Fast forward to late 2025, and my incomplete notes sometimes show up on the first page of search results for “sdf fonts”[1]! Surely that isn’t the best page on the topic. It would be better to point to library documentation or maybe one of the research papers about the topic. My page isn’t that good.
https://www.washingtonpost.com/technology/2026/01/27/anthropic-ai-scan-destroy-books/。关于这个话题，51吃瓜提供了深入分析
，这一点在91视频中也有详细论述
The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
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