WordPress 4.4
[autoinstalls/wordpress.git] / wp-admin / includes / image.php
index ec4466e5dcb40a96f7c776ff1e4381c2eacd8d46..139d40507052d31a7c9239ec626efd97f3478635 100644 (file)
 <?php
+/**
+ * File contains all the administration image manipulation functions.
+ *
+ * @package WordPress
+ * @subpackage Administration
+ */
+
+/**
+ * Crop an Image to a given size.
+ *
+ * @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, $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;
+               }
+       }
 
-function get_udims( $width, $height) {
-       if ( $height <= 96 && $width <= 128 )
-               return array( $width, $height);
-       elseif ( $width / $height > 4 / 3 )
-               return array( 128, (int) ($height / $width * 128 ));
-       else
-               return array( (int) ($width / $height * 96 ), 96 );
-}
+       $editor = wp_get_image_editor( $src );
+       if ( is_wp_error( $editor ) )
+               return $editor;
 
-function wp_create_thumbnail( $file, $max_side, $effect = '' ) {
+       $src = $editor->crop( $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs );
+       if ( is_wp_error( $src ) )
+               return $src;
 
-               // 1 = GIF, 2 = JPEG, 3 = PNG
+       if ( ! $dst_file )
+               $dst_file = str_replace( basename( $src_file ), 'cropped-' . basename( $src_file ), $src_file );
 
-       if ( file_exists( $file ) ) {
-               $type = getimagesize( $file );
+       /*
+        * The directory containing the original file may no longer exist when
+        * using a replication plugin.
+        */
+       wp_mkdir_p( dirname( $dst_file ) );
 
-               // if the associated function doesn't exist - then it's not
-               // handle. duh. i hope.
+       $dst_file = dirname( $dst_file ) . '/' . wp_unique_filename( dirname( $dst_file ), basename( $dst_file ) );
 
-               if (!function_exists( 'imagegif' ) && $type[2] == 1 ) {
-                       $error = __( 'Filetype not supported. Thumbnail not created.' );
-               }
-               elseif (!function_exists( 'imagejpeg' ) && $type[2] == 2 ) {
-                       $error = __( 'Filetype not supported. Thumbnail not created.' );
+       $result = $editor->save( $dst_file );
+       if ( is_wp_error( $result ) )
+               return $result;
+
+       return $dst_file;
+}
+
+/**
+ * Generate post thumbnail attachment meta data.
+ *
+ * @since 2.1.0
+ *
+ * @global array $_wp_additional_image_sizes
+ *
+ * @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];
+
+               // 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
                }
-               elseif (!function_exists( 'imagepng' ) && $type[2] == 3 ) {
-                       $error = __( 'Filetype not supported. Thumbnail not created.' );
+
+               /**
+                * Filter the image sizes automatically generated when uploading an image.
+                *
+                * @since 2.9.0
+                * @since 4.4.0 The `$metadata` argument was addeed
+                *
+                * @param array $sizes    An associative array of image sizes.
+                * @param array $metadata An associative array of image metadata: width, height, file.
+                */
+               $sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes, $metadata );
+
+               if ( $sizes ) {
+                       $editor = wp_get_image_editor( $file );
+
+                       if ( ! is_wp_error( $editor ) )
+                               $metadata['sizes'] = $editor->multi_resize( $sizes );
                } else {
+                       $metadata['sizes'] = array();
+               }
 
-                       // create the initial copy from the original file
-                       if ( $type[2] == 1 ) {
-                               $image = imagecreatefromgif( $file );
-                       }
-                       elseif ( $type[2] == 2 ) {
-                               $image = imagecreatefromjpeg( $file );
+               // Fetch additional metadata from EXIF/IPTC.
+               $image_meta = wp_read_image_metadata( $file );
+               if ( $image_meta )
+                       $metadata['image_meta'] = $image_meta;
+
+       } elseif ( wp_attachment_is( 'video', $attachment ) ) {
+               $metadata = wp_read_video_metadata( $file );
+               $support = current_theme_supports( 'post-thumbnails', 'attachment:video' ) || post_type_supports( 'attachment:video', 'thumbnail' );
+       } elseif ( wp_attachment_is( 'audio', $attachment ) ) {
+               $metadata = wp_read_audio_metadata( $file );
+               $support = current_theme_supports( 'post-thumbnails', 'attachment:audio' ) || post_type_supports( 'attachment:audio', 'thumbnail' );
+       }
+
+       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;
                        }
-                       elseif ( $type[2] == 3 ) {
-                               $image = imagecreatefrompng( $file );
+                       $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 );
                        }
+               }
+       }
 
-                       if ( function_exists( 'imageantialias' ))
-                               imageantialias( $image, TRUE );
+       // Remove the blob of binary data from the array.
+       if ( $metadata ) {
+               unset( $metadata['image']['data'] );
+       }
 
-                       $image_attr = getimagesize( $file );
+       /**
+        * 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 );
+}
 
-                       // figure out the longest side
+/**
+ * Convert a fraction string to a decimal.
+ *
+ * @since 2.5.0
+ *
+ * @param string $str
+ * @return int|float
+ */
+function wp_exif_frac2dec($str) {
+       @list( $n, $d ) = explode( '/', $str );
+       if ( !empty($d) )
+               return $n / $d;
+       return $str;
+}
 
-                       if ( $image_attr[0] > $image_attr[1] ) {
-                               $image_width = $image_attr[0];
-                               $image_height = $image_attr[1];
-                               $image_new_width = $max_side;
+/**
+ * Convert the exif date format to a unix timestamp.
+ *
+ * @since 2.5.0
+ *
+ * @param string $str
+ * @return int
+ */
+function wp_exif_date2ts($str) {
+       @list( $date, $time ) = explode( ' ', trim($str) );
+       @list( $y, $m, $d ) = explode( ':', $date );
+
+       return strtotime( "{$y}-{$m}-{$d} {$time}" );
+}
 
-                               $image_ratio = $image_width / $image_new_width;
-                               $image_new_height = $image_height / $image_ratio;
-                               //width is > height
-                       } else {
-                               $image_width = $image_attr[0];
-                               $image_height = $image_attr[1];
-                               $image_new_height = $max_side;
+/**
+ * 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 ) )
+               return false;
 
-                               $image_ratio = $image_height / $image_new_height;
-                               $image_new_width = $image_width / $image_ratio;
-                               //height > width
+       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.
+        */
+       $meta = array(
+               'aperture' => 0,
+               'credit' => '',
+               'camera' => '',
+               'caption' => '',
+               'created_timestamp' => 0,
+               'copyright' => '',
+               'focal_length' => 0,
+               'iso' => 0,
+               'shutter_speed' => 0,
+               'title' => '',
+               'orientation' => 0,
+               'keywords' => array(),
+       );
+
+       $iptc = array();
+       /*
+        * 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] );
                        }
 
-                       $thumbnail = imagecreatetruecolor( $image_new_width, $image_new_height);
-                       @ imagecopyresampled( $thumbnail, $image, 0, 0, 0, 0, $image_new_width, $image_new_height, $image_attr[0], $image_attr[1] );
-
-                       // If no filters change the filename, we'll do a default transformation.
-                       if ( basename( $file ) == $thumb = apply_filters( 'thumbnail_filename', basename( $file ) ) )
-                               $thumb = preg_replace( '!(\.[^.]+)?$!', '.thumbnail' . '$1', basename( $file ), 1 );
+                       if ( ! empty( $iptc['2#120'][0] ) ) { // description / legacy caption
+                               $caption = trim( $iptc['2#120'][0] );
 
-                       $thumbpath = str_replace( basename( $file ), $thumb, $file );
+                               mbstring_binary_safe_encoding();
+                               $caption_length = strlen( $caption );
+                               reset_mbstring_encoding();
 
-                       // move the thumbnail to its final destination
-                       if ( $type[2] == 1 ) {
-                               if (!imagegif( $thumbnail, $thumbpath ) ) {
-                                       $error = __( "Thumbnail path invalid" );
-                               }
-                       }
-                       elseif ( $type[2] == 2 ) {
-                               if (!imagejpeg( $thumbnail, $thumbpath ) ) {
-                                       $error = __( "Thumbnail path invalid" );
-                               }
-                       }
-                       elseif ( $type[2] == 3 ) {
-                               if (!imagepng( $thumbnail, $thumbpath ) ) {
-                                       $error = __( "Thumbnail path invalid" );
+                               if ( empty( $meta['title'] ) && $caption_length < 80 ) {
+                                       // Assume the title is stored in 2:120 if it's short.
+                                       $meta['title'] = $caption;
                                }
+
+                               $meta['caption'] = $caption;
                        }
 
-               }
-       } else {
-               $error = __( 'File not found' );
-       }
+                       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 ( $error ) ) {
-               return $error;
-       } else {
-               return apply_filters( 'wp_create_thumbnail', $thumbpath );
+                       if ( ! empty( $iptc['2#055'][0] ) && ! 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] );
+
+                       if ( ! empty( $iptc['2#025'][0] ) ) { // keywords array
+                               $meta['keywords'] = array_values( $iptc['2#025'] );
+                       }
+                }
        }
-}
 
-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 ( ctype_digit( $src_file ) ) // Handle int as attachment ID
-               $src_file = get_attached_file( $src_file );
+       /**
+        * 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['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'] );
+                       }
 
-       $src = wp_load_image( $src_file );
+                       if ( empty( $meta['caption'] ) && ! empty( $exif['COMPUTED']['UserComment'] ) ) {
+                               $meta['caption'] = trim( $exif['COMPUTED']['UserComment'] );
+                       }
 
-       if ( !is_resource( $src ))
-               return $src;
+                       if ( empty( $meta['caption'] ) ) {
+                               $meta['caption'] = trim( $exif['ImageDescription'] );
+                       }
+               } elseif ( empty( $meta['caption'] ) && ! empty( $exif['Comments'] ) ) {
+                       $meta['caption'] = trim( $exif['Comments'] );
+               }
 
-       $dst = imagecreatetruecolor( $dst_w, $dst_h );
+               if ( empty( $meta['credit'] ) ) {
+                       if ( ! empty( $exif['Artist'] ) ) {
+                               $meta['credit'] = trim( $exif['Artist'] );
+                       } elseif ( ! empty($exif['Author'] ) ) {
+                               $meta['credit'] = trim( $exif['Author'] );
+                       }
+               }
 
-       if ( $src_abs ) {
-               $src_w -= $src_x;
-               $src_h -= $src_y;
+               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'] ) ) {
+                       $meta['camera'] = trim( $exif['Model'] );
+               }
+               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'];
+               }
        }
 
-       if (function_exists('imageantialias'))
-               imageantialias( $dst, true );
-
-       imagecopyresampled( $dst, $src, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
+       foreach ( array( 'title', 'caption', 'credit', 'copyright', 'camera', 'iso' ) as $key ) {
+               if ( $meta[ $key ] && ! seems_utf8( $meta[ $key ] ) ) {
+                       $meta[ $key ] = utf8_encode( $meta[ $key ] );
+               }
+       }
 
-       if ( !$dst_file )
-               $dst_file = str_replace( basename( $src_file ), 'cropped-'.basename( $src_file ), $src_file );
+       foreach ( $meta as &$value ) {
+               if ( is_string( $value ) ) {
+                       $value = wp_kses_post( $value );
+               }
+       }
 
-       $dst_file = preg_replace( '/\\.[^\\.]+$/', '.jpg', $dst_file );
+       /**
+        * Filter the array of meta data read from an image's exif data.
+        *
+        * @since 2.5.0
+        * @since 4.4.0 The `$iptc` parameter was added.
+        *
+        * @param array  $meta            Image meta data.
+        * @param string $file            Path to image file.
+        * @param int    $sourceImageType Type of image.
+        * @param array  $iptc            IPTC data.
+        */
+       return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType, $iptc );
 
-       if ( imagejpeg( $dst, $dst_file ) )
-               return $dst_file;
-       else
-               return false;
 }
 
-function wp_generate_attachment_metadata( $attachment_id, $file ) {
-       $attachment = get_post( $attachment_id );
+/**
+ * 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);
+}
 
-       $metadata = array();
-       if ( preg_match('!^image/!', get_post_mime_type( $attachment )) ) {
-               $imagesize = getimagesize($file);
-               $metadata['width'] = $imagesize['0'];
-               $metadata['height'] = $imagesize['1'];
-               list($uwidth, $uheight) = get_udims($metadata['width'], $metadata['height']);
-               $metadata['hwstring_small'] = "height='$uheight' width='$uwidth'";
-               $metadata['file'] = $file;
+/**
+ * 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) {
+       $displayable_image_types = array( IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_BMP );
+
+       $info = @getimagesize( $path );
+       if ( empty( $info ) ) {
+               $result = false;
+       } elseif ( ! in_array( $info[2], $displayable_image_types ) ) {
+               $result = false;
+       } else {
+               $result = true;
+       }
 
-               $max = apply_filters( 'wp_thumbnail_creation_size_limit', 3 * 1024 * 1024, $attachment_id, $file );
+       /**
+        * 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 );
+}
 
-               if ( $max < 0 || $metadata['width'] * $metadata['height'] < $max ) {
-                       $max_side = apply_filters( 'wp_thumbnail_max_side_length', 128, $attachment_id, $file );
-                       $thumb = wp_create_thumbnail( $file, $max_side );
+/**
+ * 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;
 
-                       if ( @file_exists($thumb) )
-                               $metadata['thumb'] = basename($thumb);
+       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 apply_filters( 'wp_generate_attachment_metadata', $metadata );
+       return $image;
 }
 
-function wp_load_image( $file ) {
-       if ( ctype_digit( $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.');
-
-       $contents = file_get_contents( $file );
-
-       $image = imagecreatefromstring( $contents );
-
-       if ( !is_resource( $image ) )
-               return sprintf(__("File '%s' is not an image."), $file);
+/**
+ * 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 );
+       }
 
-       return $image;
+       /**
+        * 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 );
 }
 
-function wp_shrink_dimensions( $width, $height, $wmax = 128, $hmax = 96 ) {
-       if ( $height <= $hmax && $width <= $wmax )
-               return array( $width, $height);
-       elseif ( $width / $height > $wmax / $hmax )
-               return array( $wmax, (int) ($height / $width * $wmax ));
-       else
-               return array( (int) ($width / $height * $hmax ), $hmax );
-}
+/**
+ * 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;
+}