/// <summary>
/// ����ָ��ƫ�Ʊ�������
/// </summary>
/// <param name="AddressMode">ָ��Ѱַģʽ</param>
/// <param name="OffsetPointer">ָ��ƫ�Ʊ�Ļ���ַ��������Ϊnull��
/// <para>�뱣֤���ڴ�鱻�������ɲο�<seealso cref="fixed"/>��<seealso cref="stackalloc"/>��<seealso cref="System.Runtime.InteropServices.Marshal.AllocHGlobal"/>��</para>
/// </param>
/// <param name="OffsetSize">ָ��ƫ�Ʊ�ijߴ磨Ԫ�صĸ����������������0��</param>
/// <param name="OffsetBase">ָ��ƫ�Ʊ��������Ļ���ƫ�ơ��������� [0,OffsetSize) ���䡣
/// <para>���壺f(i) = OffsetPointer[OffsetBase + i]��</para>
/// </param>
/// <param name="Stride">ָ��Ŀ�ࡣ������Ϊ0��������Ϊ������</param>
/// <param name="LimitStart">��������硣</param>
/// <param name="LimitSize">������ijߴ硣���������0��
/// <para>ע��������ķ�Χ��[LimitStart, LimitStart+LimitSize)���䣨����������ʱΪ���������㣬�Ὣ��淶��Ϊ[0.0, 1.0)���䣨ʵ������</para>
/// </param>
/// <returns>ָ��ƫ�Ʊ�������ʧ��ʱ����null��</returns>
public static unsafe IPointerOffset NewPointerOffset(WrapAddressMode AddressMode,
long* OffsetPointer, int OffsetSize, int OffsetBase, long Stride,
long LimitStart, long LimitSize)
{
return NewPointerOffset(AddressMode, OffsetPointer, OffsetSize, OffsetBase, Stride, LimitStart, LimitSize, DefaultPointer);
}
/// <summary>
/// ����ָ��ƫ�Ʊ�������
/// </summary>
/// <param name="AddressMode">ָ��Ѱַģʽ</param>
/// <param name="OffsetPointer">ָ��ƫ�Ʊ�Ļ���ַ��������Ϊnull��
/// <para>�뱣֤���ڴ�鱻�������ɲο�<seealso cref="fixed"/>��<seealso cref="stackalloc"/>��<seealso cref="System.Runtime.InteropServices.Marshal.AllocHGlobal"/>��</para>
/// </param>
/// <param name="OffsetSize">ָ��ƫ�Ʊ�ijߴ磨Ԫ�صĸ����������������0��</param>
/// <param name="OffsetBase">ָ��ƫ�Ʊ��������Ļ���ƫ�ơ��������� [0,OffsetSize) ���䡣
/// <para>���壺f(i) = OffsetPointer[OffsetBase + i]��</para>
/// </param>
/// <param name="Stride">ָ��Ŀ�ࡣ������Ϊ0��������Ϊ������</param>
/// <param name="LimitStart">��������硣</param>
/// <param name="LimitSize">������ijߴ硣���������0��
/// <para>ע��������ķ�Χ��[LimitStart, LimitStart+LimitSize)���䣨����������ʱΪ���������㣬�Ὣ��淶��Ϊ[0.0, 1.0)���䣨ʵ������</para>
/// </param>
/// <param name="DefaultPointer">Ĭ��ָ�룬������<seealso cref="WrapAddressMode.Border"/>ģʽ��Ĭ��Ϊnull��</param>
/// <returns>ָ��ƫ�Ʊ�������ʧ��ʱ����null��</returns>
public static unsafe IPointerOffset NewPointerOffset(WrapAddressMode AddressMode,
long* OffsetPointer, int OffsetSize, int OffsetBase, long Stride,
long LimitStart, long LimitSize, byte* DefaultPointer)
{
switch (AddressMode)
{
case WrapAddressMode.Clamp:
return new PointerOffsetClamp(OffsetPointer, OffsetSize, OffsetBase, Stride, LimitStart, LimitSize);
case WrapAddressMode.Border:
return new PointerOffsetBorder(OffsetPointer, OffsetSize, OffsetBase, Stride, LimitStart, LimitSize, DefaultPointer);
}
return null;
}
/// <summary>
/// ����ָ��ƫ�Ʊ�������
/// </summary>
/// <param name="AddressMode">ָ��Ѱַģʽ</param>
/// <param name="DefaultPointer">Ĭ��ָ�룬������<seealso cref="WrapAddressMode.Border"/>ģʽ��Ĭ��Ϊnull��</param>
/// <returns>ָ��ƫ�Ʊ�������ʧ��ʱ����null��</returns>
public static IPointerOffset NewPointerOffset(WrapAddressMode AddressMode, byte* DefaultPointer)
{
switch (AddressMode)
{
case WrapAddressMode.Clamp:
return new PointerOffsetClamp();
case WrapAddressMode.Border:
return new PointerOffsetBorder(DefaultPointer);
}
return null;
}
