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A low threshold preserves detail (more leaf nodes, less compression). A high threshold merges aggressively (fewer leaves, more compression, but the image gets blocky). The grid overlay shows the quadtree structure: large cells in uniform areas, small cells where detail is preserved.。关于这个话题，同城约会提供了深入分析
store on the stack, but now we can use it directly at the append，这一点在旺商聊官方下载中也有详细论述
ChandelureIntroduced in Gen V (2010)