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// Copyright (C) 2008-2012 NVIDIA Corporation.
// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#ifndef QSSGDATAREF_H
#define QSSGDATAREF_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtQuick3DUtils/private/qtquick3dutilsglobal_p.h>
#include <QtCore/qlist.h>
#include <QtCore/qbytearray.h>
QT_BEGIN_NAMESPACE
template<typename T>
struct QSSGDataView
{
const T *mData;
qsizetype mSize;
explicit QSSGDataView(const QList<T> &data) : mData(data.constData()), mSize(data.size()) { Q_ASSERT(mSize >= 0); }
template <qsizetype N>
explicit QSSGDataView(const QVarLengthArray<T, N> &data) : mData(data.constData()), mSize(data.size()) { Q_ASSERT(mSize >= 0); }
QSSGDataView(const T *inData, qsizetype inSize) : mData(inData), mSize(inSize) { Q_ASSERT(mSize >= 0); }
constexpr QSSGDataView() : mData(nullptr), mSize(0) {}
qsizetype size() const { return mSize; }
const T *begin() const { return mData; }
const T *end() const { return mData + mSize; }
const T& first() const { Q_ASSERT(!isEmpty()); return *begin(); }
const T& last() const { Q_ASSERT(!isEmpty()); return *(end()-1); }
const T &operator[](int index) const
{
Q_ASSERT(index > -1);
Q_ASSERT(index < mSize);
return mData[index];
}
bool isEmpty() const { return (mSize == 0); }
void clear()
{
mData = nullptr;
mSize = 0;
}
operator const void *() { return reinterpret_cast<const void *>(mData); }
};
template<>
struct QSSGDataView<quint8>
{
const quint8 *mData;
qsizetype mSize;
explicit QSSGDataView(const QByteArray &data)
: mData(reinterpret_cast<const quint8 *>(data.constBegin())), mSize(data.size())
{ Q_ASSERT(mSize >= 0); }
template<typename T>
explicit QSSGDataView(const QList<T> &data)
: mData(reinterpret_cast<const quint8 *>(data.constData())), mSize(data.size()*sizeof(T))
{ Q_ASSERT(mSize >= 0); }
QSSGDataView(const quint8 *inData, qsizetype inSize) : mData(inData), mSize(inSize) { Q_ASSERT(mSize >= 0); }
template<typename T>
QSSGDataView(const T *inData, qsizetype inSize)
: mData(reinterpret_cast<const quint8 *>(inData)), mSize(inSize*sizeof(T))
{ Q_ASSERT(mSize >= 0); }
constexpr QSSGDataView() : mData(nullptr), mSize(0) {}
qsizetype size() const { return mSize; }
bool isEmpty() const { return (mSize == 0); }
const quint8 *begin() const { return mData; }
const quint8 *end() const { return mData + mSize; }
const quint8 &operator[](int index) const
{
Q_ASSERT(index > -1);
Q_ASSERT(index < mSize);
return mData[index];
}
void clear()
{
mData = nullptr;
mSize = 0;
}
operator const void *() { return reinterpret_cast<const void *>(mData); }
};
using QSSGByteView = QSSGDataView<quint8>;
template<typename T>
inline QSSGDataView<T> toDataView(const T &type)
{
return QSSGDataView<T>(&type, 1);
}
template<typename T>
inline QSSGDataView<T> toDataView(const QList<T> &type)
{
return QSSGDataView<T>(type);
}
template<typename T>
inline QSSGByteView toByteView(const T &type)
{
return QSSGByteView(&type, 1);
}
template<typename T>
inline QSSGByteView toByteView(const QList<T> &type)
{
return QSSGByteView(type);
}
template<>
inline QSSGByteView toByteView(const QByteArray &type)
{
return QSSGByteView(type);
}
inline QSSGByteView toByteView(const char *str)
{
return QSSGByteView(str, qstrlen(str));
}
template<typename T>
inline QSSGDataView<T> toDataView(const T *type, qsizetype count)
{
return QSSGDataView<T>(type, count);
}
template<typename T>
inline QSSGByteView toByteView(const T *type, qsizetype count)
{
return QSSGByteView(type, count);
}
template<typename T>
struct QSSGDataRef
{
T *mData;
qsizetype mSize;
QSSGDataRef(T *inData, qsizetype inSize) : mData(inData), mSize(inSize) { Q_ASSERT(inSize >= 0); }
QSSGDataRef() : mData(nullptr), mSize(0) {}
qsizetype size() const { return mSize; }
T *begin() { return mData; }
T *end() { return mData + mSize; }
T *begin() const { return mData; }
T *end() const { return mData + mSize; }
T& first() { Q_ASSERT(!isEmpty()); return *begin(); }
T& last() { Q_ASSERT(!isEmpty()); return *(end()-1); }
const T &first() const { Q_ASSERT(!isEmpty()); return *begin(); }
const T &last() const { Q_ASSERT(!isEmpty()); return *(end()-1); }
bool isEmpty() const { return (mSize == 0); }
T &operator[](qsizetype index)
{
Q_ASSERT(index >= 0);
Q_ASSERT(index < mSize);
return mData[index];
}
const T &operator[](qsizetype index) const
{
Q_ASSERT(index >= 0);
Q_ASSERT(index < mSize);
return mData[index];
}
void clear()
{
mData = nullptr;
mSize = 0;
}
operator QSSGDataView<T>() const { return QSSGDataView<T>(mData, mSize); }
operator void *() { return reinterpret_cast<void *>(mData); }
};
using QSSGByteRef = QSSGDataRef<quint8>;
template<typename T>
inline QSSGDataRef<T> toDataRef(T &type)
{
return QSSGDataRef<T>(&type, 1);
}
template<typename T>
inline QSSGByteRef toByteRef(T &type)
{
return QSSGByteRef(reinterpret_cast<quint8 *>(&type), sizeof(T));
}
template<typename T>
inline QSSGDataRef<T> toDataRef(T *type, qsizetype count)
{
return QSSGDataRef<T>(type, count);
}
template<typename T>
inline QSSGByteRef toByteRef(T *type, qsizetype count)
{
return QSSGByteRef(reinterpret_cast<quint8 *>(type), sizeof(T) * count);
}
QT_END_NAMESPACE
#endif // QSSGDATAREF_H
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