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platforms/drm: Compute correct cursor transform matrix

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Currently, when the DRM platform uses cursor planes, the cursor on
a rotated output may be cropped because the math behind the current
cursor transform matrix is off.

In order to fix the cropping issue, this change replaces the current
cursor transform matrix with the core part of the surface-to-buffer
matrix, which was written against the wl_output spec.

BUG: 427605
CCBUG: 427060
This commit is contained in:
Vlad Zahorodnii 2020-10-12 23:56:07 +03:00
parent 33fad70c9b
commit 3b8e489b6f
2 changed files with 39 additions and 12 deletions
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50
plugins/platforms/drm/drm_output.cpp
View file

@ -133,18 +133,45 @@ bool DrmOutput::showCursor()
return ret;
}
QMatrix4x4 DrmOutput::matrixDisplay(const QSize &s) const
static QMatrix4x4 matrixForTransform(const QRectF &rect, qreal scale, DrmOutput::Transform transform)
{
QMatrix4x4 matrix;
const int angle = rotation();
if (angle) {
const QSize center = s / 2;
matrix.translate(center.width(), center.height());
matrix.rotate(-angle, 0, 0, 1);
matrix.translate(-center.width(), -center.height());
matrix.scale(scale);
switch (transform) {
case DrmOutput::Transform::Normal:
case DrmOutput::Transform::Flipped:
break;
case DrmOutput::Transform::Rotated90:
case DrmOutput::Transform::Flipped90:
matrix.translate(0, rect.width());
matrix.rotate(-90, 0, 0, 1);
break;
case DrmOutput::Transform::Rotated180:
case DrmOutput::Transform::Flipped180:
matrix.translate(rect.width(), rect.height());
matrix.rotate(-180, 0, 0, 1);
break;
case DrmOutput::Transform::Rotated270:
case DrmOutput::Transform::Flipped270:
matrix.translate(rect.height(), 0);
matrix.rotate(-270, 0, 0, 1);
break;
}
matrix.scale(scale());
switch (transform) {
case DrmOutput::Transform::Flipped:
case DrmOutput::Transform::Flipped180:
case DrmOutput::Transform::Flipped90:
case DrmOutput::Transform::Flipped270:
matrix.translate(rect.width(), 0);
matrix.scale(-1, 1);
break;
default:
break;
}
return matrix;
}
@ -163,15 +190,13 @@ void DrmOutput::updateCursor()
QPainter p;
p.begin(c);
p.setWorldTransform(matrixDisplay(QSize(cursorImage.width(), cursorImage.height())).toTransform());
p.setWorldTransform(matrixForTransform(cursorImage.rect(), scale(), transform()).toTransform());
p.drawImage(QPoint(0, 0), cursorImage);
p.end();
}
void DrmOutput::moveCursor(Cursor *cursor, const QPoint &globalPos)
{
const QMatrix4x4 hotspotMatrix = matrixDisplay(cursor->image().size());
const QPoint localPos = globalPos - AbstractWaylandOutput::globalPos();
QPoint pos = localPos;
@ -197,7 +222,10 @@ void DrmOutput::moveCursor(Cursor *cursor, const QPoint &globalPos)
Q_UNREACHABLE();
}
pos *= scale();
const QMatrix4x4 hotspotMatrix = matrixForTransform(cursor->image().rect(), scale(), transform());
pos -= hotspotMatrix.map(cursor->hotspot());
drmModeMoveCursor(m_gpu->fd(), m_crtc->id(), pos.x(), pos.y());
}

1
plugins/platforms/drm/drm_output.h
View file

@ -142,7 +142,6 @@ private:
int gammaRampSize() const override;
bool setGammaRamp(const GammaRamp &gamma) override;
QMatrix4x4 matrixDisplay(const QSize &s) const;
DrmBackend *m_backend;
DrmGpu *m_gpu;