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| 1 /* | |
| 2 * Copyright (C) 2009 Apple Inc. All rights reserved. | |
| 3 * Copyright (C) 2009 Google Inc. All rights reserved. | |
| 4 * Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). | |
| 5 * | |
| 6 * Redistribution and use in source and binary forms, with or without | |
| 7 * modification, are permitted provided that the following conditions | |
| 8 * are met: | |
| 9 * 1. Redistributions of source code must retain the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer. | |
| 11 * 2. Redistributions in binary form must reproduce the above copyright | |
| 12 * notice, this list of conditions and the following disclaimer in the | |
| 13 * documentation and/or other materials provided with the distribution. | |
| 14 * | |
| 15 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY | |
| 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
| 19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 #ifndef Uint8ClampedArray_h | |
| 29 #define Uint8ClampedArray_h | |
| 30 | |
| 31 #include <wtf/Platform.h> | |
| 32 | |
| 33 #include <wtf/Uint8Array.h> | |
| 34 #include <wtf/MathExtras.h> | |
| 35 | |
| 36 namespace WTF { | |
| 37 | |
| 38 class Uint8ClampedArray : public Uint8Array { | |
| 39 public: | |
| 40 static inline PassRefPtr<Uint8ClampedArray> create(unsigned length); | |
| 41 static inline PassRefPtr<Uint8ClampedArray> create(const unsigned char* arra
y, unsigned length); | |
| 42 static inline PassRefPtr<Uint8ClampedArray> create(PassRefPtr<ArrayBuffer>,
unsigned byteOffset, unsigned length); | |
| 43 | |
| 44 // Should only be used when it is known the entire array will be filled. Do | |
| 45 // not return these results directly to JavaScript without filling first. | |
| 46 static inline PassRefPtr<Uint8ClampedArray> createUninitialized(unsigned len
gth); | |
| 47 | |
| 48 // It's only needed to potentially call this method if the array | |
| 49 // was created uninitialized -- the default initialization paths | |
| 50 // zero the allocated memory. | |
| 51 inline void zeroFill(); | |
| 52 | |
| 53 using TypedArrayBase<unsigned char>::set; | |
| 54 inline void set(unsigned index, double value); | |
| 55 | |
| 56 inline PassRefPtr<Uint8ClampedArray> subarray(int start) const; | |
| 57 inline PassRefPtr<Uint8ClampedArray> subarray(int start, int end) const; | |
| 58 | |
| 59 virtual ViewType getType() const | |
| 60 { | |
| 61 return TypeUint8Clamped; | |
| 62 } | |
| 63 | |
| 64 private: | |
| 65 inline Uint8ClampedArray(PassRefPtr<ArrayBuffer>, | |
| 66 unsigned byteOffset, | |
| 67 unsigned length); | |
| 68 // Make constructor visible to superclass. | |
| 69 friend class TypedArrayBase<unsigned char>; | |
| 70 }; | |
| 71 | |
| 72 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::create(unsigned length) | |
| 73 { | |
| 74 return TypedArrayBase<unsigned char>::create<Uint8ClampedArray>(length); | |
| 75 } | |
| 76 | |
| 77 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::create(const unsigned char* arr
ay, unsigned length) | |
| 78 { | |
| 79 return TypedArrayBase<unsigned char>::create<Uint8ClampedArray>(array, lengt
h); | |
| 80 } | |
| 81 | |
| 82 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::create(PassRefPtr<ArrayBuffer>
buffer, unsigned byteOffset, unsigned length) | |
| 83 { | |
| 84 return TypedArrayBase<unsigned char>::create<Uint8ClampedArray>(buffer, byte
Offset, length); | |
| 85 } | |
| 86 | |
| 87 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::createUninitialized(unsigned le
ngth) | |
| 88 { | |
| 89 return TypedArrayBase<unsigned char>::createUninitialized<Uint8ClampedArray>
(length); | |
| 90 } | |
| 91 | |
| 92 void Uint8ClampedArray::zeroFill() | |
| 93 { | |
| 94 zeroRange(0, length()); | |
| 95 } | |
| 96 | |
| 97 void Uint8ClampedArray::set(unsigned index, double value) | |
| 98 { | |
| 99 if (index >= m_length) | |
| 100 return; | |
| 101 if (std::isnan(value) || value < 0) | |
| 102 value = 0; | |
| 103 else if (value > 255) | |
| 104 value = 255; | |
| 105 data()[index] = static_cast<unsigned char>(lrint(value)); | |
| 106 } | |
| 107 | |
| 108 Uint8ClampedArray::Uint8ClampedArray(PassRefPtr<ArrayBuffer> buffer, unsigned by
teOffset, unsigned length) | |
| 109 : Uint8Array(buffer, byteOffset, length) | |
| 110 { | |
| 111 } | |
| 112 | |
| 113 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::subarray(int start) const | |
| 114 { | |
| 115 return subarray(start, length()); | |
| 116 } | |
| 117 | |
| 118 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::subarray(int start, int end) co
nst | |
| 119 { | |
| 120 return subarrayImpl<Uint8ClampedArray>(start, end); | |
| 121 } | |
| 122 | |
| 123 } // namespace WTF | |
| 124 | |
| 125 using WTF::Uint8ClampedArray; | |
| 126 | |
| 127 #endif // Uint8ClampedArray_h | |
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