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  • trunk/wp-admin/includes/image.php

    r5700 r7549  
    11<?php
    2 
    3 function get_udims( $width, $height) {
    4     if ( $height <= 96 && $width <= 128 )
    5         return array( $width, $height);
    6     elseif ( $width / $height > 4 / 3 )
    7         return array( 128, (int) ($height / $width * 128 ));
    8     else
    9         return array( (int) ($width / $height * 96 ), 96 );
    10 }
    11 
    12 function wp_create_thumbnail( $file, $max_side, $effect = '' ) {
    13 
    14         // 1 = GIF, 2 = JPEG, 3 = PNG
    15 
    16     if ( file_exists( $file ) ) {
    17         $type = getimagesize( $file );
    18 
    19         // if the associated function doesn't exist - then it's not
    20         // handle. duh. i hope.
    21 
    22         if (!function_exists( 'imagegif' ) && $type[2] == 1 ) {
    23             $error = __( 'Filetype not supported. Thumbnail not created.' );
    24         }
    25         elseif (!function_exists( 'imagejpeg' ) && $type[2] == 2 ) {
    26             $error = __( 'Filetype not supported. Thumbnail not created.' );
    27         }
    28         elseif (!function_exists( 'imagepng' ) && $type[2] == 3 ) {
    29             $error = __( 'Filetype not supported. Thumbnail not created.' );
    30         } else {
    31 
    32             // create the initial copy from the original file
    33             if ( $type[2] == 1 ) {
    34                 $image = imagecreatefromgif( $file );
    35             }
    36             elseif ( $type[2] == 2 ) {
    37                 $image = imagecreatefromjpeg( $file );
    38             }
    39             elseif ( $type[2] == 3 ) {
    40                 $image = imagecreatefrompng( $file );
    41             }
    42 
    43             if ( function_exists( 'imageantialias' ))
    44                 imageantialias( $image, TRUE );
    45 
    46             $image_attr = getimagesize( $file );
    47 
    48             // figure out the longest side
    49 
    50             if ( $image_attr[0] > $image_attr[1] ) {
    51                 $image_width = $image_attr[0];
    52                 $image_height = $image_attr[1];
    53                 $image_new_width = $max_side;
    54 
    55                 $image_ratio = $image_width / $image_new_width;
    56                 $image_new_height = $image_height / $image_ratio;
    57                 //width is > height
    58             } else {
    59                 $image_width = $image_attr[0];
    60                 $image_height = $image_attr[1];
    61                 $image_new_height = $max_side;
    62 
    63                 $image_ratio = $image_height / $image_new_height;
    64                 $image_new_width = $image_width / $image_ratio;
    65                 //height > width
    66             }
    67 
    68             $thumbnail = imagecreatetruecolor( $image_new_width, $image_new_height);
    69             @ imagecopyresampled( $thumbnail, $image, 0, 0, 0, 0, $image_new_width, $image_new_height, $image_attr[0], $image_attr[1] );
    70 
    71             // If no filters change the filename, we'll do a default transformation.
    72             if ( basename( $file ) == $thumb = apply_filters( 'thumbnail_filename', basename( $file ) ) )
    73                 $thumb = preg_replace( '!(\.[^.]+)?$!', '.thumbnail' . '$1', basename( $file ), 1 );
    74 
    75             $thumbpath = str_replace( basename( $file ), $thumb, $file );
    76 
    77             // move the thumbnail to its final destination
    78             if ( $type[2] == 1 ) {
    79                 if (!imagegif( $thumbnail, $thumbpath ) ) {
    80                     $error = __( "Thumbnail path invalid" );
    81                 }
    82             }
    83             elseif ( $type[2] == 2 ) {
    84                 if (!imagejpeg( $thumbnail, $thumbpath ) ) {
    85                     $error = __( "Thumbnail path invalid" );
    86                 }
    87             }
    88             elseif ( $type[2] == 3 ) {
    89                 if (!imagepng( $thumbnail, $thumbpath ) ) {
    90                     $error = __( "Thumbnail path invalid" );
    91                 }
    92             }
    93 
    94         }
    95     } else {
    96         $error = __( 'File not found' );
    97     }
    98 
    99     if (!empty ( $error ) ) {
    100         return $error;
    101     } else {
    102         return apply_filters( 'wp_create_thumbnail', $thumbpath );
    103     }
    104 }
    105 
     2/**
     3 * File contains all the administration image manipulation functions.
     4 *
     5 * @package WordPress
     6 */
     7
     8/**
     9 * wp_create_thumbnail() - Create a thumbnail from an Image given a maximum side size.
     10 *
     11 * @package WordPress
     12 * @param   mixed   $file   Filename of the original image, Or attachment id
     13 * @param   int     $max_side   Maximum length of a single side for the thumbnail
     14 * @return  string          Thumbnail path on success, Error string on failure
     15 *
     16 * This function can handle most image file formats which PHP supports.
     17 * If PHP does not have the functionality to save in a file of the same format, the thumbnail will be created as a jpeg.
     18 */
     19function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) {
     20   
     21    $thumbpath = image_resize( $file, $max_side, $max_side );
     22    return apply_filters( 'wp_create_thumbnail', $thumbpath );
     23}
     24
     25/**
     26 * wp_crop_image() - Crop an Image to a given size.
     27 *
     28 * @package WordPress
     29 * @internal Missing Long Description
     30 * @param   int $src_file   The source file
     31 * @param   int $src_x      The start x position to crop from
     32 * @param   int $src_y      The start y position to crop from
     33 * @param   int $src_w      The width to crop
     34 * @param   int $src_h      The height to crop
     35 * @param   int $dst_w      The destination width
     36 * @param   int $dst_h      The destination height
     37 * @param   int $src_abs    If the source crop points are absolute
     38 * @param   int $dst_file   The destination file to write to
     39 * @return  string          New filepath on success, String error message on failure
     40 *
     41 */
    10642function wp_crop_image( $src_file, $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs = false, $dst_file = false ) {
    107     if ( ctype_digit( $src_file ) ) // Handle int as attachment ID
     43    if ( is_numeric( $src_file ) ) // Handle int as attachment ID
    10844        $src_file = get_attached_file( $src_file );
    10945
    … …  
    12561    imagecopyresampled( $dst, $src, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
    12662
    127     if ( !$dst_file )
    128         $dst_file = str_replace( basename( $src_file ), 'cropped-'.basename( $src_file ), $src_file );
     63    imagedestroy( $src ); // Free up memory
     64
     65    if ( ! $dst_file )
     66        $dst_file = str_replace( basename( $src_file ), 'cropped-' . basename( $src_file ), $src_file );
    12967
    13068    $dst_file = preg_replace( '/\\.[^\\.]+$/', '.jpg', $dst_file );
    … …  
    13674}
    13775
     76/**
     77 * wp_generate_attachment_metadata() - Generate post Image attachment Metadata
     78 *
     79 * @package WordPress
     80 * @internal Missing Long Description
     81 * @param   int     $attachment_id  Attachment Id to process
     82 * @param   string  $file   Filepath of the Attached image
     83 * @return  mixed           Metadata for attachment
     84 *
     85 */
    13886function wp_generate_attachment_metadata( $attachment_id, $file ) {
    13987    $attachment = get_post( $attachment_id );
    14088
    14189    $metadata = array();
    142     if ( preg_match('!^image/!', get_post_mime_type( $attachment )) ) {
    143         $imagesize = getimagesize($file);
    144         $metadata['width'] = $imagesize['0'];
    145         $metadata['height'] = $imagesize['1'];
    146         list($uwidth, $uheight) = get_udims($metadata['width'], $metadata['height']);
     90    if ( preg_match('!^image/!', get_post_mime_type( $attachment )) && file_is_displayable_image($file) ) {
     91        $imagesize = getimagesize( $file );
     92        $metadata['width'] = $imagesize[0];
     93        $metadata['height'] = $imagesize[1];
     94        list($uwidth, $uheight) = wp_shrink_dimensions($metadata['width'], $metadata['height']);
    14795        $metadata['hwstring_small'] = "height='$uheight' width='$uwidth'";
    14896        $metadata['file'] = $file;
    14997
    150         $max = apply_filters( 'wp_thumbnail_creation_size_limit', 3 * 1024 * 1024, $attachment_id, $file );
    151 
    152         if ( $max < 0 || $metadata['width'] * $metadata['height'] < $max ) {
    153             $max_side = apply_filters( 'wp_thumbnail_max_side_length', 128, $attachment_id, $file );
    154             $thumb = wp_create_thumbnail( $file, $max_side );
    155 
    156             if ( @file_exists($thumb) )
    157                 $metadata['thumb'] = basename($thumb);
     98        // make thumbnails and other intermediate sizes
     99        $sizes = array('thumbnail', 'medium');
     100        $sizes = apply_filters('intermediate_image_sizes', $sizes);
     101       
     102        foreach ($sizes as $size) {
     103            $resized = image_make_intermediate_size( $file, get_option("{$size}_size_w"), get_option("{$size}_size_h"), get_option("{$size}_crop") );
     104            if ( $resized )
     105                $metadata['sizes'][$size] = $resized;
    158106        }
     107           
     108        // fetch additional metadata from exif/iptc
     109        $image_meta = wp_read_image_metadata( $file );
     110        if ($image_meta)
     111            $metadata['image_meta'] = $image_meta;
     112
    159113    }
    160114    return apply_filters( 'wp_generate_attachment_metadata', $metadata );
    161115}
    162116
     117/**
     118 * wp_load_image() - Load an image which PHP Supports.
     119 *
     120 * @package WordPress
     121 * @internal Missing Long Description
     122 * @param   string  $file   Filename of the image to load
     123 * @return  resource        The resulting image resource on success, Error string on failure.
     124 *
     125 */
    163126function wp_load_image( $file ) {
    164     if ( ctype_digit( $file ) )
     127    if ( is_numeric( $file ) )
    165128        $file = get_attached_file( $file );
    166129
    167     if ( !file_exists( $file ) )
     130    if ( ! file_exists( $file ) )
    168131        return sprintf(__("File '%s' doesn't exist?"), $file);
    169132
    … …  
    171134        return __('The GD image library is not installed.');
    172135
    173     $contents = file_get_contents( $file );
    174 
    175     $image = imagecreatefromstring( $contents );
     136    // Set artificially high because GD uses uncompressed images in memory
     137    @ini_set('memory_limit', '256M');
     138    $image = imagecreatefromstring( file_get_contents( $file ) );
    176139
    177140    if ( !is_resource( $image ) )
    … …  
    181144}
    182145
     146/**
     147 * get_udims() - Calculated the new dimentions for downsampled images
     148 *
     149 * @package WordPress
     150 * @internal Missing Description
     151 * @see wp_shrink_dimensions()
     152 * @param   int     $width  Current width of the image
     153 * @param   int     $height Current height of the image
     154 * @return  mixed           Array(height,width) of shrunk dimensions.
     155 *
     156 */
     157function get_udims( $width, $height) {
     158    return wp_shrink_dimensions( $width, $height );
     159}
     160/**
     161 * wp_shrink_dimensions() - Calculates the new dimentions for a downsampled image.
     162 *
     163 * @package WordPress
     164 * @internal Missing Long Description
     165 * @param   int     $width  Current width of the image
     166 * @param   int     $height Current height of the image
     167 * @param   int     $wmax   Maximum wanted width
     168 * @param   int     $hmax   Maximum wanted height
     169 * @return  mixed           Array(height,width) of shrunk dimensions.
     170 *
     171 */
    183172function wp_shrink_dimensions( $width, $height, $wmax = 128, $hmax = 96 ) {
    184     if ( $height <= $hmax && $width <= $wmax )
    185         return array( $width, $height);
    186     elseif ( $width / $height > $wmax / $hmax )
    187         return array( $wmax, (int) ($height / $width * $wmax ));
     173    return wp_constrain_dimensions( $width, $height, $wmax, $hmax );
     174}
     175
     176// convert a fraction string to a decimal
     177function wp_exif_frac2dec($str) {
     178    @list( $n, $d ) = explode( '/', $str );
     179    if ( !empty($d) )
     180        return $n / $d;
     181    return $str;
     182}
     183
     184// convert the exif date format to a unix timestamp
     185function wp_exif_date2ts($str) {
     186    // seriously, who formats a date like 'YYYY:MM:DD hh:mm:ss'?
     187    @list( $date, $time ) = explode( ' ', trim($str) );
     188    @list( $y, $m, $d ) = explode( ':', $date );
     189
     190    return strtotime( "{$y}-{$m}-{$d} {$time}" );
     191}
     192
     193// get extended image metadata, exif or iptc as available
     194function wp_read_image_metadata( $file ) {
     195    if ( !file_exists( $file ) )
     196        return false;
     197
     198    list(,,$sourceImageType) = getimagesize( $file );
     199
     200    // exif contains a bunch of data we'll probably never need formatted in ways that are difficult to use.
     201    // We'll normalize it and just extract the fields that are likely to be useful.  Fractions and numbers
     202    // are converted to floats, dates to unix timestamps, and everything else to strings.
     203    $meta = array(
     204        'aperture' => 0,
     205        'credit' => '',
     206        'camera' => '',
     207        'caption' => '',
     208        'created_timestamp' => 0,
     209        'copyright' => '',
     210        'focal_length' => 0,
     211        'iso' => 0,
     212        'shutter_speed' => 0,
     213        'title' => '',
     214    );
     215
     216    // read iptc first, since it might contain data not available in exif such as caption, description etc
     217    if ( is_callable('iptcparse') ) {
     218        getimagesize($file, $info);
     219        if ( !empty($info['APP13']) ) {
     220            $iptc = iptcparse($info['APP13']);
     221            if ( !empty($iptc['2#110'][0]) ) // credit
     222                $meta['credit'] = trim( $iptc['2#110'][0] );
     223            elseif ( !empty($iptc['2#080'][0]) ) // byline
     224                $meta['credit'] = trim( $iptc['2#080'][0] );
     225            if ( !empty($iptc['2#055'][0]) and !empty($iptc['2#060'][0]) ) // created datee and time
     226                $meta['created_timestamp'] = strtotime($iptc['2#055'][0] . ' ' . $iptc['2#060'][0]);
     227            if ( !empty($iptc['2#120'][0]) ) // caption
     228                $meta['caption'] = trim( $iptc['2#120'][0] );
     229            if ( !empty($iptc['2#116'][0]) ) // copyright
     230                $meta['copyright'] = trim( $iptc['2#116'][0] );
     231            if ( !empty($iptc['2#005'][0]) ) // title
     232                $meta['title'] = trim( $iptc['2#005'][0] );
     233         }
     234    }
     235
     236    // fetch additional info from exif if available
     237    if ( is_callable('exif_read_data') && in_array($sourceImageType, apply_filters('wp_read_image_metadata_types', array(IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM)) ) ) {
     238        $exif = exif_read_data( $file );
     239        if (!empty($exif['FNumber']))
     240            $meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 );
     241        if (!empty($exif['Model']))
     242            $meta['camera'] = trim( $exif['Model'] );
     243        if (!empty($exif['DateTimeDigitized']))
     244            $meta['created_timestamp'] = wp_exif_date2ts($exif['DateTimeDigitized']);
     245        if (!empty($exif['FocalLength']))
     246            $meta['focal_length'] = wp_exif_frac2dec( $exif['FocalLength'] );
     247        if (!empty($exif['ISOSpeedRatings']))
     248            $meta['iso'] = $exif['ISOSpeedRatings'];
     249        if (!empty($exif['ExposureTime']))
     250            $meta['shutter_speed'] = wp_exif_frac2dec( $exif['ExposureTime'] );
     251    }
     252    // FIXME: try other exif libraries if available
     253
     254    return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType );
     255
     256}
     257
     258// is the file a real image file?
     259function file_is_valid_image($path) {
     260    $size = @getimagesize($path);
     261    return !empty($size);
     262}
     263
     264// is the file an image suitable for displaying within a web page?
     265function file_is_displayable_image($path) {
     266    $info = @getimagesize($path);
     267    if ( empty($info) )
     268        $result = false;
     269    elseif ( !in_array($info[2], array(IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG)) )
     270        // only gif, jpeg and png images can reliably be displayed
     271        $result = false;
     272    elseif ( $info['channels'] > 0 && $info['channels'] != 3 ) {
     273        // some web browsers can't display cmyk or grayscale jpegs
     274        $result = false;
     275    }
    188276    else
    189         return array( (int) ($width / $height * $hmax ), $hmax );
     277        $result = true;
     278       
     279    return apply_filters('file_is_displayable_image', $result, $path);
    190280}
    191281
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