能不能加个双三次缩放

[whiteshore]

Expected behavior 预期的功能

能不能加个双三次插值缩放，acnet和anime有时效果不是很好

Alternative behavior (optional) 近似的功能（可选）

No response

[Blinue]

Mitchell 就是双三次插值

维基百科：The Mitchell–Netravali filters or BC-splines are a group of reconstruction filters used primarily in computer graphics, which can be used, for example, for anti-aliasing or for scaling raster graphics. They are also known as bicubic filters in image editing programs because they are bi-dimensional cubic splines.

[hooke007]

mitchell == b=c=1/3的bicubic b越大越糊，c越大越产生振铃，mitchell在数学上是几乎完美的bicubic 这两参数的不同演变了出了众多算法

理论上只要支持自定义b c就能实现 hermite/spline/robidoux/catrom。。。

[Blinue]

https://github.com/Blinue/Magpie/blob/d6e4043d158e9456da3ee42b2f7f3563d5940c46/Effects/Mitchell.hlsl#L55-L73

b 和 c 可以自定义