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在 iOS 平台上，需要处理 NSData 的转换。这里使用 pinned 内存操作来安全拷贝数据，确保跨平台兼容性。
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If the number of candidates for each pixel grows too large (as is common in algorithms such as Knoll and Yliluoma) then sorting the candidate list for every pixel can have a significant impact on performance. A solution is to instead sort the palette in advance and keep a separate tally of weights for every palette colour. The weights can then be accumulated by iterating linearly through the tally of sorted colours.