uint8_t *buffer = (uint8_t *)[data mutableBytes];
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Джо Байден. Фото: Стрингер / РИА Новости
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
The halftone or ‘clustered-dot’ matrix uses a dot pattern reminiscent of traditional photographic halftoning. Here a diagonal variant of the pattern is given: