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wayland: Introduce SurfaceInterface::bufferSourceBox()

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The bufferSourceBox provides a way to get the source region of the
attached buffer. It can be used to compute the effective scale factor
when using wp_viewport.
This commit is contained in:
Vlad Zahorodnii 2023-07-04 09:13:49 +03:00
parent bad25bd5c7
commit b98ffaf785
4 changed files with 94 additions and 0 deletions
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75
src/core/output.cpp
View file

@ -60,6 +60,81 @@ OutputMode::Flags OutputMode::flags() const
return m_flags;
}
Output::Transform invertOutputTransform(Output::Transform transform)
{
switch (transform) {
case Output::Transform::Normal:
return Output::Transform::Normal;
case Output::Transform::Rotated90:
return Output::Transform::Rotated270;
case Output::Transform::Rotated180:
return Output::Transform::Rotated180;
case Output::Transform::Rotated270:
return Output::Transform::Rotated90;
case Output::Transform::Flipped:
case Output::Transform::Flipped90:
case Output::Transform::Flipped180:
case Output::Transform::Flipped270:
return transform; // inverse transform of a flip transform is itself
}
}
QRectF applyOutputTransform(const QRectF &rect, const QSizeF &bounds, Output::Transform transform)
{
QRectF dest;
switch (transform) {
case Output::Transform::Normal:
case Output::Transform::Rotated180:
case Output::Transform::Flipped:
case Output::Transform::Flipped180:
dest.setWidth(rect.width());
dest.setHeight(rect.height());
break;
default:
dest.setWidth(rect.height());
dest.setHeight(rect.width());
break;
}
switch (transform) {
case Output::Transform::Normal:
dest.setX(rect.x());
dest.setY(rect.y());
break;
case Output::Transform::Rotated90:
dest.setX(bounds.height() - (rect.y() + rect.height()));
dest.setY(rect.x());
break;
case Output::Transform::Rotated180:
dest.setX(bounds.width() - (rect.x() + rect.width()));
dest.setY(bounds.height() - (rect.y() + rect.height()));
break;
case Output::Transform::Rotated270:
dest.setX(rect.y());
dest.setY(bounds.width() - (rect.x() + rect.width()));
break;
case Output::Transform::Flipped:
dest.setX(bounds.width() - (rect.x() + rect.width()));
dest.setY(rect.y());
break;
case Output::Transform::Flipped90:
dest.setX(rect.y());
dest.setY(rect.x());
break;
case Output::Transform::Flipped180:
dest.setX(rect.x());
dest.setY(bounds.height() - (rect.y() + rect.height()));
break;
case Output::Transform::Flipped270:
dest.setX(bounds.height() - (rect.y() + rect.height()));
dest.setY(bounds.width() - (rect.x() + rect.width()));
break;
}
return dest;
}
Output::Output(QObject *parent)
: QObject(parent)
{

4
src/core/output.h
View file

@ -371,6 +371,10 @@ protected:
friend class EffectScreenImpl; // to access m_effectScreen
};
// TODO: Introduce an OutputTransform type with two methods: invert + apply?
KWIN_EXPORT Output::Transform invertOutputTransform(Output::Transform transform);
KWIN_EXPORT QRectF applyOutputTransform(const QRectF &rect, const QSizeF &bounds, Output::Transform transform);
inline QRect Output::rect() const
{
return QRect(QPoint(0, 0), geometry().size());

14
src/wayland/surface_interface.cpp
View file

@ -785,6 +785,20 @@ QRegion SurfaceInterface::input() const
return d->inputRegion;
}
QRectF SurfaceInterface::bufferSourceBox() const
{
if (!d->current.viewport.sourceGeometryIsSet) {
return QRectF(0, 0, d->bufferSize.width(), d->bufferSize.height());
}
const QRectF box(d->current.viewport.sourceGeometry.x() * d->current.bufferScale,
d->current.viewport.sourceGeometry.y() * d->current.bufferScale,
d->current.viewport.sourceGeometry.width() * d->current.bufferScale,
d->current.viewport.sourceGeometry.height() * d->current.bufferScale);
return KWin::applyOutputTransform(box, d->bufferSize, KWin::invertOutputTransform(d->current.bufferTransform));
}
KWin::Output::Transform SurfaceInterface::bufferTransform() const
{
return d->current.bufferTransform;

1
src/wayland/surface_interface.h
View file

@ -145,6 +145,7 @@ public:
QRegion opaque() const;
QRegion input() const;
QRegion bufferDamage() const;
QRectF bufferSourceBox() const;
/**
* Returns the buffer transform that had been applied to the buffer to compensate for
* output rotation.