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Do the actual drawing in the paint event

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Historically, because of two-stage drawing, LyX has been painting on a
Pixmap, and this pixmap is copied to screen at paint event time.

Now that we have three-stage drawing, it is possible to delay the
painting to actual paint event and avoid the intermediate Pixmap.

Known bug: the cursor is never erased.
This commit is contained in:
Jean-Marc Lasgouttes 2017-09-08 16:55:11 +02:00
parent d222e0f48e
commit 7b8b3e38a1
2 changed files with 17 additions and 67 deletions
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55
src/frontends/qt4/GuiWorkArea.cpp
View File

@ -246,7 +246,7 @@ SyntheticMouseEvent::SyntheticMouseEvent()
GuiWorkArea::Private::Private(GuiWorkArea * parent)
: p(parent), screen_(0), buffer_view_(0), lyx_view_(0),
: p(parent), buffer_view_(0), lyx_view_(0),
cursor_visible_(false), cursor_(0),
need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
pixel_ratio_(1.0),
@ -299,7 +299,6 @@ void GuiWorkArea::init()
d->cursor_timeout_.setInterval(500);
}
d->resetScreen();
// With Qt4.5 a mouse event will happen before the first paint event
// so make sure that the buffer view has an up to date metrics.
d->buffer_view_->resize(viewport()->width(), viewport()->height());
@ -313,10 +312,11 @@ void GuiWorkArea::init()
setFrameStyle(QFrame::NoFrame);
updateWindowTitle();
viewport()->setAutoFillBackground(false);
//viewport()->setAutoFillBackground(false);
// We don't need double-buffering nor SystemBackground on
// the viewport because we have our own backing pixmap.
viewport()->setAttribute(Qt::WA_NoSystemBackground);
//viewport()->setAttribute(Qt::WA_NoSystemBackground);
viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
setFocusPolicy(Qt::StrongFocus);
@ -344,7 +344,6 @@ GuiWorkArea::~GuiWorkArea()
try {
d->buffer_view_->buffer().workAreaManager().remove(this);
} catch(...) {}
delete d->screen_;
delete d->buffer_view_;
delete d->cursor_;
// Completer has a QObject parent and is thus automatically destroyed.
@ -491,8 +490,7 @@ void GuiWorkArea::redraw(bool update_metrics)
}
LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
d->updateScreen();
update(0, 0, viewport()->width(), viewport()->height());
viewport()->update();
/// \warning: scrollbar updating *must* be done after the BufferView is drawn
/// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
@ -591,7 +589,7 @@ void GuiWorkArea::Private::resizeBufferView()
buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
if (cursor_in_view)
buffer_view_->scrollToCursor();
updateScreen();
p->viewport()->update();
// Update scrollbars which might have changed due different
// BufferView dimension. This is especially important when the
@ -1176,20 +1174,12 @@ void GuiWorkArea::resizeEvent(QResizeEvent * ev)
}
void GuiWorkArea::Private::update(int x, int y, int w, int h)
{
p->viewport()->update(x, y, w, h);
}
void GuiWorkArea::paintEvent(QPaintEvent * ev)
{
QRectF const rc = ev->rect();
// LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
// << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
if (d->needResize()) {
d->resetScreen();
d->resizeBufferView();
if (d->cursor_visible_) {
d->hideCursor();
@ -1197,29 +1187,14 @@ void GuiWorkArea::paintEvent(QPaintEvent * ev)
}
}
QPainter pain(viewport());
double const pr = pixelRatio();
QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
GuiPainter pain(viewport(), pixelRatio());
d->buffer_view_->draw(pain);
if (lyxrc.use_qimage) {
QImage const & image = static_cast<QImage const &>(*d->screen_);
pain.drawImage(rc, image, rcs);
} else {
QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
pain.drawPixmap(rc, pixmap, rcs);
}
d->cursor_->draw(pain);
ev->accept();
}
void GuiWorkArea::Private::updateScreen()
{
GuiPainter pain(screen_, p->pixelRatio());
buffer_view_->draw(pain);
}
void GuiWorkArea::Private::showCursor(int x, int y, int h,
bool l_shape, bool rtl, bool completable)
{
@ -1229,9 +1204,8 @@ void GuiWorkArea::Private::showCursor(int x, int y, int h,
// We can't use redraw() here because this would trigger a infinite
// recursive loop with showCursor().
buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
updateScreen();
p->viewport()->update();
updateScrollbar();
p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
schedule_redraw_ = false;
// Show the cursor immediately after the update.
hideCursor();
@ -1255,6 +1229,10 @@ void GuiWorkArea::Private::removeCursor()
void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
{
//FIXME Broken Feature !!
// I do not think that we are supposed to paint inside this event. Shall we
// just let TextMetrics::breakRow add this to the relevant Row object?
#if 0
QString const & commit_string = e->commitString();
docstring const & preedit_string
= qstring_to_ucs4(e->preeditString());
@ -1290,7 +1268,7 @@ void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
}
d->buffer_view_->updateMetrics();
d->updateScreen();
viewport()->update();
// FIXME: shall we use real_current_font here? (see #10478)
FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
FontMetrics const & fm = theFontMetrics(font);
@ -1299,7 +1277,7 @@ void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
int cur_y = d->cursor_->rect().bottom();
// redraw area of preedit string.
update(0, cur_y - height, viewport()->width(),
viewport()->update(0, cur_y - height, viewport()->width(),
(height + 1) * d->preedit_lines_);
if (preedit_string.empty()) {
@ -1387,8 +1365,9 @@ void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
}
// update the preedit string screen area.
update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
viewport()->update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
(height + 1) * d->preedit_lines_);
#endif
// Don't forget to accept the event!
e->accept();

29
src/frontends/qt4/GuiWorkArea_Private.h
View File

@ -92,10 +92,6 @@ struct GuiWorkArea::Private
{
Private(GuiWorkArea *);
/// update the passed area.
void update(int x, int y, int w, int h);
///
void updateScreen();
///
void resizeBufferView();
@ -123,34 +119,9 @@ struct GuiWorkArea::Private
return need_resize_ || p->pixelRatio() != pixel_ratio_;
}
void resetScreen()
{
delete screen_;
pixel_ratio_ = p->pixelRatio();
if (lyxrc.use_qimage) {
QImage *x =
new QImage(static_cast<int>(pixel_ratio_ * p->viewport()->width()),
static_cast<int>(pixel_ratio_ * p->viewport()->height()),
QImage::Format_ARGB32_Premultiplied);
#if QT_VERSION >= 0x050000
x->setDevicePixelRatio(pixel_ratio_);
#endif
screen_ = x;
} else {
QPixmap *x =
new QPixmap(static_cast<int>(pixel_ratio_ * p->viewport()->width()),
static_cast<int>(pixel_ratio_ * p->viewport()->height()));
#if QT_VERSION >= 0x050000
x->setDevicePixelRatio(pixel_ratio_);
#endif
screen_ = x;
}
}
///
GuiWorkArea * p;
///
QPaintDevice * screen_;
///
BufferView * buffer_view_;
///
GuiView * lyx_view_;