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/*
**
** Copyright 2017, 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 "android_emulator_multidisplay_JNI"
#include <gui/BufferQueue.h>
#include <gui/BufferItemConsumer.h>
#include <gui/Surface.h>
#include <gui/ISurfaceComposer.h>
#include <gui/SurfaceComposerClient.h>
#include <sys/epoll.h>
#include <gralloc_cb_bp.h>
#include <qemu_pipe_bp.h>
#include "utils/Log.h"
#include "nativehelper/JNIHelp.h"
#include <nativehelper/ScopedLocalRef.h>
#include "jni.h"
#include "android_runtime/AndroidRuntime.h"
#include "android_runtime/android_view_Surface.h"
#define MAX_DISPLAYS 10
using namespace android;
static int gFd = 0;
static const uint8_t ADD = 1;
static const uint8_t DEL = 2;
static const uint8_t QUERY = 3;
static const uint8_t BIND = 4;
static void fillMsg(std::vector<uint8_t>& buf, uint8_t cmd, uint8_t* data, uint32_t size) {
// msg format is size(4B) + cmd(1B) + data(size B)
uint32_t totalSize = size + 1;
uint8_t* p = (uint8_t*)&totalSize;
buf.insert(buf.end(), p, p + 4);
buf.push_back(cmd);
if (data) {
buf.insert(buf.end(), data, data + size);
}
}
struct FrameListener : public ConsumerBase::FrameAvailableListener {
sp<BufferItemConsumer> mConsumer;
uint32_t mId;
uint32_t mCb;
public:
void onFrameAvailable(const BufferItem& item) override {
BufferItem bufferItem;
mConsumer->acquireBuffer(&bufferItem, 0);
ANativeWindowBuffer* b = bufferItem.mGraphicBuffer->getNativeBuffer();
if (b && b->handle) {
const cb_handle_t* cb = cb_handle_t::from(b->handle);
if (mCb != cb->hostHandle) {
ALOGI("sent cb %d", cb->hostHandle);
mCb = cb->hostHandle;
uint32_t data[] = {mId, mCb};
std::vector<uint8_t> buf;
fillMsg(buf, BIND, (uint8_t*)data, sizeof(data));
qemu_pipe_write_fully(gFd, buf.data(), buf.size());
}
}
else {
ALOGE("cannot get native buffer handler");
}
mConsumer->releaseBuffer(bufferItem);
}
void setDefaultBufferSize(uint32_t w, uint32_t h) {
mConsumer->setDefaultBufferSize(w, h);
}
FrameListener(sp<BufferItemConsumer>& consumer, uint32_t id)
: mConsumer(consumer), mId(id), mCb(0) { }
};
sp<FrameListener> gFrameListener[MAX_DISPLAYS + 1];
static jobject nativeCreateSurface(JNIEnv *env, jobject obj, jint id, jint width, jint height)
{
ALOGI("create surface for %d", id);
// Create surface for this new display
sp<IGraphicBufferProducer> producer;
sp<IGraphicBufferConsumer> consumer;
sp<BufferItemConsumer> bufferItemConsumer;
BufferQueue::createBufferQueue(&producer, &consumer);
bufferItemConsumer = new BufferItemConsumer(consumer, GRALLOC_USAGE_HW_RENDER);
gFrameListener[id] = new FrameListener(bufferItemConsumer, id);
gFrameListener[id]->setDefaultBufferSize(width, height);
bufferItemConsumer->setFrameAvailableListener(gFrameListener[id]);
return android_view_Surface_createFromIGraphicBufferProducer(env, producer);
}
static jint nativeOpen(JNIEnv* env, jobject obj) {
// Open pipe
gFd = qemu_pipe_open_ns(NULL, "multidisplay", O_RDWR);
if (gFd < 0) {
ALOGE("Error opening multidisplay pipe %d", gFd);
} else {
std::vector<uint8_t> buf;
fillMsg(buf, QUERY, nullptr, 0);
qemu_pipe_write_fully(gFd, buf.data(), buf.size());
ALOGI("multidisplay pipe connected!!!");
}
return gFd;
}
static bool nativeReadPipe(JNIEnv* env, jobject obj, jintArray arr) {
int* arrp = env->GetIntArrayElements(arr, 0);
uint32_t length;
qemu_pipe_read_fully(gFd, &length, sizeof(length));
std::vector<uint8_t> args(length, 0);
qemu_pipe_read_fully(gFd, args.data(), (size_t)length);
switch(args[0]) {
case ADD: {
ALOGV("received add event");
*arrp = ADD;
for (int i = 1; i < 6; i++) {
*(arrp + i) = *(uint32_t*)(&args[(i - 1) * 4 + 1]);
}
env->ReleaseIntArrayElements(arr, arrp, JNI_COMMIT);
break;
}
case DEL: {
ALOGV("received del event");
*arrp = DEL;
*(arrp + 1) = *(uint32_t*)(&args[1]);
env->ReleaseIntArrayElements(arr, arrp, JNI_COMMIT);
break;
}
default: {
ALOGE("unexpected event %d", args[0]);
return false;
}
}
return true;
}
static bool nativeReleaseListener(JNIEnv* env, jobject obj, jint id) {
if (gFrameListener[id].get()) {
ALOGV("clear gFrameListener %d", id);
gFrameListener[id].clear();
gFrameListener[id] = nullptr;
}
return true;
}
static bool nativeResizeListener(JNIEnv* env, jobject obj, jint id, jint w, jint h) {
if (gFrameListener[id]) {
gFrameListener[id]->setDefaultBufferSize(w, h);
return true;
}
return false;
}
static JNINativeMethod sMethods[] = {
{ "nativeOpen", "()I", (void*) nativeOpen },
{ "nativeCreateSurface", "(III)Landroid/view/Surface;", (void*) nativeCreateSurface },
{ "nativeReadPipe", "([I)Z", (void*) nativeReadPipe},
{ "nativeReleaseListener", "(I)Z", (void*) nativeReleaseListener},
{ "nativeResizeListener", "(III)Z", (void*) nativeResizeListener},
};
/*
* JNI Initialization
*/
jint JNI_OnLoad(JavaVM *jvm, void *reserved)
{
JNIEnv *env;
// Check JNI version
if (jvm->GetEnv((void **)&env, JNI_VERSION_1_6)) {
ALOGE("JNI version mismatch error");
return JNI_ERR;
}
jniRegisterNativeMethods(env, "com/android/emulator/multidisplay/MultiDisplayService",
sMethods, NELEM(sMethods));
return JNI_VERSION_1_6;
}
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