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/* PixmapVolatileImage.java -- VolatileImage implementation around a Pixmap

   Copyright (C) 2007 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.java.awt.peer.x;

import gnu.x11.GC;

import gnu.x11.Pixmap;

import gnu.x11.image.Image;

import gnu.x11.image.ZPixmap;

import java.awt.Graphics2D;

import java.awt.GraphicsConfiguration;

import java.awt.GraphicsEnvironment;

import java.awt.ImageCapabilities;

import java.awt.Point;

import java.awt.Transparency;

import java.awt.color.ColorSpace;

import java.awt.image.BufferedImage;

import java.awt.image.ColorModel;

import java.awt.image.ComponentColorModel;

import java.awt.image.ComponentSampleModel;

import java.awt.image.DataBuffer;

import java.awt.image.ImageObserver;

import java.awt.image.Raster;

import java.awt.image.SampleModel;

import java.awt.image.VolatileImage;

import java.awt.image.WritableRaster;

/**

 * A {@link VolatileImage} implementation that wraps an X Pixmap.

 */

class PixmapVolatileImage

  extends VolatileImage

{

  /**

   * The shared capabilities instance.

   */

  private static final ImageCapabilities caps = new ImageCapabilities(true);

  /**

   * The underlying pixmap.

   */

  private Pixmap pixmap;

  /**

   * Creates a new PixmapVolatileImage.

   *

   * @param w the width of the image

   * @param h the height of the image

   */

  public PixmapVolatileImage(int w, int h)

  {

    GraphicsEnvironment env =

      GraphicsEnvironment.getLocalGraphicsEnvironment();

    XGraphicsDevice dev = (XGraphicsDevice) env.getDefaultScreenDevice();

    pixmap = new Pixmap(dev.getDisplay(), w, h);

    // Clear pixmap.

    GC gc = new GC(pixmap);

    gc.set_foreground(0xffffffff);

    pixmap.fill_rectangle(gc, 0, 0, w, h);

  }

  @Override

  public boolean contentsLost()

  {

    return false;

  }

  @Override

  public Graphics2D createGraphics()

  {

    return new XGraphics2D(pixmap);

  }

  @Override

  public ImageCapabilities getCapabilities()

  {

    return caps;

  }

  @Override

  public int getHeight()

  {

    return pixmap.height;

  }

  @Override

  public BufferedImage getSnapshot()

  {

    // TODO: Support non-24-bit resolutions.

    int w = pixmap.width;

    int h = pixmap.height;

    ZPixmap zpixmap = (ZPixmap) pixmap.image(0, 0, w, h, 0xffffffff,

                                             Image.Format.ZPIXMAP);

    DataBuffer buffer = new ZPixmapDataBuffer(zpixmap);

    SampleModel sm = new ComponentSampleModel(DataBuffer.TYPE_BYTE, w, h, 4,

                                              w * 4,

                                              new int[]{0, 1, 2, 3 });

    ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_LINEAR_RGB);

    ColorModel cm = new ComponentColorModel(cs, true, false,

                                            Transparency.OPAQUE,

                                            DataBuffer.TYPE_BYTE);

    WritableRaster raster = Raster.createWritableRaster(sm, buffer,

                                                        new Point(0, 0));

    return new BufferedImage(cm, raster, false, null);

  }

  @Override

  public int getWidth()

  {

    return pixmap.width;

  }

  @Override

  public int validate(GraphicsConfiguration gc)

  {

    // TODO: Check compatibility with gc.

    return IMAGE_OK;

  }

  @Override

  public int getHeight(ImageObserver observer)

  {

    return getHeight();

  }

  @Override

  public Object getProperty(String name, ImageObserver observer)

  {

    return null;

  }

  @Override

  public int getWidth(ImageObserver observer)

  {

    return getWidth();

  }

  /**

   * Returns the underlying X pixmap. This is used for the graphics code.

   *

   * @return the underlying X pixmap

   */

  Pixmap getPixmap()

  {

    return pixmap;

  }

}