14     char*   fBegin; // start of used section in this chunk  member
23         fBegin  = fEnd = nullptr;  in init()
80     if (nullptr == first->fBegin) {  in push_front()
85         begin = first->fBegin - fElemSize;  in push_front()
96     first->fBegin = begin;  in push_front()
120     if (nullptr == last->fBegin) {  in push_back()
122         last->fBegin = last->start();  in push_back()
123         end = last->fBegin + fElemSize;  in push_back()
158     if (first->fBegin == nullptr) {  // we were marked empty from before  in pop_front()
166     char* begin = first->fBegin + fElemSize;  in pop_front()
170         first->fBegin = begin;  in pop_front()
171         SkASSERT(first->fBegin);  in pop_front()
172         fFront = first->fBegin;  in pop_front()
174         first->fBegin = first->fEnd = nullptr;  // mark as empty  in pop_front()
178             SkASSERT(first->fNext->fBegin);  in pop_front()
179             fFront = first->fNext->fBegin;  in pop_front()
201     SkASSERT(end >= last->fBegin);  in pop_back()
203     if (end > last->fBegin) {  in pop_back()
208         last->fBegin = last->fEnd = nullptr;    // mark as empty  in pop_back()
257             } while (fCurBlock != nullptr && fCurBlock->fBegin == nullptr);  in next()
258             next = fCurBlock ? fCurBlock->fBegin : nullptr;  in next()
272         SkASSERT(prev >= fCurBlock->fBegin - fElemSize);  in prev()
273         if (prev < fCurBlock->fBegin) { // exhausted this chunk, move to prior  in prev()
295         while (fCurBlock && nullptr == fCurBlock->fBegin) {  in reset()
298         fPos = fCurBlock ? fCurBlock->fBegin : nullptr;  in reset()