| // Copyright 2014 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 "gpu/command_buffer/common/buffer.h" |
| |
| #include "base/logging.h" |
| |
| #include "base/numerics/safe_math.h" |
| |
| namespace gpu { |
| SharedMemoryBufferBacking::SharedMemoryBufferBacking( |
| scoped_ptr<base::SharedMemory> shared_memory, |
| size_t size) |
| : shared_memory_(shared_memory.Pass()), size_(size) {} |
| |
| SharedMemoryBufferBacking::~SharedMemoryBufferBacking() {} |
| |
| void* SharedMemoryBufferBacking::GetMemory() const { |
| return shared_memory_->memory(); |
| } |
| |
| size_t SharedMemoryBufferBacking::GetSize() const { return size_; } |
| |
| Buffer::Buffer(scoped_ptr<BufferBacking> backing) |
| : backing_(backing.Pass()), |
| memory_(backing_->GetMemory()), |
| size_(backing_->GetSize()) { |
| DCHECK(memory_) << "The memory must be mapped to create a Buffer"; |
| } |
| |
| Buffer::~Buffer() {} |
| |
| void* Buffer::GetDataAddress(uint32 data_offset, uint32 data_size) const { |
| base::CheckedNumeric<uint32> end = data_offset; |
| end += data_size; |
| if (!end.IsValid() || end.ValueOrDie() > static_cast<uint32>(size_)) |
| return NULL; |
| return static_cast<uint8*>(memory_) + data_offset; |
| } |
| |
| } // namespace gpu |