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EDIT :: class-wp-image-editor.php

<?php
/**
 * Base WordPress Image Editor
 *
 * @package WordPress
 * @subpackage Image_Editor
 */

/**
 * Base image editor class from which implementations extend
 *
 * @since 3.5.0
 */
#[AllowDynamicProperties]
abstract class WP_Image_Editor {
	protected $file              = null;
	protected $size              = null;
	protected $mime_type         = null;
	protected $output_mime_type  = null;
	protected $default_mime_type = 'image/jpeg';
	protected $quality           = false;

// Deprecated since 5.8.1. See get_default_quality() below.
	protected $default_quality = 82;

/**
	 * Each instance handles a single file.
	 *
	 * @param string $file Path to the file to load.
	 */
	public function __construct( $file ) {
		$this->file = $file;
	}

/**
	 * Checks to see if current environment supports the editor chosen.
	 * Must be overridden in a subclass.
	 *
	 * @since 3.5.0
	 *
	 * @abstract
	 *
	 * @param array $args
	 * @return bool
	 */
	public static function test( $args = array() ) {
		return false;
	}

/**
	 * Checks to see if editor supports the mime-type specified.
	 * Must be overridden in a subclass.
	 *
	 * @since 3.5.0
	 *
	 * @abstract
	 *
	 * @param string $mime_type
	 * @return bool
	 */
	public static function supports_mime_type( $mime_type ) {
		return false;
	}

/**
	 * Loads image from $this->file into editor.
	 *
	 * @since 3.5.0
	 * @abstract
	 *
	 * @return true|WP_Error True if loaded; WP_Error on failure.
	 */
	abstract public function load();

/**
	 * Saves current image to file.
	 *
	 * @since 3.5.0
	 * @since 6.0.0 The `$filesize` value was added to the returned array.
	 * @abstract
	 *
	 * @param string $destfilename Optional. Destination filename. Default null.
	 * @param string $mime_type    Optional. The mime-type. Default null.
	 * @return array|WP_Error {
	 *     Array on success or WP_Error if the file failed to save.
	 *
	 *     @type string $path      Path to the image file.
	 *     @type string $file      Name of the image file.
	 *     @type int    $width     Image width.
	 *     @type int    $height    Image height.
	 *     @type string $mime-type The mime type of the image.
	 *     @type int    $filesize  File size of the image.
	 * }
	 */
	abstract public function save( $destfilename = null, $mime_type = null );

/**
	 * Resizes current image.
	 *
	 * At minimum, either a height or width must be provided.
	 * If one of the two is set to null, the resize will
	 * maintain aspect ratio according to the provided dimension.
	 *
	 * @since 3.5.0
	 * @abstract
	 *
	 * @param int|null   $max_w Image width.
	 * @param int|null   $max_h Image height.
	 * @param bool|array $crop  {
	 *     Optional. Image cropping behavior. If false, the image will be scaled (default).
	 *     If true, image will be cropped to the specified dimensions using center positions.
	 *     If an array, the image will be cropped using the array to specify the crop location:
	 *
	 *     @type string $0 The x crop position. Accepts 'left', 'center', or 'right'.
	 *     @type string $1 The y crop position. Accepts 'top', 'center', or 'bottom'.
	 * }
	 * @return true|WP_Error
	 */
	abstract public function resize( $max_w, $max_h, $crop = false );

/**
	 * Resize multiple images from a single source.
	 *
	 * @since 3.5.0
	 * @abstract
	 *
	 * @param array $sizes {
	 *     An array of image size arrays. Default sizes are 'small', 'medium', 'large'.
	 *
	 *     @type array ...$0 {
	 *         @type int        $width  Image width.
	 *         @type int        $height Image height.
	 *         @type bool|array $crop   Optional. Whether to crop the image. Default false.
	 *     }
	 * }
	 * @return array An array of resized images metadata by size.
	 */
	abstract public function multi_resize( $sizes );

/**
	 * Crops Image.
	 *
	 * @since 3.5.0
	 * @abstract
	 *
	 * @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   Optional. The destination width.
	 * @param int  $dst_h   Optional. The destination height.
	 * @param bool $src_abs Optional. If the source crop points are absolute.
	 * @return true|WP_Error
	 */
	abstract public function crop( $src_x, $src_y, $src_w, $src_h, $dst_w = null, $dst_h = null, $src_abs = false );

/**
	 * Rotates current image counter-clockwise by $angle.
	 *
	 * @since 3.5.0
	 * @abstract
	 *
	 * @param float $angle
	 * @return true|WP_Error
	 */
	abstract public function rotate( $angle );

/**
	 * Flips current image.
	 *
	 * @since 3.5.0
	 * @abstract
	 *
	 * @param bool $horz Flip along Horizontal Axis
	 * @param bool $vert Flip along Vertical Axis
	 * @return true|WP_Error
	 */
	abstract public function flip( $horz, $vert );

/**
	 * Streams current image to browser.
	 *
	 * @since 3.5.0
	 * @abstract
	 *
	 * @param string $mime_type The mime type of the image.
	 * @return true|WP_Error True on success, WP_Error object on failure.
	 */
	abstract public function stream( $mime_type = null );

/**
	 * Gets dimensions of image.
	 *
	 * @since 3.5.0
	 *
	 * @return int[] {
	 *     Dimensions of the image.
	 *
	 *     @type int $width  The image width.
	 *     @type int $height The image height.
	 * }
	 */
	public function get_size() {
		return $this->size;
	}

/**
	 * Sets current image size.
	 *
	 * @since 3.5.0
	 *
	 * @param int $width
	 * @param int $height
	 * @return true
	 */
	protected function update_size( $width = null, $height = null ) {
		$this->size = array(
			'width'  => (int) $width,
			'height' => (int) $height,
		);
		return true;
	}

/**
	 * Gets the Image Compression quality on a 1-100% scale.
	 *
	 * @since 4.0.0
	 *
	 * @return int Compression Quality. Range: [1,100]
	 */
	public function get_quality() {
		if ( ! $this->quality ) {
			$this->set_quality();
		}

return $this->quality;
	}

/**
	 * Sets Image Compression quality on a 1-100% scale.
	 *
	 * @since 3.5.0
	 * @since 6.8.0 The `$dims` parameter was added.
	 *
	 * @param int   $quality Compression Quality. Range: [1,100]
	 * @param array $dims    Optional. Image dimensions array with 'width' and 'height' keys.
	 * @return true|WP_Error True if set successfully; WP_Error on failure.

*/
	public function set_quality( $quality = null, $dims = array() ) {
		// Use the output mime type if present. If not, fall back to the input/initial mime type.
		$mime_type = ! empty( $this->output_mime_type ) ? $this->output_mime_type : $this->mime_type;
		// Get the default quality setting for the mime type.
		$default_quality = $this->get_default_quality( $mime_type );

if ( null === $quality ) {
			/**
			 * Filters the default image compression quality setting.
			 *
			 * Applies only during initial editor instantiation, or when set_quality() is run
			 * manually without the `$quality` argument.
			 *
			 * The WP_Image_Editor::set_quality() method has priority over the filter.
			 *
			 * @since 3.5.0
			 * @since 6.8.0 Added the size parameter.
			 *
			 * @param int    $quality   Quality level between 1 (low) and 100 (high).
			 * @param string $mime_type Image mime type.
			 * @param array $size {
			 *     Dimensions of the image.
			 *
			 *     @type int $width  The image width.
			 *     @type int $height The image height.
			 * }
			 */
			$quality = apply_filters( 'wp_editor_set_quality', $default_quality, $mime_type, $dims ? $dims : $this->size );

if ( 'image/jpeg' === $mime_type ) {
				/**
				 * Filters the JPEG compression quality for backward-compatibility.
				 *
				 * Applies only during initial editor instantiation, or when set_quality() is run
				 * manually without the `$quality` argument.
				 *
				 * The WP_Image_Editor::set_quality() method has priority over the filter.
				 *
				 * The filter is evaluated under two contexts: 'image_resize', and 'edit_image',
				 * (when a JPEG image is saved to file).
				 *
				 * @since 2.5.0
				 *
				 * @param int    $quality Quality level between 0 (low) and 100 (high) of the JPEG.
				 * @param string $context Context of the filter.
				 */
				$quality = apply_filters( 'jpeg_quality', $quality, 'image_resize' );
			}

if ( $quality < 0 || $quality > 100 ) {
				$quality = $default_quality;
			}
		}

// Allow 0, but squash to 1 due to identical images in GD, and for backward compatibility.
		if ( 0 === $quality ) {
			$quality = 1;
		}

if ( ( $quality >= 1 ) && ( $quality <= 100 ) ) {
			$this->quality = $quality;
			return true;
		} else {
			return new WP_Error( 'invalid_image_quality', __( 'Attempted to set image quality outside of the range [1,100].' ) );
		}
	}

/**
	 * Returns the default compression quality setting for the mime type.
	 *
	 * @since 5.8.1
	 *
	 * @param string $mime_type
	 * @return int The default quality setting for the mime type.
	 */
	protected function get_default_quality( $mime_type ) {
		switch ( $mime_type ) {
			case 'image/webp':
				$quality = 86;
				break;
			case 'image/jpeg':
			default:
				$quality = $this->default_quality;
		}

return $quality;
	}

/**
	 * Returns preferred mime-type and extension based on provided
	 * file's extension and mime, or current file's extension and mime.
	 *
	 * Will default to $this->default_mime_type if requested is not supported.
	 *
	 * Provides corrected filename only if filename is provided.
	 *
	 * @since 3.5.0
	 *
	 * @param string $filename
	 * @param string $mime_type
	 * @return array { filename|null, extension, mime-type }
	 */
	protected function get_output_format( $filename = null, $mime_type = null ) {
		$new_ext = null;

// By default, assume specified type takes priority.
		if ( $mime_type ) {
			$new_ext = $this->get_extension( $mime_type );
		}

if ( $filename ) {
			$file_ext  = strtolower( pathinfo( $filename, PATHINFO_EXTENSION ) );
			$file_mime = $this->get_mime_type( $file_ext );
		} else {
			// If no file specified, grab editor's current extension and mime-type.
			$file_ext  = strtolower( pathinfo( $this->file, PATHINFO_EXTENSION ) );
			$file_mime = $this->mime_type;
		}

/*
		 * Check to see if specified mime-type is the same as type implied by
		 * file extension. If so, prefer extension from file.
		 */
		if ( ! $mime_type || ( $file_mime === $mime_type ) ) {
			$mime_type = $file_mime;
			$new_ext   = $file_ext;
		}

$output_format = wp_get_image_editor_output_format( $filename, $mime_type );

if ( isset( $output_format[ $mime_type ] )
			&& $this->supports_mime_type( $output_format[ $mime_type ] )
		) {
			$mime_type = $output_format[ $mime_type ];
			$new_ext   = $this->get_extension( $mime_type );
		}

/*
		 * Double-check that the mime-type selected is supported by the editor.
		 * If not, choose a default instead.
		 */
		if ( ! $this->supports_mime_type( $mime_type ) ) {
			/**
			 * Filters default mime type prior to getting the file extension.
			 *
			 * @see wp_get_mime_types()
			 *
			 * @since 3.5.0
			 *
			 * @param string $mime_type Mime type string.
			 */
			$mime_type = apply_filters( 'image_editor_default_mime_type', $this->default_mime_type );
			$new_ext   = $this->get_extension( $mime_type );
		}

/*
		 * Ensure both $filename and $new_ext are not empty.
		 * $this->get_extension() returns false on error which would effectively remove the extension
		 * from $filename. That shouldn't happen, files without extensions are not supported.
		 */
		if ( $filename && $new_ext ) {
			$dir = pathinfo( $filename, PATHINFO_DIRNAME );
			$ext = pathinfo( $filename, PATHINFO_EXTENSION );

$filename = trailingslashit( $dir ) . wp_basename( $filename, ".$ext" ) . ".{$new_ext}";
		}

if ( $mime_type && ( $mime_type !== $this->mime_type ) ) {
			// The image will be converted when saving. Set the quality for the new mime-type if not already set.
			if ( $mime_type !== $this->output_mime_type ) {
				$this->output_mime_type = $mime_type;
			}
			$this->set_quality();
		} elseif ( ! empty( $this->output_mime_type ) ) {
			// Reset output_mime_type and quality.
			$this->output_mime_type = null;
			$this->set_quality();
		}

return array( $filename, $new_ext, $mime_type );
	}

/**
	 * Builds an output filename based on current file, and adding proper suffix
	 *
	 * @since 3.5.0
	 * @since 6.8.0 Passing an empty string as $suffix will now omit the suffix from the generated filename.
	 *
	 * @param string $suffix
	 * @param string $dest_path
	 * @param string $extension
	 * @return string filename
	 */
	public function generate_filename( $suffix = null, $dest_path = null, $extension = null ) {
		// If not empty the $suffix will be appended to the destination filename, just before the extension.
		if ( $suffix ) {
			$suffix = '-' . $suffix;
		} elseif ( '' !== $suffix ) {
			$suffix = '-' . $this->get_suffix();
		}

$dir = pathinfo( $this->file, PATHINFO_DIRNAME );
		$ext = pathinfo( $this->file, PATHINFO_EXTENSION );

$name    = wp_basename( $this->file, ".$ext" );
		$new_ext = strtolower( $extension ? $extension : $ext );

if ( ! is_null( $dest_path ) ) {
			if ( ! wp_is_stream( $dest_path ) ) {
				$_dest_path = realpath( $dest_path );
				if ( $_dest_path ) {
					$dir = $_dest_path;
				}
			} else {
				$dir = $dest_path;
			}
		}

return trailingslashit( $dir ) . "{$name}{$suffix}.{$new_ext}";
	}

/**
	 * Builds and returns proper suffix for file based on height and width.
	 *
	 * @since 3.5.0
	 *
	 * @return string|false suffix
	 */
	public function get_suffix() {
		if ( ! $this->get_size() ) {
			return false;
		}

return "{$this->size['width']}x{$this->size['height']}";
	}

/**
	 * Check if a JPEG image has EXIF Orientation tag and rotate it if needed.
	 *
	 * @since 5.3.0
	 *
	 * @return bool|WP_Error True if the image was rotated. False if not rotated (no EXIF data or the image doesn't need to be rotated).
	 *                       WP_Error if error while rotating.
	 */
	public function maybe_exif_rotate() {
		$orientation = null;

if ( is_callable( 'exif_read_data' ) && 'image/jpeg' === $this->mime_type ) {
			$exif_data = @exif_read_data( $this->file );

if ( ! empty( $exif_data['Orientation'] ) ) {
				$orientation = (int) $exif_data['Orientation'];
			}
		}

/**
		 * Filters the `$orientation` value to correct it before rotating or to prevent rotating the image.
		 *
		 * @since 5.3.0
		 *
		 * @param int    $orientation EXIF Orientation value as retrieved from the image file.
		 * @param string $file        Path to the image file.
		 */
		$orientation = apply_filters( 'wp_image_maybe_exif_rotate', $orientation, $this->file );

if ( ! $orientation || 1 === $orientation ) {
			return false;
		}

switch ( $orientation ) {
			case 2:
				// Flip horizontally.
				$result = $this->flip( false, true );
				break;
			case 3:
				/*
				 * Rotate 180 degrees or flip horizontally and vertically.
				 * Flipping seems faster and uses less resources.
				 */
				$result = $this->flip( true, true );
				break;
			case 4:
				// Flip vertically.
				$result = $this->flip( true, false );
				break;
			case 5:
				// Rotate 90 degrees counter-clockwise and flip vertically.
				$result = $this->rotate( 90 );

if ( ! is_wp_error( $result ) ) {
					$result = $this->flip( true, false );
				}

break;
			case 6:
				// Rotate 90 degrees clockwise (270 counter-clockwise).
				$result = $this->rotate( 270 );
				break;
			case 7:
				// Rotate 90 degrees counter-clockwise and flip horizontally.
				$result = $this->rotate( 90 );

if ( ! is_wp_error( $result ) ) {
					$result = $this->flip( false, true );
				}

break;
			case 8:
				// Rotate 90 degrees counter-clockwise.
				$result = $this->rotate( 90 );
				break;
		}

return $result;
	}

/**
	 * Either calls editor's save function or handles file as a stream.
	 *
	 * @since 3.5.0
	 *
	 * @param string   $filename
	 * @param callable $callback
	 * @param array    $arguments
	 * @return bool
	 */
	protected function make_image( $filename, $callback, $arguments ) {
		$stream = wp_is_stream( $filename );
		if ( $stream ) {
			ob_start();
		} else {
			// The directory containing the original file may no longer exist when using a replication plugin.
			wp_mkdir_p( dirname( $filename ) );
		}

$result = call_user_func_array( $callback, $arguments );

if ( $result && $stream ) {
			$contents = ob_get_contents();

$fp = fopen( $filename, 'w' );

if ( ! $fp ) {
				ob_end_clean();
				return false;
			}

fwrite( $fp, $contents );
			fclose( $fp );
		}

if ( $stream ) {
			ob_end_clean();
		}

return $result;
	}

/**
	 * Returns first matched mime-type from extension,
	 * as mapped from wp_get_mime_types()
	 *
	 * @since 3.5.0
	 *
	 * @param string $extension
	 * @return string|false
	 */
	protected static function get_mime_type( $extension = null ) {
		if ( ! $extension ) {
			return false;
		}

$mime_types = wp_get_mime_types();
		$extensions = array_keys( $mime_types );

foreach ( $extensions as $_extension ) {
			if ( preg_match( "/{$extension}/i", $_extension ) ) {
				return $mime_types[ $_extension ];
			}
		}

return false;
	}

/**
	 * Returns first matched extension from Mime-type,
	 * as mapped from wp_get_mime_types()
	 *
	 * @since 3.5.0
	 *
	 * @param string $mime_type
	 * @return string|false
	 */
	protected static function get_extension( $mime_type = null ) {
		if ( empty( $mime_type ) ) {
			return false;
		}

return wp_get_default_extension_for_mime_type( $mime_type );
	}
}

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EDIT :: class-wp-image-editor.php