third_party/WebKit/Source/wtf/Uint8ClampedArray.h

   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 final : 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     using TypedArrayBase<unsigned char>::set;
  43     inline void set(unsigned index, double value);
  44
  45     ViewType type() const override
  46     {
  47         return TypeUint8Clamped;
  48     }
  49
  50 private:
  51     inline Uint8ClampedArray(PassRefPtr<ArrayBuffer>,
  52                              unsigned byteOffset,
  53                              unsigned length);
  54     // Make constructor visible to superclass.
  55     friend class TypedArrayBase<unsigned char>;
  56 };
  57
  58 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::create(unsigned length)
  59 {
  60     return TypedArrayBase<unsigned char>::create<Uint8ClampedArray>(length);
  61 }
  62
  63 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::create(const unsigned char* array, unsigned length)
  64 {
  65     return TypedArrayBase<unsigned char>::create<Uint8ClampedArray>(array, length);
  66 }
  67
  68 PassRefPtr<Uint8ClampedArray> Uint8ClampedArray::create(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length)
  69 {
  70     return TypedArrayBase<unsigned char>::create<Uint8ClampedArray>(buffer, byteOffset, length);
  71 }
  72
  73 void Uint8ClampedArray::set(unsigned index, double value)
  74 {
  75     if (index >= m_length)
  76         return;
  77     if (std::isnan(value) || value < 0)
  78         value = 0;
  79     else if (value > 255)
  80         value = 255;
  81     data()[index] = static_cast<unsigned char>(lrint(value));
  82 }
  83
  84 Uint8ClampedArray::Uint8ClampedArray(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length)
  85 : Uint8Array(buffer, byteOffset, length)
  86 {
  87 }
  88
  89 } // namespace WTF
  90
  91 using WTF::Uint8ClampedArray;
  92
  93 #endif // Uint8ClampedArray_h