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Loading fonts from external flash: RLE vs BW

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We managed to pack the arrays and structures of the c font file in a binary form. We are also able to load and unload such "binary" fonts into uGFX during runtime. My question is: how can we distinguish if the binary data in the font file is a RLE or a BW one based on the properties in struct mf_font_s? I assume that if the flags value is 2 (MF_FONT_FLAG_BW), then the file is a BW. RLE has flags value set to 0. Is this correct?

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