Improve documentation regarding vertical layout.
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@ -1109,8 +1109,8 @@ FT_BEGIN_HEADER
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* FT_HAS_VERTICAL( face )
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*
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* @description:
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* A macro that returns true whenever a face object contains vertical
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* metrics.
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* A macro that returns true whenever a face object contains real
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* vertical metrics (and not only synthesized ones).
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*
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*/
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#define FT_HAS_VERTICAL( face ) \
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@ -2456,8 +2456,14 @@ FT_BEGIN_HEADER
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* @FT_LOAD_NO_SCALE always sets this flag.
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*
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* FT_LOAD_VERTICAL_LAYOUT ::
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* Load the glyph for vertical text layout. _Don't_ use it as it is
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* problematic currently.
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* Load the glyph for vertical text layout. In particular, the
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* `advance' value in the @FT_GlyphSlotRec structure is set to the
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* `vertAdvance' value of the `metrics' field.
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*
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* In case @FT_HAS_VERTICAL doesn't return true, you shouldn't use
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* this flag currently. Reason is that in this case vertical metrics
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* get synthesized, and those values are not always consistent across
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* various font formats.
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*
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* FT_LOAD_FORCE_AUTOHINT ::
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* Indicates that the auto-hinter is preferred over the font's native
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