core/jni/android_graphics_BLASTBufferQueue.cpp

/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define LOG_TAG "BLASTBufferQueue"

#include <nativehelper/JNIHelp.h>

#include <android_runtime/AndroidRuntime.h>
#include <android_runtime/android_view_Surface.h>
#include <utils/Log.h>
#include <utils/RefBase.h>

#include <gui/BLASTBufferQueue.h>
#include <gui/Surface.h>
#include <gui/SurfaceComposerClient.h>

namespace android {

static jlong nativeCreate(JNIEnv* env, jclass clazz, jlong surfaceControl, jlong width, jlong height,
                          jboolean enableTripleBuffering) {
    sp<BLASTBufferQueue> queue = new BLASTBufferQueue(
            reinterpret_cast<SurfaceControl*>(surfaceControl), width, height, enableTripleBuffering);
    queue->incStrong((void*)nativeCreate);
    return reinterpret_cast<jlong>(queue.get());
}

static void nativeDestroy(JNIEnv* env, jclass clazz, jlong ptr) {
    sp<BLASTBufferQueue> queue = reinterpret_cast<BLASTBufferQueue*>(ptr);
    queue->decStrong((void*)nativeCreate);
}

static jobject nativeGetSurface(JNIEnv* env, jclass clazz, jlong ptr) {
    sp<BLASTBufferQueue> queue = reinterpret_cast<BLASTBufferQueue*>(ptr);
    return android_view_Surface_createFromIGraphicBufferProducer(env, queue->getIGraphicBufferProducer());
}

static void nativeSetNextTransaction(JNIEnv* env, jclass clazz, jlong ptr, jlong transactionPtr) {
    sp<BLASTBufferQueue> queue = reinterpret_cast<BLASTBufferQueue*>(ptr);
    auto transaction = reinterpret_cast<SurfaceComposerClient::Transaction*>(transactionPtr);
    queue->setNextTransaction(transaction);
}

static void nativeUpdate(JNIEnv*env, jclass clazz, jlong ptr, jlong surfaceControl, jlong width, jlong height) {
    sp<BLASTBufferQueue> queue = reinterpret_cast<BLASTBufferQueue*>(ptr);
    queue->update(reinterpret_cast<SurfaceControl*>(surfaceControl), width, height);
}

static const JNINativeMethod gMethods[] = {
    /* name, signature, funcPtr */
    { "nativeCreate", "(JJJZ)J",
            (void*)nativeCreate },
    {  "nativeGetSurface", "(J)Landroid/view/Surface;",
       (void*)nativeGetSurface },
    { "nativeDestroy", "(J)V",
            (void*)nativeDestroy },
    { "nativeSetNextTransaction", "(JJ)V",
      (void*)nativeSetNextTransaction },
    { "nativeUpdate", "(JJJJ)V",
      (void*)nativeUpdate }
};

int register_android_graphics_BLASTBufferQueue(JNIEnv* env) {
    int res = jniRegisterNativeMethods(env, "android/graphics/BLASTBufferQueue",
            gMethods, NELEM(gMethods));
    LOG_ALWAYS_FATAL_IF(res < 0, "Unable to register native methods.");

    return 0;
}

} // namespace android