source: extensions/jiwigo-ws-api/src/main/java/fr/mael/jiwigo/transverse/util/ImagesUtil.java @ 9893

package fr.mael.jiwigo.transverse.util;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.PixelGrabber;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.FileImageOutputStream;
import javax.swing.ImageIcon;

/*
 *  jiwigo-ws-api Piwigo webservice access Api
 *  Copyright (c) 2010-2011 Mael mael@le-guevel.com
 *                All Rights Reserved
 *
 *  This library is free software. It comes without any warranty, to
 *  the extent permitted by applicable law. You can redistribute it
 *  and/or modify it under the terms of the Do What The Fuck You Want
 *  To Public License, Version 2, as published by Sam Hocevar. See
 *  http://sam.zoy.org/wtfpl/COPYING for more details.
 */
/**

 * @author mael
 *
 */
public class ImagesUtil {
    /**
     * Logger
     */
    public static final org.apache.commons.logging.Log LOG = org.apache.commons.logging.LogFactory
            .getLog(ImagesUtil.class);

    /**
     * rotates an image
     * @param image the image to rotate
     * @param angle the angle of rotation
     * @return the rotated image
     */
    public static BufferedImage rotate(BufferedImage image, double angle) {
        GraphicsConfiguration gc = getDefaultConfiguration();
        double sin = Math.abs(Math.sin(angle)), cos = Math.abs(Math.cos(angle));
        int w = image.getWidth(), h = image.getHeight();
        int neww = (int) Math.floor(w * cos + h * sin), newh = (int) Math.floor(h * cos + w * sin);
        int transparency = image.getColorModel().getTransparency();
        BufferedImage result = gc.createCompatibleImage(neww, newh, transparency);
        Graphics2D g = result.createGraphics();
        g.translate((neww - w) / 2, (newh - h) / 2);
        g.rotate(angle, w / 2, h / 2);
        g.drawRenderedImage(image, null);
        return result;
    }

    /**
     * @return the graphics configuration
     */
    public static GraphicsConfiguration getDefaultConfiguration() {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();
        return gd.getDefaultConfiguration();
    }

    /**
     * Writes an image in a file
     * @param file the file
     * @param bufferedImage the image
     * @throws IOException
     */
    public static void writeImageToPNG(File file, BufferedImage bufferedImage) throws IOException {
        ImageIO.write(bufferedImage, "png", file);
    }

    /**
     * scales an image
     * @param filePath the path to the file of the image
     * @param tempName the name of the resulting file
     * @param width the width
     * @param height the height
     * @return true if successful
     * @throws IOException
     * @throws Exception
     */
    public static boolean scale(String filePath, String tempName, int width, int height) throws IOException {
        File file = new File(filePath);
        InputStream imageStream = new BufferedInputStream(new FileInputStream(filePath));
        Image image = (Image) ImageIO.read(imageStream);

        double thumbRatio = (double) width / (double) height;
        int imageWidth = image.getWidth(null);
        int imageHeight = image.getHeight(null);
        if (imageWidth < width || imageHeight < height) {
            return false;
        }
        double imageRatio = (double) imageWidth / (double) imageHeight;
        if (thumbRatio < imageRatio) {
            height = (int) (width / imageRatio);
        } else {
            width = (int) (height * imageRatio);
        }
        BufferedImage thumbImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics2D = thumbImage.createGraphics();
        graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        graphics2D.drawImage(image, 0, 0, width, height, null);

        //      ImageIO.write(thumbImage, "jpg", new FileOutputStream(System.getProperty("java.io.tmpdir") + "/" + tempName));
        saveImage(System.getProperty("java.io.tmpdir") + "/" + tempName, thumbImage);
        return true;

    }

    /**
     * Save an image
     * @param fileName the name of the file
     * @param img the img
     * @throws FileNotFoundException
     * @throws IOException
     */
    private static void saveImage(String fileName, BufferedImage img) throws FileNotFoundException, IOException {
        Iterator iter = ImageIO.getImageWritersByFormatName("jpeg");
        ImageWriter writer = (ImageWriter) iter.next();
        ImageWriteParam iwp = writer.getDefaultWriteParam();
        iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        iwp.setCompressionQuality(1);
        File outputfile = new File(fileName);
        FileImageOutputStream output = new FileImageOutputStream(outputfile);
        writer.setOutput(output);
        IIOImage outimage = new IIOImage(img, null, null);
        writer.write(null, outimage, iwp);
        writer.dispose();
    }

    // This method returns a buffered image with the contents of an image
    public static BufferedImage toBufferedImage(Image image) {
        if (image instanceof BufferedImage) {
            return (BufferedImage) image;
        }

        // This code ensures that all the pixels in the image are loaded
        image = new ImageIcon(image).getImage();

        // Determine if the image has transparent pixels; for this method's
        // implementation, see Determining If an Image Has Transparent Pixels
        boolean hasAlpha = hasAlpha(image);

        // Create a buffered image with a format that's compatible with the screen
        BufferedImage bimage = null;
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        try {
            // Determine the type of transparency of the new buffered image
            int transparency = Transparency.OPAQUE;
            if (hasAlpha) {
                transparency = Transparency.BITMASK;
            }

            // Create the buffered image
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            GraphicsConfiguration gc = gs.getDefaultConfiguration();
            bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency);
        } catch (HeadlessException e) {
            // The system does not have a screen
        }

        if (bimage == null) {
            // Create a buffered image using the default color model
            int type = BufferedImage.TYPE_INT_RGB;
            if (hasAlpha) {
                type = BufferedImage.TYPE_INT_ARGB;
            }
            bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
        }

        // Copy image to buffered image
        Graphics g = bimage.createGraphics();

        // Paint the image onto the buffered image
        g.drawImage(image, 0, 0, null);
        g.dispose();

        return bimage;
    }

    /**
     *  This method returns true if the specified image has transparent pixels
     * @param image the image to check
     * @return true or false
     */
    public static boolean hasAlpha(Image image) {
        // If buffered image, the color model is readily available
        if (image instanceof BufferedImage) {
            BufferedImage bimage = (BufferedImage) image;
            return bimage.getColorModel().hasAlpha();
        }

        // Use a pixel grabber to retrieve the image's color model;
        // grabbing a single pixel is usually sufficient
        PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
        try {
            pg.grabPixels();
        } catch (InterruptedException e) {
        }

        // Get the image's color model
        ColorModel cm = pg.getColorModel();
        return cm.hasAlpha();
    }

}