Our previous display uses all 8 sprites to produce the rivets and shadows: one sprite for each corner, and then two expanded sprites each for the left and bottom sides. We now wish to add new sprites to represent drop shadows for each of the puzzle cells. Those cells are each squares 3 characters to a side (so, a 24×24 pixel region), but thanks to the bezels around each button, the shadow itself only needs to be 19 pixels tall. That fits neatly into our 24×21 sprite space.
Армия России продвинулась в Сумской области14:51
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block: Writes wait until buffer space is available. Use when you trust the producer to await writes properly.