#include "insets/Inset.h"
+#include "support/convert.h"
#include "support/lassert.h"
+#ifdef CACHE_SOME_METRICS
+#include <QByteArray>
+#endif
+
using namespace std;
using namespace lyx::support;
+#ifdef CACHE_SOME_METRICS
+namespace std {
+
+/*
+ * Argument-dependent lookup implies that this function shall be
+ * declared in the namespace of its argument. But this is std
+ * namespace, since lyx::docstring is just std::basic_string<wchar_t>.
+ */
+uint qHash(lyx::docstring const & s)
+{
+ return qHash(QByteArray(reinterpret_cast<char const *>(s.data()),
+ s.size() * sizeof(lyx::docstring::value_type)));
+}
+
+}
+#endif
+
namespace lyx {
namespace frontend {
} // anon namespace
-// Limit strwidth_cache_ size to 512kB of string data
+/*
+ * Limit (strwidth|breakat)_cache_ size to 512kB of string data.
+ * Limit qtextlayout_cache_ size to 500 elements (we do not know the
+ * size of the QTextLayout objects anyway).
+ * Note that all these numbers are arbitrary.
+ */
GuiFontMetrics::GuiFontMetrics(QFont const & font)
- : font_(font), metrics_(font, 0),
- strwidth_cache_(1 << 19),
- tl_cache_rtl_(false), tl_cache_wordspacing_(-1.0)
+ : font_(font), metrics_(font, 0)
+#ifdef CACHE_METRICS_WIDTH
+ , strwidth_cache_(1 << 19)
+#endif
+#ifdef CACHE_METRICS_BREAKAT
+ , breakat_cache_(1 << 19)
+#endif
+#ifdef CACHE_METRICS_QTEXTLAYOUT
+ , qtextlayout_cache_(500)
+#endif
{
}
int GuiFontMetrics::width(docstring const & s) const
{
- QByteArray qba =
- QByteArray(reinterpret_cast<char const *>(s.data()),
- s.size() * sizeof(docstring::value_type));
- int * pw = strwidth_cache_[qba];
+#ifdef CACHE_METRICS_WIDTH
+ 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));
+#endif
QTextLayout tl;
tl.setText(toqstr(s));
tl.setFont(font_);
QTextLine line = tl.createLine();
tl.endLayout();
int w = int(line.naturalTextWidth());
-
- strwidth_cache_.insert(qba, new int(w), qba.size());
+#ifdef CACHE_METRICS_WIDTH
+ strwidth_cache_.insert(s, new int(w), s.size() * sizeof(char_type));
+#endif
return w;
}
}
-QTextLayout const &
-GuiFontMetrics::getTextLayout(docstring const & s, QFont font,
- bool const rtl, double const wordspacing) const
+QTextLayout const *
+GuiFontMetrics::getTextLayout(docstring const & s, bool const rtl,
+ double const wordspacing) const
{
- if (s != tl_cache_s_ || font != tl_cache_font_ || rtl != tl_cache_rtl_
- || wordspacing != tl_cache_wordspacing_) {
- tl_cache_.setText(toqstr(s));
- font.setWordSpacing(wordspacing);
- tl_cache_.setFont(font);
+ QTextLayout * ptl;
+#ifdef CACHE_METRICS_QTEXTLAYOUT
+ docstring const s_cache = s + (rtl ? "r" : "l") + convert<docstring>(wordspacing);
+ ptl = qtextlayout_cache_[s_cache];
+ if (!ptl) {
+#endif
+ ptl = new QTextLayout();
+ ptl->setCacheEnabled(true);
+ ptl->setText(toqstr(s));
+ QFont copy = font_;
+ copy.setWordSpacing(wordspacing);
+ ptl->setFont(copy);
// Note that both setFlags and the enums are undocumented
- tl_cache_.setFlags(rtl ? Qt::TextForceRightToLeft : Qt::TextForceLeftToRight);
- tl_cache_.beginLayout();
- tl_cache_.createLine();
- tl_cache_.endLayout();
- tl_cache_s_ = s;
- tl_cache_font_ = font;
- tl_cache_rtl_ = rtl;
- tl_cache_wordspacing_ = wordspacing;
+ ptl->setFlags(rtl ? Qt::TextForceRightToLeft : Qt::TextForceLeftToRight);
+ ptl->beginLayout();
+ ptl->createLine();
+ ptl->endLayout();
+#ifdef CACHE_METRICS_QTEXTLAYOUT
+ qtextlayout_cache_.insert(s_cache, ptl);
}
- return tl_cache_;
+#endif
+ return ptl;
}
-int GuiFontMetrics::pos2x(docstring const & s, int const pos, bool const rtl,
+int GuiFontMetrics::pos2x(docstring const & s, int pos, bool const rtl,
double const wordspacing) const
{
- QTextLayout const & tl = getTextLayout(s, font_, rtl, wordspacing);
+ if (pos <= 0)
+ pos = 0;
+ QTextLayout const * tl = getTextLayout(s, rtl, wordspacing);
/* Since QString is UTF-16 and docstring is UCS-4, the offsets may
* not be the same when there are high-plan unicode characters
* (bug #10443).
*/
int const qpos = toqstr(s.substr(0, pos)).length();
- return static_cast<int>(tl.lineForTextPosition(qpos).cursorToX(qpos));
+ return static_cast<int>(tl->lineForTextPosition(qpos).cursorToX(qpos));
}
int GuiFontMetrics::x2pos(docstring const & s, int & x, bool const rtl,
double const wordspacing) const
{
- QTextLayout const & tl = getTextLayout(s, font_, rtl, wordspacing);
- int const qpos = tl.lineForTextPosition(0).xToCursor(x);
+ QTextLayout const * tl = getTextLayout(s, rtl, wordspacing);
+ int const qpos = tl->lineForTextPosition(0).xToCursor(x);
// correct x value to the actual cursor position.
- x = static_cast<int>(tl.lineForTextPosition(0).cursorToX(qpos));
+ x = static_cast<int>(tl->lineForTextPosition(0).cursorToX(qpos));
/* Since QString is UTF-16 and docstring is UCS-4, the offsets may
* not be the same when there are high-plan unicode characters
* (bug #10443).
*/
#if QT_VERSION < 0x040801 || QT_VERSION >= 0x050100
- return qstring_to_ucs4(tl.text().left(qpos)).length();
+ return qstring_to_ucs4(tl->text().left(qpos)).length();
#else
/* Due to QTBUG-25536 in 4.8.1 <= Qt < 5.1.0, the string returned
- * by QString::toUcs4 (used by qstring_to_ucs4)may have wrong
+ * by QString::toUcs4 (used by qstring_to_ucs4) may have wrong
* length. We work around the problem by trying all docstring
* positions until the right one is found. This is slow only if
* there are many high-plane Unicode characters. It might be
}
-bool GuiFontMetrics::breakAt(docstring & s, int & x, bool const rtl, bool const force) const
+
+pair<int, int> *
+GuiFontMetrics::breakAt_helper(docstring const & s, int const x,
+ bool const rtl, bool const force) const
{
- if (s.empty())
- return false;
QTextLayout tl;
/* Qt will not break at a leading or trailing space, and we need
* that sometimes, see http://www.lyx.org/trac/ticket/9921.
* To work around the problem, we enclose the string between
* zero-width characters so that the QTextLayout algorithm will
* agree to break the text at these extremal spaces.
- */
+ */
// Unicode character ZERO WIDTH NO-BREAK SPACE
QChar const zerow_nbsp(0xfeff);
QString qs = zerow_nbsp + toqstr(s) + zerow_nbsp;
tl.createLine();
tl.endLayout();
if ((force && line.textLength() == offset) || int(line.naturalTextWidth()) > x)
- return false;
- x = int(line.naturalTextWidth());
+ return new pair<int, int>(-1, -1);
/* Since QString is UTF-16 and docstring is UCS-4, the offsets may
* not be the same when there are high-plan unicode characters
* (bug #10443).
// The ending character zerow_nbsp has to be ignored if the line is complete.
int const qlen = line.textLength() - offset - (line.textLength() == qs.length());
#if QT_VERSION < 0x040801 || QT_VERSION >= 0x050100
- s = qstring_to_ucs4(qs.mid(offset, qlen));
+ int len = qstring_to_ucs4(qs.mid(offset, qlen)).length();
#else
/* Due to QTBUG-25536 in 4.8.1 <= Qt < 5.1.0, the string returned
- * by QString::toUcs4 (used by qstring_to_ucs4)may have wrong
+ * by QString::toUcs4 (used by qstring_to_ucs4) may have wrong
* length. We work around the problem by trying all docstring
* positions until the right one is found. This is slow only if
* there are many high-plane Unicode characters. It might be
while (len >= 0 && toqstr(s.substr(0, len)).length() != qlen)
--len;
LASSERT(len > 0 || qlen == 0, /**/);
- s = s.substr(0, len);
+#endif
+ // The -1 is here to account for the leading zerow_nbsp.
+ return new pair<int, int>(len, int(line.naturalTextWidth()));
+}
+
+
+bool GuiFontMetrics::breakAt(docstring & s, int & x, bool const rtl, bool const force) const
+{
+ if (s.empty())
+ return false;
+ pair<int, int> * pp;
+#ifdef CACHE_METRICS_BREAKAT
+ docstring const s_cache = s + convert<docstring>(x) + (rtl ? "r" : "l") + (force ? "f" : "w");
+
+ pp = breakat_cache_[s_cache];
+ if (!pp) {
+#endif
+ pp = breakAt_helper(s, x, rtl, force);
+#ifdef CACHE_METRICS_BREAKAT
+ breakat_cache_.insert(s_cache, pp, s_cache.size() * sizeof(char_type));
+ }
+#endif
+ if (pp->first == -1)
+ return false;
+ s = s.substr(0, pp->first);
+ x = pp->second;
+#ifndef CACHE_METRICS_BREAKAT
+ delete pp;
#endif
return true;
}
}
-
void GuiFontMetrics::buttonText(docstring const & str,
int & w, int & ascent, int & descent) const
{
#include "support/docstring.h"
-#include <QByteArray>
-#include <QCache>
#include <QFont>
#include <QFontMetrics>
#include <QHash>
#include <QTextLayout>
+// Declare which font metrics elements have to be cached
+
+#define CACHE_METRICS_WIDTH
+#define CACHE_METRICS_BREAKAT
+// Qt 5.x already has its own caching of QTextLayout objects
+#if (QT_VERSION < 0x050000)
+#define CACHE_METRICS_QTEXTLAYOUT
+#endif
+
+#if defined(CACHE_METRICS_WIDTH) || defined(CACHE_METRICS_BREAKAT) \
+ || defined(CACHE_METRICS_QTEXTLAYOUT)
+#define CACHE_SOME_METRICS
+#endif
+
+#ifdef CACHE_SOME_METRICS
+#include <QCache>
+#endif
+
namespace lyx {
namespace frontend {
///
int width(QString const & str) const;
+ /// Return a pointer to a cached QTextLayout object
+ QTextLayout const *
+ getTextLayout(docstring const & s, bool const rtl,
+ double const wordspacing) const;
+
private:
- QTextLayout const &
- getTextLayout(docstring const & s, QFont font,
- bool const rtl, double const wordspacing) const;
+ std::pair<int, int> *
+ breakAt_helper(docstring const & s, int const x,
+ bool const rtl, bool const force) const;
/// The font
QFont font_;
/// Cache of char widths
mutable QHash<char_type, int> width_cache_;
+#ifdef CACHE_METRICS_WIDTH
/// Cache of string widths
- mutable QCache<QByteArray, int> strwidth_cache_;
+ mutable QCache<docstring, int> strwidth_cache_;
+#endif
+
+#ifdef CACHE_METRICS_BREAKAT
+ /// Cache for breakAt
+ mutable QCache<docstring, std::pair<int, int>> breakat_cache_;
+#endif
+
+#ifdef CACHE_METRICS_QTEXTLAYOUT
+ /// Cache for QTextLayout:s
+ mutable QCache<docstring, QTextLayout> qtextlayout_cache_;
+#endif
struct AscendDescend {
int ascent;
/// Cache of char right bearings
mutable QHash<char_type, int> rbearing_cache_;
- // A trivial QTextLayout cache
- mutable QTextLayout tl_cache_;
- mutable docstring tl_cache_s_;
- mutable QFont tl_cache_font_;
- mutable bool tl_cache_rtl_;
- mutable double tl_cache_wordspacing_;
-
};
} // namespace frontend
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