File indexing completed on 2024-06-16 05:05:39

 /*
     SPDX-FileCopyrightText: 2010 Fredrik Höglund <fredrik@kde.org>
     SPDX-FileCopyrightText: 2018 Alex Nemeth <alex.nemeth329@gmail.com>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #pragma once
 
 #include "effect/effect.h"
 #include "opengl/glutils.h"
 
 #include <QList>
 
 #include <unordered_map>
 
 namespace KWin
 {
 
 class BlurManagerInterface;
 
 struct BlurRenderData
 {
     /// Temporary render targets needed for the Dual Kawase algorithm, the first texture
     /// contains not blurred background behind the window, it's cached.
     std::vector<std::unique_ptr<GLTexture>> textures;
     std::vector<std::unique_ptr<GLFramebuffer>> framebuffers;
 };
 
 struct BlurEffectData
 {
     /// The region that should be blurred behind the window
     std::optional<QRegion> content;
 
     /// The region that should be blurred behind the frame
     std::optional<QRegion> frame;
 
     /// The render data per screen. Screens can have different color spaces.
     std::unordered_map<Output *, BlurRenderData> render;
 };
 
 class BlurEffect : public KWin::Effect
 {
     Q_OBJECT
 
 public:
     BlurEffect();
     ~BlurEffect() override;
 
     static bool supported();
     static bool enabledByDefault();
 
     void reconfigure(ReconfigureFlags flags) override;
     void prePaintScreen(ScreenPrePaintData &data, std::chrono::milliseconds presentTime) override;
     void prePaintWindow(EffectWindow *w, WindowPrePaintData &data, std::chrono::milliseconds presentTime) override;
     void drawWindow(const RenderTarget &renderTarget, const RenderViewport &viewport, EffectWindow *w, int mask, const QRegion &region, WindowPaintData &data) override;
 
     bool provides(Feature feature) override;
     bool isActive() const override;
 
     int requestedEffectChainPosition() const override
     {
         return 20;
     }
 
     bool eventFilter(QObject *watched, QEvent *event) override;
 
     bool blocksDirectScanout() const override;
 
 public Q_SLOTS:
     void slotWindowAdded(KWin::EffectWindow *w);
     void slotWindowDeleted(KWin::EffectWindow *w);
     void slotScreenRemoved(KWin::Output *screen);
     void slotPropertyNotify(KWin::EffectWindow *w, long atom);
     void setupDecorationConnections(EffectWindow *w);
 
 private:
     void initBlurStrengthValues();
     QRegion blurRegion(EffectWindow *w) const;
     QRegion decorationBlurRegion(const EffectWindow *w) const;
     bool decorationSupportsBlurBehind(const EffectWindow *w) const;
     bool shouldBlur(const EffectWindow *w, int mask, const WindowPaintData &data) const;
     void updateBlurRegion(EffectWindow *w);
     void blur(const RenderTarget &renderTarget, const RenderViewport &viewport, EffectWindow *w, int mask, const QRegion &region, WindowPaintData &data);
     GLTexture *ensureNoiseTexture();
 
 private:
     struct
     {
         std::unique_ptr<GLShader> shader;
         int mvpMatrixLocation;
         int offsetLocation;
         int halfpixelLocation;
     } m_downsamplePass;
 
     struct
     {
         std::unique_ptr<GLShader> shader;
         int mvpMatrixLocation;
         int offsetLocation;
         int halfpixelLocation;
     } m_upsamplePass;
 
     struct
     {
         std::unique_ptr<GLShader> shader;
         int mvpMatrixLocation;
         int noiseTextureSizeLocation;
         int texStartPosLocation;
 
         std::unique_ptr<GLTexture> noiseTexture;
         qreal noiseTextureScale = 1.0;
         int noiseTextureStength = 0;
     } m_noisePass;
 
     bool m_valid = false;
     long net_wm_blur_region = 0;
     QRegion m_paintedArea; // keeps track of all painted areas (from bottom to top)
     QRegion m_currentBlur; // keeps track of the currently blured area of the windows(from bottom to top)
     Output *m_currentScreen = nullptr;
 
     size_t m_iterationCount; // number of times the texture will be downsized to half size
     int m_offset;
     int m_expandSize;
     int m_noiseStrength;
 
     struct OffsetStruct
     {
         float minOffset;
         float maxOffset;
         int expandSize;
     };
 
     QList<OffsetStruct> blurOffsets;
 
     struct BlurValuesStruct
     {
         int iteration;
         float offset;
     };
 
     QList<BlurValuesStruct> blurStrengthValues;
 
     QMap<EffectWindow *, QMetaObject::Connection> windowBlurChangedConnections;
     std::unordered_map<EffectWindow *, BlurEffectData> m_windows;
 
     static BlurManagerInterface *s_blurManager;
     static QTimer *s_blurManagerRemoveTimer;
 };
 
 inline bool BlurEffect::provides(Effect::Feature feature)
 {
     if (feature == Blur) {
         return true;
     }
     return KWin::Effect::provides(feature);
 }
 
 } // namespace KWin