1 /*
2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 #ifndef _JAVASOFT_JAWT_H_
27 #define _JAVASOFT_JAWT_H_
28
29 #include "jni.h"
30
31 #ifdef __cplusplus
32 extern "C" {
33 #endif
34
35 /*
36 * AWT native interface (new in JDK 1.3)
37 *
38 * The AWT native interface allows a native C or C++ application a means
39 * by which to access native structures in AWT. This is to facilitate moving
40 * legacy C and C++ applications to Java and to target the needs of the
41 * community who, at present, wish to do their own native rendering to canvases
42 * for performance reasons. Standard extensions such as Java3D also require a
43 * means to access the underlying native data structures of AWT.
44 *
45 * There may be future extensions to this API depending on demand.
46 *
47 * A VM does not have to implement this API in order to pass the JCK.
48 * It is recommended, however, that this API is implemented on VMs that support
49 * standard extensions, such as Java3D.
50 *
51 * Since this is a native API, any program which uses it cannot be considered
52 * 100% pure java.
53 */
54
55 /*
56 * AWT Native Drawing Surface (JAWT_DrawingSurface).
57 *
58 * For each platform, there is a native drawing surface structure. This
59 * platform-specific structure can be found in jawt_md.h. It is recommended
60 * that additional platforms follow the same model. It is also recommended
61 * that VMs on Win32 and Solaris support the existing structures in jawt_md.h.
62 *
63 *******************
64 * EXAMPLE OF USAGE:
65 *******************
66 *
67 * In Win32, a programmer wishes to access the HWND of a canvas to perform
68 * native rendering into it. The programmer has declared the paint() method
69 * for their canvas subclass to be native:
70 *
71 *
72 * MyCanvas.java:
73 *
74 * import java.awt.*;
75 *
76 * public class MyCanvas extends Canvas {
77 *
78 * static {
79 * System.loadLibrary("mylib");
80 * }
81 *
82 * public native void paint(Graphics g);
83 * }
84 *
85 *
86 * myfile.c:
87 *
88 * #include "jawt_md.h"
89 * #include <assert.h>
90 *
91 * JNIEXPORT void JNICALL
92 * Java_MyCanvas_paint(JNIEnv* env, jobject canvas, jobject graphics)
93 * {
94 * JAWT awt;
95 * JAWT_DrawingSurface* ds;
96 * JAWT_DrawingSurfaceInfo* dsi;
97 * JAWT_Win32DrawingSurfaceInfo* dsi_win;
98 * jboolean result;
99 * jint lock;
100 *
101 * // Get the AWT
102 * awt.version = JAWT_VERSION_1_3;
103 * result = JAWT_GetAWT(env, &awt);
104 * assert(result != JNI_FALSE);
105 *
106 * // Get the drawing surface
107 * ds = awt.GetDrawingSurface(env, canvas);
108 * assert(ds != NULL);
109 *
110 * // Lock the drawing surface
111 * lock = ds->Lock(ds);
112 * assert((lock & JAWT_LOCK_ERROR) == 0);
113 *
114 * // Get the drawing surface info
115 * dsi = ds->GetDrawingSurfaceInfo(ds);
116 *
117 * // Get the platform-specific drawing info
118 * dsi_win = (JAWT_Win32DrawingSurfaceInfo*)dsi->platformInfo;
119 *
120 * //////////////////////////////
121 * // !!! DO PAINTING HERE !!! //
122 * //////////////////////////////
123 *
124 * // Free the drawing surface info
125 * ds->FreeDrawingSurfaceInfo(dsi);
126 *
127 * // Unlock the drawing surface
128 * ds->Unlock(ds);
129 *
130 * // Free the drawing surface
131 * awt.FreeDrawingSurface(ds);
132 * }
133 *
134 */
135
136 /*
137 * JAWT_Rectangle
138 * Structure for a native rectangle.
139 */
140 typedef struct jawt_Rectangle {
141 jint x;
142 jint y;
143 jint width;
144 jint height;
145 } JAWT_Rectangle;
146
147 struct jawt_DrawingSurface;
148
149 /*
150 * JAWT_DrawingSurfaceInfo
151 * Structure for containing the underlying drawing information of a component.
152 */
153 typedef struct jawt_DrawingSurfaceInfo {
154 /*
155 * Pointer to the platform-specific information. This can be safely
156 * cast to a JAWT_Win32DrawingSurfaceInfo on Windows or a
157 * JAWT_X11DrawingSurfaceInfo on Solaris. On Mac OS X this is a
158 * pointer to a NSObject that conforms to the JAWT_SurfaceLayers
159 * protocol. See jawt_md.h for details.
160 */
161 void* platformInfo;
162 /* Cached pointer to the underlying drawing surface */
163 struct jawt_DrawingSurface* ds;
164 /* Bounding rectangle of the drawing surface */
165 JAWT_Rectangle bounds;
166 /* Number of rectangles in the clip */
167 jint clipSize;
168 /* Clip rectangle array */
169 JAWT_Rectangle* clip;
170 } JAWT_DrawingSurfaceInfo;
171
172 #define JAWT_LOCK_ERROR 0x00000001
173 #define JAWT_LOCK_CLIP_CHANGED 0x00000002
174 #define JAWT_LOCK_BOUNDS_CHANGED 0x00000004
175 #define JAWT_LOCK_SURFACE_CHANGED 0x00000008
176
177 /*
178 * JAWT_DrawingSurface
179 * Structure for containing the underlying drawing information of a component.
180 * All operations on a JAWT_DrawingSurface MUST be performed from the same
181 * thread as the call to GetDrawingSurface.
182 */
183 typedef struct jawt_DrawingSurface {
184 /*
185 * Cached reference to the Java environment of the calling thread.
186 * If Lock(), Unlock(), GetDrawingSurfaceInfo() or
187 * FreeDrawingSurfaceInfo() are called from a different thread,
188 * this data member should be set before calling those functions.
189 */
190 JNIEnv* env;
191 /* Cached reference to the target object */
192 jobject target;
193 /*
194 * Lock the surface of the target component for native rendering.
195 * When finished drawing, the surface must be unlocked with
196 * Unlock(). This function returns a bitmask with one or more of the
197 * following values:
198 *
199 * JAWT_LOCK_ERROR - When an error has occurred and the surface could not
200 * be locked.
201 *
202 * JAWT_LOCK_CLIP_CHANGED - When the clip region has changed.
203 *
204 * JAWT_LOCK_BOUNDS_CHANGED - When the bounds of the surface have changed.
205 *
206 * JAWT_LOCK_SURFACE_CHANGED - When the surface itself has changed
207 */
208 jint (JNICALL *Lock)
209 (struct jawt_DrawingSurface* ds);
210 /*
211 * Get the drawing surface info.
212 * The value returned may be cached, but the values may change if
213 * additional calls to Lock() or Unlock() are made.
214 * Lock() must be called before this can return a valid value.
215 * Returns NULL if an error has occurred.
216 * When finished with the returned value, FreeDrawingSurfaceInfo must be
217 * called.
218 */
219 JAWT_DrawingSurfaceInfo* (JNICALL *GetDrawingSurfaceInfo)
220 (struct jawt_DrawingSurface* ds);
221 /*
222 * Free the drawing surface info.
223 */
224 void (JNICALL *FreeDrawingSurfaceInfo)
225 (JAWT_DrawingSurfaceInfo* dsi);
226 /*
227 * Unlock the drawing surface of the target component for native rendering.
228 */
229 void (JNICALL *Unlock)
230 (struct jawt_DrawingSurface* ds);
231 } JAWT_DrawingSurface;
232
233 /*
234 * JAWT
235 * Structure for containing native AWT functions.
236 */
237 typedef struct jawt {
238 /*
239 * Version of this structure. This must always be set before
240 * calling JAWT_GetAWT()
241 */
242 jint version;
243 /*
244 * Return a drawing surface from a target jobject. This value
245 * may be cached.
246 * Returns NULL if an error has occurred.
247 * Target must be a java.awt.Component (should be a Canvas
248 * or Window for native rendering).
249 * FreeDrawingSurface() must be called when finished with the
250 * returned JAWT_DrawingSurface.
251 */
252 JAWT_DrawingSurface* (JNICALL *GetDrawingSurface)
253 (JNIEnv* env, jobject target);
254 /*
255 * Free the drawing surface allocated in GetDrawingSurface.
256 */
257 void (JNICALL *FreeDrawingSurface)
258 (JAWT_DrawingSurface* ds);
259 /*
260 * Since 1.4
261 * Locks the entire AWT for synchronization purposes
262 */
263 void (JNICALL *Lock)(JNIEnv* env);
264 /*
265 * Since 1.4
266 * Unlocks the entire AWT for synchronization purposes
267 */
268 void (JNICALL *Unlock)(JNIEnv* env);
269 /*
270 * Since 1.4
271 * Returns a reference to a java.awt.Component from a native
272 * platform handle. On Windows, this corresponds to an HWND;
273 * on Solaris and Linux, this is a Drawable. For other platforms,
274 * see the appropriate machine-dependent header file for a description.
275 * The reference returned by this function is a local
276 * reference that is only valid in this environment.
277 * This function returns a NULL reference if no component could be
278 * found with matching platform information.
279 */
280 jobject (JNICALL *GetComponent)(JNIEnv* env, void* platformInfo);
281
282 } JAWT;
283
284 /*
285 * Get the AWT native structure. This function returns JNI_FALSE if
286 * an error occurs.
287 */
288 _JNI_IMPORT_OR_EXPORT_
289 jboolean JNICALL JAWT_GetAWT(JNIEnv* env, JAWT* awt);
290
291 #define JAWT_VERSION_1_3 0x00010003
292 #define JAWT_VERSION_1_4 0x00010004
293 #define JAWT_VERSION_1_7 0x00010007
294
295 #ifdef __cplusplus
296 } /* extern "C" */
297 #endif
298
299 #endif /* !_JAVASOFT_JAWT_H_ */