mirror of https://github.com/nmlgc/ReC98.git
25 lines
963 B
C++
25 lines
963 B
C++
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/// Run-length encoded, 16-color, image format using hardcoded sizes
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/// ----------------------------------------------------------------
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/// TH01 has no generic implementation of this format, only the specialized
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/// one for the HUD, loading and blitting MASK.GRF. Which only reads the first
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/// bitplane from that file – the other ones are exactly identical, though.
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/// However, the 4 size fields, as well as the palette, indicate that .GRF was
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/// in fact originally designed as a 16-color format.
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///
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/// In contrast to .GRX, .GRF uses a separate RLE command + pixel data stream
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/// for each bitplane, with a customizable [rle_run_byte].
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#define GRF_MAGIC "HGRF"
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#pragma push(pack, 1)
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typedef struct {
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char magic[sizeof(GRF_MAGIC) - 1];
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int8_t unknown1; // Image count?
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uint8_t rle_run_byte;
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int16_t unknown2;
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Planar<uint16_t> rle_size;
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Palette4 pal;
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} grf_header_t;
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#pragma pop
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/// ----------------------------------------------------------------
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