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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gpu/command_buffer/client/internal/mappable_buffer_ahb.h"
#include <android/hardware_buffer.h>
#include <optional>
#include "base/check.h"
#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/ptr_util.h"
#include "base/synchronization/waitable_event.h"
#include "base/threading/thread_restrictions.h"
#include "components/viz/common/resources/shared_image_format_utils.h"
#include "third_party/abseil-cpp/absl/cleanup/cleanup.h"
#include "ui/gfx/buffer_format_util.h"
namespace gpu {
MappableBufferAHB::~MappableBufferAHB() {
base::AutoLock auto_lock(map_lock_);
CHECK(!async_mapping_in_progress_);
CHECK_EQ(map_count_, 0u);
}
// static
std::unique_ptr<MappableBufferAHB> MappableBufferAHB::CreateFromHandle(
gfx::GpuMemoryBufferHandle handle,
const gfx::Size& size,
viz::SharedImageFormat format,
CopyNativeBufferToShMemCallback copy_native_buffer_to_shmem_callback,
scoped_refptr<base::UnsafeSharedMemoryPool> pool) {
DCHECK_EQ(handle.type, gfx::ANDROID_HARDWARE_BUFFER);
return base::WrapUnique(new MappableBufferAHB(
size, format, std::move(handle),
std::move(copy_native_buffer_to_shmem_callback), std::move(pool)));
}
// static
base::OnceClosure MappableBufferAHB::AllocateForTesting(
const gfx::Size& size,
viz::SharedImageFormat format,
gfx::BufferUsage usage,
gfx::GpuMemoryBufferHandle* handle) {
DCHECK(format == viz::MultiPlaneFormat::kNV12);
AHardwareBuffer* buffer = nullptr;
AHardwareBuffer_Desc desc = {
.width = static_cast<uint32_t>(size.width()),
.height = static_cast<uint32_t>(size.height()),
.layers = 1,
.format = AHARDWAREBUFFER_FORMAT_Y8Cb8Cr8_420,
.usage = AHARDWAREBUFFER_USAGE_CPU_READ_OFTEN,
};
AHardwareBuffer_allocate(&desc, &buffer);
*handle = gfx::GpuMemoryBufferHandle(
base::android::ScopedHardwareBufferHandle::Adopt(buffer));
return base::DoNothing();
}
bool MappableBufferAHB::Map() {
base::WaitableEvent event;
bool result = false;
base::ScopedAllowBaseSyncPrimitivesOutsideBlockingScope allow_wait;
MapAsync(base::BindOnce(
[](base::WaitableEvent* event, bool* result_ptr, bool map_result) {
*result_ptr = map_result;
event->Signal();
},
&event, &result));
event.Wait();
return result;
}
void MappableBufferAHB::MapAsync(base::OnceCallback<void(bool)> result_cb) {
std::optional<bool> early_result;
absl::Cleanup run_callback_if_needed = [&] {
if (result_cb) {
CHECK(early_result.has_value());
std::move(result_cb).Run(early_result.value());
}
};
base::AutoLock auto_lock(map_lock_);
if (map_count_ > 0) {
++map_count_;
early_result = true;
return;
}
CHECK(copy_native_buffer_to_shmem_callback_);
CHECK(shared_memory_pool_);
size_t buffer_size =
viz::SharedMemorySizeForSharedImageFormat(format_, size_).value();
if (!shared_memory_handle_) {
shared_memory_handle_ =
shared_memory_pool_->MaybeAllocateBuffer(buffer_size);
if (!shared_memory_handle_) {
early_result = false;
return;
}
}
map_callbacks_.push_back(std::move(result_cb));
if (async_mapping_in_progress_) {
return;
}
async_mapping_in_progress_ = true;
// Need to perform mapping in GPU process
// Unretained is safe because of GMB isn't destroyed before the callback
// executes. This is CHECKed in the destructor.
copy_native_buffer_to_shmem_callback_.Run(
CloneHandle(), shared_memory_handle_->GetRegion().Duplicate(),
base::BindOnce(&MappableBufferAHB::CheckAsyncMapResult,
base::Unretained(this)));
}
void MappableBufferAHB::CheckAsyncMapResult(bool result) {
std::vector<base::OnceCallback<void(bool)>> map_callbacks;
{
// Must not hold the lock during the callbacks calls.
base::AutoLock auto_lock(map_lock_);
CHECK_EQ(map_count_, 0u);
CHECK(async_mapping_in_progress_);
if (result) {
map_count_ += map_callbacks_.size();
}
async_mapping_in_progress_ = false;
swap(map_callbacks_, map_callbacks);
}
for (auto& cb : map_callbacks) {
std::move(cb).Run(result);
}
}
bool MappableBufferAHB::AsyncMappingIsNonBlocking() const {
return true;
}
void* MappableBufferAHB::memory(size_t plane) {
AssertMapped();
if (static_cast<int>(plane) > format_.NumberOfPlanes() ||
!shared_memory_handle_) {
return nullptr;
}
base::span<uint8_t> mapping =
shared_memory_handle_->GetMapping().GetMemoryAsSpan<uint8_t>();
size_t offset =
viz::SharedMemoryOffsetForSharedImageFormat(format_, plane, size_);
return mapping.subspan(offset).data();
}
void MappableBufferAHB::Unmap() {
base::AutoLock auto_lock(map_lock_);
DCHECK_GT(map_count_, 0u);
CHECK(!async_mapping_in_progress_);
if (--map_count_) {
return;
}
if (shared_memory_handle_) {
shared_memory_handle_.reset();
}
}
int MappableBufferAHB::stride(size_t plane) const {
size_t stride = viz::SharedMemoryRowSizeForSharedImageFormat(format_, plane,
size_.width())
.value();
return static_cast<int>(stride);
}
gfx::GpuMemoryBufferType MappableBufferAHB::GetType() const {
return gfx::ANDROID_HARDWARE_BUFFER;
}
gfx::GpuMemoryBufferHandle MappableBufferAHB::CloneHandle() const {
return handle_.Clone();
}
void MappableBufferAHB::AssertMapped() {
#if DCHECK_IS_ON()
base::AutoLock auto_lock(map_lock_);
DCHECK_GT(map_count_, 0u);
#endif
}
MappableBufferAHB::MappableBufferAHB(
const gfx::Size& size,
viz::SharedImageFormat format,
gfx::GpuMemoryBufferHandle handle,
CopyNativeBufferToShMemCallback copy_native_buffer_to_shmem_callback,
scoped_refptr<base::UnsafeSharedMemoryPool> pool)
: size_(size),
format_(format),
handle_(std::move(handle)),
copy_native_buffer_to_shmem_callback_(
std::move(copy_native_buffer_to_shmem_callback)),
shared_memory_pool_(std::move(pool)) {}
} // namespace gpu
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