kwin/scene_qpainter.h

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2013 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/>.
*********************************************************************/
#ifndef KWIN_SCENE_QPAINTER_H
#define KWIN_SCENE_QPAINTER_H
#include "scene.h"
#include "shadow.h"
#include "decorations/decorationrenderer.h"
namespace KWin {
class KWIN_EXPORT QPainterBackend
{
public:
virtual ~QPainterBackend();
virtual void present(int mask, const QRegion &damage) = 0;
/**
* @brief Returns the OverlayWindow used by the backend.
*
* A backend does not have to use an OverlayWindow, this is mostly for the X world.
* In case the backend does not use an OverlayWindow it is allowed to return @c null.
* It's the task of the caller to check whether it is @c null.
*
* @return :OverlayWindow*
**/
virtual OverlayWindow *overlayWindow();
virtual bool usesOverlayWindow() const = 0;
virtual void prepareRenderingFrame() = 0;
/**
* @brief Shows the Overlay Window
*
* Default implementation does nothing.
*/
virtual void showOverlay();
/**
* @brief React on screen geometry changes.
*
* Default implementation does nothing. Override if specific functionality is required.
*
* @param size The new screen size
*/
virtual void screenGeometryChanged(const QSize &size);
/**
* @brief Whether the creation of the Backend failed.
*
* The SceneQPainter should test whether the Backend got constructed correctly. If this method
* returns @c true, the SceneQPainter should not try to start the rendering.
*
* @return bool @c true if the creation of the Backend failed, @c false otherwise.
**/
bool isFailed() const {
return m_failed;
}
virtual QImage *buffer() = 0;
/**
* Overload for the case that there is a different buffer per screen.
* Default implementation just calls buffer.
* @param screenId The id of the screen as used in Screens
* @todo Get a better identifier for screen then a counter variable
**/
virtual QImage *bufferForScreen(int screenId);
virtual bool needsFullRepaint() const = 0;
/**
* Whether the rendering needs to be split per screen.
* Default implementation returns @c false.
**/
virtual bool perScreenRendering() const;
protected:
QPainterBackend();
/**
* @brief Sets the backend initialization to failed.
*
* This method should be called by the concrete subclass in case the initialization failed.
* The given @p reason is logged as a warning.
*
* @param reason The reason why the initialization failed.
**/
void setFailed(const QString &reason);
private:
bool m_failed;
};
class KWIN_EXPORT SceneQPainter : public Scene
{
Q_OBJECT
public:
virtual ~SceneQPainter();
virtual bool usesOverlayWindow() const override;
virtual OverlayWindow* overlayWindow() override;
virtual qint64 paint(QRegion damage, ToplevelList windows) override;
virtual void paintGenericScreen(int mask, ScreenPaintData data) override;
virtual CompositingType compositingType() const override;
virtual bool initFailed() const override;
virtual EffectFrame *createEffectFrame(EffectFrameImpl *frame) override;
virtual Shadow *createShadow(Toplevel *toplevel) override;
Decoration::Renderer *createDecorationRenderer(Decoration::DecoratedClientImpl *impl) override;
void screenGeometryChanged(const QSize &size) override;
bool animationsSupported() const override {
return false;
}
QPainter *painter();
QPainterBackend *backend() const {
return m_backend.data();
}
static SceneQPainter *createScene(QObject *parent);
protected:
virtual void paintBackground(QRegion region) override;
virtual Scene::Window *createWindow(Toplevel *toplevel) override;
private:
explicit SceneQPainter(QPainterBackend *backend, QObject *parent = nullptr);
void paintCursor();
QScopedPointer<QPainterBackend> m_backend;
QScopedPointer<QPainter> m_painter;
class Window;
};
class SceneQPainter::Window : public Scene::Window
{
public:
Window(SceneQPainter *scene, Toplevel *c);
virtual ~Window();
virtual void performPaint(int mask, QRegion region, WindowPaintData data) override;
protected:
virtual WindowPixmap *createWindowPixmap() override;
private:
void renderShadow(QPainter *painter);
void renderWindowDecorations(QPainter *painter);
SceneQPainter *m_scene;
};
class QPainterWindowPixmap : public WindowPixmap
{
public:
explicit QPainterWindowPixmap(Scene::Window *window);
virtual ~QPainterWindowPixmap();
virtual void create() override;
void updateBuffer() override;
const QImage &image();
protected:
WindowPixmap *createChild(const QPointer<KWayland::Server::SubSurfaceInterface> &subSurface) override;
private:
explicit QPainterWindowPixmap(const QPointer<KWayland::Server::SubSurfaceInterface> &subSurface, WindowPixmap *parent);
QImage m_image;
};
class QPainterEffectFrame : public Scene::EffectFrame
{
public:
QPainterEffectFrame(EffectFrameImpl *frame, SceneQPainter *scene);
virtual ~QPainterEffectFrame();
virtual void crossFadeIcon() override {}
virtual void crossFadeText() override {}
virtual void free() override {}
virtual void freeIconFrame() override {}
virtual void freeTextFrame() override {}
virtual void freeSelection() override {}
virtual void render(QRegion region, double opacity, double frameOpacity) override;
private:
SceneQPainter *m_scene;
};
class SceneQPainterShadow : public Shadow
{
public:
SceneQPainterShadow(Toplevel* toplevel);
virtual ~SceneQPainterShadow();
using Shadow::ShadowElements;
using Shadow::ShadowElementTop;
using Shadow::ShadowElementTopRight;
using Shadow::ShadowElementRight;
using Shadow::ShadowElementBottomRight;
using Shadow::ShadowElementBottom;
using Shadow::ShadowElementBottomLeft;
using Shadow::ShadowElementLeft;
using Shadow::ShadowElementTopLeft;
using Shadow::ShadowElementsCount;
using Shadow::shadowPixmap;
using Shadow::topOffset;
using Shadow::leftOffset;
using Shadow::rightOffset;
using Shadow::bottomOffset;
protected:
virtual bool prepareBackend() override;
};
class SceneQPainterDecorationRenderer : public Decoration::Renderer
{
Q_OBJECT
public:
enum class DecorationPart : int {
Left,
Top,
Right,
Bottom,
Count
};
explicit SceneQPainterDecorationRenderer(Decoration::DecoratedClientImpl *client);
virtual ~SceneQPainterDecorationRenderer();
void render() override;
void reparent(Deleted *deleted) override;
QImage image(DecorationPart part) const;
private:
void resizeImages();
QImage m_images[int(DecorationPart::Count)];
};
inline
bool SceneQPainter::usesOverlayWindow() const
{
return m_backend->usesOverlayWindow();
}
inline
OverlayWindow* SceneQPainter::overlayWindow()
{
return m_backend->overlayWindow();
}
inline
QPainter* SceneQPainter::painter()
{
return m_painter.data();
}
inline
const QImage &QPainterWindowPixmap::image()
{
return m_image;
}
} // KWin
#endif // KWIN_SCENEQPAINTER_H