I don't think bitmaps are a good idea, keep your font in text format with characters indexed by code unit:
immutable string[][] font=[
...
[ //'i'
"*",
"*",
"*",
"*",
"*"],
...
[ //'s'
"*****",
"*    ",
"*****",
"    *",
"*****"],
...
];

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