add: img->last_scale_type = -1;
context: TFB_DrawImage_New (TFB_Canvas canvas){	TFB_Image *img = HMalloc (sizeof (TFB_Image));	img->mutex = CreateMutex ();	img->ScaledImg = NULL;	img->colormap_index = -1;	img->Palette = TFB_DrawCanvas_ExtractPalette (canvas);		if (img->Palette)	{		img->NormalImg = canvas;	}	else	{		img->NormalImg = TFB_DrawCanvas_ToScreenFormat (canvas);	}	return img;}