Method initIterators

src/app/tools/ink_processing.h:76–78

class SimpleInkProcessing : public InkProcessing<Derived> {
public:
  void initIterators(ToolLoop* loop, int x1, int y) {
    m_dstAddress = (typename ImageTraits::address_t)loop->getDstImage()->getPixelAddress(x1, y);
  }

  void moveIterators() {
    ++m_dstAddress;