VignetteFilterPostprocessor.java

package jp.wasabeef.fresco.processors.gpu;

/**
 * Copyright (C) 2017 Wasabeef
 *
 * 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.
 */

import android.content.Context;
import android.graphics.PointF;
import com.facebook.cache.common.CacheKey;
import com.facebook.cache.common.SimpleCacheKey;
import java.util.Arrays;
import jp.co.cyberagent.android.gpuimage.GPUImageVignetteFilter;

/**
 * Performs a vignetting effect, fading out the image at the edges
 * The directional intensity of the vignetting,
 * with a default of x = 0.5, y = 0.5, start = 0, end = 0.75
 */
public class VignetteFilterPostprocessor extends GPUFilterPostprocessor {

  private PointF center;
  private float[] vignetteColor;
  private float vignetteStart;
  private float vignetteEnd;

  public VignetteFilterPostprocessor(Context context) {
    this(context, new PointF(0.5f, 0.5f), new float[] { 0.0f, 0.0f, 0.0f }, 0.0f, 0.75f);
  }

  public VignetteFilterPostprocessor(Context context, PointF center, float[] color, float start,
      float end) {
    super(context, new GPUImageVignetteFilter());

    this.center = center;
    this.vignetteColor = color;
    this.vignetteStart = start;
    this.vignetteEnd = end;

    GPUImageVignetteFilter filter = getFilter();
    filter.setVignetteCenter(this.center);
    filter.setVignetteColor(this.vignetteColor);
    filter.setVignetteStart(this.vignetteStart);
    filter.setVignetteEnd(this.vignetteEnd);
  }

  @Override public CacheKey getPostprocessorCacheKey() {
    return new SimpleCacheKey("center=" + center.toString() +
        ",color=" + Arrays.toString(vignetteColor) +
        ",start=" + vignetteStart + ",end=" + vignetteEnd);
  }
}