LienzoImageDataUtils.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.kie.workbench.common.stunner.client.lienzo.canvas.util;

import com.ait.lienzo.client.core.shape.Layer;
import com.ait.lienzo.client.core.types.ImageData;
import com.ait.lienzo.client.widget.LienzoPanel;

public class LienzoImageDataUtils {

    public static String toImageData(final Layer layer,
                                     final int x,
                                     final int y,
                                     final int width,
                                     final int height) {
        final ImageData imageData = layer.getContext().getImageData(x,
                                                                    y,
                                                                    width,
                                                                    height);
        if (null != imageData) {
            final LienzoPanel p = new LienzoPanel(width,
                                                  height);
            final Layer l = new Layer().setTransformable(true);
            p.add(l);
            l.getContext().putImageData(imageData,
                                        0,
                                        0);
            return l.toDataURL();
        }
        return null;
    }
}