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// 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 {
Buffer::Buffer(scoped_ptr<base::SharedMemory> shared_memory, size_t size)
: shared_memory_(shared_memory.Pass()),
memory_(shared_memory_->memory()),
size_(size) {
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
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