#include "Language.h"
#include "Dimension.h"
-#include "support/unicode.h"
+#include "insets/Inset.h"
-using std::string;
+#include "support/lassert.h"
+
+using namespace std;
namespace lyx {
namespace frontend {
+/**
+ * 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).
+ */
+static inline QChar const ucs4_to_qchar(char_type const ucs4)
+{
+ LASSERT(is_utf16(ucs4), /**/);
+ return QChar(static_cast<unsigned short>(ucs4));
+}
+
+
+// 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)
{
int GuiFontMetrics::lbearing(char_type c) const
{
+ if (!is_utf16(c))
+ // FIXME: QFontMetrics::leftBearingdoes not support the
+ // full unicode range. Once it does, we could use:
+ //return metrics_.leftBearing(toqstr(docstring(1, c)));
+ return 0;
+
return metrics_.leftBearing(ucs4_to_qchar(c));
}
+namespace {
+int const outOfLimitMetric = -10000;
+}
+
+
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 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 sc = ucs4_to_qchar(c);
- int rb = metrics_.width(sc) - metrics_.rightBearing(sc);
- rbearing_cache_.insert(c, rb);
+ value = width(c) - metrics_.rightBearing(sc);
+ } else {
+ // 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);
}
- return rbearing_cache_.value(c);
+
+ rbearing_cache_.insert(c, value);
+
+ return value;
}
-int GuiFontMetrics::smallcapsWidth(QString const & s) const
+int GuiFontMetrics::smallcapsWidth(char_type c) const
{
- int w = 0;
- int const ls = s.size();
-
- for (int i = 0; i < ls; ++i) {
- QChar const & c = s[i];
- QChar const uc = c.toUpper();
- if (c != uc)
- w += smallcaps_metrics_.width(uc);
+ // FIXME: Optimisation probably needed: we don't use the width cache.
+ 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
- w += metrics_.width(c);
+ return metrics_.width(qc);
+ } 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);
}
- return w;
}
int GuiFontMetrics::width(docstring const & s) const
{
size_t ls = s.size();
- if (ls == 0)
- return 0;
-
- if (ls == 1 && !smallcaps_shape_) {
- return width(s[0]);
- }
-
- if (smallcaps_shape_)
- // Caution: The following ucs4 to QString conversions work
- // for symbol fonts only because they are no real conversions
- // but simple casts in reality. See comment in QLPainter::text()
- // for more explanation.
- return smallcapsWidth(toqstr(s));
-
int w = 0;
- for (unsigned int i = 0; i < ls; ++i)
+ for (unsigned int i = 0; i < ls; ++i) {
+ //FIXME: we need to detect surrogate pairs and act accordingly
+ /**
+ if isSurrogateBase(s[i]) {
+ docstring c = s[i];
+ if (smallcaps_shape_)
+ w += metrics_.width(toqstr(c + s[i + 1]));
+ else
+ w += smallcaps_metrics_.width(toqstr(c + s[i + 1]));
+ ++i;
+ }
+ else
+ */
w += width(s[i]);
+ }
return w;
}
int GuiFontMetrics::width(QString const & ucs2) const
{
- int const ls = ucs2.size();
- if (ls == 1 && !smallcaps_shape_) {
- return width(ucs2[0].unicode());
- }
-
- if (smallcaps_shape_)
- return smallcapsWidth(ucs2);
-
- int w = 0;
- for (int i = 0; i < ls; ++i)
- w += width(ucs2[i].unicode());
-
- return w;
+ return width(qstring_to_ucs4(ucs2));
}
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 const & r = metrics_.boundingRect(ucs4_to_qchar(c));
+ QRect r;
+ if (is_utf16(c))
+ r = metrics_.boundingRect(ucs4_to_qchar(c));
+ else
+ 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(ucs4_to_qchar(c));
+ return smallcapsWidth(c);
- if (!width_cache_.contains(c)) {
- width_cache_.insert(c, metrics_.width(ucs4_to_qchar(c)));
- }
+ int value = width_cache_.value(c, outOfLimitMetric);
+ if (value != outOfLimitMetric)
+ return value;
- return width_cache_.value(c);
+ if (is_utf16(c))
+ value = metrics_.width(ucs4_to_qchar(c));
+ else
+ value = metrics_.width(toqstr(docstring(1, 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