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/*
* Copyright (C) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CanvasByteArray_h
#define CanvasByteArray_h
#include "CanvasArray.h"
#include <limits>
#include <wtf/MathExtras.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
namespace WebCore {
class CanvasArrayBuffer;
class CanvasByteArray : public CanvasArray {
public:
virtual bool isByteArray() const { return true; }
static PassRefPtr<CanvasByteArray> create(unsigned length);
static PassRefPtr<CanvasByteArray> create(signed char* array, unsigned length);
static PassRefPtr<CanvasByteArray> create(PassRefPtr<CanvasArrayBuffer> buffer, int offset, unsigned length);
char* data() { return static_cast<char*>(baseAddress()); }
virtual unsigned length() const;
virtual unsigned sizeInBytes() const;
void set(unsigned index, double value)
{
if (index >= m_size)
return;
if (isnan(value)) // Clamp NaN to 0
value = 0;
if (value < std::numeric_limits<signed char>::min())
value = std::numeric_limits<signed char>::min();
else if (value > std::numeric_limits<signed char>::max())
value = std::numeric_limits<signed char>::max();
signed char* storage = static_cast<signed char*>(m_baseAddress);
storage[index] = static_cast<signed char>(value);
}
bool get(unsigned index, signed char& result) const
{
if (index >= m_size)
return false;
signed char* storage = static_cast<signed char*>(m_baseAddress);
result = storage[index];
return true;
}
signed char item(unsigned index) const
{
ASSERT(index < m_size);
signed char* storage = static_cast<signed char*>(m_baseAddress);
return storage[index];
}
private:
CanvasByteArray(PassRefPtr<CanvasArrayBuffer> buffer,
int offset,
unsigned length);
unsigned m_size;
};
} // namespace WebCore
#endif // CanvasByteArray_h
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