如何指定 WPF Image 使用的图像缩放算法?

问题描述

有没有办法指定如何在 Image 元素中放大图像，其中 LayoutTransform 设置为具有整数值的 ScaleTransformScaleX 和 ScaleY?

Is there a way to specify how an image is scaled up in an Image element with LayoutTransform set to a ScaleTransform with integer values for ScaleX and ScaleY?

我想清晰地显示缩放后的图像(即使用最近邻"缩放)，没有模糊.(想象一下您希望位图编辑程序在放大时的行为方式).

I want to display the scaled image crisply (ie using 'nearest neighbour' scaling), with no blurring. (Imagine how you would want a bitmap editing program to behave when zooming in).

我注意到 Image 上的受保护属性 VisualBitmapScalingMode，因此创建了一个 Image 的子类，将该属性设置为 BitmapScalingMode.NearestNeighbor.然而，这没有效果.

I noticed the protected property VisualBitmapScalingMode on Image, so created a subclass of Image that sets this property to BitmapScalingMode.NearestNeighbor. However, this had no effect.

推荐答案

我通过在我的 Image 子类中覆盖 OnRender 并在绘制图像之前设置 VisualBitmapScalingMode 解决了这个问题:

I fixed this by overriding OnRender in my Image subclass, and setting the VisualBitmapScalingMode before drawing the image:

class MyImage : System.Windows.Controls.Image
  {
    protected override void OnRender(DrawingContext dc)
    {
      this.VisualBitmapScalingMode = System.Windows.Media.BitmapScalingMode.NearestNeighbor;
      base.OnRender(dc);
    }
  }

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