53 lines
2.2 KiB
C
53 lines
2.2 KiB
C
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#ifndef LSULINFO_DEFINED
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#define LSULINFO_DEFINED
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#include "lsdefs.h"
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#include "plsulinf.h"
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/*
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* Both Offsets are relative to the local baseline and positive "down" (towards blank page),
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* so in horizontal Latin case dvpFirstUnderlineOffset usually is bigger than zero.
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*
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* dvpUnderlineOrigin points to UnderlineOrigin - the place where (main part of the) letter ends and
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* area for underlining begins. For Latin letters it is the Latin baseline. UnderlineOrigin shows if
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* one run of two runs is higher; runs with the same UnderlineOrigin can have their underlines averaged.
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*
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* dvpFirstUnderlineOffset points to the beginning of the closest to the UnderlineOrigin underline.
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* You have "underlining from above" case if dvpUnderlineOrigin > dvpFirstUnderlineOffset.
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*
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* Everything else should be positive. Instead of dvpSecondUnderlineOffset of the previous version dvpGap
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* is used. Second underline is further away from the UnderlineOrigin than first underline, so
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* dvpSecondUnderlineOffset = dvpFirstUnderlineOffset + dvpFirstUnderlineSize + dvpGap in normal case.
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* In "underlining from above" case there will be minuses instead of pluses.
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*
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* Main merging rules:
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*
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* LS will not merge runs with different kulbase or different cNumberOfLines.
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* LS will not merge runs with different negative dvpPos (subscripts)
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* LS will not merge subscripts with superscripts or baseline runs
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* LS will not merge "underlined above" run with "underlined below" run.
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*
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* If merging is possible:
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* Runs with the same UnderlineOrigin are averaged.
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* If UnderlineOrigins are different, the run with higher UnderlineOrigin takes metrics from neighbor.
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*/
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struct lsulinfo
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{
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UINT kulbase; /* base kind of underline */
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DWORD cNumberOfLines; /* number of lines: possible values 1,2*/
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long dvpUnderlineOriginOffset; /* UnderlineOrigin decides which run is higher */
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long dvpFirstUnderlineOffset; /* offset for start of the (first) underline */
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long dvpFirstUnderlineSize; /* width of the (first) underline */
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long dvpGapBetweenLines; /* If NumberOfLines != 2, dvpGapBetweenLines */
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long dvpSecondUnderlineSize; /* and dvpSecondUnderlineSize are ignored. */
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};
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typedef struct lsulinfo LSULINFO;
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#endif /* !LSULINFO_DEFINED */
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