588 static int HistoQueueInit(HistoQueue* const histo_queue, const int max_index) {  in HistoQueueInit()  argument
589   histo_queue->size = 0;  in HistoQueueInit()
597   histo_queue->max_size = max_index * max_index;  in HistoQueueInit()
600   histo_queue->queue = WebPSafeMalloc(histo_queue->max_size + 1,  in HistoQueueInit()
601                                       sizeof(*histo_queue->queue));  in HistoQueueInit()
602   return histo_queue->queue != NULL;  in HistoQueueInit()
605 static void HistoQueueClear(HistoQueue* const histo_queue) {  in HistoQueueClear()  argument
606   assert(histo_queue != NULL);  in HistoQueueClear()
607   WebPSafeFree(histo_queue->queue);  in HistoQueueClear()
620 static void UpdateQueueFront(HistoQueue* const histo_queue) {  in UpdateQueueFront()  argument
621   if (histo_queue->queue[histo_queue->size].cost_diff >= 0) return;  in UpdateQueueFront()
623   if (histo_queue->queue[histo_queue->size].cost_diff <  in UpdateQueueFront()
624       histo_queue->queue[0].cost_diff) {  in UpdateQueueFront()
625     SwapHistogramPairs(histo_queue->queue,  in UpdateQueueFront()
626                        histo_queue->queue + histo_queue->size);  in UpdateQueueFront()
628   ++histo_queue->size;  in UpdateQueueFront()
633   assert(histo_queue->size <= histo_queue->max_size);  in UpdateQueueFront()
664   HistoQueue histo_queue;  in HistogramCombineGreedy()  local
666   if (!HistoQueueInit(&histo_queue, image_histo_size) || clusters == NULL) {  in HistogramCombineGreedy()
675       PreparePair(histograms, i, j, &histo_queue.queue[histo_queue.size],  in HistogramCombineGreedy()
677       UpdateQueueFront(&histo_queue);  in HistogramCombineGreedy()
681   while (image_histo_size > 1 && histo_queue.size > 0) {  in HistogramCombineGreedy()
683     const int idx1 = histo_queue.queue[0].idx1;  in HistogramCombineGreedy()
684     const int idx2 = histo_queue.queue[0].idx2;  in HistogramCombineGreedy()
686     histograms[idx1]->bit_cost_ = histo_queue.queue[0].cost_combo;  in HistogramCombineGreedy()
697     copy_to = histo_queue.queue;  in HistogramCombineGreedy()
698     for (i = 0; i < histo_queue.size; ++i) {  in HistogramCombineGreedy()
699       HistogramPair* const p = histo_queue.queue + i;  in HistogramCombineGreedy()
705       if (p->cost_diff < histo_queue.queue[0].cost_diff) {  in HistogramCombineGreedy()
707         SwapHistogramPairs(histo_queue.queue, p);  in HistogramCombineGreedy()
712     histo_queue.size = (int)(copy_to - histo_queue.queue);  in HistogramCombineGreedy()
718                     &histo_queue.queue[histo_queue.size], histos);  in HistogramCombineGreedy()
719         UpdateQueueFront(&histo_queue);  in HistogramCombineGreedy()
735   HistoQueueClear(&histo_queue);  in HistogramCombineGreedy()