/*

 * 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

 * particular file as subject to the "Classpath" exception as provided

 *

 * 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.

 *

 */

#ifndef _JAVASOFT_JAWT_H_

#define _JAVASOFT_JAWT_H_

#include "jni.h"

#ifdef __cplusplus

extern "C" {

#endif

/*

 * AWT native interface (new in JDK 1.3)

 *

 * The AWT native interface allows a native C or C++ application a means

 * by which to access native structures in AWT.  This is to facilitate moving

 * legacy C and C++ applications to Java and to target the needs of the

 * community who, at present, wish to do their own native rendering to canvases

 * for performance reasons.  Standard extensions such as Java3D also require a

 * means to access the underlying native data structures of AWT.

 *

 * There may be future extensions to this API depending on demand.

 *

 * A VM does not have to implement this API in order to pass the JCK.

 * It is recommended, however, that this API is implemented on VMs that support

 * standard extensions, such as Java3D.

 *

 * Since this is a native API, any program which uses it cannot be considered

 * 100% pure java.

 */

/*

 * AWT Native Drawing Surface (JAWT_DrawingSurface).

 *

 * For each platform, there is a native drawing surface structure.  This

 * platform-specific structure can be found in jawt_md.h.  It is recommended

 * that additional platforms follow the same model.  It is also recommended

 * that VMs on Win32 and Solaris support the existing structures in jawt_md.h.

 *

 *******************

 * EXAMPLE OF USAGE:

 *******************

 *

 * In Win32, a programmer wishes to access the HWND of a canvas to perform

 * native rendering into it.  The programmer has declared the paint() method

 * for their canvas subclass to be native:

 *

 *

 * MyCanvas.java:

 *

 * import java.awt.*;

 *

 * public class MyCanvas extends Canvas {

 *

 *     static {

 *         System.loadLibrary("mylib");

 *     }

 *

 *     public native void paint(Graphics g);

 * }

 *

 *

 * myfile.c:

 *

 * #include "jawt_md.h"

 * #include <assert.h>

 *

 * JNIEXPORT void JNICALL

 * Java_MyCanvas_paint(JNIEnv* env, jobject canvas, jobject graphics)

 * {

 *     JAWT awt;

 *     JAWT_DrawingSurface* ds;

 *     JAWT_DrawingSurfaceInfo* dsi;

 *     JAWT_Win32DrawingSurfaceInfo* dsi_win;

 *     jboolean result;

 *     jint lock;

 *

 *     // Get the AWT

 *     awt.version = JAWT_VERSION_1_3;

 *     result = JAWT_GetAWT(env, &awt);

 *     assert(result != JNI_FALSE);

 *

 *     // Get the drawing surface

 *     ds = awt.GetDrawingSurface(env, canvas);

 *     assert(ds != NULL);

 *

 *     // Lock the drawing surface

 *     lock = ds->Lock(ds);

 *     assert((lock & JAWT_LOCK_ERROR) == 0);

 *

 *     // Get the drawing surface info

 *     dsi = ds->GetDrawingSurfaceInfo(ds);

 *

 *     // Get the platform-specific drawing info

 *     dsi_win = (JAWT_Win32DrawingSurfaceInfo*)dsi->platformInfo;

 *

 *     //////////////////////////////

 *     // !!! DO PAINTING HERE !!! //

 *     //////////////////////////////

 *

 *     // Free the drawing surface info

 *     ds->FreeDrawingSurfaceInfo(dsi);

 *

 *     // Unlock the drawing surface

 *     ds->Unlock(ds);

 *

 *     // Free the drawing surface

 *     awt.FreeDrawingSurface(ds);

 * }

 *

 */

/*

 * JAWT_Rectangle

 * Structure for a native rectangle.

 */

typedef struct jawt_Rectangle {

    jint x;

    jint y;

    jint width;

    jint height;

} JAWT_Rectangle;

struct jawt_DrawingSurface;

/*

 * JAWT_DrawingSurfaceInfo

 * Structure for containing the underlying drawing information of a component.

 */

typedef struct jawt_DrawingSurfaceInfo {

    /*

     * Pointer to the platform-specific information.  This can be safely

     * cast to a JAWT_Win32DrawingSurfaceInfo on Windows or a

     * JAWT_X11DrawingSurfaceInfo on Solaris.  See jawt_md.h for details.

     */

    void* platformInfo;

    /* Cached pointer to the underlying drawing surface */

    struct jawt_DrawingSurface* ds;

    /* Bounding rectangle of the drawing surface */

    JAWT_Rectangle bounds;

    /* Number of rectangles in the clip */

    jint clipSize;

    /* Clip rectangle array */

    JAWT_Rectangle* clip;

} JAWT_DrawingSurfaceInfo;

#define JAWT_LOCK_ERROR                 0x00000001

#define JAWT_LOCK_CLIP_CHANGED          0x00000002

#define JAWT_LOCK_BOUNDS_CHANGED        0x00000004

#define JAWT_LOCK_SURFACE_CHANGED       0x00000008

/*

 * JAWT_DrawingSurface

 * Structure for containing the underlying drawing information of a component.

 * All operations on a JAWT_DrawingSurface MUST be performed from the same

 * thread as the call to GetDrawingSurface.

 */

typedef struct jawt_DrawingSurface {

    /*

     * Cached reference to the Java environment of the calling thread.

     * If Lock(), Unlock(), GetDrawingSurfaceInfo() or

     * FreeDrawingSurfaceInfo() are called from a different thread,

     * this data member should be set before calling those functions.

     */

    JNIEnv* env;

    /* Cached reference to the target object */

    jobject target;

    /*

     * Lock the surface of the target component for native rendering.

     * When finished drawing, the surface must be unlocked with

     * Unlock().  This function returns a bitmask with one or more of the

     * following values:

     *

     * JAWT_LOCK_ERROR - When an error has occurred and the surface could not

     * be locked.

     *

     * JAWT_LOCK_CLIP_CHANGED - When the clip region has changed.

     *

     * JAWT_LOCK_BOUNDS_CHANGED - When the bounds of the surface have changed.

     *

     * JAWT_LOCK_SURFACE_CHANGED - When the surface itself has changed

     */

    jint (JNICALL *Lock)

        (struct jawt_DrawingSurface* ds);

    /*

     * Get the drawing surface info.

     * The value returned may be cached, but the values may change if

     * additional calls to Lock() or Unlock() are made.

     * Lock() must be called before this can return a valid value.

     * Returns NULL if an error has occurred.

     * When finished with the returned value, FreeDrawingSurfaceInfo must be

     * called.

     */

    JAWT_DrawingSurfaceInfo* (JNICALL *GetDrawingSurfaceInfo)

        (struct jawt_DrawingSurface* ds);

    /*

     * Free the drawing surface info.

     */

    void (JNICALL *FreeDrawingSurfaceInfo)

        (JAWT_DrawingSurfaceInfo* dsi);

    /*

     * Unlock the drawing surface of the target component for native rendering.

     */

    void (JNICALL *Unlock)

        (struct jawt_DrawingSurface* ds);

} JAWT_DrawingSurface;

/*

 * JAWT

 * Structure for containing native AWT functions.

 */

typedef struct jawt {

    /*

     * Version of this structure.  This must always be set before

     * calling JAWT_GetAWT()

     */

    jint version;

    /*

     * Return a drawing surface from a target jobject.  This value

     * may be cached.

     * Returns NULL if an error has occurred.

     * Target must be a java.awt.Component (should be a Canvas

     * or Window for native rendering).

     * FreeDrawingSurface() must be called when finished with the

     * returned JAWT_DrawingSurface.

     */

    JAWT_DrawingSurface* (JNICALL *GetDrawingSurface)

        (JNIEnv* env, jobject target);

    /*

     * Free the drawing surface allocated in GetDrawingSurface.

     */

    void (JNICALL *FreeDrawingSurface)

        (JAWT_DrawingSurface* ds);

    /*

     * Since 1.4

     * Locks the entire AWT for synchronization purposes

     */

    void (JNICALL *Lock)(JNIEnv* env);

    /*

     * Since 1.4

     * Unlocks the entire AWT for synchronization purposes

     */

    void (JNICALL *Unlock)(JNIEnv* env);

    /*

     * Since 1.4

     * Returns a reference to a java.awt.Component from a native

     * platform handle.  On Windows, this corresponds to an HWND;

     * on Solaris and Linux, this is a Drawable.  For other platforms,

     * see the appropriate machine-dependent header file for a description.

     * The reference returned by this function is a local

     * reference that is only valid in this environment.

     * This function returns a NULL reference if no component could be

     * found with matching platform information.

     */

    jobject (JNICALL *GetComponent)(JNIEnv* env, void* platformInfo);

} JAWT;

/*

 * Get the AWT native structure.  This function returns JNI_FALSE if

 * an error occurs.

 */

_JNI_IMPORT_OR_EXPORT_

jboolean JNICALL JAWT_GetAWT(JNIEnv* env, JAWT* awt);

#define JAWT_VERSION_1_3 0x00010003

#define JAWT_VERSION_1_4 0x00010004

#ifdef __cplusplus

} /* extern "C" */

#endif

#endif /* !_JAVASOFT_JAWT_H_ */