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/*
* Copyright (C) 2012 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.
*/
#include <stdint.h>
#include <sys/types.h>
#include <binder/PermissionCache.h>
#include <binder/IPCThreadState.h>
#include <private/android_filesystem_config.h>
#include "Client.h"
#include "Layer.h"
#include "SurfaceFlinger.h"
namespace android {
// ---------------------------------------------------------------------------
const String16 sAccessSurfaceFlinger("android.permission.ACCESS_SURFACE_FLINGER");
// ---------------------------------------------------------------------------
Client::Client(const sp<SurfaceFlinger>& flinger)
: Client(flinger, nullptr)
{
}
Client::Client(const sp<SurfaceFlinger>& flinger, const sp<Layer>& parentLayer)
: mFlinger(flinger),
mParentLayer(parentLayer)
{
}
Client::~Client()
{
const size_t count = mLayers.size();
for (size_t i=0 ; i<count ; i++) {
sp<Layer> l = mLayers.valueAt(i).promote();
if (l != nullptr) {
mFlinger->removeLayer(l);
}
}
}
void Client::setParentLayer(const sp<Layer>& parentLayer) {
Mutex::Autolock _l(mLock);
mParentLayer = parentLayer;
}
sp<Layer> Client::getParentLayer(bool* outParentDied) const {
Mutex::Autolock _l(mLock);
sp<Layer> parent = mParentLayer.promote();
if (outParentDied != nullptr) {
*outParentDied = (mParentLayer != nullptr && parent == nullptr);
}
return parent;
}
status_t Client::initCheck() const {
return NO_ERROR;
}
void Client::attachLayer(const sp<IBinder>& handle, const sp<Layer>& layer)
{
Mutex::Autolock _l(mLock);
mLayers.add(handle, layer);
}
void Client::detachLayer(const Layer* layer)
{
Mutex::Autolock _l(mLock);
// we do a linear search here, because this doesn't happen often
const size_t count = mLayers.size();
for (size_t i=0 ; i<count ; i++) {
if (mLayers.valueAt(i) == layer) {
mLayers.removeItemsAt(i, 1);
break;
}
}
}
sp<Layer> Client::getLayerUser(const sp<IBinder>& handle) const
{
Mutex::Autolock _l(mLock);
sp<Layer> lbc;
wp<Layer> layer(mLayers.valueFor(handle));
if (layer != 0) {
lbc = layer.promote();
ALOGE_IF(lbc==0, "getLayerUser(name=%p) is dead", handle.get());
}
return lbc;
}
status_t Client::onTransact(
uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
// these must be checked
IPCThreadState* ipc = IPCThreadState::self();
const int pid = ipc->getCallingPid();
const int uid = ipc->getCallingUid();
const int self_pid = getpid();
// If we are called from another non root process without the GRAPHICS, SYSTEM, or ROOT
// uid we require the sAccessSurfaceFlinger permission.
// We grant an exception in the case that the Client has a "parent layer", as its
// effects will be scoped to that layer.
if (CC_UNLIKELY(pid != self_pid && uid != AID_GRAPHICS && uid != AID_SYSTEM && uid != 0)
&& (getParentLayer() == nullptr)) {
// we're called from a different process, do the real check
if (!PermissionCache::checkCallingPermission(sAccessSurfaceFlinger))
{
ALOGE("Permission Denial: "
"can't openGlobalTransaction pid=%d, uid<=%d", pid, uid);
return PERMISSION_DENIED;
}
}
return BnSurfaceComposerClient::onTransact(code, data, reply, flags);
}
status_t Client::createSurface(
const String8& name,
uint32_t w, uint32_t h, PixelFormat format, uint32_t flags,
const sp<IBinder>& parentHandle, uint32_t windowType, uint32_t ownerUid,
sp<IBinder>* handle,
sp<IGraphicBufferProducer>* gbp)
{
sp<Layer> parent = nullptr;
if (parentHandle != nullptr) {
parent = getLayerUser(parentHandle);
if (parent == nullptr) {
return NAME_NOT_FOUND;
}
}
if (parent == nullptr) {
bool parentDied;
parent = getParentLayer(&parentDied);
// If we had a parent, but it died, we've lost all
// our capabilities.
if (parentDied) {
return NAME_NOT_FOUND;
}
}
/*
* createSurface must be called from the GL thread so that it can
* have access to the GL context.
*/
class MessageCreateLayer : public MessageBase {
SurfaceFlinger* flinger;
Client* client;
sp<IBinder>* handle;
sp<IGraphicBufferProducer>* gbp;
status_t result;
const String8& name;
uint32_t w, h;
PixelFormat format;
uint32_t flags;
sp<Layer>* parent;
uint32_t windowType;
uint32_t ownerUid;
public:
MessageCreateLayer(SurfaceFlinger* flinger,
const String8& name, Client* client,
uint32_t w, uint32_t h, PixelFormat format, uint32_t flags,
sp<IBinder>* handle, uint32_t windowType, uint32_t ownerUid,
sp<IGraphicBufferProducer>* gbp,
sp<Layer>* parent)
: flinger(flinger), client(client),
handle(handle), gbp(gbp), result(NO_ERROR),
name(name), w(w), h(h), format(format), flags(flags),
parent(parent), windowType(windowType), ownerUid(ownerUid) {
}
status_t getResult() const { return result; }
virtual bool handler() {
result = flinger->createLayer(name, client, w, h, format, flags,
windowType, ownerUid, handle, gbp, parent);
return true;
}
};
sp<MessageBase> msg = new MessageCreateLayer(mFlinger.get(),
name, this, w, h, format, flags, handle,
windowType, ownerUid, gbp, &parent);
mFlinger->postMessageSync(msg);
return static_cast<MessageCreateLayer*>( msg.get() )->getResult();
}
status_t Client::destroySurface(const sp<IBinder>& handle) {
return mFlinger->onLayerRemoved(this, handle);
}
status_t Client::clearLayerFrameStats(const sp<IBinder>& handle) const {
sp<Layer> layer = getLayerUser(handle);
if (layer == NULL) {
return NAME_NOT_FOUND;
}
layer->clearFrameStats();
return NO_ERROR;
}
status_t Client::getLayerFrameStats(const sp<IBinder>& handle, FrameStats* outStats) const {
sp<Layer> layer = getLayerUser(handle);
if (layer == NULL) {
return NAME_NOT_FOUND;
}
layer->getFrameStats(outStats);
return NO_ERROR;
}
// ---------------------------------------------------------------------------
}; // namespace android
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