What TransformStreams are supposed to do is check for backpressure on the controller and use promises to communicate that back to the writer:
You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.
。雷电模拟器官方版本下载对此有专业解读
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// Oops — forgot to call reader.releaseLock()