1 /*

     2  * Copyright (c) 2002, 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 #include "sun_awt_windows_WBufferStrategy.h"

    27 #include "jni_util.h"

    28 

    29 

    30 static jmethodID getBackBufferID;

    31 

    32 /*

    33  * Class:     sun_awt_windows_WBufferStrategy

    34  * Method:    initIDs

    35  * Signature: (Ljava/lang/Class;)V

    36  */

    37 JNIEXPORT void JNICALL

    38 Java_sun_awt_windows_WBufferStrategy_initIDs(JNIEnv *env, jclass wbs,

    39                                              jclass componentClass)

    40 {

    41     getBackBufferID = env->GetMethodID(componentClass, "getBackBuffer",

    42                                        "()Ljava/awt/Image;");

    43 }

    44 

    45 /**

    46  * Native method of WBufferStrategy.java.  Given a Component

    47  * object, this method will find the back buffer associated

    48  * with the Component's BufferStrategy and return a handle

    49  * to it.

    50  */

    51 extern "C" JNIEXPORT jobject JNICALL

    52 Java_sun_awt_windows_WBufferStrategy_getDrawBuffer(JNIEnv *env, jclass wbs,

    53                                                    jobject component)

    54 {

    55     if (!JNU_IsNull(env, getBackBufferID)) {

    56         return env->CallObjectMethod(component, getBackBufferID);

    57     } else {

    58         return NULL;

    59     }

    60 }