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stbtt_GetGlyphSDF() yoff return negative values. #1700
Description
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)
Activity
blackedout01 commentedon Oct 7, 2024
I think that's because
yoffis relative to the baseline of the character. It looks like yourcurrent.yis the top of where you are drawing, but it should be the baseline.