app/src/main/java/org/apache/taverna/mobile/utils/SvgSoftwareLayerSetter.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.taverna.mobile.utils;

import com.bumptech.glide.request.RequestListener;
import com.bumptech.glide.request.target.ImageViewTarget;
import com.bumptech.glide.request.target.Target;

import android.annotation.TargetApi;
import android.graphics.drawable.PictureDrawable;
import android.os.Build;
import android.widget.ImageView;

/**
 * Listener which updates the {@link ImageView} to be software rendered,
 * because {@link com.caverock.androidsvg.SVG SVG}/{@link android.graphics.Picture Picture}
 * can't render on a hardware backed {@link android.graphics.Canvas Canvas}.
 *
 * @param <T> not used, here to prevent unchecked warnings at usage
 */
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class SvgSoftwareLayerSetter<T> implements RequestListener<T, PictureDrawable> {

    @Override
    public boolean onException(Exception e, T model, Target<PictureDrawable> target,
                               boolean isFirstResource) {
        ImageView view = ((ImageViewTarget<?>) target).getView();
        if (Build.VERSION_CODES.HONEYCOMB <= Build.VERSION.SDK_INT) {
            view.setLayerType(ImageView.LAYER_TYPE_NONE, null);
        }
        return false;
    }

    @Override
    public boolean onResourceReady(PictureDrawable resource, T model
            , Target<PictureDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
        ImageView view = ((ImageViewTarget<?>) target).getView();
        if (Build.VERSION_CODES.HONEYCOMB <= Build.VERSION.SDK_INT) {
            view.setLayerType(ImageView.LAYER_TYPE_SOFTWARE, null);
        }
        return false;
    }
}