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 }