109 lines
3.4 KiB
C++
109 lines
3.4 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) 2013 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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#ifndef KWIN_SCENE_QPAINTER_BACKEND_H
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#define KWIN_SCENE_QPAINTER_BACKEND_H
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class QImage;
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class QRegion;
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class QSize;
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class QString;
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namespace KWin {
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class OverlayWindow;
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class QPainterBackend
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{
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public:
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virtual ~QPainterBackend();
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virtual void present(int mask, const QRegion &damage) = 0;
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/**
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* @brief Returns the OverlayWindow used by the backend.
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*
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* A backend does not have to use an OverlayWindow, this is mostly for the X world.
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* In case the backend does not use an OverlayWindow it is allowed to return @c null.
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* It's the task of the caller to check whether it is @c null.
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*
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* @return :OverlayWindow*
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**/
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virtual OverlayWindow *overlayWindow();
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virtual bool usesOverlayWindow() const = 0;
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virtual void prepareRenderingFrame() = 0;
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/**
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* @brief Shows the Overlay Window
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*
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* Default implementation does nothing.
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*/
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virtual void showOverlay();
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/**
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* @brief React on screen geometry changes.
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*
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* Default implementation does nothing. Override if specific functionality is required.
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*
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* @param size The new screen size
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*/
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virtual void screenGeometryChanged(const QSize &size);
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/**
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* @brief Whether the creation of the Backend failed.
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*
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* The SceneQPainter should test whether the Backend got constructed correctly. If this method
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* returns @c true, the SceneQPainter should not try to start the rendering.
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*
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* @return bool @c true if the creation of the Backend failed, @c false otherwise.
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**/
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bool isFailed() const {
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return m_failed;
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}
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virtual QImage *buffer() = 0;
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/**
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* Overload for the case that there is a different buffer per screen.
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* Default implementation just calls buffer.
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* @param screenId The id of the screen as used in Screens
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* @todo Get a better identifier for screen then a counter variable
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**/
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virtual QImage *bufferForScreen(int screenId);
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virtual bool needsFullRepaint() const = 0;
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/**
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* Whether the rendering needs to be split per screen.
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* Default implementation returns @c false.
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**/
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virtual bool perScreenRendering() const;
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protected:
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QPainterBackend();
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/**
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* @brief Sets the backend initialization to failed.
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*
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* This method should be called by the concrete subclass in case the initialization failed.
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* The given @p reason is logged as a warning.
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*
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* @param reason The reason why the initialization failed.
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**/
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void setFailed(const QString &reason);
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private:
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bool m_failed;
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};
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} // KWin
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#endif
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