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<?php
/*
Plugin Name: Custom Image Sizes
Plugin URI: http://austinmatzko.com/wordpress-plugins/filosofo-custom-image-sizes/
Description: A plugin that creates custom image sizes for image attachments.
Author: Austin Matzko
Author URI: http://austinmatzko.com
Version: 1.1
Copyright 2011 Austin Matzko ( email : austin at pressedcode dot com )
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
*/
if ( ! class_exists( 'Filosofo_Custom_Image_Sizes' ) ) {
class Filosofo_Custom_Image_Sizes {
public function __construct()
{
add_filter('image_downsize', array(&$this, 'filter_image_downsize'), 99, 3);
}
/**
* Callback for the "image_downsize" filter.
*
* @param bool $ignore A value meant to discard unfiltered info returned from this filter.
* @param int $attachment_id The ID of the attachment for which we want a certain size.
* @param string $size_name The name of the size desired.
*/
public function filter_image_downsize($ignore = false, $attachment_id = 0, $size_name = 'thumbnail')
{
global $_wp_additional_image_sizes;
$attachment_id = (int) $attachment_id;
if ( is_array( $size_name ) && 1 < count( $size_name ) ) {
$size_name = array_shift( $size_name ) . 'x' . array_shift( $size_name );
}
$size_name = trim($size_name);
$meta = wp_get_attachment_metadata($attachment_id);
/* the requested size does not yet exist for this attachment */
if (
empty( $meta['sizes'] ) ||
empty( $meta['sizes'][$size_name] )
) {
// let's first see if this is a registered size
if ( isset( $_wp_additional_image_sizes[$size_name] ) ) {
$height = (int) $_wp_additional_image_sizes[$size_name]['height'];
$width = (int) $_wp_additional_image_sizes[$size_name]['width'];
$crop = (bool) $_wp_additional_image_sizes[$size_name]['crop'];
// if not, see if name is of form [width]x[height] and use that to crop
} else if ( preg_match('#^(\d+)x(\d+)$#', $size_name, $matches) ) {
$height = (int) $matches[2];
$width = (int) $matches[1];
$crop = true;
}
if ( ! empty( $height ) && ! empty( $width ) ) {
$resized_path = $this->_generate_attachment($attachment_id, $width, $height, $crop);
do_action( 'custom_image_size_resized_path', $resized_path, $attachment_id, $width, $height, $crop );
$fullsize_url = wp_get_attachment_url($attachment_id);
$file_name = basename($resized_path);
$new_url = str_replace(basename($fullsize_url), $file_name, $fullsize_url);
if ( ! empty( $resized_path ) ) {
$meta['sizes'][$size_name] = array(
'file' => $file_name,
'width' => $width,
'height' => $height,
);
wp_update_attachment_metadata($attachment_id, $meta);
return array(
$new_url,
$width,
$height,
true
);
}
}
}
return false;
}
/**
* Creates a cropped version of an image for a given attachment ID.
*
* @param int $attachment_id The attachment for which to generate a cropped image.
* @param int $width The width of the cropped image in pixels.
* @param int $height The height of the cropped image in pixels.
* @param bool $crop Whether to crop the generated image.
* @return string The full path to the cropped image. Empty if failed.
*/
private function _generate_attachment($attachment_id = 0, $width = 0, $height = 0, $crop = true)
{
$attachment_id = (int) $attachment_id;
$width = (int) $width;
$height = (int) $height;
$crop = (bool) $crop;
$original_path = get_attached_file($attachment_id);
// fix a WP bug up to 2.9.2
if ( ! function_exists('wp_load_image') ) {
require_once ABSPATH . 'wp-admin/includes/image.php';
}
$resized_path = @image_resize($original_path, $width, $height, $crop);
if (
! is_wp_error($resized_path) &&
! is_array($resized_path)
) {
return $resized_path;
// perhaps this image already exists. If so, return it.
} else {
$orig_info = pathinfo($original_path);
$suffix = "{$width}x{$height}";
$dir = $orig_info['dirname'];
$ext = isset( $orig_info['extension'] ) ? $orig_info['extension'] : '';
$name = basename($original_path, ".{$ext}");
$destfilename = "{$dir}/{$name}-{$suffix}.{$ext}";
if ( file_exists( $destfilename ) ) {
return $destfilename;
}
}
return '';
}
}
function initialize_custom_image_sizes()
{
global $filosofo_custom_image_sizes;
$filosofo_custom_image_sizes = new Filosofo_Custom_Image_Sizes;
}
add_action('plugins_loaded', 'initialize_custom_image_sizes');
}