[android-developers] How to configure the default bitmap color format of the whole system?

I found in my system the bitmap color format is RGB565. That means,
everything rendered to the framebuffer is in RGB565.

So can I change this and configure it as ARGB8888?

I saw lots of code in the framework (framework/base/graphics/)
handling different formats, including RGB565, RGBA5551, ARGB8888, etc.
But I can't figure out where to configure the default color format.

Thank you all!

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