kwin/plugins/platforms/drm/scene_qpainter_drm_backend.cpp

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2015 Martin Gräßlin <mgraesslin@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "scene_qpainter_drm_backend.h"
#include "drm_backend.h"
#include "drm_output.h"
#include "logind.h"
namespace KWin
{
DrmQPainterBackend::DrmQPainterBackend(DrmBackend *backend)
: QObject()
, QPainterBackend()
, m_backend(backend)
{
const auto outputs = m_backend->drmOutputs();
for (auto output: outputs) {
initOutput(output);
}
connect(m_backend, &DrmBackend::outputAdded, this, &DrmQPainterBackend::initOutput);
connect(m_backend, &DrmBackend::outputRemoved, this,
[this] (DrmOutput *o) {
auto it = std::find_if(m_outputs.begin(), m_outputs.end(),
[o] (const Output &output) {
return output.output == o;
}
);
if (it == m_outputs.end()) {
return;
}
delete (*it).buffer[0];
delete (*it).buffer[1];
m_outputs.erase(it);
}
);
}
DrmQPainterBackend::~DrmQPainterBackend()
{
for (auto it = m_outputs.begin(); it != m_outputs.end(); ++it) {
delete (*it).buffer[0];
delete (*it).buffer[1];
}
}
void DrmQPainterBackend::initOutput(DrmOutput *output)
{
Output o;
auto initBuffer = [&o, output, this] (int index) {
o.buffer[index] = m_backend->createBuffer(output->pixelSize());
if (o.buffer[index]->map()) {
o.buffer[index]->image()->fill(Qt::black);
}
};
connect(output, &DrmOutput::modeChanged, this,
[output, this] {
auto it = std::find_if(m_outputs.begin(), m_outputs.end(),
[output] (const auto &o) {
return o.output == output;
}
);
if (it == m_outputs.end()) {
return;
}
delete (*it).buffer[0];
delete (*it).buffer[1];
auto initBuffer = [it, output, this] (int index) {
it->buffer[index] = m_backend->createBuffer(output->pixelSize());
if (o.buffer[index]->map()) {
it->buffer[index]->image()->fill(Qt::black);
}
};
initBuffer(0);
initBuffer(1);
}
);
initBuffer(0);
initBuffer(1);
o.output = output;
m_outputs << o;
}
QImage *DrmQPainterBackend::buffer()
{
return bufferForScreen(0);
}
QImage *DrmQPainterBackend::bufferForScreen(int screenId)
{
const Output &o = m_outputs.at(screenId);
return o.buffer[o.index]->image();
}
bool DrmQPainterBackend::needsFullRepaint() const
{
return true;
}
void DrmQPainterBackend::prepareRenderingFrame()
{
for (auto it = m_outputs.begin(); it != m_outputs.end(); ++it) {
(*it).index = ((*it).index + 1) % 2;
}
}
void DrmQPainterBackend::present(int mask, const QRegion &damage)
{
Q_UNUSED(mask)
Q_UNUSED(damage)
if (!LogindIntegration::self()->isActiveSession()) {
return;
}
for (auto it = m_outputs.begin(); it != m_outputs.end(); ++it) {
const Output &o = *it;
m_backend->present(o.buffer[o.index], o.output);
}
}
bool DrmQPainterBackend::usesOverlayWindow() const
{
return false;
}
bool DrmQPainterBackend::perScreenRendering() const
{
return true;
}
}