as attachment ID
+               $src_file = get_attached_file( $src );
+
+               if ( ! file_exists( $src_file ) ) {
+                       // If the file doesn't exist, attempt a url fopen on the src link.
+                       // This can occur with certain file replication plugins.
+                       $src = _load_image_to_edit_path( $src, 'full' );
+               } else {
+                       $src = $src_file;
+               }
        }
 
-       if (function_exists('imageantialias'))
-               imageantialias( $dst, true );
-
-       imagecopyresampled( $dst, $src, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
+       $editor = wp_get_image_editor( $src );
+       if ( is_wp_error( $editor ) )
+               return $editor;
 
-       imagedestroy( $src ); // Free up memory
+       $src = $editor->crop( $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs );
+       if ( is_wp_error( $src ) )
+               return $src;
 
        if ( ! $dst_file )
                $dst_file = str_replace( basename( $src_file ), 'cropped-' . basename( $src_file ), $src_file );
 
-       $dst_file = preg_replace( '/\\.[^\\.]+$/', '.jpg', $dst_file );
+       /*
+        * The directory containing the original file may no longer exist when
+        * using a replication plugin.
+        */
+       wp_mkdir_p( dirname( $dst_file ) );
 
-       if ( imagejpeg( $dst, $dst_file ) )
-               return $dst_file;
-       else
-               return false;
+       $dst_file = dirname( $dst_file ) . '/' . wp_unique_filename( dirname( $dst_file ), basename( $dst_file ) );
+
+       $result = $editor->save( $dst_file );
+       if ( is_wp_error( $result ) )
+               return $result;
+
+       return $dst_file;
 }
 
 /**
- * wp_generate_attachment_metadata() - Generate post Image attachment Metadata
+ * Generate post thumbnail attachment meta data.
  *
- * @package WordPress
- * @internal Missing Long Description
- * @param      int             $attachment_id  Attachment Id to process
- * @param      string  $file   Filepath of the Attached image
- * @return     mixed                   Metadata for attachment
+ * @since 2.1.0
  *
+ * @param int $attachment_id Attachment Id to process.
+ * @param string $file Filepath of the Attached image.
+ * @return mixed Metadata for attachment.
  */
 function wp_generate_attachment_metadata( $attachment_id, $file ) {
        $attachment = get_post( $attachment_id );
 
        $metadata = array();
+       $support = false;
        if ( preg_match('!^image/!', get_post_mime_type( $attachment )) && file_is_displayable_image($file) ) {
                $imagesize = getimagesize( $file );
                $metadata['width'] = $imagesize[0];
                $metadata['height'] = $imagesize[1];
-               list($uwidth, $uheight) = wp_shrink_dimensions($metadata['width'], $metadata['height']);
-               $metadata['hwstring_small'] = "height='$uheight' width='$uwidth'";
-               $metadata['file'] = $file;
-
-               // make thumbnails and other intermediate sizes
-               $sizes = array('thumbnail', 'medium');
-               $sizes = apply_filters('intermediate_image_sizes', $sizes);
-               
-               foreach ($sizes as $size) {
-                       $resized = image_make_intermediate_size( $file, get_option("{$size}_size_w"), get_option("{$size}_size_h"), get_option("{$size}_crop") );
-                       if ( $resized )
-                               $metadata['sizes'][$size] = $resized;
+
+               // Make the file path relative to the upload dir.
+               $metadata['file'] = _wp_relative_upload_path($file);
+
+               // Make thumbnails and other intermediate sizes.
+               global $_wp_additional_image_sizes;
+
+               $sizes = array();
+               foreach ( get_intermediate_image_sizes() as $s ) {
+                       $sizes[$s] = array( 'width' => '', 'height' => '', 'crop' => false );
+                       if ( isset( $_wp_additional_image_sizes[$s]['width'] ) )
+                               $sizes[$s]['width'] = intval( $_wp_additional_image_sizes[$s]['width'] ); // For theme-added sizes
+                       else
+                               $sizes[$s]['width'] = get_option( "{$s}_size_w" ); // For default sizes set in options
+                       if ( isset( $_wp_additional_image_sizes[$s]['height'] ) )
+                               $sizes[$s]['height'] = intval( $_wp_additional_image_sizes[$s]['height'] ); // For theme-added sizes
+                       else
+                               $sizes[$s]['height'] = get_option( "{$s}_size_h" ); // For default sizes set in options
+                       if ( isset( $_wp_additional_image_sizes[$s]['crop'] ) )
+                               $sizes[$s]['crop'] = $_wp_additional_image_sizes[$s]['crop']; // For theme-added sizes
+                       else
+                               $sizes[$s]['crop'] = get_option( "{$s}_crop" ); // For default sizes set in options
+               }
+
+               /**
+                * Filter the image sizes automatically generated when uploading an image.
+                *
+                * @since 2.9.0
+                *
+                * @param array $sizes An associative array of image sizes.
+                */
+               $sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes );
+
+               if ( $sizes ) {
+                       $editor = wp_get_image_editor( $file );
+
+                       if ( ! is_wp_error( $editor ) )
+                               $metadata['sizes'] = $editor->multi_resize( $sizes );
+               } else {
+                       $metadata['sizes'] = array();
                }
-                       
-               // fetch additional metadata from exif/iptc
+
+               // Fetch additional metadata from EXIF/IPTC.
                $image_meta = wp_read_image_metadata( $file );
-               if ($image_meta)
+               if ( $image_meta )
                        $metadata['image_meta'] = $image_meta;
 
+       } elseif ( preg_match( '#^video/#', get_post_mime_type( $attachment ) ) ) {
+               $metadata = wp_read_video_metadata( $file );
+               $support = current_theme_supports( 'post-thumbnails', 'attachment:video' ) || post_type_supports( 'attachment:video', 'thumbnail' );
+       } elseif ( preg_match( '#^audio/#', get_post_mime_type( $attachment ) ) ) {
+               $metadata = wp_read_audio_metadata( $file );
+               $support = current_theme_supports( 'post-thumbnails', 'attachment:audio' ) || post_type_supports( 'attachment:audio', 'thumbnail' );
        }
-       return apply_filters( 'wp_generate_attachment_metadata', $metadata );
-}
 
-/**
- * wp_load_image() - Load an image which PHP Supports.
- *
- * @package WordPress
- * @internal Missing Long Description
- * @param      string  $file   Filename of the image to load
- * @return     resource                The resulting image resource on success, Error string on failure.
- *
- */
-function wp_load_image( $file ) {
-       if ( is_numeric( $file ) )
-               $file = get_attached_file( $file );
-
-       if ( ! file_exists( $file ) )
-               return sprintf(__("File '%s' doesn't exist?"), $file);
-
-       if ( ! function_exists('imagecreatefromstring') )
-               return __('The GD image library is not installed.');
-
-       // Set artificially high because GD uses uncompressed images in memory
-       @ini_set('memory_limit', '256M');
-       $image = imagecreatefromstring( file_get_contents( $file ) );
-
-       if ( !is_resource( $image ) )
-               return sprintf(__("File '%s' is not an image."), $file);
+       if ( $support && ! empty( $metadata['image']['data'] ) ) {
+               // Check for existing cover.
+               $hash = md5( $metadata['image']['data'] );
+               $posts = get_posts( array(
+                       'fields' => 'ids',
+                       'post_type' => 'attachment',
+                       'post_mime_type' => $metadata['image']['mime'],
+                       'post_status' => 'inherit',
+                       'posts_per_page' => 1,
+                       'meta_key' => '_cover_hash',
+                       'meta_value' => $hash
+               ) );
+               $exists = reset( $posts );
+
+               if ( ! empty( $exists ) ) {
+                       update_post_meta( $attachment_id, '_thumbnail_id', $exists );
+               } else {
+                       $ext = '.jpg';
+                       switch ( $metadata['image']['mime'] ) {
+                       case 'image/gif':
+                               $ext = '.gif';
+                               break;
+                       case 'image/png':
+                               $ext = '.png';
+                               break;
+                       }
+                       $basename = str_replace( '.', '-', basename( $file ) ) . '-image' . $ext;
+                       $uploaded = wp_upload_bits( $basename, '', $metadata['image']['data'] );
+                       if ( false === $uploaded['error'] ) {
+                               $image_attachment = array(
+                                       'post_mime_type' => $metadata['image']['mime'],
+                                       'post_type' => 'attachment',
+                                       'post_content' => '',
+                               );
+                               /**
+                                * Filter the parameters for the attachment thumbnail creation.
+                                *
+                                * @since 3.9.0
+                                *
+                                * @param array $image_attachment An array of parameters to create the thumbnail.
+                                * @param array $metadata         Current attachment metadata.
+                                * @param array $uploaded         An array containing the thumbnail path and url.
+                                */
+                               $image_attachment = apply_filters( 'attachment_thumbnail_args', $image_attachment, $metadata, $uploaded );
+
+                               $sub_attachment_id = wp_insert_attachment( $image_attachment, $uploaded['file'] );
+                               add_post_meta( $sub_attachment_id, '_cover_hash', $hash );
+                               $attach_data = wp_generate_attachment_metadata( $sub_attachment_id, $uploaded['file'] );
+                               wp_update_attachment_metadata( $sub_attachment_id, $attach_data );
+                               update_post_meta( $attachment_id, '_thumbnail_id', $sub_attachment_id );
+                       }
+               }
+       }
 
-       return $image;
+       // Remove the blob of binary data from the array.
+       if ( isset( $metadata['image']['data'] ) )
+               unset( $metadata['image']['data'] );
+
+       /**
+        * Filter the generated attachment meta data.
+        *
+        * @since 2.1.0
+        *
+        * @param array $metadata      An array of attachment meta data.
+        * @param int   $attachment_id Current attachment ID.
+        */
+       return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id );
 }
 
 /**
- * get_udims() - Calculated the new dimentions for downsampled images
+ * Convert a fraction string to a decimal.
  *
- * @package WordPress
- * @internal Missing Description
- * @see wp_shrink_dimensions()
- * @param      int             $width  Current width of the image
- * @param      int     $height Current height of the image
- * @return     mixed                   Array(height,width) of shrunk dimensions.
- *
- */
-function get_udims( $width, $height) {
-       return wp_shrink_dimensions( $width, $height );
-}
-/**
- * wp_shrink_dimensions() - Calculates the new dimentions for a downsampled image.
- *
- * @package WordPress
- * @internal Missing Long Description
- * @param      int             $width  Current width of the image
- * @param      int     $height Current height of the image
- * @param      int             $wmax   Maximum wanted width
- * @param      int             $hmax   Maximum wanted height
- * @return     mixed                   Array(height,width) of shrunk dimensions.
+ * @since 2.5.0
  *
+ * @param string $str
+ * @return int|float
  */
-function wp_shrink_dimensions( $width, $height, $wmax = 128, $hmax = 96 ) {
-       return wp_constrain_dimensions( $width, $height, $wmax, $hmax );
-}
-
-// convert a fraction string to a decimal
 function wp_exif_frac2dec($str) {
        @list( $n, $d ) = explode( '/', $str );
        if ( !empty($d) )
@@ -181,25 +219,49 @@ function wp_exif_frac2dec($str) {
        return $str;
 }
 
-// convert the exif date format to a unix timestamp
+/**
+ * Convert the exif date format to a unix timestamp.
+ *
+ * @since 2.5.0
+ *
+ * @param string $str
+ * @return int
+ */
 function wp_exif_date2ts($str) {
-       // seriously, who formats a date like 'YYYY:MM:DD hh:mm:ss'?
        @list( $date, $time ) = explode( ' ', trim($str) );
        @list( $y, $m, $d ) = explode( ':', $date );
 
        return strtotime( "{$y}-{$m}-{$d} {$time}" );
 }
 
-// get extended image metadata, exif or iptc as available
+/**
+ * Get extended image metadata, exif or iptc as available.
+ *
+ * Retrieves the EXIF metadata aperture, credit, camera, caption, copyright, iso
+ * created_timestamp, focal_length, shutter_speed, and title.
+ *
+ * The IPTC metadata that is retrieved is APP13, credit, byline, created date
+ * and time, caption, copyright, and title. Also includes FNumber, Model,
+ * DateTimeDigitized, FocalLength, ISOSpeedRatings, and ExposureTime.
+ *
+ * @todo Try other exif libraries if available.
+ * @since 2.5.0
+ *
+ * @param string $file
+ * @return bool|array False on failure. Image metadata array on success.
+ */
 function wp_read_image_metadata( $file ) {
-       if ( !file_exists( $file ) )
+       if ( ! file_exists( $file ) )
                return false;
 
-       list(,,$sourceImageType) = getimagesize( $file );
+       list( , , $sourceImageType ) = getimagesize( $file );
 
-       // exif contains a bunch of data we'll probably never need formatted in ways that are difficult to use.
-       // We'll normalize it and just extract the fields that are likely to be useful.  Fractions and numbers
-       // are converted to floats, dates to unix timestamps, and everything else to strings.
+       /*
+        * EXIF contains a bunch of data we'll probably never need formatted in ways
+        * that are difficult to use. We'll normalize it and just extract the fields
+        * that are likely to be useful. Fractions and numbers are converted to
+        * floats, dates to unix timestamps, and everything else to strings.
+        */
        $meta = array(
                'aperture' => 0,
                'credit' => '',
@@ -211,72 +273,326 @@ function wp_read_image_metadata( $file ) {
                'iso' => 0,
                'shutter_speed' => 0,
                'title' => '',
+               'orientation' => 0,
        );
 
-       // read iptc first, since it might contain data not available in exif such as caption, description etc
-       if ( is_callable('iptcparse') ) {
-               getimagesize($file, $info);
-               if ( !empty($info['APP13']) ) {
-                       $iptc = iptcparse($info['APP13']);
-                       if ( !empty($iptc['2#110'][0]) ) // credit
-                               $meta['credit'] = utf8_encode(trim($iptc['2#110'][0]));
-                       elseif ( !empty($iptc['2#080'][0]) ) // byline
-                               $meta['credit'] = utf8_encode(trim($iptc['2#080'][0]));
-                       if ( !empty($iptc['2#055'][0]) and !empty($iptc['2#060'][0]) ) // created datee and time
-                               $meta['created_timestamp'] = strtotime($iptc['2#055'][0] . ' ' . $iptc['2#060'][0]);
-                       if ( !empty($iptc['2#120'][0]) ) // caption
-                               $meta['caption'] = utf8_encode(trim($iptc['2#120'][0]));
-                       if ( !empty($iptc['2#116'][0]) ) // copyright
-                               $meta['copyright'] = utf8_encode(trim($iptc['2#116'][0]));
-                       if ( !empty($iptc['2#005'][0]) ) // title
-                               $meta['title'] = utf8_encode(trim($iptc['2#005'][0]));
+       /*
+        * Read IPTC first, since it might contain data not available in exif such
+        * as caption, description etc.
+        */
+       if ( is_callable( 'iptcparse' ) ) {
+               getimagesize( $file, $info );
+
+               if ( ! empty( $info['APP13'] ) ) {
+                       $iptc = iptcparse( $info['APP13'] );
+
+                       // Headline, "A brief synopsis of the caption."
+                       if ( ! empty( $iptc['2#105'][0] ) ) {
+                               $meta['title'] = trim( $iptc['2#105'][0] );
+                       /*
+                        * Title, "Many use the Title field to store the filename of the image,
+                        * though the field may be used in many ways."
+                        */
+                       } elseif ( ! empty( $iptc['2#005'][0] ) ) {
+                               $meta['title'] = trim( $iptc['2#005'][0] );
+                       }
+
+                       if ( ! empty( $iptc['2#120'][0] ) ) { // description / legacy caption
+                               $caption = trim( $iptc['2#120'][0] );
+                               if ( empty( $meta['title'] ) ) {
+                                       mbstring_binary_safe_encoding();
+                                       $caption_length = strlen( $caption );
+                                       reset_mbstring_encoding();
+
+                                       // Assume the title is stored in 2:120 if it's short.
+                                       if ( $caption_length < 80 ) {
+                                               $meta['title'] = $caption;
+                                       } else {
+                                               $meta['caption'] = $caption;
+                                       }
+                               } elseif ( $caption != $meta['title'] ) {
+                                       $meta['caption'] = $caption;
+                               }
+                       }
+
+                       if ( ! empty( $iptc['2#110'][0] ) ) // credit
+                               $meta['credit'] = trim( $iptc['2#110'][0] );
+                       elseif ( ! empty( $iptc['2#080'][0] ) ) // creator / legacy byline
+                               $meta['credit'] = trim( $iptc['2#080'][0] );
+
+                       if ( ! empty( $iptc['2#055'][0] ) and ! empty( $iptc['2#060'][0] ) ) // created date and time
+                               $meta['created_timestamp'] = strtotime( $iptc['2#055'][0] . ' ' . $iptc['2#060'][0] );
+
+                       if ( ! empty( $iptc['2#116'][0] ) ) // copyright
+                               $meta['copyright'] = trim( $iptc['2#116'][0] );
                 }
        }
 
-       // fetch additional info from exif if available
-       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)) ) ) {
+       /**
+        * Filter the image types to check for exif data.
+        *
+        * @since 2.5.0
+        *
+        * @param array $image_types Image types to check for exif data.
+        */
+       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 ) ) ) ) {
                $exif = @exif_read_data( $file );
-               if (!empty($exif['FNumber']))
+
+               if ( empty( $meta['title'] ) && ! empty( $exif['Title'] ) ) {
+                       $meta['title'] = trim( $exif['Title'] );
+               }
+
+               if ( ! empty( $exif['ImageDescription'] ) ) {
+                       mbstring_binary_safe_encoding();
+                       $description_length = strlen( $exif['ImageDescription'] );
+                       reset_mbstring_encoding();
+
+                       if ( empty( $meta['title'] ) && $description_length < 80 ) {
+                               // Assume the title is stored in ImageDescription
+                               $meta['title'] = trim( $exif['ImageDescription'] );
+                               if ( empty( $meta['caption'] ) && ! empty( $exif['COMPUTED']['UserComment'] ) && trim( $exif['COMPUTED']['UserComment'] ) != $meta['title'] ) {
+                                       $meta['caption'] = trim( $exif['COMPUTED']['UserComment'] );
+                               }
+                       } elseif ( empty( $meta['caption'] ) && trim( $exif['ImageDescription'] ) != $meta['title'] ) {
+                               $meta['caption'] = trim( $exif['ImageDescription'] );
+                       }
+               } elseif ( empty( $meta['caption'] ) && ! empty( $exif['Comments'] ) && trim( $exif['Comments'] ) != $meta['title'] ) {
+                       $meta['caption'] = trim( $exif['Comments'] );
+               }
+
+               if ( empty( $meta['credit'] ) ) {
+                       if ( ! empty( $exif['Artist'] ) ) {
+                               $meta['credit'] = trim( $exif['Artist'] );
+                       } elseif ( ! empty($exif['Author'] ) ) {
+                               $meta['credit'] = trim( $exif['Author'] );
+                       }
+               }
+
+               if ( empty( $meta['copyright'] ) && ! empty( $exif['Copyright'] ) ) {
+                       $meta['copyright'] = trim( $exif['Copyright'] );
+               }
+               if ( ! empty( $exif['FNumber'] ) ) {
                        $meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 );
-               if (!empty($exif['Model']))
+               }
+               if ( ! empty( $exif['Model'] ) ) {
                        $meta['camera'] = trim( $exif['Model'] );
-               if (!empty($exif['DateTimeDigitized']))
-                       $meta['created_timestamp'] = wp_exif_date2ts($exif['DateTimeDigitized']);
-               if (!empty($exif['FocalLength']))
-                       $meta['focal_length'] = wp_exif_frac2dec( $exif['FocalLength'] );
-               if (!empty($exif['ISOSpeedRatings']))
-                       $meta['iso'] = $exif['ISOSpeedRatings'];
-               if (!empty($exif['ExposureTime']))
-                       $meta['shutter_speed'] = wp_exif_frac2dec( $exif['ExposureTime'] );
+               }
+               if ( empty( $meta['created_timestamp'] ) && ! empty( $exif['DateTimeDigitized'] ) ) {
+                       $meta['created_timestamp'] = wp_exif_date2ts( $exif['DateTimeDigitized'] );
+               }
+               if ( ! empty( $exif['FocalLength'] ) ) {
+                       $meta['focal_length'] = (string) wp_exif_frac2dec( $exif['FocalLength'] );
+               }
+               if ( ! empty( $exif['ISOSpeedRatings'] ) ) {
+                       $meta['iso'] = is_array( $exif['ISOSpeedRatings'] ) ? reset( $exif['ISOSpeedRatings'] ) : $exif['ISOSpeedRatings'];
+                       $meta['iso'] = trim( $meta['iso'] );
+               }
+               if ( ! empty( $exif['ExposureTime'] ) ) {
+                       $meta['shutter_speed'] = (string) wp_exif_frac2dec( $exif['ExposureTime'] );
+               }
+               if ( ! empty( $exif['Orientation'] ) ) {
+                       $meta['orientation'] = $exif['Orientation'];
+               }
+       }
+
+       foreach ( array( 'title', 'caption', 'credit', 'copyright', 'camera', 'iso' ) as $key ) {
+               if ( $meta[ $key ] && ! seems_utf8( $meta[ $key ] ) ) {
+                       $meta[ $key ] = utf8_encode( $meta[ $key ] );
+               }
        }
-       // FIXME: try other exif libraries if available
 
+       /**
+        * Filter the array of meta data read from an image's exif data.
+        *
+        * @since 2.5.0
+        *
+        * @param array  $meta            Image meta data.
+        * @param string $file            Path to image file.
+        * @param int    $sourceImageType Type of image.
+        */
        return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType );
 
 }
 
-// is the file a real image file?
+/**
+ * Validate that file is an image.
+ *
+ * @since 2.5.0
+ *
+ * @param string $path File path to test if valid image.
+ * @return bool True if valid image, false if not valid image.
+ */
 function file_is_valid_image($path) {
        $size = @getimagesize($path);
        return !empty($size);
 }
 
-// is the file an image suitable for displaying within a web page?
+/**
+ * Validate that file is suitable for displaying within a web page.
+ *
+ * @since 2.5.0
+ *
+ * @param string $path File path to test.
+ * @return bool True if suitable, false if not suitable.
+ */
 function file_is_displayable_image($path) {
-       $info = @getimagesize($path);
-       if ( empty($info) )
-               $result = false;
-       elseif ( !in_array($info[2], array(IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG)) )
-               // only gif, jpeg and png images can reliably be displayed
+       $displayable_image_types = array( IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_BMP );
+
+       $info = @getimagesize( $path );
+       if ( empty( $info ) ) {
                $result = false;
-       elseif ( $info['channels'] > 0 && $info['channels'] != 3 ) {
-               // some web browsers can't display cmyk or grayscale jpegs
+       } elseif ( ! in_array( $info[2], $displayable_image_types ) ) {
                $result = false;
-       }
-       else
+       } else {
                $result = true;
-               
-       return apply_filters('file_is_displayable_image', $result, $path);
+       }
+
+       /**
+        * Filter whether the current image is displayable in the browser.
+        *
+        * @since 2.5.0
+        *
+        * @param bool   $result Whether the image can be displayed. Default true.
+        * @param string $path   Path to the image.
+        */
+       return apply_filters( 'file_is_displayable_image', $result, $path );
 }
 
-?>
+/**
+ * Load an image resource for editing.
+ *
+ * @since 2.9.0
+ *
+ * @param string $attachment_id Attachment ID.
+ * @param string $mime_type Image mime type.
+ * @param string $size Optional. Image size, defaults to 'full'.
+ * @return resource|false The resulting image resource on success, false on failure.
+ */
+function load_image_to_edit( $attachment_id, $mime_type, $size = 'full' ) {
+       $filepath = _load_image_to_edit_path( $attachment_id, $size );
+       if ( empty( $filepath ) )
+               return false;
+
+       switch ( $mime_type ) {
+               case 'image/jpeg':
+                       $image = imagecreatefromjpeg($filepath);
+                       break;
+               case 'image/png':
+                       $image = imagecreatefrompng($filepath);
+                       break;
+               case 'image/gif':
+                       $image = imagecreatefromgif($filepath);
+                       break;
+               default:
+                       $image = false;
+                       break;
+       }
+       if ( is_resource($image) ) {
+               /**
+                * Filter the current image being loaded for editing.
+                *
+                * @since 2.9.0
+                *
+                * @param resource $image         Current image.
+                * @param string   $attachment_id Attachment ID.
+                * @param string   $size          Image size.
+                */
+               $image = apply_filters( 'load_image_to_edit', $image, $attachment_id, $size );
+               if ( function_exists('imagealphablending') && function_exists('imagesavealpha') ) {
+                       imagealphablending($image, false);
+                       imagesavealpha($image, true);
+               }
+       }
+       return $image;
+}
+
+/**
+ * Retrieve the path or url of an attachment's attached file.
+ *
+ * If the attached file is not present on the local filesystem (usually due to replication plugins),
+ * then the url of the file is returned if url fopen is supported.
+ *
+ * @since 3.4.0
+ * @access private
+ *
+ * @param string $attachment_id Attachment ID.
+ * @param string $size Optional. Image size, defaults to 'full'.
+ * @return string|false File path or url on success, false on failure.
+ */
+function _load_image_to_edit_path( $attachment_id, $size = 'full' ) {
+       $filepath = get_attached_file( $attachment_id );
+
+       if ( $filepath && file_exists( $filepath ) ) {
+               if ( 'full' != $size && ( $data = image_get_intermediate_size( $attachment_id, $size ) ) ) {
+                       /**
+                        * Filter the path to the current image.
+                        *
+                        * The filter is evaluated for all image sizes except 'full'.
+                        *
+                        * @since 3.1.0
+                        *
+                        * @param string $path          Path to the current image.
+                        * @param string $attachment_id Attachment ID.
+                        * @param string $size          Size of the image.
+                        */
+                       $filepath = apply_filters( 'load_image_to_edit_filesystempath', path_join( dirname( $filepath ), $data['file'] ), $attachment_id, $size );
+               }
+       } elseif ( function_exists( 'fopen' ) && function_exists( 'ini_get' ) && true == ini_get( 'allow_url_fopen' ) ) {
+               /**
+                * Filter the image URL if not in the local filesystem.
+                *
+                * The filter is only evaluated if fopen is enabled on the server.
+                *
+                * @since 3.1.0
+                *
+                * @param string $image_url     Current image URL.
+                * @param string $attachment_id Attachment ID.
+                * @param string $size          Size of the image.
+                */
+               $filepath = apply_filters( 'load_image_to_edit_attachmenturl', wp_get_attachment_url( $attachment_id ), $attachment_id, $size );
+       }
+
+       /**
+        * Filter the returned path or URL of the current image.
+        *
+        * @since 2.9.0
+        *
+        * @param string|bool $filepath      File path or URL to current image, or false.
+        * @param string      $attachment_id Attachment ID.
+        * @param string      $size          Size of the image.
+        */
+       return apply_filters( 'load_image_to_edit_path', $filepath, $attachment_id, $size );
+}
+
+/**
+ * Copy an existing image file.
+ *
+ * @since 3.4.0
+ * @access private
+ *
+ * @param string $attachment_id Attachment ID.
+ * @return string|false New file path on success, false on failure.
+ */
+function _copy_image_file( $attachment_id ) {
+       $dst_file = $src_file = get_attached_file( $attachment_id );
+       if ( ! file_exists( $src_file ) )
+               $src_file = _load_image_to_edit_path( $attachment_id );
+
+       if ( $src_file ) {
+               $dst_file = str_replace( basename( $dst_file ), 'copy-' . basename( $dst_file ), $dst_file );
+               $dst_file = dirname( $dst_file ) . '/' . wp_unique_filename( dirname( $dst_file ), basename( $dst_file ) );
+
+               /*
+                * The directory containing the original file may no longer
+                * exist when using a replication plugin.
+                */
+               wp_mkdir_p( dirname( $dst_file ) );
+
+               if ( ! @copy( $src_file, $dst_file ) )
+                       $dst_file = false;
+       } else {
+               $dst_file = false;
+       }
+
+       return $dst_file;
+}