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467 lines
13 KiB
467 lines
13 KiB
<?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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* |
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* @see WP_Image_Editor |
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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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* @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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* |
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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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* |
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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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* |
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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?'), $this->file ); |
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// Set artificially high because GD uses uncompressed images in memory. |
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wp_raise_memory_limit( 'image' ); |
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$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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* |
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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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* |
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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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* |
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* @param array $sizes { |
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* An array of image size arrays. Default sizes are 'small', 'medium', 'medium_large', '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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* Array of height, width values, and whether to crop. |
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* |
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* @type int $width Image width. Optional if `$height` is specified. |
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* @type int $height Image height. Optional if `$width` is specified. |
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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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* |
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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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* |
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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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* |
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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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* @return 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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* |
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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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* Filters 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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* |
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* @param string $mime_type The mime type of the image. |
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* @return bool True on success, false on failure. |
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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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* |
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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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