Direct2D1.RenderTarget.FillOpacityMask 如何工作

如何解决Direct2D1.RenderTarget.FillOpacityMask 如何工作

我想通过遮罩绘制图片，并使用此 APIFillOpacityMask(Bitmap opacityMask,Brush Brush,OpacityMaskContent content,RawRectangleF? destinationRectangle,RawRectangleF? sourceRectangle); 然后，发生了一些奇怪的事情。如果我使用 FillOpacityMask(opacityMask,brush,content)，它可以工作并且我在左上角得到一张正确的图片，就像这张图片。但是，当我使用FillOpacityMask(opacityMask,content,destinationRectangle,sourceRectangle)时，它无法工作，只能在左侧或顶部绘制，其中红色框the description picture 这是我的代码的一部分

 public void DrawTexture2DWithMask(
        ITexture2D texture2D,RectangleF destRectangle,ITexture2D maskTexture2D,RectangleF sourceRectangle
       
        )
    {
        SharpDX.Direct2D1.OpacityMaskContent content = SharpDX.Direct2D1.OpacityMaskContent.TextNatural;
        Direct2DTexture2D Texture2D = texture2D as Direct2DTexture2D;
        Direct2DTexture2D MaskTexture2D = maskTexture2D as Direct2DTexture2D;

        rendertargetPrivate.AntialiasMode = SharpDX.Direct2D1.AntialiasMode.Aliased;
        var brush = new SharpDX.Direct2D1.BitmapBrush(rendertargetPrivate,Texture2D.Texture2D);
        brush.InterpolationMode = SharpDX.Direct2D1.BitmapInterpolationMode.Linear;


        rendertargetPrivate.FillOpacityMask(
            MaskTexture2D.Texture2D,content
            //,destRectangle.ToRawRectangleF(),//sourceRectangle.ToRawRectangleF()

            );

    }