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