WordPress/wp-includes/class-wp-image-editor.php
2012-11-09 20:10:33 +00:00

362 lines
9.0 KiB
PHP

<?php
/**
* Base WordPress Image Editor
*
* @package WordPress
* @subpackage Image_Editor
*/
/**
* Base WordPress Image Editor class for which Editor implementations extend
*
* @since 3.5.0
*/
abstract class WP_Image_Editor {
protected $file = null;
protected $size = null;
protected $mime_type = null;
protected $default_mime_type = 'image/jpeg';
protected $quality = 90;
protected function __construct( $filename ) {
$this->file = $filename;
}
/**
* Returns a WP_Image_Editor instance and loads file into it.
*
* @since 3.5.0
* @access public
*
* @param string $path Path to File to Load
* @param array $required_methods Methods to require in implementation
* @return WP_Image_Editor|WP_Error
*/
public final static function get_instance( $path = null, $required_methods = null ) {
$implementation = apply_filters( 'wp_image_editor_class', self::choose_implementation( $required_methods ), $path );
if ( $implementation ) {
$editor = new $implementation( $path );
$loaded = $editor->load();
if ( is_wp_error( $loaded ) )
return $loaded;
return $editor;
}
return new WP_Error( 'no_editor', __('No editor could be selected') );
}
/**
* Tests which editors are capable of supporting the request.
*
* @since 3.5.0
* @access private
*
* @param array $required_methods String array of all methods required for implementation returned.
* @return string|bool Class name for the first editor that claims to support the request. False if no editor claims to support the request.
*/
private final static function choose_implementation( $required_methods = null ) {
$request_order = apply_filters( 'wp_image_editors',
array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) );
if ( ! $required_methods )
$required_methods = apply_filters( 'wp_image_editor_default_methods',
array( 'resize', 'multi_resize', 'crop', 'rotate', 'flip', 'stream' ) );
// Loop over each editor on each request looking for one which will serve this request's needs
foreach ( $request_order as $editor ) {
// Check to see if this editor is a possibility, calls the editor statically
if ( ! call_user_func( array( $editor, 'test' ) ) )
continue;
// Make sure that all methods are supported by editor.
if ( array_diff( $required_methods, get_class_methods( $editor ) ) )
continue;
return $editor;
}
return false;
}
abstract protected function load(); // returns bool|WP_Error
abstract public function save( $destfilename = null, $mime_type = null );
/**
* Implement all of the below to support natively used functions:
*
* public function resize( $max_w, $max_h, $crop = false )
* public function multi_resize( $sizes )
* public function crop( $src_x, $src_y, $src_w, $src_h, $dst_w = null, $dst_h = null, $src_abs = false )
* public function rotate( $angle )
* public function flip( $horz, $vert )
* public function stream( $mime_type = null )
*/
/**
* Checks to see if current environment supports the editor chosen.
* Must be overridden in a sub-class.
*
* @since 3.5.0
* @access public
* @abstract
*
* @param array $args
* @return boolean
*/
public static function test( $args = null ) {
return false;
}
/**
* Checks to see if editor supports mime-type specified
* Must be overridden in a sub-class.
*
* @since 3.5.0
* @access public
* @abstract
*
* @param string $mime_type
* @return boolean
*/
public static function supports_mime_type( $mime_type ) {
return false;
}
/**
* Gets dimensions of image
*
* @since 3.5.0
* @access public
*
* @return array {'width'=>int, 'height'=>int}
*/
public function get_size() {
return $this->size;
}
/**
* Sets current image size
*
* @since 3.5.0
* @access protected
*
* @param int $width
* @param int $height
*/
protected function update_size( $width = null, $height = null ) {
$this->size = array(
'width' => $width,
'height' => $height
);
return true;
}
/**
* Sets Image Compression quality on a 1-100% scale.
*
* @since 3.5.0
* @access public
*
* @param int $quality Compression Quality. Range: [1,100]
* @return boolean
*/
public function set_quality( $quality ) {
$this->quality = apply_filters( 'wp_editor_set_quality', $quality );
return ( (bool) $this->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
* @access protected
*
* @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 = $file_ext = null;
$file_mime = 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;
}
// 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 ) ) {
$mime_type = apply_filters( 'image_editor_default_mime_type', $this->default_mime_type );
$new_ext = $this->get_extension( $mime_type );
}
if ( $filename ) {
$ext = '';
$info = pathinfo( $filename );
$dir = $info['dirname'];
if( isset( $info['extension'] ) )
$ext = $info['extension'];
$filename = trailingslashit( $dir ) . wp_basename( $filename, ".$ext" ) . ".{$new_ext}";
}
return array( $filename, $new_ext, $mime_type );
}
/**
* Builds an output filename based on current file, and adding proper suffix
*
* @since 3.5.0
* @access public
*
* @param string $suffix
* @param string $dest_path
* @param string $extension
* @return string filename
*/
public function generate_filename( $suffix = null, $dest_path = null, $extension = null ) {
// $suffix will be appended to the destination filename, just before the extension
if ( ! $suffix )
$suffix = $this->get_suffix();
$info = pathinfo( $this->file );
$dir = $info['dirname'];
$ext = $info['extension'];
$name = wp_basename( $this->file, ".$ext" );
$new_ext = strtolower( $extension ? $extension : $ext );
if ( ! is_null( $dest_path ) && $_dest_path = realpath( $dest_path ) )
$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
* @access public
*
* @return string suffix
*/
public function get_suffix() {
if ( ! $this->get_size() )
return false;
return "{$this->size['width']}x{$this->size['height']}";
}
/**
* Either calls editor's save function or handles file as a stream.
*
* @since 3.5.0
* @access protected
*
* @param string|stream $filename
* @param callable $function
* @param array $arguments
* @return boolean
*/
protected function make_image( $filename, $function, $arguments ) {
$dst_file = $filename;
if ( $stream = wp_is_stream( $filename ) ) {
$filename = null;
ob_start();
}
$result = call_user_func_array( $function, $arguments );
if ( $result && $stream ) {
$contents = ob_get_contents();
$fp = fopen( $dst_file, 'w' );
if ( ! $fp )
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
* @access protected
*
* @param string $extension
* @return string|boolean
*/
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
* @access protected
*
* @param string $mime_type
* @return string|boolean
*/
protected static function get_extension( $mime_type = null ) {
$extensions = explode( '|', array_search( $mime_type, wp_get_mime_types() ) );
if ( empty( $extensions[0] ) )
return false;
return $extensions[0];
}
}