brasofilo

WPSE 51920 diff

May 12th, 2012
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  1. <?php
  2. /*
  3.  *
  4.  *
  5.  *
  6.  *
  7.  */
  8.  
  9. /* Example Usage:
  10.  * bt_add_image_size( 'product-screenshot', 300, 300, array( 'left', 'top' ) );
  11.  * bt_add_image_size( 'product-feature', 460, 345, array( 'center', 'top' ) );
  12.  */
  13.  
  14. add_filter( 'intermediate_image_sizes_advanced', 'bt_intermediate_image_sizes_advanced' );
  15. add_filter( 'wp_generate_attachment_metadata', 'bt_generate_attachment_metadata', 10, 2 );
  16.  
  17. /**
  18.  * Registers a new image size with cropping positions
  19.  *
  20.  * The $crop parameter works as in the 'add_image_size' function taking true or
  21.  * false values. If set to true, the default cropping position is 'center', 'center'.
  22.  *
  23.  * The $crop parameter also takes an array of the format
  24.  * array( x_crop_position, y_crop_position )
  25.  * x_crop_position can be 'left', 'center', 'right'
  26.  * y_crop_position can be 'top', 'center', 'bottom'
  27.  *
  28.  * @param string $name Image size identifier.
  29.  * @param int $width Image width.
  30.  * @param int $height Image height.
  31.  * @param bool|array $crop Optional, default is false. Whether to crop image to specified height and width or resize. An array can specify positioning of the crop area.
  32.  * @return bool|array False, if no image was created. Metadata array on success.
  33.  */
  34. function bt_add_image_size( $name, $width = 0, $height = 0, $crop = false ) {
  35.     global $_wp_additional_image_sizes;
  36.     $_wp_additional_image_sizes[$name] = array( 'width' => absint( $width ), 'height' => absint( $height ), 'crop' => $crop );
  37. }
  38.  
  39.  
  40. /**
  41.  * Returning no sizes (an empty array) will force
  42.  * wp_generate_attachment_metadata to skip creating intermediate image sizes on
  43.  * upload, then we can run our own resizing functions by hooking into the
  44.  * 'wp_generate_attachment_metadata' filter
  45.  */
  46. function bt_intermediate_image_sizes_advanced( $sizes ) {
  47.     return array();
  48. }
  49.  
  50.  
  51. function bt_generate_attachment_metadata( $metadata, $attachment_id ) {
  52.     $attachment = get_post( $attachment_id );
  53.    
  54.     $uploadPath = wp_upload_dir();
  55.     $file = path_join($uploadPath['basedir'], $metadata['file']);
  56.  
  57.     if ( !preg_match('!^image/!', get_post_mime_type( $attachment )) || !file_is_displayable_image( $file ) ) return $metadata;
  58.  
  59.     global $_wp_additional_image_sizes;
  60.  
  61.     foreach ( get_intermediate_image_sizes() as $s ) {
  62.         $sizes[$s] = array( 'width' => '', 'height' => '', 'crop' => FALSE );
  63.         if ( isset( $_wp_additional_image_sizes[$s]['width'] ) )
  64.             $sizes[$s]['width'] = intval( $_wp_additional_image_sizes[$s]['width'] ); // For theme-added sizes
  65.         else
  66.             $sizes[$s]['width'] = get_option( "{$s}_size_w" ); // For default sizes set in options
  67.         if ( isset( $_wp_additional_image_sizes[$s]['height'] ) )
  68.             $sizes[$s]['height'] = intval( $_wp_additional_image_sizes[$s]['height'] ); // For theme-added sizes
  69.         else
  70.             $sizes[$s]['height'] = get_option( "{$s}_size_h" ); // For default sizes set in options
  71.         if ( isset( $_wp_additional_image_sizes[$s]['crop'] ) )
  72.             $sizes[$s]['crop'] = $_wp_additional_image_sizes[$s]['crop'];
  73.         else
  74.             $sizes[$s]['crop'] = get_option( "{$s}_crop" );
  75.     }
  76.  
  77.     foreach ( $sizes as $size => $size_data ) {
  78.         $resized = bt_image_make_intermediate_size( $file, $size_data['width'], $size_data['height'], $size_data['crop'] );
  79.         if ( $resized )
  80.             $metadata['sizes'][$size] = $resized;
  81.     }
  82.    
  83.     return $metadata;
  84. }
  85.  
  86.  
  87. /**
  88.  * Resize an image to make a thumbnail or intermediate size.
  89.  *
  90.  * The returned array has the file size, the image width, and image height. The
  91.  * filter 'image_make_intermediate_size' can be used to hook in and change the
  92.  * values of the returned array. The only parameter is the resized file path.
  93.  *
  94.  * @param string $file File path.
  95.  * @param int $width Image width.
  96.  * @param int $height Image height.
  97.  * @param bool|array $crop Optional, default is false. Whether to crop image to specified height and width or resize. An array can specify positioning of the crop area.
  98.  * @return bool|array False, if no image was created. Metadata array on success.
  99.  */
  100. function bt_image_make_intermediate_size( $file, $width, $height, $crop = false ) {
  101.     if ( $width || $height ) {
  102.         $resized_file = bt_image_resize( $file, $width, $height, $crop, null, null, 90 );
  103.         if ( !is_wp_error( $resized_file ) && $resized_file && $info = getimagesize( $resized_file ) ) {
  104.             $resized_file = apply_filters('image_make_intermediate_size', $resized_file);
  105.             return array(
  106.                 'file' => wp_basename( $resized_file ),
  107.                 'width' => $info[0],
  108.                 'height' => $info[1],
  109.             );
  110.         }
  111.     }
  112.     return false;
  113. }
  114.  
  115.  
  116.  
  117. /**
  118.  * Retrieve calculated resized dimensions for use in imagecopyresampled().
  119.  *
  120.  * Calculate dimensions and coordinates for a resized image that fits within a
  121.  * specified width and height. If $crop is true, the largest matching central
  122.  * portion of the image will be cropped out and resized to the required size.
  123.  *
  124.  * @param int $orig_w Original width.
  125.  * @param int $orig_h Original height.
  126.  * @param int $dest_w New width.
  127.  * @param int $dest_h New height.
  128.  * @param bool $crop Optional, default is false. Whether to crop image or resize.
  129.  * @return bool|array False, on failure. Returned array matches parameters for imagecopyresampled() PHP function.
  130.  */
  131. function bt_image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop = false) {
  132.  
  133.     if ($orig_w <= 0 || $orig_h <= 0)
  134.         return false;
  135.     // at least one of dest_w or dest_h must be specific
  136.     if ($dest_w <= 0 && $dest_h <= 0)
  137.         return false;
  138.  
  139.     if ( $crop ) {
  140.         // crop the largest possible portion of the original image that we can size to $dest_w x $dest_h
  141.         $aspect_ratio = $orig_w / $orig_h;
  142.         $new_w = min($dest_w, $orig_w);
  143.         $new_h = min($dest_h, $orig_h);
  144.  
  145.         if ( !$new_w ) {
  146.             $new_w = intval($new_h * $aspect_ratio);
  147.         }
  148.  
  149.         if ( !$new_h ) {
  150.             $new_h = intval($new_w / $aspect_ratio);
  151.         }
  152.  
  153.         $size_ratio = max($new_w / $orig_w, $new_h / $orig_h);
  154.  
  155.         $crop_w = round($new_w / $size_ratio);
  156.         $crop_h = round($new_h / $size_ratio);
  157.  
  158.         if ( !is_array( $crop ) || count( $crop ) != 2 ) {
  159.             $crop = apply_filters( 'image_resize_crop_default', array( 'center', 'center' ) );
  160.         }
  161.        
  162.         switch ( $crop[0] ) {
  163.             case 'left': $s_x = 0; break;
  164.             case 'right': $s_x = $orig_w - $crop_w; break;
  165.             default: $s_x = floor( ( $orig_w - $crop_w ) / 2 );
  166.         }
  167.  
  168.         switch ( $crop[1] ) {
  169.             case 'top': $s_y = 0; break;
  170.             case 'bottom': $s_y = $orig_h - $crop_h; break;
  171.             default: $s_y = floor( ( $orig_h - $crop_h ) / 2 );
  172.         }
  173.     } else {
  174.         // don't crop, just resize using $dest_w x $dest_h as a maximum bounding box
  175.         $crop_w = $orig_w;
  176.         $crop_h = $orig_h;
  177.  
  178.         $s_x = 0;
  179.         $s_y = 0;
  180.  
  181.         list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
  182.     }
  183.  
  184.     // if the resulting image would be the same size or larger we don't want to resize it
  185.     if ( $new_w >= $orig_w && $new_h >= $orig_h )
  186.         return false;
  187.  
  188.     // the return array matches the parameters to imagecopyresampled()
  189.     // int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
  190.     return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );
  191.  
  192. }
  193.  
  194.  
  195. /**
  196.  * Scale down an image to fit a particular size and save a new copy of the image.
  197.  *
  198.  * The PNG transparency will be preserved using the function, as well as the
  199.  * image type. If the file going in is PNG, then the resized image is going to
  200.  * be PNG. The only supported image types are PNG, GIF, and JPEG.
  201.  *
  202.  * Some functionality requires API to exist, so some PHP version may lose out
  203.  * support. This is not the fault of WordPress (where functionality is
  204.  * downgraded, not actual defects), but of your PHP version.
  205.  *
  206.  * @since 2.5.0
  207.  *
  208.  * @param string $file Image file path.
  209.  * @param int $max_w Maximum width to resize to.
  210.  * @param int $max_h Maximum height to resize to.
  211.  * @param bool $crop Optional. Whether to crop image or resize.
  212.  * @param string $suffix Optional. File Suffix.
  213.  * @param string $dest_path Optional. New image file path.
  214.  * @param int $jpeg_quality Optional, default is 90. Image quality percentage.
  215.  * @return mixed WP_Error on failure. String with new destination path.
  216.  */
  217. function bt_image_resize( $file, $max_w, $max_h, $crop = false, $suffix = null, $dest_path = null, $jpeg_quality = 90 ) {
  218.  
  219.     $image = wp_load_image( $file );
  220.     if ( !is_resource( $image ) )
  221.         return new WP_Error( 'error_loading_image', $image, $file );
  222.  
  223.     $size = @getimagesize( $file );
  224.     if ( !$size )
  225.         return new WP_Error('invalid_image', __('Could not read image size'), $file);
  226.     list($orig_w, $orig_h, $orig_type) = $size;
  227.  
  228.     // Rotate if EXIF 'Orientation' is set
  229.     // This code is from the reverted patch at
  230.     // http://core.trac.wordpress.org/changeset/11746/trunk/wp-includes/media.php
  231.     $rotate = false;
  232.     if ( is_callable( 'exif_read_data' ) && in_array( $orig_type, apply_filters( 'wp_read_image_metadata_types', array( IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM ) ) ) ) {
  233.         $exif = @exif_read_data( $file, null, true );
  234.         if ( $exif && isset( $exif['IFD0'] ) && is_array( $exif['IFD0'] ) && isset( $exif['IFD0']['Orientation'] ) ) {
  235.             if ( 6 == $exif['IFD0']['Orientation'] )
  236.                 $rotate = 90;
  237.             elseif ( 8 == $exif['IFD0']['Orientation'] )
  238.                 $rotate = 270;
  239.         }
  240.     }
  241.    
  242.     if ( $rotate )
  243.         list($max_h,$max_w) = array($max_w,$max_h);
  244.  
  245.     $dims = bt_image_resize_dimensions($orig_w, $orig_h, $max_w, $max_h, $crop);
  246.     if ( !$dims )
  247.         return new WP_Error( 'error_getting_dimensions', __('Could not calculate resized image dimensions') );
  248.     list($dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) = $dims;
  249.  
  250.     $newimage = wp_imagecreatetruecolor( $dst_w, $dst_h );
  251.  
  252.     if ( $rotate )
  253.         list($src_y,$src_x) = array($src_x,$src_y);
  254.  
  255.     imagecopyresampled( $newimage, $image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h);
  256.  
  257.     // convert from full colors to index colors, like original PNG.
  258.     if ( IMAGETYPE_PNG == $orig_type && function_exists('imageistruecolor') && !imageistruecolor( $image ) )
  259.         imagetruecolortopalette( $newimage, false, imagecolorstotal( $image ) );
  260.  
  261.     // we don't need the original in memory anymore
  262.     imagedestroy( $image );
  263.  
  264.     // $suffix will be appended to the destination filename, just before the extension
  265.     if ( !$suffix ) {
  266.         if ( $rotate )
  267.             $suffix = "{$dst_h}x{$dst_w}";
  268.         else
  269.             $suffix = "{$dst_w}x{$dst_h}";
  270.     }
  271.  
  272.     $info = pathinfo($file);
  273.     $dir = $info['dirname'];
  274.     $ext = $info['extension'];
  275.     $name = wp_basename($file, ".$ext");
  276.  
  277.     if ( !is_null($dest_path) and $_dest_path = realpath($dest_path) )
  278.         $dir = $_dest_path;
  279.     $destfilename = "{$dir}/{$name}-{$suffix}.{$ext}";
  280.  
  281.     if ( IMAGETYPE_GIF == $orig_type ) {
  282.         if ( !imagegif( $newimage, $destfilename ) )
  283.             return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
  284.     } elseif ( IMAGETYPE_PNG == $orig_type ) {
  285.         if ( !imagepng( $newimage, $destfilename ) )
  286.             return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
  287.     } else {
  288.         if ( $rotate ) {
  289.             $newimage = _rotate_image_resource( $newimage, 360 - $rotate );
  290.         }
  291.        
  292.         // all other formats are converted to jpg
  293.         $destfilename = "{$dir}/{$name}-{$suffix}.jpg";
  294.         $return = imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality, 'image_resize' ) );
  295.         if ( !$return )
  296.             return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
  297.     }
  298.  
  299.     imagedestroy( $newimage );
  300.  
  301.     // Set correct file permissions
  302.     $stat = stat( dirname( $destfilename ));
  303.     $perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
  304.     @ chmod( $destfilename, $perms );
  305.  
  306.     return $destfilename;
  307. }
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