tag. Empty values will be omitted. function image_hwstring($width, $height) { $out = ''; if ($width) $out .= 'width="'.intval($width).'" '; if ($height) $out .= 'height="'.intval($height).'" '; return $out; } // Scale an image to fit a particular size (such as 'thumb' or 'medium'), and return an image URL, height and width. // The URL might be the original image, or it might be a resized version. This function won't create a new resized copy, it will just return an already resized one if it exists. // returns an array($url, $width, $height) function image_downsize($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; // 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']; } elseif ( $size == 'thumbnail' ) { // fall back to the old thumbnail if ( $thumb_file = wp_get_attachment_thumb_file() && $info = getimagesize($thumb_file) ) { $img_url = str_replace(basename($img_url), basename($thumb_file), $img_url); $width = $info[0]; $height = $info[1]; } } if ( !$width && !$height && isset($meta['width'], $meta['height']) ) { // any other type: use the real image and constrain it list( $width, $height ) = image_constrain_size_for_editor( $meta['width'], $meta['height'], $size ); } return array( $img_url, $width, $height ); } // return an tag for the given image attachment, scaling it down if requested function get_image_tag($id, $alt, $title, $align, $rel = false, $size='medium') { list( $img_src, $width, $height ) = image_downsize($id, $size); $hwstring = image_hwstring($width, $height); $html = ' '.attribute_escape($alt).'

'; $html = apply_filters( 'image_send_to_editor', $html, $id, $alt, $title, $align, $url ); return $html; } // same as wp_shrink_dimensions, except the max parameters are optional. // if either width or height are empty, no constraint is applied on that dimension. 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 > $max_width ) $width_ratio = $max_width / $current_width; if ( $max_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) ); } // calculate dimensions and coordinates for a resized image that fits within a specified width and height // if $crop is true, the largest matching central portion of the image will be cropped out and resized to the required size function image_resize_dimensions($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); $crop_w = ceil($new_w / $size_ratio); $crop_h = ceil($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, $s_x, $s_y, $new_w, $new_h, $crop_w, $crop_h); } // Scale down an image to fit a particular size and save a new copy of the image function image_resize( $file, $max_w, $max_h, $crop=false, $suffix=null, $dest_path=null, $jpeg_quality=75) { $image = wp_load_image( $file ); if ( !is_resource( $image ) ) return new WP_Error('error_loading_image', $image); list($orig_w, $orig_h, $orig_type) = getimagesize( $file ); $dims = image_resize_dimensions($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 = imagecreatetruecolor( $dst_w, $dst_h); // preserve PNG transparency if ( IMAGETYPE_PNG == $orig_type && function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' ) ) { imagealphablending( $newimage, false); imagesavealpha( $newimage, true); } imagecopyresampled( $newimage, $image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h); // 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 ( $orig_type == IMAGETYPE_GIF ) { if (!imagegif( $newimage, $destfilename ) ) return new WP_Error('resize_path_invalid', __( 'Resize path invalid' )); } elseif ( $orig_type == IMAGETYPE_PNG ) { 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, $jpeg_quality ) ) 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 $destfilename; } // resize an image to make a thumbnail or intermediate size, and return metadata describing the new copy // returns false if no image was created function image_make_intermediate_size($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) ) { return array( 'file' => basename( $resized_file ), 'width' => $info[0], 'height' => $info[1], ); } } return false; } function image_get_intermediate_size($post_id, $size='thumbnail') { if ( !$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; return $imagedata['sizes'][$size]; } // get an image to represent an attachment - a mime icon for files, thumbnail or intermediate size for images // 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; 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, $height ); return false; } // as per wp_get_attachment_image_src, but returns an tag function wp_get_attachment_image($attachment_id, $size='thumbnail', $icon = false) { $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); $html = '

'; } return $html; } add_shortcode('gallery', 'gallery_shortcode'); function gallery_shortcode($attr) { global $post; // Allow plugins/themes to override the default gallery template. $output = apply_filters('post_gallery', '', $attr); if ( $output != '' ) return $output; $attachments = get_children("post_parent=$post->ID&post_type=attachment&post_mime_type=image&orderby=\"menu_order ASC, ID ASC\""); if ( empty($attachments) ) return ''; $output = apply_filters('gallery_style', "

"); foreach ( $attachments as $id => $attachment ) { $link = wp_get_attachment_link($id, 'thumbnail', true); $output .= "

$link

"; if ( ++$i % 3 == 0 ) $output .= '
'; } $output .= "

\n"; return $output; } function previous_image_link() { adjacent_image_link(true); } function next_image_link() { adjacent_image_link(false); } function adjacent_image_link($prev = true) { global $post; $post = get_post($post); $attachments = array_values(get_children("post_parent=$post->post_parent&post_type=attachment&post_mime_type=image&orderby=\"menu_order ASC, ID ASC\"")); 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, 'thumbnail', true); } ?>