JBHiDPIScaledImage.java

/*
 * Copyright 2000-2013 JetBrains s.r.o.
 *
 * 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.pushingpixels.flamingo.internal.hidpi;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.ImageObserver;
import java.awt.image.WritableRaster;
import java.util.Hashtable;

/**
 * @author Konstantin Bulenkov
 */
public class JBHiDPIScaledImage extends BufferedImage implements IsHiDpiAware {
	private final Image myImage;
	private int myWidth; // == myImage.width / scale
	private int myHeight; // == myImage.height / scale

	public JBHiDPIScaledImage(int width, int height, int type) {
		this(null, 2 * width, 2 * height, type);
	}

	public JBHiDPIScaledImage(Image image, int width, int height, int type) {
		// In case there's a delegate image, create a dummy wrapper image of 1x1
		// size
		super(image != null ? 1 : width, image != null ? 1 : height, type);
		myImage = image;
		myWidth = width;
		myHeight = height;
	}

	public JBHiDPIScaledImage(ColorModel cm, WritableRaster raster, boolean isRasterPremultiplied,
			Hashtable<?, ?> properties, int width, int height) {
		super(cm, raster, isRasterPremultiplied, properties);
		myImage = null;
		myWidth = width;
		myHeight = height;
	}

	@Override
	public boolean isHiDpiAware() {
		return true;
	}

	public Image getDelegate() {
		return myImage;
	}

	@Override
	public int getWidth() {
		return myImage != null ? myWidth : super.getWidth();
	}

	@Override
	public int getHeight() {
		return myImage != null ? myHeight : super.getHeight();
	}

	@Override
	public int getWidth(ImageObserver observer) {
		return myImage != null ? myWidth : super.getWidth(observer);
	}

	@Override
	public int getHeight(ImageObserver observer) {
		return myImage != null ? myHeight : super.getHeight(observer);
	}

	@Override
	public Graphics2D createGraphics() {
		Graphics2D g = super.createGraphics();
		if (myImage == null) {
			return new HiDPIScaledGraphics(g);
		}
		return g;
	}
}