16     char*   fEnd;   // end of used section in this chunk  member
24         fBegin  = fEnd = nullptr;  in init()
83         first->fEnd = first->fStop;  in push_front()
126         end = last->fEnd + fElemSize;  in push_back()
137     last->fEnd = end;  in push_back()
168     SkASSERT(begin <= first->fEnd);  in pop_front()
170     if (begin < fFrontBlock->fEnd) {  in pop_front()
175         first->fBegin = first->fEnd = nullptr;  // mark as empty  in pop_front()
193     if (last->fEnd == nullptr) {  // we were marked empty from before  in pop_back()
201     char* end = last->fEnd - fElemSize;  in pop_back()
205         last->fEnd = end;  in pop_back()
206         SkASSERT(last->fEnd);  in pop_back()
207         fBack = last->fEnd - fElemSize;  in pop_back()
209         last->fBegin = last->fEnd = nullptr;    // mark as empty  in pop_back()
213             SkASSERT(last->fPrev->fEnd);  in pop_back()
214             fBack = last->fPrev->fEnd - fElemSize;  in pop_back()
254         SkASSERT(next <= fCurBlock->fEnd);  in next()
255         if (next == fCurBlock->fEnd) { // exhausted this chunk, move to next  in next()
277             } while (fCurBlock != nullptr && fCurBlock->fEnd == nullptr);  in prev()
278             prev = fCurBlock ? fCurBlock->fEnd - fElemSize : nullptr;  in prev()
303         while (fCurBlock && nullptr == fCurBlock->fEnd) {  in reset()
306         fPos = fCurBlock ? fCurBlock->fEnd - fElemSize : nullptr;  in reset()