#include "qt_helpers.h"
-#include "Language.h"
#include "Dimension.h"
+#include "Language.h"
+#include "LyXRC.h"
-#include "support/unicode.h"
+#include "insets/Inset.h"
-using std::string;
+#include "support/lassert.h"
+
+using namespace std;
+using namespace lyx::support;
namespace lyx {
namespace frontend {
-// Caution: When using ucs4_to_qchar() in these methods, this is no
-// real conversion but a simple cast in reality. This is the reason
-// why this works well for symbol fonts used in mathed too, even though
-// these are not real ucs4 characters. These are codepoints in the
-// modern fonts used, nothing unicode related.
-// See comment in QLPainter::text() for more explanation.
-
-GuiFontMetrics::GuiFontMetrics(QFont const & font)
-: metrics_(font), smallcaps_metrics_(font), smallcaps_shape_(false)
+namespace {
+/**
+ * Convert a UCS4 character into a QChar.
+ * This is a hack (it does only make sense for the common part of the UCS4
+ * and UTF16 encodings) and should not be used.
+ * This does only exist because of performance reasons (a real conversion
+ * using iconv is too slow on windows).
+ *
+ * This is no real conversion but a simple cast in reality. This is the reason
+ * why this works well for symbol fonts used in mathed too, even though
+ * these are not real ucs4 characters. These are codepoints in the
+ * computer modern fonts used, nothing unicode related.
+ * See comment in GuiPainter::text() for more explanation.
+ **/
+inline QChar const ucs4_to_qchar(char_type const ucs4)
{
+ LATTEST(is_utf16(ucs4));
+ return QChar(static_cast<unsigned short>(ucs4));
}
+} // anon namespace
-GuiFontMetrics::GuiFontMetrics(QFont const & font, QFont const & smallcaps_font)
-: metrics_(font), smallcaps_metrics_(smallcaps_font), smallcaps_shape_(true)
+// Limit strwidth_cache_ size to 512kB of string data
+GuiFontMetrics::GuiFontMetrics(QFont const & font)
+ : font_(font), metrics_(font, 0),
+ strwidth_cache_(1 << 19),
+ tl_cache_rtl_(false), tl_cache_wordspacing_(-1.0)
{
}
}
+int GuiFontMetrics::em() const
+{
+ return QFontInfo(font_).pixelSize();
+}
+
+
+int GuiFontMetrics::lineWidth() const
+{
+ return metrics_.lineWidth();
+}
+
+
+int GuiFontMetrics::underlinePos() const
+{
+ return metrics_.underlinePos();
+}
+
+
+int GuiFontMetrics::strikeoutPos() const
+{
+ return metrics_.strikeOutPos();
+}
+
+
int GuiFontMetrics::lbearing(char_type c) const
{
if (!is_utf16(c))
- // FIXME: QFontMetrics::leftBearingdoes not support the
+ // FIXME: QFontMetrics::leftBearing does not support the
// full unicode range. Once it does, we could use:
- //return metrics_.leftBearing(toqstr(docstring(1,c)));
+ //return metrics_.leftBearing(toqstr(docstring(1, c)));
return 0;
return metrics_.leftBearing(ucs4_to_qchar(c));
}
-int GuiFontMetrics::rbearing(char_type c) const
-{
- if (!rbearing_cache_.contains(c)) {
- // Qt rbearing is from the right edge of the char's width().
- int rb;
- if (is_utf16(c)) {
- QChar sc = ucs4_to_qchar(c);
- rb = width(c) - metrics_.rightBearing(sc);
- } else
- // FIXME: QFontMetrics::leftBearingdoes not support the
- // full unicode range. Once it does, we could use:
- // metrics_.rightBearing(toqstr(docstring(1,c)));
- rb = width(c);
-
- rbearing_cache_.insert(c, rb);
- }
- return rbearing_cache_.value(c);
+namespace {
+int const outOfLimitMetric = -10000;
}
-int GuiFontMetrics::smallcapsWidth(char_type c) const
+int GuiFontMetrics::rbearing(char_type c) const
{
- // FIXME: Optimisation probably needed: we don't use the width cache.
+ int value = rbearing_cache_.value(c, outOfLimitMetric);
+ if (value != outOfLimitMetric)
+ return value;
+
+ // Qt rbearing is from the right edge of the char's width().
if (is_utf16(c)) {
- QChar const qc = ucs4_to_qchar(c);
- QChar const uc = qc.toUpper();
- if (qc != uc)
- return smallcaps_metrics_.width(uc);
- else
- return metrics_.width(qc);
+ QChar sc = ucs4_to_qchar(c);
+ value = width(c) - metrics_.rightBearing(sc);
} else {
- QString const s = toqstr(docstring(1,c));
- QString const us = s.toUpper();
- if (s != us)
- return smallcaps_metrics_.width(us);
- else
- return metrics_.width(s);
+ // FIXME: QFontMetrics::leftBearing does not support the
+ // full unicode range. Once it does, we could use:
+ // metrics_.rightBearing(toqstr(docstring(1, c)));
+ value = width(c);
}
+
+ rbearing_cache_.insert(c, value);
+
+ return value;
}
int GuiFontMetrics::width(docstring const & s) const
{
- size_t ls = s.size();
- int w = 0;
- for (unsigned int i = 0; i < ls; ++i)
- w += width(s[i]);
-
+ QByteArray qba =
+ QByteArray(reinterpret_cast<char const *>(s.data()),
+ s.size() * sizeof(docstring::value_type));
+ int * pw = strwidth_cache_[qba];
+ if (pw)
+ return *pw;
+ int w = metrics_.width(toqstr(s));
+ strwidth_cache_.insert(qba, new int(w), qba.size());
return w;
}
}
+QTextLayout const &
+GuiFontMetrics::getTextLayout(docstring const & s, QFont font,
+ 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);
+ // 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;
+ }
+ return tl_cache_;
+}
+
+
+int GuiFontMetrics::pos2x(docstring const & s, int const pos, bool const rtl,
+ double const wordspacing) const
+{
+ QFont copy = font_;
+ copy.setWordSpacing(wordspacing);
+ QTextLayout const & tl = getTextLayout(s, font_, rtl, wordspacing);
+ return static_cast<int>(tl.lineForTextPosition(pos).cursorToX(pos));
+}
+
+
+int GuiFontMetrics::x2pos(docstring const & s, int & x, bool const rtl,
+ double const wordspacing) const
+{
+ QTextLayout const & tl = getTextLayout(s, font_, rtl, wordspacing);
+ int pos = tl.lineForTextPosition(0).xToCursor(x);
+ // correct x value to the actual cursor position.
+ x = static_cast<int>(tl.lineForTextPosition(0).cursorToX(pos));
+ return pos;
+}
+
+
+bool GuiFontMetrics::breakAt(docstring & s, int & x, bool const rtl, bool const force) const
+{
+ if (s.empty())
+ return false;
+ QTextLayout tl;
+ tl.setText(toqstr(s));
+ tl.setFont(font_);
+ // Note that both setFlags and the enums are undocumented
+ tl.setFlags(rtl ? Qt::TextForceRightToLeft : Qt::TextForceLeftToRight);
+ QTextOption to;
+ to.setWrapMode(force ? QTextOption::WrapAnywhere : QTextOption::WordWrap);
+ tl.setTextOption(to);
+ tl.beginLayout();
+ QTextLine line = tl.createLine();
+ line.setLineWidth(x);
+ tl.createLine();
+ tl.endLayout();
+ if (int(line.naturalTextWidth()) > x)
+ return false;
+ x = int(line.naturalTextWidth());
+ s = s.substr(0, line.textLength());
+ return true;
+}
+
+
void GuiFontMetrics::rectText(docstring const & str,
int & w, int & ascent, int & descent) const
{
- static int const d = 2;
- w = width(str) + d * 2 + 2;
+ static int const d = Inset::TEXT_TO_INSET_OFFSET / 2;
+
+ w = width(str) + Inset::TEXT_TO_INSET_OFFSET;
ascent = metrics_.ascent() + d;
descent = metrics_.descent() + d;
}
void GuiFontMetrics::buttonText(docstring const & str,
int & w, int & ascent, int & descent) const
{
- static int const d = 3;
- w = width(str) + d * 2 + 2;
- ascent = metrics_.ascent() + d;
- descent = metrics_.descent() + d;
+ rectText(str, w, ascent, descent);
+ w += Inset::TEXT_TO_INSET_OFFSET;
}
}
-void GuiFontMetrics::fillMetricsCache(char_type c) const
+GuiFontMetrics::AscendDescend const GuiFontMetrics::fillMetricsCache(
+ char_type c) const
{
QRect r;
if (is_utf16(c))
r = metrics_.boundingRect(ucs4_to_qchar(c));
else
- r = metrics_.boundingRect(toqstr(docstring(1,c)));
+ r = metrics_.boundingRect(toqstr(docstring(1, c)));
AscendDescend ad = { -r.top(), r.bottom() + 1};
// We could as well compute the width but this is not really
// needed for now as it is done directly in width() below.
metrics_cache_.insert(c, ad);
+
+ return ad;
}
int GuiFontMetrics::width(char_type c) const
{
- if (smallcaps_shape_)
- return smallcapsWidth(c);
+ int value = width_cache_.value(c, outOfLimitMetric);
+ if (value != outOfLimitMetric)
+ return value;
- if (!width_cache_.contains(c)) {
- if (is_utf16(c))
- width_cache_.insert(c, metrics_.width(ucs4_to_qchar(c)));
- else
- width_cache_.insert(c, metrics_.width(toqstr(docstring(1,c))));
- }
+ if (is_utf16(c))
+ value = metrics_.width(ucs4_to_qchar(c));
+ else
+ value = metrics_.width(toqstr(docstring(1, c)));
- return width_cache_.value(c);
+ width_cache_.insert(c, value);
+
+ return value;
}
int GuiFontMetrics::ascent(char_type c) const
{
- if (!metrics_cache_.contains(c))
- fillMetricsCache(c);
-
- return metrics_cache_.value(c).ascent;
+ static AscendDescend const outOfLimitAD =
+ {outOfLimitMetric, outOfLimitMetric};
+ AscendDescend value = metrics_cache_.value(c, outOfLimitAD);
+ if (value.ascent != outOfLimitMetric)
+ return value.ascent;
+
+ value = fillMetricsCache(c);
+ return value.ascent;
}
int GuiFontMetrics::descent(char_type c) const
{
- if (!metrics_cache_.contains(c))
- fillMetricsCache(c);
-
- return metrics_cache_.value(c).descent;
+ static AscendDescend const outOfLimitAD =
+ {outOfLimitMetric, outOfLimitMetric};
+ AscendDescend value = metrics_cache_.value(c, outOfLimitAD);
+ if (value.descent != outOfLimitMetric)
+ return value.descent;
+
+ value = fillMetricsCache(c);
+ return value.descent;
}
-} // frontend
-} // lyx
+} // namespace frontend
+} // namespace lyx
projects / lyx.git / blobdiff