Overwrite image buffer (inside Adafruit SSD1306)

Question

I'd like to add a method that replaces the entire image buffer into the Adafruit_SSD1306 library. I haven't worked with dynamic memory handling for ages and I'm not sure how to just simply overwrite its pointer to point to a different memory address where my newBuffer is.

static uint8_t buffer[SSD1306_LCDHEIGHT * SSD1306_LCDWIDTH / 8] = {}

void Adafruit_SSD1306::setBuffer(uint8_t * newBuffer) {
  buffer = newBuffer; // not sure which operator to use
}

Update: Passing by reference wouldn't work. The question is: how to overwrite by copying? Would it work well with memcpy?

void Adafruit_SSD1306::setBuffer(uint8_t * newBuffer) {
  memcpy(newBuffer, buffer, (SSD1306_LCDWIDTH * SSD1306_LCDHEIGHT / 8));
}

Update: The code above doesn't seem to making anything. This one neither:

void Adafruit_SSD1306::setBuffer(uint8_t * newBuffer) {
  for(int16_t i = 0; i < SSD1306_LCDWIDTH * SSD1306_LCDHEIGHT / 8; i++) {
    buffer[i] = 255; // experimenting
  }
}

Update: setPixel doesn't work either. - Needed display.display(); :)