stbtt_GetGlyphSDF() yoff return negative values.

[Intervel]

why does yoff return negative values?

f32 scale = stbtt_ScaleForMappingEmToPixels(&fontInfo, 64.0f);
i32 padding = 5;
u8 onedgeValue = 180;
f32 pixelDistScale = 180 / 5.0;

i32 glyphIndex = stbtt_FindGlyphIndex(&fontInfo, codepoint);

i32 advance{0}; i32 lsb{0};
stbtt_GetGlyphHMetrics(&fontInfo, glyphIndex, &advance, &lsb);

i32 width{0}; i32 height{0}; i32 xoff{0}; i32 yoff{0};
u8* sdf = stbtt_GetGlyphSDF(&fontInfo, scale, glyphIndex, padding, onedgeValue, pixelDistScale, &width, &height, &xoff, &yoff);

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this is how i store it into json.

json glyph;
glyph["width"] = width;
glyph["height"] = height;
glyph["xadvance"] = (advance * scale);
glyph["xoff"] = xoff;
glyph["yoff"] = yoff;
glyph["texcoord"] = { texTop, texRight, texBottom, texLeft };

somehow, because its negative, it place it above. is this a bug?
tried to open this json file, yoff is mostly negative. be aware im using the SDF function one. stbtt_GetGlyphSDF()
Roboto-Regular.json

this is how i put it on screen

//f32 posY   = current.y - (mFont->getCharacters()[currentUnicode].size.y - mFont->getCharacters()[currentUnicode].offset.y) * text.fontSize;
f32 posY   = current.y + (mFont->getCharacters()[currentUnicode].offset.y) * text.fontSize;

// yoff = mFont->getCharacters()[currentUnicode].offset.y)

[blackedout01]

I think that's because yoff is relative to the baseline of the character. It looks like your current.y is the top of where you are drawing, but it should be the baseline.