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How to rotate an image without losing quality?

Hi,
I define edc file, for example, for a minute hand of a watch:

part {
  name: "img.minute.hand";
  type: IMAGE;
...
   map {
     on: 1;
     rotation {
       x: 0.0;
       y: 0.0;
       z: 0.0;
...

How to rotate an image without losing quality? After rotation (f.e. z=345.0 deg) are the edges of the image pixelated (checkered). The "smooth: 1" prediction has no effect.

When I using a Galaxy Watch Designer, the image quality is not damaged when rotated.

OR

I won't define the edc file, but I'll use the C code only. Is it possible to insert several transparent png images into a container over each other (overlay)?

Thank you very much.
MS

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