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backing store

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This commit is contained in:
Jean-Marc Lasgouttes 2019-05-20 18:36:24 +02:00
parent 4c587fb9da
commit 1a2b1a3bfa
2 changed files with 64 additions and 47 deletions
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61
src/frontends/qt4/GuiWorkArea.cpp
View File

@ -235,13 +235,27 @@ SyntheticMouseEvent::SyntheticMouseEvent()
GuiWorkArea::Private::Private(GuiWorkArea * parent)
: p(parent), buffer_view_(0), lyx_view_(0),
caret_(0), caret_visible_(false),
need_resize_(false), preedit_lines_(1),
last_pixel_ratio_(1.0),
completer_(new GuiCompleter(p, p)), dialog_mode_(false), shell_escape_(false),
read_only_(false), clean_(true), externally_modified_(false)
: p(parent), buffer_view_(0), lyx_view_(0), caret_(0),
caret_visible_(false), need_resize_(false), preedit_lines_(1),
last_pixel_ratio_(1.0), completer_(new GuiCompleter(p, p)),
dialog_mode_(false), shell_escape_(false), read_only_(false),
clean_(true), externally_modified_(false)
{
/* Qt on macOS and Wayland does not respect the
* Qt::WA_OpaquePaintEvent attribute and resets the widget backing
* store at each update. Therefore, we use our own backing store in
* these two cases. */
#if QT_VERSION >= 0x050000
use_backingstore_ = guiApp->platformName() == "cocoa"
|| guiApp->platformName() == "wayland";
#else
# ifdef Q_OS_MAC
use_backingstore_ = true;
# else
use_backingstore_ = false;
# endif
#endif
int const time = QApplication::cursorFlashTime() / 2;
if (time > 0) {
caret_timeout_.setInterval(time);
@ -1261,6 +1275,41 @@ void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
}
void GuiWorkArea::Private::resetScreen()
{
if (use_backingstore_) {
int const pr = p->pixelRatio();
screen_ = QImage(static_cast<int>(pr * p->viewport()->width()),
static_cast<int>(pr * p->viewport()->height()),
QImage::Format_ARGB32_Premultiplied);
# if QT_VERSION >= 0x050000
screen_.setDevicePixelRatio(pr);
# endif
}
}
QPaintDevice * GuiWorkArea::Private::screenDevice()
{
if (use_backingstore_)
return &screen_;
else
return p->viewport();
}
void GuiWorkArea::Private::updateScreen(QRectF const & rc)
{
if (use_backingstore_) {
QPainter qpain(p->viewport());
double const pr = p->pixelRatio();
QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr,
rc.width() * pr, rc.height() * pr);
qpain.drawImage(rc, screen_, rcs);
}
}
void GuiWorkArea::paintEvent(QPaintEvent * ev)
{
// Do not trigger the painting machinery if we are not ready (see

50
src/frontends/qt4/GuiWorkArea_Private.h
View File

@ -20,14 +20,6 @@
#include <QMouseEvent>
#include <QTimer>
#ifdef Q_OS_MAC
/* Qt on macOS does not respect the Qt::WA_OpaquePaintEvent attribute
* and resets the widget backing store at each update. Therefore, we
* use our own backing store in this case */
#define LYX_BACKINGSTORE 1
#include <QPainter>
#endif
namespace lyx {
class Buffer;
@ -107,37 +99,12 @@ struct GuiWorkArea::Private
void paintPreeditText(GuiPainter & pain);
void resetScreen() {
#ifdef LYX_BACKINGSTORE
int const pr = p->pixelRatio();
screen_ = QImage(static_cast<int>(pr * p->viewport()->width()),
static_cast<int>(pr * p->viewport()->height()),
QImage::Format_ARGB32_Premultiplied);
# if QT_VERSION >= 0x050000
screen_.setDevicePixelRatio(pr);
# endif
#endif
}
QPaintDevice * screenDevice() {
#ifdef LYX_BACKINGSTORE
return &screen_;
#else
return p->viewport();
#endif
}
#ifdef LYX_BACKINGSTORE
void updateScreen(QRectF const & rc) {
QPainter qpain(p->viewport());
double const pr = p->pixelRatio();
QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr,
rc.width() * pr, rc.height() * pr);
qpain.drawImage(rc, screen_, rcs);
}
#else
void updateScreen(QRectF const & ) {}
#endif
/// Prepare screen for next painting
void resetScreen();
/// Where painting takes place
QPaintDevice * screenDevice();
/// Put backingstore to screen if necessary
void updateScreen(QRectF const & rc);
///
GuiWorkArea * p;
@ -146,10 +113,11 @@ struct GuiWorkArea::Private
///
GuiView * lyx_view_;
#ifdef LYX_BACKINGSTORE
/// Do we need an intermediate image when painting (for now macOS and Wayland)
bool use_backingstore_;
///
QImage screen_;
#endif
///
CaretWidget * caret_;
/// is the caret currently displayed