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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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