Support for more image processing functions (DSP-81)

[X-Ryl669]

It would be great if there was support for some image processing operations like:

1. Alpha blending (a bit like: out = x * alpha + y * (1 - alpha))
2. Conversion from/to difference colorspace (RGB888 <=> RGB565)
3. Optimized blitting (copying some memory area to some other memory area, maybe using the new DMA engine in ESP32 S3)
4. Texture mapping ( out = bilinear(img, [x,y]) with x,y in |R not |N)
5. etc...

Many LCD library have to deal with RGB565 format, and constantly changing from masked u16 (red = c & 0xF800 >> 8, etc...) to i16 for operations and back to u16 is very costly in terms of performance. There might be improvement to get here when using primitives from Xtensa (like MAC16, maybe).

[dmitry1945]

Hi @X-Ryl669 ,
We have a plans to include it in this year.

Regards,
Dmitry