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 11 namespace gpu { SharedMemoryBufferBacking(scoped_ptr<base::SharedMemory> shared_memory,size_t size)12SharedMemoryBufferBacking::SharedMemoryBufferBacking( 13 scoped_ptr<base::SharedMemory> shared_memory, 14 size_t size) 15 : shared_memory_(shared_memory.Pass()), size_(size) {} 16 ~SharedMemoryBufferBacking()17SharedMemoryBufferBacking::~SharedMemoryBufferBacking() {} 18 GetMemory() const19void* SharedMemoryBufferBacking::GetMemory() const { 20 return shared_memory_->memory(); 21 } 22 GetSize() const23size_t SharedMemoryBufferBacking::GetSize() const { return size_; } 24 Buffer(scoped_ptr<BufferBacking> backing)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 ~Buffer()32Buffer::~Buffer() {} 33 GetDataAddress(uint32 data_offset,uint32 data_size) const34void* 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