gdkgraphics2d.java

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  }

  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.

    return db.getData();
  }

  private void updateBufferedImage()
  {
    if (bimage != null && pixelConversionRequired)
      {
        int height = bimage.getHeight();
        int width = bimage.getWidth();
        int index = 0;
        for (int y = 0; y < height; ++y)
          for (int x = 0; x < width; ++x)
            bimage.setRGB(x, y, pixelBuffer[index++]);
      }
  }

  private boolean drawImage(Image img, AffineTransform xform,
                            Color bgcolor, ImageObserver obs)
  {
    if (img == null)
      return false;

    // FIXME: I'll fix this, /Sven
//     if (img instanceof GtkOffScreenImage
//         && img.getGraphics() instanceof GdkGraphics2D
//         && (xform == null || xform.getType() == AffineTransform.TYPE_IDENTITY
//         || xform.getType() == AffineTransform.TYPE_TRANSLATION))
//       {
// 	// we are being asked to flush a double buffer from Gdk
// 	GdkGraphics2D g2 = (GdkGraphics2D) img.getGraphics();
// 	gdkDrawDrawable(g2, (int) xform.getTranslateX(),
// 	                (int) xform.getTranslateY());

// 	updateBufferedImage();

// 	return true;
//       }
//     else
      {
	// In this case, xform is an AffineTransform that transforms bounding
	// box of the specified image from image space to user space. However
	// when we pass this transform to cairo, cairo will use this transform
	// to map "user coordinates" to "pixel" coordinates, which is the 
	// other way around. Therefore to get the "user -> pixel" transform 
	// that cairo wants from "image -> user" transform that we currently
	// have, we will need to invert the transformation matrix.
	AffineTransform invertedXform = new AffineTransform();

	try
	  {
	    invertedXform = xform.createInverse();
	    if (img instanceof BufferedImage)
	      {
		// draw an image which has actually been loaded 
		// into memory fully
		BufferedImage b = (BufferedImage) img;
		return drawRaster(b.getColorModel(), b.getTile(0, 0),
		                  invertedXform, bgcolor);
	      }
	    else
	      return this.drawImage(GdkPixbufDecoder.createBufferedImage(img
	                                                                 .getSource()),
	                            xform, bgcolor, obs);
	  }
	catch (NoninvertibleTransformException e)
	  {
	    throw new ImagingOpException("Unable to invert transform "
	                                 + xform.toString());
	  }
      }
  }

  //////////////////////////////////////////////////
  ////// Implementation of Graphics2D Methods //////
  //////////////////////////////////////////////////

  public void draw(Shape s)
  {
    if (stroke != null && ! (stroke instanceof BasicStroke))
      {
	fill(stroke.createStrokedShape(s));
	return;
      }

    cairoNewPath();

    if (s instanceof Rectangle2D)
      {
	Rectangle2D r = (Rectangle2D) s;
	cairoRectangle(shifted(r.getX(), shiftDrawCalls),
	               shifted(r.getY(), shiftDrawCalls), r.getWidth(),
	               r.getHeight());
      }
    else
      walkPath(s.getPathIterator(null), shiftDrawCalls);
    cairoStroke();

    updateBufferedImage();
  }

  public void fill(Shape s)
  {
    cairoNewPath();
    if (s instanceof Rectangle2D)
      {
	Rectangle2D r = (Rectangle2D) s;
	cairoRectangle(r.getX(), r.getY(), r.getWidth(), r.getHeight());
      }
    else
      walkPath(s.getPathIterator(null), false);

    cairoFill();

    updateBufferedImage();
  }

  public void clip(Shape s)
  {
    // update it
    if (clip == null || s == null)
      clip = s;
    else if (s instanceof Rectangle2D && clip instanceof Rectangle2D)
      {
	Rectangle2D r = (Rectangle2D) s;
	Rectangle2D curr = (Rectangle2D) clip;
	clip = curr.createIntersection(r);
      }
    else
      throw new UnsupportedOperationException();

    // draw it
    if (clip != null)
      {
	cairoNewPath();
	if (clip instanceof Rectangle2D)
	  {
	    Rectangle2D r = (Rectangle2D) clip;
	    cairoRectangle(r.getX(), r.getY(), r.getWidth(), r.getHeight());
	  }
	else
	  walkPath(clip.getPathIterator(null), false);

	// cairoClosePath ();
	cairoClip();
      }
  }

  public Paint getPaint()
  {
    return paint;
  }

  public AffineTransform getTransform()
  {
    return (AffineTransform) transform.clone();
  }

  public void setPaint(Paint p)
  {
    if (paint == null)
      return;

    paint = p;
    if (paint instanceof Color)
      {
        setColor((Color) paint);
      }
    else if (paint instanceof TexturePaint)
      {
	TexturePaint tp = (TexturePaint) paint;
	BufferedImage img = tp.getImage();

	// map the image to the anchor rectangle  
	int width = (int) tp.getAnchorRect().getWidth();
	int height = (int) tp.getAnchorRect().getHeight();

	double scaleX = width / (double) img.getWidth();
	double scaleY = width / (double) img.getHeight();

	AffineTransform at = new AffineTransform(scaleX, 0, 0, scaleY, 0, 0);
	AffineTransformOp op = new AffineTransformOp(at, getRenderingHints());
	BufferedImage texture = op.filter(img, null);
	int[] pixels = texture.getRGB(0, 0, width, height, null, 0, width);
	setTexturePixels(pixels, width, height, width);
      }
    else if (paint instanceof GradientPaint)
      {
	GradientPaint gp = (GradientPaint) paint;
	Point2D p1 = gp.getPoint1();
	Point2D p2 = gp.getPoint2();
	Color c1 = gp.getColor1();
	Color c2 = gp.getColor2();
	setGradient(p1.getX(), p1.getY(), p2.getX(), p2.getY(), c1.getRed(),
	            c1.getGreen(), c1.getBlue(), c1.getAlpha(), c2.getRed(),
	            c2.getGreen(), c2.getBlue(), c2.getAlpha(), gp.isCyclic());
      }
    else
      throw new java.lang.UnsupportedOperationException();
  }

  public void setPaintUnlocked(Paint p)
  {
    if (paint == null)
      return;

    paint = p;
    if (paint instanceof Color)
      {
        setColorUnlocked((Color) paint);
      }
    else if (paint instanceof TexturePaint)
      {
	TexturePaint tp = (TexturePaint) paint;
	BufferedImage img = tp.getImage();

	// map the image to the anchor rectangle  
	int width = (int) tp.getAnchorRect().getWidth();
	int height = (int) tp.getAnchorRect().getHeight();

	double scaleX = width / (double) img.getWidth();
	double scaleY = width / (double) img.getHeight();

	AffineTransform at = new AffineTransform(scaleX, 0, 0, scaleY, 0, 0);
	AffineTransformOp op = new AffineTransformOp(at, getRenderingHints());
	BufferedImage texture = op.filter(img, null);
	int[] pixels = texture.getRGB(0, 0, width, height, null, 0, width);
	setTexturePixelsUnlocked(pixels, width, height, width);
      }
    else if (paint instanceof GradientPaint)
      {
	GradientPaint gp = (GradientPaint) paint;
	Point2D p1 = gp.getPoint1();
	Point2D p2 = gp.getPoint2();
	Color c1 = gp.getColor1();
	Color c2 = gp.getColor2();
	setGradientUnlocked(p1.getX(), p1.getY(), p2.getX(), p2.getY(), c1.getRed(),
	            c1.getGreen(), c1.getBlue(), c1.getAlpha(), c2.getRed(),
	            c2.getGreen(), c2.getBlue(), c2.getAlpha(), gp.isCyclic());
      }
    else
      throw new java.lang.UnsupportedOperationException();
  }

  public void setTransform(AffineTransform tx)
  {
    transform = tx;
    if (transform != null)
      {
	double[] m = new double[6];
	transform.getMatrix(m);
	cairoSetMatrix(m);
      }
  }

  public void setTransformUnlocked(AffineTransform tx)
  {
    transform = tx;
    if (transform != null)
      {
	double[] m = new double[6];
	transform.getMatrix(m);
	cairoSetMatrixUnlocked(m);
      }
  }

  public void transform(AffineTransform tx)
  {
    if (transform == null)
      transform = new AffineTransform(tx);
    else
      transform.concatenate(tx);
    setTransform(transform);
    if (clip != null)
      {
	// FIXME: this should actuall try to transform the shape
	// rather than degrade to bounds.
	Rectangle2D r = clip.getBounds2D();
	double[] coords = new double[]
	                  {
	                    r.getX(), r.getY(), r.getX() + r.getWidth(),
	                    r.getY() + r.getHeight()
	                  };
	try
	  {
	    tx.createInverse().transform(coords, 0, coords, 0, 2);
	    r.setRect(coords[0], coords[1], coords[2] - coords[0],
	              coords[3] - coords[1]);
	    clip = r;
	  }