1/*
2 * Copyright (C) 2010 Apple Inc. All rights reserved.
3 * Copyright (c) 2010, Google Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef IntegralTypedArrayBase_h
28#define IntegralTypedArrayBase_h
29
30#include "TypedArrayBase.h"
31#include <limits>
32#include <wtf/MathExtras.h>
33
34// Base class for all WebGL<T>Array types holding integral
35// (non-floating-point) values.
36
37namespace WebCore {
38
39template <typename T>
40class IntegralTypedArrayBase : public TypedArrayBase<T> {
41  public:
42    void set(unsigned index, double value)
43    {
44        if (index >= TypedArrayBase<T>::m_length)
45            return;
46        if (isnan(value)) // Clamp NaN to 0
47            value = 0;
48        // The double cast is necessary to get the correct wrapping
49        // for out-of-range values with Int32Array and Uint32Array.
50        TypedArrayBase<T>::data()[index] = static_cast<T>(static_cast<int64_t>(value));
51    }
52
53    // Invoked by the indexed getter. Does not perform range checks; caller
54    // is responsible for doing so and returning undefined as necessary.
55    T item(unsigned index) const
56    {
57        ASSERT(index < TypedArrayBase<T>::m_length);
58        return TypedArrayBase<T>::data()[index];
59    }
60
61  protected:
62    IntegralTypedArrayBase(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length)
63        : TypedArrayBase<T>(buffer, byteOffset, length)
64    {
65    }
66};
67
68} // namespace WebCore
69
70#endif // IntegralTypedArrayBase_h
71