8_24 conversion

It doesn't seem to be defined anywhere, but a suitable definition would presumably be:

#define SIGMASTUDIOTYPE_8_24_CONVERT(x) ((int32_t)((x)*0x1000000))

I suppose that actually is:

#define SIGMASTUDIOTYPE_8_24_CONVERT(x) ((int32_t)((x)* 0x01 << 24))

But the real question is whether I can use it in my own code or I have to define an equivalent mine.

Oh, that seems to be missing in the export files I checked (which were just some random old export I had sitting around).

That definition is actually wrong though due to operator precedence, and will result in a compile error if you try to use a constant that uses the macro if defined like that:

test.c:2:62: error: invalid operands to binary << (have ‘double’ and ‘int’)
2 | #define SIGMASTUDIOTYPE_8_24_CONVERT(x) ((int32_t)((x)* 0x01 << 24))
| ~~~~~~~~~ ^~
| |
| double

It needs parentheses around the "0x01 << 24", at which point it's 100% equivalent to the definition I gave (except I just wrote 0x1000000 instead of 1 << 24).

I'm not sure what you mean by your question.