bfa9646d1d
A new backend which doesn't present the rendered output. It uses a QPainter scene, renders to a QImage but doesn't present it anywhere. Thus a real virtual backend. By exporting the environment variable KWIN_WAYLAND_VIRTUAL_SCREENSHOTS the backend creates a temporary dir, prints the path to std-out and saves each rendered frame into that directory. Of course with exit it will be deleted again.
99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/********************************************************************
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KWin - the KDE window manager
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This file is part of the KDE project.
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Copyright (C) 2015 Martin Gräßlin <mgraesslin@kde.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************/
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#include "scene_qpainter_virtual_backend.h"
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#include "virtual_backend.h"
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#include "cursor.h"
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#include <QDebug>
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#include <QPainter>
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#include <QTemporaryDir>
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namespace KWin
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{
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VirtualQPainterBackend::VirtualQPainterBackend(VirtualBackend *backend)
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: QPainterBackend()
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, m_backBuffer(backend->size(), QImage::Format_RGB32)
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, m_backend(backend)
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{
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if (qEnvironmentVariableIsSet("KWIN_WAYLAND_VIRTUAL_SCREENSHOTS")) {
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m_screenshotDir.reset(new QTemporaryDir);
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if (!m_screenshotDir->isValid()) {
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m_screenshotDir.reset();
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}
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if (!m_screenshotDir.isNull()) {
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qDebug() << "Screenshots saved to: " << m_screenshotDir->path();
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}
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}
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}
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VirtualQPainterBackend::~VirtualQPainterBackend() = default;
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QImage *VirtualQPainterBackend::buffer()
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{
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return &m_backBuffer;
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}
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bool VirtualQPainterBackend::needsFullRepaint() const
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{
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return true;
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}
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void VirtualQPainterBackend::prepareRenderingFrame()
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{
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}
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void VirtualQPainterBackend::screenGeometryChanged(const QSize &size)
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{
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if (m_backBuffer.size() != size) {
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m_backBuffer = QImage(size, QImage::Format_RGB32);
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m_backBuffer.fill(Qt::black);
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}
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}
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void VirtualQPainterBackend::present(int mask, const QRegion &damage)
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{
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Q_UNUSED(mask)
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Q_UNUSED(damage)
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if (!m_screenshotDir.isNull()) {
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m_backBuffer.save(QStringLiteral("%1/%2.png").arg(m_screenshotDir->path()).arg(QString::number(m_frameCounter++)));
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}
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}
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bool VirtualQPainterBackend::usesOverlayWindow() const
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{
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return false;
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}
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void VirtualQPainterBackend::renderCursor(QPainter *painter)
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{
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if (!m_backend->usesSoftwareCursor()) {
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return;
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}
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const QImage img = m_backend->softwareCursor();
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if (img.isNull()) {
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return;
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}
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const QPoint cursorPos = Cursor::pos();
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const QPoint hotspot = m_backend->softwareCursorHotspot();
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painter->drawImage(cursorPos - hotspot, img);
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m_backend->markCursorAsRendered();
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}
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}
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