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3 * Copyright (c) 2010, Google Inc. All rights reserved.
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27 #ifndef TypedArrayBase_h
28 #define TypedArrayBase_h
30 #include <wtf/ArrayBuffer.h>
31 #include <wtf/ArrayBufferView.h>
36 class TypedArrayBase : public ArrayBufferView {
38 T* data() const { return static_cast<T*>(baseAddress()); }
40 bool set(TypedArrayBase<T>* array, unsigned offset)
42 return setImpl(array, offset * sizeof(T));
45 bool setRange(const T* data, size_t dataLength, unsigned offset)
47 return setRangeImpl(reinterpret_cast<const char*>(data), dataLength * sizeof(T), offset * sizeof(T));
50 bool zeroRange(unsigned offset, size_t length)
52 return zeroRangeImpl(offset * sizeof(T), length * sizeof(T));
55 // Overridden from ArrayBufferView. This must be public because of
56 // rules about inheritance of members in template classes, and
57 // because it is accessed via pointers to subclasses.
58 unsigned length() const
63 virtual unsigned byteLength() const
65 return m_length * sizeof(T);
68 // Invoked by the indexed getter. Does not perform range checks; caller
69 // is responsible for doing so and returning undefined as necessary.
70 T item(unsigned index) const
72 ASSERT(index < TypedArrayBase<T>::m_length);
73 return TypedArrayBase<T>::data()[index];
77 TypedArrayBase(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length)
78 : ArrayBufferView(buffer, byteOffset)
83 template <class Subclass>
84 static PassRefPtr<Subclass> create(unsigned length)
86 RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(length, sizeof(T));
89 return create<Subclass>(buffer, 0, length);
92 template <class Subclass>
93 static PassRefPtr<Subclass> create(const T* array, unsigned length)
95 RefPtr<Subclass> a = create<Subclass>(length);
97 for (unsigned i = 0; i < length; ++i)
102 template <class Subclass>
103 static PassRefPtr<Subclass> create(PassRefPtr<ArrayBuffer> buffer,
107 RefPtr<ArrayBuffer> buf(buffer);
108 if (!verifySubRange<T>(buf, byteOffset, length))
111 return adoptRef(new Subclass(buf, byteOffset, length));
114 template <class Subclass>
115 static PassRefPtr<Subclass> createUninitialized(unsigned length)
117 RefPtr<ArrayBuffer> buffer = ArrayBuffer::createUninitialized(length, sizeof(T));
120 return create<Subclass>(buffer, 0, length);
123 template <class Subclass>
124 PassRefPtr<Subclass> subarrayImpl(int start, int end) const
126 unsigned offset, length;
127 calculateOffsetAndLength(start, end, m_length, &offset, &length);
128 clampOffsetAndNumElements<T>(buffer(), m_byteOffset, &offset, &length);
129 return create<Subclass>(buffer(), offset, length);
132 virtual void neuter()
134 ArrayBufferView::neuter();
138 // We do not want to have to access this via a virtual function in subclasses,
139 // which is why it is protected rather than private.
145 using WTF::TypedArrayBase;
147 #endif // TypedArrayBase_h