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* QLPainter::text():

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- reorganize the code to minimize indentation by returning early for special cases
- use a pixmap cache for word drawing. This can be disabled by setting USE_PIXMAP_CACHE to 0 at the top of QLPainter.cpp.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@19513 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Abdelrazak Younes 2007-08-13 17:35:09 +00:00
parent 236badeac0
commit c5ed92e7df
1 changed files with 99 additions and 30 deletions
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129
src/frontends/qt4/QLPainter.cpp
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@ -11,8 +11,6 @@
#include <config.h>
#include <QTextLayout>
#include "QLPainter.h"
#include "GuiApplication.h"
@ -28,12 +26,36 @@
#include "support/unicode.h"
#include <QPixmapCache>
#include <QTextLayout>
// Set this to one for enabling the use of a Pixmap cache when drawing
// text. This is especially useful for older PPC/Mac systems.
#define USE_PIXMAP_CACHE 1
using std::endl;
using std::string;
namespace lyx {
namespace frontend {
namespace {
bool const usePixmapCache = USE_PIXMAP_CACHE;
QString generateStringSignature(QString const & str, Font const & f)
{
QString sig = str;
sig.append(QChar(static_cast<short>(f.family())));
sig.append(QChar(static_cast<short>(f.series())));
sig.append(QChar(static_cast<short>(f.realShape())));
sig.append(QChar(static_cast<short>(f.size())));
sig.append(QChar(static_cast<short>(f.color())));
return sig;
}
} // anon namespace
QLPainter::QLPainter(QPaintDevice * device)
: QPainter(device), Painter()
{
@ -243,42 +265,89 @@ int QLPainter::text(int x, int y, docstring const & s,
int textwidth;
if (f.realShape() != Font::SMALLCAPS_SHAPE) {
if (f.realShape() == Font::SMALLCAPS_SHAPE) {
textwidth = smallCapsText(x, y, str, f);
if (f.underbar() == Font::ON)
underline(f, x, y, textwidth);
return textwidth;
}
// Here we use the font width cache instead of
// textwidth = fontMetrics().width(str);
// because the above is awfully expensive on MacOSX
textwidth = fi.metrics->width(s);
if (f.underbar() == Font::ON)
underline(f, x, y, textwidth);
if (!isDrawingEnabled())
return textwidth;
// Qt4 does not display a glyph whose codepoint is the
// same as that of a soft-hyphen (0x00ad), unless it
// occurs at a line-break. As a kludge, we force Qt to
// render this glyph using a one-column line.
if (s.size() == 1 && str[0].unicode() == 0x00ad) {
QTextLayout adsymbol(str);
adsymbol.setFont(fi.font);
adsymbol.beginLayout();
QTextLine line = adsymbol.createLine();
line.setNumColumns(1);
line.setPosition(QPointF(0, -line.ascent()));
adsymbol.endLayout();
line.draw(this, QPointF(x, y));
return textwidth;
}
if (!usePixmapCache) {
// don't use the pixmap cache,
// draw directly onto the painting device
setQPainterPen(f.realColor());
if (font() != fi.font)
setFont(fi.font);
// We need to draw the text as LTR as we use our own bidi code.
setLayoutDirection(Qt::LeftToRight);
if (isDrawingEnabled()) {
LYXERR(Debug::PAINTING) << "draw " << std::string(str.toUtf8())
<< " at " << x << "," << y << std::endl;
// Qt4 does not display a glyph whose codepoint is the
// same as that of a soft-hyphen (0x00ad), unless it
// occurs at a line-break. As a kludge, we force Qt to
// render this glyph using a one-column line.
if (s.size() == 1 && str[0].unicode() == 0x00ad) {
QTextLayout adsymbol(str);
adsymbol.setFont(fi.font);
adsymbol.beginLayout();
QTextLine line = adsymbol.createLine();
line.setNumColumns(1);
line.setPosition(QPointF(0, -line.ascent()));
adsymbol.endLayout();
line.draw(this, QPointF(x, y));
} else
drawText(x, y, str);
}
// Here we use the font width cache instead of
// textwidth = fontMetrics().width(str);
// because the above is awfully expensive on MacOSX
textwidth = fi.metrics->width(str);
} else {
textwidth = smallCapsText(x, y, str, f);
// We need to draw the text as LTR as we use our own bidi code.
setLayoutDirection(Qt::LeftToRight);
drawText(x, y, str);
LYXERR(Debug::PAINTING) << "draw " << std::string(str.toUtf8())
<< " at " << x << "," << y << std::endl;
return textwidth;
}
if (f.underbar() == Font::ON) {
underline(f, x, y, textwidth);
QPixmap pm;
QString key = generateStringSignature(str, f);
// Warning: Left bearing is in general negative! Only the case
// where left bearing is negative is of interest WRT the the
// pixmap width and the text x-position.
// Only the left bearing of the first character is important
// as we always write from left to right, even for
// right-to-left languages.
int const lb = std::min(fi.metrics->lbearing(s[0]), 0);
int const mA = fi.metrics->maxAscent();
if (!QPixmapCache::find(key, pm)) {
// Only the right bearing of the last character is
// important as we always write from left to right,
// even for right-to-left languages.
int const rb = fi.metrics->rbearing(s[s.size()-1]);
int const w = textwidth + rb - lb;
int const mD = fi.metrics->maxDescent();
int const h = mA + mD;
pm = QPixmap(w, h);
pm.fill(Qt::transparent);
QLPainter p(&pm);
p.setQPainterPen(f.realColor());
if (p.font() != fi.font)
p.setFont(fi.font);
// We need to draw the text as LTR as we use our own bidi code.
p.setLayoutDirection(Qt::LeftToRight);
p.drawText(-lb, mA, str);
QPixmapCache::insert(key, pm);
LYXERR(Debug::PAINTING) << "h=" << h << " mA=" << mA << " mD=" << mD
<< " w=" << w << " lb=" << lb << " tw=" << textwidth
<< " rb=" << rb << endl;
}
// Draw the cached pixmap.
drawPixmap(x + lb, y - mA, pm);
return textwidth;
}