/*
    * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.
    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    *
    * This code is free software; you can redistribute it and/or modify it
    * under the terms of the GNU General Public License version 2 only, as
    * published by the Free Software Foundation.  Oracle designates this
    * particular file as subject to the "Classpath" exception as provided
    * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code 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
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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   */
  
  package sun.print;
  
  import java.lang.ref.SoftReference;
  import java.util.Hashtable;
  import sun.font.CharToGlyphMapper;
  import sun.font.CompositeFont;
  import sun.font.Font2D;
  import sun.font.Font2DHandle;
  import sun.font.FontManager;
  import sun.font.FontManagerFactory;
  import sun.font.FontUtilities;
  
  import java.awt.Color;
  import java.awt.Font;
  import java.awt.Graphics2D;
  import java.awt.Image;
  import java.awt.Paint;
  import java.awt.Polygon;
  import java.awt.Shape;
  
  import java.text.AttributedCharacterIterator;
  
  import java.awt.font.FontRenderContext;
  import java.awt.font.GlyphVector;
  import java.awt.font.TextAttribute;
  import java.awt.font.TextLayout;
  
  import java.awt.geom.AffineTransform;
  import java.awt.geom.Arc2D;
  import java.awt.geom.Ellipse2D;
  import java.awt.geom.Line2D;
  import java.awt.geom.Point2D;
  import java.awt.geom.Rectangle2D;
  import java.awt.geom.RoundRectangle2D;
  import java.awt.geom.PathIterator;
  
  import java.awt.image.BufferedImage;
  import java.awt.image.BufferedImageOp;
  import java.awt.image.ColorModel;
  import java.awt.image.DataBuffer;
  import java.awt.image.DataBufferInt;
  import java.awt.image.ImageObserver;
  import java.awt.image.IndexColorModel;
  import java.awt.image.Raster;
  import java.awt.image.RenderedImage;
  import java.awt.image.SampleModel;
  import java.awt.image.SinglePixelPackedSampleModel;
  import java.awt.image.VolatileImage;
  import sun.awt.image.ByteComponentRaster;
  import sun.awt.image.ToolkitImage;
  import sun.awt.image.SunWritableRaster;
  
  import java.awt.print.PageFormat;
  import java.awt.print.Printable;
  import java.awt.print.PrinterException;
  import java.awt.print.PrinterGraphics;
  import java.awt.print.PrinterJob;
  
  import java.util.Map;
  
  public abstract class PathGraphics extends ProxyGraphics2D {
  
      private Printable mPainter;
      private PageFormat mPageFormat;
      private int mPageIndex;
      private boolean mCanRedraw;
      protected boolean printingGlyphVector;
  
      protected PathGraphics(Graphics2D graphics, PrinterJob printerJob,
                             Printable painter, PageFormat pageFormat,
                             int pageIndex, boolean canRedraw) {
          super(graphics, printerJob);
  
          mPainter = painter;
         mPageFormat = pageFormat;
         mPageIndex = pageIndex;
         mCanRedraw = canRedraw;
     }
 
     /**
      * Return the Printable instance responsible for drawing
      * into this Graphics.
      */
     protected Printable getPrintable() {
         return mPainter;
     }
 
     /**
      * Return the PageFormat associated with this page of
      * Graphics.
      */
     protected PageFormat getPageFormat() {
         return mPageFormat;
     }
 
     /**
      * Return the page index associated with this Graphics.
      */
     protected int getPageIndex() {
         return mPageIndex;
     }
 
     /**
      * Return true if we are allowed to ask the application
      * to redraw portions of the page. In general, with the
      * PrinterJob API, the application can be asked to do a
      * redraw. When PrinterJob is emulating PrintJob then we
      * can not.
      */
     public boolean canDoRedraws() {
         return mCanRedraw;
     }
 
      /**
       * Redraw a rectanglular area using a proxy graphics
       */
     public abstract void redrawRegion(Rectangle2D region,
                                       double scaleX, double scaleY,
                                       Shape clip,
                                       AffineTransform devTransform)
 
                     throws PrinterException ;
 
     /**
      * Draws a line, using the current color, between the points
      * <code>(x1,&nbsp;y1)</code> and <code>(x2,&nbsp;y2)</code>
      * in this graphics context's coordinate system.
      * @param   x1  the first point's <i>x</i> coordinate.
      * @param   y1  the first point's <i>y</i> coordinate.
      * @param   x2  the second point's <i>x</i> coordinate.
      * @param   y2  the second point's <i>y</i> coordinate.
      */
     public void drawLine(int x1, int y1, int x2, int y2) {
 
         Paint paint = getPaint();
 
         try {
             AffineTransform deviceTransform = getTransform();
             if (getClip() != null) {
                 deviceClip(getClip().getPathIterator(deviceTransform));
             }
 
             deviceDrawLine(x1, y1, x2, y2, (Color) paint);
 
         } catch (ClassCastException e) {
             throw new IllegalArgumentException("Expected a Color instance");
         }
     }
 
 
     /**
      * Draws the outline of the specified rectangle.
      * The left and right edges of the rectangle are at
      * <code>x</code> and <code>x&nbsp;+&nbsp;width</code>.
      * The top and bottom edges are at
      * <code>y</code> and <code>y&nbsp;+&nbsp;height</code>.
      * The rectangle is drawn using the graphics context's current color.
      * @param         x   the <i>x</i> coordinate
      *                         of the rectangle to be drawn.
      * @param         y   the <i>y</i> coordinate
      *                         of the rectangle to be drawn.
      * @param         width   the width of the rectangle to be drawn.
      * @param         height   the height of the rectangle to be drawn.
      * @see          java.awt.Graphics#fillRect
      * @see          java.awt.Graphics#clearRect
      */
     public void drawRect(int x, int y, int width, int height) {
 
         Paint paint = getPaint();
 
         try {
             AffineTransform deviceTransform = getTransform();
             if (getClip() != null) {
                 deviceClip(getClip().getPathIterator(deviceTransform));
             }
 
             deviceFrameRect(x, y, width, height, (Color) paint);
 
         } catch (ClassCastException e) {
             throw new IllegalArgumentException("Expected a Color instance");
         }
 
     }
 
     /**
      * Fills the specified rectangle.
      * The left and right edges of the rectangle are at
      * <code>x</code> and <code>x&nbsp;+&nbsp;width&nbsp;-&nbsp;1</code>.
      * The top and bottom edges are at
      * <code>y</code> and <code>y&nbsp;+&nbsp;height&nbsp;-&nbsp;1</code>.
      * The resulting rectangle covers an area
      * <code>width</code> pixels wide by
      * <code>height</code> pixels tall.
      * The rectangle is filled using the graphics context's current color.
      * @param         x   the <i>x</i> coordinate
      *                         of the rectangle to be filled.
      * @param         y   the <i>y</i> coordinate
      *                         of the rectangle to be filled.
      * @param         width   the width of the rectangle to be filled.
      * @param         height   the height of the rectangle to be filled.
      * @see           java.awt.Graphics#clearRect
      * @see           java.awt.Graphics#drawRect
      */
     public void fillRect(int x, int y, int width, int height){
 
         Paint paint = getPaint();
 
         try {
             AffineTransform deviceTransform = getTransform();
             if (getClip() != null) {
                 deviceClip(getClip().getPathIterator(deviceTransform));
             }
 
             deviceFillRect(x, y, width, height, (Color) paint);
 
         } catch (ClassCastException e) {
             throw new IllegalArgumentException("Expected a Color instance");
         }
     }
 
        /**
      * Clears the specified rectangle by filling it with the background
      * color of the current drawing surface. This operation does not
      * use the current paint mode.
      * <p>
      * Beginning with Java&nbsp;1.1, the background color
      * of offscreen images may be system dependent. Applications should
      * use <code>setColor</code> followed by <code>fillRect</code> to
      * ensure that an offscreen image is cleared to a specific color.
      * @param       x the <i>x</i> coordinate of the rectangle to clear.
      * @param       y the <i>y</i> coordinate of the rectangle to clear.
      * @param       width the width of the rectangle to clear.
      * @param       height the height of the rectangle to clear.
      * @see         java.awt.Graphics#fillRect(int, int, int, int)
      * @see         java.awt.Graphics#drawRect
      * @see         java.awt.Graphics#setColor(java.awt.Color)
      * @see         java.awt.Graphics#setPaintMode
      * @see         java.awt.Graphics#setXORMode(java.awt.Color)
      */
     public void clearRect(int x, int y, int width, int height) {
 
         fill(new Rectangle2D.Float(x, y, width, height), getBackground());
     }
 
         /**
      * Draws an outlined round-cornered rectangle using this graphics
      * context's current color. The left and right edges of the rectangle
      * are at <code>x</code> and <code>x&nbsp;+&nbsp;width</code>,
      * respectively. The top and bottom edges of the rectangle are at
      * <code>y</code> and <code>y&nbsp;+&nbsp;height</code>.
      * @param      x the <i>x</i> coordinate of the rectangle to be drawn.
      * @param      y the <i>y</i> coordinate of the rectangle to be drawn.
      * @param      width the width of the rectangle to be drawn.
      * @param      height the height of the rectangle to be drawn.
      * @param      arcWidth the horizontal diameter of the arc
      *                    at the four corners.
      * @param      arcHeight the vertical diameter of the arc
      *                    at the four corners.
      * @see        java.awt.Graphics#fillRoundRect
      */
     public void drawRoundRect(int x, int y, int width, int height,
                               int arcWidth, int arcHeight) {
 
         draw(new RoundRectangle2D.Float(x, y,
                                         width, height,
                                         arcWidth, arcHeight));
     }
 
 
     /**
      * Fills the specified rounded corner rectangle with the current color.
      * The left and right edges of the rectangle
      * are at <code>x</code> and <code>x&nbsp;+&nbsp;width&nbsp;-&nbsp;1</code>,
      * respectively. The top and bottom edges of the rectangle are at
      * <code>y</code> and <code>y&nbsp;+&nbsp;height&nbsp;-&nbsp;1</code>.
      * @param       x the <i>x</i> coordinate of the rectangle to be filled.
      * @param       y the <i>y</i> coordinate of the rectangle to be filled.
      * @param       width the width of the rectangle to be filled.
      * @param       height the height of the rectangle to be filled.
      * @param       arcWidth the horizontal diameter
      *                     of the arc at the four corners.
      * @param       arcHeight the vertical diameter
      *                     of the arc at the four corners.
      * @see         java.awt.Graphics#drawRoundRect
      */
     public void fillRoundRect(int x, int y, int width, int height,
                               int arcWidth, int arcHeight) {
 
         fill(new RoundRectangle2D.Float(x, y,
                                         width, height,
                                         arcWidth, arcHeight));
     }
 
     /**
      * Draws the outline of an oval.
      * The result is a circle or ellipse that fits within the
      * rectangle specified by the <code>x</code>, <code>y</code>,
      * <code>width</code>, and <code>height</code> arguments.
      * <p>
      * The oval covers an area that is
      * <code>width&nbsp;+&nbsp;1</code> pixels wide
      * and <code>height&nbsp;+&nbsp;1</code> pixels tall.
      * @param       x the <i>x</i> coordinate of the upper left
      *                     corner of the oval to be drawn.
      * @param       y the <i>y</i> coordinate of the upper left
      *                     corner of the oval to be drawn.
      * @param       width the width of the oval to be drawn.
      * @param       height the height of the oval to be drawn.
      * @see         java.awt.Graphics#fillOval
      * @since       JDK1.0
      */
     public void drawOval(int x, int y, int width, int height) {
         draw(new Ellipse2D.Float(x, y, width, height));
     }
 
         /**
      * Fills an oval bounded by the specified rectangle with the
      * current color.
      * @param       x the <i>x</i> coordinate of the upper left corner
      *                     of the oval to be filled.
      * @param       y the <i>y</i> coordinate of the upper left corner
      *                     of the oval to be filled.
      * @param       width the width of the oval to be filled.
      * @param       height the height of the oval to be filled.
      * @see         java.awt.Graphics#drawOval
      */
     public void fillOval(int x, int y, int width, int height){
 
         fill(new Ellipse2D.Float(x, y, width, height));
     }
 
     /**
      * Draws the outline of a circular or elliptical arc
      * covering the specified rectangle.
      * <p>
      * The resulting arc begins at <code>startAngle</code> and extends
      * for <code>arcAngle</code> degrees, using the current color.
      * Angles are interpreted such that 0&nbsp;degrees
      * is at the 3&nbsp;o'clock position.
      * A positive value indicates a counter-clockwise rotation
      * while a negative value indicates a clockwise rotation.
      * <p>
      * The center of the arc is the center of the rectangle whose origin
      * is (<i>x</i>,&nbsp;<i>y</i>) and whose size is specified by the
      * <code>width</code> and <code>height</code> arguments.
      * <p>
      * The resulting arc covers an area
      * <code>width&nbsp;+&nbsp;1</code> pixels wide
      * by <code>height&nbsp;+&nbsp;1</code> pixels tall.
      * <p>
      * The angles are specified relative to the non-square extents of
      * the bounding rectangle such that 45 degrees always falls on the
      * line from the center of the ellipse to the upper right corner of
      * the bounding rectangle. As a result, if the bounding rectangle is
      * noticeably longer in one axis than the other, the angles to the
      * start and end of the arc segment will be skewed farther along the
      * longer axis of the bounds.
      * @param        x the <i>x</i> coordinate of the
      *                    upper-left corner of the arc to be drawn.
      * @param        y the <i>y</i>  coordinate of the
      *                    upper-left corner of the arc to be drawn.
      * @param        width the width of the arc to be drawn.
      * @param        height the height of the arc to be drawn.
      * @param        startAngle the beginning angle.
      * @param        arcAngle the angular extent of the arc,
      *                    relative to the start angle.
      * @see         java.awt.Graphics#fillArc
      */
     public void drawArc(int x, int y, int width, int height,
                                  int startAngle, int arcAngle) {
         draw(new Arc2D.Float(x, y, width, height,
                              startAngle, arcAngle,
                              Arc2D.OPEN));
     }
 
 
     /**
      * Fills a circular or elliptical arc covering the specified rectangle.
      * <p>
      * The resulting arc begins at <code>startAngle</code> and extends
      * for <code>arcAngle</code> degrees.
      * Angles are interpreted such that 0&nbsp;degrees
      * is at the 3&nbsp;o'clock position.
      * A positive value indicates a counter-clockwise rotation
      * while a negative value indicates a clockwise rotation.
      * <p>
      * The center of the arc is the center of the rectangle whose origin
      * is (<i>x</i>,&nbsp;<i>y</i>) and whose size is specified by the
      * <code>width</code> and <code>height</code> arguments.
      * <p>
      * The resulting arc covers an area
      * <code>width&nbsp;+&nbsp;1</code> pixels wide
      * by <code>height&nbsp;+&nbsp;1</code> pixels tall.
      * <p>
      * The angles are specified relative to the non-square extents of
      * the bounding rectangle such that 45 degrees always falls on the
      * line from the center of the ellipse to the upper right corner of
      * the bounding rectangle. As a result, if the bounding rectangle is
      * noticeably longer in one axis than the other, the angles to the
      * start and end of the arc segment will be skewed farther along the
      * longer axis of the bounds.
      * @param        x the <i>x</i> coordinate of the
      *                    upper-left corner of the arc to be filled.
      * @param        y the <i>y</i>  coordinate of the
      *                    upper-left corner of the arc to be filled.
      * @param        width the width of the arc to be filled.
      * @param        height the height of the arc to be filled.
      * @param        startAngle the beginning angle.
      * @param        arcAngle the angular extent of the arc,
      *                    relative to the start angle.
      * @see         java.awt.Graphics#drawArc
      */
     public void fillArc(int x, int y, int width, int height,
                                  int startAngle, int arcAngle) {
 
         fill(new Arc2D.Float(x, y, width, height,
                              startAngle, arcAngle,
                              Arc2D.PIE));
     }
 
     /**
      * Draws a sequence of connected lines defined by
      * arrays of <i>x</i> and <i>y</i> coordinates.
      * Each pair of (<i>x</i>,&nbsp;<i>y</i>) coordinates defines a point.
      * The figure is not closed if the first point
      * differs from the last point.
      * @param       xPoints an array of <i>x</i> points
      * @param       yPoints an array of <i>y</i> points
      * @param       nPoints the total number of points
      * @see         java.awt.Graphics#drawPolygon(int[], int[], int)
      * @since       JDK1.1
      */
     public void drawPolyline(int xPoints[], int yPoints[],
                              int nPoints) {
         float fromX;
         float fromY;
         float toX;
         float toY;
 
         if (nPoints > 0) {
             fromX = xPoints[0];
             fromY = yPoints[0];
             for(int i = 1; i < nPoints; i++) {
                 toX = xPoints[i];
                 toY = yPoints[i];
                 draw(new Line2D.Float(fromX, fromY, toX, toY));
                 fromX = toX;
                 fromY = toY;
             }
         }
 
     }
 
 
     /**
      * Draws a closed polygon defined by
      * arrays of <i>x</i> and <i>y</i> coordinates.
      * Each pair of (<i>x</i>,&nbsp;<i>y</i>) coordinates defines a point.
      * <p>
      * This method draws the polygon defined by <code>nPoint</code> line
      * segments, where the first <code>nPoint&nbsp;-&nbsp;1</code>
      * line segments are line segments from
      * <code>(xPoints[i&nbsp;-&nbsp;1],&nbsp;yPoints[i&nbsp;-&nbsp;1])</code>
      * to <code>(xPoints[i],&nbsp;yPoints[i])</code>, for
      * 1&nbsp;&le;&nbsp;<i>i</i>&nbsp;&le;&nbsp;<code>nPoints</code>.
      * The figure is automatically closed by drawing a line connecting
      * the final point to the first point, if those points are different.
      * @param        xPoints   a an array of <code>x</code> coordinates.
      * @param        yPoints   a an array of <code>y</code> coordinates.
      * @param        nPoints   a the total number of points.
      * @see          java.awt.Graphics#fillPolygon
      * @see          java.awt.Graphics#drawPolyline
      */
     public void drawPolygon(int xPoints[], int yPoints[],
                                      int nPoints) {
 
         draw(new Polygon(xPoints, yPoints, nPoints));
     }
 
     /**
      * Draws the outline of a polygon defined by the specified
      * <code>Polygon</code> object.
      * @param        p the polygon to draw.
      * @see          java.awt.Graphics#fillPolygon
      * @see          java.awt.Graphics#drawPolyline
      */
     public void drawPolygon(Polygon p) {
         draw(p);
     }
 
      /**
      * Fills a closed polygon defined by
      * arrays of <i>x</i> and <i>y</i> coordinates.
      * <p>
      * This method draws the polygon defined by <code>nPoint</code> line
      * segments, where the first <code>nPoint&nbsp;-&nbsp;1</code>
      * line segments are line segments from
      * <code>(xPoints[i&nbsp;-&nbsp;1],&nbsp;yPoints[i&nbsp;-&nbsp;1])</code>
      * to <code>(xPoints[i],&nbsp;yPoints[i])</code>, for
      * 1&nbsp;&le;&nbsp;<i>i</i>&nbsp;&le;&nbsp;<code>nPoints</code>.
      * The figure is automatically closed by drawing a line connecting
      * the final point to the first point, if those points are different.
      * <p>
      * The area inside the polygon is defined using an
      * even-odd fill rule, also known as the alternating rule.
      * @param        xPoints   a an array of <code>x</code> coordinates.
      * @param        yPoints   a an array of <code>y</code> coordinates.
      * @param        nPoints   a the total number of points.
      * @see          java.awt.Graphics#drawPolygon(int[], int[], int)
      */
     public void fillPolygon(int xPoints[], int yPoints[],
                             int nPoints) {
 
         fill(new Polygon(xPoints, yPoints, nPoints));
     }
 
 
     /**
      * Fills the polygon defined by the specified Polygon object with
      * the graphics context's current color.
      * <p>
      * The area inside the polygon is defined using an
      * even-odd fill rule, also known as the alternating rule.
      * @param        p the polygon to fill.
      * @see          java.awt.Graphics#drawPolygon(int[], int[], int)
      */
     public void fillPolygon(Polygon p) {
 
         fill(p);
     }
 
     /**
      * Draws the text given by the specified string, using this
      * graphics context's current font and color. The baseline of the
      * first character is at position (<i>x</i>,&nbsp;<i>y</i>) in this
      * graphics context's coordinate system.
      * @param       str      the string to be drawn.
      * @param       x        the <i>x</i> coordinate.
      * @param       y        the <i>y</i> coordinate.
      * @see         java.awt.Graphics#drawBytes
      * @see         java.awt.Graphics#drawChars
      * @since       JDK1.0
      */
     public void drawString(String str, int x, int y) {
         drawString(str, (float) x, (float) y);
     }
 
     public void drawString(String str, float x, float y) {
         if (str.length() == 0) {
             return;
         }
         TextLayout layout =
             new TextLayout(str, getFont(), getFontRenderContext());
         layout.draw(this, x, y);
     }
 
     protected void drawString(String str, float x, float y,
                               Font font, FontRenderContext frc, float w) {
         TextLayout layout =
             new TextLayout(str, font, frc);
         Shape textShape =
             layout.getOutline(AffineTransform.getTranslateInstance(x, y));
         fill(textShape);
     }
 
     /**
      * Draws the text given by the specified iterator, using this
      * graphics context's current color. The iterator has to specify a font
      * for each character. The baseline of the
      * first character is at position (<i>x</i>,&nbsp;<i>y</i>) in this
      * graphics context's coordinate system.
      * @param       iterator the iterator whose text is to be drawn
      * @param       x        the <i>x</i> coordinate.
      * @param       y        the <i>y</i> coordinate.
      * @see         java.awt.Graphics#drawBytes
      * @see         java.awt.Graphics#drawChars
      */
     public void drawString(AttributedCharacterIterator iterator,
                            int x, int y) {
         drawString(iterator, (float) x, (float) y);
     }
     public void drawString(AttributedCharacterIterator iterator,
                            float x, float y) {
         if (iterator == null) {
             throw
                 new NullPointerException("attributedcharacteriterator is null");
         }
         TextLayout layout =
             new TextLayout(iterator, getFontRenderContext());
         layout.draw(this, x, y);
     }
 
     /**
      * Draws a GlyphVector.
      * The rendering attributes applied include the clip, transform,
      * paint or color, and composite attributes.  The GlyphVector specifies
      * individual glyphs from a Font.
      * @param g The GlyphVector to be drawn.
      * @param x,y The coordinates where the glyphs should be drawn.
      * @see #setPaint
      * @see java.awt.Graphics#setColor
      * @see #transform
      * @see #setTransform
      * @see #setComposite
      * @see #clip
      * @see #setClip
      */
     public void drawGlyphVector(GlyphVector g,
                                 float x,
                                 float y) {
 
         /* We should not reach here if printingGlyphVector is already true.
          * Add an assert so this can be tested if need be.
          * But also ensure that we do at least render properly by filling
          * the outline.
          */
         if (printingGlyphVector) {
             assert !printingGlyphVector; // ie false.
             fill(g.getOutline(x, y));
             return;
         }
 
         try {
             printingGlyphVector = true;
             if (RasterPrinterJob.shapeTextProp ||
                 !printedSimpleGlyphVector(g, x, y)) {
                 fill(g.getOutline(x, y));
             }
         } finally {
             printingGlyphVector = false;
         }
     }
 
     protected static SoftReference<Hashtable<Font2DHandle,Object>>
         fontMapRef = new SoftReference<Hashtable<Font2DHandle,Object>>(null);
 
     protected int platformFontCount(Font font, String str) {
         return 0;
     }
 
     /**
      * Default implementation returns false.
      * Callers of this method must always be prepared for this,
      * and delegate to outlines or some other solution.
      */
     protected boolean printGlyphVector(GlyphVector gv, float x, float y) {
         return false;
     }
 
     /* GlyphVectors are usually encountered because TextLayout is in use.
      * Some times TextLayout is needed to handle complex text or some
      * rendering attributes trigger it.
      * We try to print GlyphVectors by reconstituting into a String,
      * as that is most recoverable for applications that export to formats
      * such as Postscript or PDF. In some cases (eg where its not complex
      * text and its just that positions aren't what we'd expect) we print
      * one character at a time. positioning individually.
      * Failing that, if we can directly send glyph codes to the printer
      * then we do that (printGlyphVector).
      * As a last resort we return false and let the caller print as filled
      * shapes.
      */
     boolean printedSimpleGlyphVector(GlyphVector g, float x, float y) {
 
         int flags = g.getLayoutFlags();
 
         /* We can't handle RTL, re-ordering, complex glyphs etc by
          * reconstituting glyphs into a String. So if any flags besides
          * position adjustments are set, see if we can directly
          * print the GlyphVector as glyph codes, using the positions
          * layout has assigned. If that fails return false;
          */
         if (flags != 0 && flags != GlyphVector.FLAG_HAS_POSITION_ADJUSTMENTS) {
             return printGlyphVector(g, x, y);
         }
 
         Font font = g.getFont();
         Font2D font2D = FontUtilities.getFont2D(font);
         if (font2D.handle.font2D != font2D) {
             /* suspicious, may be a bad font. lets bail */
             return false;
         }
         Hashtable<Font2DHandle,Object> fontMap;
         synchronized (PathGraphics.class) {
             fontMap = fontMapRef.get();
             if (fontMap == null) {
                 fontMap = new Hashtable<Font2DHandle,Object>();
                 fontMapRef =
                     new SoftReference<Hashtable<Font2DHandle,Object>>(fontMap);
             }
         }
 
         int numGlyphs = g.getNumGlyphs();
         int[] glyphCodes = g.getGlyphCodes(0, numGlyphs, null);
 
         char[] glyphToCharMap = null;
         char[][] mapArray = null;
         CompositeFont cf = null;
 
         /* Build the needed maps for this font in a synchronized block */
         synchronized (fontMap) {
             if (font2D instanceof CompositeFont) {
                 cf = (CompositeFont)font2D;
                 int numSlots = cf.getNumSlots();
                 mapArray = (char[][])fontMap.get(font2D.handle);
                 if (mapArray == null) {
                     mapArray = new char[numSlots][];
                     fontMap.put(font2D.handle, mapArray);
                 }
                 for (int i=0; i<numGlyphs;i++) {
                     int slot = glyphCodes[i] >>> 24;
                     if (slot >= numSlots) { /* shouldn't happen */
                         return false;
                     }
                     if (mapArray[slot] == null) {
                         Font2D slotFont = cf.getSlotFont(slot);
                         char[] map = (char[])fontMap.get(slotFont.handle);
                         if (map == null) {
                             map = getGlyphToCharMapForFont(slotFont);
                         }
                         mapArray[slot] = map;
                     }
                 }
             } else {
                 glyphToCharMap = (char[])fontMap.get(font2D.handle);
                 if (glyphToCharMap == null) {
                     glyphToCharMap = getGlyphToCharMapForFont(font2D);
                     fontMap.put(font2D.handle, glyphToCharMap);
                 }
             }
         }
 
         char[] chars = new char[numGlyphs];
         if (cf != null) {
             for (int i=0; i<numGlyphs; i++) {
                 int gc = glyphCodes[i];
                 char[] map = mapArray[gc >>> 24];
                 gc = gc & 0xffffff;
                 if (map == null) {
                     return false;
                 }
                 /* X11 symbol & dingbats fonts used only for global metrics,
                  * so the glyph codes we have really refer to Lucida Sans
                  * Regular.
                  * So its possible the glyph code may appear out of range.
                  * Note that later on we double-check the glyph codes that
                  * we get from re-creating the GV from the string are the
                  * same as those we started with.
                  *
                  * If the glyphcode is INVISIBLE_GLYPH_ID then this may
                  * be \t, \n or \r which are mapped to that by layout.
                  * This is a case we can handle. It doesn't matter what
                  * character we use (we use \n) so long as layout maps it
                  * back to this in the verification, since the invisible
                  * glyph isn't visible :)
                  */
                 char ch;
                 if (gc == CharToGlyphMapper.INVISIBLE_GLYPH_ID) {
                     ch = '\n';
                 } else if (gc < 0 || gc >= map.length) {
                     return false;
                 } else {
                     ch = map[gc];
                 }
                 if (ch != CharToGlyphMapper.INVISIBLE_GLYPH_ID) {
                     chars[i] = ch;
                 } else {
                     return false;
                 }
             }
         } else {
             for (int i=0; i<numGlyphs; i++) {
                 int gc = glyphCodes[i];
                 char ch;
                 if (gc == CharToGlyphMapper.INVISIBLE_GLYPH_ID) {
                     ch = '\n';
                 } else if (gc < 0 || gc >= glyphToCharMap.length) {
                     return false;
                 } else {
                     ch = glyphToCharMap[gc];
                 }
                 if (ch != CharToGlyphMapper.INVISIBLE_GLYPH_ID) {
                     chars[i] = ch;
                 } else {
                     return false;
                 }
             }
         }
 
         FontRenderContext gvFrc = g.getFontRenderContext();
         GlyphVector gv2 = font.createGlyphVector(gvFrc, chars);
         if (gv2.getNumGlyphs() != numGlyphs) {
             return printGlyphVector(g, x, y);
         }
         int[] glyphCodes2 = gv2.getGlyphCodes(0, numGlyphs, null);
         /*
          * Needed to double-check remapping of X11 symbol & dingbats.
          */
         for (int i=0; i<numGlyphs; i++) {
             if (glyphCodes[i] != glyphCodes2[i]) {
                 return printGlyphVector(g, x, y);
             }
         }
 
         FontRenderContext g2dFrc = getFontRenderContext();
         boolean compatibleFRC = gvFrc.equals(g2dFrc);
         /* If differ only in specifying A-A or a translation, these are
          * also compatible FRC's, and we can do one drawString call.
          */
         if (!compatibleFRC &&
             gvFrc.usesFractionalMetrics() == g2dFrc.usesFractionalMetrics()) {
             AffineTransform gvAT = gvFrc.getTransform();
             AffineTransform g2dAT = getTransform();
             double[] gvMatrix = new double[4];
             double[] g2dMatrix = new double[4];
             gvAT.getMatrix(gvMatrix);
             g2dAT.getMatrix(g2dMatrix);
             compatibleFRC = true;
             for (int i=0;i<4;i++) {
                 if (gvMatrix[i] != g2dMatrix[i]) {
                     compatibleFRC = false;
                     break;
                 }
             }
         }
 
         String str = new String(chars, 0, numGlyphs);
         int numFonts = platformFontCount(font, str);
         if (numFonts == 0) {
             return false;
         }
 
         float[] positions = g.getGlyphPositions(0, numGlyphs, null);
         boolean noPositionAdjustments =
             ((flags & GlyphVector.FLAG_HAS_POSITION_ADJUSTMENTS) == 0) ||
             samePositions(gv2, glyphCodes2, glyphCodes, positions);
 
         /* We have to consider that the application may be directly
          * creating a GlyphVector, rather than one being created by
          * TextLayout or indirectly from drawString. In such a case, if the
          * font has layout attributes, the text may measure differently
          * when we reconstitute it into a String and ask for the length that
          * drawString would use. For example, KERNING will be applied in such
          * a case but that Font attribute is not applied when the application
          * directly created a GlyphVector. So in this case we need to verify
          * that the text measures the same in both cases - ie that the
          * layout attribute has no effect. If it does we can't always
          * use the drawString call unless we can coerce the drawString call
          * into measuring and displaying the string to the same length.
          * That is the case where there is only one font used and we can
          * specify the overall advance of the string. (See below).
          */
 
         Point2D gvAdvancePt = g.getGlyphPosition(numGlyphs);
         float gvAdvanceX = (float)gvAdvancePt.getX();
         boolean layoutAffectsAdvance = false;
         if (font.hasLayoutAttributes() && printingGlyphVector &&
             noPositionAdjustments) {
 
             /* If TRACKING is in use then the glyph vector will report
              * position adjustments, then that ought to be sufficient to
              * tell us we can't just ask native to do "drawString". But layout
              * always sets the position adjustment flag, so we don't believe
              * it and verify the positions are really different than
              * createGlyphVector() (with no layout) would create. However
              * inconsistently, TRACKING is applied when creating a GlyphVector,
              * since it doesn't actually require "layout" (even though its
              * considered a layout attribute), it just requires a fractional
              * tweak to the[default]advances. So we need to specifically
              * check for tracking until such time as as we can trust
              * the GlyphVector.FLAG_HAS_POSITION_ADJUSTMENTS bit.
              */
             Map<TextAttribute, ?> map = font.getAttributes();
             Object o = map.get(TextAttribute.TRACKING);
             boolean tracking = o != null && (o instanceof Number) &&
                 (((Number)o).floatValue() != 0f);
 
             if (tracking) {
                 noPositionAdjustments = false;
             } else {
                 Rectangle2D bounds = font.getStringBounds(str, gvFrc);
                 float strAdvanceX = (float)bounds.getWidth();
                 if (Math.abs(strAdvanceX - gvAdvanceX) > 0.00001) {
                     layoutAffectsAdvance = true;
                 }
             }
         }
 
         if (compatibleFRC && noPositionAdjustments && !layoutAffectsAdvance) {
             drawString(str, x, y, font, gvFrc, 0f);
             return true;
         }
 
         /* If positions have not been explicitly assigned, we can
          * ask the string to be drawn adjusted to this width.
          * This call is supported only in the PS generator.
          * GDI has API to specify the advance for each glyph in a
          * string which could be used here too, but that is not yet
          * implemented, and we'd need to update the signature of the
          * drawString method to take the advances (ie relative positions)
          * and use that instead of the width.
          */
         if (numFonts == 1 && canDrawStringToWidth() && noPositionAdjustments) {
             drawString(str, x, y, font, gvFrc, gvAdvanceX);
             return true;
         }
 
         /* In some scripts chars drawn individually do not have the
          * same representation (glyphs) as when combined with other chars.
          * The logic here is erring on the side of caution, in particular
          * in including supplementary characters.
          */
         if (FontUtilities.isComplexText(chars, 0, chars.length)) {
             return printGlyphVector(g, x, y);
         }
 
         /* If we reach here we have mapped all the glyphs back
          * one-to-one to simple unicode chars that we know are in the font.
          * We can call "drawChars" on each one of them in turn, setting
          * the position based on the glyph positions.
          * There's typically overhead in this. If numGlyphs is 'large',
          * it may even be better to try printGlyphVector() in this case.
          * This may be less recoverable for apps, but sophisticated apps
          * should be able to recover the text from simple glyph vectors
          * and we can avoid penalising the more common case - although
          * this is already a minority case.
          */
         if (numGlyphs > 10 && printGlyphVector(g, x, y)) {
             return true;
         }
 
         for (int i=0; i<numGlyphs; i++) {
             String s = new String(chars, i, 1);
             drawString(s, x+positions[i*2], y+positions[i*2+1],
                        font, gvFrc, 0f);
         }
         return true;
     }
 
     /* The same codes must be in the same positions for this to return true.
      * This would look cleaner if it took the original GV as a parameter but
      * we already have the codes and will need to get the positions array
      * too in most cases anyway. So its cheaper to pass them in.
      * This call wouldn't be necessary if layout didn't always set the
      * FLAG_HAS_POSITION_ADJUSTMENTS even if the default advances are used
      * and there was no re-ordering (this should be fixed some day).
      */
     private boolean samePositions(GlyphVector gv, int[] gvcodes,
                                   int[] origCodes, float[] origPositions) {
 
         int numGlyphs = gv.getNumGlyphs();
         float[] gvpos = gv.getGlyphPositions(0, numGlyphs, null);
 
         /* this shouldn't happen here, but just in case */
         if (numGlyphs != gvcodes.length ||  /* real paranoia here */
             origCodes.length != gvcodes.length ||
             origPositions.length != gvpos.length) {
             return false;
         }
 
         for (int i=0; i<numGlyphs; i++) {
             if (gvcodes[i] != origCodes[i] || gvpos[i] != origPositions[i]) {
                 return false;
             }
         }
         return true;
     }
 
     protected boolean canDrawStringToWidth() {
         return false;
     }
 
     /* return an array which can map glyphs back to char codes.
      * Glyphs which aren't mapped from a simple unicode code point
      * will have no mapping in this array, and will be assumed to be
      * because of some substitution that we can't handle.
      */
     private static char[] getGlyphToCharMapForFont(Font2D font2D) {
         /* NB Composites report the number of glyphs in slot 0.
          * So if a string uses a char from a later slot, or a fallback slot,
          * it will not be able to use this faster path.
          */
         int numGlyphs = font2D.getNumGlyphs();
         int missingGlyph = font2D.getMissingGlyphCode();
         char[] glyphToCharMap = new char[numGlyphs];
         int glyph;
 
         for (int i=0;i<numGlyphs; i++) {
             glyphToCharMap[i] = CharToGlyphMapper.INVISIBLE_GLYPH_ID;
         }
 
         /* Consider refining the ranges to try to map by asking the font
          * what ranges it supports.
          * Since a glyph may be mapped by multiple code points, and this
          * code can't handle that, we always prefer the earlier code point.
          */
         for (char c=0; c<0xFFFF; c++) {
            if (c >= CharToGlyphMapper.HI_SURROGATE_START &&
                c <= CharToGlyphMapper.LO_SURROGATE_END) {
                 continue;
             }
             glyph = font2D.charToGlyph(c);
             if (glyph != missingGlyph && glyph < numGlyphs &&
                 (glyphToCharMap[glyph] ==
                  CharToGlyphMapper.INVISIBLE_GLYPH_ID)) {
                 glyphToCharMap[glyph] = c;
             }
         }
         return glyphToCharMap;
     }
 
     /**
      * Strokes the outline of a Shape using the settings of the current
      * graphics state.  The rendering attributes applied include the
      * clip, transform, paint or color, composite and stroke attributes.
      * @param s The shape to be drawn.
      * @see #setStroke
      * @see #setPaint
      * @see java.awt.Graphics#setColor
      * @see #transform
      * @see #setTransform
      * @see #clip
      * @see #setClip
      * @see #setComposite
      */
     public void draw(Shape s) {
 
         fill(getStroke().createStrokedShape(s));
     }
 
     /**
      * Fills the interior of a Shape using the settings of the current
      * graphics state. The rendering attributes applied include the
      * clip, transform, paint or color, and composite.
      * @see #setPaint
      * @see java.awt.Graphics#setColor
      * @see #transform
      * @see #setTransform
      * @see #setComposite
      * @see #clip
      * @see #setClip
      */
     public void fill(Shape s) {
         Paint paint = getPaint();
 
         try {
             fill(s, (Color) paint);
 
         /* The PathGraphics class only supports filling with
          * solid colors and so we do not expect the cast of Paint
          * to Color to fail. If it does fail then something went
          * wrong, like the app draw a page with a solid color but
          * then redrew it with a Gradient.
          */
         } catch (ClassCastException e) {
             throw new IllegalArgumentException("Expected a Color instance");
         }
     }
 
     public void fill(Shape s, Color color) {
         AffineTransform deviceTransform = getTransform();
 
         if (getClip() != null) {
             deviceClip(getClip().getPathIterator(deviceTransform));
         }
         deviceFill(s.getPathIterator(deviceTransform), color);
     }
 
     /**
      * Fill the path defined by <code>pathIter</code>
      * with the specified color.
      * The path is provided in device coordinates.
      */
     protected abstract void deviceFill(PathIterator pathIter, Color color);
 
     /*
      * Set the clipping path to that defined by
      * the passed in <code>PathIterator</code>.
      */
     protected abstract void deviceClip(PathIterator pathIter);
 
     /*
      * Draw the outline of the rectangle without using path
      * if supported by platform.
      */
     protected abstract void deviceFrameRect(int x, int y,
                                             int width, int height,
                                             Color color);
 
     /*
      * Draw a line without using path if supported by platform.
      */
     protected abstract void deviceDrawLine(int xBegin, int yBegin,
                                            int xEnd, int yEnd, Color color);
 
     /*
      * Fill a rectangle using specified color.
      */
     protected abstract void deviceFillRect(int x, int y,
                                            int width, int height, Color color);
 
     /* Obtain a BI from known implementations of java.awt.Image
      */
     protected BufferedImage getBufferedImage(Image img) {
         if (img instanceof BufferedImage) {
             // Otherwise we expect a BufferedImage to behave as a standard BI
             return (BufferedImage)img;
         } else if (img instanceof ToolkitImage) {
             // This can be null if the image isn't loaded yet.
             // This is fine as in that case our caller will return
             // as it will only draw a fully loaded image
             return ((ToolkitImage)img).getBufferedImage();
         } else if (img instanceof VolatileImage) {
             // VI needs to make a new BI: this is unavoidable but
             // I don't expect VI's to be "huge" in any case.
             return ((VolatileImage)img).getSnapshot();
         } else {
             // may be null or may be some non-standard Image which
             // shouldn't happen as Image is implemented by the platform
             // not by applications
             // If you add a new Image implementation to the platform you
             // will need to support it here similarly to VI.
             return null;
         }
     }
 
     /**
      * Return true if the BufferedImage argument has non-opaque
      * bits in it and therefore can not be directly rendered by
      * GDI. Return false if the image is opaque. If this function
      * can not tell for sure whether the image has transparent
      * pixels then it assumes that it does.
      */
     protected boolean hasTransparentPixels(BufferedImage bufferedImage) {
         ColorModel colorModel = bufferedImage.getColorModel();
         boolean hasTransparency = colorModel == null
             ? true
             : colorModel.getTransparency() != ColorModel.OPAQUE;
 
         /*
          * For the default INT ARGB check the image to see if any pixels are
          * really transparent. If there are no transparent pixels then the
          * transparency of the color model can be ignored.
          * We assume that IndexColorModel images have already been
          * checked for transparency and will be OPAQUE unless they actually
          * have transparent pixels present.
          */
         if (hasTransparency && bufferedImage != null) {
             if (bufferedImage.getType()==BufferedImage.TYPE_INT_ARGB ||
                 bufferedImage.getType()==BufferedImage.TYPE_INT_ARGB_PRE) {
                 DataBuffer db =  bufferedImage.getRaster().getDataBuffer();
                 SampleModel sm = bufferedImage.getRaster().getSampleModel();
                 if (db instanceof DataBufferInt &&
                     sm instanceof SinglePixelPackedSampleModel) {
                     SinglePixelPackedSampleModel psm =
                         (SinglePixelPackedSampleModel)sm;
                     // Stealing the data array for reading only...
                     int[] int_data =
                         SunWritableRaster.stealData((DataBufferInt) db, 0);
                     int x = bufferedImage.getMinX();
                     int y = bufferedImage.getMinY();
                     int w = bufferedImage.getWidth();
                     int h = bufferedImage.getHeight();
                     int stride = psm.getScanlineStride();
                     boolean hastranspixel = false;
                     for (int j = y; j < y+h; j++) {
                         int yoff = j * stride;
                         for (int i = x; i < x+w; i++) {
                             if ((int_data[yoff+i] & 0xff000000)!=0xff000000 ) {
                                 hastranspixel = true;
                                 break;
                             }
                         }
                         if (hastranspixel) {
                             break;
                         }
                     }
                     if (hastranspixel == false) {
                         hasTransparency = false;
                     }
                 }
             }
         }
 
         return hasTransparency;
     }
 
     protected boolean isBitmaskTransparency(BufferedImage bufferedImage) {
         ColorModel colorModel = bufferedImage.getColorModel();
         return (colorModel != null &&
                 colorModel.getTransparency() == ColorModel.BITMASK);
     }
 
 
     /* An optimisation for the special case of ICM images which have
      * bitmask transparency.
      */
     protected boolean drawBitmaskImage(BufferedImage bufferedImage,
                                        AffineTransform xform,
                                        Color bgcolor,
                                        int srcX, int srcY,
                                        int srcWidth, int srcHeight) {
 
         ColorModel colorModel = bufferedImage.getColorModel();
         IndexColorModel icm;
         int [] pixels;
 
         if (!(colorModel instanceof IndexColorModel)) {
             return false;
         } else {
             icm = (IndexColorModel)colorModel;
         }
 
         if (colorModel.getTransparency() != ColorModel.BITMASK) {
             return false;
         }
 
         // to be compatible with 1.1 printing which treated b/g colors
         // with alpha 128 as opaque
         if (bgcolor != null && bgcolor.getAlpha() < 128) {
             return false;
         }
 
         if ((xform.getType()
              & ~( AffineTransform.TYPE_UNIFORM_SCALE
                   | AffineTransform.TYPE_TRANSLATION
                   | AffineTransform.TYPE_QUADRANT_ROTATION
                   )) != 0) {
             return false;
         }
 
         if ((getTransform().getType()
              & ~( AffineTransform.TYPE_UNIFORM_SCALE
                   | AffineTransform.TYPE_TRANSLATION
                   | AffineTransform.TYPE_QUADRANT_ROTATION
                   )) != 0) {
             return false;
         }
 
         BufferedImage subImage = null;
         Raster raster = bufferedImage.getRaster();
         int transpixel = icm.getTransparentPixel();
         byte[] alphas = new byte[icm.getMapSize()];
         icm.getAlphas(alphas);
         if (transpixel >= 0) {
             alphas[transpixel] = 0;
         }
 
         /* don't just use srcWidth & srcHeight from application - they
          * may exceed the extent of the image - may need to clip.
          * The image xform will ensure that points are still mapped properly.
          */
         int rw = raster.getWidth();
         int rh = raster.getHeight();
         if (srcX > rw || srcY > rh) {
             return false;
         }
         int right, bottom, wid, hgt;
         if (srcX+srcWidth > rw) {
             right = rw;
             wid = right - srcX;
         } else {
             right = srcX+srcWidth;
             wid = srcWidth;
         }
         if (srcY+srcHeight > rh) {
             bottom = rh;
             hgt = bottom - srcY;
         } else {
             bottom = srcY+srcHeight;
             hgt = srcHeight;
         }
         pixels = new int[wid];
         for (int j=srcY; j<bottom; j++) {
             int startx = -1;
             raster.getPixels(srcX, j, wid, 1, pixels);
             for (int i=srcX; i<right; i++) {
                 if (alphas[pixels[i-srcX]] == 0) {
                     if (startx >=0) {
                         subImage = bufferedImage.getSubimage(startx, j,
                                                              i-startx, 1);
                         xform.translate(startx, j);
                         drawImageToPlatform(subImage, xform, bgcolor,
                                       0, 0, i-startx, 1, true);
                         xform.translate(-startx, -j);
                         startx = -1;
                     }
                 } else if (startx < 0) {
                     startx = i;
                 }
             }
             if (startx >= 0) {
                 subImage = bufferedImage.getSubimage(startx, j,
                                                      right - startx, 1);
                 xform.translate(startx, j);
                 drawImageToPlatform(subImage, xform, bgcolor,
                               0, 0, right - startx, 1, true);
                 xform.translate(-startx, -j);
             }
         }
         return true;
     }
 
 
 
     /**
      * The various <code>drawImage()</code> methods for
      * <code>PathGraphics</code> are all decomposed
      * into an invocation of <code>drawImageToPlatform</code>.
      * The portion of the passed in image defined by
      * <code>srcX, srcY, srcWidth, and srcHeight</code>
      * is transformed by the supplied AffineTransform and
      * drawn using PS to the printer context.
      *
      * @param   img     The image to be drawn.
      *                  This method does nothing if <code>img</code> is null.
      * @param   xform   Used to tranform the image before drawing.
      *                  This can be null.
      * @param   bgcolor This color is drawn where the image has transparent
      *                  pixels. If this parameter is null then the
      *                  pixels already in the destination should show
      *                  through.
      * @param   srcX    With srcY this defines the upper-left corner
      *                  of the portion of the image to be drawn.
      *
      * @param   srcY    With srcX this defines the upper-left corner
      *                  of the portion of the image to be drawn.
      * @param   srcWidth    The width of the portion of the image to
      *                      be drawn.
      * @param   srcHeight   The height of the portion of the image to
      *                      be drawn.
      * @param   handlingTransparency if being recursively called to
      *                    print opaque region of transparent image
      */
     protected abstract boolean
         drawImageToPlatform(Image img, AffineTransform xform,
                             Color bgcolor,
                             int srcX, int srcY,
                             int srcWidth, int srcHeight,
                             boolean handlingTransparency);
 
     /**
      * Draws as much of the specified image as is currently available.
      * The image is drawn with its top-left corner at
      * (<i>x</i>,&nbsp;<i>y</i>) in this graphics context's coordinate
      * space. Transparent pixels in the image do not affect whatever
      * pixels are already there.
      * <p>
      * This method returns immediately in all cases, even if the
      * complete image has not yet been loaded, and it has not been dithered
      * and converted for the current output device.
      * <p>
      * If the image has not yet been completely loaded, then
      * <code>drawImage</code> returns <code>false</code>. As more of
      * the image becomes available, the process that draws the image notifies
      * the specified image observer.
      * @param    img the specified image to be drawn.
      * @param    x   the <i>x</i> coordinate.
      * @param    y   the <i>y</i> coordinate.
      * @param    observer    object to be notified as more of
      *                          the image is converted.
      * @see      java.awt.Image
      * @see      java.awt.image.ImageObserver
      * @see      java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
      * @since    JDK1.0
      */
     public boolean drawImage(Image img, int x, int y,
                              ImageObserver observer) {
 
         return drawImage(img, x, y, null, observer);
     }
 
     /**
      * Draws as much of the specified image as has already been scaled
      * to fit inside the specified rectangle.
      * <p>
      * The image is drawn inside the specified rectangle of this
      * graphics context's coordinate space, and is scaled if
      * necessary. Transparent pixels do not affect whatever pixels
      * are already there.
      * <p>
      * This method returns immediately in all cases, even if the
      * entire image has not yet been scaled, dithered, and converted
      * for the current output device.
      * If the current output representation is not yet complete, then
      * <code>drawImage</code> returns <code>false</code>. As more of
      * the image becomes available, the process that draws the image notifies
      * the image observer by calling its <code>imageUpdate</code> method.
      * <p>
      * A scaled version of an image will not necessarily be
      * available immediately just because an unscaled version of the
      * image has been constructed for this output device.  Each size of
      * the image may be cached separately and generated from the original
      * data in a separate image production sequence.
      * @param    img    the specified image to be drawn.
      * @param    x      the <i>x</i> coordinate.
      * @param    y      the <i>y</i> coordinate.
      * @param    width  the width of the rectangle.
      * @param    height the height of the rectangle.
      * @param    observer    object to be notified as more of
      *                          the image is converted.
      * @see      java.awt.Image
      * @see      java.awt.image.ImageObserver
      * @see      java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
      * @since    JDK1.0
      */
     public boolean drawImage(Image img, int x, int y,
                              int width, int height,
                              ImageObserver observer) {
 
         return drawImage(img, x, y, width, height, null, observer);
 
     }
 
     /*
      * Draws as much of the specified image as is currently available.
      * The image is drawn with its top-left corner at
      * (<i>x</i>,&nbsp;<i>y</i>) in this graphics context's coordinate
      * space.  Transparent pixels are drawn in the specified
      * background color.
      * <p>
      * This operation is equivalent to filling a rectangle of the
      * width and height of the specified image with the given color and then
      * drawing the image on top of it, but possibly more efficient.
      * <p>
      * This method returns immediately in all cases, even if the
      * complete image has not yet been loaded, and it has not been dithered
      * and converted for the current output device.
      * <p>
      * If the image has not yet been completely loaded, then
      * <code>drawImage</code> returns <code>false</code>. As more of
      * the image becomes available, the process that draws the image notifies
      * the specified image observer.
      * @param    img    the specified image to be drawn.
      *                  This method does nothing if <code>img</code> is null.
      * @param    x      the <i>x</i> coordinate.
      * @param    y      the <i>y</i> coordinate.
      * @param    bgcolor the background color to paint under the
      *                   non-opaque portions of the image.
      *                   In this WPathGraphics implementation,
      *                   this parameter can be null in which
      *                   case that background is made a transparent
      *                   white.
      * @param    observer    object to be notified as more of
      *                          the image is converted.
      * @see      java.awt.Image
      * @see      java.awt.image.ImageObserver
      * @see      java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
      * @since    JDK1.0
      */
     public boolean drawImage(Image img, int x, int y,
                              Color bgcolor,
                              ImageObserver observer) {
 
         if (img == null) {
             return true;
         }
 
         boolean result;
         int srcWidth = img.getWidth(null);
         int srcHeight = img.getHeight(null);
 
         if (srcWidth < 0 || srcHeight < 0) {
             result = false;
         } else {
             result = drawImage(img, x, y, srcWidth, srcHeight, bgcolor, observer);
         }
 
         return result;
     }
 
     /**
      * Draws as much of the specified image as has already been scaled
      * to fit inside the specified rectangle.
      * <p>
      * The image is drawn inside the specified rectangle of this
      * graphics context's coordinate space, and is scaled if
      * necessary. Transparent pixels are drawn in the specified
      * background color.
      * This operation is equivalent to filling a rectangle of the
      * width and height of the specified image with the given color and then
      * drawing the image on top of it, but possibly more efficient.
      * <p>
      * This method returns immediately in all cases, even if the
      * entire image has not yet been scaled, dithered, and converted
      * for the current output device.
      * If the current output representation is not yet complete then
      * <code>drawImage</code> returns <code>false</code>. As more of
      * the image becomes available, the process that draws the image notifies
      * the specified image observer.
      * <p>
      * A scaled version of an image will not necessarily be
      * available immediately just because an unscaled version of the
      * image has been constructed for this output device.  Each size of
      * the image may be cached separately and generated from the original
      * data in a separate image production sequence.
      * @param    img       the specified image to be drawn.
      *                     This method does nothing if <code>img</code> is null.
      * @param    x         the <i>x</i> coordinate.
      * @param    y         the <i>y</i> coordinate.
      * @param    width     the width of the rectangle.
      * @param    height    the height of the rectangle.
      * @param    bgcolor   the background color to paint under the
      *                         non-opaque portions of the image.
      * @param    observer    object to be notified as more of
      *                          the image is converted.
      * @see      java.awt.Image
      * @see      java.awt.image.ImageObserver
      * @see      java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
      * @since    JDK1.0
      */
     public boolean drawImage(Image img, int x, int y,
                              int width, int height,
                              Color bgcolor,
                              ImageObserver observer) {
 
         if (img == null) {
             return true;
         }
 
         boolean result;
         int srcWidth = img.getWidth(null);
         int srcHeight = img.getHeight(null);
 
         if (srcWidth < 0 || srcHeight < 0) {
             result = false;
         } else {
             result = drawImage(img,
                          x, y, x + width, y + height,
                          0, 0, srcWidth, srcHeight,
                          observer);
         }
 
         return result;
     }
 
     /**
      * Draws as much of the specified area of the specified image as is
      * currently available, scaling it on the fly to fit inside the
      * specified area of the destination drawable surface. Transparent pixels
      * do not affect whatever pixels are already there.
      * <p>
      * This method returns immediately in all cases, even if the
      * image area to be drawn has not yet been scaled, dithered, and converted
      * for the current output device.
      * If the current output representation is not yet complete then
      * <code>drawImage</code> returns <code>false</code>. As more of
      * the image becomes available, the process that draws the image notifies
      * the specified image observer.
      * <p>
      * This method always uses the unscaled version of the image
      * to render the scaled rectangle and performs the required
      * scaling on the fly. It does not use a cached, scaled version
      * of the image for this operation. Scaling of the image from source
      * to destination is performed such that the first coordinate
      * of the source rectangle is mapped to the first coordinate of
      * the destination rectangle, and the second source coordinate is
      * mapped to the second destination coordinate. The subimage is
      * scaled and flipped as needed to preserve those mappings.
      * @param       img the specified image to be drawn
      * @param       dx1 the <i>x</i> coordinate of the first corner of the
      *                    destination rectangle.
      * @param       dy1 the <i>y</i> coordinate of the first corner of the
      *                    destination rectangle.
      * @param       dx2 the <i>x</i> coordinate of the second corner of the
      *                    destination rectangle.
      * @param       dy2 the <i>y</i> coordinate of the second corner of the
      *                    destination rectangle.
      * @param       sx1 the <i>x</i> coordinate of the first corner of the
      *                    source rectangle.
      * @param       sy1 the <i>y</i> coordinate of the first corner of the
      *                    source rectangle.
      * @param       sx2 the <i>x</i> coordinate of the second corner of the
      *                    source rectangle.
      * @param       sy2 the <i>y</i> coordinate of the second corner of the
      *                    source rectangle.
      * @param       observer object to be notified as more of the image is
      *                    scaled and converted.
      * @see         java.awt.Image
      * @see         java.awt.image.ImageObserver
      * @see         java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
      * @since       JDK1.1
      */
     public boolean drawImage(Image img,
                              int dx1, int dy1, int dx2, int dy2,
                              int sx1, int sy1, int sx2, int sy2,
                              ImageObserver observer) {
 
         return drawImage(img,
                          dx1, dy1, dx2, dy2,
                          sx1, sy1, sx2, sy2,
                          null, observer);
     }
 
     /**
      * Draws as much of the specified area of the specified image as is
      * currently available, scaling it on the fly to fit inside the
      * specified area of the destination drawable surface.
      * <p>
      * Transparent pixels are drawn in the specified background color.
      * This operation is equivalent to filling a rectangle of the
      * width and height of the specified image with the given color and then
      * drawing the image on top of it, but possibly more efficient.
      * <p>
      * This method returns immediately in all cases, even if the
      * image area to be drawn has not yet been scaled, dithered, and converted
      * for the current output device.
      * If the current output representation is not yet complete then
      * <code>drawImage</code> returns <code>false</code>. As more of
      * the image becomes available, the process that draws the image notifies
      * the specified image observer.
      * <p>
      * This method always uses the unscaled version of the image
      * to render the scaled rectangle and performs the required
      * scaling on the fly. It does not use a cached, scaled version
      * of the image for this operation. Scaling of the image from source
      * to destination is performed such that the first coordinate
      * of the source rectangle is mapped to the first coordinate of
      * the destination rectangle, and the second source coordinate is
      * mapped to the second destination coordinate. The subimage is
      * scaled and flipped as needed to preserve those mappings.
      * @param       img the specified image to be drawn
      *                  This method does nothing if <code>img</code> is null.
      * @param       dx1 the <i>x</i> coordinate of the first corner of the
      *                    destination rectangle.
      * @param       dy1 the <i>y</i> coordinate of the first corner of the
      *                    destination rectangle.
      * @param       dx2 the <i>x</i> coordinate of the second corner of the
      *                    destination rectangle.
      * @param       dy2 the <i>y</i> coordinate of the second corner of the
      *                    destination rectangle.
      * @param       sx1 the <i>x</i> coordinate of the first corner of the
      *                    source rectangle.
      * @param       sy1 the <i>y</i> coordinate of the first corner of the
      *                    source rectangle.
      * @param       sx2 the <i>x</i> coordinate of the second corner of the
      *                    source rectangle.
      * @param       sy2 the <i>y</i> coordinate of the second corner of the
      *                    source rectangle.
      * @param       bgcolor the background color to paint under the
      *                    non-opaque portions of the image.
      * @param       observer object to be notified as more of the image is
      *                    scaled and converted.
      * @see         java.awt.Image
      * @see         java.awt.image.ImageObserver
      * @see         java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
      * @since       JDK1.1
      */
     public boolean drawImage(Image img,
                              int dx1, int dy1, int dx2, int dy2,
                              int sx1, int sy1, int sx2, int sy2,
                              Color bgcolor,
                              ImageObserver observer) {
 
         if (img == null) {
             return true;
         }
         int imgWidth = img.getWidth(null);
         int imgHeight = img.getHeight(null);
 
         if (imgWidth < 0 || imgHeight < 0) {
             return true;
         }
 
         int srcWidth = sx2 - sx1;
         int srcHeight = sy2 - sy1;
 
         /* Create a transform which describes the changes
          * from the source coordinates to the destination
          * coordinates. The scaling is determined by the
          * ratio of the two rectangles, while the translation
          * comes from the difference of their origins.
          */
         float scalex = (float) (dx2 - dx1) / srcWidth;
         float scaley = (float) (dy2 - dy1) / srcHeight;
         AffineTransform xForm
             = new AffineTransform(scalex,
                                   0,
                                   0,
                                   scaley,
                                   dx1 - (sx1 * scalex),
                                   dy1 - (sy1 * scaley));
 
         /* drawImageToPlatform needs the top-left of the source area and
          * a positive width and height. The xform describes how to map
          * src->dest, so that information is not lost.
          */
         int tmp=0;
         if (sx2 < sx1) {
             tmp = sx1;
             sx1 = sx2;
             sx2 = tmp;
         }
         if (sy2 < sy1) {
             tmp = sy1;
             sy1 = sy2;
             sy2 = tmp;
         }
 
         /* if src area is beyond the bounds of the image, we must clip it.
          * The transform is based on the specified area, not the clipped one.
          */
         if (sx1 < 0) {
             sx1 = 0;
         } else if (sx1 > imgWidth) { // empty srcArea, nothing to draw
             sx1 = imgWidth;
         }
         if (sx2 < 0) { // empty srcArea, nothing to draw
             sx2 = 0;
         } else if (sx2 > imgWidth) {
             sx2 = imgWidth;
         }
         if (sy1 < 0) {
             sy1 = 0;
         } else if (sy1 > imgHeight) { // empty srcArea
             sy1 = imgHeight;
         }
         if (sy2 < 0) {  // empty srcArea
             sy2 = 0;
         } else if (sy2 > imgHeight) {
             sy2 = imgHeight;
         }
 
         srcWidth =  sx2 - sx1;
         srcHeight = sy2 - sy1;
 
         if (srcWidth <= 0 || srcHeight <= 0) {
             return true;
         }
 
         return drawImageToPlatform(img, xForm, bgcolor,
                                    sx1, sy1, srcWidth, srcHeight, false);
 
 
     }
 
     /**
      * Draws an image, applying a transform from image space into user space
      * before drawing.
      * The transformation from user space into device space is done with
      * the current transform in the Graphics2D.
      * The given transformation is applied to the image before the
      * transform attribute in the Graphics2D state is applied.
      * The rendering attributes applied include the clip, transform,
      * and composite attributes. Note that the result is
      * undefined, if the given transform is noninvertible.
      * @param img The image to be drawn.
      *            This method does nothing if <code>img</code> is null.
      * @param xform The transformation from image space into user space.
      * @param obs The image observer to be notified as more of the image
      * is converted.
      * @see #transform
      * @see #setTransform
      * @see #setComposite
      * @see #clip
      * @see #setClip
      */
     public boolean drawImage(Image img,
                              AffineTransform xform,
                              ImageObserver obs) {
 
         if (img == null) {
             return true;
         }
 
         boolean result;
         int srcWidth = img.getWidth(null);
         int srcHeight = img.getHeight(null);
 
         if (srcWidth < 0 || srcHeight < 0) {
             result = false;
         } else {
             result = drawImageToPlatform(img, xform, null,
                                          0, 0, srcWidth, srcHeight, false);
         }
 
         return result;
     }
 
     /**
      * Draws a BufferedImage that is filtered with a BufferedImageOp.
      * The rendering attributes applied include the clip, transform
      * and composite attributes.  This is equivalent to:
      * <pre>
      * img1 = op.filter(img, null);
      * drawImage(img1, new AffineTransform(1f,0f,0f,1f,x,y), null);
      * </pre>
      * @param op The filter to be applied to the image before drawing.
      * @param img The BufferedImage to be drawn.
      *            This method does nothing if <code>img</code> is null.
      * @param x,y The location in user space where the image should be drawn.
      * @see #transform
      * @see #setTransform
      * @see #setComposite
      * @see #clip
      * @see #setClip
      */
     public void drawImage(BufferedImage img,
                           BufferedImageOp op,
                           int x,
                           int y) {
 
         if (img == null) {
             return;
         }
 
         int srcWidth = img.getWidth(null);
         int srcHeight = img.getHeight(null);
 
         if (op != null) {
             img = op.filter(img, null);
         }
         if (srcWidth <= 0 || srcHeight <= 0) {
             return;
         } else {
             AffineTransform xform = new AffineTransform(1f,0f,0f,1f,x,y);
             drawImageToPlatform(img, xform, null,
                                 0, 0, srcWidth, srcHeight, false);
         }
 
     }
 
     /**
      * Draws an image, applying a transform from image space into user space
      * before drawing.
      * The transformation from user space into device space is done with
      * the current transform in the Graphics2D.
      * The given transformation is applied to the image before the
      * transform attribute in the Graphics2D state is applied.
      * The rendering attributes applied include the clip, transform,
      * and composite attributes. Note that the result is
      * undefined, if the given transform is noninvertible.
      * @param img The image to be drawn.
      *            This method does nothing if <code>img</code> is null.
      * @param xform The transformation from image space into user space.
      * @see #transform
      * @see #setTransform
      * @see #setComposite
      * @see #clip
      * @see #setClip
      */
     public void drawRenderedImage(RenderedImage img,
                                   AffineTransform xform) {
 
         if (img == null) {
             return;
         }
 
         BufferedImage bufferedImage = null;
         int srcWidth = img.getWidth();
         int srcHeight = img.getHeight();
 
         if (srcWidth <= 0 || srcHeight <= 0) {
             return;
         }
 
         if (img instanceof BufferedImage) {
             bufferedImage = (BufferedImage) img;
         } else {
             bufferedImage = new BufferedImage(srcWidth, srcHeight,
                                               BufferedImage.TYPE_INT_ARGB);
             Graphics2D imageGraphics = bufferedImage.createGraphics();
             imageGraphics.drawRenderedImage(img, xform);
         }
 
         drawImageToPlatform(bufferedImage, xform, null,
                             0, 0, srcWidth, srcHeight, false);
 
     }
 
 }