/**

 * Back 2 Browser Bytecode Translator Copyright (C) 2012 Jaroslav Tulach

 * <jaroslav.tulach@apidesign.org>

 *

 * This program is free software: you can redistribute it and/or modify it under

 * the terms of the GNU General Public License as published by the Free Software

 * Foundation, version 2 of the License.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more

 * details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program. Look for COPYING file in the top folder. If not, see

 * http://opensource.org/licenses/GPL-2.0.

 */

package org.apidesign.bck2brwsr.htmlpage;

import net.java.html.canvas.ImageData;

import org.apidesign.bck2brwsr.core.JavaScriptBody;

/**

 *

 * @author Anton Epple <toni.epple@eppleton.de>

 */

public class ImageDataWrapper implements ImageData {

    private double width, height = -1;

    private Object imageData;

    private Data data;

    public ImageDataWrapper(Object imageData) {

        this.imageData = imageData;

    }

    private Data getData() {

        if (data == null) {

            data = new Data(getDataImpl(imageData));

        }

        return data;

    }

    @JavaScriptBody(args = {"imageData"}, body = "return imageData.data")

    public native Object getDataImpl(Object imageData);

    public double getWidth() {

        if (width == -1) {

            width = getWidthImpl(imageData);

        }

        return width;

    }

    @JavaScriptBody(args = {"imageData"}, body = "return imagedata.width;")

    private static native int getWidthImpl(Object imageData);

    public double getHeight() {

        if (height == -1) {

            height = getHeightImpl(imageData);

        }

        return height;

    }

    @JavaScriptBody(args = {"imageData"}, body = "return imagedata.height;")

    private static native int getHeightImpl(Object imageData);

    Object object() {

        return imageData;

    }

    @Override

    public int getR(int x, int y) {

        int idx = (x + y * (int)width) * 4;

        return getData().get(idx);

    }

    @Override

    public int getG(int x, int y) {

        int idx = (x + y * (int)width) * 4;

        return getData().get(idx + 1);

    }

    @Override

    public int getB(int x, int y) {

        int idx = (x + y * (int)width) * 4;

        return getData().get(idx + 2);

    }

    @Override

    public int getA(int x, int y) {

        int idx = (x + y * (int)width) * 4;

        return getData().get(idx + 3);

    }

    @Override

    public void setR(int x, int y, int value) {

        int idx = (x + y * (int)width) * 4;

        getData().set(idx, value);

    }

    @Override

    public void setG(int x, int y, int value) {

        int idx = (x + y * (int)width) * 4;

        getData().set(idx + 1, value);

    }

    @Override

    public void setB(int x, int y, int value) {

        int idx = (x + y * (int)width) * 4;

        getData().set(idx + 2, value);

    }

    @Override

    public void setA(int x, int y, int value) {

        int idx = (x + y * (int)width) * 4;

        getData().set(idx + 3, value);

    }

    private static class Data {

        Object data;

        public Data(Object data) {

            this.data = data;

        }

        public int get(int index) {

            return getImpl(data, index);

        }

        public void set(int index, int value) {

            setImpl(data, index, value);

        }

        @JavaScriptBody(args = {"data", "index", "value"}, body = "data[index]=value;")

        private static native void setImpl(Object data, int index, int value);

        @JavaScriptBody(args = {"imagedata", "index"}, body = "return data[index];")

        private static native int getImpl(Object data, int index);

    }

}