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[effects/sheet] Fix undesired perspective distortion

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Summary:
If a modal window is near some of screen edges, it will be distorted
in undesired way when it's being animated.

In order to keep perspective distortions invariant, no matter where
the modal window is on the screen, we have to move that modal window
to the origin, scale it, rotate it, translate it, apply perspective projection,
and then move it back.

Test Plan:
* Opened Kate
* Opened "Open File" dialog (during the in animation, it was distorted as expected)
* Closed that dialog (during the out animation, it was distorted as expected)

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: davidedmundson, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D14687
This commit is contained in:
Vlad Zagorodniy 2018-08-08 12:46:21 +03:00
parent 10e99f64c1
commit fb4dc9a9cf
1 changed files with 30 additions and 7 deletions
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37
effects/sheet/sheet.cpp
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@ -85,14 +85,37 @@ void SheetEffect::prePaintWindow(EffectWindow* w, WindowPrePaintData& data, int
void SheetEffect::paintWindow(EffectWindow* w, int mask, QRegion region, WindowPaintData& data)
{
InfoMap::const_iterator info = windows.constFind(w);
if (info != windows.constEnd()) {
const double progress = info->timeLine->currentValue();
QGraphicsRotation rot;
data.setRotationAxis(Qt::XAxis);
data.setRotationAngle(60.0 * (1.0 - progress));
data *= QVector3D(1.0, progress, progress);
data.translate(0.0, - (w->y() - info->parentY) * (1.0 - progress));
if (info == windows.constEnd()) {
effects->paintWindow(w, mask, region, data);
return;
}
// Perspective projection distorts objects near edges of the viewport
// in undesired way. To fix this, the center of the window will be
// moved to the origin, after applying perspective projection, the
// center is moved back to its "original" projected position. Overall,
// this is how the window will be transformed:
// [move to the origin] -> [scale] -> [rotate] -> [translate] ->
// -> [perspective projection] -> [reverse "move to the origin"]
const QMatrix4x4 oldProjMatrix = data.screenProjectionMatrix();
const QRectF windowGeo = w->geometry();
const QVector3D invOffset = oldProjMatrix.map(QVector3D(windowGeo.center()));
QMatrix4x4 invOffsetMatrix;
invOffsetMatrix.translate(invOffset.x(), invOffset.y());
data.setProjectionMatrix(invOffsetMatrix * oldProjMatrix);
// Move the center of the window to the origin.
const QRectF screenGeo = effects->virtualScreenGeometry();
const QPointF offset = screenGeo.center() - windowGeo.center();
data.translate(offset.x(), offset.y());
const double progress = info->timeLine->currentValue();
QGraphicsRotation rot;
data.setRotationAxis(Qt::XAxis);
data.setRotationAngle(60.0 * (1.0 - progress));
data *= QVector3D(1.0, progress, progress);
data.translate(0.0, - (w->y() - info->parentY) * (1.0 - progress));
effects->paintWindow(w, mask, region, data);
}