Const uint8_t asked, how to display an image which may vary?

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2

if your bitmap is in flash storage (PROGMEM attribute) then you can't change it. In order to change something it needs to be in SRAM and not declared as const

the fact that the function's signature says const uint8_t& does no mean you need to pass a const data reference but that the function won't modify it.

so define

uint8_t aBitmap[] = {151,146,242,146,151,0,255,0};  // 8x8 bitmap

and call the display

drawBitmap(0, 0,  aBitmap, 8, 8, BLACK,  WHITE); // assuming the first parameters are (x,y) and the other (w,h)