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/*
* Copyright 2022 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 "LayerCreationArgs.h"
#include <binder/IPCThreadState.h>
#include <private/android_filesystem_config.h>
#include "Client.h"
#include "gui/LayerMetadata.h"
namespace android::surfaceflinger {
std::atomic<uint32_t> LayerCreationArgs::sSequence{1};
std::atomic<uint32_t> LayerCreationArgs::sInternalSequence{1};
uint32_t LayerCreationArgs::getInternalLayerId(uint32_t id) {
return id | INTERNAL_LAYER_PREFIX;
}
LayerCreationArgs::LayerCreationArgs(SurfaceFlinger* flinger, sp<Client> client, std::string name,
uint32_t flags, gui::LayerMetadata metadataArg,
std::optional<uint32_t> id, bool internalLayer)
: flinger(flinger),
client(std::move(client)),
name(std::move(name)),
flags(flags),
metadata(std::move(metadataArg)) {
IPCThreadState* ipc = IPCThreadState::self();
ownerPid = ipc->getCallingPid();
uid_t callingUid = ipc->getCallingUid();
metadata.setInt32(gui::METADATA_CALLING_UID, static_cast<int32_t>(callingUid));
ownerUid = callingUid;
if (ownerUid == AID_GRAPHICS || ownerUid == AID_SYSTEM) {
// System can override the calling UID/PID since it can create layers on behalf of apps.
ownerPid = metadata.getInt32(gui::METADATA_OWNER_PID, ownerPid);
ownerUid = static_cast<uid_t>(
metadata.getInt32(gui::METADATA_OWNER_UID, static_cast<int32_t>(ownerUid)));
}
if (internalLayer) {
sequence = id.value_or(getInternalLayerId(sInternalSequence++));
} else if (id) {
sequence = *id;
sSequence = *id + 1;
} else {
sequence = sSequence++;
if (sequence >= INTERNAL_LAYER_PREFIX) {
sSequence = 1;
ALOGW("Layer sequence id rolled over.");
sequence = sSequence++;
}
}
}
LayerCreationArgs::LayerCreationArgs(std::optional<uint32_t> id, bool internalLayer)
: LayerCreationArgs(nullptr, nullptr, /*name=*/"", /*flags=*/0, /*metadata=*/{}, id,
internalLayer) {}
LayerCreationArgs LayerCreationArgs::fromOtherArgs(const LayerCreationArgs& other) {
// returns a new instance of LayerCreationArgs with a unique id.
return LayerCreationArgs(other.flinger, other.client, other.name, other.flags, other.metadata);
}
std::string LayerCreationArgs::getDebugString() const {
std::stringstream stream;
stream << "LayerCreationArgs{" << name << "[" << sequence << "] flags=" << flags
<< " pid=" << ownerPid << " uid=" << ownerUid;
if (addToRoot) {
stream << " addToRoot=" << addToRoot;
}
if (parentId != UNASSIGNED_LAYER_ID) {
stream << " parentId=" << parentId;
}
if (layerIdToMirror != UNASSIGNED_LAYER_ID) {
stream << " layerIdToMirror=" << layerIdToMirror;
}
if (layerStackToMirror != ui::INVALID_LAYER_STACK) {
stream << " layerStackToMirror=" << layerStackToMirror.id;
}
return stream.str();
}
} // namespace android::surfaceflinger
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