Improve documentation of the various advance values.
diff --git a/include/freetype/freetype.h b/include/freetype/freetype.h
index 9e74f11..e74f319 100644
--- a/include/freetype/freetype.h
+++ b/include/freetype/freetype.h
@@ -231,6 +231,10 @@ FT_BEGIN_HEADER
/* vertAdvance :: */
/* Advance height for vertical layout. */
/* */
+ /* <Note> */
+ /* If not disabled with @FT_LOAD_NO_HINTING, the values represent */
+ /* dimensions of the hinted glyph (in case hinting is applicable). */
+ /* */
typedef struct FT_Glyph_Metrics_
{
FT_Pos width;
@@ -1477,8 +1481,13 @@ FT_BEGIN_HEADER
/* important to perform correct WYSIWYG layout. */
/* Only relevant for outline glyphs. */
/* */
- /* advance :: This is the transformed advance width for the */
- /* glyph (in 26.6 fractional pixel format). */
+ /* advance :: This shorthand is, depending on */
+ /* @FT_LOAD_IGNORE_TRANSFORM, the transformed */
+ /* advance width for the glyph (in 26.6 */
+ /* fractional pixel format). As specified with */
+ /* @FT_LOAD_VERTICAL_LAYOUT, it uses either the */
+ /* `horiAdvance' or the `vertAdvance' value of */
+ /* `metrics' field. */
/* */
/* format :: This field indicates the format of the image */
/* contained in the glyph slot. Typically */