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 37 namespace WebCore { 38 39 template <typename T> 40 class 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
