As @allObjects points out above it looks like you're better off using a Graphics instance that's 8 pixels high (with vertical byte). While it 'wastes' one pixel per column (which isn't much for 5 columns!) it means it's way easier to access the Graphics ArrayBuffer's data!
i do not understand why by this way vs by the other one.... :(
don't understand how to extract dot on a line.
because it seems easier to push out line by line... i'm lost
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