gdkgraphics2d.java

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/* GdkGraphics2D.java --
   Copyright (C) 2003, 2004, 2005  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., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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 gnu.classpath.Configuration;
import gnu.java.awt.ClasspathToolkit;

import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.TexturePaint;
import java.awt.Toolkit;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.geom.AffineTransform;
import java.awt.geom.Arc2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.geom.PathIterator;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ColorModel;
import java.awt.image.CropImageFilter;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferInt;
import java.awt.image.DirectColorModel;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageObserver;
import java.awt.image.ImagingOpException;
import java.awt.image.MultiPixelPackedSampleModel;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.SampleModel;
import java.awt.image.WritableRaster;
import java.awt.image.renderable.RenderContext;
import java.awt.image.renderable.RenderableImage;
import java.text.AttributedCharacterIterator;
import java.util.HashMap;
import java.util.Map;
import java.util.Stack;

public class GdkGraphics2D extends Graphics2D
{
  //////////////////////////////////////
  ////// State Management Methods //////
  //////////////////////////////////////

  static 
  {
    if (Configuration.INIT_LOAD_LIBRARY)
      System.loadLibrary("gtkpeer");

    if (GtkToolkit.useGraphics2D())
      initStaticState();
  }
  
  static native void initStaticState();
  
  private final int native_state = GtkGenericPeer.getUniqueInteger();  

  private Paint paint;
  private Stroke stroke;
  private Color fg;
  private Color bg;
  private Shape clip;
  private AffineTransform transform;
  private GtkComponentPeer component;
  private Font font;
  private RenderingHints hints;
  private BufferedImage bimage;
  private boolean pixelConversionRequired;
  private int[] pixelBuffer;
  private Composite comp;
  private Stack stateStack;

  private native void initState(GtkComponentPeer component);
  private native void initState(int width, int height);
  private native void initState(int[] pixes, int width, int height);
  private native void copyState(GdkGraphics2D g);
  public native void dispose();
  private native void cairoSurfaceSetFilter(int filter);
  native void connectSignals(GtkComponentPeer component);

  public void finalize()
  {
    dispose();
  }

  public Graphics create()
  {
    return new GdkGraphics2D(this);
  }

  public Graphics create(int x, int y, int width, int height)
  {
    return new GdkGraphics2D(width, height);
  }

  GdkGraphics2D(GdkGraphics2D g)
  {
    paint = g.paint;
    stroke = g.stroke;
    setRenderingHints(g.hints);

    if (g.fg.getAlpha() != -1)
      fg = new Color(g.fg.getRed(), g.fg.getGreen(), g.fg.getBlue(),
                     g.fg.getAlpha());
    else
      fg = new Color(g.fg.getRGB());

    if (g.bg.getAlpha() != -1)
      bg = new Color(g.bg.getRed(), g.bg.getGreen(), g.bg.getBlue(),
                     g.bg.getAlpha());
    else
      bg = new Color(g.bg.getRGB());

    if (g.clip == null)
      clip = null;
    else
      clip = new Rectangle(g.getClipBounds());

    if (g.transform == null)
      transform = new AffineTransform();
    else
      transform = new AffineTransform(g.transform);

    font = g.font;
    component = g.component;
    copyState(g);

    setColor(fg);
    setBackground(bg);
    setPaint(paint);
    setStroke(stroke);
    setTransform(transform);
    setClip(clip);
    stateStack = new Stack();
  }

  GdkGraphics2D(int width, int height)
  {
    initState(width, height);

    setColor(Color.black);
    setBackground(Color.black);
    setPaint(getColor());
    setFont(new Font("SansSerif", Font.PLAIN, 12));
    setTransform(new AffineTransform());
    setStroke(new BasicStroke());
    setRenderingHints(getDefaultHints());

    stateStack = new Stack();
  }

  GdkGraphics2D(GtkComponentPeer component)
  {
    this.component = component;
    
    if (component.isRealized())
      initComponentGraphics2D();
    else
      connectSignals(component);
  }

  void initComponentGraphics2D()
  {
    initState(component);

    setColor(component.awtComponent.getForeground());
    setBackground(component.awtComponent.getBackground());
    setPaint(getColor());
    setTransform(new AffineTransform());
    setStroke(new BasicStroke());
    setRenderingHints(getDefaultHints());
    setFont(new Font("SansSerif", Font.PLAIN, 12));

    stateStack = new Stack();
  }

  GdkGraphics2D(BufferedImage bimage)
  {
    this.bimage = bimage;
    this.pixelBuffer = findSimpleIntegerArray(bimage.getColorModel(),
                                              bimage.getRaster());
    if (this.pixelBuffer == null)
      {
	this.pixelBuffer = new int[bimage.getRaster().getWidth() * bimage.getRaster()
	                                                                 .getHeight()];
	this.pixelConversionRequired = true;
      }
    else
      {
        this.pixelConversionRequired = false;
      }

    initState(this.pixelBuffer, bimage.getWidth(), bimage.getHeight());

    setColor(Color.black);
    setBackground(Color.black);
    setPaint(getColor());
    setFont(new Font("SansSerif", Font.PLAIN, 12));
    setTransform(new AffineTransform());
    setStroke(new BasicStroke());
    setRenderingHints(getDefaultHints());

    stateStack = new Stack();

    // draw current buffered image to the pixmap associated 
    // with it, if the image is not equal to our paint buffer.
    if (pixelConversionRequired)
      drawImage(bimage, new AffineTransform(1, 0, 0, 1, 0, 0), bg, null);
  }

  ////////////////////////////////////
  ////// Native Drawing Methods //////
  ////////////////////////////////////

  // GDK drawing methods
  private native void gdkDrawDrawable(GdkGraphics2D other, int x, int y);

  // drawing utility methods
  private native void drawPixels(int[] pixels, int w, int h, int stride,
                                 double[] i2u);
  private native void setTexturePixels(int[] pixels, int w, int h, int stride);
  private native void setGradient(double x1, double y1, double x2, double y2,
                                  int r1, int g1, int b1, int a1, int r2,
                                  int g2, int b2, int a2, boolean cyclic);

  // simple passthroughs to cairo
  private native void cairoSave();
  private native void cairoRestore();
  private native void cairoSetMatrix(double[] m);
  private native void cairoSetOperator(int cairoOperator);
  private native void cairoSetRGBColor(double red, double green, double blue);
  private native void cairoSetAlpha(double alpha);
  private native void cairoSetFillRule(int cairoFillRule);
  private native void cairoSetLineWidth(double width);
  private native void cairoSetLineCap(int cairoLineCap);
  private native void cairoSetLineJoin(int cairoLineJoin);
  private native void cairoSetDash(double[] dashes, int ndash, double offset);

  private native void cairoSetMiterLimit(double limit);
  private native void cairoNewPath();
  private native void cairoMoveTo(double x, double y);
  private native void cairoLineTo(double x, double y);
  private native void cairoCurveTo(double x1, double y1, double x2, double y2,
                                   double x3, double y3);
  private native void cairoRelMoveTo(double dx, double dy);
  private native void cairoRelLineTo(double dx, double dy);
  private native void cairoRelCurveTo(double dx1, double dy1, double dx2,
                                      double dy2, double dx3, double dy3);
  private native void cairoRectangle(double x, double y, double width,
                                     double height);
  private native void cairoClosePath();
  private native void cairoStroke();
  private native void cairoFill();
  private native void cairoClip();

  /////////////////////////////////////////////
  ////// General Drawing Support Methods //////
  /////////////////////////////////////////////

  private class DrawState
  {
    private Paint paint;
    private Stroke stroke;
    private Color fg;
    private Color bg;
    private Shape clip;
    private AffineTransform transform;
    private Font font;
    private Composite comp;

    DrawState(GdkGraphics2D g)
    {
      this.paint = g.paint;
      this.stroke = g.stroke;
      this.fg = g.fg;
      this.bg = g.bg;
      this.clip = g.clip;
      if (g.transform != null)
	this.transform = (AffineTransform) g.transform.clone();
      this.font = g.font;
      this.comp = g.comp;
    }

    public void restore(GdkGraphics2D g)
    {
      g.paint = this.paint;
      g.stroke = this.stroke;
      g.fg = this.fg;
      g.bg = this.bg;
      g.clip = this.clip;
      g.transform = this.transform;
      g.font = this.font;
      g.comp = this.comp;
    }
  }

  private void stateSave()
  {
    stateStack.push(new DrawState(this));
    cairoSave();
  }

  private void stateRestore()
  {
    ((DrawState) (stateStack.pop())).restore(this);
    cairoRestore();
  }

  // Some operations (drawing rather than filling) require that their
  // coords be shifted to land on 0.5-pixel boundaries, in order to land on
  // "middle of pixel" coordinates and light up complete pixels.
  private boolean shiftDrawCalls = false;

  private double shifted(double coord, boolean doShift)
  {
    if (doShift)
      return Math.floor(coord) + 0.5;
    else
      return coord;
  }

  private void walkPath(PathIterator p, boolean doShift)
  {
    double x = 0;
    double y = 0;
    double[] coords = new double[6];

    cairoSetFillRule(p.getWindingRule());
    for (; ! p.isDone(); p.next())
      {
	int seg = p.currentSegment(coords);
	switch (seg)
	  {
	  case PathIterator.SEG_MOVETO:
	    x = shifted(coords[0], doShift);
	    y = shifted(coords[1], doShift);
	    cairoMoveTo(x, y);
	    break;
	  case PathIterator.SEG_LINETO:
	    x = shifted(coords[0], doShift);
	    y = shifted(coords[1], doShift);
	    cairoLineTo(x, y);
	    break;
	  case PathIterator.SEG_QUADTO:
	    // splitting a quadratic bezier into a cubic:
	    // see: http://pfaedit.sourceforge.net/bezier.html
	    double x1 = x + (2.0 / 3.0) * (shifted(coords[0], doShift) - x);
	    double y1 = y + (2.0 / 3.0) * (shifted(coords[1], doShift) - y);

	    double x2 = x1 + (1.0 / 3.0) * (shifted(coords[2], doShift) - x);
	    double y2 = y1 + (1.0 / 3.0) * (shifted(coords[3], doShift) - y);

	    x = shifted(coords[2], doShift);
	    y = shifted(coords[3], doShift);
	    cairoCurveTo(x1, y1, x2, y2, x, y);
	    break;
	  case PathIterator.SEG_CUBICTO:
	    x = shifted(coords[4], doShift);
	    y = shifted(coords[5], doShift);
	    cairoCurveTo(shifted(coords[0], doShift),
	                 shifted(coords[1], doShift),
	                 shifted(coords[2], doShift),
	                 shifted(coords[3], doShift), x, y);
	    break;
	  case PathIterator.SEG_CLOSE:
	    cairoClosePath();
	    break;
	  }
      }
  }

  private Map getDefaultHints()
  {
    HashMap defaultHints = new HashMap();

    defaultHints.put(RenderingHints.KEY_TEXT_ANTIALIASING,
                     RenderingHints.VALUE_TEXT_ANTIALIAS_DEFAULT);

    defaultHints.put(RenderingHints.KEY_STROKE_CONTROL,
                     RenderingHints.VALUE_STROKE_DEFAULT);

    defaultHints.put(RenderingHints.KEY_FRACTIONALMETRICS,
                     RenderingHints.VALUE_FRACTIONALMETRICS_OFF);

    defaultHints.put(RenderingHints.KEY_ANTIALIASING,
                     RenderingHints.VALUE_ANTIALIAS_OFF);

    defaultHints.put(RenderingHints.KEY_RENDERING,
                     RenderingHints.VALUE_RENDER_DEFAULT);

    return defaultHints;
  }

  public static int[] findSimpleIntegerArray (ColorModel cm, Raster raster)
  {
    if (cm == null || raster == null)
      return null;

    if (! cm.getColorSpace().isCS_sRGB())
      return null;

    if (! (cm instanceof DirectColorModel))
      return null;

    DirectColorModel dcm = (DirectColorModel) cm;

    if (dcm.getRedMask() != 0x00FF0000 || dcm.getGreenMask() != 0x0000FF00
        || dcm.getBlueMask() != 0x000000FF)
      return null;

    if (! (raster instanceof WritableRaster))
      return null;

    if (raster.getSampleModel().getDataType() != DataBuffer.TYPE_INT)
      return null;

    if (! (raster.getDataBuffer() instanceof DataBufferInt))
      return null;

    DataBufferInt db = (DataBufferInt) raster.getDataBuffer();

    if (db.getNumBanks() != 1)
      return null;

    // Finally, we have determined that this is a single bank, [A]RGB-int
    // buffer in sRGB space. It's worth checking all this, because it means
    // that cairo can paint directly into the data buffer, which is very
    // fast compared to all the normal copying and converting.