看起来这是缩放和位图的已知问题.请参阅此处的Google讨论 –
https://plus.google.com/+PaulThornton/posts/ACAHkJD3a84.我将引用Marco Cantu的想法：
I’ve found an internally reported issue of a similar case,but haven’t
found one that matches this scenario. Certainly worth adding to quality
portal. Having said this,I fear that bitmap-based operations and
scaling don’t really fit together very well,and it might be difficult
to have an all encompassing solution.
Let me explain with an example. Take a button. This is painted by FMX
with 9 sections (borders,corners,central part) so that regardless of
the size the bitmap elements are stretched in one direction at most,
often just draw. Stretching a single bitmap for the button to the
target size would break anti-aliasing and create a blurred image when
using colors.
This is example what happens with a ScaledLayout,given it takes the
complete final image and transforms it. ScaledLayout was originally
introduced with vector styles,and worked very well in that scenario.
With todays’s bitmap styles things get a bit more complex.
Regardless of this explanation of there the issue lies,I’d recommend reporting it on QC,and I’ll make sure it doesn’t get closed as design (it could naturally happen,this is how the system works) but that we do some investigation to address the issue — turning this into a feature request.
