freeimagebitmap.cs

对gif

				EnsureNotDisposed();
				return FreeImage.GetScanLine(dib, (int)(FreeImage.GetHeight(dib) - 1));
			}
		}

		/// <summary>
		/// Width, in bytes, of this <see cref="FreeImageBitmap"/>.
		/// In case this <see cref="FreeImageBitmap"/> is top down <b>Stride</b> will be positive, else negative.
		/// </summary>
		public int Stride
		{
			get
			{
				return -Line;
			}
		}

		/// <summary>
		/// Gets attribute flags for the pixel data of this <see cref="FreeImageBitmap"/>.
		/// </summary>
		public unsafe int Flags
		{
			get
			{
				EnsureNotDisposed();
				int result = 0;
				byte alpha;
				int cd = ColorDepth;

				if ((cd == 32) || (FreeImage.GetTransparencyCount(dib) != 0))
				{
					result += (int)ImageFlags.HasAlpha;
				}

				if (cd == 32)
				{
					uint width = FreeImage.GetWidth(dib);
					uint height = FreeImage.GetHeight(dib);
					for (int y = 0; y < height; y++)
					{
						RGBQUAD* scanline = (RGBQUAD*)FreeImage.GetScanLine(dib, y);
						for (int x = 0; x < width; x++)
						{
							alpha = scanline[x].Color.A;
							if (alpha != byte.MinValue && alpha != byte.MaxValue)
							{
								result += (int)ImageFlags.HasTranslucent;
								y = (int)height;
								break;
							}
						}
					}
				}
				else if (FreeImage.GetTransparencyCount(dib) != 0)
				{
					byte[] transTable = FreeImage.GetTransparencyTableEx(dib);
					for (int i = 0; i < transTable.Length; i++)
					{
						if (transTable[i] != byte.MinValue && transTable[i] != byte.MaxValue)
						{
							result += (int)ImageFlags.HasTranslucent;
							break;
						}
					}
				}

				if (FreeImage.GetICCProfileEx(dib).IsCMYK)
				{
					result += (int)ImageFlags.ColorSpaceCmyk;
				}
				else
				{
					result += (int)ImageFlags.ColorSpaceRgb;
				}

				if (FreeImage.GetColorType(dib) == FREE_IMAGE_COLOR_TYPE.FIC_MINISBLACK ||
					FreeImage.GetColorType(dib) == FREE_IMAGE_COLOR_TYPE.FIC_MINISWHITE)
				{
					result += (int)ImageFlags.ColorSpaceGray;
				}

				if (originalFormat == FREE_IMAGE_FORMAT.FIF_BMP ||
					originalFormat == FREE_IMAGE_FORMAT.FIF_FAXG3 ||
					originalFormat == FREE_IMAGE_FORMAT.FIF_ICO ||
					originalFormat == FREE_IMAGE_FORMAT.FIF_JPEG ||
					originalFormat == FREE_IMAGE_FORMAT.FIF_PCX ||
					originalFormat == FREE_IMAGE_FORMAT.FIF_PNG ||
					originalFormat == FREE_IMAGE_FORMAT.FIF_PSD ||
					originalFormat == FREE_IMAGE_FORMAT.FIF_TIFF)
				{
					result += (int)ImageFlags.HasRealDpi;
				}

				return result;
			}
		}

		/// <summary>
		/// Gets the width and height of this <see cref="FreeImageBitmap"/>.
		/// </summary>
		public SizeF PhysicalDimension
		{
			get
			{
				EnsureNotDisposed();
				return new SizeF((float)FreeImage.GetWidth(dib), (float)FreeImage.GetHeight(dib));
			}
		}

		/// <summary>
		/// Gets the pixel format for this <see cref="FreeImageBitmap"/>.
		/// </summary>
		public PixelFormat PixelFormat
		{
			get
			{
				EnsureNotDisposed();
				return FreeImage.GetPixelFormat(dib);
			}
		}

		/// <summary>
		/// Gets IDs of the property items stored in this <see cref="FreeImageBitmap"/>.
		/// </summary>
		public int[] PropertyIdList
		{
			get
			{
				EnsureNotDisposed();
				List<int> list = new List<int>();
				ImageMetadata metaData = new ImageMetadata(dib, true);

				foreach (MetadataModel metadataModel in metaData)
				{
					foreach (MetadataTag metadataTag in metadataModel)
					{
						list.Add(metadataTag.ID);
					}
				}

				return list.ToArray();
			}
		}

		/// <summary>
		/// Gets all the property items (pieces of metadata) stored in this <see cref="FreeImageBitmap"/>.
		/// </summary>
		public PropertyItem[] PropertyItems
		{
			get
			{
				EnsureNotDisposed();
				List<PropertyItem> list = new List<PropertyItem>();
				ImageMetadata metaData = new ImageMetadata(dib, true);

				foreach (MetadataModel metadataModel in metaData)
				{
					foreach (MetadataTag metadataTag in metadataModel)
					{
						list.Add(metadataTag.GetPropertyItem());
					}
				}

				return list.ToArray();
			}
		}

		/// <summary>
		/// Gets the format of this <see cref="FreeImageBitmap"/>.
		/// </summary>
		public ImageFormat RawFormat
		{
			get
			{
				EnsureNotDisposed();
				Attribute guidAttribute =
					Attribute.GetCustomAttribute(
						typeof(FreeImageBitmap), typeof(System.Runtime.InteropServices.GuidAttribute)
					);
				return (guidAttribute == null) ?
					null :
					new ImageFormat(new Guid(((GuidAttribute)guidAttribute).Value));
			}
		}

		/// <summary>
		/// Gets the width and height, in pixels, of this <see cref="FreeImageBitmap"/>.
		/// </summary>
		public Size Size
		{
			get
			{
				EnsureNotDisposed();
				return new Size(Width, Height);
			}
		}

		/// <summary>
		/// Gets or sets an object that provides additional data about the <see cref="FreeImageBitmap"/>.
		/// </summary>
		public Object Tag
		{
			get
			{
				EnsureNotDisposed();
				return tag;
			}
			set
			{
				EnsureNotDisposed();
				tag = value;
			}
		}

		/// <summary>
		/// Gets whether this <see cref="FreeImageBitmap"/> has been disposed.
		/// </summary>
		public bool IsDisposed
		{
			get
			{
				return disposed;
			}
		}

		/// <summary>
		/// Gets a new instance of a metadata representing class.
		/// </summary>
		public ImageMetadata Metadata
		{
			get
			{
				EnsureNotDisposed();
				return new ImageMetadata(dib, true);
			}
		}

		/// <summary>
		/// Gets or sets the comment of this <see cref="FreeImageBitmap"/>.
		/// Supported formats are JPEG, PNG and GIF.
		/// </summary>
		public string Comment
		{
			get
			{
				EnsureNotDisposed();
				return FreeImage.GetImageComment(dib);
			}
			set
			{
				EnsureNotDisposed();
				FreeImage.SetImageComment(dib, value);
			}
		}

		/// <summary>
		/// Returns whether this <see cref="FreeImageBitmap"/> has a palette.
		/// </summary>
		public bool HasPalette
		{
			get
			{
				EnsureNotDisposed();
				return (FreeImage.GetPalette(dib) != IntPtr.Zero);
			}
		}

		/// <summary>
		/// Gets or sets the entry used as transparent color in this <see cref="FreeImageBitmap"/>.
		/// Only works for 1-, 4- and 8-bpp.
		/// </summary>
		public int TransparentIndex
		{
			get
			{
				EnsureNotDisposed();
				return FreeImage.GetTransparentIndex(dib);
			}
			set
			{
				EnsureNotDisposed();
				FreeImage.SetTransparentIndex(dib, value);
			}
		}

		/// <summary>
		/// Gets the number of frames in this <see cref="FreeImageBitmap"/>.
		/// </summary>
		public int FrameCount
		{
			get
			{
				EnsureNotDisposed();
				int result = 1;
				if (!mdib.IsNull)
				{
					result = FreeImage.GetPageCount(mdib);
				}
				return result;
			}
		}

		/// <summary>
		/// Gets the ICCProfile structure of this <see cref="FreeImageBitmap"/>.
		/// </summary>
		public FIICCPROFILE ICCProfile
		{
			get
			{
				EnsureNotDisposed();
				return FreeImage.GetICCProfileEx(dib);
			}
		}

		/// <summary>
		/// Gets the format of the original image in case
		/// this <see cref="FreeImageBitmap"/> was loaded from a file or stream.
		/// </summary>
		public FREE_IMAGE_FORMAT ImageFormat
		{
			get
			{
				EnsureNotDisposed();
				return originalFormat;
			}
		}

		#endregion

		#region Methods

		/// <summary>
		/// Gets the bounds of this <see cref="FreeImageBitmap"/> in the specified unit.
		/// </summary>
		/// <param name="pageUnit">One of the <see cref="System.Drawing.GraphicsUnit"/> values indicating
		/// the unit of measure for the bounding rectangle.</param>
		/// <returns>The <see cref="System.Drawing.RectangleF"/> that represents the bounds of this
		/// <see cref="FreeImageBitmap"/>, in the specified unit.</returns>
		public RectangleF GetBounds(ref GraphicsUnit pageUnit)
		{
			EnsureNotDisposed();
			pageUnit = GraphicsUnit.Pixel;
			return new RectangleF(
					0f,
					0f,
					(float)FreeImage.GetWidth(dib),
					(float)FreeImage.GetHeight(dib));
		}

		/// <summary>
		/// Gets the specified property item from this <see cref="FreeImageBitmap"/>.
		/// </summary>
		/// <param name="propid">The ID of the property item to get.</param>
		/// <returns>The <see cref="PropertyItem"/> this method gets.</returns>
		public PropertyItem GetPropertyItem(int propid)
		{
			EnsureNotDisposed();
			ImageMetadata metadata = new ImageMetadata(dib, true);
			foreach (MetadataModel metadataModel in metadata)
			{
				foreach (MetadataTag tag in metadataModel)
				{
					if (tag.ID == propid)
					{
						return tag.GetPropertyItem();
					}
				}
			}
			return null;
		}

		/// <summary>
		/// Returns a thumbnail for this <see cref="FreeImageBitmap"/>.
		/// </summary>
		/// <param name="thumbWidth">The width, in pixels, of the requested thumbnail image.</param>