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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.annotation.TargetApi;
import android.media.effect.Effect;
import android.media.effect.EffectContext;
import android.os.Parcel;
import android.os.Parcelable;
import com.android.gallery3d.common.ApiHelper;
import com.android.gallery3d.photoeditor.Photo;
import java.util.HashMap;
/**
* Image filter for photo editing; all of its methods must be called from a single GL thread.
*/
@TargetApi(ApiHelper.VERSION_CODES.ICE_CREAM_SANDWICH)
public abstract class Filter implements Parcelable {
// TODO: This should be set in MFF instead.
private static final int DEFAULT_TILE_SIZE = 640;
private static final HashMap<Filter, Effect> effects = new HashMap<Filter, Effect>();
private static EffectContext context;
/**
* Filter context should be released before the current GL context is lost.
*/
public static void releaseContext() {
if (context != null) {
// Release all effects created with the releasing context.
for (Effect effect : effects.values()) {
effect.release();
}
effects.clear();
context.release();
context = null;
}
}
public void release() {
Effect effect = effects.remove(this);
if (effect != null) {
effect.release();
}
}
protected Effect getEffect(String name) {
Effect effect = effects.get(this);
if (effect == null) {
if (context == null) {
context = EffectContext.createWithCurrentGlContext();
}
effect = context.getFactory().createEffect(name);
effect.setParameter("tile_size", DEFAULT_TILE_SIZE);
effects.put(this, effect);
}
return effect;
}
/**
* Processes the source bitmap and matrix and output the destination bitmap and matrix.
*
* @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(Photo src, Photo dst);
/**
* Instantiates CREATOR of subclasses for Parcelable implementations.
*/
protected static <T extends Filter> Parcelable.Creator<T> creatorOf(Class<T> filterClass) {
return new FilterCreator<T>(filterClass);
}
/**
* Saves states for restoring filter later; subclasses can override this to persist states.
*/
protected void writeToParcel(Parcel out) {
}
/**
* Restores filter from the saved states; subclasses can override this to persist states.
*/
protected void readFromParcel(Parcel in) {
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
writeToParcel(dest);
}
}
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