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Java example source code file (awt_DrawingSurface.m)

This example Java source code file (awt_DrawingSurface.m) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awtsurfacelayers, jawt_drawingsurface, jawt_drawingsurface\*, jawt_drawingsurfaceinfo, jnf_class_cache, jnf_member_cache, jnfgetintfield, jnfgetobjectfield, jnicall, jnienv, jniexport, ljava\/awt\/peer\/componentpeer, lsun\/lwawt\/platformcomponent, null

The awt_DrawingSurface.m Java example source code

/*
 * Copyright (c) 2011, 2012, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#import <JavaNativeFoundation/JavaNativeFoundation.h>

#import "AWTSurfaceLayers.h"

JNIEXPORT JAWT_DrawingSurfaceInfo* JNICALL awt_DrawingSurface_GetDrawingSurfaceInfo
(JAWT_DrawingSurface* ds)
{
    JAWT_DrawingSurfaceInfo* dsi = (JAWT_DrawingSurfaceInfo*)malloc(sizeof(JAWT_DrawingSurfaceInfo));

    JNIEnv *env = ds->env;
    jobject target = ds->target;

    static JNF_CLASS_CACHE(jc_Component, "java/awt/Component");
    static JNF_MEMBER_CACHE(jf_peer, jc_Component, "peer", "Ljava/awt/peer/ComponentPeer;");
    jobject peer = JNFGetObjectField(env, target, jf_peer);

    static JNF_CLASS_CACHE(jc_ComponentPeer, "sun/lwawt/LWComponentPeer");
    static JNF_MEMBER_CACHE(jf_platformComponent, jc_ComponentPeer,
                            "platformComponent", "Lsun/lwawt/PlatformComponent;");
    jobject platformComponent = JNFGetObjectField(env, peer, jf_platformComponent);

    static JNF_CLASS_CACHE(jc_PlatformComponent, "sun/lwawt/macosx/CPlatformComponent");
    static JNF_MEMBER_CACHE(jm_getPointer, jc_PlatformComponent, "getPointer", "()J");
    AWTSurfaceLayers *surfaceLayers = jlong_to_ptr(JNFCallLongMethod(env, platformComponent, jm_getPointer));
    // REMIND: assert(surfaceLayers)

    dsi->platformInfo = surfaceLayers;
    dsi->ds = ds;

    static JNF_MEMBER_CACHE(jf_x, jc_Component, "x", "I");
    static JNF_MEMBER_CACHE(jf_y, jc_Component, "y", "I");
    static JNF_MEMBER_CACHE(jf_width, jc_Component, "width", "I");
    static JNF_MEMBER_CACHE(jf_height, jc_Component, "height", "I");

    dsi->bounds.x = JNFGetIntField(env, target, jf_x);
    dsi->bounds.y = JNFGetIntField(env, target, jf_y);
    dsi->bounds.width = JNFGetIntField(env, target, jf_width);
    dsi->bounds.height = JNFGetIntField(env, target, jf_height);

    dsi->clipSize = 1;
    dsi->clip = &(dsi->bounds);

    return dsi;
}

JNIEXPORT jint JNICALL awt_DrawingSurface_Lock
(JAWT_DrawingSurface* ds)
{
    // TODO: implement
    return 0;
}

JNIEXPORT void JNICALL awt_DrawingSurface_Unlock
(JAWT_DrawingSurface* ds)
{
    // TODO: implement
}

JNIEXPORT void JNICALL awt_DrawingSurface_FreeDrawingSurfaceInfo
(JAWT_DrawingSurfaceInfo* dsi)
{
    free(dsi);
}

JNIEXPORT JAWT_DrawingSurface* JNICALL awt_GetDrawingSurface
(JNIEnv* env, jobject target)
{
    JAWT_DrawingSurface* ds = (JAWT_DrawingSurface*)malloc(sizeof(JAWT_DrawingSurface));

    // TODO: "target instanceof" check

    ds->env = env;
    ds->target = (*env)->NewGlobalRef(env, target);
    ds->Lock = awt_DrawingSurface_Lock;
    ds->GetDrawingSurfaceInfo = awt_DrawingSurface_GetDrawingSurfaceInfo;
    ds->FreeDrawingSurfaceInfo = awt_DrawingSurface_FreeDrawingSurfaceInfo;
    ds->Unlock = awt_DrawingSurface_Unlock;

    return ds;
}

JNIEXPORT void JNICALL awt_FreeDrawingSurface
(JAWT_DrawingSurface* ds)
{
    JNIEnv *env = ds->env;
    (*env)->DeleteGlobalRef(env, ds->target);
    free(ds);
}

JNIEXPORT void JNICALL awt_Lock
(JNIEnv* env)
{
    // TODO: implement
}

JNIEXPORT void JNICALL awt_Unlock
(JNIEnv* env)
{
    // TODO: implement
}

JNIEXPORT jobject JNICALL awt_GetComponent
(JNIEnv* env, void* platformInfo)
{
    // TODO: implement
    return NULL;
}

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