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The 2-bit RLE encoding, in addition to supporting colour is also fully
ROMable meaning we can save 32 bytes of RAM per image by switching to
2-bit encoding.
Switch everything in icons and font.clock over to 2-bit encoding.
Note: this requires all the clock PNG files to be reencoded (because
they were originally in 1-bit grayscale format and this is no
longer supported by the encoder).
This reduces RAM overhead by 480 bytes and has only a negligable effect
on FLASH usage (+4 bytes).
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
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At 36pt this is already gobbling a fair bit of flash so, for now, we've
restricted this only numerals (and colon).
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This is a useful but modest optimization (maybe 3% in string
rendering.
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