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using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace FreeImageAPI
{
/// <summary>
/// Provides methods for working with generic bitmap scanlines.
/// </summary>
/// <typeparam name="T">Type of the bitmaps' scanlines.</typeparam>
public sealed class Scanline<T> : MemoryArray<T> where T : struct
{
/// <summary>
/// Initializes a new instance based on the specified FreeImage bitmap.
/// </summary>
/// <param name="dib">Handle to a FreeImage bitmap.</param>
public Scanline(FIBITMAP dib)
: this(dib, 0)
{
}
/// <summary>
/// Initializes a new instance based on the specified FreeImage bitmap.
/// </summary>
/// <param name="dib">Handle to a FreeImage bitmap.</param>
/// <param name="scanline">Index of the zero based scanline.</param>
public Scanline(FIBITMAP dib, int scanline)
: this(dib, scanline, (int)(typeof(T) == typeof(FI1BIT) ?
FreeImage.GetBPP(dib) * FreeImage.GetWidth(dib) :
typeof(T) == typeof(FI4BIT) ?
FreeImage.GetBPP(dib) * FreeImage.GetWidth(dib) / 4 :
(FreeImage.GetBPP(dib) * FreeImage.GetWidth(dib)) / (Marshal.SizeOf(typeof(T)) * 8)))
{
}
internal Scanline(FIBITMAP dib, int scanline, int length)
: base(FreeImage.GetScanLine(dib, scanline), length)
{
if (dib.IsNull)
{
throw new ArgumentNullException("dib");
}
if ((scanline < 0) || (scanline >= FreeImage.GetHeight(dib)))
{
throw new ArgumentOutOfRangeException("scanline");
}
}
}
}
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