114 lines
2.6 KiB
Java
114 lines
2.6 KiB
Java
/* Copyright (C) 2000 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package gnu.gcj.xlib;
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import gnu.gcj.RawData;
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import java.awt.Rectangle;
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/**
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* An X11 graphics context. Unlike a traditional X11 graphics
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* context, the target drawable is part of the GC state.
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*
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* Implementation notes: There is no need to do coalescing of changes
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* since Xlib will do this for us. The implementation relies on the
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* Xlib GC cache and will not try to be clever.
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*
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* @author Rolf W. Rasmussen <rolfwr@ii.uib.no>
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*/
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public class GC implements Cloneable
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{
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public GC(Drawable target)
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{
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this.target = target;
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initStructure(null);
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}
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public Object clone()
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{
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GC gcClone = (GC) super.clone();
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gcClone.structure = null;
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gcClone.initStructure(this);
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gcClone.updateClip();
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return gcClone;
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}
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private native void initStructure(GC copyFrom);
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public GC create()
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{
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return (GC) clone();
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}
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public void finalize()
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{
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disposeImpl();
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}
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public void dispose()
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{
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disposeImpl();
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}
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public synchronized native void disposeImpl();
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public native void setForeground(long pixel);
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public native void setFont(gnu.gcj.xlib.Font font);
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/**
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* Set the clip region for the graphics operations performed by the
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* GC.
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*
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* This is one of the few costly operations of this class. It is
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* suggested that the clip is only set or changed if really
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* necessary. Higher level APIs can make such optimizations
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* transparent.
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*
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* @param rectangles the union of these rectangles describe the clip
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* region.
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*/
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public void setClipRectangles(Rectangle[] rectangles)
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{
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clip = new Clip(rectangles);
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updateClip();
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}
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public native void drawString(String text, int x, int y);
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public native void drawLine(int x1, int y1, int x2, int y2);
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public native void drawRectangle(int x, int y, int w, int h);
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public native void fillRectangle(int x, int y, int w, int h);
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/**
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*
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* Clear area using the background pixel or pixmap of the drawable.
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* Note that this operation does not adhere to the current clip.
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*/
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public native void clearArea(int x, int y, int w, int h,
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boolean exposures);
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public native void putImage(XImage image,
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int srcX, int srcY,
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int destX, int destY,
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int width, int height);
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public Drawable getDrawable()
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{
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return target;
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}
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private native void updateClip();
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private Drawable target;
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private RawData structure;
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private Clip clip;
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}
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