Subversion Repositories openrisc

/* VolatileImageGraphics.java

   Copyright (C) 2006 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.gtk;

import java.awt.AlphaComposite;

import java.awt.Color;

import java.awt.Composite;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.GraphicsConfiguration;

import java.awt.Image;

import java.awt.Point;

import java.awt.Shape;

import java.awt.Toolkit;

import java.awt.font.GlyphVector;

import java.awt.geom.AffineTransform;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

import java.awt.image.BufferedImage;

import java.awt.image.ColorModel;

import java.awt.image.ImageObserver;

import java.awt.image.ImageProducer;

import java.awt.image.Raster;

import java.awt.image.WritableRaster;

import java.util.Hashtable;

public class VolatileImageGraphics extends ComponentGraphics

{

  private GtkVolatileImage owner;

  private BufferedImage buffer;

  public VolatileImageGraphics(GtkVolatileImage img)

  {

    this.owner = img;

    cairo_t = initFromVolatile( owner.nativePointer );

    setup( cairo_t );

  }

  private VolatileImageGraphics(VolatileImageGraphics copy)

  {

    this.owner = copy.owner;

    cairo_t = initFromVolatile(owner.nativePointer);

    copy( copy, cairo_t );

  }

  public void copyAreaImpl(int x, int y, int width, int height, int dx, int dy)

  {

    owner.copyArea(x, y, width, height, dx, dy);

  }

  public GraphicsConfiguration getDeviceConfiguration()

  {

    GraphicsConfiguration conf;

    if (owner.component != null)

      {

        conf = owner.component.getGraphicsConfiguration();

      }

    else

      {

        return java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment()

          .getDefaultScreenDevice().getDefaultConfiguration();

      }

    return conf;

  }

  public Graphics create()

  {

    return new VolatileImageGraphics( this );

  }

  public void draw(Shape s)

  {

    if (comp == null || comp instanceof AlphaComposite)

      super.draw(s);

    // Custom composite

    else

      {

        // Draw operation to temporary buffer

        createBuffer();

        Graphics2D g2d = (Graphics2D)buffer.getGraphics();

        g2d.setColor(this.getColor());

        g2d.setStroke(this.getStroke());

        g2d.draw(s);

        drawComposite(s.getBounds2D(), null);

      }

  }

  public void fill(Shape s)

  {

    if (comp == null || comp instanceof AlphaComposite)

      super.fill(s);

    // Custom composite

    else

      {

        // Draw operation to temporary buffer

        createBuffer();

        Graphics2D g2d = (Graphics2D)buffer.getGraphics();

        g2d.setPaint(this.getPaint());

        g2d.setColor(this.getColor());

        g2d.fill(s);

        drawComposite(s.getBounds2D(), null);

      }

  }

  public void drawGlyphVector(GlyphVector gv, float x, float y)

  {

    if (comp == null || comp instanceof AlphaComposite)

      super.drawGlyphVector(gv, x, y);

    // Custom composite

    else

      {

        // Draw operation to temporary buffer

        createBuffer();

        Graphics2D g2d = (Graphics2D)buffer.getGraphics();

        g2d.setPaint(this.getPaint());

        g2d.setColor(this.getColor());

        g2d.drawGlyphVector(gv, x, y);

        Rectangle2D bounds = gv.getLogicalBounds();

        bounds = new Rectangle2D.Double(x + bounds.getX(), y + bounds.getY(),

                                        bounds.getWidth(), bounds.getHeight());

        drawComposite(bounds, null);

      }

  }

  protected boolean drawImage(Image img, AffineTransform xform,

                              Color bgcolor, ImageObserver obs)

    {

      if (comp == null || comp instanceof AlphaComposite)

        return super.drawImage(img, xform, bgcolor, obs);

      // Custom composite

      else

        {

          // Get buffered image of source

          if( !(img instanceof BufferedImage) )

            {

              ImageProducer source = img.getSource();

              if (source == null)

                return false;

              img = Toolkit.getDefaultToolkit().createImage(source);

            }

          BufferedImage bImg = (BufferedImage) img;

          // Find dimensions of translation

          Point2D origin = new Point2D.Double(bImg.getMinX(), bImg.getMinY());

          Point2D pt = new Point2D.Double(bImg.getWidth(), bImg.getHeight());

          if (xform != null)

            {

              origin = xform.transform(origin, origin);

              pt = xform.transform(pt, pt);

            }

          // Create buffer and draw image

          createBuffer();

          Graphics2D g2d = (Graphics2D)buffer.getGraphics();

          g2d.setRenderingHints(this.getRenderingHints());

          g2d.drawImage(img, xform, obs);

          // Perform compositing from buffer to screen

          return drawComposite(new Rectangle2D.Double((int)origin.getX(),

                                                      (int)origin.getY(),

                                                      (int)pt.getX(),

                                                      (int)pt.getY()),

                               obs);

        }

    }

  public boolean drawImage(Image img, int x, int y, ImageObserver observer)

  {

    if (img instanceof GtkVolatileImage

        && (comp == null || comp instanceof AlphaComposite))

      {

        owner.drawVolatile( ((GtkVolatileImage)img).nativePointer,

                            x, y,

                            ((GtkVolatileImage)img).width,

                            ((GtkVolatileImage)img).height );

        return true;

      }

    return super.drawImage( img, x, y, observer );

  }

  public boolean drawImage(Image img, int x, int y, int width, int height,

                           ImageObserver observer)

  {

    if ((img instanceof GtkVolatileImage)

        && (comp == null || comp instanceof AlphaComposite))

      {

        owner.drawVolatile( ((GtkVolatileImage)img).nativePointer,

                            x, y, width, height );

        return true;

      }

    return super.drawImage( img, x, y, width, height, observer );

  }

  protected Rectangle2D getRealBounds()

  {

    return new Rectangle2D.Double(0, 0, owner.width, owner.height);

  }

  private boolean drawComposite(Rectangle2D bounds, ImageObserver observer)

  {

    // Clip source to visible areas that need updating

    Rectangle2D clip = this.getClipBounds();

    Rectangle2D.intersect(bounds, clip, bounds);

    BufferedImage buffer2 = buffer;

    if (!bounds.equals(buffer2.getRaster().getBounds()))

      buffer2 = buffer2.getSubimage((int)bounds.getX(), (int)bounds.getY(),

                                    (int)bounds.getWidth(),

                                    (int)bounds.getHeight());

    // Get current on-screen pixels (destination) and clip to bounds

    BufferedImage current = owner.getSnapshot();

    double[] points = new double[] {bounds.getX(), bounds.getY(),

                                    bounds.getMaxX(), bounds.getMaxY()};

    transform.transform(points, 0, points, 0, 2);

    Rectangle2D deviceBounds = new Rectangle2D.Double(points[0], points[1],

                                                      points[2] - points[0],

                                                      points[3] - points[1]);

    Rectangle2D.intersect(deviceBounds, this.getClipInDevSpace(), deviceBounds);

    current = current.getSubimage((int)deviceBounds.getX(),

                                  (int)deviceBounds.getY(),

                                  (int)deviceBounds.getWidth(),

                                  (int)deviceBounds.getHeight());

    // Perform actual composite operation

    compCtx.compose(buffer2.getRaster(), current.getRaster(),

                    buffer2.getRaster());

    // This MUST call directly into the "action" method in CairoGraphics2D,

    // not one of the wrappers, to ensure that the composite isn't processed

    // more than once!

    Composite oldComp = comp;           // so that ComponentGraphics doesn't

    comp = null;                        // process the composite again

    boolean rv = super.drawImage(buffer2,

                           AffineTransform.getTranslateInstance(bounds.getX(),

                                                                bounds.getY()),

                           null, null);

    comp = oldComp;

    return rv;

  }

  private void createBuffer()

  {

    if (buffer == null)

      {

        WritableRaster rst;

        rst = Raster.createWritableRaster(GtkVolatileImage.createGdkSampleModel(owner.width,

                                                                  owner.height),

                                          new Point(0,0));

        buffer = new BufferedImage(GtkVolatileImage.gdkColorModel, rst,

                                   GtkVolatileImage.gdkColorModel.isAlphaPremultiplied(),

                                   new Hashtable());

      }

    else

      {

        Graphics2D g2d = ((Graphics2D)buffer.getGraphics());

        g2d.setBackground(new Color(0,0,0,0));

        g2d.clearRect(0, 0, buffer.getWidth(), buffer.getHeight());

      }

  }

  protected ColorModel getNativeCM()

  {

    // We should really return GtkVolatileImage.gdkColorModel ,

    // but CairoGraphics2D doesn't handle alpha premultiplication properly (see

    // the fixme in drawImage) so we use the naive Cairo model instead to trick

    // the compositing context.

    // Because getNativeCM() == getBufferCM() for this peer, it doesn't break.

    return CairoSurface.cairoCM_pre;

  }

}