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Side by Side Diff: Source/WTF/wtf/Uint8ClampedArray.h

Issue 14238015: Move Source/WTF/wtf to Source/wtf (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: Created 7 years, 8 months ago
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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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