block: Writes wait until buffer space is available. Use when you trust the producer to await writes properly.
圖像來源，BBC CHINESE/ TING CHIANG
。关于这个话题，91视频提供了深入分析
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On top of that, we can get two full pixels of color using foreground and background colors. If we render an upper block with a foreground color of cyan and a background color of red, we get a cyan pixel sitting on top of a red pixel!