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Fix metrics of math characters with 0 width

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It seems that QTextLayout does not handle properly a single character
with 0 width. This breaks drawing of things like \not.

Actually the problem had been worked around already in lib/symbol. The
work around can therefore by removed now.
[additionally, remove extra spacing from \mapsto, \Mapsto]
This commit is contained in:
Jean-Marc Lasgouttes 2017-01-20 10:32:40 +01:00
parent c9c2179c1f
commit 4a935ed768
2 changed files with 25 additions and 14 deletions
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10
lib/symbols
View File

@ -314,7 +314,7 @@ spadesuit cmsy 127 170 mathord ♠
lyxnot cmsy 54 47 mathrel / hiddensymbol
iffont cmsy
# kerning is slightly imperfect so that one can see when \not is selected
\def\not{\lyxnot\mathrel{\kern-11mu}}
\def\not{\lyxnot}
else
\def\not{\kern4mu\lyxnot\kern-19mu}
endif
@ -991,11 +991,11 @@ bignplus stmry 112 0 mathop x stmaryrd # caution: named hugenpl
\def\varcopyright{\mathord{c\kern-11mu\varbigcirc}} stmaryrd
# kerning is slightly imperfect so that one sees when \[Aa]rrownot is selected
\def\arrownot{\lyxarrownot\mathrel{\kern-11mu}} stmaryrd
\def\Arrownot{\lyxArrownot\mathrel{\kern-10.5mu}} stmaryrd
\def\arrownot{\lyxarrownot} stmaryrd
\def\Arrownot{\lyxArrownot\mathrel{\kern0.5mu}} stmaryrd
\def\longarrownot{\mathrel{\kern5.5mu}\arrownot\mathrel{\kern-5.5mu}} stmaryrd
\def\Longarrownot{\mathrel{\kern5.5mu}\Arrownot\mathrel{\kern-5.5mu}} stmaryrd
\def\Mapsto{\Mapstochar\mathrel{\kern-2mu}\Rightarrow} mathrel ⤇ stmaryrd
\def\Mapsto{\Mapstochar\mathrel\Rightarrow} mathrel ⤇ stmaryrd
\def\mapsfrom{\leftarrow\kern-9mu\mapsfromchar} mathrel ↤ stmaryrd
\def\Mapsfrom{\Leftarrow\kern-9mu\Mapsfromchar} mathrel ⤆ stmaryrd
\def\Longmapsto{\Mapstochar\Longrightarrow} mathrel ⟾ stmaryrd
@ -1174,7 +1174,7 @@ iffont cmsy
\def\Longleftarrow{\Leftarrow\joinrel\Relbar} mathrel ⟸
\def\implies{\Longrightarrow} mathrel ⟹ amsmath
\def\impliedby{\Longleftarrow} mathrel ⟸ amsmath
\def\mapsto{\mapstochar\mathrel{\kern-2mu}\rightarrow} mathrel ↤
\def\mapsto{\mapstochar\rightarrow} mathrel ↤
\def\longmapsto{\mapstochar\joinrel\relbar\joinrel\rightarrow} mathrel ⟻
\def\models{\mathrel{\vert}\joinrel\Relbar} mathrel ⊨
else

29
src/frontends/qt4/GuiFontMetrics.cpp
View File

@ -182,17 +182,28 @@ int GuiFontMetrics::width(docstring const & s) const
int * pw = strwidth_cache_[s];
if (pw)
return *pw;
// For some reason QMetrics::width returns a wrong value with Qt5
// int w = metrics_.width(toqstr(s));
PROFILE_CACHE_MISS(width)
#endif
QTextLayout tl;
tl.setText(toqstr(s));
tl.setFont(font_);
tl.beginLayout();
QTextLine line = tl.createLine();
tl.endLayout();
int w = int(line.naturalTextWidth());
/* For some reason QMetrics::width returns a wrong value with Qt5
* with some arabic text. OTOH, QTextLayout is broken for single
* characters with null width (like \not in mathed).
*/
int w = 0;
if (s.length() == 1
#if QT_VERSION >= 0x040800
|| font_.styleName() == "LyX"
#endif
)
w = metrics_.width(toqstr(s));
else {
QTextLayout tl;
tl.setText(toqstr(s));
tl.setFont(font_);
tl.beginLayout();
QTextLine line = tl.createLine();
tl.endLayout();
w = int(line.naturalTextWidth());
}
#ifdef CACHE_METRICS_WIDTH
strwidth_cache_.insert(s, new int(w), s.size() * sizeof(char_type));
#endif