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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.gallery3d.photoeditor.filters;
import android.media.effect.Effect;
import android.media.effect.EffectContext;
import com.android.gallery3d.photoeditor.Photo;
/**
* Image filter for photo editing.
*/
public abstract class Filter {
// TODO: This should be set in MFF instead.
private static final int DEFAULT_TILE_SIZE = 640;
private boolean isValid;
private EffectContext context;
private Effect effect;
protected void validate() {
isValid = true;
}
protected Effect getEffect(EffectContext context, String name) {
if (this.context != context) {
effect = context.getFactory().createEffect(name);
effect.setParameter("tile_size", DEFAULT_TILE_SIZE);
this.context = context;
}
return effect;
}
/**
* Some filters, e.g. lighting filters, are initially invalid until set up with parameters while
* others, e.g. Sepia or Posterize filters, are initially valid without parameters.
*/
public boolean isValid() {
return isValid;
}
public void release() {
if (effect != null) {
effect.release();
effect = null;
}
}
/**
* Processes the source bitmap and matrix and output the destination bitmap and matrix.
*
* @param context effect context bound to a GL context to create GL effect.
* @param src source photo as the input.
* @param dst destination photo having the same dimension as source photo as the output.
*/
public abstract void process(EffectContext context, Photo src, Photo dst);
}
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