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Use backing store also with wayland platform
Like with macOS, the Wayland compositor seems to require a backingstore when doing partial updates like we do. This extends the mechanism that has been introduced for macOS. This has to be done at run time, not compile time.
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@ -235,13 +235,27 @@ SyntheticMouseEvent::SyntheticMouseEvent()
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GuiWorkArea::Private::Private(GuiWorkArea * parent)
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: p(parent), buffer_view_(0), lyx_view_(0),
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caret_(0), caret_visible_(false),
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need_resize_(false), preedit_lines_(1),
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last_pixel_ratio_(1.0),
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completer_(new GuiCompleter(p, p)), dialog_mode_(false), shell_escape_(false),
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read_only_(false), clean_(true), externally_modified_(false)
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: p(parent), buffer_view_(0), lyx_view_(0), caret_(0),
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caret_visible_(false), need_resize_(false), preedit_lines_(1),
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last_pixel_ratio_(1.0), completer_(new GuiCompleter(p, p)),
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dialog_mode_(false), shell_escape_(false), read_only_(false),
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clean_(true), externally_modified_(false)
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{
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/* Qt on macOS and Wayland does not respect the
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* Qt::WA_OpaquePaintEvent attribute and resets the widget backing
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* store at each update. Therefore, we use our own backing store in
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* these two cases. */
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#if QT_VERSION >= 0x050000
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use_backingstore_ = guiApp->platformName() == "cocoa"
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|| guiApp->platformName().contains("wayland");
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#else
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# ifdef Q_OS_MAC
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use_backingstore_ = true;
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# else
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use_backingstore_ = false;
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# endif
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#endif
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int const time = QApplication::cursorFlashTime() / 2;
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if (time > 0) {
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caret_timeout_.setInterval(time);
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@ -1261,6 +1275,41 @@ void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
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}
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void GuiWorkArea::Private::resetScreen()
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{
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if (use_backingstore_) {
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int const pr = p->pixelRatio();
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screen_ = QImage(static_cast<int>(pr * p->viewport()->width()),
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static_cast<int>(pr * p->viewport()->height()),
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QImage::Format_ARGB32_Premultiplied);
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# if QT_VERSION >= 0x050000
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screen_.setDevicePixelRatio(pr);
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# endif
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}
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}
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QPaintDevice * GuiWorkArea::Private::screenDevice()
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{
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if (use_backingstore_)
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return &screen_;
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else
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return p->viewport();
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}
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void GuiWorkArea::Private::updateScreen(QRectF const & rc)
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{
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if (use_backingstore_) {
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QPainter qpain(p->viewport());
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double const pr = p->pixelRatio();
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QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr,
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rc.width() * pr, rc.height() * pr);
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qpain.drawImage(rc, screen_, rcs);
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}
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}
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void GuiWorkArea::paintEvent(QPaintEvent * ev)
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{
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// Do not trigger the painting machinery if we are not ready (see
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@ -20,14 +20,6 @@
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#include <QMouseEvent>
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#include <QTimer>
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#ifdef Q_OS_MAC
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/* Qt on macOS does not respect the Qt::WA_OpaquePaintEvent attribute
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* and resets the widget backing store at each update. Therefore, we
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* use our own backing store in this case */
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#define LYX_BACKINGSTORE 1
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#include <QPainter>
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#endif
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namespace lyx {
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class Buffer;
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@ -107,37 +99,12 @@ struct GuiWorkArea::Private
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void paintPreeditText(GuiPainter & pain);
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void resetScreen() {
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#ifdef LYX_BACKINGSTORE
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int const pr = p->pixelRatio();
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screen_ = QImage(static_cast<int>(pr * p->viewport()->width()),
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static_cast<int>(pr * p->viewport()->height()),
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QImage::Format_ARGB32_Premultiplied);
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# if QT_VERSION >= 0x050000
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screen_.setDevicePixelRatio(pr);
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# endif
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#endif
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}
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QPaintDevice * screenDevice() {
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#ifdef LYX_BACKINGSTORE
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return &screen_;
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#else
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return p->viewport();
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#endif
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}
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#ifdef LYX_BACKINGSTORE
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void updateScreen(QRectF const & rc) {
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QPainter qpain(p->viewport());
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double const pr = p->pixelRatio();
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QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr,
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rc.width() * pr, rc.height() * pr);
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qpain.drawImage(rc, screen_, rcs);
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}
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#else
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void updateScreen(QRectF const & ) {}
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#endif
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/// Prepare screen for next painting
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void resetScreen();
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/// Where painting takes place
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QPaintDevice * screenDevice();
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/// Put backingstore to screen if necessary
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void updateScreen(QRectF const & rc);
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///
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GuiWorkArea * p;
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@ -146,10 +113,11 @@ struct GuiWorkArea::Private
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///
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GuiView * lyx_view_;
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#ifdef LYX_BACKINGSTORE
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/// Do we need an intermediate image when painting (for now macOS and Wayland)
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bool use_backingstore_;
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///
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QImage screen_;
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#endif
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///
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CaretWidget * caret_;
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/// is the caret currently displayed
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