rem: TFB_DrawCanvas_GetScaledExtent (TFB_Canvas src_canvas, int scale, PEXTENT size)
add: TFB_DrawCanvas_GetScaledExtent (TFB_Canvas src_canvas, TFB_Canvas src_mipmap, int scale, PEXTENT size)
context: TFB_DrawCanvas_GetScaledExtent (TFB_Canvas src_canvas, int scale, PEXTENT size){	SDL_Surface *src = (SDL_Surface *)src_canvas;	size->width = (int) (src->w * scale / (float)GSCALE_IDENTITY);	size->height = (int) (src->h * scale / (float)GSCALE_IDENTITY);	if (!size->width && src->w)		size->width = 1;	if (!size->height && src->h)		size->height = 1;}