michael@0: /*
michael@0:  * Copyright (C) 2013 Square, Inc.
michael@0:  *
michael@0:  * Licensed under the Apache License, Version 2.0 (the "License");
michael@0:  * you may not use this file except in compliance with the License.
michael@0:  * You may obtain a copy of the License at
michael@0:  *
michael@0:  *      http://www.apache.org/licenses/LICENSE-2.0
michael@0:  *
michael@0:  * Unless required by applicable law or agreed to in writing, software
michael@0:  * distributed under the License is distributed on an "AS IS" BASIS,
michael@0:  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
michael@0:  * See the License for the specific language governing permissions and
michael@0:  * limitations under the License.
michael@0:  */
michael@0: package com.squareup.picasso;
michael@0: 
michael@0: import android.graphics.Bitmap;
michael@0: 
michael@0: /** Image transformation. */
michael@0: public interface Transformation {
michael@0:   /**
michael@0:    * Transform the source bitmap into a new bitmap. If you create a new bitmap instance, you must
michael@0:    * call {@link android.graphics.Bitmap#recycle()} on {@code source}. You may return the original
michael@0:    * if no transformation is required.
michael@0:    */
michael@0:   Bitmap transform(Bitmap source);
michael@0: 
michael@0:   /**
michael@0:    * Returns a unique key for the transformation, used for caching purposes. If the transformation
michael@0:    * has parameters (e.g. size, scale factor, etc) then these should be part of the key.
michael@0:    */
michael@0:   String key();
michael@0: }