diff -r 53cff4b4a802 -r bde1974c263b web/wp-includes/media.php --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/web/wp-includes/media.php Wed Feb 03 15:37:20 2010 +0000 @@ -0,0 +1,1303 @@ + 0 ) + $max_width = min( intval($content_width), $max_width ); + } elseif ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) && in_array( $size, array_keys( $_wp_additional_image_sizes ) ) ) { + $max_width = intval( $_wp_additional_image_sizes[$size]['width'] ); + $max_height = intval( $_wp_additional_image_sizes[$size]['height'] ); + if ( intval($content_width) > 0 ) + $max_width = min( intval($content_width), $max_width ); + } + // $size == 'full' has no constraint + else { + $max_width = $width; + $max_height = $height; + } + + list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size ); + + return wp_constrain_dimensions( $width, $height, $max_width, $max_height ); +} + +/** + * Retrieve width and height attributes using given width and height values. + * + * Both attributes are required in the sense that both parameters must have a + * value, but are optional in that if you set them to false or null, then they + * will not be added to the returned string. + * + * You can set the value using a string, but it will only take numeric values. + * If you wish to put 'px' after the numbers, then it will be stripped out of + * the return. + * + * @since 2.5.0 + * + * @param int|string $width Optional. Width attribute value. + * @param int|string $height Optional. Height attribute value. + * @return string HTML attributes for width and, or height. + */ +function image_hwstring($width, $height) { + $out = ''; + if ($width) + $out .= 'width="'.intval($width).'" '; + if ($height) + $out .= 'height="'.intval($height).'" '; + return $out; +} + +/** + * Scale an image to fit a particular size (such as 'thumb' or 'medium'). + * + * Array with image url, width, height, and whether is intermediate size, in + * that order is returned on success is returned. $is_intermediate is true if + * $url is a resized image, false if it is the original. + * + * The URL might be the original image, or it might be a resized version. This + * function won't create a new resized copy, it will just return an already + * resized one if it exists. + * + * A plugin may use the 'image_downsize' filter to hook into and offer image + * resizing services for images. The hook must return an array with the same + * elements that are returned in the function. The first element being the URL + * to the new image that was resized. + * + * @since 2.5.0 + * @uses apply_filters() Calls 'image_downsize' on $id and $size to provide + * resize services. + * + * @param int $id Attachment ID for image. + * @param string $size Optional, default is 'medium'. Size of image, can be 'thumbnail'. + * @return bool|array False on failure, array on success. + */ +function image_downsize($id, $size = 'medium') { + + if ( !wp_attachment_is_image($id) ) + return false; + + $img_url = wp_get_attachment_url($id); + $meta = wp_get_attachment_metadata($id); + $width = $height = 0; + $is_intermediate = false; + + // plugins can use this to provide resize services + if ( $out = apply_filters('image_downsize', false, $id, $size) ) + return $out; + + // try for a new style intermediate size + if ( $intermediate = image_get_intermediate_size($id, $size) ) { + $img_url = str_replace(basename($img_url), $intermediate['file'], $img_url); + $width = $intermediate['width']; + $height = $intermediate['height']; + $is_intermediate = true; + } + elseif ( $size == 'thumbnail' ) { + // fall back to the old thumbnail + if ( ($thumb_file = wp_get_attachment_thumb_file($id)) && $info = getimagesize($thumb_file) ) { + $img_url = str_replace(basename($img_url), basename($thumb_file), $img_url); + $width = $info[0]; + $height = $info[1]; + $is_intermediate = true; + } + } + if ( !$width && !$height && isset($meta['width'], $meta['height']) ) { + // any other type: use the real image + $width = $meta['width']; + $height = $meta['height']; + } + + if ( $img_url) { + // we have the actual image size, but might need to further constrain it if content_width is narrower + list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size ); + + return array( $img_url, $width, $height, $is_intermediate ); + } + return false; + +} + +/** + * Registers a new image size + */ +function add_image_size( $name, $width = 0, $height = 0, $crop = FALSE ) { + global $_wp_additional_image_sizes; + $_wp_additional_image_sizes[$name] = array( 'width' => absint( $width ), 'height' => absint( $height ), 'crop' => !!$crop ); +} + +/** + * Registers an image size for the post thumbnail + */ +function set_post_thumbnail_size( $width = 0, $height = 0, $crop = FALSE ) { + add_image_size( 'post-thumbnail', $width, $height, $crop ); +} + +/** + * An tag for an image attachment, scaling it down if requested. + * + * The filter 'get_image_tag_class' allows for changing the class name for the + * image without having to use regular expressions on the HTML content. The + * parameters are: what WordPress will use for the class, the Attachment ID, + * image align value, and the size the image should be. + * + * The second filter 'get_image_tag' has the HTML content, which can then be + * further manipulated by a plugin to change all attribute values and even HTML + * content. + * + * @since 2.5.0 + * + * @uses apply_filters() The 'get_image_tag_class' filter is the IMG element + * class attribute. + * @uses apply_filters() The 'get_image_tag' filter is the full IMG element with + * all attributes. + * + * @param int $id Attachment ID. + * @param string $alt Image Description for the alt attribute. + * @param string $title Image Description for the title attribute. + * @param string $align Part of the class name for aligning the image. + * @param string $size Optional. Default is 'medium'. + * @return string HTML IMG element for given image attachment + */ +function get_image_tag($id, $alt, $title, $align, $size='medium') { + + list( $img_src, $width, $height ) = image_downsize($id, $size); + $hwstring = image_hwstring($width, $height); + + $class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id; + $class = apply_filters('get_image_tag_class', $class, $id, $align, $size); + + $html = '' . esc_attr($alt) . ''; + + $html = apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size ); + + return $html; +} + +/** + * Calculates the new dimentions for a downsampled image. + * + * Same as {@link wp_shrink_dimensions()}, except the max parameters are + * optional. If either width or height are empty, no constraint is applied on + * that dimension. + * + * @since 2.5.0 + * + * @param int $current_width Current width of the image. + * @param int $current_height Current height of the image. + * @param int $max_width Optional. Maximum wanted width. + * @param int $max_height Optional. Maximum wanted height. + * @return array First item is the width, the second item is the height. + */ +function wp_constrain_dimensions( $current_width, $current_height, $max_width=0, $max_height=0 ) { + if ( !$max_width and !$max_height ) + return array( $current_width, $current_height ); + + $width_ratio = $height_ratio = 1.0; + + if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width ) + $width_ratio = $max_width / $current_width; + + if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height ) + $height_ratio = $max_height / $current_height; + + // the smaller ratio is the one we need to fit it to the constraining box + $ratio = min( $width_ratio, $height_ratio ); + + return array( intval($current_width * $ratio), intval($current_height * $ratio) ); +} + +/** + * Retrieve calculated resized dimensions for use in imagecopyresampled(). + * + * Calculate dimensions and coordinates for a resized image that fits within a + * specified width and height. If $crop is true, the largest matching central + * portion of the image will be cropped out and resized to the required size. + * + * @since 2.5.0 + * + * @param int $orig_w Original width. + * @param int $orig_h Original height. + * @param int $dest_w New width. + * @param int $dest_h New height. + * @param bool $crop Optional, default is false. Whether to crop image or resize. + * @return bool|array False, on failure. Returned array matches parameters for imagecopyresampled() PHP function. + */ +function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop = false) { + + if ($orig_w <= 0 || $orig_h <= 0) + return false; + // at least one of dest_w or dest_h must be specific + if ($dest_w <= 0 && $dest_h <= 0) + return false; + + if ( $crop ) { + // crop the largest possible portion of the original image that we can size to $dest_w x $dest_h + $aspect_ratio = $orig_w / $orig_h; + $new_w = min($dest_w, $orig_w); + $new_h = min($dest_h, $orig_h); + + if ( !$new_w ) { + $new_w = intval($new_h * $aspect_ratio); + } + + if ( !$new_h ) { + $new_h = intval($new_w / $aspect_ratio); + } + + $size_ratio = max($new_w / $orig_w, $new_h / $orig_h); + + $crop_w = round($new_w / $size_ratio); + $crop_h = round($new_h / $size_ratio); + + $s_x = floor( ($orig_w - $crop_w) / 2 ); + $s_y = floor( ($orig_h - $crop_h) / 2 ); + } else { + // don't crop, just resize using $dest_w x $dest_h as a maximum bounding box + $crop_w = $orig_w; + $crop_h = $orig_h; + + $s_x = 0; + $s_y = 0; + + list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h ); + } + + // if the resulting image would be the same size or larger we don't want to resize it + if ( $new_w >= $orig_w && $new_h >= $orig_h ) + return false; + + // the return array matches the parameters to imagecopyresampled() + // int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h + return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h ); + +} + +/** + * Scale down an image to fit a particular size and save a new copy of the image. + * + * The PNG transparency will be preserved using the function, as well as the + * image type. If the file going in is PNG, then the resized image is going to + * be PNG. The only supported image types are PNG, GIF, and JPEG. + * + * Some functionality requires API to exist, so some PHP version may lose out + * support. This is not the fault of WordPress (where functionality is + * downgraded, not actual defects), but of your PHP version. + * + * @since 2.5.0 + * + * @param string $file Image file path. + * @param int $max_w Maximum width to resize to. + * @param int $max_h Maximum height to resize to. + * @param bool $crop Optional. Whether to crop image or resize. + * @param string $suffix Optional. File Suffix. + * @param string $dest_path Optional. New image file path. + * @param int $jpeg_quality Optional, default is 90. Image quality percentage. + * @return mixed WP_Error on failure. String with new destination path. Array of dimensions from {@link image_resize_dimensions()} + */ +function image_resize( $file, $max_w, $max_h, $crop = false, $suffix = null, $dest_path = null, $jpeg_quality = 90 ) { + + $image = wp_load_image( $file ); + if ( !is_resource( $image ) ) + return new WP_Error('error_loading_image', $image); + + $size = @getimagesize( $file ); + if ( !$size ) + return new WP_Error('invalid_image', __('Could not read image size'), $file); + list($orig_w, $orig_h, $orig_type) = $size; + + $dims = image_resize_dimensions($orig_w, $orig_h, $max_w, $max_h, $crop); + if ( !$dims ) + return $dims; + list($dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) = $dims; + + $newimage = wp_imagecreatetruecolor( $dst_w, $dst_h ); + + imagecopyresampled( $newimage, $image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h); + + // convert from full colors to index colors, like original PNG. + if ( IMAGETYPE_PNG == $orig_type && !imageistruecolor( $image ) ) + imagetruecolortopalette( $newimage, false, imagecolorstotal( $image ) ); + + // we don't need the original in memory anymore + imagedestroy( $image ); + + // $suffix will be appended to the destination filename, just before the extension + if ( !$suffix ) + $suffix = "{$dst_w}x{$dst_h}"; + + $info = pathinfo($file); + $dir = $info['dirname']; + $ext = $info['extension']; + $name = basename($file, ".{$ext}"); + if ( !is_null($dest_path) and $_dest_path = realpath($dest_path) ) + $dir = $_dest_path; + $destfilename = "{$dir}/{$name}-{$suffix}.{$ext}"; + + if ( IMAGETYPE_GIF == $orig_type ) { + if ( !imagegif( $newimage, $destfilename ) ) + return new WP_Error('resize_path_invalid', __( 'Resize path invalid' )); + } elseif ( IMAGETYPE_PNG == $orig_type ) { + if ( !imagepng( $newimage, $destfilename ) ) + return new WP_Error('resize_path_invalid', __( 'Resize path invalid' )); + } else { + // all other formats are converted to jpg + $destfilename = "{$dir}/{$name}-{$suffix}.jpg"; + if ( !imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality, 'image_resize' ) ) ) + return new WP_Error('resize_path_invalid', __( 'Resize path invalid' )); + } + + imagedestroy( $newimage ); + + // Set correct file permissions + $stat = stat( dirname( $destfilename )); + $perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits + @ chmod( $destfilename, $perms ); + + return $destfilename; +} + +/** + * Resize an image to make a thumbnail or intermediate size. + * + * The returned array has the file size, the image width, and image height. The + * filter 'image_make_intermediate_size' can be used to hook in and change the + * values of the returned array. The only parameter is the resized file path. + * + * @since 2.5.0 + * + * @param string $file File path. + * @param int $width Image width. + * @param int $height Image height. + * @param bool $crop Optional, default is false. Whether to crop image to specified height and width or resize. + * @return bool|array False, if no image was created. Metadata array on success. + */ +function image_make_intermediate_size($file, $width, $height, $crop=false) { + if ( $width || $height ) { + $resized_file = image_resize($file, $width, $height, $crop); + if ( !is_wp_error($resized_file) && $resized_file && $info = getimagesize($resized_file) ) { + $resized_file = apply_filters('image_make_intermediate_size', $resized_file); + return array( + 'file' => basename( $resized_file ), + 'width' => $info[0], + 'height' => $info[1], + ); + } + } + return false; +} + +/** + * Retrieve the image's intermediate size (resized) path, width, and height. + * + * The $size parameter can be an array with the width and height respectively. + * If the size matches the 'sizes' metadata array for width and height, then it + * will be used. If there is no direct match, then the nearest image size larger + * than the specified size will be used. If nothing is found, then the function + * will break out and return false. + * + * The metadata 'sizes' is used for compatible sizes that can be used for the + * parameter $size value. + * + * The url path will be given, when the $size parameter is a string. + * + * @since 2.5.0 + * + * @param int $post_id Attachment ID for image. + * @param array|string $size Optional, default is 'thumbnail'. Size of image, either array or string. + * @return bool|array False on failure or array of file path, width, and height on success. + */ +function image_get_intermediate_size($post_id, $size='thumbnail') { + if ( !is_array( $imagedata = wp_get_attachment_metadata( $post_id ) ) ) + return false; + + // get the best one for a specified set of dimensions + if ( is_array($size) && !empty($imagedata['sizes']) ) { + foreach ( $imagedata['sizes'] as $_size => $data ) { + // already cropped to width or height; so use this size + if ( ( $data['width'] == $size[0] && $data['height'] <= $size[1] ) || ( $data['height'] == $size[1] && $data['width'] <= $size[0] ) ) { + $file = $data['file']; + list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size ); + return compact( 'file', 'width', 'height' ); + } + // add to lookup table: area => size + $areas[$data['width'] * $data['height']] = $_size; + } + if ( !$size || !empty($areas) ) { + // find for the smallest image not smaller than the desired size + ksort($areas); + foreach ( $areas as $_size ) { + $data = $imagedata['sizes'][$_size]; + if ( $data['width'] >= $size[0] || $data['height'] >= $size[1] ) { + $file = $data['file']; + list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size ); + return compact( 'file', 'width', 'height' ); + } + } + } + } + + if ( is_array($size) || empty($size) || empty($imagedata['sizes'][$size]) ) + return false; + + $data = $imagedata['sizes'][$size]; + // include the full filesystem path of the intermediate file + if ( empty($data['path']) && !empty($data['file']) ) { + $file_url = wp_get_attachment_url($post_id); + $data['path'] = path_join( dirname($imagedata['file']), $data['file'] ); + $data['url'] = path_join( dirname($file_url), $data['file'] ); + } + return $data; +} + +/** + * Retrieve an image to represent an attachment. + * + * A mime icon for files, thumbnail or intermediate size for images. + * + * @since 2.5.0 + * + * @param int $attachment_id Image attachment ID. + * @param string $size Optional, default is 'thumbnail'. + * @param bool $icon Optional, default is false. Whether it is an icon. + * @return bool|array Returns an array (url, width, height), or false, if no image is available. + */ +function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) { + + // get a thumbnail or intermediate image if there is one + if ( $image = image_downsize($attachment_id, $size) ) + return $image; + + $src = false; + + if ( $icon && $src = wp_mime_type_icon($attachment_id) ) { + $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' ); + $src_file = $icon_dir . '/' . basename($src); + @list($width, $height) = getimagesize($src_file); + } + if ( $src && $width && $height ) + return array( $src, $width, $height ); + return false; +} + +/** + * Get an HTML img element representing an image attachment + * + * @uses apply_filters() Calls 'wp_get_attachment_image_attributes' hook on attributes array + * @uses wp_get_attachment_image_src() Gets attachment file URL and dimensions + * @since 2.5.0 + * + * @param int $attachment_id Image attachment ID. + * @param string $size Optional, default is 'thumbnail'. + * @param bool $icon Optional, default is false. Whether it is an icon. + * @return string HTML img element or empty string on failure. + */ +function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = false, $attr = '') { + + $html = ''; + $image = wp_get_attachment_image_src($attachment_id, $size, $icon); + if ( $image ) { + list($src, $width, $height) = $image; + $hwstring = image_hwstring($width, $height); + if ( is_array($size) ) + $size = join('x', $size); + $attachment =& get_post($attachment_id); + $default_attr = array( + 'src' => $src, + 'class' => "attachment-$size", + 'alt' => trim(strip_tags( $attachment->post_excerpt )), + 'title' => trim(strip_tags( $attachment->post_title )), + ); + $attr = wp_parse_args($attr, $default_attr); + $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment ); + $attr = array_map( 'esc_attr', $attr ); + $html = rtrim(" $value ) { + $html .= " $name=" . '"' . $value . '"'; + } + $html .= ' />'; + } + + return $html; +} + +/** + * Adds a 'wp-post-image' class to post thumbnail thumbnails + * Uses the begin_fetch_post_thumbnail_html and end_fetch_post_thumbnail_html action hooks to + * dynamically add/remove itself so as to only filter post thumbnail thumbnails + * + * @author Mark Jaquith + * @since 2.9.0 + * @param array $attr Attributes including src, class, alt, title + * @return array + */ +function _wp_post_thumbnail_class_filter( $attr ) { + $attr['class'] .= ' wp-post-image'; + return $attr; +} + +/** + * Adds _wp_post_thumbnail_class_filter to the wp_get_attachment_image_attributes filter + * + * @author Mark Jaquith + * @since 2.9.0 + */ +function _wp_post_thumbnail_class_filter_add( $attr ) { + add_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' ); +} + +/** + * Removes _wp_post_thumbnail_class_filter from the wp_get_attachment_image_attributes filter + * + * @author Mark Jaquith + * @since 2.9.0 + */ +function _wp_post_thumbnail_class_filter_remove( $attr ) { + remove_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' ); +} + +add_shortcode('wp_caption', 'img_caption_shortcode'); +add_shortcode('caption', 'img_caption_shortcode'); + +/** + * The Caption shortcode. + * + * Allows a plugin to replace the content that would otherwise be returned. The + * filter is 'img_caption_shortcode' and passes an empty string, the attr + * parameter and the content parameter values. + * + * The supported attributes for the shortcode are 'id', 'align', 'width', and + * 'caption'. + * + * @since 2.6.0 + * + * @param array $attr Attributes attributed to the shortcode. + * @param string $content Optional. Shortcode content. + * @return string + */ +function img_caption_shortcode($attr, $content = null) { + + // Allow plugins/themes to override the default caption template. + $output = apply_filters('img_caption_shortcode', '', $attr, $content); + if ( $output != '' ) + return $output; + + extract(shortcode_atts(array( + 'id' => '', + 'align' => 'alignnone', + 'width' => '', + 'caption' => '' + ), $attr)); + + if ( 1 > (int) $width || empty($caption) ) + return $content; + + if ( $id ) $id = 'id="' . esc_attr($id) . '" '; + + return '
' + . do_shortcode( $content ) . '

' . $caption . '

'; +} + +add_shortcode('gallery', 'gallery_shortcode'); + +/** + * The Gallery shortcode. + * + * This implements the functionality of the Gallery Shortcode for displaying + * WordPress images on a post. + * + * @since 2.5.0 + * + * @param array $attr Attributes attributed to the shortcode. + * @return string HTML content to display gallery. + */ +function gallery_shortcode($attr) { + global $post, $wp_locale; + + static $instance = 0; + $instance++; + + // Allow plugins/themes to override the default gallery template. + $output = apply_filters('post_gallery', '', $attr); + if ( $output != '' ) + return $output; + + // We're trusting author input, so let's at least make sure it looks like a valid orderby statement + if ( isset( $attr['orderby'] ) ) { + $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] ); + if ( !$attr['orderby'] ) + unset( $attr['orderby'] ); + } + + extract(shortcode_atts(array( + 'order' => 'ASC', + 'orderby' => 'menu_order ID', + 'id' => $post->ID, + 'itemtag' => 'dl', + 'icontag' => 'dt', + 'captiontag' => 'dd', + 'columns' => 3, + 'size' => 'thumbnail', + 'include' => '', + 'exclude' => '' + ), $attr)); + + $id = intval($id); + if ( 'RAND' == $order ) + $orderby = 'none'; + + if ( !empty($include) ) { + $include = preg_replace( '/[^0-9,]+/', '', $include ); + $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) ); + + $attachments = array(); + foreach ( $_attachments as $key => $val ) { + $attachments[$val->ID] = $_attachments[$key]; + } + } elseif ( !empty($exclude) ) { + $exclude = preg_replace( '/[^0-9,]+/', '', $exclude ); + $attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) ); + } else { + $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) ); + } + + if ( empty($attachments) ) + return ''; + + if ( is_feed() ) { + $output = "\n"; + foreach ( $attachments as $att_id => $attachment ) + $output .= wp_get_attachment_link($att_id, $size, true) . "\n"; + return $output; + } + + $itemtag = tag_escape($itemtag); + $captiontag = tag_escape($captiontag); + $columns = intval($columns); + $itemwidth = $columns > 0 ? floor(100/$columns) : 100; + $float = $wp_locale->text_direction == 'rtl' ? 'right' : 'left'; + + $selector = "gallery-{$instance}"; + + $output = apply_filters('gallery_style', " + + + \n"; + + return $output; +} + +/** + * Display previous image link that has the same post parent. + * + * @since 2.5.0 + * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text; + * @param string $text Optional, default is false. If included, link will reflect $text variable. + * @return string HTML content. + */ +function previous_image_link($size = 'thumbnail', $text = false) { + adjacent_image_link(true, $size, $text); +} + +/** + * Display next image link that has the same post parent. + * + * @since 2.5.0 + * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text; + * @param string $text Optional, default is false. If included, link will reflect $text variable. + * @return string HTML content. + */ +function next_image_link($size = 'thumbnail', $text = false) { + adjacent_image_link(false, $size, $text); +} + +/** + * Display next or previous image link that has the same post parent. + * + * Retrieves the current attachment object from the $post global. + * + * @since 2.5.0 + * + * @param bool $prev Optional. Default is true to display previous link, true for next. + */ +function adjacent_image_link($prev = true, $size = 'thumbnail', $text = false) { + global $post; + $post = get_post($post); + $attachments = array_values(get_children( array('post_parent' => $post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID') )); + + foreach ( $attachments as $k => $attachment ) + if ( $attachment->ID == $post->ID ) + break; + + $k = $prev ? $k - 1 : $k + 1; + + if ( isset($attachments[$k]) ) + echo wp_get_attachment_link($attachments[$k]->ID, $size, true, false, $text); +} + +/** + * Retrieve taxonomies attached to the attachment. + * + * @since 2.5.0 + * + * @param int|array|object $attachment Attachment ID, Attachment data array, or Attachment data object. + * @return array Empty array on failure. List of taxonomies on success. + */ +function get_attachment_taxonomies($attachment) { + if ( is_int( $attachment ) ) + $attachment = get_post($attachment); + else if ( is_array($attachment) ) + $attachment = (object) $attachment; + + if ( ! is_object($attachment) ) + return array(); + + $filename = basename($attachment->guid); + + $objects = array('attachment'); + + if ( false !== strpos($filename, '.') ) + $objects[] = 'attachment:' . substr($filename, strrpos($filename, '.') + 1); + if ( !empty($attachment->post_mime_type) ) { + $objects[] = 'attachment:' . $attachment->post_mime_type; + if ( false !== strpos($attachment->post_mime_type, '/') ) + foreach ( explode('/', $attachment->post_mime_type) as $token ) + if ( !empty($token) ) + $objects[] = "attachment:$token"; + } + + $taxonomies = array(); + foreach ( $objects as $object ) + if ( $taxes = get_object_taxonomies($object) ) + $taxonomies = array_merge($taxonomies, $taxes); + + return array_unique($taxonomies); +} + +/** + * Check if the installed version of GD supports particular image type + * + * @since 2.9.0 + * + * @param $mime_type string + * @return bool + */ +function gd_edit_image_support($mime_type) { + if ( function_exists('imagetypes') ) { + switch( $mime_type ) { + case 'image/jpeg': + return (imagetypes() & IMG_JPG) != 0; + case 'image/png': + return (imagetypes() & IMG_PNG) != 0; + case 'image/gif': + return (imagetypes() & IMG_GIF) != 0; + } + } else { + switch( $mime_type ) { + case 'image/jpeg': + return function_exists('imagecreatefromjpeg'); + case 'image/png': + return function_exists('imagecreatefrompng'); + case 'image/gif': + return function_exists('imagecreatefromgif'); + } + } + return false; +} + +/** + * Create new GD image resource with transparency support + * + * @since 2.9.0 + * + * @param $width + * @param $height + * @return image resource + */ +function wp_imagecreatetruecolor($width, $height) { + $img = imagecreatetruecolor($width, $height); + if ( is_resource($img) && function_exists('imagealphablending') && function_exists('imagesavealpha') ) { + imagealphablending($img, false); + imagesavealpha($img, true); + } + return $img; +} + +/** + * API for easily embedding rich media such as videos and images into content. + * + * @package WordPress + * @subpackage Embed + * @since 2.9.0 + */ +class WP_Embed { + var $handlers = array(); + var $post_ID; + var $usecache = true; + var $linkifunknown = true; + + /** + * PHP4 constructor + */ + function WP_Embed() { + return $this->__construct(); + } + + /** + * PHP5 constructor + */ + function __construct() { + // Hack to get the [embed] shortcode to run before wpautop() + add_filter( 'the_content', array(&$this, 'run_shortcode'), 8 ); + + // Attempts to embed all URLs in a post + if ( get_option('embed_autourls') ) + add_filter( 'the_content', array(&$this, 'autoembed'), 8 ); + + // After a post is saved, invalidate the oEmbed cache + add_action( 'save_post', array(&$this, 'delete_oembed_caches') ); + + // After a post is saved, cache oEmbed items via AJAX + add_action( 'edit_form_advanced', array(&$this, 'maybe_run_ajax_cache') ); + } + + /** + * Process the [embed] shortcode. + * + * Since the [embed] shortcode needs to be run earlier than other shortcodes, + * this function removes all existing shortcodes, registers the [embed] shortcode, + * calls {@link do_shortcode()}, and then re-registers the old shortcodes. + * + * @uses $shortcode_tags + * @uses remove_all_shortcodes() + * @uses add_shortcode() + * @uses do_shortcode() + * + * @param string $content Content to parse + * @return string Content with shortcode parsed + */ + function run_shortcode( $content ) { + global $shortcode_tags; + + // Backup current registered shortcodes and clear them all out + $orig_shortcode_tags = $shortcode_tags; + remove_all_shortcodes(); + + add_shortcode( 'embed', array(&$this, 'shortcode') ); + + // Do the shortcode (only the [embed] one is registered) + $content = do_shortcode( $content ); + + // Put the original shortcodes back + $shortcode_tags = $orig_shortcode_tags; + + return $content; + } + + /** + * If a post/page was saved, then output Javascript to make + * an AJAX request that will call WP_Embed::cache_oembed(). + */ + function maybe_run_ajax_cache() { + global $post_ID; + + if ( empty($post_ID) || empty($_GET['message']) || 1 != $_GET['message'] ) + return; + +?> + +handlers[$priority][$id] = array( + 'regex' => $regex, + 'callback' => $callback, + ); + } + + /** + * Unregister a previously registered embed handler. Do not use this function directly, use {@link wp_embed_unregister_handler()} instead. + * + * @param string $id The handler ID that should be removed. + * @param int $priority Optional. The priority of the handler to be removed (default: 10). + */ + function unregister_handler( $id, $priority = 10 ) { + if ( isset($this->handlers[$priority][$id]) ) + unset($this->handlers[$priority][$id]); + } + + /** + * The {@link do_shortcode()} callback function. + * + * Attempts to convert a URL into embed HTML. Starts by checking the URL against the regex of the registered embed handlers. + * If none of the regex matches and it's enabled, then the URL will be given to the {@link WP_oEmbed} class. + * + * @uses wp_oembed_get() + * @uses wp_parse_args() + * @uses wp_embed_defaults() + * @uses WP_Embed::maybe_make_link() + * @uses get_option() + * @uses current_user_can() + * @uses wp_cache_get() + * @uses wp_cache_set() + * @uses get_post_meta() + * @uses update_post_meta() + * + * @param array $attr Shortcode attributes. + * @param string $url The URL attempting to be embeded. + * @return string The embed HTML on success, otherwise the original URL. + */ + function shortcode( $attr, $url = '' ) { + global $post; + + if ( empty($url) ) + return ''; + + $rawattr = $attr; + $attr = wp_parse_args( $attr, wp_embed_defaults() ); + + // Look for known internal handlers + ksort( $this->handlers ); + foreach ( $this->handlers as $priority => $handlers ) { + foreach ( $handlers as $id => $handler ) { + if ( preg_match( $handler['regex'], $url, $matches ) && is_callable( $handler['callback'] ) ) { + if ( false !== $return = call_user_func( $handler['callback'], $matches, $attr, $url, $rawattr ) ) + return apply_filters( 'embed_handler_html', $return, $url, $attr ); + } + } + } + + $post_ID = ( !empty($post->ID) ) ? $post->ID : null; + if ( !empty($this->post_ID) ) // Potentially set by WP_Embed::cache_oembed() + $post_ID = $this->post_ID; + + // Unknown URL format. Let oEmbed have a go. + if ( $post_ID ) { + + // Check for a cached result (stored in the post meta) + $cachekey = '_oembed_' . md5( $url . serialize( $attr ) ); + if ( $this->usecache ) { + $cache = get_post_meta( $post_ID, $cachekey, true ); + + // Failures are cached + if ( '{{unknown}}' === $cache ) + return $this->maybe_make_link( $url ); + + if ( !empty($cache) ) + return apply_filters( 'embed_oembed_html', $cache, $url, $attr ); + } + + // Use oEmbed to get the HTML + $attr['discover'] = ( apply_filters('embed_oembed_discover', false) && author_can( $post_ID, 'unfiltered_html' ) ) ? true : false; + $html = wp_oembed_get( $url, $attr ); + + // Cache the result + $cache = ( $html ) ? $html : '{{unknown}}'; + update_post_meta( $post_ID, $cachekey, $cache ); + + // If there was a result, return it + if ( $html ) + return apply_filters( 'embed_oembed_html', $html, $url, $attr ); + } + + // Still unknown + return $this->maybe_make_link( $url ); + } + + /** + * Delete all oEmbed caches. + * + * @param int $post_ID Post ID to delete the caches for. + */ + function delete_oembed_caches( $post_ID ) { + $post_metas = get_post_custom_keys( $post_ID ); + if ( empty($post_metas) ) + return; + + foreach( $post_metas as $post_meta_key ) { + if ( '_oembed_' == substr( $post_meta_key, 0, 8 ) ) + delete_post_meta( $post_ID, $post_meta_key ); + } + } + + /** + * Triggers a caching of all oEmbed results. + * + * @param int $post_ID Post ID to do the caching for. + */ + function cache_oembed( $post_ID ) { + $post = get_post( $post_ID ); + + if ( empty($post->ID) || !in_array( $post->post_type, apply_filters( 'embed_cache_oembed_types', array( 'post', 'page' ) ) ) ) + return; + + // Trigger a caching + if ( !empty($post->post_content) ) { + $this->post_ID = $post->ID; + $this->usecache = false; + + $content = $this->run_shortcode( $post->post_content ); + if ( get_option('embed_autourls') ) + $this->autoembed( $content ); + + $this->usecache = true; + } + } + + /** + * Passes any unlinked URLs that are on their own line to {@link WP_Embed::shortcode()} for potential embedding. + * + * @uses WP_Embed::autoembed_callback() + * + * @param string $content The content to be searched. + * @return string Potentially modified $content. + */ + function autoembed( $content ) { + return preg_replace_callback( '|^\s*(https?://[^\s"]+)\s*$|im', array(&$this, 'autoembed_callback'), $content ); + } + + /** + * Callback function for {@link WP_Embed::autoembed()}. + * + * @uses WP_Embed::shortcode() + * + * @param array $match A regex match array. + * @return string The embed HTML on success, otherwise the original URL. + */ + function autoembed_callback( $match ) { + $oldval = $this->linkifunknown; + $this->linkifunknown = false; + $return = $this->shortcode( array(), $match[1] ); + $this->linkifunknown = $oldval; + + return "\n$return\n"; + } + + /** + * Conditionally makes a hyperlink based on an internal class variable. + * + * @param string $url URL to potentially be linked. + * @return string Linked URL or the original URL. + */ + function maybe_make_link( $url ) { + $output = ( $this->linkifunknown ) ? '' . esc_html($url) . '' : $url; + return apply_filters( 'embed_maybe_make_link', $output, $url ); + } +} +$wp_embed = new WP_Embed(); + +/** + * Register an embed handler. This function should probably only be used for sites that do not support oEmbed. + * + * @since 2.9.0 + * @see WP_Embed::register_handler() + */ +function wp_embed_register_handler( $id, $regex, $callback, $priority = 10 ) { + global $wp_embed; + $wp_embed->register_handler( $id, $regex, $callback, $priority ); +} + +/** + * Unregister a previously registered embed handler. + * + * @since 2.9.0 + * @see WP_Embed::unregister_handler() + */ +function wp_embed_unregister_handler( $id, $priority = 10 ) { + global $wp_embed; + $wp_embed->unregister_handler( $id, $priority ); +} + +/** + * Create default array of embed parameters. + * + * @since 2.9.0 + * + * @return array Default embed parameters. + */ +function wp_embed_defaults() { + if ( !empty($GLOBALS['content_width']) ) + $theme_width = (int) $GLOBALS['content_width']; + + $width = get_option('embed_size_w'); + + if ( !$width && !empty($theme_width) ) + $width = $theme_width; + + if ( !$width ) + $width = 500; + + return apply_filters( 'embed_defaults', array( + 'width' => $width, + 'height' => 700, + ) ); +} + +/** + * Based on a supplied width/height example, return the biggest possible dimensions based on the max width/height. + * + * @since 2.9.0 + * @uses wp_constrain_dimensions() This function passes the widths and the heights. + * + * @param int $example_width The width of an example embed. + * @param int $example_height The height of an example embed. + * @param int $max_width The maximum allowed width. + * @param int $max_height The maximum allowed height. + * @return array The maximum possible width and height based on the example ratio. + */ +function wp_expand_dimensions( $example_width, $example_height, $max_width, $max_height ) { + $example_width = (int) $example_width; + $example_height = (int) $example_height; + $max_width = (int) $max_width; + $max_height = (int) $max_height; + + return wp_constrain_dimensions( $example_width * 1000000, $example_height * 1000000, $max_width, $max_height ); +} + +/** + * Attempts to fetch the embed HTML for a provided URL using oEmbed. + * + * @since 2.9.0 + * @see WP_oEmbed + * + * @uses _wp_oembed_get_object() + * @uses WP_oEmbed::get_html() + * + * @param string $url The URL that should be embeded. + * @param array $args Addtional arguments and parameters. + * @return string The original URL on failure or the embed HTML on success. + */ +function wp_oembed_get( $url, $args = '' ) { + require_once( 'class-oembed.php' ); + $oembed = _wp_oembed_get_object(); + return $oembed->get_html( $url, $args ); +} + +/** + * Adds a URL format and oEmbed provider URL pair. + * + * @since 2.9.0 + * @see WP_oEmbed + * + * @uses _wp_oembed_get_object() + * + * @param string $format The format of URL that this provider can handle. You can use asterisks as wildcards. + * @param string $provider The URL to the oEmbed provider. + * @param boolean $regex Whether the $format parameter is in a regex format or not. + */ +function wp_oembed_add_provider( $format, $provider, $regex = false ) { + require_once( 'class-oembed.php' ); + $oembed = _wp_oembed_get_object(); + $oembed->providers[$format] = array( $provider, $regex ); +}