from LCD.hpp:583
class DrawStringInternalStruct
{
public:
uint16_t* frameBuffer;
const Rect* widgetArea;
int16_t widgetRectY;
const Rect* toDraw;
const StringVisuals* stringVisuals;
TextProvider* drawTextProvider;
DrawStringInternalStruct() :
frameBuffer(0), widgetArea(0), widgetRectY(0), toDraw(0), stringVisuals(0), drawTextProvider(0)
{
}
};