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Optimisation: don't search twice the hash tables.

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git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@19501 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Abdelrazak Younes 2007-08-13 13:56:54 +00:00
parent bc0a64efc3
commit 484dd46b35
2 changed files with 51 additions and 29 deletions
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64
src/frontends/qt4/GuiFontMetrics.cpp
View File

@ -70,23 +70,30 @@ int GuiFontMetrics::lbearing(char_type c) const
}
namespace {
int const outOfLimitMetric = -10000;
}
int GuiFontMetrics::rbearing(char_type c) const
{
if (!rbearing_cache_.contains(c)) {
int value = rbearing_cache_.value(c, outOfLimitMetric);
if (value != outOfLimitMetric)
return value;
// 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);
value = 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);
value = width(c);
rbearing_cache_.insert(c, rb);
}
return rbearing_cache_.value(c);
rbearing_cache_.insert(c, value);
return value;
}
@ -173,7 +180,8 @@ Dimension const GuiFontMetrics::dimension(char_type c) const
}
void GuiFontMetrics::fillMetricsCache(char_type c) const
GuiFontMetrics::AscendDescend const GuiFontMetrics::fillMetricsCache(
char_type c) const
{
QRect r;
if (is_utf16(c))
@ -185,6 +193,8 @@ void GuiFontMetrics::fillMetricsCache(char_type c) const
// 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;
}
@ -193,32 +203,44 @@ int GuiFontMetrics::width(char_type c) const
if (smallcaps_shape_)
return smallcapsWidth(c);
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))));
}
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);
static AscendDescend const outOfLimitAD =
{outOfLimitMetric, outOfLimitMetric};
AscendDescend value = metrics_cache_.value(c, outOfLimitAD);
if (value.ascent != outOfLimitMetric)
return value.ascent;
return metrics_cache_.value(c).ascent;
value = fillMetricsCache(c);
return value.ascent;
}
int GuiFontMetrics::descent(char_type c) const
{
if (!metrics_cache_.contains(c))
fillMetricsCache(c);
static AscendDescend const outOfLimitAD =
{outOfLimitMetric, outOfLimitMetric};
AscendDescend value = metrics_cache_.value(c, outOfLimitAD);
if (value.descent != outOfLimitMetric)
return value.descent;
return metrics_cache_.value(c).descent;
value = fillMetricsCache(c);
return value.descent;
}
} // frontend

2
src/frontends/qt4/GuiFontMetrics.h
View File

@ -74,7 +74,7 @@ private:
/// Cache of char ascends and descends
mutable QHash<char_type, AscendDescend> metrics_cache_;
/// fill in \c metrics_cache_ at specified value.
void fillMetricsCache(char_type) const;
AscendDescend const fillMetricsCache(char_type) const;
/// Cache of char right bearings
mutable QHash<char_type, int> rbearing_cache_;