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* complete fix for #5327: switch back to normal drawing code if the cache

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pixmap would have non-positive width or height.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@27091 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Stefan Schimanski 2008-10-24 22:49:17 +00:00
parent 2a69828508
commit d51c31ca85
1 changed files with 41 additions and 42 deletions
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83
src/frontends/qt4/GuiPainter.cpp
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@ -366,31 +366,24 @@ int GuiPainter::text(int x, int y, docstring const & s,
return textwidth;
}
if (!use_pixmap_cache_) {
// don't use the pixmap cache,
// draw directly onto the painting device
setQPainterPen(computeColor(f.realColor()));
if (font() != ff)
setFont(ff);
// We need to draw the text as LTR as we use our own bidi code.
QPainter::setLayoutDirection(Qt::LeftToRight);
drawText(x, y, str);
//LYXERR(Debug::PAINTING, "draw " << string(str.toUtf8())
// << " at " << x << "," << y);
return textwidth;
}
if (use_pixmap_cache_) {
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
// 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 = min(fm.lbearing(s[0]), 0);
int const mA = fm.maxAscent();
if (QPixmapCache::find(key, pm)) {
// Draw the cached pixmap.
drawPixmap(x + lb, y - mA, pm);
return 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 = min(fm.lbearing(s[0]), 0);
int const mA = fm.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.
@ -398,28 +391,34 @@ int GuiPainter::text(int x, int y, docstring const & s,
int const w = textwidth + rb - lb;
int const mD = fm.maxDescent();
int const h = mA + mD;
if (w <= 0 || h <= 0) {
LYXERR(Debug::PAINTING, "Invalid pixmap cache image for '" << s << "' h=" << h << " w=" << w);
if (w > 0 && h > 0) {
pm = QPixmap(w, h);
pm.fill(Qt::transparent);
GuiPainter p(&pm);
p.setQPainterPen(computeColor(f.realColor()));
if (p.font() != ff)
p.setFont(ff);
// 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);
return textwidth;
}
pm = QPixmap(w, h);
pm.fill(Qt::transparent);
GuiPainter p(&pm);
p.setQPainterPen(computeColor(f.realColor()));
if (p.font() != ff)
p.setFont(ff);
// 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);
}
// Draw the cached pixmap.
drawPixmap(x + lb, y - mA, pm);
// don't use the pixmap cache,
// draw directly onto the painting device
setQPainterPen(computeColor(f.realColor()));
if (font() != ff)
setFont(ff);
// We need to draw the text as LTR as we use our own bidi code.
QPainter::setLayoutDirection(Qt::LeftToRight);
drawText(x, y, str);
//LYXERR(Debug::PAINTING, "draw " << string(str.toUtf8())
// << " at " << x << "," << y);
return textwidth;
}