ImageDataCanvas.java

/*
  ImageDataCanvas.java

  (c) 2008-2013 Edward Swartz

  All rights reserved. This program and the accompanying materials
  are made available under the terms of the Eclipse Public License v1.0
  which accompanies this distribution, and is available at
  http://www.eclipse.org/legal/epl-v10.html
 */
package v9t9.video;

import java.nio.Buffer;

import org.eclipse.swt.graphics.ImageData;
import v9t9.common.video.BitmapVdpCanvas;


public abstract class ImageDataCanvas extends BitmapVdpCanvas {

	protected ImageData imageData;
	protected int bytesPerLine;

	protected int pixSize;
	
	public ImageDataCanvas() {
		super();
	}

	public ImageData getImageData() {
		return imageData;
	}

	@Override
	final public int getLineStride() {
		return bytesPerLine;
	}

	/* (non-Javadoc)
	 * @see v9t9.common.video.ICanvas#getPixelStride()
	 */
	@Override
	final public int getPixelStride() {
		return pixSize;
	}


	@Override
	public void doChangeSize() {
		createImageData();
	}

	/** Create imageData and set bytesPerLine */
	abstract protected void createImageData();

	public int getDisplayAdjustOffset() {
		int displayAdjust = getYOffset() * getLineStride() + getXOffset() * getPixelStride();
		return displayAdjust;
	}


	/**
	 * @param buffer
	 * @return 
	 */
	public Buffer copy(Buffer buffer) {
		return copyBytes(buffer, imageData.data, imageData.bytesPerLine, imageData.bytesPerLine / imageData.width);
	}
	
	
}