Fix QT issue on MacOS version 11.0 "Big Sur".

ChangeLog.txt

@@ -15,6 +15,7 @@
 - New option. Default piece label template for new pieces.
 - Shortcut to quickly enable/disable Interactive tools mode.
 - Improve labels for V notch.
+- Fix QT issue on MacOS version 11.0 "Big Sur".
 
 # Valentina 0.7.52 September 12, 2022
 - Fix crash when default locale is ru.

src/app/puzzle/main.cpp

@@ -69,7 +69,13 @@ auto main(int argc, char *argv[]) -> int
 
 #ifndef Q_OS_MAC // supports natively
     InitHighDpiScaling(argc, argv);
-#endif //Q_OS_MAC
+#endif //ndef Q_OS_MAC
+
+#ifdef Q_OS_MAC
+#if MACOS_LAYER_BACKING_AFFECTED
+    MacosEnableLayerBacking();
+#endif // MACOS_LAYER_BACKING_AFFECTED
+#endif // Q_OS_MAC
 
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     XERCES_CPP_NAMESPACE::XMLPlatformUtils::Initialize();

src/app/tape/main.cpp

@@ -75,6 +75,12 @@ auto main(int argc, char *argv[]) -> int
     InitHighDpiScaling(argc, argv);
 #endif //Q_OS_MAC
 
+#ifdef Q_OS_MAC
+#if MACOS_LAYER_BACKING_AFFECTED
+    MacosEnableLayerBacking();
+#endif // MACOS_LAYER_BACKING_AFFECTED
+#endif // Q_OS_MAC
+
     MApplication app(argc, argv);
     app.InitOptions();
 

src/app/valentina/main.cpp

@@ -81,6 +81,12 @@ auto main(int argc, char *argv[]) -> int
     InitHighDpiScaling(argc, argv);
 #endif //Q_OS_MAC
 
+#ifdef Q_OS_MAC
+#if MACOS_LAYER_BACKING_AFFECTED
+    MacosEnableLayerBacking();
+#endif // MACOS_LAYER_BACKING_AFFECTED
+#endif // Q_OS_MAC
+
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     XERCES_CPP_NAMESPACE::XMLPlatformUtils::Initialize();
 

src/libs/vmisc/def.cpp

@@ -304,6 +304,22 @@ void InitHighDpiScaling(int argc, char *argv[])
     }
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+#ifdef Q_OS_MAC
+#if MACOS_LAYER_BACKING_AFFECTED
+void MacosEnableLayerBacking()
+{
+    QOperatingSystemVersion osVer = QOperatingSystemVersion::current();
+    const int majorVer = osVer.majorVersion();
+    const int minorVer = osVer.minorVersion();
+    if (((majorVer == 10 && minorVer >= 16) || majorVer >= 11) && qEnvironmentVariableIsEmpty("QT_MAC_WANTS_LAYER"))
+    {
+        qputenv("QT_MAC_WANTS_LAYER", "1");
+    }
+}
+#endif // MACOS_LAYER_BACKING_AFFECTED
+#endif // Q_OS_MAC
+
 Q_GLOBAL_STATIC_WITH_ARGS(const QString, strTMark, (QLatin1String("tMark"))) // NOLINT
 Q_GLOBAL_STATIC_WITH_ARGS(const QString, strVMark, (QLatin1String("vMark"))) // NOLINT
 Q_GLOBAL_STATIC_WITH_ARGS(const QString, strVMark2, (QLatin1String("vMark2"))) // NOLINT

src/libs/vmisc/def.h

@@ -370,6 +370,35 @@ if (!(cond))                                            \
 bool IsOptionSet(int argc, char *argv[], const char *option);
 void InitHighDpiScaling(int argc, char *argv[]);
 
+#ifdef Q_OS_MAC
+// Fix QT issue on MacOS version 11.0 "Big Sur"
+//     https://bugreports.qt.io/browse/QTBUG-87014
+// Enables layer backing for Big Sur
+// Prevents 100% CPU & RAM utilization
+//
+// The fix at
+//
+//     https://codereview.qt-project.org/c/qt/qtbase/+/322228/3/src/plugins/platforms/cocoa/qnsview_drawing.mm
+//
+// enables layer backing if we're running on Big Sur OR we're running on
+// Catalina AND we were built with the Catalina SDK. Enable layer backing
+// here by setting QT_MAC_WANTS_LAYER=1, but only if we're running on Big
+// Sur and our version of Qt doesn't have a fix for QTBUG-87014.
+
+// We'll assume that it will be fixed in 5.12.11, 5.15.3, and 6.0.1.
+// Feel free to add other versions if needed.
+#define MACOS_LAYER_BACKING_AFFECTED \
+(QT_VERSION >= QT_VERSION_CHECK(5, 12, 0) && QT_VERSION < QT_VERSION_CHECK(5, 12, 11) \
+ || (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0) &&  QT_VERSION < QT_VERSION_CHECK(5, 15, 3)) \
+ || (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0) &&  QT_VERSION < QT_VERSION_CHECK(6, 0, 1)) \
+ )
+
+#if MACOS_LAYER_BACKING_AFFECTED
+#include <QOperatingSystemVersion>
+void MacosEnableLayerBacking();
+#endif // MACOS_LAYER_BACKING_AFFECTED
+#endif // Q_OS_MAC
+
 // Don't forget to syncronize with XSD schema.
 const int userMaterialPlaceholdersQuantity = 20;