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Improve documentation regarding vertical layout.

This commit is contained in:
Werner Lemberg 2012-10-07 22:36:46 +02:00
parent be81ec22cc
commit 4f18d457e2
1 changed files with 10 additions and 4 deletions
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14
include/freetype/freetype.h
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@ -1109,8 +1109,8 @@ FT_BEGIN_HEADER
* FT_HAS_VERTICAL( face )
*
* @description:
* A macro that returns true whenever a face object contains vertical
* metrics.
* A macro that returns true whenever a face object contains real
* vertical metrics (and not only synthesized ones).
*
*/
#define FT_HAS_VERTICAL( face ) \
@ -2456,8 +2456,14 @@ FT_BEGIN_HEADER
* @FT_LOAD_NO_SCALE always sets this flag.
*
* FT_LOAD_VERTICAL_LAYOUT ::
* Load the glyph for vertical text layout. _Don't_ use it as it is
* problematic currently.
* Load the glyph for vertical text layout. In particular, the
* `advance' value in the @FT_GlyphSlotRec structure is set to the
* `vertAdvance' value of the `metrics' field.
*
* In case @FT_HAS_VERTICAL doesn't return true, you shouldn't use
* this flag currently. Reason is that in this case vertical metrics
* get synthesized, and those values are not always consistent across
* various font formats.
*
* FT_LOAD_FORCE_AUTOHINT ::
* Indicates that the auto-hinter is preferred over the font's native