15     char*   fEnd;   // end of used section in this chunk  member
23         fBegin  = fEnd = nullptr;  in init()
82         first->fEnd = first->fStop;  in push_front()
125         end = last->fEnd + fElemSize;  in push_back()
136     last->fEnd = end;  in push_back()
167     SkASSERT(begin <= first->fEnd);  in pop_front()
169     if (begin < fFrontBlock->fEnd) {  in pop_front()
174         first->fBegin = first->fEnd = nullptr;  // mark as empty  in pop_front()
192     if (last->fEnd == nullptr) {  // we were marked empty from before  in pop_back()
200     char* end = last->fEnd - fElemSize;  in pop_back()
204         last->fEnd = end;  in pop_back()
205         SkASSERT(last->fEnd);  in pop_back()
206         fBack = last->fEnd - fElemSize;  in pop_back()
208         last->fBegin = last->fEnd = nullptr;    // mark as empty  in pop_back()
212             SkASSERT(last->fPrev->fEnd);  in pop_back()
213             fBack = last->fPrev->fEnd - fElemSize;  in pop_back()
253         SkASSERT(next <= fCurBlock->fEnd);  in next()
254         if (next == fCurBlock->fEnd) { // exhausted this chunk, move to next  in next()
276             } while (fCurBlock != nullptr && fCurBlock->fEnd == nullptr);  in prev()
277             prev = fCurBlock ? fCurBlock->fEnd - fElemSize : nullptr;  in prev()
302         while (fCurBlock && nullptr == fCurBlock->fEnd) {  in reset()
305         fPos = fCurBlock ? fCurBlock->fEnd - fElemSize : nullptr;  in reset()