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(almost) Fix Qt4 support

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When is it detected that our zero-width characters are not really
zero-width, avoid to use them altogether. Currently, this is known to
happen in Qt4 with monospace fonts.

This allow to remove the special Qt4 code in breaskString_helper.

Related to bug #10117.
This commit is contained in:
Jean-Marc Lasgouttes 2022-11-10 17:24:56 +01:00
parent 23cd38bc1c
commit 50e1bdf320
2 changed files with 14 additions and 21 deletions
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31
src/frontends/qt/GuiFontMetrics.cpp
View File

@ -146,6 +146,11 @@ GuiFontMetrics::GuiFontMetrics(QFont const & font)
slope_ = defaultSlope;
LYXERR(Debug::FONT, "Italic slope: " << slope_);
}
// If those characters have a non-zero width, we need to avoid them.
// This happens with Qt4 with monospace fonts
needs_naked_ = width(QString() + QChar(0x2060) + QChar(0x202d) + QChar(0x202e)) > 0;
// if (needs_naked_)
// LYXERR0("Font " << font.family() << " needs naked text layouts!");
}
@ -349,6 +354,7 @@ struct TextLayoutHelper
/// \c s is the original string
/// \c isrtl is true if the string is right-to-left
/// \c naked is true to disable the insertion of zero width annotations
/// FIXME: remove \c naked argument when Qt4 support goes away.
TextLayoutHelper(docstring const & s, bool isrtl, bool naked = false);
/// translate QString index to docstring index
@ -481,7 +487,7 @@ GuiFontMetrics::getTextLayout(docstring const & s, bool const rtl,
if (auto ptl = qtextlayout_cache_[key])
return ptl;
PROFILE_CACHE_MISS(getTextLayout);
TextLayoutHelper tlh(s, rtl);
TextLayoutHelper tlh(s, rtl, needs_naked_);
auto const ptl = getTextLayout_helper(tlh, wordspacing, font_);
qtextlayout_cache_.insert(key, ptl);
return ptl;
@ -491,7 +497,7 @@ GuiFontMetrics::getTextLayout(docstring const & s, bool const rtl,
int GuiFontMetrics::pos2x(docstring const & s, int pos, bool const rtl,
double const wordspacing) const
{
TextLayoutHelper tlh(s, rtl);
TextLayoutHelper tlh(s, rtl, needs_naked_);
auto ptl = getTextLayout(tlh, wordspacing);
// pos can be negative, see #10506.
int const qpos = tlh.pos2qpos(max(pos, 0));
@ -502,7 +508,7 @@ int GuiFontMetrics::pos2x(docstring const & s, int pos, bool const rtl,
int GuiFontMetrics::x2pos(docstring const & s, int & x, bool const rtl,
double const wordspacing) const
{
TextLayoutHelper tlh(s, rtl);
TextLayoutHelper tlh(s, rtl, needs_naked_);
auto ptl = getTextLayout(tlh, wordspacing);
QTextLine const & tline = ptl->lineForTextPosition(0);
int qpos = tline.xToCursor(x);
@ -540,7 +546,7 @@ FontMetrics::Breaks
GuiFontMetrics::breakString_helper(docstring const & s, int first_wid, int wid,
bool rtl, bool force) const
{
TextLayoutHelper const tlh(s, rtl);
TextLayoutHelper const tlh(s, rtl, needs_naked_);
QTextLayout tl;
#ifdef BIDI_USE_FLAG
@ -582,7 +588,6 @@ GuiFontMetrics::breakString_helper(docstring const & s, int first_wid, int wid,
QTextLine const & line = tl.lineAt(i);
int const line_epos = line.textStart() + line.textLength();
int const epos = tlh.qpos2pos(line_epos);
#if QT_VERSION >= 0x050000
// This does not take trailing spaces into account, except for the last line.
int const wid = iround(line.naturalTextWidth());
// If the line is not the last one, trailing space is always omitted.
@ -591,24 +596,8 @@ GuiFontMetrics::breakString_helper(docstring const & s, int first_wid, int wid,
if (i + 1 == tl.lineCount() && !s.empty() && isSpace(s.back())
&& line.textStart() <= tlh.pos2qpos(s.size() - 1))
nspc_wid = iround(line.cursorToX(tlh.pos2qpos(s.size() - 1)));
#else
// With some monospace fonts, the value of horizontalAdvance()
// can be wrong with Qt4. One hypothesis is that the invisible
// characters that we use are given a non-null width.
// FIXME: this is slower than it could be but we'll get rid of Qt4 anyway
docstring ss = s.substr(pos, epos - pos);
int const wid = width(ss);
if (!ss.empty() && isSpace(ss.back()))
ss.pop_back();
int const nspc_wid = i + 1 < tl.lineCount() ? width(ss) : wid;
#endif
breaks.emplace_back(epos - pos, wid, nspc_wid);
pos = epos;
#if 0
// FIXME: should it be kept in some form?
if ((force && line.textLength() == brkStrOffset) || line_wid > x)
return {-1, line_wid};
#endif
}
return breaks;

4
src/frontends/qt/GuiFontMetrics.h
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@ -119,6 +119,10 @@ private:
/// Slope of italic font
double slope_;
/// If true, avoid extra annotation in string for QTextLayout
// FIXME: remove wen Qt4 suport goes away
bool needs_naked_ = false;
/// Cache of char widths
mutable QHash<char_type, int> width_cache_;
/// Cache of string widths