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+/* XGraphics.java -- The Graphics implementation for X
+ Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.awt.peer.x;
+
+import gnu.x11.Colormap;
+import gnu.x11.Data;
+import gnu.x11.Display;
+import gnu.x11.Drawable;
+import gnu.x11.GC;
+import gnu.x11.Pixmap;
+import gnu.x11.Point;
+import gnu.x11.image.ZPixmap;
+
+import java.awt.AWTError;
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.Image;
+import java.awt.Rectangle;
+import java.awt.Shape;
+import java.awt.Toolkit;
+import java.awt.Transparency;
+import java.awt.image.BufferedImage;
+import java.awt.image.ImageObserver;
+import java.awt.image.ImageProducer;
+import java.text.AttributedCharacterIterator;
+import java.util.HashMap;
+
+public class XGraphics
+ extends Graphics
+ implements Cloneable
+{
+
+ /**
+ * The X Drawable to draw on.
+ */
+ private Drawable xdrawable;
+
+ /**
+ * The X graphics context (GC).
+ */
+ private GC xgc;
+
+ /**
+ * The current translation.
+ */
+ private int translateX;
+ private int translateY;
+
+ /**
+ * The current clip. Possibly null.
+ */
+ private Rectangle clip;
+
+ /**
+ * The current font, possibly null.
+ */
+ private Font font;
+
+ /**
+ * The current foreground color, possibly null.
+ */
+ private Color foreground;
+
+ /**
+ * Indicates if this object has been disposed.
+ */
+ private boolean disposed = false;
+
+ // TODO: Workaround for limitation in current Escher.
+ private Pixmap.Format pixmapFormat;
+ private int imageByteOrder;
+ private int pixelByteCount;
+
+ /**
+ * Creates a new XGraphics on the specified X Drawable.
+ *
+ * @param d the X Drawable for which we create the Graphics
+ */
+ XGraphics(Drawable d)
+ {
+ xdrawable = d;
+ xgc = new GC(d);
+ translateX = 0;
+ translateY = 0;
+ clip = new Rectangle(0, 0, d.width, d.height);
+
+ Display display = xdrawable.display;
+ pixmapFormat = display.default_pixmap_format;
+ imageByteOrder = display.image_byte_order;
+ pixelByteCount = pixmapFormat.bits_per_pixel () / 8;
+ }
+
+ /**
+ * Creates an exact copy of this graphics context.
+ *
+ * @return an exact copy of this graphics context
+ */
+ public Graphics create()
+ {
+ XGraphics copy = (XGraphics) clone();
+ return copy;
+ }
+
+ /**
+ * Translates the origin by (x, y).
+ */
+ public void translate(int x, int y)
+ {
+ translateX += x;
+ translateY += y;
+ if (clip != null)
+ {
+ clip.x -= x;
+ clip.y -= y;
+ }
+ }
+
+ /**
+ * Returns the current foreground color, possibly <code>null</code>.
+ *
+ * @return the current foreground color, possibly <code>null</code>
+ */
+ public Color getColor()
+ {
+ return foreground;
+ }
+
+ /**
+ * Sets the current foreground color. A <code>null</code> value doesn't
+ * change the current setting.
+ *
+ * @param c the foreground color to set
+ */
+ public void setColor(Color c)
+ {
+ if (c != null)
+ {
+ XToolkit tk = (XToolkit) Toolkit.getDefaultToolkit();
+ HashMap colorMap = tk.colorMap;
+ gnu.x11.Color col = (gnu.x11.Color) colorMap.get(c);
+ if (col == null)
+ {
+ Colormap map = xdrawable.display.default_colormap;
+ col = map.alloc_color (c.getRed() * 256,
+ c.getGreen() * 256,
+ c.getBlue() * 256);
+ colorMap.put(c, col);
+ }
+ xgc.set_foreground(col);
+ foreground = c;
+ }
+ }
+
+ public void setPaintMode()
+ {
+ // FIXME: Implement this.
+ throw new UnsupportedOperationException("Not yet implemented");
+ }
+
+ public void setXORMode(Color color)
+ {
+ // FIXME: Implement this.
+ throw new UnsupportedOperationException("Not yet implemented");
+ }
+
+ /**
+ * Returns the current font, possibly <code>null</code>.
+ *
+ * @return the current font, possibly <code>null</code>
+ */
+ public Font getFont()
+ {
+ return font;
+ }
+
+ /**
+ * Sets the font on the graphics context. A <code>null</code> value doesn't
+ * change the current setting.
+ *
+ * @param f the font to set
+ */
+ public void setFont(Font f)
+ {
+ if (f != null)
+ {
+ XFontPeer xFontPeer = (XFontPeer) f.getPeer();
+ xgc.set_font(xFontPeer.getXFont());
+ font = f;
+ }
+ }
+
+ /**
+ * Returns the font metrics for the specified font.
+ *
+ * @param font the font for which we want the font metrics
+ *
+ * @return the font metrics for the specified font
+ */
+ public FontMetrics getFontMetrics(Font font)
+ {
+ if (font == null)
+ {
+ if (this.font == null)
+ setFont(new Font("Dialog", Font.PLAIN, 12));
+ font = this.font;
+ }
+ XFontPeer xFontPeer = (XFontPeer) font.getPeer();
+ return xFontPeer.getFontMetrics(font);
+ }
+
+ /**
+ * Returns the bounds of the current clip.
+ *
+ * @return the bounds of the current clip
+ */
+ public Rectangle getClipBounds()
+ {
+ return clip != null ? clip.getBounds() : null;
+ }
+
+ /**
+ * Clips the current clip with the specified clip.
+ */
+ public void clipRect(int x, int y, int width, int height)
+ {
+ if (clip == null)
+ {
+ clip = new Rectangle(x, y, width, height);
+ }
+ else
+ {
+ computeIntersection(x, y, width, height, clip);
+ }
+ // Update the X clip setting.
+ setXClip(clip.x, clip.y, clip.width, clip.height);
+ }
+
+ /**
+ * Returns <code>true</code> when the specified rectangle intersects with
+ * the current clip, <code>false</code> otherwise. This is overridden to
+ * avoid unnecessary creation of Rectangles via getBounds().
+ *
+ * @param x the x coordinate of the rectangle
+ * @param y the y coordinate of the rectangle
+ * @param w the width of the rectangle
+ * @param h the height of the rectangle
+ *
+ * @return <code>true</code> when the specified rectangle intersects with
+ * the current clip, <code>false</code> otherwise
+ */
+ public boolean hitClip(int x, int y, int w, int h)
+ {
+ boolean hit;
+ if (clip == null)
+ {
+ hit = true;
+ }
+ else
+ {
+ // It's easier to determine if the rectangle lies outside the clip,
+ // so we determine that and reverse the result (if it's not completely
+ // outside, it most likely hits the clip rectangle).
+ int x2 = x + w;
+ int y2 = y + h;
+ int clipX2 = clip.x + clip.width;
+ int clipY2 = clip.y + clip.height;
+ boolean outside = (x < clip.x && x2 < clip.x) // Left.
+ || (x > clipX2 && x2 > clipX2) // Right.
+ || (y < clip.y && y2 < clip.y) // Top.
+ || (y > clipY2 && y2 > clipY2); // Bottom.
+ hit = ! outside;
+ }
+ return hit;
+ }
+
+ public void setClip(int x, int y, int width, int height)
+ {
+ if (clip != null)
+ clip.setBounds(x, y, width, height);
+ else
+ clip = new Rectangle(x, y, width, height);
+ setXClip(clip.x, clip.y, clip.width, clip.height);
+ }
+
+ /**
+ * Sets the clip on the X server GC. The coordinates are not yet translated,
+ * this will be performed by the X server.
+ *
+ * @param x the clip, X coordinate
+ * @param y the clip, Y coordinate
+ * @param w the clip, width
+ * @param h the clip, height
+ */
+ private void setXClip(int x, int y, int w, int h)
+ {
+ gnu.x11.Rectangle[] clipRects = new gnu.x11.Rectangle[] {
+ new gnu.x11.Rectangle(x, y, w, h) };
+ xgc.set_clip_rectangles(translateX, translateY, clipRects, GC.YX_BANDED);
+ }
+
+ public Shape getClip()
+ {
+ // Return a copy here, so nobody can trash our clip.
+ return clip == null ? null : clip.getBounds();
+ }
+
+ /**
+ * Sets the current clip.
+ *
+ * @param c the clip to set
+ */
+ public void setClip(Shape c)
+ {
+ if (c != null)
+ {
+ Rectangle b;
+ if (c instanceof Rectangle)
+ {
+ b = (Rectangle) c;
+ }
+ else
+ {
+ b = c.getBounds();
+ }
+ clip.setBounds(b);
+ setXClip(b.x, b.y, b.width, b.height);
+ }
+ else
+ {
+ clip.setBounds(0, 0, xdrawable.width, xdrawable.height);
+ setXClip(0, 0, xdrawable.width, xdrawable.height);
+ }
+ }
+
+ public void copyArea(int x, int y, int width, int height, int dx, int dy)
+ {
+ // Clip and translate src rectangle.
+ int srcX = Math.min(Math.max(x, clip.x), clip.x + clip.width)
+ + translateX;
+ int srcY = Math.min(Math.max(y, clip.y), clip.y + clip.height)
+ + translateY;
+ int srcWidth = Math.min(Math.max(x + width, clip.x),
+ clip.x + clip.width) - x;
+ int srcHeight = Math.min(Math.max(y + height, clip.y),
+ clip.y + clip.height) - y;
+ xdrawable.copy_area(xdrawable, xgc, srcX, srcY, srcWidth, srcHeight,
+ srcX + dx, srcY + dy);
+ }
+
+ /**
+ * Draws a line from point (x1, y1) to point (x2, y2).
+ */
+ public void drawLine(int x1, int y1, int x2, int y2)
+ {
+ //System.err.println("drawLine: " + (x1 + translateX) + ", " + ( y1 + translateY) + ", " + (x2 + translateX) + ", " + (y2 + translateY) + " on: " + xdrawable);
+ xdrawable.line(xgc, x1 + translateX, y1 + translateY,
+ x2 + translateX, y2 + translateY);
+ }
+
+ /**
+ * Fills the specified rectangle.
+ */
+ public void fillRect(int x, int y, int width, int height)
+ {
+ xdrawable.rectangle(xgc, x + translateX, y + translateY,
+ width, height, true);
+ }
+
+ public void clearRect(int x, int y, int width, int height)
+ {
+ xgc.set_foreground(Color.WHITE.getRGB());
+ xdrawable.rectangle(xgc, x, y, width, height, true);
+ if (foreground != null)
+ xgc.set_foreground(foreground.getRGB());
+ }
+
+ public void drawRoundRect(int x, int y, int width, int height, int arcWidth,
+ int arcHeight)
+ {
+ // Draw 4 lines.
+ int arcRadiusX = arcWidth / 2;
+ int arcRadiusY = arcHeight / 2;
+ drawLine(x + arcRadiusX, y, x + width - arcRadiusX, y);
+ drawLine(x, y + arcRadiusY, x, y + height - arcRadiusY);
+ drawLine(x + arcRadiusX, y + height, x + width - arcRadiusX, y + height);
+ drawLine(x + width, y + arcRadiusY, x + width, y + height - arcRadiusY);
+
+ // Draw the 4 arcs at the corners.
+ // Upper left.
+ drawArc(x, y, arcWidth, arcHeight, 90, 90);
+ // Lower left.
+ drawArc(x, y + height - arcHeight, arcWidth, arcHeight, 180, 90);
+ // Upper right.
+ drawArc(x + width - arcWidth, y, arcWidth, arcHeight, 0, 90);
+ // Lower right.
+ drawArc(x + width - arcWidth, y + height - arcHeight, arcWidth, arcHeight,
+ 270, 90);
+ }
+
+ public void fillRoundRect(int x, int y, int width, int height, int arcWidth,
+ int arcHeight)
+ {
+ // Fill the 3 rectangles that make up the inner area.
+ int arcRadiusX = arcWidth / 2;
+ int arcRadiusY = arcHeight / 2;
+ // Left.
+ fillRect(x, y + arcRadiusY, arcRadiusX, height - arcHeight);
+ // Middle.
+ fillRect(x + arcRadiusX, y, width - arcWidth, height);
+ // Right.
+ fillRect(x + width - arcRadiusX, y + arcRadiusY, arcRadiusX,
+ height - arcHeight);
+
+ // Fill the 4 arcs in the corners.
+ // Upper left.
+ fillArc(x, y, arcWidth, arcHeight, 90, 90);
+ // Lower left.
+ fillArc(x, y + height - arcHeight, arcWidth, arcHeight, 180, 90);
+ // Upper right.
+ fillArc(x + width - arcWidth, y, arcWidth, arcHeight, 0, 90);
+ // Lower right.
+ fillArc(x + width - arcWidth, y + height - arcHeight, arcWidth, arcHeight,
+ 270, 90);
+ }
+
+ public void drawOval(int x, int y, int width, int height)
+ {
+ xdrawable.arc(xgc, x, y, width, height, 0, 360 * 64, false);
+ }
+
+ public void fillOval(int x, int y, int width, int height)
+ {
+ xdrawable.arc(xgc, x, y, width, height, 0, 360 * 64, true);
+ }
+
+ public void drawArc(int x, int y, int width, int height, int arcStart,
+ int arcAngle)
+ {
+ xdrawable.arc(xgc, x, y, width, height, arcStart * 64, arcAngle * 64, false);
+ }
+
+ public void fillArc(int x, int y, int width, int height, int arcStart,
+ int arcAngle)
+ {
+ xdrawable.arc(xgc, x, y, width, height, arcStart * 64, arcAngle * 64, true);
+ }
+
+ public void drawPolyline(int[] xPoints, int[] yPoints, int npoints)
+ {
+ int numPoints = Math.min(xPoints.length, yPoints.length);
+ Point[] points = new Point[numPoints];
+ // FIXME: Improve Escher API to accept arrays to avoid creation
+ // of many Point objects.
+ for (int i = 0; i < numPoints; i++)
+ points[i] = new Point(xPoints[i], yPoints[i]);
+ xdrawable.poly_line(xgc, points, Drawable.ORIGIN);
+ }
+
+ public void drawPolygon(int[] xPoints, int[] yPoints, int npoints)
+ {
+ int numPoints = Math.min(xPoints.length, yPoints.length);
+ Point[] points = new Point[numPoints];
+ // FIXME: Improve Escher API to accept arrays to avoid creation
+ // of many Point objects.
+ for (int i = 0; i < numPoints; i++)
+ points[i] = new Point(xPoints[i], yPoints[i]);
+ xdrawable.poly_line(xgc, points, Drawable.ORIGIN);
+ }
+
+ public void fillPolygon(int[] xPoints, int[] yPoints, int npoints)
+ {
+ int numPoints = Math.min(xPoints.length, yPoints.length);
+ Point[] points = new Point[numPoints];
+ // FIXME: Improve Escher API to accept arrays to avoid creation
+ // of many Point objects.
+ for (int i = 0; i < numPoints; i++)
+ points[i] = new Point(xPoints[i], yPoints[i]);
+ xdrawable.fill_poly(xgc, points, Drawable.COMPLEX, Drawable.ORIGIN);
+ }
+
+ /**
+ * Draws the specified string at (x, y).
+ */
+ public void drawString(String string, int x, int y)
+ {
+ if (disposed)
+ throw new AWTError("XGraphics already disposed");
+
+ xdrawable.text(xgc, x + translateX, y + translateY, string);
+ }
+
+ public void drawString(AttributedCharacterIterator ci, int x, int y)
+ {
+ // FIXME: Implement this.
+ throw new UnsupportedOperationException("Not yet implemented");
+ }
+
+ /**
+ * Draws the specified image on the drawable at position (x,y).
+ */
+ public boolean drawImage(Image image, int x, int y, ImageObserver observer)
+ {
+ if (image instanceof XImage)
+ {
+ XImage xim = (XImage) image;
+ Pixmap pm = xim.pixmap;
+ xdrawable.copy_area(pm, xgc, 0, 0, pm.width, pm.height,
+ x + translateX, y + translateY);
+ }
+ else if (image instanceof BufferedImage
+ && ((BufferedImage) image).getTransparency() != Transparency.OPAQUE)
+ {
+ BufferedImage bi = (BufferedImage) image;
+ int width = bi.getWidth();
+ int height = bi.getHeight();
+ Data img = xdrawable.image(x + translateX, y + translateY,
+ width, height, 0xFFFFFFFF, 2);
+
+ // Compute line byte count.
+ int lineBitCount = width * pixmapFormat.bits_per_pixel ();
+ int rem = lineBitCount % pixmapFormat.scanline_pad ();
+ int linePadCount = lineBitCount / pixmapFormat.scanline_pad ()
+ + (rem == 0 ? 0 : 1);
+ int lineByteCount = linePadCount * pixmapFormat.scanline_pad () / 8;
+
+ // Composite source and destination pixel data.
+ int[] trgb = new int[3]; // The device rgb pixels.
+ for (int yy = 0; yy < height; yy++)
+ {
+ for (int xx = 0; xx < width; xx++)
+ {
+ getRGB(xx, yy, img, trgb, lineByteCount);
+ int srgb = bi.getRGB(xx, yy);
+ float alpha = ((srgb >> 24) & 0xff) / 256F;
+ float tAlpha = 1.F - alpha;
+ int red = (srgb >> 16) & 0xFF;
+ int green = (srgb >> 8) & 0xFF;
+ int blue = (srgb) & 0xFF;
+ trgb[0] = (int) (trgb[0] * tAlpha + red * alpha);
+ trgb[1] = (int) (trgb[1] * tAlpha + green * alpha);
+ trgb[2] = (int) (trgb[2] * tAlpha + blue * alpha);
+ setRGB(xx, yy, img, trgb, lineByteCount);
+ }
+ }
+
+ // Now we have the transparent image composited onto the target
+ // Image, now we only must copy it to the Drawable.
+ ZPixmap pm = new ZPixmap(xdrawable.display);
+ pm.width = width;
+ pm.height = height;
+ pm.init();
+ System.arraycopy(img.data, 32, pm.data, 0, img.data.length - 32);
+ xdrawable.put_image(xgc, pm, x + translateX, y + translateY);
+ }
+ else
+ {
+ // Pre-render the image into an XImage.
+ ImageProducer source = image.getSource();
+ ImageConverter conv = new ImageConverter();
+ source.startProduction(conv);
+ XImage xim = conv.getXImage();
+ Pixmap pm = xim.pixmap;
+ xdrawable.copy_area(pm, xgc, 0, 0, pm.width, pm.height,
+ x + translateX, y + translateY);
+ }
+ return true;
+ }
+
+ /**
+ * Helper method to work around limitation in the current Escher impl.
+ *
+ * @param x the x position
+ * @param y the y position
+ * @param img the image data
+ * @param rgb an 3-size array that holds the rgb values on method exit
+ */
+ private void getRGB(int x, int y, Data img, int[] rgb, int lineByteCount)
+ {
+ // TODO: Does this also work on non-RGB devices?
+ int i = y * lineByteCount + pixelByteCount * x;
+ if (imageByteOrder == gnu.x11.image.Image.LSB_FIRST)
+ {//if (i >= 5716-33) System.err.println("lbc: " + lineByteCount + ", " + pixelByteCount);
+ rgb[2] = img.data[32 + i];
+ rgb[1] = img.data[32 + i + 1];
+ rgb[0] = img.data[32 + i + 2];
+ }
+ else
+ { // MSB_FIRST
+ rgb[0] = img.data[32 + i];
+ rgb[1] = img.data[32 + i + 1];
+ rgb[2] = img.data[32 + i + 2];
+ }
+
+ }
+
+ /**
+ * Helper method to work around limitation in the current Escher impl.
+ *
+ * @param x the x position
+ * @param y the y position
+ * @param img the image data
+ * @param rgb an 3-size array that holds the rgb values on method exit
+ */
+ private void setRGB(int x, int y, Data img, int[] rgb, int lineByteCount)
+ {
+ // TODO: Does this also work on non-RGB devices?
+ int i = y * lineByteCount + pixelByteCount * x;
+ if (imageByteOrder == gnu.x11.image.Image.LSB_FIRST)
+ {
+ img.data[32 + i] = (byte) rgb[2];
+ img.data[32 + i + 1] = (byte) rgb[1];
+ img.data[32 + i + 2] = (byte) rgb[0];
+ }
+ else
+ { // MSB_FIRST
+ img.data[32 + i] = (byte) rgb[0];
+ img.data[32 + i + 1] = (byte) rgb[1];
+ img.data[32 + i + 2] = (byte) rgb[2];
+ }
+ }
+
+ public boolean drawImage(Image image, int x, int y, int width, int height,
+ ImageObserver observer)
+ {
+ // FIXME: Implement this.
+ throw new UnsupportedOperationException("Not yet implemented");
+ }
+
+ public boolean drawImage(Image image, int x, int y, Color bgcolor,
+ ImageObserver observer)
+ {
+ // FIXME: Implement this.
+ throw new UnsupportedOperationException("Not yet implemented");
+ }
+
+ public boolean drawImage(Image image, int x, int y, int width, int height,
+ Color bgcolor, ImageObserver observer)
+ {
+ // FIXME: Implement this.
+ throw new UnsupportedOperationException("Not yet implemented");
+ }
+
+ public boolean drawImage(Image image, int dx1, int dy1, int dx2, int dy2,
+ int sx1, int sy1, int sx2, int sy2,
+ ImageObserver observer)
+ {
+ return drawImage(image, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, null,
+ observer);
+ }
+
+ public boolean drawImage(Image image, int dx1, int dy1, int dx2, int dy2,
+ int sx1, int sy1, int sx2, int sy2, Color bgcolor,
+ ImageObserver observer)
+ {
+
+ // FIXME: What to do with bgcolor?
+
+ // Scale the image.
+ int sw = image.getWidth(observer);
+ int sh = image.getHeight(observer);
+ double scaleX = Math.abs(dx2 - dx1) / (double) Math.abs(sx2 - sx1);
+ double scaleY = Math.abs(dy2 - dy1) / (double) Math.abs(sy2 - sy1);
+ Image scaled = image.getScaledInstance((int) (scaleX * sw),
+ (int) (scaleY * sh),
+ Image.SCALE_FAST);
+
+ // Scaled source coordinates.
+ int sx1s = (int) (scaleX * Math.min(sx1, sx2));
+ int sx2s = (int) (scaleX * Math.max(sx1, sx2));
+
+ // Temporarily clip to the target rectangle.
+ Rectangle old = clip;
+ clipRect(dx1, dy1, dx2 - dx1, dy2 - dy1);
+
+ // Draw scaled image.
+ boolean res = drawImage(scaled, dx1 - sx1s, dy1 - sx2s, observer);
+
+ // Reset clip.
+ setClip(old);
+
+ return res;
+ }
+
+ /**
+ * Frees any resources associated with this object.
+ */
+ public void dispose()
+ {
+ if (! disposed)
+ {
+ xgc.free();
+ xdrawable.display.flush();
+ disposed = true;
+ }
+ }
+
+ // Additional helper methods.
+
+ /**
+ * Creates and returns an exact copy of this XGraphics.
+ */
+ protected Object clone()
+ {
+ try
+ {
+ XGraphics copy = (XGraphics) super.clone();
+ copy.xgc = xgc.copy();
+ if (clip != null)
+ {
+ copy.clip = new Rectangle(clip);
+ copy.setXClip(clip.x, clip.y, clip.width, clip.height);
+ }
+ return copy;
+ }
+ catch (CloneNotSupportedException ex)
+ {
+ assert false;
+ }
+ return null;
+ }
+
+ /**
+ * Computes the intersection between two rectangles and stores the result
+ * int the second rectangle.
+ *
+ * This method has been copied from {@link javax.swing.SwingUtilities}.
+ *
+ * @param x the x coordinate of the rectangle #1
+ * @param y the y coordinate of the rectangle #1
+ * @param w the width of the rectangle #1
+ * @param h the height of the rectangle #1
+ * @param rect the rectangle #2 and output rectangle
+ */
+ private static void computeIntersection(int x, int y, int w, int h,
+ Rectangle rect)
+ {
+ int x2 = (int) rect.x;
+ int y2 = (int) rect.y;
+ int w2 = (int) rect.width;
+ int h2 = (int) rect.height;
+
+ int dx = (x > x2) ? x : x2;
+ int dy = (y > y2) ? y : y2;
+ int dw = (x + w < x2 + w2) ? (x + w - dx) : (x2 + w2 - dx);
+ int dh = (y + h < y2 + h2) ? (y + h - dy) : (y2 + h2 - dy);
+
+ if (dw >= 0 && dh >= 0)
+ rect.setBounds(dx, dy, dw, dh);
+ else
+ rect.setBounds(0, 0, 0, 0);
+ }
+
+
+}
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