Creating a Buffered Image from an Image - Java 2D Graphics

Java examples for 2D Graphics:BufferedImage Create

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Description

Creating a Buffered Image from an Image

Demo Code

import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.PixelGrabber;

import javax.swing.ImageIcon;

public class Main {
  // 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;
    }// w w  w  .j a  v  a  2s  . c o m

    image = new ImageIcon(image).getImage();

    boolean hasAlpha = hasAlpha(image);

    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) {
      int type = BufferedImage.TYPE_INT_RGB;
      if (hasAlpha) {
        type = BufferedImage.TYPE_INT_ARGB;
      }
      bimage = new BufferedImage(image.getWidth(null), image.getHeight(null),
          type);
    }

    Graphics g = bimage.createGraphics();

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

    return bimage;
  }

  public static boolean hasAlpha(Image image) {
    if (image instanceof BufferedImage) {
      BufferedImage bimage = (BufferedImage) image;
      return bimage.getColorModel().hasAlpha();
    }
    PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
    try {
      pg.grabPixels();
    } catch (InterruptedException e) {
    }
    ColorModel cm = pg.getColorModel();
    return cm.hasAlpha();
  }
}

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