File highdpi-0007-compile-time-option-for-disabling-high-DPI-scaling.patch of Package libqt5-qtbase.1959

From 62a56adfa6cab1fe1099cfc1be9750276732f35e Mon Sep 17 00:00:00 2001
From: Paul Olav Tvete <paul.tvete@theqtcompany.com>
Date: Mon, 13 Jul 2015 16:25:37 +0200
Subject: [PATCH] Compile-time option for disabling high-DPI scaling

Even if QHighDpiScaling::isActive() returns false, there
is a small overhead from calling functions and multiplying
with 1.0. This change adds a QT_NO_HIGHDPISCALING #ifdef
that replaces all conversion functions with empty inline
functions.

Task-number: QTBUG-46615
Change-Id: Idf85e1700e3adf7f7174c6fa3f5e1d006d74c826
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>
---
 src/gui/kernel/qhighdpiscaling.cpp |  2 ++
 src/gui/kernel/qhighdpiscaling_p.h | 44 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/src/gui/kernel/qhighdpiscaling.cpp b/src/gui/kernel/qhighdpiscaling.cpp
index 19e3045..de586ac 100644
--- a/src/gui/kernel/qhighdpiscaling.cpp
+++ b/src/gui/kernel/qhighdpiscaling.cpp
@@ -43,6 +43,7 @@ QT_BEGIN_NAMESPACE
 
 Q_LOGGING_CATEGORY(lcScaling, "qt.scaling");
 
+#ifndef QT_NO_HIGHDPISCALING
 static const char legacyDevicePixelEnvVar[] = "QT_DEVICE_PIXEL_RATIO";
 static const char scaleFactorEnvVar[] = "QT_SCALE_FACTOR";
 static const char autoScreenEnvVar[] = "QT_AUTO_SCREEN_SCALE_FACTOR";
@@ -317,4 +318,5 @@ QPoint QHighDpiScaling::origin(const QPlatformScreen *platformScreen)
     return platformScreen->geometry().topLeft();
 }
 
+#endif //QT_NO_HIGHDPISCALING
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qhighdpiscaling_p.h b/src/gui/kernel/qhighdpiscaling_p.h
index c79540d..9e33787 100644
--- a/src/gui/kernel/qhighdpiscaling_p.h
+++ b/src/gui/kernel/qhighdpiscaling_p.h
@@ -62,6 +62,7 @@ class QScreen;
 class QPlatformScreen;
 typedef QPair<qreal, qreal> QDpi;
 
+#ifndef QT_NO_HIGHDPISCALING
 class Q_GUI_EXPORT QHighDpiScaling {
 public:
     static void initHighDpiScaling();
@@ -464,7 +465,50 @@ QVector<T> toNativePixels(const QVector<T> &pointValues, const QWindow *window)
 }
 
 } // namespace QHighDpi
+#else // QT_NO_HIGHDPISCALING
+class Q_GUI_EXPORT QHighDpiScaling {
+public:
+    static inline void initHighDpiScaling() {}
+    static inline void updateHighDpiScaling() {}
+    static inline void setGlobalFactor(qreal) {}
+    static inline void setScreenFactor(QScreen *, qreal) {}
+
+    static inline bool isActive() { return false; }
+    static inline qreal factor(const QWindow *) { return 1.0; }
+    static inline qreal factor(const QScreen *) { return 1.0; }
+    static inline qreal factor(const QPlatformScreen *) { return 1.0; }
+    static inline QPoint origin(const QScreen *) { return QPoint(); }
+    static inline QPoint origin(const QPlatformScreen *) { return QPoint(); }
+    static inline QPoint mapPositionFromNative(const QPoint &pos, const QPlatformScreen *) { return pos; }
+    static inline QPoint mapPositionToNative(const QPoint &pos, const QPlatformScreen *) { return pos; }
+    static inline QDpi logicalDpi() { return QDpi(-1,-1); }
+};
 
+namespace QHighDpi {
+    template <typename T> inline
+    T toNative(const T &value, ...) { return value; }
+    template <typename T> inline
+    T fromNative(const T &value, ...) { return value; }
+
+    template <typename T> inline
+    T fromNativeLocalPosition(const T &value, ...) { return value; }
+    template <typename T> inline
+    T toNativeLocalPosition(const T &value, ...) { return value; }
+
+    template <typename T> inline
+    T fromNativeLocalRegion(const T &value, ...) { return value; }
+    template <typename T> inline
+    T toNativeLocalRegion(const T &value, ...) { return value; }
+
+    template <typename T> inline
+    T fromNativeScreenGeometry(const T &value, ...) { return value; }
+
+    template <typename T, typename U> inline
+    T toNativePixels(const T &value, const U*) {return value;}
+    template <typename T, typename U> inline
+    T fromNativePixels(const T &value, const U*) {return value;}
+}
+#endif // QT_NO_HIGHDPISCALING
 QT_END_NAMESPACE
 
 #endif // QHIGHDPISCALING_P_H
-- 
2.6.3