Merge remote-tracking branch 'qt/dev' into dev-highdpi

Conflicts:
	src/gui/kernel/qsimpledrag.cpp
	src/gui/kernel/qwindowsysteminterface.cpp
	src/gui/kernel/qwindowsysteminterface_p.h
	src/plugins/platforms/xcb/qxcbwindow.cpp

Change-Id: Icd887552ade61d6a2b2527383970f7145aa00faf

6 files changed, 195 insertions, 85 deletions

diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp
index 2176a148b0..91e8699472 100644
--- a/src/corelib/global/qglobal.cpp
+++ b/src/corelib/global/qglobal.cpp
@@ -2124,9 +2124,9 @@ const QSysInfo::WinVersion QSysInfo::WindowsVersion = QSysInfo::windowsVersion()
 #    define USE_ETC_OS_RELEASE
 struct QUnixOSVersion
 {
-                                    // from /etc/os-release         older /etc/lsb-release
-    QString productType;            // $ID                          $DISTRIB_ID
-    QString productVersion;         // $VERSION_ID                  $DISTRIB_RELEASE
+                                    // from /etc/os-release         older /etc/lsb-release         // redhat /etc/redhat-release         // debian /etc/debian_version
+    QString productType;            // $ID                          $DISTRIB_ID                    // single line file containing:       // Debian
+    QString productVersion;         // $VERSION_ID                  $DISTRIB_RELEASE               // <Vendor_ID release Version_ID>     // single line file <Release_ID/sid>
     QString prettyName;             // $PRETTY_NAME                 $DISTRIB_DESCRIPTION
 };
 
@@ -2138,24 +2138,32 @@ static QString unquote(const char *begin, const char *end)
     }
     return QString::fromLatin1(begin, end - begin);
 }
-
-static bool readEtcFile(QUnixOSVersion &v, const char *filename,
-                        const QByteArray &idKey, const QByteArray &versionKey, const QByteArray &prettyNameKey)
+static QByteArray getEtcFileContent(const char *filename)
 {
     // we're avoiding QFile here
     int fd = qt_safe_open(filename, O_RDONLY);
     if (fd == -1)
-        return false;
+        return QByteArray();
 
     QT_STATBUF sbuf;
     if (QT_FSTAT(fd, &sbuf) == -1) {
         qt_safe_close(fd);
-        return false;
+        return QByteArray();
     }
 
     QByteArray buffer(sbuf.st_size, Qt::Uninitialized);
     buffer.resize(qt_safe_read(fd, buffer.data(), sbuf.st_size));
     qt_safe_close(fd);
+    return buffer;
+}
+
+static bool readEtcFile(QUnixOSVersion &v, const char *filename,
+                        const QByteArray &idKey, const QByteArray &versionKey, const QByteArray &prettyNameKey)
+{
+
+    QByteArray buffer = getEtcFileContent(filename);
+    if (buffer.isEmpty())
+        return false;
 
     const char *ptr = buffer.constData();
     const char *end = buffer.constEnd();
@@ -2219,14 +2227,72 @@ static bool readEtcLsbRelease(QUnixOSVersion &v)
         }
     }
 
-    return ok;
+    // some distributions have a /etc/lsb-release file that does not provide the values
+    // we are looking for, i.e. DISTRIB_ID, DISTRIB_RELEASE and DISTRIB_DESCRIPTION.
+    // Assuming that neither DISTRIB_ID nor DISTRIB_RELEASE were found, or contained valid values,
+    // returning false for readEtcLsbRelease will allow further /etc/<lowercasename>-release parsing.
+    return ok && !(v.productType.isEmpty() && v.productVersion.isEmpty());
 }
 
+#if defined(Q_OS_LINUX)
+static QByteArray getEtcFileFirstLine(const char *fileName)
+{
+    QByteArray buffer = getEtcFileContent(fileName);
+    if (buffer.isEmpty())
+        return QByteArray();
+
+    const char *ptr = buffer.constData();
+    int eol = buffer.indexOf("\n");
+    return QByteArray(ptr, eol).trimmed();
+}
+
+static bool readEtcRedHatRelease(QUnixOSVersion &v)
+{
+    // /etc/redhat-release analysed should be a one line file
+    // the format of its content is <Vendor_ID release Version>
+    // i.e. "Red Hat Enterprise Linux Workstation release 6.5 (Santiago)"
+    QByteArray line = getEtcFileFirstLine("/etc/redhat-release");
+    if (line.isEmpty())
+        return false;
+
+    v.prettyName = QString::fromLatin1(line);
+
+    const char keyword[] = "release ";
+    int releaseIndex = line.indexOf(keyword);
+    v.productType = QString::fromLatin1(line.mid(0, releaseIndex)).remove(QLatin1Char(' '));
+    int spaceIndex = line.indexOf(' ', releaseIndex + strlen(keyword));
+    v.productVersion = QString::fromLatin1(line.mid(releaseIndex + strlen(keyword), spaceIndex > -1 ? spaceIndex - releaseIndex - strlen(keyword) : -1));
+    return true;
+}
+
+static bool readEtcDebianVersion(QUnixOSVersion &v)
+{
+    // /etc/debian_version analysed should be a one line file
+    // the format of its content is <Release_ID/sid>
+    // i.e. "jessie/sid"
+    QByteArray line = getEtcFileFirstLine("/etc/debian_version");
+    if (line.isEmpty())
+        return false;
+
+    v.productType = QStringLiteral("Debian");
+    v.productVersion = QString::fromLatin1(line);
+    return true;
+}
+#endif
+
 static bool findUnixOsVersion(QUnixOSVersion &v)
 {
     if (readEtcOsRelease(v))
         return true;
-    return readEtcLsbRelease(v);
+    if (readEtcLsbRelease(v))
+        return true;
+#if defined(Q_OS_LINUX)
+    if (readEtcRedHatRelease(v))
+        return true;
+    if (readEtcDebianVersion(v))
+        return true;
+#endif
+    return false;
 }
 #  endif // USE_ETC_OS_RELEASE
 #endif // Q_OS_UNIX
@@ -2955,7 +3021,7 @@ namespace {
     // depending on the return type
     static inline Q_DECL_UNUSED QString fromstrerror_helper(int, const QByteArray &buf)
     {
-        return QString::fromLocal8Bit(buf);
+        return QString::fromLocal8Bit(buf.constData());
     }
     static inline Q_DECL_UNUSED QString fromstrerror_helper(const char *str, const QByteArray &)
     {
diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h
index c4e2f7609c..4eeee0fef4 100644
--- a/src/corelib/global/qglobal.h
+++ b/src/corelib/global/qglobal.h
@@ -322,6 +322,15 @@ typedef double qreal;
 #endif
 
 /*
+   Some classes do not permit copies to be made of an object. These
+   classes contains a private copy constructor and assignment
+   operator to disable copying (the compiler gives an error message).
+*/
+#define Q_DISABLE_COPY(Class) \
+    Class(const Class &) Q_DECL_EQ_DELETE;\
+    Class &operator=(const Class &) Q_DECL_EQ_DELETE;
+
+/*
    No, this is not an evil backdoor. QT_BUILD_INTERNAL just exports more symbols
    for Qt's internal unit tests. If you want slower loading times and more
    symbols that can vanish from version to version, feel free to define QT_BUILD_INTERNAL.
@@ -543,7 +552,21 @@ template <typename T>
 Q_DECL_CONSTEXPR inline const T &qBound(const T &min, const T &val, const T &max)
 { return qMax(min, qMin(max, val)); }
 
-#ifdef Q_OS_DARWIN
+#ifndef Q_FORWARD_DECLARE_OBJC_CLASS
+#  ifdef __OBJC__
+#    define Q_FORWARD_DECLARE_OBJC_CLASS(classname) @class classname
+#  else
+#    define Q_FORWARD_DECLARE_OBJC_CLASS(classname) typedef struct objc_object classname
+#  endif
+#endif
+#ifndef Q_FORWARD_DECLARE_CF_TYPE
+#  define Q_FORWARD_DECLARE_CF_TYPE(type) typedef const struct __ ## type * type ## Ref
+#endif
+#ifndef Q_FORWARD_DECLARE_MUTABLE_CF_TYPE
+#  define Q_FORWARD_DECLARE_MUTABLE_CF_TYPE(type) typedef struct __ ## type * type ## Ref
+#endif
+
+#ifdef Q_OS_MAC
 #  define QT_MAC_PLATFORM_SDK_EQUAL_OR_ABOVE(osx, ios) \
     ((defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && osx != __MAC_NA && __MAC_OS_X_VERSION_MAX_ALLOWED >= osx) || \
      (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && ios != __IPHONE_NA && __IPHONE_OS_VERSION_MAX_ALLOWED >= ios))
@@ -561,7 +584,21 @@ Q_DECL_CONSTEXPR inline const T &qBound(const T &min, const T &val, const T &max
       QT_MAC_DEPLOYMENT_TARGET_BELOW(__MAC_NA, ios)
 #  define QT_OSX_DEPLOYMENT_TARGET_BELOW(osx) \
       QT_MAC_DEPLOYMENT_TARGET_BELOW(osx, __IPHONE_NA)
-#endif
+
+Q_FORWARD_DECLARE_OBJC_CLASS(NSAutoreleasePool);
+
+// Implemented in qcore_mac_objc.mm
+class Q_CORE_EXPORT QMacAutoReleasePool
+{
+public:
+    QMacAutoReleasePool();
+    ~QMacAutoReleasePool();
+private:
+    Q_DISABLE_COPY(QMacAutoReleasePool);
+    NSAutoreleasePool *pool;
+};
+
+#endif // Q_OS_MAC
 
 /*
    Data stream functions are provided by many classes (defined in qdatastream.h)
@@ -1033,15 +1070,6 @@ Q_CORE_EXPORT QString qtTrId(const char *id, int n = -1);
   { return T::dynamic_cast_will_always_fail_because_rtti_is_disabled; }
 #endif
 
-/*
-   Some classes do not permit copies to be made of an object. These
-   classes contains a private copy constructor and assignment
-   operator to disable copying (the compiler gives an error message).
-*/
-#define Q_DISABLE_COPY(Class) \
-    Class(const Class &) Q_DECL_EQ_DELETE;\
-    Class &operator=(const Class &) Q_DECL_EQ_DELETE;
-
 class QByteArray;
 Q_CORE_EXPORT QByteArray qgetenv(const char *varName);
 Q_CORE_EXPORT bool qputenv(const char *varName, const QByteArray& value);
@@ -1062,9 +1090,10 @@ Q_CORE_EXPORT int qrand();
 
 #define QT_MODULE(x)
 
-#if !defined(QT_BOOTSTRAPPED) && defined(QT_REDUCE_RELOCATIONS) && defined(__ELF__) && !defined(__PIC__) && !defined(__PIE__)
+#if !defined(QT_BOOTSTRAPPED) && defined(QT_REDUCE_RELOCATIONS) && defined(__ELF__) && \
+    (!defined(__PIC__) || (defined(__PIE__) && defined(Q_CC_GNU) && Q_CC_GNU >= 500))
 #  error "You must build your code with position independent code if Qt was built with -reduce-relocations. "\
-         "Compile your code with -fPIC or -fPIE."
+         "Compile your code with -fPIC (-fPIE is not enough)."
 #endif
 
 namespace QtPrivate {
@@ -1076,20 +1105,6 @@ template <bool B, typename T, typename F> struct QConditional { typedef T Type;
 template <typename T, typename F> struct QConditional<false, T, F> { typedef F Type; };
 }
 
-#ifndef Q_FORWARD_DECLARE_OBJC_CLASS
-#  ifdef __OBJC__
-#    define Q_FORWARD_DECLARE_OBJC_CLASS(classname) @class classname
-#  else
-#    define Q_FORWARD_DECLARE_OBJC_CLASS(classname) typedef struct objc_object classname
-#  endif
-#endif
-#ifndef Q_FORWARD_DECLARE_CF_TYPE
-#  define Q_FORWARD_DECLARE_CF_TYPE(type) typedef const struct __ ## type * type ## Ref
-#endif
-#ifndef Q_FORWARD_DECLARE_MUTABLE_CF_TYPE
-#  define Q_FORWARD_DECLARE_MUTABLE_CF_TYPE(type) typedef struct __ ## type * type ## Ref
-#endif
-
 QT_END_NAMESPACE
 
 // We need to keep QTypeInfo, QSysInfo, QFlags, qDebug & family in qglobal.h for compatibility with Qt 4.
diff --git a/src/corelib/global/qlogging.cpp b/src/corelib/global/qlogging.cpp
index d9d21c535c..88882bbe8f 100644
--- a/src/corelib/global/qlogging.cpp
+++ b/src/corelib/global/qlogging.cpp
@@ -972,8 +972,8 @@ struct QMessagePattern {
     QElapsedTimer timer;
 #endif
 #ifdef QLOGGING_HAVE_BACKTRACE
-    int backtraceDepth;
     QString backtraceSeparator;
+    int backtraceDepth;
 #endif
 
     bool fromEnvironment;
@@ -986,8 +986,8 @@ QMessagePattern::QMessagePattern()
     : literals(0)
     , tokens(0)
 #ifdef QLOGGING_HAVE_BACKTRACE
-    , backtraceDepth(5)
     , backtraceSeparator(QLatin1Char('|'))
+    , backtraceDepth(5)
 #endif
     , fromEnvironment(false)
 {
@@ -1737,7 +1737,7 @@ void qErrnoWarning(int code, const char *msg, ...)
 
     Example:
     \code
-    QT_MESSAGE_PATTERN="[%{time yyyyMMdd h:mm:ss.zzz t} %{if-debug}D{%endif}%{if-info}I%{endif}%{if-warning}W%{endif}%{if-critical}C%{endif}%{if-fatal}F%{endif}] %{file}:%{line} - %{message}"
+    QT_MESSAGE_PATTERN="[%{time yyyyMMdd h:mm:ss.zzz t} %{if-debug}D%{endif}%{if-info}I%{endif}%{if-warning}W%{endif}%{if-critical}C%{endif}%{if-fatal}F%{endif}] %{file}:%{line} - %{message}"
     \endcode
 
     The default \a pattern is "%{if-category}%{category}: %{endif}%{message}".
diff --git a/src/corelib/global/qnamespace.h b/src/corelib/global/qnamespace.h
index 123e2edf0e..fc5207fa25 100644
--- a/src/corelib/global/qnamespace.h
+++ b/src/corelib/global/qnamespace.h
@@ -294,10 +294,13 @@ public:
         WindowCloseButtonHint = 0x08000000,
         MacWindowToolBarButtonHint = 0x10000000,
         BypassGraphicsProxyWidget = 0x20000000,
-        WindowOkButtonHint = 0x00080000,
-        WindowCancelButtonHint = 0x00100000,
         NoDropShadowWindowHint = 0x40000000,
-        WindowFullscreenButtonHint = 0x80000000
+        WindowFullscreenButtonHint = 0x80000000,
+
+        // The following enums have overlapping values with other enums.
+        // This was not intentional, but it's too late to change now.
+        WindowOkButtonHint = 0x00080000, // WindowTransparentForInput
+        WindowCancelButtonHint = 0x00100000 // WindowOverridesSystemGestures
     };
 
     Q_DECLARE_FLAGS(WindowFlags, WindowType)
@@ -1323,7 +1326,7 @@ public:
         ImAbsolutePosition = 0x400,
         ImTextBeforeCursor = 0x800,
         ImTextAfterCursor = 0x1000,
-        ImReturnKeyType = 0x2000,
+        ImEnterKeyType = 0x2000,
 
         ImPlatformData = 0x80000000,
         ImQueryInput = ImCursorRectangle | ImCursorPosition | ImSurroundingText |
@@ -1363,15 +1366,15 @@ public:
     };
     Q_DECLARE_FLAGS(InputMethodHints, InputMethodHint)
 
-    enum ReturnKeyType {
-        ReturnKeyDefault,
-        ReturnKeyEnter,
-        ReturnKeyDone,
-        ReturnKeyGo,
-        ReturnKeySend,
-        ReturnKeySearch,
-        ReturnKeyNext,
-        ReturnKeyPrevious
+    enum EnterKeyType {
+        EnterKeyDefault,
+        EnterKeyReturn,
+        EnterKeyDone,
+        EnterKeyGo,
+        EnterKeySend,
+        EnterKeySearch,
+        EnterKeyNext,
+        EnterKeyPrevious
     };
 
     enum ToolButtonStyle {
@@ -1697,7 +1700,7 @@ public:
     QT_Q_ENUM(InputMethodHint)
     QT_Q_ENUM(InputMethodQuery)
     QT_Q_FLAG(InputMethodHints)
-    QT_Q_ENUM(ReturnKeyType)
+    QT_Q_ENUM(EnterKeyType)
     QT_Q_FLAG(InputMethodQueries)
     QT_Q_FLAG(TouchPointStates)
     QT_Q_ENUM(ScreenOrientation)
diff --git a/src/corelib/global/qnamespace.qdoc b/src/corelib/global/qnamespace.qdoc
index d4d7b631ad..970e1b1f42 100644
--- a/src/corelib/global/qnamespace.qdoc
+++ b/src/corelib/global/qnamespace.qdoc
@@ -2527,7 +2527,7 @@
                                 but \b{must} not return an empty string unless the cursor is at the start of the document.
     \value ImTextAfterCursor    The plain text after the cursor. The widget can decide how much text to return,
                                 but \b{must} not return an empty string unless the cursor is at the end of the document.
-    \value ImReturnKeyType      The return key type.
+    \value ImEnterKeyType       The Enter key type.
 
     Masks:
 
@@ -2538,31 +2538,32 @@
 */
 
 /*!
-    \enum Qt::ReturnKeyType
+    \enum Qt::EnterKeyType
 
     This can be used to alter the appearance of the Return key on an on screen keyboard.
 
-    Note that not all of these values are supported on all platforms.
-
-    \value ReturnKeyDefault     The default return key.
-                                This can either be a button closing the keyboard, or a Return button
-                                causing a new line in case of a multi-line input field.
-    \value ReturnKeyEnter       Show a Return button that inserts a new line.
-                                The keyboard will not close when this button is pressed.
-    \value ReturnKeyDone        Show a "Done" button.
-                                The keyboard will close when this button is pressed.
-    \value ReturnKeyGo          Show a "Go" button.
-                                Typically used in an address bar when entering an URL; the keyboard
-                                will close when this button is pressed.
-    \value ReturnKeySend        Show a "Send" button.
-                                The keyboard will close when this button is pressed.
-    \value ReturnKeySearch      Show a "Search" button.
-                                The keyboard will close when this button is pressed.
-    \value ReturnKeyNext        Show a "Next" button.
-                                Typically used in a form to allow navigating to the next input field;
-                                the keyboard will not close when this button is pressed.
-    \value ReturnKeyPrevious    Show a "Previous" button.
-                                The keyboard will not close when this button is pressed.
+    \note Not all of these values are supported on all platforms.
+    For unsuppoted values the default key will be used instead.
+
+    \value EnterKeyDefault     The default Enter key.
+                               This can either be a button closing the keyboard, or a Return button
+                               causing a new line in case of a multi-line input field.
+    \value EnterKeyReturn      Show a Return button that inserts a new line.
+                               The keyboard will not close when this button is pressed.
+    \value EnterKeyDone        Show a "Done" button.
+                               The keyboard will close when this button is pressed.
+    \value EnterKeyGo          Show a "Go" button.
+                               Typically used in an address bar when entering a URL; the keyboard
+                               will close when this button is pressed.
+    \value EnterKeySend        Show a "Send" button.
+                               The keyboard will close when this button is pressed.
+    \value EnterKeySearch      Show a "Search" button.
+                               The keyboard will close when this button is pressed.
+    \value EnterKeyNext        Show a "Next" button.
+                               Typically used in a form to allow navigating to the next input field;
+                               the keyboard will not close when this button is pressed.
+    \value EnterKeyPrevious    Show a "Previous" button.
+                               The keyboard will not close when this button is pressed.
 
     \since 5.6
 */
@@ -2955,15 +2956,19 @@
     \enum Qt::NativeGestureType
     \since 5.2
 
-    \value BeginNativeGesture
-    \value EndNativeGesture
-    \value PanNativeGesture
-    \value ZoomNativeGesture
-    \value SmartZoomNativeGesture
-    \value RotateNativeGesture
-    \value SwipeNativeGesture
+    This enum returns the gesture type.
+
+    \value BeginNativeGesture Sent before gesture event stream.
+    \value EndNativeGesture   Sent after gesture event stream.
+    \value PanNativeGesture   Sent after a panning gesture.
+                              Similar to a click-and-drag mouse movement.
+    \value ZoomNativeGesture  Specifies the magnification delta in percent.
+    \value SmartZoomNativeGesture Boolean magnification state.
+    \value RotateNativeGesture    Rotation delta in degrees.
+    \value SwipeNativeGesture     Sent after a swipe movements.
 
 */
+
 /*!
     \enum Qt::NavigationMode
     \since 4.6
diff --git a/src/corelib/global/qtypetraits.h b/src/corelib/global/qtypetraits.h
index 3a305713e6..488e257e0f 100644
--- a/src/corelib/global/qtypetraits.h
+++ b/src/corelib/global/qtypetraits.h
@@ -506,6 +506,27 @@ Q_STATIC_ASSERT((!is_unsigned<qint64>::value));
 Q_STATIC_ASSERT((!is_signed<quint64>::value));
 Q_STATIC_ASSERT(( is_signed<qint64>::value));
 
+template<class T = void> struct is_default_constructible;
+
+template<> struct is_default_constructible<void>
+{
+protected:
+    template<bool> struct test { typedef char type; };
+public:
+    static bool const value = false;
+};
+template<> struct is_default_constructible<>::test<true> { typedef double type; };
+
+template<class T> struct is_default_constructible : is_default_constructible<>
+{
+private:
+    template<class U> static typename test<!!sizeof(::new U())>::type sfinae(U*);
+    template<class U> static char sfinae(...);
+public:
+    static bool const value = sizeof(sfinae<T>(0)) > 1;
+};
+
+
 } // namespace QtPrivate
 
 QT_END_NAMESPACE