DataBuffer.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.
 */
/**
 * @author Igor V. Stolyarov
 */
package com.google.code.appengine.awt.image;

import org.apache.harmony.awt.gl.image.DataBufferListener;
import org.apache.harmony.awt.internal.nls.Messages;

public abstract class DataBuffer {

    public static final int TYPE_BYTE = 0;

    public static final int TYPE_USHORT = 1;

    public static final int TYPE_SHORT = 2;

    public static final int TYPE_INT = 3;

    public static final int TYPE_FLOAT = 4;

    public static final int TYPE_DOUBLE = 5;

    public static final int TYPE_UNDEFINED = 32;

    protected int dataType;

    protected int banks;

    protected int offset;

    protected int size;

    protected int offsets[];
    
    boolean dataChanged = true;
    boolean dataTaken = false;
    DataBufferListener listener;

    static {
        AwtImageBackdoorAccessorImpl.init();
    }

    protected DataBuffer(int dataType, int size, int numBanks, int[] offsets) {
        this.dataType = dataType;
        this.size = size;
        this.banks = numBanks;
        this.offsets = offsets.clone();
        this.offset = offsets[0];
    }

    protected DataBuffer(int dataType, int size, int numBanks, int offset) {
        this.dataType = dataType;
        this.size = size;
        this.banks = numBanks;
        this.offset = offset;
        this.offsets = new int[numBanks];
        int i = 0;
        while (i < numBanks) {
            offsets[i++] = offset;
        }
    }

    protected DataBuffer(int dataType, int size, int numBanks) {
        this.dataType = dataType;
        this.size = size;
        this.banks = numBanks;
        this.offset = 0;
        this.offsets = new int[numBanks];
    }

    protected DataBuffer(int dataType, int size) {
        this.dataType = dataType;
        this.size = size;
        this.banks = 1;
        this.offset = 0;
        this.offsets = new int[1];
    }

    public abstract void setElem(int bank, int i, int val);

    public void setElemFloat(int bank, int i, float val) {
        setElem(bank, i, (int) val);
    }

    public void setElemDouble(int bank, int i, double val) {
        setElem(bank, i, (int) val);
    }

    public void setElem(int i, int val) {
        setElem(0, i, val);
    }

    public abstract int getElem(int bank, int i);

    public float getElemFloat(int bank, int i) {
        return getElem(bank, i);
    }

    public double getElemDouble(int bank, int i) {
        return getElem(bank, i);
    }

    public void setElemFloat(int i, float val) {
        setElemFloat(0, i, val);
    }

    public void setElemDouble(int i, double val) {
        setElemDouble(0, i, val);
    }

    public int getElem(int i) {
        return getElem(0, i);
    }

    public float getElemFloat(int i) {
        return getElem(0, i);
    }

    public double getElemDouble(int i) {
        return getElem(i);
    }

    public int[] getOffsets() {
        return offsets;
    }

    public int getSize() {
        return size;
    }

    public int getOffset() {
        return offset;
    }

    public int getNumBanks() {
        return banks;
    }

    public int getDataType() {
        return this.dataType;
    }

    public static int getDataTypeSize(int type) {
        switch (type) {

        case TYPE_BYTE:
            return 8;

        case TYPE_USHORT:
        case TYPE_SHORT:
            return 16;

        case TYPE_INT:
        case TYPE_FLOAT:
            return 32;

        case TYPE_DOUBLE:
            return 64;

        default:
            // awt.22C=Unknown data type {0}
            throw new IllegalArgumentException(Messages.getString("awt.22C", type)); //$NON-NLS-1$
        }
    }
    
    void notifyChanged(){
        if(listener != null && !dataChanged){
            dataChanged = true;
            listener.dataChanged();
        }
    }
    
    void notifyTaken(){
        if(listener != null && !dataTaken){
            dataTaken = true;
            listener.dataTaken();
        }
    }
    
    void releaseData(){
        if(listener != null && dataTaken){
            dataTaken = false;
            listener.dataReleased();
        }
    }
    
    void addDataBufferListener(DataBufferListener listener){
        this.listener = listener;
    }
    
    void removeDataBufferListener(){
        listener = null;
    }
    
    void validate(){
        dataChanged = false;
    }
    
}