using System;
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using System.Drawing;
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using System.Reflection;
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namespace Microsoft.Drawing
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{
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/// <summary>
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/// BufferedGraphicsEx辅助类
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/// </summary>
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public static class BufferedGraphicsEx
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{
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private static readonly FieldInfo FiTargetLoc; //BufferedGraphics.targetLoc字段信息
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private static readonly FieldInfo FiVirtulSize; //BufferedGraphics.virtualSize字段信息
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/// <summary>
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/// 静态构造
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/// </summary>
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static BufferedGraphicsEx()
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{
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Type type = typeof(BufferedGraphics);
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BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
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FiTargetLoc = type.GetField("targetLoc", flags);
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FiVirtulSize = type.GetField("virtualSize", flags);
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if (FiTargetLoc is null)
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FiTargetLoc = type.GetField("_targetLoc", flags);
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if (FiVirtulSize == null)
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FiVirtulSize = type.GetField("_virtualSize", flags);
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}
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/// <summary>
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/// 获取缓冲区的目标坐标。
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/// </summary>
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/// <param name="bg">缓冲区。</param>
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/// <returns>缓冲区的目标坐标</returns>
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public static Point GetTargetLoc(BufferedGraphics bg)
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{
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if (bg == null)
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throw new ArgumentNullException("bg");
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return (Point)FiTargetLoc.GetValue(bg);
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}
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/// <summary>
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/// 获取缓冲区的虚拟尺寸大小。
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/// </summary>
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/// <param name="bg">缓冲区。</param>
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/// <returns>缓冲区的虚拟尺寸大小。</returns>
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public static Size GetVirtualSize(BufferedGraphics bg)
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{
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if (bg == null)
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throw new ArgumentNullException("bg");
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return (Size)FiVirtulSize.GetValue(bg);
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}
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/// <summary>
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/// 将图形缓冲区的内容写入指定的 System.Drawing.Graphics 对象。
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/// </summary>
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/// <param name="bgSrc">图形缓冲区，要混合的源。</param>
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/// <param name="gDest">一个 System.Drawing.Graphics 对象，要向其中写入图形缓冲区的内容。</param>
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/// <param name="rcDest">目标矩形。</param>
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public static void Render(BufferedGraphics bgSrc, Graphics gDest, Rectangle rcDest)
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{
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//验证
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if (bgSrc == null || gDest == null || !RectangleEx.IsVisible(rcDest))
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return;
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//反射获取私有字段
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if (FiTargetLoc.GetValue(bgSrc) is Point targetLoc)
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{
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targetLoc.Offset(rcDest.X, rcDest.Y);
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Size virtualSize = rcDest.Size;
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Point sourceLoc = rcDest.Location;
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//混合渲染
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GraphicsEx.Render(bgSrc.Graphics, gDest, targetLoc, sourceLoc, virtualSize);
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}
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}
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/// <summary>
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/// 将图形缓冲区的内容与指定的 System.Drawing.Graphics 对象混合。(支持缓冲区Alpha通道)
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/// </summary>
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/// <param name="bgSrc"></param>
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/// <param name="gDest">一个 System.Drawing.Graphics 对象，图形缓冲区要混合的目标。</param>
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public static void BlendRender(BufferedGraphics bgSrc, Graphics gDest)
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{
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//验证
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if (bgSrc == null || gDest == null)
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return;
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//反射获取私有字段
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Point targetLoc = (Point)FiTargetLoc.GetValue(bgSrc);
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Size virtualSize = (Size)FiVirtulSize.GetValue(bgSrc);
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//混合渲染
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GraphicsEx.BlendRender(bgSrc.Graphics, gDest, targetLoc, Point.Empty, virtualSize);
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}
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/// <summary>
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/// 将图形缓冲区的内容与指定的 System.Drawing.Graphics 对象混合。(支持缓冲区Alpha通道)
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/// </summary>
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/// <param name="bgSrc">图形缓冲区，要混合的源。</param>
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/// <param name="gDest">一个 System.Drawing.Graphics 对象，图形缓冲区要混合的目标。</param>
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/// <param name="rcDest">目标矩形。</param>
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public static void BlendRender(BufferedGraphics bgSrc, Graphics gDest, Rectangle rcDest)
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{
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//验证
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if (bgSrc == null || gDest == null || !RectangleEx.IsVisible(rcDest))
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return;
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//反射获取私有字段
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Point targetLoc = (Point)FiTargetLoc.GetValue(bgSrc);
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targetLoc.Offset(rcDest.X, rcDest.Y);
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Size virtualSize = rcDest.Size;
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Point sourceLoc = rcDest.Location;
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//混合渲染
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GraphicsEx.BlendRender(bgSrc.Graphics, gDest, targetLoc, sourceLoc, virtualSize);
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}
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}
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}
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