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// Copyright 2015 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 "components/mus/common/mojo_gpu_memory_buffer.h"
#include <stdint.h>
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/memory/shared_memory.h"
#include "base/numerics/safe_conversions.h"
#include "build/build_config.h"
#include "mojo/public/cpp/system/buffer.h"
#include "mojo/public/cpp/system/platform_handle.h"
#include "ui/gfx/buffer_format_util.h"
namespace mus {
MojoGpuMemoryBufferImpl::MojoGpuMemoryBufferImpl(
const gfx::Size& size,
gfx::BufferFormat format,
std::unique_ptr<base::SharedMemory> shared_memory)
: GpuMemoryBufferImpl(gfx::GenericSharedMemoryId(0), size, format),
shared_memory_(std::move(shared_memory)) {}
// TODO(rjkroege): Support running a destructor callback as necessary.
MojoGpuMemoryBufferImpl::~MojoGpuMemoryBufferImpl() {}
std::unique_ptr<gfx::GpuMemoryBuffer> MojoGpuMemoryBufferImpl::Create(
const gfx::Size& size,
gfx::BufferFormat format,
gfx::BufferUsage usage) {
size_t bytes = gfx::BufferSizeForBufferFormat(size, format);
mojo::ScopedSharedBufferHandle handle =
mojo::SharedBufferHandle::Create(bytes);
if (!handle.is_valid())
return nullptr;
base::SharedMemoryHandle platform_handle;
size_t shared_memory_size;
bool readonly;
MojoResult result = mojo::UnwrapSharedMemoryHandle(
std::move(handle), &platform_handle, &shared_memory_size, &readonly);
if (result != MOJO_RESULT_OK)
return nullptr;
DCHECK_EQ(shared_memory_size, bytes);
auto shared_memory =
base::MakeUnique<base::SharedMemory>(platform_handle, readonly);
return base::WrapUnique<gfx::GpuMemoryBuffer>(
new MojoGpuMemoryBufferImpl(size, format, std::move(shared_memory)));
}
MojoGpuMemoryBufferImpl* MojoGpuMemoryBufferImpl::FromClientBuffer(
ClientBuffer buffer) {
return reinterpret_cast<MojoGpuMemoryBufferImpl*>(buffer);
}
const unsigned char* MojoGpuMemoryBufferImpl::GetMemory() const {
return static_cast<const unsigned char*>(shared_memory_->memory());
}
bool MojoGpuMemoryBufferImpl::Map() {
DCHECK(!mapped_);
if (!shared_memory_->Map(gfx::BufferSizeForBufferFormat(size_, format_)))
return false;
mapped_ = true;
return true;
}
void* MojoGpuMemoryBufferImpl::memory(size_t plane) {
DCHECK(mapped_);
DCHECK_LT(plane, gfx::NumberOfPlanesForBufferFormat(format_));
return reinterpret_cast<uint8_t*>(shared_memory_->memory()) +
gfx::BufferOffsetForBufferFormat(size_, format_, plane);
}
void MojoGpuMemoryBufferImpl::Unmap() {
DCHECK(mapped_);
shared_memory_->Unmap();
mapped_ = false;
}
int MojoGpuMemoryBufferImpl::stride(size_t plane) const {
DCHECK_LT(plane, gfx::NumberOfPlanesForBufferFormat(format_));
return base::checked_cast<int>(gfx::RowSizeForBufferFormat(
size_.width(), format_, static_cast<int>(plane)));
}
gfx::GpuMemoryBufferHandle MojoGpuMemoryBufferImpl::GetHandle() const {
gfx::GpuMemoryBufferHandle handle;
handle.type = gfx::SHARED_MEMORY_BUFFER;
handle.handle = shared_memory_->handle();
handle.offset = 0;
handle.stride = static_cast<int32_t>(
gfx::RowSizeForBufferFormat(size_.width(), format_, 0));
return handle;
}
gfx::GpuMemoryBufferType MojoGpuMemoryBufferImpl::GetBufferType() const {
return gfx::SHARED_MEMORY_BUFFER;
}
} // namespace mus
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