<?php



/**

 * Title         : Aqua Resizer

 * Description   : Resizes WordPress images on the fly

 * Version       : 1.2.0

 * Author        : Syamil MJ

 * Author URI    : http://aquagraphite.com

 * License       : WTFPL - http://sam.zoy.org/wtfpl/

 * Documentation : https://github.com/sy4mil/Aqua-Resizer/

 *

 * @param string  $url    - (required) must be uploaded using wp media uploader

 * @param int     $width  - (required)

 * @param int     $height - (optional)

 * @param bool    $crop   - (optional) default to soft crop

 * @param bool    $single - (optional) returns an array if false

 * @uses  wp_upload_dir()

 * @uses  image_resize_dimensions()

 * @uses  wp_get_image_editor()

 *

 * @return str|array

 */



if(!class_exists('Rev_Aq_Resize')) {

    class Rev_Aq_Resize

    {

        /**

         * The singleton instance

         */

        static private $instance = null;



        /**

         * No initialization allowed

         */

        private function __construct() {}



        /**

         * No cloning allowed

         */

        private function __clone() {}



        /**

         * For your custom default usage you may want to initialize an Aq_Resize object by yourself and then have own defaults

         */

        static public function getInstance() {

            if(self::$instance == null) {

                self::$instance = new self;

            }



            return self::$instance;

        }



        /**

         * Run, forest.

         */

        public function process( $url, $width = null, $height = null, $crop = null, $single = true, $upscale = false ) {

            // Validate inputs.

            if ( ! $url || ( ! $width && ! $height ) ) return false;



            // Caipt'n, ready to hook.

            //if ( true === $upscale ) add_filter( 'image_resize_dimensions', array($this, 'aq_upscale'), 10, 6 );



            // Define upload path & dir.

            $upload_info = wp_upload_dir();

            $upload_dir = $upload_info['basedir'];

            $upload_url = $upload_info['baseurl'];

            

            $http_prefix = "http://";

            $https_prefix = "https://";

            

            /* if the $url scheme differs from $upload_url scheme, make them match 

               if the schemes differe, images don't show up. */

            if(!strncmp($url,$https_prefix,strlen($https_prefix))){ //if url begins with https:// make $upload_url begin with https:// as well

                $upload_url = str_replace($http_prefix,$https_prefix,$upload_url);

            }

            elseif(!strncmp($url,$http_prefix,strlen($http_prefix))){ //if url begins with http:// make $upload_url begin with http:// as well

                $upload_url = str_replace($https_prefix,$http_prefix,$upload_url);      

            }

            



            // Check if $img_url is local.

            if ( false === strpos( $url, $upload_url ) ) return false;



            // Define path of image.

            $rel_path = str_replace( $upload_url, '', $url );

            $img_path = $upload_dir . $rel_path;



            // Check if img path exists, and is an image indeed.

            if ( ! file_exists( $img_path ) or ! getimagesize( $img_path ) ) return false;



            // Get image info.

            $info = pathinfo( $img_path );

            $ext = $info['extension'];

            list( $orig_w, $orig_h ) = getimagesize( $img_path );



            // Get image size after cropping.

            $dims = image_resize_dimensions( $orig_w, $orig_h, $width, $height, $crop );

            $dst_w = $dims[4];

            $dst_h = $dims[5];



            // Return the original image only if it exactly fits the needed measures.

            if ( ! $dims && ( ( ( null === $height && $orig_w == $width ) xor ( null === $width && $orig_h == $height ) ) xor ( $height == $orig_h && $width == $orig_w ) ) ) {

                $img_url = $url;

                $dst_w = $orig_w;

                $dst_h = $orig_h;

            } else {

                // Use this to check if cropped image already exists, so we can return that instead.

                $suffix = "{$dst_w}x{$dst_h}";

                $dst_rel_path = str_replace( '.' . $ext, '', $rel_path );

                $destfilename = "{$upload_dir}{$dst_rel_path}-{$suffix}.{$ext}";



                if ( ! $dims || ( true == $crop && false == $upscale && ( $dst_w < $width || $dst_h < $height ) ) ) {

                    // Can't resize, so return false saying that the action to do could not be processed as planned.

                    return false;

                }

                // Else check if cache exists.

                elseif ( file_exists( $destfilename ) && getimagesize( $destfilename ) ) {

                    $img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";

                }

                // Else, we resize the image and return the new resized image url.

                else {



                    $editor = wp_get_image_editor( $img_path );



                    if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) )

                        return false;



                    $resized_file = $editor->save();



                    if ( ! is_wp_error( $resized_file ) ) {

                        $resized_rel_path = str_replace( $upload_dir, '', $resized_file['path'] );

                        $img_url = $upload_url . $resized_rel_path;

                    } else {

                        return false;

                    }



                }

            }



            // Okay, leave the ship.

            if ( true === $upscale ) remove_filter( 'image_resize_dimensions', array( $this, 'aq_upscale' ) );



            // Return the output.

            if ( $single ) {

                // str return.

                $image = $img_url;

            } else {

                // array return.

                $image = array (

                    0 => $img_url,

                    1 => $dst_w,

                    2 => $dst_h

                );

            }



            return $image;

        }



        /**

         * Callback to overwrite WP computing of thumbnail measures

         */

        function aq_upscale( $default, $orig_w, $orig_h, $dest_w, $dest_h, $crop ) {

            if ( ! $crop ) return null; // Let the wordpress default function handle this.



            // Here is the point we allow to use larger image size than the original one.

            $aspect_ratio = $orig_w / $orig_h;

            $new_w = $dest_w;

            $new_h = $dest_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 );



            return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );

        }

    }

}











if(!function_exists('rev_aq_resize')) {



    /**

     * This is just a tiny wrapper function for the class above so that there is no

     * need to change any code in your own WP themes. Usage is still the same :)

     */

    function rev_aq_resize( $url, $width = null, $height = null, $crop = null, $single = true, $upscale = false ) {

        $aq_resize = Rev_Aq_Resize::getInstance();

        return $aq_resize->process( $url, $width, $height, $crop, $single, $upscale );

    }

    

}





