After using gpu, the demo does not display properly. But without using gpu, it works fine

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Next time please format your code like this:

```
your 
code 
here
```

It seems the opacity is not handled properly in gpu_blend.

I don’t have this board but I compared your dma2d_init function with the one from stm32f429 project and found that you set 0x00 instead of 0xff InputAlpha for the layers.