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[platforms/drm] Add hardware transformation API

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Summary:
Planes might be able to do transformations without compositing required.
When changing the current transform try this with the primary plane. If this
fails fall back to no transformation at all through hardware and communicate
the fact and other information through some getters.

Also adds an environment variable to never do hardware transformations.

Test Plan: Compiles.

Reviewers: #kwin

Subscribers: zzag, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D25906
This commit is contained in:
Roman Gilg 2020-01-02 14:55:02 +00:00 committed by David Edmundson
parent ed5768181e
commit dfea5798f1
2 changed files with 69 additions and 25 deletions
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65
plugins/platforms/drm/drm_output.cpp
View file

@ -650,35 +650,64 @@ bool DrmOutput::dpmsLegacyApply()
return true;
}
void DrmOutput::updateTransform(Transform transform)
DrmPlane::Transformations outputToPlaneTransform(DrmOutput::Transform transform)
{
DrmPlane::Transformation planeTransform;
using OutTrans = DrmOutput::Transform;
using PlaneTrans = DrmPlane::Transformation;
// TODO: Do we want to support reflections (flips)?
switch (transform) {
case Transform::Normal:
case Transform::Flipped:
planeTransform = DrmPlane::Transformation::Rotate0;
break;
case Transform::Rotated90:
case Transform::Flipped90:
planeTransform = DrmPlane::Transformation::Rotate90;
break;
case Transform::Rotated180:
case Transform::Flipped180:
planeTransform = DrmPlane::Transformation::Rotate180;
break;
case Transform::Rotated270:
case Transform::Flipped270:
planeTransform = DrmPlane::Transformation::Rotate270;
break;
case OutTrans::Normal:
case OutTrans::Flipped:
return PlaneTrans::Rotate0;
case OutTrans::Rotated90:
case OutTrans::Flipped90:
return PlaneTrans::Rotate90;
case OutTrans::Rotated180:
case OutTrans::Flipped180:
return PlaneTrans::Rotate180;
case OutTrans::Rotated270:
case OutTrans::Flipped270:
return PlaneTrans::Rotate270;
default:
Q_UNREACHABLE();
}
}
bool DrmOutput::hardwareTransforms() const
{
if (!m_primaryPlane) {
return false;
}
return m_primaryPlane->transformation() == outputToPlaneTransform(transform());
}
int DrmOutput::rotation() const
{
return transformToRotation(transform());
}
void DrmOutput::updateTransform(Transform transform)
{
const auto planeTransform = outputToPlaneTransform(transform);
if (m_primaryPlane) {
// At the moment we have to exclude hardware transforms for vertical buffers.
// For that we need to support other buffers and graceful fallback from atomic tests.
// Reason is that standard linear buffers are not suitable.
const bool isPortrait = transform == Transform::Rotated90
|| transform == Transform::Flipped90
|| transform == Transform::Rotated270
|| transform == Transform::Flipped270;
if (!qEnvironmentVariableIsSet("KWIN_DRM_SW_ROTATIONS_ONLY") &&
(m_primaryPlane->supportedTransformations() & planeTransform) &&
!isPortrait) {
m_primaryPlane->setTransformation(planeTransform);
} else {
m_primaryPlane->setTransformation(DrmPlane::Transformation::Rotate0);
}
}
m_modesetRequested = true;

15
plugins/platforms/drm/drm_output.h
View file

@ -83,6 +83,21 @@ public:
bool supportsTransformations() const;
/**
* Drm planes might be capable of realizing the current output transform without usage
* of compositing. This is a getter to query the current state of that
*
* @return true if the hardware realizes the transform without further assistance
*/
bool hardwareTransforms() const;
/**
* The current rotation of the output
*
* @return rotation in degree
*/
int rotation() const;
private:
friend class DrmBackend;
friend class DrmCrtc; // TODO: For use of setModeLegacy. Remove later when we allow multiple connectors per crtc