Graphics how to set callbacks to C- functions

Hmm, I tried to figure out, how to use graphicsInternal, .....
and found only something in lcd_st7789-8bit where setPixel is not set again.

Next try was to add JSGRAPHICSTYPE_OTHERS in JsGraphicsType (graphics.h)
and an if-statement in graphicsSetCallbacks(graphics.c) to skip xxxSetCallbacks.
In my own driver, this worked fine, but in all functions from jswrap_graphics(for example setPixel) I've got runtime error. Looks to me like setCallback is necessary (?)

My actual solution for my problem is to add a weak function for JSGRAPHICSTYPE_OTHERS, which can be overroled in my driver. My driver for ILI9341 now is much faster compared to JS-solution.

See following sources.
If this is of interest for Espruino, I would create a pull request.

graphics.h:

typedef enum {
  JSGRAPHICSTYPE_ARRAYBUFFER, ///< Write everything into an ArrayBuffer
  JSGRAPHICSTYPE_JS,          ///< Call JavaScript when we want to write something
  JSGRAPHICSTYPE_FSMC,        ///< FSMC (or fake FSMC) ILI9325 16bit-wide LCDs
  JSGRAPHICSTYPE_SDL,         ///< SDL graphics library for linux
  JSGRAPHICSTYPE_SPILCD,      ///< SPI LCD library
  JSGRAPHICSTYPE_ST7789_8BIT, ///< ST7789 in 8 bit mode
  JSGRAPHICSTYPE_MEMLCD,      ///< Memory LCD
  JSGRAPHICSTYPE_LCD_SPI_UNBUF, ///< LCD SPI unbuffered 16 bit driver
  JSGRAPHICSTYPE_OTHERS  ///< Driver that support callbacks only
} JsGraphicsType;
bool graphicsSetCallbacksOthers(JsGraphics *gfx);

graphics.c:

/// Set up the callbacks for this graphics instance (usually done by graphicsGetFromVar)
__attribute__((weak))bool graphicsSetCallbacksOthers(JsGraphics *gfx){
  return false;
}

bool graphicsSetCallbacks(JsGraphics *gfx) {
  if(gfx->data.type >= JSGRAPHICSTYPE_OTHERS){
	return graphicsSetCallbacksOthers(gfx);
  }

Last not least in myOwnDriver.c:

bool graphicsSetCallbacksOthers(JsGraphics *gfx){
  gfx->setPixel = myOwnCallbackSetPixel;
  gfx->fillRect = myOwnCallbackFillRect;
  return true;
}