Why text seems blurry in the process of scale transform?

[潘陈峰]

I recently find that when I trigger a scale transform for text (just scale up), the text is blurry. After transform, the text becomes crisp again. I also find Safari behaves the same.

So I want to ask 

1) which step in text rendering causing blurry? 

2) if I want to avoid blurry, will it cause serious lagging?

Thanks in advance, I'm new to text rendering.

[Stephen Chenney]

When animating a transform, we most often take the initial scale and draw it into a texture on the GPU. We then scale the texture as if it were an image, without re-drawing the contents. Then when the animation finishes we re-draw.

I'm not sure that there is a way to prevent this behavior. But the system is designed this way to make animations smooth. Re-drawing on every frame would be much slower in general.

Stephen.

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[focus]

If we just scale the initial texture, why not apply the bigger scale factor to texture initially? I think it will make text seem crisp during the transform animation(Chrome V98.0.4758.109 seems to behaves in this way, but I'm not so sure)