blob: 315fba8a3d862987c96f65a993c38e3475bcc368 [file] [log] [blame]
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/android/scoped_hardware_buffer_handle.h"
#include "base/android/android_hardware_buffer_compat.h"
#include "base/logging.h"
#include "base/posix/unix_domain_socket.h"
namespace base {
namespace android {
ScopedHardwareBufferHandle::ScopedHardwareBufferHandle() = default;
ScopedHardwareBufferHandle::ScopedHardwareBufferHandle(
ScopedHardwareBufferHandle&& other) {
*this = std::move(other);
}
ScopedHardwareBufferHandle::~ScopedHardwareBufferHandle() {
reset();
}
// static
ScopedHardwareBufferHandle ScopedHardwareBufferHandle::Adopt(
AHardwareBuffer* buffer) {
return ScopedHardwareBufferHandle(buffer);
}
// static
ScopedHardwareBufferHandle ScopedHardwareBufferHandle::Create(
AHardwareBuffer* buffer) {
AndroidHardwareBufferCompat::GetInstance().Acquire(buffer);
return ScopedHardwareBufferHandle(buffer);
}
ScopedHardwareBufferHandle& ScopedHardwareBufferHandle::operator=(
ScopedHardwareBufferHandle&& other) {
reset();
std::swap(buffer_, other.buffer_);
return *this;
}
bool ScopedHardwareBufferHandle::is_valid() const {
return buffer_ != nullptr;
}
AHardwareBuffer* ScopedHardwareBufferHandle::get() const {
return buffer_;
}
void ScopedHardwareBufferHandle::reset() {
if (buffer_) {
AndroidHardwareBufferCompat::GetInstance().Release(buffer_);
buffer_ = nullptr;
}
}
AHardwareBuffer* ScopedHardwareBufferHandle::Take() {
AHardwareBuffer* buffer = nullptr;
std::swap(buffer, buffer_);
return buffer;
}
ScopedHardwareBufferHandle ScopedHardwareBufferHandle::Clone() const {
DCHECK(buffer_);
AndroidHardwareBufferCompat::GetInstance().Acquire(buffer_);
return ScopedHardwareBufferHandle(buffer_);
}
ScopedFD ScopedHardwareBufferHandle::SerializeAsFileDescriptor() const {
DCHECK(is_valid());
ScopedFD reader, writer;
if (!CreateSocketPair(&reader, &writer)) {
PLOG(ERROR) << "socketpair";
return ScopedFD();
}
// NOTE: SendHandleToUnixSocket does NOT acquire or retain a reference to the
// buffer object. The caller is therefore responsible for ensuring that the
// buffer remains alive through the lifetime of this file descriptor.
int result =
AndroidHardwareBufferCompat::GetInstance().SendHandleToUnixSocket(
buffer_, writer.get());
if (result < 0) {
PLOG(ERROR) << "send";
return ScopedFD();
}
return reader;
}
// static
ScopedHardwareBufferHandle
ScopedHardwareBufferHandle::DeserializeFromFileDescriptor(ScopedFD fd) {
DCHECK(fd.is_valid());
DCHECK(AndroidHardwareBufferCompat::IsSupportAvailable());
AHardwareBuffer* buffer = nullptr;
// NOTE: Upon success, RecvHandleFromUnixSocket acquires a new reference to
// the AHardwareBuffer.
int result =
AndroidHardwareBufferCompat::GetInstance().RecvHandleFromUnixSocket(
fd.get(), &buffer);
if (result < 0) {
PLOG(ERROR) << "recv";
return ScopedHardwareBufferHandle();
}
return ScopedHardwareBufferHandle(buffer);
}
ScopedHardwareBufferHandle::ScopedHardwareBufferHandle(AHardwareBuffer* buffer)
: buffer_(buffer) {
DCHECK(AndroidHardwareBufferCompat::IsSupportAvailable());
}
} // namespace android
} // namespace base