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Add some comment for pr #384

This commit is contained in:
halx99 2021-06-17 21:56:38 +08:00
parent ffda7422c9
commit bafcac20c1
1 changed files with 5 additions and 1 deletions
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4
cocos/2d/CCFontFreeType.cpp
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@ -233,6 +233,10 @@ bool FontFreeType::createFontObject(const std::string &fontName, float fontSize)
// store the face globally // store the face globally
_fontRef = face; _fontRef = face;
auto* ttSize = (TT_Size)(_fontRef->size); auto* ttSize = (TT_Size)(_fontRef->size);
// Notes:
// a. ttSize->metrics->height: (ttSize->metrics->ascender - ttSize->metrics->descender)
// b. ftSize->metrics.height == ttSize->metrics->height
// c. the TT spec always asks for ROUND, not FLOOR or CEIL, see also freetype: ttobjs.c
_lineHeight = static_cast<int>((ttSize->metrics->ascender - ttSize->metrics->descender) >> 6); _lineHeight = static_cast<int>((ttSize->metrics->ascender - ttSize->metrics->descender) >> 6);
// done and good // done and good