rules: add window rule to force tearing on or off

This allows the user to override which presentation mode individual apps request

src/compositor_wayland.cpp

@@ -329,7 +329,7 @@ void WaylandCompositor::composite(RenderLoop *renderLoop)
 
         const bool wantsAdaptiveSync = activeWindow && activeWindow->isOnOutput(output) && activeWindow->wantsAdaptiveSync();
         const bool vrr = (output->capabilities() & Output::Capability::Vrr) && (output->vrrPolicy() == VrrPolicy::Always || (output->vrrPolicy() == VrrPolicy::Automatic && wantsAdaptiveSync));
-        const bool tearing = (output->capabilities() & Output::Capability::Tearing) && options->allowTearing() && activeFullscreenItem && activeFullscreenItem->presentationHint() == PresentationModeHint::Async;
+        const bool tearing = (output->capabilities() & Output::Capability::Tearing) && options->allowTearing() && activeFullscreenItem && activeWindow->wantsTearing(activeFullscreenItem->presentationHint() == PresentationModeHint::Async);
         if (vrr) {
             frame->setPresentationMode(tearing ? PresentationMode::AdaptiveAsync : PresentationMode::AdaptiveSync);
         } else {

src/kcms/rules/rulesmodel.cpp

@@ -724,6 +724,11 @@ void RulesModel::populateRuleList()
                          RulePolicy::ForceRule, RuleItem::Boolean,
                          i18n("Adaptive Sync"), i18n("Appearance & Fixes"),
                          QIcon::fromTheme("monitor-symbolic")));
+
+    addRule(new RuleItem(QLatin1String("tearing"),
+                         RulePolicy::ForceRule, RuleItem::Boolean,
+                         i18n("Allow Tearing"), i18n("Appearance & Fixes"),
+                         QIcon::fromTheme("monitor-symbolic")));
 }
 
 const QHash<QString, QString> RulesModel::x11PropertyHash()

src/rules.cpp

@@ -76,6 +76,7 @@ Rules::Rules()
     , disableglobalshortcutsrule(UnusedForceRule)
     , desktopfilerule(UnusedSetRule)
     , adaptivesyncrule(UnusedForceRule)
+    , tearingrule(UnusedForceRule)
 {
 }
 
@@ -160,6 +161,7 @@ void Rules::readFromSettings(const RuleSettings *settings)
     READ_SET_RULE(desktopfile);
     READ_FORCE_RULE(layer, );
     READ_FORCE_RULE(adaptivesync, );
+    READ_FORCE_RULE(tearing, );
 }
 
 #undef READ_MATCH_STRING
@@ -255,7 +257,7 @@ void Rules::write(RuleSettings *settings) const
 // returns true if it doesn't affect anything
 bool Rules::isEmpty() const
 {
-    return (placementrule == UnusedForceRule
+    return placementrule == UnusedForceRule
         && positionrule == UnusedSetRule
         && sizerule == UnusedSetRule
         && minsizerule == UnusedForceRule
@@ -291,7 +293,8 @@ bool Rules::isEmpty() const
         && disableglobalshortcutsrule == UnusedForceRule
         && desktopfilerule == UnusedSetRule
         && layerrule == UnusedForceRule
-            && adaptivesyncrule == UnusedForceRule);
+        && adaptivesyncrule == UnusedForceRule
+        && tearingrule == UnusedForceRule;
 }
 
 Rules::ForceRule Rules::convertForceRule(int v)
@@ -686,6 +689,7 @@ APPLY_RULE(shortcut, Shortcut, QString)
 APPLY_FORCE_RULE(disableglobalshortcuts, DisableGlobalShortcuts, bool)
 APPLY_RULE(desktopfile, DesktopFile, QString)
 APPLY_FORCE_RULE(adaptivesync, AdaptiveSync, bool)
+APPLY_FORCE_RULE(tearing, Tearing, bool)
 
 #undef APPLY_RULE
 #undef APPLY_FORCE_RULE
@@ -745,6 +749,7 @@ bool Rules::discardUsed(bool withdrawn)
     DISCARD_USED_SET_RULE(desktopfile);
     DISCARD_USED_FORCE_RULE(layer);
     DISCARD_USED_FORCE_RULE(adaptivesync);
+    DISCARD_USED_FORCE_RULE(tearing);
 
     return changed;
 }
@@ -893,6 +898,7 @@ CHECK_FORCE_RULE(DisableGlobalShortcuts, bool)
 CHECK_RULE(DesktopFile, QString)
 CHECK_FORCE_RULE(Layer, Layer)
 CHECK_FORCE_RULE(AdaptiveSync, bool)
+CHECK_FORCE_RULE(Tearing, bool)
 
 #undef CHECK_RULE
 #undef CHECK_FORCE_RULE

src/rules.h

@@ -78,6 +78,7 @@ public:
     QString checkDesktopFile(QString desktopFile, bool init = false) const;
     Layer checkLayer(Layer layer) const;
     bool checkAdaptiveSync(bool adaptivesync) const;
+    bool checkTearing(bool requestsTearing) const;
 
 private:
     MaximizeMode checkMaximizeVert(MaximizeMode mode, bool init) const;
@@ -189,6 +190,7 @@ public:
     bool applyDesktopFile(QString &desktopFile, bool init) const;
     bool applyLayer(enum Layer &layer) const;
     bool applyAdaptiveSync(bool &adaptivesync) const;
+    bool applyTearing(bool &tearing) const;
 
 private:
 #endif
@@ -295,6 +297,8 @@ private:
     SetRule desktopfilerule;
     bool adaptivesync;
     ForceRule adaptivesyncrule;
+    bool tearing;
+    ForceRule tearingrule;
     friend QDebug &operator<<(QDebug &stream, const Rules *);
 };
 

src/rulesettings.kcfg

@@ -450,5 +450,14 @@
       <label>AdaptiveSync rule type</label>
       <default code="true">Rules::UnusedForceRule</default>
     </entry>
+
+    <entry name="tearing" type="Bool">
+      <label>Allow Tearing</label>
+      <default>true</default>
+    </entry>
+    <entry name="tearingrule" type="Int">
+      <label>Tearing rule type</label>
+      <default code="true">Rules::UnusedForceRule</default>
+    </entry>
   </group>
 </kcfg>

src/window.cpp

@@ -4032,6 +4032,11 @@ bool Window::wantsAdaptiveSync() const
     return rules()->checkAdaptiveSync(isFullScreen());
 }
 
+bool Window::wantsTearing(bool tearingRequested) const
+{
+    return rules()->checkTearing(tearingRequested);
+}
+
 /**
  * Returns @c true if the Window can be minimized; otherwise @c false.
  *

src/window.h

@@ -1004,6 +1004,7 @@ public:
     virtual void setFullScreen(bool set);
 
     bool wantsAdaptiveSync() const;
+    bool wantsTearing(bool tearingRequested) const;
 
     QRectF geometryRestore() const;
     void setGeometryRestore(const QRectF &rect);