<?php

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/**

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* PNG to JPG conversion: Png2jpg class

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*

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* @package Smush\Core\Modules

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*

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* @version 2.4

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*

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* @author Umesh Kumar <umesh@incsub.com>

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*

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* @copyright (c) 2016, Incsub (http://incsub.com)

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*/

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namespace Smush\Core\Modules;

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use Exception;

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use Imagick;

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use Smush\Core\Helper;

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use WP_Smush;

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if ( ! defined( 'WPINC' ) ) {

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die;

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}

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/**

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* Class Png2jpg

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*/

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class Png2jpg extends Abstract_Module {

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/**

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* Module slug.

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*

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* @var string

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*/

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protected $slug = 'png_to_jpg';

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/**

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* Whether module is pro or not.

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*

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* @var string

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*/

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protected $is_pro = true;

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/**

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* Init method.

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*

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* @since 3.0

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*/

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public function init() {

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}

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/**

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* Check if Imagick is available or not

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*

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* @return bool True/False Whether Imagick is available or not

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*/

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private function supports_imagick() {

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if ( ! class_exists( '\Imagick' ) ) {

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return false;

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}

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return true;

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}

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/**

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* Check if GD is loaded

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*

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* @return bool True/False Whether GD is available or not

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*/

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private function supports_gd() {

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if ( ! function_exists( 'gd_info' ) ) {

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return false;

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}

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return true;

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}

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/**

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* Save can be converted status before resizing the image,

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* because the the image might be lost the undefined-transparent behavior after resizing.

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*

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* @see WP_Image_Editor_Imagick::thumbnail_image()

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* WP Resize function will convert Imagick::ALPHACHANNEL_UNDEFINED -> Imagick::ALPHACHANNEL_OPAQUE.

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*

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* @param array $sizes Array of sizes containing max width and height for all the uploaded images.

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* @param string $file_path Image file path.

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* @param int $id Image id.

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*

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* @return array the Original $sizes.

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*

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* @since 3.9.6

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*/

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public function cache_can_be_converted_status( $sizes, $file_path, $id ) {

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// Call can_be_converted and cache the status.

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$this->can_be_converted( $id, 'full', '', $file_path );

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// Always return $sizes.

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return $sizes;

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}

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/**

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* Checks if the Given PNG file is transparent or not

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*

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* @param string $id Attachment ID.

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* @param string $file File path for the attachment.

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*

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* @return bool|int

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*/

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private function is_transparent( $id = '', $file = '' ) {

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// No attachment id/ file path, return.

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if ( empty( $id ) && empty( $file ) ) {

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return false;

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}

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if ( empty( $file ) ) {

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// This downloads the file from S3 when S3 is enabled.

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$file = Helper::get_attached_file( $id );

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}

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// Check if File exists.

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if ( empty( $file ) || ! file_exists( $file ) ) {

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Helper::logger()->png2jpg()->info( sprintf( 'File [%s(%d)] is empty or does not exist.', Helper::clean_file_path( $file ), $id ) );

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return false;

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}

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$transparent = '';

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// Try to get transparency using Imagick.

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if ( $this->supports_imagick() ) {

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try {

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$im = new Imagick( $file );

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return $im->getImageAlphaChannel();

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} catch ( Exception $e ) {

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Helper::logger()->png2jpg()->error( 'Imagick: Error in checking PNG transparency ' . $e->getMessage() );

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}

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} else {

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// Simple check.

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// Src: http://camendesign.com/code/uth1_is-png-32bit.

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if ( ord( file_get_contents( $file, false, null, 25, 1 ) ) & 4 ) {

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Helper::logger()->png2jpg()->info( sprintf( 'File [%s(%d)] is an PNG 32-bit.', Helper::clean_file_path( $file ), $id ) );

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return true;

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}

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// Src: http://www.jonefox.com/blog/2011/04/15/how-to-detect-transparency-in-png-images/.

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$contents = file_get_contents( $file );

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if ( stripos( $contents, 'PLTE' ) !== false && stripos( $contents, 'tRNS' ) !== false ) {

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Helper::logger()->png2jpg()->info( sprintf( 'File [%s(%d)] is an PNG 8-bit.', Helper::clean_file_path( $file ), $id ) );

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return true;

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}

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// If both the conditions failed, that means not transparent.

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return false;

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}

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// If Imagick is installed, and the code exited due to some error.

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// Src: StackOverflow.

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if ( empty( $transparent ) && $this->supports_gd() ) {

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// Check for transparency using GD.

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$i = imagecreatefrompng( $file );

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$palette = ( imagecolortransparent( $i ) < 0 );

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if ( $palette ) {

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return true;

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}

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}

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return false;

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}

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/**

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* Check if given attachment id can be converted to JPEG or not

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*

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* @param string $id Atachment ID.

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* @param string $size Image size.

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* @param string $mime Mime type.

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* @param string $file File.

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*

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* @since 3.9.6 We removed the private method should_convert

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* and we also handled the case which we need to delete the download file inside S3.

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*

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* Note, we also used this for checking resmush, so we only download the attached file (s3)

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* if it's necessary (self::is_transparent()). Check the comment on self::__construct() for detail.

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*

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* @return bool True/False Can be converted or not

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*/

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public function can_be_converted( $id = '', $size = 'full', $mime = '', $file = '' ) {

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// If PNG2JPG not enabled, or is not smushable, return.

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if ( ! $this->is_active() || ! Helper::is_smushable( $id ) ) {

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return false;

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}

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// Check it from the cache for full size.

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if ( 'full' === $size && null !== Helper::cache_get( $id, 'png2jpg_can_be_converted' ) ) {

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return Helper::cache_get( $id, 'png2jpg_can_be_converted' );

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}

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// False if not a PNG.

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$mime = empty( $mime ) ? get_post_mime_type( $id ) : $mime;

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if ( 'image/png' !== $mime && 'image/x-png' !== $mime ) {

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return false;

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}

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// Return if Imagick and GD is not available.

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if ( ! $this->supports_imagick() && ! $this->supports_gd() ) {

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Helper::logger()->png2jpg()->warning( 'The site does not support Imagick or GD.' );

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return false;

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}

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// If already tried the conversion.

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if ( get_post_meta( $id, 'wp-smush-pngjpg_savings', true ) ) {

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Helper::logger()->png2jpg()->info( sprintf( 'File [%s(%d)] already tried the conversion.', Helper::clean_file_path( $file ), $id ) );

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return false;

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}

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// Check if registered size is supposed to be converted or not.

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if ( 'full' !== $size && WP_Smush::get_instance()->core()->mod->smush->skip_image_size( $size ) ) {

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return false;

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}

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// Make sure $file is not empty.

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if ( empty( $file ) ) {

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$file = Helper::get_attached_file( $id );// S3+.

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}

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/**

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* Filter whether to convert the PNG to JPG or not

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*

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* @since 2.4

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*

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* @param bool $should_convert Current choice for image conversion

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*

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* @param int $id Attachment id

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*

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* @param string $file File path for the image

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*

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* @param string $size Image size being converted

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*/

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$should_convert = apply_filters( 'wp_smush_convert_to_jpg', ! $this->is_transparent( $id, $file ), $id, $file, $size );

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if ( 'full' === $size ) {

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/**

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* We used this method inside Backup::create_backup(), Smush function, and filter wp_smush_resize_sizes,

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* so cache the result to avoid to check it again.

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*/

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Helper::cache_set( $id, $should_convert, 'png2jpg_can_be_converted' );

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}

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return $should_convert;

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}

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/**

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* Check whether to resmush image or not.

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*

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* @since 3.9.6

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*

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* @usedby Smush\App\Ajax::scan_images()

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*

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* @param bool $should_resmush Current status.

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* @param int $attachment_id Attachment ID.

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* @return bool|string png2jpg|TRUE|FALSE

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*/

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public function should_resmush( $should_resmush, $attachment_id ) {

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if ( ! $should_resmush && $this->can_be_converted( $attachment_id ) ) {

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$should_resmush = 'png2jpg';

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}

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return $should_resmush;

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}

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/**

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* Update the image URL, MIME Type, Attached File, file path in Meta, URL in post content

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*

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* @param string $id Attachment ID.

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* @param string $o_file Original File Path that has to be replaced.

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* @param string $n_file New File Path which replaces the old file.

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* @param string $meta Attachment Meta.

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* @param string $size_k Image Size.

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* @param string $o_type Operation Type "conversion", "restore".

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*

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* @return array Attachment Meta with updated file path.

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*/

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public function update_image_path( $id, $o_file, $n_file, $meta, $size_k, $o_type = 'conversion' ) {

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// Upload Directory.

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$upload_dir = wp_upload_dir();

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// Upload Path.

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$upload_path = trailingslashit( $upload_dir['basedir'] );

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$dir_name = pathinfo( $o_file, PATHINFO_DIRNAME );

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// Full Path to new file.

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$n_file_path = path_join( $dir_name, $n_file );

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// Current URL for image.

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$o_url = wp_get_attachment_url( $id );

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// Update URL for image size.

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if ( 'full' !== $size_k ) {

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$base_url = dirname( $o_url );

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$o_url = $base_url . '/' . basename( $o_file );

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}

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// Update File path, Attached File, GUID.

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$meta = empty( $meta ) ? wp_get_attachment_metadata( $id ) : $meta;

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$mime = Helper::get_mime_type( $n_file_path );

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/**

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* If there's no fileinfo extension installed, the mime type will be returned as false.

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* As a fallback, we set it manually.

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*

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* @since 3.8.3

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*/

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if ( false === $mime ) {

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$mime = 'conversion' === $o_type ? 'image/jpeg' : 'image/png';

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}

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$del_file = true;

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// Update File Path, Attached file, Mime Type for Image.

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if ( 'full' === $size_k ) {

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if ( ! empty( $meta ) ) {

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$new_file = str_replace( $upload_path, '', $n_file_path );

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$meta['file'] = $new_file;

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// Update Attached File.

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if ( ! update_attached_file( $id, $meta['file'] ) ) {

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$del_file = false;

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}

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}

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// Update Mime type.

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if ( ! wp_update_post(

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array(

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'ID' => $id,

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'post_mime_type' => $mime,

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)

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) ) {

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$del_file = false;

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}

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} else {

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$meta['sizes'][ $size_k ]['file'] = basename( $n_file );

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$meta['sizes'][ $size_k ]['mime-type'] = $mime;

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}

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// To be called after the attached file key is updated for the image.

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if ( ! $this->update_image_url( $id, $size_k, $n_file, $o_url ) ) {

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$del_file = false;

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}

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/**

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* Delete the Original files if backup not enabled

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* We only delete the file if we don't have any issues while updating the DB.

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* SMUSH-1088?focusedCommentId=92914.

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*/

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if ( $del_file && 'conversion' === $o_type ) {

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// We might need to backup the full size file, will delete it later if we don't need to use it for backup.

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if ( 'full' !== $size_k ) {

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/**

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* We only need to keep the original file as a backup file.

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* and try to delete this file on cloud too, e.g S3.

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*/

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Helper::delete_permanently( $o_file, $id );

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}

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}

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return $meta;

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}

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/**

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* Replace the file if there are savings, and return savings

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*

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* @param string $file Original File Path.

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* @param array $result Array structure.

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* @param string $n_file Updated File path.

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*

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* @return array

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*/

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private function replace_file( $file = '', $result = array(), $n_file = '' ) {

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if ( empty( $file ) || empty( $n_file ) ) {

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return $result;

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}

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// Get the file size of original image.

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$o_file_size = filesize( $file );

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$n_file = path_join( dirname( $file ), $n_file );

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$n_file_size = filesize( $n_file );

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// If there aren't any savings return.

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if ( $n_file_size >= $o_file_size ) {

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// Delete the JPG image and return.

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unlink( $n_file );

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Helper::logger()->png2jpg()->notice( sprintf( 'The new file [%s](%s) is larger than the original file [%s](%s).', Helper::clean_file_path( $n_file ), size_format( $n_file_size ), Helper::clean_file_path( $file ), size_format( $o_file_size ) ) );

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return $result;

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}

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// Get the savings.

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$savings = $o_file_size - $n_file_size;

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// Store Stats.

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$savings = array(

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'bytes' => $savings,

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'size_before' => $o_file_size,

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'size_after' => $n_file_size,

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);

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$result['savings'] = $savings;

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return $result;

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}

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/**

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* Perform the conversion process, using WordPress Image Editor API

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*

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* @param string $id Attachment ID.

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* @param string $file Attachment File path.

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* @param string $meta Attachment meta.

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* @param string $size Image size, default empty for full image.

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*

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* @return array $result array(

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* 'meta' => array Update Attachment metadata

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* 'savings' => Reduction of Image size in bytes

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* )

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*/

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private function convert_to_jpg( $id = '', $file = '', $meta = '', $size = 'full' ) {

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$result = array(

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'meta' => $meta,

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'savings' => '',

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);

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// Flag: Whether the image was converted or not.

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if ( 'full' === $size ) {

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$result['converted'] = false;

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}

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// If any of the values is not set.

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if ( empty( $id ) || empty( $file ) || empty( $meta ) || ! file_exists( $file ) ) {

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Helper::logger()->png2jpg()->info( sprintf( 'Meta file [%s(%d)] is empty or file not found.', Helper::clean_file_path( $file ), $id ) );

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return $result;

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}

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$editor = wp_get_image_editor( $file );

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if ( is_wp_error( $editor ) ) {

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// Use custom method maybe.

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Helper::logger()->png2jpg()->error( sprintf( 'Image Editor cannot load file [%s(%d)]: %s.', Helper::clean_file_path( $file ), $id, $editor->get_error_message() ) );

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return $result;

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}

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$n_file = pathinfo( $file );

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if ( ! empty( $n_file['filename'] ) && $n_file['dirname'] ) {

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// Get a unique File name.

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$file_detail = Helper::cache_get( $id, 'convert_to_jpg' );

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if ( $file_detail ) {

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list( $old_main_filename, $new_main_filename ) = $file_detail;

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/**

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* Thumbnail name.

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* E.g.

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* test-150x150.jpg

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* test-1-150x150.jpg

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*/

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if ( $old_main_filename !== $new_main_filename ) {

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$n_file['filename'] = str_replace( $old_main_filename, $new_main_filename, $n_file['filename'] );

[462] Fix | Delete

}

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$n_file['filename'] .= '.jpg';

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} else {

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$org_filename = $n_file['filename'];

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/**

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* Get unique file name for the main file.

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* E.g.

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* test.png => test.jpg

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* test.png => test-1.jpg

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*/

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$n_file['filename'] = wp_unique_filename( $n_file['dirname'], $org_filename . '.jpg' );

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Helper::cache_set( $id, array( $org_filename, pathinfo( $n_file['filename'], PATHINFO_FILENAME ) ), 'convert_to_jpg' );

[474] Fix | Delete

}

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$n_file = path_join( $n_file['dirname'], $n_file['filename'] );

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} else {

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Helper::logger()->png2jpg()->error( sprintf( 'Cannot retrieve the path info of file [%s(%d)].', Helper::clean_file_path( $file ), $id ) );

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return $result;

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}

[480] Fix | Delete

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// Save PNG as JPG.

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$new_image_info = $editor->save( $n_file, 'image/jpeg' );

[483] Fix | Delete

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// If image editor was unable to save the image, return.

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if ( is_wp_error( $new_image_info ) ) {

[486] Fix | Delete

return $result;

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}

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$n_file = ! empty( $new_image_info ) ? $new_image_info['file'] : '';

[490] Fix | Delete

[491] Fix | Delete

// Replace file, and get savings.

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$result = $this->replace_file( $file, $result, $n_file );

[493] Fix | Delete

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if ( ! empty( $result['savings'] ) ) {

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if ( 'full' === $size ) {

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$result['converted'] = true;

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}

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// Update the File Details. and get updated meta.

[499] Fix | Delete