1// Copyright 2014 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#include "gpu/command_buffer/common/buffer.h" 6 7#include "base/logging.h" 8 9#include "base/numerics/safe_math.h" 10 11namespace gpu { 12SharedMemoryBufferBacking::SharedMemoryBufferBacking( 13 scoped_ptr<base::SharedMemory> shared_memory, 14 size_t size) 15 : shared_memory_(shared_memory.Pass()), size_(size) {} 16 17SharedMemoryBufferBacking::~SharedMemoryBufferBacking() {} 18 19void* SharedMemoryBufferBacking::GetMemory() const { 20 return shared_memory_->memory(); 21} 22 23size_t SharedMemoryBufferBacking::GetSize() const { return size_; } 24 25Buffer::Buffer(scoped_ptr<BufferBacking> backing) 26 : backing_(backing.Pass()), 27 memory_(backing_->GetMemory()), 28 size_(backing_->GetSize()) { 29 DCHECK(memory_) << "The memory must be mapped to create a Buffer"; 30} 31 32Buffer::~Buffer() {} 33 34void* Buffer::GetDataAddress(uint32 data_offset, uint32 data_size) const { 35 base::CheckedNumeric<uint32> end = data_offset; 36 end += data_size; 37 if (!end.IsValid() || end.ValueOrDie() > static_cast<uint32>(size_)) 38 return NULL; 39 return static_cast<uint8*>(memory_) + data_offset; 40} 41 42} // namespace gpu 43