import java.awt.Dimension;
import java.awt.Image;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.IIOParamController;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.stream.ImageInputStream;

public class ImageReaderTest4 extends ImageReaderTest1 {
    public ImageReaderTest4(String filename) {
        ImageReader reader = getReader(filename);
        Image shrinkImage = readShrinkImage(reader);
        Image subsamplingImage = readSubsamplingImage(reader);

        reader.dispose();

        initFrame(filename + " (Shrink)", shrinkImage);
        initFrame(filename + " (Subsampling)", subsamplingImage);
    }

    private ImageReader getReader(String filename) { 
        Iterator readers = ImageIO.getImageReadersBySuffix(getSuffix(filename));
        
        if (readers.hasNext()) {
            ImageReader reader = (ImageReader)readers.next();
            
            try {
                ImageInputStream stream = ImageIO.createImageInputStream(new File(filename));
                reader.setInput(stream);
                return reader;
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        
        return null;
    }

    private Image readSubsamplingImage(ImageReader reader) {
        ImageReadParam param = reader.getDefaultReadParam();

        param.setSourceSubsampling(10, 10, 0, 0);
        Image image = null;

        try {
            long start = System.currentTimeMillis();
            image = reader.read(0, param);
            long end = System.currentTimeMillis();

            System.out.println("Subsampling Image Load Time: " + (end - start));

        } catch (IOException ex) {
            ex.printStackTrace();
        }

        return image;
    }

    private Image readShrinkImage(ImageReader reader) {
        BufferedImage shrinkImage = null;

        try {
            long start = System.currentTimeMillis();
            BufferedImage image = reader.read(0);
            
            shrinkImage = new BufferedImage(image.getWidth()/10, image.getHeight()/10,
                                            image.getType());
            AffineTransformOp atOp = new AffineTransformOp(
                                   AffineTransform.getScaleInstance(0.1, 0.1), null);
            atOp.filter(image, shrinkImage);

            long end = System.currentTimeMillis();

            System.out.println("Shrink Image Load Time: " + (end - start));
        } catch (IOException ex) {
            ex.printStackTrace();
        }

        return shrinkImage;
    }
    
    public static void main(String[] args) {
        if (args.length == 1) {
            new ImageReaderTest4(args[0]);
        } else {
            System.out.println("Usage: java ImageReaderTest4 <filename>");
        }
    }
}