/*
* @(#)DrawingSurfaceInfo.java 1.10 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program 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.
*
* This program 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 at /legal/license.txt).
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package sun.awt;
import java.awt.Rectangle;
import java.awt.Shape;
/**
* The DrawingSurfaceInfo object provides a common interface to
* access all information about how to gain access to the drawing
* surface controlled by some Java object. The information can
* be divided into two different categories, the logical drawing
* boundaries and the physical surface handle. The physical handle
* is represented by an implementation-specific object which the
* caller must be able to recognize in order to render directly to
* the surface. Many of the physical handles will be usable only
* by native code which accesses platform-specific drawing interfaces.
*
* @version 1.6, 08/19/02
* @author Jim Graham
*/
public interface DrawingSurfaceInfo {
/**
* Lock the current state of the drawing surface in preparation
* for drawing to it and return an integer "change identifier"
* which can be used to determine when changes have occured to
* the drawing surface specification and when to retrieve new
* extent and physical handle data. If the identifier has not
* changed since the previous time lock and unlock were called
* then the consumer of this information is free to reuse clipping
* and handle information cached during the previous rendering
* operation. If the identifier changes, then all extent,
* clipping, and handle information must be retrieved again.
* The unlock() method must be called when rendering is complete
* or the component may be permanently locked down on the screen
* and other rendering threads may block indefinately.
*/
public int lock();
/**
* Unlock the drawing surface and allow other threads to
* access or change its composition.
*/
public void unlock();
/**
* Returns a rectangle describing the logical bounds of the given
* screen object relative to the "drawing handle" information
* returned by getSurface(). Note that there may be portions
* of this bounding rectangle that are obscured. This value
* defines the location of the logical upper-left origin of
* the component or screen object and its desired extents
* (which may differ from the clipping extents due to the
* presence of other overlapping screen objects). The getClip()
* method should be used to determine which portions of the
* drawing surface can actually be drawn to.
*/
public Rectangle getBounds();
/**
* Returns an implementation-specific object which describes a
* handle to the physical drawing surface on which this screen
* object resides. Depending on the type of the return value,
* this object may describe a Windows hWnd handle, an X11
* drawable handle, a Mac GrafPtr structure, or some other
* platform-specific handle.
*/
public PhysicalDrawingSurface getSurface();
/**
* Returns an explicit representation of the renderable portion
* of the given screen object. This clipping area will include
* only those areas of the screen object that are not obscured
* by other overlapping objects and which fall within the
* boundaries of the physical drawing surface. The area described
* by the return value of this method can be directly used as a
* graphics clip area to restrict rendering to the given screen
* object.
*/
public Shape getClip();
}