1/*
2 * Copyright (C) 2009 Apple Inc. All rights reserved.
3 * Copyright (C) 2009 Google Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef WebGLUnsignedByteArray_h
28#define WebGLUnsignedByteArray_h
29
30#include "WebGLArray.h"
31#include <limits>
32#include <wtf/MathExtras.h>
33#include <wtf/PassRefPtr.h>
34#include <wtf/RefCounted.h>
35
36namespace WebCore {
37
38class WebGLUnsignedByteArray : public WebGLArray {
39  public:
40    virtual bool isUnsignedByteArray() const { return true; }
41
42    static PassRefPtr<WebGLUnsignedByteArray> create(unsigned length);
43    static PassRefPtr<WebGLUnsignedByteArray> create(unsigned char* array, unsigned length);
44    static PassRefPtr<WebGLUnsignedByteArray> create(PassRefPtr<WebGLArrayBuffer> buffer, int byteOffset, unsigned length);
45
46    unsigned char* data() { return static_cast<unsigned char*>(baseAddress()); }
47
48    virtual unsigned length() const;
49    virtual unsigned byteLength() const;
50    virtual PassRefPtr<WebGLArray> slice(unsigned offset, unsigned length);
51
52    void set(unsigned index, double value)
53    {
54        if (index >= m_size)
55            return;
56        if (isnan(value)) // Clamp NaN to 0
57            value = 0;
58        if (value < std::numeric_limits<unsigned char>::min())
59            value = std::numeric_limits<unsigned char>::min();
60        else if (value > std::numeric_limits<unsigned char>::max())
61            value = std::numeric_limits<unsigned char>::max();
62        unsigned char* storage = static_cast<unsigned char*>(m_baseAddress);
63        storage[index] = static_cast<unsigned char>(value);
64    }
65
66    bool get(unsigned index, unsigned char& result) const
67    {
68        if (index >= m_size)
69            return false;
70        result = item(index);
71        return true;
72    }
73
74    unsigned char get(unsigned index) const
75    {
76        return item(index);
77    }
78
79    unsigned char item(unsigned index) const
80    {
81        ASSERT(index < m_size);
82        unsigned char* storage = static_cast<unsigned char*>(m_baseAddress);
83        return storage[index];
84    }
85
86    void set(WebGLUnsignedByteArray* array, unsigned offset, ExceptionCode& ec);
87
88  private:
89    WebGLUnsignedByteArray(PassRefPtr<WebGLArrayBuffer> buffer, int byteOffset, unsigned length);
90    unsigned m_size;
91};
92
93} // namespace WebCore
94
95#endif // WebGLUnsignedByteArray_h
96