I am trying to understand if it is possible to obtain the expected
size of a bitmap _before_ rendering it.
In general, this is *not* possible, especially if font hinting is
involved.
Thank you Werner for this clarification.
I ended you making a temporary copy of the raw pixel data in a set of
large buffer, then packing my atlas and copying the pixels back after
packaging. Rasterization is only done once. It's a little more code but
works better/faster.
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