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