wp-admin/includes/image.php

   1 <?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
 106 function 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
 108                 $src_file = get_attached_file( $src_file );
 109
 110         $src = wp_load_image( $src_file );
 111
 112         if ( !is_resource( $src ))
 113                 return $src;
 114
 115         $dst = imagecreatetruecolor( $dst_w, $dst_h );
 116
 117         if ( $src_abs ) {
 118                 $src_w -= $src_x;
 119                 $src_h -= $src_y;
 120         }
 121
 122         if (function_exists('imageantialias'))
 123                 imageantialias( $dst, true );
 124
 125         imagecopyresampled( $dst, $src, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
 126
 127         if ( !$dst_file )
 128                 $dst_file = str_replace( basename( $src_file ), 'cropped-'.basename( $src_file ), $src_file );
 129
 130         $dst_file = preg_replace( '/\\.[^\\.]+$/', '.jpg', $dst_file );
 131
 132         if ( imagejpeg( $dst, $dst_file ) )
 133                 return $dst_file;
 134         else
 135                 return false;
 136 }
 137
 138 function wp_generate_attachment_metadata( $attachment_id, $file ) {
 139         $attachment = get_post( $attachment_id );
 140
 141         $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']);
 147                 $metadata['hwstring_small'] = "height='$uheight' width='$uwidth'";
 148                 $metadata['file'] = $file;
 149
 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);
 158                 }
 159         }
 160         return apply_filters( 'wp_generate_attachment_metadata', $metadata );
 161 }
 162
 163 function wp_load_image( $file ) {
 164         if ( ctype_digit( $file ) )
 165                 $file = get_attached_file( $file );
 166
 167         if ( !file_exists( $file ) )
 168                 return sprintf(__("File '%s' doesn't exist?"), $file);
 169
 170         if ( ! function_exists('imagecreatefromstring') )
 171                 return __('The GD image library is not installed.');
 172
 173         $contents = file_get_contents( $file );
 174
 175         $image = imagecreatefromstring( $contents );
 176
 177         if ( !is_resource( $image ) )
 178                 return sprintf(__("File '%s' is not an image."), $file);
 179
 180         return $image;
 181 }
 182
 183 function 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 * $wmax ));
 188         else
 189                 return array( (int) ($width / $height * $hmax ), $hmax );
 190 }
 191
 192 ?>