488 lines
13 KiB
PHP
488 lines
13 KiB
PHP
<?php
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/**
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* WordPress GD Image Editor
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*
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* @package WordPress
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* @subpackage Image_Editor
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*/
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/**
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* WordPress Image Editor Class for Image Manipulation through GD
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*
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* @since 3.5.0
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* @package WordPress
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* @subpackage Image_Editor
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* @uses WP_Image_Editor Extends class
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*/
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class WP_Image_Editor_GD extends WP_Image_Editor {
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/**
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* GD Resource.
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*
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* @access protected
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* @var resource
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*/
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protected $image;
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public function __destruct() {
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if ( $this->image ) {
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// we don't need the original in memory anymore
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imagedestroy( $this->image );
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}
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}
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/**
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* Checks to see if current environment supports GD.
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*
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* @since 3.5.0
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*
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* @static
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* @access public
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*
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* @param array $args
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* @return bool
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*/
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public static function test( $args = array() ) {
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if ( ! extension_loaded('gd') || ! function_exists('gd_info') )
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return false;
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// On some setups GD library does not provide imagerotate() - Ticket #11536
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if ( isset( $args['methods'] ) &&
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in_array( 'rotate', $args['methods'] ) &&
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! function_exists('imagerotate') ){
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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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* Checks to see if editor supports the mime-type specified.
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*
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* @since 3.5.0
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*
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* @static
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* @access public
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*
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* @param string $mime_type
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* @return bool
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*/
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public static function supports_mime_type( $mime_type ) {
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$image_types = imagetypes();
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switch( $mime_type ) {
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case 'image/jpeg':
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return ($image_types & IMG_JPG) != 0;
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case 'image/png':
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return ($image_types & IMG_PNG) != 0;
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case 'image/gif':
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return ($image_types & IMG_GIF) != 0;
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}
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return false;
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}
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/**
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* Loads image from $this->file into new GD Resource.
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*
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* @since 3.5.0
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* @access protected
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*
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* @return bool|WP_Error True if loaded successfully; WP_Error on failure.
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*/
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public function load() {
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if ( $this->image )
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return true;
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if ( ! is_file( $this->file ) && ! preg_match( '|^https?://|', $this->file ) )
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return new WP_Error( 'error_loading_image', __('File doesn’t exist?'), $this->file );
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/**
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* Filter the memory limit allocated for image manipulation.
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*
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* @since 3.5.0
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*
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* @param int|string $limit Maximum memory limit to allocate for images. Default WP_MAX_MEMORY_LIMIT.
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* Accepts an integer (bytes), or a shorthand string notation, such as '256M'.
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*/
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// Set artificially high because GD uses uncompressed images in memory
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@ini_set( 'memory_limit', apply_filters( 'image_memory_limit', WP_MAX_MEMORY_LIMIT ) );
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$this->image = @imagecreatefromstring( file_get_contents( $this->file ) );
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if ( ! is_resource( $this->image ) )
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return new WP_Error( 'invalid_image', __('File is not an image.'), $this->file );
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$size = @getimagesize( $this->file );
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if ( ! $size )
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return new WP_Error( 'invalid_image', __('Could not read image size.'), $this->file );
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if ( function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' ) ) {
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imagealphablending( $this->image, false );
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imagesavealpha( $this->image, true );
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}
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$this->update_size( $size[0], $size[1] );
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$this->mime_type = $size['mime'];
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return $this->set_quality();
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}
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/**
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* Sets or updates current image size.
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*
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* @since 3.5.0
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* @access protected
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*
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* @param int $width
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* @param int $height
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* @return true
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*/
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protected function update_size( $width = false, $height = false ) {
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if ( ! $width )
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$width = imagesx( $this->image );
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if ( ! $height )
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$height = imagesy( $this->image );
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return parent::update_size( $width, $height );
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}
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/**
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* Resizes current image.
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* Wraps _resize, since _resize returns a GD Resource.
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*
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* At minimum, either a height or width must be provided.
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* If one of the two is set to null, the resize will
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* maintain aspect ratio according to the provided dimension.
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*
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* @since 3.5.0
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* @access public
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*
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* @param int|null $max_w Image width.
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* @param int|null $max_h Image height.
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* @param bool $crop
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* @return true|WP_Error
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*/
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public function resize( $max_w, $max_h, $crop = false ) {
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if ( ( $this->size['width'] == $max_w ) && ( $this->size['height'] == $max_h ) )
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return true;
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$resized = $this->_resize( $max_w, $max_h, $crop );
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if ( is_resource( $resized ) ) {
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imagedestroy( $this->image );
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$this->image = $resized;
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return true;
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} elseif ( is_wp_error( $resized ) )
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return $resized;
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return new WP_Error( 'image_resize_error', __('Image resize failed.'), $this->file );
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}
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/**
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*
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* @param int $max_w
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* @param int $max_h
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* @param bool|array $crop
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* @return resource|WP_Error
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*/
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protected function _resize( $max_w, $max_h, $crop = false ) {
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$dims = image_resize_dimensions( $this->size['width'], $this->size['height'], $max_w, $max_h, $crop );
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if ( ! $dims ) {
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return new WP_Error( 'error_getting_dimensions', __('Could not calculate resized image dimensions'), $this->file );
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}
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list( $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h ) = $dims;
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$resized = wp_imagecreatetruecolor( $dst_w, $dst_h );
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imagecopyresampled( $resized, $this->image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
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if ( is_resource( $resized ) ) {
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$this->update_size( $dst_w, $dst_h );
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return $resized;
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}
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return new WP_Error( 'image_resize_error', __('Image resize failed.'), $this->file );
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}
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/**
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* Resize multiple images from a single source.
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*
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* @since 3.5.0
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* @access public
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*
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* @param array $sizes {
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* An array of image size arrays. Default sizes are 'small', 'medium', 'large'.
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*
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* Either a height or width must be provided.
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* If one of the two is set to null, the resize will
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* maintain aspect ratio according to the provided dimension.
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*
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* @type array $size {
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* @type int ['width'] Optional. Image width.
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* @type int ['height'] Optional. Image height.
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* @type bool ['crop'] Optional. Whether to crop the image. Default false.
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* }
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* }
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* @return array An array of resized images' metadata by size.
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*/
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public function multi_resize( $sizes ) {
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$metadata = array();
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$orig_size = $this->size;
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foreach ( $sizes as $size => $size_data ) {
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if ( ! isset( $size_data['width'] ) && ! isset( $size_data['height'] ) ) {
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continue;
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}
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if ( ! isset( $size_data['width'] ) ) {
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$size_data['width'] = null;
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}
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if ( ! isset( $size_data['height'] ) ) {
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$size_data['height'] = null;
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}
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if ( ! isset( $size_data['crop'] ) ) {
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$size_data['crop'] = false;
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}
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$image = $this->_resize( $size_data['width'], $size_data['height'], $size_data['crop'] );
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$duplicate = ( ( $orig_size['width'] == $size_data['width'] ) && ( $orig_size['height'] == $size_data['height'] ) );
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if ( ! is_wp_error( $image ) && ! $duplicate ) {
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$resized = $this->_save( $image );
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imagedestroy( $image );
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if ( ! is_wp_error( $resized ) && $resized ) {
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unset( $resized['path'] );
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$metadata[$size] = $resized;
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}
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}
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$this->size = $orig_size;
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}
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return $metadata;
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}
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/**
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* Crops Image.
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*
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* @since 3.5.0
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* @access public
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*
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* @param int $src_x The start x position to crop from.
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* @param int $src_y The start y position to crop from.
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* @param int $src_w The width to crop.
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* @param int $src_h The height to crop.
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* @param int $dst_w Optional. The destination width.
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* @param int $dst_h Optional. The destination height.
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* @param bool $src_abs Optional. If the source crop points are absolute.
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* @return bool|WP_Error
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*/
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public function crop( $src_x, $src_y, $src_w, $src_h, $dst_w = null, $dst_h = null, $src_abs = false ) {
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// If destination width/height isn't specified, use same as
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// width/height from source.
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if ( ! $dst_w )
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$dst_w = $src_w;
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if ( ! $dst_h )
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$dst_h = $src_h;
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$dst = wp_imagecreatetruecolor( $dst_w, $dst_h );
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if ( $src_abs ) {
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$src_w -= $src_x;
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$src_h -= $src_y;
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}
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if ( function_exists( 'imageantialias' ) )
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imageantialias( $dst, true );
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imagecopyresampled( $dst, $this->image, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
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if ( is_resource( $dst ) ) {
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imagedestroy( $this->image );
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$this->image = $dst;
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$this->update_size();
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return true;
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}
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return new WP_Error( 'image_crop_error', __('Image crop failed.'), $this->file );
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}
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/**
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* Rotates current image counter-clockwise by $angle.
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* Ported from image-edit.php
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*
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* @since 3.5.0
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* @access public
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*
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* @param float $angle
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* @return true|WP_Error
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*/
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public function rotate( $angle ) {
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if ( function_exists('imagerotate') ) {
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$transparency = imagecolorallocatealpha( $this->image, 255, 255, 255, 127 );
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$rotated = imagerotate( $this->image, $angle, $transparency );
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if ( is_resource( $rotated ) ) {
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imagealphablending( $rotated, true );
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imagesavealpha( $rotated, true );
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imagedestroy( $this->image );
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$this->image = $rotated;
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$this->update_size();
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return true;
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}
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}
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return new WP_Error( 'image_rotate_error', __('Image rotate failed.'), $this->file );
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}
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/**
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* Flips current image.
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*
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* @since 3.5.0
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* @access public
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*
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* @param bool $horz Flip along Horizontal Axis
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* @param bool $vert Flip along Vertical Axis
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* @returns true|WP_Error
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*/
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public function flip( $horz, $vert ) {
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$w = $this->size['width'];
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$h = $this->size['height'];
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$dst = wp_imagecreatetruecolor( $w, $h );
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if ( is_resource( $dst ) ) {
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$sx = $vert ? ($w - 1) : 0;
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$sy = $horz ? ($h - 1) : 0;
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$sw = $vert ? -$w : $w;
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$sh = $horz ? -$h : $h;
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if ( imagecopyresampled( $dst, $this->image, 0, 0, $sx, $sy, $w, $h, $sw, $sh ) ) {
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imagedestroy( $this->image );
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$this->image = $dst;
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return true;
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}
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}
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return new WP_Error( 'image_flip_error', __('Image flip failed.'), $this->file );
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}
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/**
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* Saves current in-memory image to file.
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*
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* @since 3.5.0
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* @access public
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*
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* @param string|null $filename
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* @param string|null $mime_type
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* @return array|WP_Error {'path'=>string, 'file'=>string, 'width'=>int, 'height'=>int, 'mime-type'=>string}
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*/
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public function save( $filename = null, $mime_type = null ) {
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$saved = $this->_save( $this->image, $filename, $mime_type );
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if ( ! is_wp_error( $saved ) ) {
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$this->file = $saved['path'];
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$this->mime_type = $saved['mime-type'];
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}
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return $saved;
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}
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/**
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* @param resource $image
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* @param string|null $filename
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* @param string|null $mime_type
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* @return WP_Error|array
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*/
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protected function _save( $image, $filename = null, $mime_type = null ) {
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list( $filename, $extension, $mime_type ) = $this->get_output_format( $filename, $mime_type );
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if ( ! $filename )
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$filename = $this->generate_filename( null, null, $extension );
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if ( 'image/gif' == $mime_type ) {
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if ( ! $this->make_image( $filename, 'imagegif', array( $image, $filename ) ) )
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return new WP_Error( 'image_save_error', __('Image Editor Save Failed') );
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}
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elseif ( 'image/png' == $mime_type ) {
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// convert from full colors to index colors, like original PNG.
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if ( function_exists('imageistruecolor') && ! imageistruecolor( $image ) )
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imagetruecolortopalette( $image, false, imagecolorstotal( $image ) );
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if ( ! $this->make_image( $filename, 'imagepng', array( $image, $filename ) ) )
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return new WP_Error( 'image_save_error', __('Image Editor Save Failed') );
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}
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elseif ( 'image/jpeg' == $mime_type ) {
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if ( ! $this->make_image( $filename, 'imagejpeg', array( $image, $filename, $this->get_quality() ) ) )
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return new WP_Error( 'image_save_error', __('Image Editor Save Failed') );
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}
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else {
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return new WP_Error( 'image_save_error', __('Image Editor Save Failed') );
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}
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// Set correct file permissions
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$stat = stat( dirname( $filename ) );
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$perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
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@ chmod( $filename, $perms );
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/**
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* Filter the name of the saved image file.
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*
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* @since 2.6.0
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*
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* @param string $filename Name of the file.
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*/
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return array(
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'path' => $filename,
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'file' => wp_basename( apply_filters( 'image_make_intermediate_size', $filename ) ),
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'width' => $this->size['width'],
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'height' => $this->size['height'],
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'mime-type' => $mime_type,
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);
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}
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/**
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* Returns stream of current image.
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*
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* @since 3.5.0
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* @access public
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*
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* @param string $mime_type
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* @return bool
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*/
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public function stream( $mime_type = null ) {
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list( $filename, $extension, $mime_type ) = $this->get_output_format( null, $mime_type );
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switch ( $mime_type ) {
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case 'image/png':
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header( 'Content-Type: image/png' );
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return imagepng( $this->image );
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case 'image/gif':
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header( 'Content-Type: image/gif' );
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return imagegif( $this->image );
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default:
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header( 'Content-Type: image/jpeg' );
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return imagejpeg( $this->image, null, $this->get_quality() );
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}
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}
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/**
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* Either calls editor's save function or handles file as a stream.
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*
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* @since 3.5.0
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* @access protected
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*
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* @param string|stream $filename
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* @param callable $function
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* @param array $arguments
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* @return bool
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*/
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protected function make_image( $filename, $function, $arguments ) {
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if ( wp_is_stream( $filename ) )
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$arguments[1] = null;
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return parent::make_image( $filename, $function, $arguments );
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}
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}
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