effects: Remove shape property

It's unused and the advantages of keeping it are outweighed by the
disadvantages - the returned value is dependant on the window type.

If you need to draw a drop-shadow that matches the shape of the window
or something along that line, render the window into an offscreen
texture and sample the alpha channel in a fragment shader.

autotests/test_window_paint_data.cpp

@@ -42,7 +42,6 @@ public:
     QByteArray readProperty(long int atom, long int type, int format) const override;
     void refWindow() override;
     void unrefWindow() override;
-    QRegion shape() const override;
     void setData(int role, const QVariant &data) override;
     void minimize() override;
     void unminimize() override;
@@ -109,9 +108,6 @@ public:
     int screen() const override {
         return 0;
     }
-    bool hasOwnShape() const override {
-        return false;
-    }
     QPoint pos() const override {
         return QPoint();
     }
@@ -383,11 +379,6 @@ void MockEffectWindow::closeWindow()
 {
 }
 
-QRegion MockEffectWindow::shape() const
-{
-    return QRegion();
-}
-
 void MockEffectWindow::unrefWindow()
 {
 }

src/effects.cpp

@@ -16,7 +16,6 @@
 #ifdef KWIN_BUILD_ACTIVITIES
 #include "activities.h"
 #endif
-#include "decorationitem.h"
 #include "deleted.h"
 #include "x11client.h"
 #include "cursor.h"
@@ -32,11 +31,9 @@
 #include "scripting/scriptedeffect.h"
 #include "screens.h"
 #include "screenlockerwatcher.h"
-#include "surfaceitem.h"
 #include "thumbnailitem.h"
 #include "virtualdesktops.h"
 #include "window_property_notify_x11_filter.h"
-#include "windowitem.h"
 #include "workspace.h"
 #include "kwinglutils.h"
 #include "kwineffectquickview.h"
@@ -1886,7 +1883,6 @@ TOPLEVEL_HELPER(bool, isOnScreenDisplay, isOnScreenDisplay)
 TOPLEVEL_HELPER(bool, isComboBox, isComboBox)
 TOPLEVEL_HELPER(bool, isDNDIcon, isDNDIcon)
 TOPLEVEL_HELPER(bool, isDeleted, isDeleted)
-TOPLEVEL_HELPER(bool, hasOwnShape, shape)
 TOPLEVEL_HELPER(QString, windowRole, windowRole)
 TOPLEVEL_HELPER(QStringList, activities, activities)
 TOPLEVEL_HELPER(bool, skipsCloseAnimation, skipsCloseAnimation)
@@ -1987,19 +1983,6 @@ void EffectWindowImpl::setSceneWindow(Scene::Window* w)
     sw = w;
 }
 
-QRegion EffectWindowImpl::shape() const
-{
-    if (isX11Client()) {
-        const WindowItem *windowItem = sceneWindow()->windowItem();
-        if (DecorationItem *item = windowItem->decorationItem()) {
-            return item->rect();
-        } else if (SurfaceItem *item = windowItem->surfaceItem()) {
-            return item->shape();
-        }
-    }
-    return toplevel->rect();
-}
-
 QRect EffectWindowImpl::decorationInnerRect() const
 {
     auto client = qobject_cast<X11Client *>(toplevel);

src/effects.h

@@ -420,9 +420,7 @@ public:
     QString caption() const override;
 
     QRect expandedGeometry() const override;
-    QRegion shape() const override;
     int screen() const override;
-    bool hasOwnShape() const override; // only for shadow effect, for now
     QPoint pos() const override;
     QSize size() const override;
     QRect rect() const override;

src/libkwineffects/kwineffects.h

@@ -1974,14 +1974,6 @@ class KWINEFFECTS_EXPORT EffectWindow : public QObject
      * Whether this EffectWindow represents an already deleted window and only kept for the compositor for animations.
      */
     Q_PROPERTY(bool deleted READ isDeleted)
-    /**
-     * Whether the window has an own shape
-     */
-    Q_PROPERTY(bool shaped READ hasOwnShape)
-    /**
-     * The Window's shape
-     */
-    Q_PROPERTY(QRegion shape READ shape)
     /**
      * The Caption of the window. Read from WM_NAME property together with a suffix for hostname and shortcut.
      */
@@ -2255,10 +2247,7 @@ public:
      * @since 4.9
      */
     virtual QRect expandedGeometry() const = 0;
-    virtual QRegion shape() const = 0;
     virtual int screen() const = 0;
-    /** @internal Do not use */
-    virtual bool hasOwnShape() const = 0; // only for shadow effect, for now
     virtual QPoint pos() const = 0;
     virtual QSize size() const = 0;
     virtual QRect rect() const = 0;