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/Uint8Array.h"
32 #include "wtf/MathExtras.h"
33
34 namespace WTF {
35
36 class Uint8ClampedArray : public Uint8Array {
37 public:
38 static inline PassRefPtr<Uint8ClampedArray> create(unsigned length);
39 static inline PassRefPtr<Uint8ClampedArray> create(const unsigned char* array, unsigned length);
40 static inline PassRefPtr<Uint8ClampedArray> create(PassRefPtr<ArrayBuffer>, unsigned byteOffset, unsigned length);
41
42 // Should only be used when it is known the entire array will be filled. Do
43 // not return these results directly to JavaScript without filling first.
44 static inline PassRefPtr<Uint8ClampedArray> createUninitialized(unsigned length);
45
46 // It's only needed to potentially call this method if the array
47 // was created uninitialized -- the default initialization paths
48 // zero the allocated memory.
49 inline void zeroFill();
50
51 using TypedArrayBase<unsigned char>::set;
52 inline void set(unsigned index, double value);
53
54 inline PassRefPtr<Uint8ClampedArray> subarray(int start) const;
55 inline PassRefPtr<Uint8ClampedArray> subarray(int start, int end) const;
56
getType()57 virtual ViewType getType() const
58 {
59 return TypeUint8Clamped;
60 }
61
62 private:
63 inline Uint8ClampedArray(PassRefPtr<ArrayBuffer>,
64 unsigned byteOffset,
65 unsigned length);
66 // Make constructor visible to superclass.
67 friend class TypedArrayBase<unsigned char>;
68 };
69
create(unsigned length)70 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::create(unsigned length)
71 {
72 return TypedArrayBase<unsigned char>::create<Uint8ClampedArray>(length);
73 }
74
create(const unsigned char * array,unsigned length)75 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::create(const unsigned char* array, unsigned length)
76 {
77 return TypedArrayBase<unsigned char>::create<Uint8ClampedArray>(array, length);
78 }
79
create(PassRefPtr<ArrayBuffer> buffer,unsigned byteOffset,unsigned length)80 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::create(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length)
81 {
82 return TypedArrayBase<unsigned char>::create<Uint8ClampedArray>(buffer, byteOffset, length);
83 }
84
createUninitialized(unsigned length)85 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::createUninitialized(unsigned length)
86 {
87 return TypedArrayBase<unsigned char>::createUninitialized<Uint8ClampedArray>(length);
88 }
89
zeroFill()90 void Uint8ClampedArray::zeroFill()
91 {
92 zeroRange(0, length());
93 }
94
set(unsigned index,double value)95 void Uint8ClampedArray::set(unsigned index, double value)
96 {
97 if (index >= m_length)
98 return;
99 if (std::isnan(value) || value < 0)
100 value = 0;
101 else if (value > 255)
102 value = 255;
103 data()[index] = static_cast<unsigned char>(lrint(value));
104 }
105
Uint8ClampedArray(PassRefPtr<ArrayBuffer> buffer,unsigned byteOffset,unsigned length)106 Uint8ClampedArray::Uint8ClampedArray(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length)
107 : Uint8Array(buffer, byteOffset, length)
108 {
109 }
110
subarray(int start)111 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::subarray(int start) const
112 {
113 return subarray(start, length());
114 }
115
subarray(int start,int end)116 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::subarray(int start, int end) const
117 {
118 return subarrayImpl<Uint8ClampedArray>(start, end);
119 }
120
121 } // namespace WTF
122
123 using WTF::Uint8ClampedArray;
124
125 #endif // Uint8ClampedArray_h
126