/*
* Copyright (c) 1999, 2017, 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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*/
#ifndef _JAVASOFT_JAWT_H_
#define _JAVASOFT_JAWT_H_
#include "jni.h"
#ifdef __cplusplus
extern "C" {
#endif
/*
* AWT native interface.
*
* 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
* developers who need to do their own native rendering to canvases
* for performance or other reasons.
*
* Conversely it also provides mechanisms for an application which already
* has a native window to provide that to AWT for AWT rendering.
*
* Since every platform may be different in its native data structures
* and APIs for windowing systems the application must necessarily
* provided per-platform source and compile and deliver per-platform
* native code to use this API.
*
* These interfaces are not part of the Java SE specification and
* a VM is not required to implement this API. However it is strongly
* recommended that all implementations which support headful AWT
* also support these interfaces.
*
*/
/*
* 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 all platforms 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. Request version 9 to access features in that release.
* awt.version = JAWT_VERSION_9;
* 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 Linux and Solaris. On Mac OS X this is a
* pointer to a NSObject that conforms to the JAWT_SurfaceLayers
* protocol. 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(). It affects the functions returned.
* Must be one of the known pre-defined versions.
*/
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);
/**
* Since 9
* Creates a java.awt.Frame placed in a native container. Container is
* referenced by the native platform handle. For example on Windows this
* corresponds to an HWND. 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 frame could be
* created with matching platform information.
*/
jobject (JNICALL *CreateEmbeddedFrame) (JNIEnv *env, void* platformInfo);
/**
* Since 9
* Moves and resizes the embedded frame. The new location of the top-left
* corner is specified by x and y parameters relative to the native parent
* component. The new size is specified by width and height.
*
* The embedded frame should be created by CreateEmbeddedFrame() method, or
* this function will not have any effect.
*
* java.awt.Component.setLocation() and java.awt.Component.setBounds() for
* EmbeddedFrame really don't move it within the native parent. These
* methods always locate the embedded frame at (0, 0) for backward
* compatibility. To allow moving embedded frames this method was
* introduced, and it works just the same way as setLocation() and
* setBounds() for usual, non-embedded components.
*
* Using usual get/setLocation() and get/setBounds() together with this new
* method is not recommended.
*/
void (JNICALL *SetBounds) (JNIEnv *env, jobject embeddedFrame,
jint x, jint y, jint w, jint h);
/**
* Since 9
* Synthesize a native message to activate or deactivate an EmbeddedFrame
* window depending on the value of parameter doActivate, if "true"
* activates the window; otherwise, deactivates the window.
*
* The embedded frame should be created by CreateEmbeddedFrame() method, or
* this function will not have any effect.
*/
void (JNICALL *SynthesizeWindowActivation) (JNIEnv *env,
jobject embeddedFrame, jboolean doActivate);
} 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);
/*
* Specify one of these constants as the JAWT.version
* Specifying an earlier version will limit the available functions to
* those provided in that earlier version of JAWT.
* See the "Since" note on each API. Methods with no "Since"
* may be presumed to be present in JAWT_VERSION_1_3.
*/
#define JAWT_VERSION_1_3 0x00010003
#define JAWT_VERSION_1_4 0x00010004
#define JAWT_VERSION_1_7 0x00010007
#define JAWT_VERSION_9 0x00090000
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* !_JAVASOFT_JAWT_H_ */