C# IImageByte.StrideInBytes方法代码示例

		public ImageBuffer(IImageByte sourceImage, IRecieveBlenderByte recieveBlender)
		{
			SetDimmensionAndFormat(sourceImage.Width, sourceImage.Height, sourceImage.StrideInBytes(), sourceImage.BitDepth, sourceImage.GetBytesBetweenPixelsInclusive(), true);
			int offset = sourceImage.GetBufferOffsetXY(0, 0);
			byte[] buffer = sourceImage.GetBuffer();
			byte[] newBuffer = new byte[buffer.Length];
			agg_basics.memcpy(newBuffer, offset, buffer, offset, buffer.Length - offset);
			SetBuffer(newBuffer, offset);
			SetRecieveBlender(recieveBlender);
		}

		protected void CopyFromNoClipping(IImageByte sourceImage, RectangleInt clippedSourceImageRect, int destXOffset, int destYOffset)
		{
			if (GetBytesBetweenPixelsInclusive() != BitDepth / 8
				|| sourceImage.GetBytesBetweenPixelsInclusive() != sourceImage.BitDepth / 8)
			{
				throw new Exception("WIP we only support packed pixel formats at this time.");
			}

			if (BitDepth == sourceImage.BitDepth)
			{
				int lengthInBytes = clippedSourceImageRect.Width * GetBytesBetweenPixelsInclusive();

				int sourceOffset = sourceImage.GetBufferOffsetXY(clippedSourceImageRect.Left, clippedSourceImageRect.Bottom);
				byte[] sourceBuffer = sourceImage.GetBuffer();
				int destOffset;
				byte[] destBuffer = GetPixelPointerXY(clippedSourceImageRect.Left + destXOffset, clippedSourceImageRect.Bottom + destYOffset, out destOffset);

				for (int i = 0; i < clippedSourceImageRect.Height; i++)
				{
					agg_basics.memmove(destBuffer, destOffset, sourceBuffer, sourceOffset, lengthInBytes);
					sourceOffset += sourceImage.StrideInBytes();
					destOffset += StrideInBytes();
				}
			}
			else
			{
				bool haveConversion = true;
				switch (sourceImage.BitDepth)
				{
					case 24:
						switch (BitDepth)
						{
							case 32:
								{
									int numPixelsToCopy = clippedSourceImageRect.Width;
									for (int i = clippedSourceImageRect.Bottom; i < clippedSourceImageRect.Top; i++)
									{
										int sourceOffset = sourceImage.GetBufferOffsetXY(clippedSourceImageRect.Left, clippedSourceImageRect.Bottom + i);
										byte[] sourceBuffer = sourceImage.GetBuffer();
										int destOffset;
										byte[] destBuffer = GetPixelPointerXY(
											clippedSourceImageRect.Left + destXOffset,
											clippedSourceImageRect.Bottom + i + destYOffset,
											out destOffset);
										for (int x = 0; x < numPixelsToCopy; x++)
										{
											destBuffer[destOffset++] = sourceBuffer[sourceOffset++];
											destBuffer[destOffset++] = sourceBuffer[sourceOffset++];
											destBuffer[destOffset++] = sourceBuffer[sourceOffset++];
											destBuffer[destOffset++] = 255;
										}
									}
								}
								break;

							default:
								haveConversion = false;
								break;
						}
						break;

					default:
						haveConversion = false;
						break;
				}

				if (!haveConversion)
				{
					throw new NotImplementedException("You need to write the " + sourceImage.BitDepth.ToString() + " to " + BitDepth.ToString() + " conversion");
				}
			}
		}

		public bool Attach(IImageByte sourceImage, int x1, int y1, int x2, int y2)
		{
			m_ByteBuffer = null;
			DettachBuffer();

			if (x1 > x2 || y1 > y2)
			{
				throw new Exception("You need to have your x1 and y1 be the lower left corner of your sub image.");
			}
			RectangleInt boundsRect = new RectangleInt(x1, y1, x2, y2);
			if (boundsRect.clip(new RectangleInt(0, 0, (int)sourceImage.Width - 1, (int)sourceImage.Height - 1)))
			{
				SetDimmensionAndFormat(boundsRect.Width, boundsRect.Height, sourceImage.StrideInBytes(), sourceImage.BitDepth, sourceImage.GetBytesBetweenPixelsInclusive(), false);
				int bufferOffset = sourceImage.GetBufferOffsetXY(boundsRect.Left, boundsRect.Bottom);
				byte[] buffer = sourceImage.GetBuffer();
				SetBuffer(buffer, bufferOffset);
				return true;
			}

			return false;
		}

		/// <summary>
		/// This will create a new ImageBuffer that references the same memory as the image that you took the sub image from.
		/// It will modify the original main image when you draw to it.
		/// </summary>
		/// <param name="imageContainingSubImage"></param>
		/// <param name="subImageBounds"></param>
		/// <returns></returns>
		public static ImageBuffer NewSubImageReference(IImageByte imageContainingSubImage, RectangleDouble subImageBounds)
		{
			ImageBuffer subImage = new ImageBuffer();
			if (subImageBounds.Left < 0 || subImageBounds.Bottom < 0 || subImageBounds.Right > imageContainingSubImage.Width || subImageBounds.Top > imageContainingSubImage.Height
				|| subImageBounds.Left >= subImageBounds.Right || subImageBounds.Bottom >= subImageBounds.Top)
			{
				throw new ArgumentException("The subImageBounds must be on the image and valid.");
			}
			int left = Math.Max(0, (int)Math.Floor(subImageBounds.Left));
			int bottom = Math.Max(0, (int)Math.Floor(subImageBounds.Bottom));
			int width = Math.Min(imageContainingSubImage.Width - left, (int)subImageBounds.Width);
			int height = Math.Min(imageContainingSubImage.Height - bottom, (int)subImageBounds.Height);
			int bufferOffsetToFirstPixel = imageContainingSubImage.GetBufferOffsetXY(left, bottom);
			subImage.AttachBuffer(imageContainingSubImage.GetBuffer(), bufferOffsetToFirstPixel, width, height, imageContainingSubImage.StrideInBytes(), imageContainingSubImage.BitDepth, imageContainingSubImage.GetBytesBetweenPixelsInclusive());
			subImage.SetRecieveBlender(imageContainingSubImage.GetRecieveBlender());

			return subImage;
		}