<?php

/**

 * File contains all the administration image manipulation functions.

 *

 * @package WordPress

 * @subpackage Administration

 */

/**

 * Crops an image to a given size.

 *

 * @since 2.1.0

 *

 * @param string|int   $src      The source file or Attachment ID.

 * @param int          $src_x    The start x position to crop from.

 * @param int          $src_y    The start y position to crop from.

 * @param int          $src_w    The width to crop.

 * @param int          $src_h    The height to crop.

 * @param int          $dst_w    The destination width.

 * @param int          $dst_h    The destination height.

 * @param bool|false   $src_abs  Optional. If the source crop points are absolute.

 * @param string|false $dst_file Optional. The destination file to write to.

 * @return string|WP_Error New filepath on success, WP_Error on failure.

 */

function wp_crop_image( $src, $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs = false, $dst_file = false ) {

	$src_file = $src;

	if ( is_numeric( $src ) ) { // Handle int as attachment ID.

		$src_file = get_attached_file( $src );

		if ( ! file_exists( $src_file ) ) {

			// If the file doesn't exist, attempt a URL fopen on the src link.

			// This can occur with certain file replication plugins.

			$src = _load_image_to_edit_path( $src, 'full' );

		} else {

			$src = $src_file;

		}

	}

	$editor = wp_get_image_editor( $src );

	if ( is_wp_error( $editor ) ) {

		return $editor;

	}

	$src = $editor->crop( $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs );

	if ( is_wp_error( $src ) ) {

		return $src;

	}

	if ( ! $dst_file ) {

		$dst_file = str_replace( wp_basename( $src_file ), 'cropped-' . wp_basename( $src_file ), $src_file );

	}

	/*

	 * The directory containing the original file may no longer exist when

	 * using a replication plugin.

	 */

	wp_mkdir_p( dirname( $dst_file ) );

	$dst_file = dirname( $dst_file ) . '/' . wp_unique_filename( dirname( $dst_file ), wp_basename( $dst_file ) );

	$result = $editor->save( $dst_file );

	if ( is_wp_error( $result ) ) {

		return $result;

	}

	return $dst_file;

}

/**

 * Compare the existing image sub-sizes (as saved in the attachment meta)

 * to the currently registered image sub-sizes, and return the difference.

 *

 * Registered sub-sizes that are larger than the image are skipped.

 *

 * @since 5.3.0

 *

 * @param int $attachment_id The image attachment post ID.

 */

function wp_get_missing_image_subsizes( $attachment_id ) {

	if ( ! wp_attachment_is_image( $attachment_id ) ) {

		return array();

	}

	$registered_sizes = wp_get_registered_image_subsizes();

	$image_meta       = wp_get_attachment_metadata( $attachment_id );

	// Meta error?

	if ( empty( $image_meta ) ) {

		return $registered_sizes;

	}

	// Use the originally uploaded image dimensions as full_width and full_height.

	if ( ! empty( $image_meta['original_image'] ) ) {

		$image_file = wp_get_original_image_path( $attachment_id );

		$imagesize  = wp_getimagesize( $image_file );

	}

	if ( ! empty( $imagesize ) ) {

		$full_width  = $imagesize[0];

		$full_height = $imagesize[1];

	} else {

		$full_width  = (int) $image_meta['width'];

		$full_height = (int) $image_meta['height'];

	}

	$possible_sizes = array();

	// Skip registered sizes that are too large for the uploaded image.

	foreach ( $registered_sizes as $size_name => $size_data ) {

		if ( image_resize_dimensions( $full_width, $full_height, $size_data['width'], $size_data['height'], $size_data['crop'] ) ) {

			$possible_sizes[ $size_name ] = $size_data;

		}

	}

	if ( empty( $image_meta['sizes'] ) ) {

		$image_meta['sizes'] = array();

	}

	/*

	 * Remove sizes that already exist. Only checks for matching "size names".

	 * It is possible that the dimensions for a particular size name have changed.

	 * For example the user has changed the values on the Settings -> Media screen.

	 * However we keep the old sub-sizes with the previous dimensions

	 * as the image may have been used in an older post.

	 */

	$missing_sizes = array_diff_key( $possible_sizes, $image_meta['sizes'] );

	/**

	 * Filters the array of missing image sub-sizes for an uploaded image.

	 *

	 * @since 5.3.0

	 *

	 */

	return apply_filters( 'wp_get_missing_image_subsizes', $missing_sizes, $image_meta, $attachment_id );

}

/**

 * If any of the currently registered image sub-sizes are missing,

 * create them and update the image meta data.

 *

 * @since 5.3.0

 *

 * @param int $attachment_id The image attachment post ID.

 * @return array|WP_Error The updated image meta data array or WP_Error object

 *                        if both the image meta and the attached file are missing.

 */

function wp_update_image_subsizes( $attachment_id ) {

	$image_meta = wp_get_attachment_metadata( $attachment_id );

	$image_file = wp_get_original_image_path( $attachment_id );

	if ( empty( $image_meta ) || ! is_array( $image_meta ) ) {

		// Previously failed upload?

		// If there is an uploaded file, make all sub-sizes and generate all of the attachment meta.

		if ( ! empty( $image_file ) ) {

			$image_meta = wp_create_image_subsizes( $image_file, $attachment_id );

		} else {

			return new WP_Error( 'invalid_attachment', __( 'The attached file cannot be found.' ) );

		}

	} else {

		$missing_sizes = wp_get_missing_image_subsizes( $attachment_id );

		if ( empty( $missing_sizes ) ) {

			return $image_meta;

		}

		// This also updates the image meta.

		$image_meta = _wp_make_subsizes( $missing_sizes, $image_file, $image_meta, $attachment_id );

	}

	/** This filter is documented in wp-admin/includes/image.php */

	$image_meta = apply_filters( 'wp_generate_attachment_metadata', $image_meta, $attachment_id, 'update' );

	// Save the updated metadata.

	wp_update_attachment_metadata( $attachment_id, $image_meta );

	return $image_meta;

}

/**

 * Updates the attached file and image meta data when the original image was edited.

 *

 * @since 5.3.0

 * @access private

 *

 * @param array  $saved_data    The data returned from WP_Image_Editor after successfully saving an image.

 * @param string $original_file Path to the original file.

 * @param array  $image_meta    The image meta data.

 * @param int    $attachment_id The attachment post ID.

 * @return array The updated image meta data.

 */

function _wp_image_meta_replace_original( $saved_data, $original_file, $image_meta, $attachment_id ) {

	$new_file = $saved_data['path'];

	// Update the attached file meta.

	update_attached_file( $attachment_id, $new_file );

	// Width and height of the new image.

	$image_meta['width']  = $saved_data['width'];

	$image_meta['height'] = $saved_data['height'];

	// Make the file path relative to the upload dir.

	$image_meta['file'] = _wp_relative_upload_path( $new_file );

	// Store the original image file name in image_meta.

	$image_meta['original_image'] = wp_basename( $original_file );

	return $image_meta;

}

/**

 * Creates image sub-sizes, adds the new data to the image meta `sizes` array, and updates the image metadata.

 *

 * Intended for use after an image is uploaded. Saves/updates the image metadata after each

 * sub-size is created. If there was an error, it is added to the returned image metadata array.

 *

 * @since 5.3.0

 *

 * @param string $file          Full path to the image file.

 * @return array The image attachment meta data.

 */

function wp_create_image_subsizes( $file, $attachment_id ) {

	$imagesize = wp_getimagesize( $file );

	if ( empty( $imagesize ) ) {

		// File is not an image.

		return array();

	}

	// Default image meta.

	$image_meta = array(

	);

	// Fetch additional metadata from EXIF/IPTC.

	$exif_meta = wp_read_image_metadata( $file );

	if ( $exif_meta ) {

		$image_meta['image_meta'] = $exif_meta;

	}

	// Do not scale (large) PNG images. May result in sub-sizes that have greater file size than the original. See #48736.

	if ( 'image/png' !== $imagesize['mime'] ) {

		/**

		 * Filters the "BIG image" threshold value.

		 *

		 * If the original image width or height is above the threshold, it will be scaled down. The threshold is

		 * used as max width and max height. The scaled down image will be used as the largest available size, including

		 * the `_wp_attached_file` post meta value.

		 *

		 * Returning `false` from the filter callback will disable the scaling.

		 *

		 * @since 5.3.0

		 *

		 * @param int    $threshold     The threshold value in pixels. Default 2560.

		 * @param array  $imagesize     {

		 *     Indexed array of the image width and height in pixels.

		 *

		 *     @type int $0 The image width.

		 *     @type int $1 The image height.

		 * }

		 * @param string $file          Full path to the uploaded image file.

		 * @param int    $attachment_id Attachment post ID.

		 */

		$threshold = (int) apply_filters( 'big_image_size_threshold', 2560, $imagesize, $file, $attachment_id );

		// If the original image's dimensions are over the threshold,

		// scale the image and use it as the "full" size.

		if ( $threshold && ( $image_meta['width'] > $threshold || $image_meta['height'] > $threshold ) ) {

			$editor = wp_get_image_editor( $file );

			if ( is_wp_error( $editor ) ) {

				// This image cannot be edited.

				return $image_meta;

			}

			// Resize the image.

			$resized = $editor->resize( $threshold, $threshold );

			$rotated = null;

			// If there is EXIF data, rotate according to EXIF Orientation.

			if ( ! is_wp_error( $resized ) && is_array( $exif_meta ) ) {

				$resized = $editor->maybe_exif_rotate();

				$rotated = $resized;

			}

			if ( ! is_wp_error( $resized ) ) {

				// Append "-scaled" to the image file name. It will look like "my_image-scaled.jpg".

				// This doesn't affect the sub-sizes names as they are generated from the original image (for best quality).

				$saved = $editor->save( $editor->generate_filename( 'scaled' ) );

				if ( ! is_wp_error( $saved ) ) {

					$image_meta = _wp_image_meta_replace_original( $saved, $file, $image_meta, $attachment_id );

					// If the image was rotated update the stored EXIF data.

					if ( true === $rotated && ! empty( $image_meta['image_meta']['orientation'] ) ) {

						$image_meta['image_meta']['orientation'] = 1;

					}

				} else {

					// TODO: Log errors.

				}

			} else {

				// TODO: Log errors.

			}

		} elseif ( ! empty( $exif_meta['orientation'] ) && 1 !== (int) $exif_meta['orientation'] ) {

			// Rotate the whole original image if there is EXIF data and "orientation" is not 1.

			$editor = wp_get_image_editor( $file );

			if ( is_wp_error( $editor ) ) {

				// This image cannot be edited.

				return $image_meta;

			}

			// Rotate the image.

			$rotated = $editor->maybe_exif_rotate();

			if ( true === $rotated ) {

				// Append `-rotated` to the image file name.

				$saved = $editor->save( $editor->generate_filename( 'rotated' ) );

				if ( ! is_wp_error( $saved ) ) {

					$image_meta = _wp_image_meta_replace_original( $saved, $file, $image_meta, $attachment_id );

					// Update the stored EXIF data.

					if ( ! empty( $image_meta['image_meta']['orientation'] ) ) {

						$image_meta['image_meta']['orientation'] = 1;

					}

				} else {

					// TODO: Log errors.

				}

			}

		}

	}

	/*

	 * Initial save of the new metadata.

	 * At this point the file was uploaded and moved to the uploads directory

	 * but the image sub-sizes haven't been created yet and the `sizes` array is empty.

	 */

	wp_update_attachment_metadata( $attachment_id, $image_meta );

	$new_sizes = wp_get_registered_image_subsizes();

	/**

	 * Filters the image sizes automatically generated when uploading an image.

	 *

	 * @since 2.9.0

	 * @since 4.4.0 Added the `$image_meta` argument.

	 * @since 5.3.0 Added the `$attachment_id` argument.

	 *

	 * @param array $new_sizes     Associative array of image sizes to be created.

	 * @param array $image_meta    The image meta data: width, height, file, sizes, etc.

	 * @param int   $attachment_id The attachment post ID for the image.

	 */

	$new_sizes = apply_filters( 'intermediate_image_sizes_advanced', $new_sizes, $image_meta, $attachment_id );

	return _wp_make_subsizes( $new_sizes, $file, $image_meta, $attachment_id );

}

/**

 * Low-level function to create image sub-sizes.

 *

 * Updates the image meta after each sub-size is created.

 * Errors are stored in the returned image metadata array.

 *

 * @since 5.3.0

 * @access private

 *

 * @param array  $new_sizes     Array defining what sizes to create.

 * @param string $file          Full path to the image file.

 * @param array  $image_meta    The attachment meta data array.

 * @return array The attachment meta data with updated `sizes` array. Includes an array of errors encountered while resizing.

 */

function _wp_make_subsizes( $new_sizes, $file, $image_meta, $attachment_id ) {

	if ( empty( $image_meta ) || ! is_array( $image_meta ) ) {

		// Not an image attachment.

		return array();

	}

	// Check if any of the new sizes already exist.

	if ( isset( $image_meta['sizes'] ) && is_array( $image_meta['sizes'] ) ) {

		foreach ( $image_meta['sizes'] as $size_name => $size_meta ) {

			/*

			 * Only checks "size name" so we don't override existing images even if the dimensions

			 * don't match the currently defined size with the same name.

			 * To change the behavior, unset changed/mismatched sizes in the `sizes` array in image meta.

			 */

			if ( array_key_exists( $size_name, $new_sizes ) ) {

				unset( $new_sizes[ $size_name ] );

			}

		}

	} else {

		$image_meta['sizes'] = array();

	}