WordPress 4.1.4-scripts
[autoinstalls/wordpress.git] / wp-includes / class-wp-image-editor.php
index 81909f89be0b54eee6b55006ebdb9903416c7784..fcca5574b875d6a0eff71a3c45dbb60870f913b7 100644 (file)
@@ -16,7 +16,8 @@ abstract class WP_Image_Editor {
        protected $size = null;
        protected $mime_type = null;
        protected $default_mime_type = 'image/jpeg';
-       protected $quality = 90;
+       protected $quality = false;
+       protected $default_quality = 90;
 
        /**
         * Each instance handles a single file.
@@ -82,13 +83,17 @@ abstract class WP_Image_Editor {
        /**
         * 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
         * @access public
         * @abstract
         *
-        * @param int $max_w
-        * @param int $max_h
-        * @param boolean $crop
+        * @param  int|null $max_w Image width.
+        * @param  int|null $max_h Image height.
+        * @param  boolean  $crop
         * @return boolean|WP_Error
         */
        abstract public function resize( $max_w, $max_h, $crop = false );
@@ -198,6 +203,22 @@ abstract class WP_Image_Editor {
                return true;
        }
 
+       /**
+        * Gets the Image Compression quality on a 1-100% scale.
+        *
+        * @since 4.0.0
+        * @access public
+        *
+        * @return int $quality 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.
         *
@@ -205,19 +226,61 @@ abstract class WP_Image_Editor {
         * @access public
         *
         * @param int $quality Compression Quality. Range: [1,100]
-        * @return boolean
+        * @return boolean|WP_Error True if set successfully; WP_Error on failure.
         */
-       public function set_quality( $quality ) {
-               /**
-                * Filter the default quality setting.
-                *
-                * @since 3.5.0
-                *
-                * @param int $quality Quality level between 0 (low) and 100 (high).
-                */
-               $this->quality = apply_filters( 'wp_editor_set_quality', $quality );
-
-               return ( (bool) $this->quality );
+       public function set_quality( $quality = null ) {
+               if ( null === $quality ) {
+                       /**
+                        * Filter the default image compression quality setting.
+                        *
+                        * Applies only during initial editor instantiation, or when set_quality() is run
+                        * manually without the `$quality` argument.
+                        *
+                        * set_quality() has priority over the filter.
+                        *
+                        * @since 3.5.0
+                        *
+                        * @param int    $quality   Quality level between 1 (low) and 100 (high).
+                        * @param string $mime_type Image mime type.
+                        */
+                       $quality = apply_filters( 'wp_editor_set_quality', $this->default_quality, $this->mime_type );
+
+                       if ( 'image/jpeg' == $this->mime_type ) {
+                               /**
+                                * Filter the JPEG compression quality for backward-compatibility.
+                                *
+                                * Applies only during initial editor instantiation, or when set_quality() is run
+                                * manually without the `$quality` argument.
+                                *
+                                * set_quality() 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 = $this->default_quality;
+                       }
+               }
+
+               // Allow 0, but squash to 1 due to identical images in GD, and for backwards 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].') );
+               }
        }
 
        /**
@@ -236,8 +299,7 @@ abstract class WP_Image_Editor {
         * @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;
+               $new_ext = null;
 
                // By default, assume specified type takes priority
                if ( $mime_type ) {