Merge remote branch 'staging/master' into refactor

Conflicts:
	src/opengl/qgl_qpa.cpp
	src/plugins/platforms/glxconvenience/qglxconvenience.cpp
	src/plugins/platforms/platforms.pro
	src/plugins/platforms/wayland/qwaylandwindow.cpp
	src/plugins/platforms/xcb/qxcbwindow.cpp
	src/plugins/platforms/xcb/qxcbwindow.h
	src/plugins/platforms/xcb/qxcbwindowsurface.cpp
	src/widgets/kernel/qwidget_qpa.cpp
	tests/auto/qvariant/tst_qvariant.cpp

48 files changed, 631 insertions, 111 deletions

diff --git a/src/corelib/tools/qbytearray.h b/src/corelib/tools/qbytearray.h
index 0627b4e568..df58d95131 100644
--- a/src/corelib/tools/qbytearray.h
+++ b/src/corelib/tools/qbytearray.h
@@ -57,9 +57,10 @@
 #  ifdef QT_USE_FAST_OPERATOR_PLUS
 #    undef QT_USE_FAST_OPERATOR_PLUS
 #  endif
-#  ifdef QT_USE_FAST_CONCATENATION
-#    undef QT_USE_FAST_CONCATENATION
+#  ifdef QT_USE_QSTRINGBUILDER
+#    undef QT_USE_QSTRINGBUILDER
 #  endif
+
 #endif
 
 
@@ -559,8 +560,7 @@ inline bool operator>=(const QByteArray &a1, const char *a2)
 { return qstrcmp(a1, a2) >= 0; }
 inline bool operator>=(const char *a1, const QByteArray &a2)
 { return qstrcmp(a1, a2) >= 0; }
-#ifndef QT_USE_FAST_OPERATOR_PLUS
-# ifndef QT_USE_FAST_CONCATENATION
+#if !defined(QT_USE_QSTRINGBUILDER)
 inline const QByteArray operator+(const QByteArray &a1, const QByteArray &a2)
 { return QByteArray(a1) += a2; }
 inline const QByteArray operator+(const QByteArray &a1, const char *a2)
@@ -571,8 +571,7 @@ inline const QByteArray operator+(const char *a1, const QByteArray &a2)
 { return QByteArray(a1) += a2; }
 inline const QByteArray operator+(char a1, const QByteArray &a2)
 { return QByteArray(&a1, 1) += a2; }
-# endif // QT_USE_FAST_CONCATENATION
-#endif // QT_USE_FAST_OPERATOR_PLUS
+#endif // QT_USE_QSTRINGBUILDER
 inline QBool QByteArray::contains(const char *c) const
 { return QBool(indexOf(c) != -1); }
 inline QByteArray &QByteArray::replace(char before, const char *c)
@@ -615,7 +614,7 @@ QT_END_NAMESPACE
 
 QT_END_HEADER
 
-#ifdef QT_USE_FAST_CONCATENATION
+#ifdef QT_USE_QSTRINGBUILDER
 #include <QtCore/qstring.h>
 #endif
 
diff --git a/src/corelib/tools/qstring.cpp b/src/corelib/tools/qstring.cpp
index 5493ba915b..3b3f715b9d 100644
--- a/src/corelib/tools/qstring.cpp
+++ b/src/corelib/tools/qstring.cpp
@@ -777,16 +777,12 @@ const QString::Null QString::null = { };
 
     \snippet doc/src/snippets/qstring/stringbuilder.cpp 5
 
-    A more global approach is to include this define:
+    A more global approach which is the most convenient but
+    not entirely source compatible, is to this define in your
+    .pro file:
 
     \snippet doc/src/snippets/qstring/stringbuilder.cpp 3
 
-    and use \c{'%'} instead of \c{'+'} for string concatenation
-    everywhere. The third approach, which is the most convenient but
-    not entirely source compatible, is to include two defines:
-
-    \snippet doc/src/snippets/qstring/stringbuilder.cpp 4
-
     and the \c{'+'} will automatically be performed as the
     \c{QStringBuilder} \c{'%'} everywhere.
 
diff --git a/src/corelib/tools/qstring.h b/src/corelib/tools/qstring.h
index 6418a8cbd4..7c4367efde 100644
--- a/src/corelib/tools/qstring.h
+++ b/src/corelib/tools/qstring.h
@@ -1016,8 +1016,7 @@ inline int QByteArray::findRev(const QString &s, int from) const
 #  endif // QT3_SUPPORT
 #endif // QT_NO_CAST_TO_ASCII
 
-#ifndef QT_USE_FAST_OPERATOR_PLUS
-# ifndef QT_USE_FAST_CONCATENATION
+#if !defined(QT_USE_FAST_OPERATOR_PLUS) && !defined(QT_USE_QSTRINGBUILDER)
 inline const QString operator+(const QString &s1, const QString &s2)
 { QString t(s1); t += s2; return t; }
 inline const QString operator+(const QString &s1, QChar s2)
@@ -1038,8 +1037,7 @@ inline QT_ASCII_CAST_WARN const QString operator+(const QByteArray &ba, const QS
 inline QT_ASCII_CAST_WARN const QString operator+(const QString &s, const QByteArray &ba)
 { QString t(s); t += QString::fromAscii(ba.constData(), qstrnlen(ba.constData(), ba.size())); return t; }
 #  endif // QT_NO_CAST_FROM_ASCII
-# endif // QT_USE_FAST_CONCATENATION
-#endif // QT_USE_FAST_OPERATOR_PLUS
+#endif // QT_USE_QSTRINGBUILDER
 
 #ifndef QT_NO_STL
 inline std::string QString::toStdString() const
@@ -1288,7 +1286,7 @@ QT_END_NAMESPACE
 
 QT_END_HEADER
 
-#ifdef QT_USE_FAST_CONCATENATION
+#if defined(QT_USE_FAST_OPERATOR_PLUS) || defined(QT_USE_QSTRINGBUILDER)
 #include <QtCore/qstringbuilder.h>
 #endif
 
diff --git a/src/corelib/tools/qstringbuilder.h b/src/corelib/tools/qstringbuilder.h
index 2d3475fed9..029aa0b216 100644
--- a/src/corelib/tools/qstringbuilder.h
+++ b/src/corelib/tools/qstringbuilder.h
@@ -410,7 +410,9 @@ operator%(const A &a, const B &b)
    return QStringBuilder<typename QConcatenable<A>::type, typename QConcatenable<B>::type>(a, b);
 }
 
-#ifdef QT_USE_FAST_OPERATOR_PLUS
+// QT_USE_FAST_OPERATOR_PLUS was introduced in 4.7, QT_USE_QSTRINGBUILDER is to be used from 4.8 onwards
+// QT_USE_FAST_OPERATOR_PLUS does not remove the normal operator+ for QByteArray
+#if defined(QT_USE_FAST_OPERATOR_PLUS) || defined(QT_USE_QSTRINGBUILDER)
 template <typename A, typename B>
 QStringBuilder<typename QConcatenable<A>::type, typename QConcatenable<B>::type>
 operator+(const A &a, const B &b)
diff --git a/src/gui/painting/qcolor.cpp b/src/gui/painting/qcolor.cpp
index 1a6b090f63..1f342aeef7 100644
--- a/src/gui/painting/qcolor.cpp
+++ b/src/gui/painting/qcolor.cpp
@@ -532,8 +532,7 @@ QString QColor::name() const
 
 void QColor::setNamedColor(const QString &name)
 {
-    if (!setColorFromString(name))
-        qWarning("QColor::setNamedColor: Unknown color name '%s'", name.toLatin1().constData());
+    setColorFromString(name);
 }
 
 /*!
diff --git a/src/gui/painting/qdrawhelper_neon.cpp b/src/gui/painting/qdrawhelper_neon.cpp
index e673dd9861..a098e82e19 100644
--- a/src/gui/painting/qdrawhelper_neon.cpp
+++ b/src/gui/painting/qdrawhelper_neon.cpp
@@ -986,7 +986,7 @@ public:
 
     static inline Int32x4 v_toInt(Float32x4 x) { return vcvtq_s32_f32(x); }
 
-    static inline Int32x4 v_greaterOrEqual(Float32x4 a, Float32x4 b) { return vcge_f32(a, b); }
+    static inline Int32x4 v_greaterOrEqual(Float32x4 a, Float32x4 b) { return vreinterpretq_s32_u32(vcgeq_f32(a, b)); }
 };
 
 const uint * QT_FASTCALL qt_fetch_radial_gradient_neon(uint *buffer, const Operator *op, const QSpanData *data,
diff --git a/src/gui/painting/qpaintengine_raster.cpp b/src/gui/painting/qpaintengine_raster.cpp
index 8b7883bc58..2cc8863091 100644
--- a/src/gui/painting/qpaintengine_raster.cpp
+++ b/src/gui/painting/qpaintengine_raster.cpp
@@ -3008,8 +3008,16 @@ void QRasterPaintEngine::drawStaticTextItem(QStaticTextItem *textItem)
     ensurePen();
     ensureState();
 
-    drawCachedGlyphs(textItem->numGlyphs, textItem->glyphs, textItem->glyphPositions,
-                     textItem->fontEngine());
+    QRasterPaintEngineState *s = state();
+
+    QFontEngine *fontEngine = textItem->fontEngine();
+    const qreal pixelSize = fontEngine->fontDef.pixelSize;
+    if (pixelSize * pixelSize * qAbs(s->matrix.determinant()) < 64 * 64) {
+        drawCachedGlyphs(textItem->numGlyphs, textItem->glyphs, textItem->glyphPositions,
+                         fontEngine);
+    } else {
+        QPaintEngineEx::drawStaticTextItem(textItem);
+    }
 }
 
 /*!
diff --git a/src/gui/painting/qpaintengineex.cpp b/src/gui/painting/qpaintengineex.cpp
index bbdf76f0c0..304e5fc486 100644
--- a/src/gui/painting/qpaintengineex.cpp
+++ b/src/gui/painting/qpaintengineex.cpp
@@ -44,6 +44,8 @@
 #include "qstroker_p.h"
 #include "qbezier_p.h"
 #include <private/qpainterpath_p.h>
+#include <private/qfontengine_p.h>
+#include <private/qstatictext_p.h>
 
 #include <qvarlengtharray.h>
 #include <qdebug.h>
@@ -1057,5 +1059,38 @@ Q_GUI_EXPORT QPainterPath qt_painterPathFromVectorPath(const QVectorPath &path)
     return p;
 }
 
+void QPaintEngineEx::drawStaticTextItem(QStaticTextItem *staticTextItem)
+{
+    QPainterPath path;
+#ifndef Q_WS_MAC
+    path.setFillRule(Qt::WindingFill);
+#endif
+
+    if (staticTextItem->numGlyphs == 0)
+        return;
+
+    QFontEngine *fontEngine = staticTextItem->fontEngine();
+    fontEngine->addGlyphsToPath(staticTextItem->glyphs, staticTextItem->glyphPositions,
+                                staticTextItem->numGlyphs, &path, 0);
+    if (!path.isEmpty()) {
+        QPainterState *s = state();
+        QPainter::RenderHints oldHints = s->renderHints;
+        bool changedHints = false;
+        if (bool(oldHints & QPainter::TextAntialiasing)
+            && !bool(fontEngine->fontDef.styleStrategy & QFont::NoAntialias)
+            && !bool(oldHints & QPainter::Antialiasing)) {
+            s->renderHints |= QPainter::Antialiasing;
+            renderHintsChanged();
+            changedHints = true;
+        }
+
+        fill(qtVectorPathForPath(path), staticTextItem->color);
+
+        if (changedHints) {
+            s->renderHints = oldHints;
+            renderHintsChanged();
+        }
+    }
+}
 
 QT_END_NAMESPACE
diff --git a/src/gui/painting/qpaintengineex_p.h b/src/gui/painting/qpaintengineex_p.h
index da469936fc..39f872a27c 100644
--- a/src/gui/painting/qpaintengineex_p.h
+++ b/src/gui/painting/qpaintengineex_p.h
@@ -201,7 +201,7 @@ public:
 
     virtual void updateState(const QPaintEngineState &state);
 
-    virtual void drawStaticTextItem(QStaticTextItem *) = 0;
+    virtual void drawStaticTextItem(QStaticTextItem *);
 
     virtual void setState(QPainterState *s);
     inline QPainterState *state() { return static_cast<QPainterState *>(QPaintEngine::state); }
diff --git a/src/gui/text/qfontengine_ft.cpp b/src/gui/text/qfontengine_ft.cpp
index 4dae2a3784..855eaec8c4 100644
--- a/src/gui/text/qfontengine_ft.cpp
+++ b/src/gui/text/qfontengine_ft.cpp
@@ -795,7 +795,7 @@ int QFontEngineFT::loadFlags(QGlyphSet *set, GlyphFormat format, int flags,
     if (set && set->outline_drawing)
         load_flags = FT_LOAD_NO_BITMAP;
 
-    if (default_hint_style == HintNone || (flags & HB_ShaperFlag_UseDesignMetrics))
+    if (default_hint_style == HintNone || (flags & HB_ShaperFlag_UseDesignMetrics) || set->outline_drawing)
         load_flags |= FT_LOAD_NO_HINTING;
     else
         load_flags |= load_target;
diff --git a/src/network/kernel/qhostaddress.cpp b/src/network/kernel/qhostaddress.cpp
index ae7d7a1486..4e7c286d80 100644
--- a/src/network/kernel/qhostaddress.cpp
+++ b/src/network/kernel/qhostaddress.cpp
@@ -720,7 +720,8 @@ Q_IPV6ADDR QHostAddress::toIPv6Address() const
     Returns the address as a string.
 
     For example, if the address is the IPv4 address 127.0.0.1, the
-    returned string is "127.0.0.1".
+    returned string is "127.0.0.1". For IPv6 the string format will 
+    follow the RFC5952 recommendation.
 
     \sa toIPv4Address()
 */
@@ -741,8 +742,32 @@ QString QHostAddress::toString() const
             ugle[i] = (quint16(d->a6[2*i]) << 8) | quint16(d->a6[2*i+1]);
         }
         QString s;
-        s.sprintf("%X:%X:%X:%X:%X:%X:%X:%X",
-                  ugle[0], ugle[1], ugle[2], ugle[3], ugle[4], ugle[5], ugle[6], ugle[7]);
+        QString temp;
+        bool zeroDetected = false;
+        bool zeroShortened = false;
+        for (int i = 0; i < 8; i++) {
+            if ((ugle[i] != 0) || zeroShortened) {
+                temp.sprintf("%X", ugle[i]);
+                s.append(temp);
+                if (zeroDetected)
+                    zeroShortened = true;
+            } else {
+                if (!zeroDetected) {
+                    if (i<7 && (ugle[i+1] == 0)) {
+                        s.append(QLatin1Char(':'));
+                        zeroDetected = true;
+                    } else {
+                        temp.sprintf("%X", ugle[i]);
+                        s.append(temp);
+                        if (i<7)
+                            s.append(QLatin1Char(':'));
+                    }
+                }
+            }
+            if (i<7 && ((ugle[i] != 0) || zeroShortened || (i==0 && zeroDetected)))
+                s.append(QLatin1Char(':'));
+        }
+
         if (!d->scopeId.isEmpty())
             s.append(QLatin1Char('%') + d->scopeId);
         return s;
diff --git a/src/network/kernel/qnetworkinterface_unix.cpp b/src/network/kernel/qnetworkinterface_unix.cpp
index 6098bdeee0..7f251a782b 100644
--- a/src/network/kernel/qnetworkinterface_unix.cpp
+++ b/src/network/kernel/qnetworkinterface_unix.cpp
@@ -219,7 +219,7 @@ static QNetworkInterfacePrivate *findInterface(int socket, QList<QNetworkInterfa
 #ifdef SIOCGIFHWADDR
         // Get the HW address
         if (qt_safe_ioctl(socket, SIOCGIFHWADDR, &req) >= 0) {
-            uchar *addr = (uchar *)&req.ifr_addr;
+            uchar *addr = (uchar *)req.ifr_addr.sa_data;
             iface->hardwareAddress = iface->makeHwAddress(6, addr);
         }
 #endif
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
index f702f13359..fa8b0d0612 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
@@ -1436,19 +1436,30 @@ void QGL2PaintEngineEx::drawStaticTextItem(QStaticTextItem *textItem)
 
     ensureActive();
 
-    QFontEngineGlyphCache::Type glyphType = textItem->fontEngine()->glyphFormat >= 0
-                                            ? QFontEngineGlyphCache::Type(textItem->fontEngine()->glyphFormat)
-                                            : d->glyphCacheType;
-    if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) {
-        if (d->device->alphaRequested() || state()->matrix.type() > QTransform::TxTranslate
-            || (state()->composition_mode != QPainter::CompositionMode_Source
-            && state()->composition_mode != QPainter::CompositionMode_SourceOver))
-        {
-            glyphType = QFontEngineGlyphCache::Raster_A8;
+    QPainterState *s = state();
+    float det = s->matrix.determinant();
+
+    // don't try to cache huge fonts or vastly transformed fonts
+    QFontEngine *fontEngine = textItem->fontEngine();
+    const qreal pixelSize = fontEngine->fontDef.pixelSize;
+    if (pixelSize * pixelSize * qAbs(det) < QT_MAX_CACHED_GLYPH_SIZE * QT_MAX_CACHED_GLYPH_SIZE ||
+        det < 0.25f || det > 4.f) {
+        QFontEngineGlyphCache::Type glyphType = fontEngine->glyphFormat >= 0
+                                                ? QFontEngineGlyphCache::Type(textItem->fontEngine()->glyphFormat)
+                                                : d->glyphCacheType;
+        if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) {
+            if (d->device->alphaRequested() || s->matrix.type() > QTransform::TxTranslate
+                || (s->composition_mode != QPainter::CompositionMode_Source
+                && s->composition_mode != QPainter::CompositionMode_SourceOver))
+            {
+                glyphType = QFontEngineGlyphCache::Raster_A8;
+            }
         }
-    }
 
-    d->drawCachedGlyphs(glyphType, textItem);
+        d->drawCachedGlyphs(glyphType, textItem);
+    } else {
+        QPaintEngineEx::drawStaticTextItem(textItem);
+    }
 }
 
 bool QGL2PaintEngineEx::drawTexture(const QRectF &dest, GLuint textureId, const QSize &size, const QRectF &src)
diff --git a/src/opengl/qgl_qpa.cpp b/src/opengl/qgl_qpa.cpp
index 5eaaee9702..9c3d4246ae 100644
--- a/src/opengl/qgl_qpa.cpp
+++ b/src/opengl/qgl_qpa.cpp
@@ -83,21 +83,21 @@ QGLFormat QGLFormat::fromWindowFormat(const QWindowFormat &format)
 QWindowFormat QGLFormat::toWindowFormat(const QGLFormat &format)
 {
     QWindowFormat retFormat;
-    if (format.alphaBufferSize() >= 0)
-        retFormat.setAlphaBufferSize(format.alphaBufferSize());
+    if (format.alpha())
+        retFormat.setAlphaBufferSize(format.alphaBufferSize() == -1 ? 1 : format.alphaBufferSize());
     if (format.blueBufferSize() >= 0)
         retFormat.setBlueBufferSize(format.blueBufferSize());
     if (format.greenBufferSize() >= 0)
         retFormat.setGreenBufferSize(format.greenBufferSize());
     if (format.redBufferSize() >= 0)
         retFormat.setRedBufferSize(format.redBufferSize());
-    if (format.depthBufferSize() >= 0)
-        retFormat.setDepthBufferSize(format.depthBufferSize());
+    if (format.depth())
+        retFormat.setDepthBufferSize(format.depthBufferSize() == -1 ? 1 : format.depthBufferSize());
     retFormat.setSwapBehavior(format.doubleBuffer() ? QWindowFormat::DoubleBuffer : QWindowFormat::DefaultSwapBehavior);
-    if (format.sampleBuffers() && format.samples() > 1)
-        retFormat.setSamples(format.samples());
-    if (format.stencil() && format.stencilBufferSize() > 0)
-        retFormat.setStencilBufferSize(format.stencilBufferSize());
+    if (format.sampleBuffers())
+        retFormat.setSamples(format.samples() == -1 ? 4 : format.samples());
+    if (format.stencil())
+        retFormat.setStencilBufferSize(format.stencilBufferSize() == -1 ? 1 : format.stencilBufferSize());
     retFormat.setStereo(format.stereo());
     return retFormat;
 }
@@ -138,6 +138,8 @@ bool QGLContext::chooseContext(const QGLContext* shareContext)
                 winFormat.setSharedContext(shareContext->d_func()->windowContext);
             }
             widget->windowHandle()->setSurfaceType(QWindow::OpenGLSurface);
+            if (widget->testAttribute(Qt::WA_TranslucentBackground))
+                winFormat.setAlphaBufferSize(qMax(winFormat.alphaBufferSize(), 8));
             winFormat.setWindowSurface(false);
             widget->windowHandle()->setWindowFormat(winFormat);
             widget->winId();//make window
diff --git a/src/opengl/qglshaderprogram.cpp b/src/opengl/qglshaderprogram.cpp
index 4598bffabb..8ca95a88c9 100644
--- a/src/opengl/qglshaderprogram.cpp
+++ b/src/opengl/qglshaderprogram.cpp
@@ -362,17 +362,17 @@ QGLShader::ShaderType QGLShader::shaderType() const
 // The precision qualifiers are useful on OpenGL/ES systems,
 // but usually not present on desktop systems.  Define the
 // keywords to empty strings on desktop systems.
-#ifndef QT_OPENGL_ES
+#if !defined(QT_OPENGL_ES) || defined(QT_OPENGL_FORCE_SHADER_DEFINES)
 #define QGL_DEFINE_QUALIFIERS 1
 static const char qualifierDefines[] =
     "#define lowp\n"
     "#define mediump\n"
     "#define highp\n";
-#endif
+
+#else
 
 // The "highp" qualifier doesn't exist in fragment shaders
 // on all ES platforms.  When it doesn't exist, use "mediump".
-#ifdef QT_OPENGL_ES
 #define QGL_REDEFINE_HIGHP 1
 static const char redefineHighp[] =
     "#ifndef GL_FRAGMENT_PRECISION_HIGH\n"
diff --git a/src/opengl/qwindowsurface_gl.cpp b/src/opengl/qwindowsurface_gl.cpp
index 62a631855f..4f194327ad 100644
--- a/src/opengl/qwindowsurface_gl.cpp
+++ b/src/opengl/qwindowsurface_gl.cpp
@@ -485,19 +485,30 @@ void QGLWindowSurface::beginPaint(const QRegion &)
     d_ptr->did_paint = true;
     updateGeometry();
 
-    if (!context())
-        return;
-
     int clearFlags = 0;
 
-    if (context()->d_func()->workaround_needsFullClearOnEveryFrame)
+#if 0
+    QGLContext *ctx = reinterpret_cast<QGLContext *>(window()->d_func()->extraData()->glContext);
+#endif
+    const QGLContext *ctx = QGLContext::currentContext();
+
+    if (!ctx)
+        return;
+
+    if (ctx->d_func()->workaround_needsFullClearOnEveryFrame)
         clearFlags = GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT;
-    else if (context()->format().alpha())
+    else if (ctx->format().alpha())
         clearFlags = GL_COLOR_BUFFER_BIT;
 
     if (clearFlags) {
+        if (d_ptr->fbo)
+            d_ptr->fbo->bind();
+
         glClearColor(0.0, 0.0, 0.0, 0.0);
         glClear(clearFlags);
+
+        if (d_ptr->fbo)
+            d_ptr->fbo->release();
     }
 }
 
diff --git a/src/plugins/codecs/jp/qsjiscodec.cpp b/src/plugins/codecs/jp/qsjiscodec.cpp
index 49190d310f..3ea5300d51 100644
--- a/src/plugins/codecs/jp/qsjiscodec.cpp
+++ b/src/plugins/codecs/jp/qsjiscodec.cpp
@@ -155,7 +155,9 @@ QString QSjisCodec::convertToUnicode(const char* chars, int len, ConverterState
         uchar ch = chars[i];
         switch (nbuf) {
         case 0:
-            if (ch < 0x80 || IsKana(ch)) {
+            if (ch < 0x80) {
+                result += QValidChar(ch);
+            } else if (IsKana(ch)) {
                 // JIS X 0201 Latin or JIS X 0201 Kana
                 u = conv->jisx0201ToUnicode(ch);
                 result += QValidChar(u);
diff --git a/src/plugins/platforms/glxconvenience/glxconvenience.pri b/src/plugins/platforms/glxconvenience/glxconvenience.pri
index d6c992229e..b4d43a30b5 100644
--- a/src/plugins/platforms/glxconvenience/glxconvenience.pri
+++ b/src/plugins/platforms/glxconvenience/glxconvenience.pri
@@ -5,3 +5,11 @@ HEADERS += \
 
 SOURCES += \
     $$PWD/qglxconvenience.cpp
+
+CONFIG += xrender
+
+xrender {
+	LIBS += -lXrender
+} else {
+	DEFINES += QT_NO_XRENDER
+}
diff --git a/src/plugins/platforms/glxconvenience/qglxconvenience.cpp b/src/plugins/platforms/glxconvenience/qglxconvenience.cpp
index abf7b83e04..1d9c5090dd 100644
--- a/src/plugins/platforms/glxconvenience/qglxconvenience.cpp
+++ b/src/plugins/platforms/glxconvenience/qglxconvenience.cpp
@@ -43,6 +43,10 @@
 
 #include <QtCore/QVector>
 
+#ifndef QT_NO_XRENDER
+#include <X11/extensions/Xrender.h>
+#endif
+
 enum {
     XFocusOut = FocusOut,
     XFocusIn = FocusIn,
@@ -76,19 +80,25 @@ QVector<int> qglx_buildSpec(const QWindowFormat &format, int drawableBit)
     spec[i++] = GLX_DRAWABLE_TYPE; spec[i++] = drawableBit;
 
     spec[i++] = GLX_RENDER_TYPE; spec[i++] = GLX_RGBA_BIT;
+
     spec[i++] = GLX_RED_SIZE; spec[i++] = (format.redBufferSize() == -1) ? 1 : format.redBufferSize();
     spec[i++] = GLX_GREEN_SIZE; spec[i++] =  (format.greenBufferSize() == -1) ? 1 : format.greenBufferSize();
     spec[i++] = GLX_BLUE_SIZE; spec[i++] = (format.blueBufferSize() == -1) ? 1 : format.blueBufferSize();
     if (format.hasAlpha()) {
-        spec[i++] = GLX_ALPHA_SIZE; spec[i++] = (format.alphaBufferSize() == -1) ? 1 : format.alphaBufferSize();
+        spec[i++] = GLX_ALPHA_SIZE; spec[i++] = format.alphaBufferSize();
     }
 
     spec[i++] = GLX_DOUBLEBUFFER; spec[i++] = format.swapBehavior() != QWindowFormat::SingleBuffer ? True : False;
+
     spec[i++] = GLX_STEREO; spec[i++] =  format.stereo() ? True : False;
 
-    spec[i++] = GLX_DEPTH_SIZE; spec[i++] = (format.depthBufferSize() == -1) ? 1 : format.depthBufferSize();
+    if (format.depthBufferSize() > 0) {
+        spec[i++] = GLX_DEPTH_SIZE; spec[i++] = format.depthBufferSize();
+    }
 
-    spec[i++] = GLX_STENCIL_SIZE; spec[i++] =  (format.stencilBufferSize() == -1) ? 1 : format.stencilBufferSize();
+    if (format.stencilBufferSize() > 0) {
+        spec[i++] = GLX_STENCIL_SIZE; spec[i++] =  (format.stencilBufferSize() == -1) ? 1 : format.stencilBufferSize();
+    }
 
     if (format.samples() > 1) {
         spec[i++] = GLX_SAMPLE_BUFFERS_ARB;
@@ -119,8 +129,17 @@ GLXFBConfig qglx_findConfig(Display *display, int screen , const QWindowFormat &
                 if (reducedFormat.hasAlpha()) {
                     int alphaSize;
                     glXGetFBConfigAttrib(display,configs[i],GLX_ALPHA_SIZE,&alphaSize);
-                    if (alphaSize > 0)
-                        break;
+                    if (alphaSize > 0) {
+                        XVisualInfo *visual = glXGetVisualFromFBConfig(display, chosenConfig);
+#if !defined(QT_NO_XRENDER)
+                        XRenderPictFormat *pictFormat = XRenderFindVisualFormat(display, visual->visual);
+                        if (pictFormat->direct.alphaMask > 0)
+                            break;
+#else
+                        if (visual->depth == 32)
+                            break;
+#endif
+                    }
                 } else {
                     break; // Just choose the first in the list if there's no alpha requested
                 }
diff --git a/src/plugins/platforms/minimal/qminimalintegration.cpp b/src/plugins/platforms/minimal/qminimalintegration.cpp
index 1fb4f01c1e..13dba86691 100644
--- a/src/plugins/platforms/minimal/qminimalintegration.cpp
+++ b/src/plugins/platforms/minimal/qminimalintegration.cpp
@@ -50,8 +50,8 @@ QMinimalIntegration::QMinimalIntegration()
     QMinimalScreen *mPrimaryScreen = new QMinimalScreen();
 
     mPrimaryScreen->mGeometry = QRect(0, 0, 240, 320);
-    mPrimaryScreen->mDepth = 16;
-    mPrimaryScreen->mFormat = QImage::Format_RGB16;
+    mPrimaryScreen->mDepth = 32;
+    mPrimaryScreen->mFormat = QImage::Format_ARGB32_Premultiplied;
 
     mScreens.append(mPrimaryScreen);
 }
diff --git a/src/plugins/platforms/minimal/qminimalintegration.h b/src/plugins/platforms/minimal/qminimalintegration.h
index 7191441b91..eecb4e51a7 100644
--- a/src/plugins/platforms/minimal/qminimalintegration.h
+++ b/src/plugins/platforms/minimal/qminimalintegration.h
@@ -51,7 +51,7 @@ class QMinimalScreen : public QPlatformScreen
 {
 public:
     QMinimalScreen()
-        : mDepth(16), mFormat(QImage::Format_RGB16) {}
+        : mDepth(32), mFormat(QImage::Format_ARGB32_Premultiplied) {}
 
     QRect geometry() const { return mGeometry; }
     int depth() const { return mDepth; }
diff --git a/src/plugins/platforms/platforms.pro b/src/plugins/platforms/platforms.pro
index f27ec830e3..9d7ae296a9 100644
--- a/src/plugins/platforms/platforms.pro
+++ b/src/plugins/platforms/platforms.pro
@@ -6,7 +6,10 @@ contains(QT_CONFIG, wayland) {
     SUBDIRS += wayland
 }
 
+contains(QT_CONFIG, xcb) {
+    SUBDIRS += xcb
+}
+
 mac {
     SUBDIRS += cocoa
 }
-
diff --git a/src/plugins/platforms/wayland/gl_integration/xcomposite_glx/qwaylandxcompositeglxcontext.cpp b/src/plugins/platforms/wayland/gl_integration/xcomposite_glx/qwaylandxcompositeglxcontext.cpp
index 39316adf6c..39bd99e5a0 100644
--- a/src/plugins/platforms/wayland/gl_integration/xcomposite_glx/qwaylandxcompositeglxcontext.cpp
+++ b/src/plugins/platforms/wayland/gl_integration/xcomposite_glx/qwaylandxcompositeglxcontext.cpp
@@ -132,10 +132,12 @@ void QWaylandXCompositeGLXContext::geometryChanged()
     Colormap cmap = XCreateColormap(mGlxIntegration->xDisplay(),mGlxIntegration->rootWindow(),visualInfo->visual,AllocNone);
 
     XSetWindowAttributes a;
+    a.background_pixel = WhitePixel(mGlxIntegration->xDisplay(), mGlxIntegration->screen());
+    a.border_pixel = BlackPixel(mGlxIntegration->xDisplay(), mGlxIntegration->screen());
     a.colormap = cmap;
     mXWindow = XCreateWindow(mGlxIntegration->xDisplay(), mGlxIntegration->rootWindow(),0, 0, size.width(), size.height(),
                              0, visualInfo->depth, InputOutput, visualInfo->visual,
-                             CWColormap, &a);
+                             CWBackPixel|CWBorderPixel|CWColormap, &a);
 
     XCompositeRedirectWindow(mGlxIntegration->xDisplay(), mXWindow, CompositeRedirectManual);
     XMapWindow(mGlxIntegration->xDisplay(), mXWindow);
diff --git a/src/plugins/platforms/wayland/qwaylandclipboard.cpp b/src/plugins/platforms/wayland/qwaylandclipboard.cpp
index 77c9990d9e..3c90112a91 100644
--- a/src/plugins/platforms/wayland/qwaylandclipboard.cpp
+++ b/src/plugins/platforms/wayland/qwaylandclipboard.cpp
@@ -48,7 +48,7 @@
 #include <QtCore/QStringList>
 #include <QtCore/QFile>
 #include <QtCore/QtDebug>
-#include <QtWidgets/private/qdnd_p.h>
+#include <QtGui/private/qdnd_p.h>
 
 static QWaylandClipboard *clipboard;
 
diff --git a/src/plugins/platforms/wayland/qwaylanddisplay.cpp b/src/plugins/platforms/wayland/qwaylanddisplay.cpp
index bd3f210533..310e266e64 100644
--- a/src/plugins/platforms/wayland/qwaylanddisplay.cpp
+++ b/src/plugins/platforms/wayland/qwaylanddisplay.cpp
@@ -51,6 +51,10 @@
 #include "gl_integration/qwaylandglintegration.h"
 #endif
 
+#ifdef QT_WAYLAND_WINDOWMANAGER_SUPPORT
+#include "windowmanager_integration/qwaylandwindowmanagerintegration.h"
+#endif
+
 #include <QtCore/QAbstractEventDispatcher>
 #include <QtGui/private/qguiapplication_p.h>
 
@@ -96,6 +100,13 @@ QWaylandGLIntegration * QWaylandDisplay::eglIntegration()
 }
 #endif
 
+#ifdef QT_WAYLAND_WINDOWMANAGER_SUPPORT
+QWaylandWindowManagerIntegration *QWaylandDisplay::windowManagerIntegration()
+{
+    return mWindowManagerIntegration;
+}
+#endif
+
 void QWaylandDisplay::shellHandleConfigure(void *data, struct wl_shell *shell,
                                            uint32_t time, uint32_t edges,
                                            struct wl_surface *surface,
@@ -135,6 +146,10 @@ QWaylandDisplay::QWaylandDisplay(void)
     mEglIntegration->initialize();
 #endif
 
+#ifdef QT_WAYLAND_WINDOWMANAGER_SUPPORT
+    mWindowManagerIntegration = QWaylandWindowManagerIntegration::createIntegration(this);
+#endif
+
     connect(QAbstractEventDispatcher::instance(), SIGNAL(aboutToBlock()), this, SLOT(flushRequests()));
 
     mFd = wl_display_get_fd(mDisplay, sourceUpdate, this);
diff --git a/src/plugins/platforms/wayland/qwaylanddisplay.h b/src/plugins/platforms/wayland/qwaylanddisplay.h
index 0658956dc3..626636038d 100644
--- a/src/plugins/platforms/wayland/qwaylanddisplay.h
+++ b/src/plugins/platforms/wayland/qwaylanddisplay.h
@@ -55,6 +55,8 @@ class QWaylandBuffer;
 class QPlatformScreen;
 class QWaylandScreen;
 class QWaylandGLIntegration;
+class QWaylandWindowManagerIntegration;
+
 class QWaylandDisplay : public QObject {
     Q_OBJECT
 
@@ -74,6 +76,11 @@ public:
 #ifdef QT_WAYLAND_GL_SUPPORT
     QWaylandGLIntegration *eglIntegration();
 #endif
+
+#ifdef QT_WAYLAND_WINDOWMANAGER_SUPPORT
+    QWaylandWindowManagerIntegration *windowManagerIntegration();
+#endif
+
     void setCursor(QWaylandBuffer *buffer, int32_t x, int32_t y);
 
     void syncCallback(wl_display_sync_func_t func, void *data);
@@ -124,6 +131,10 @@ private:
     QWaylandGLIntegration *mEglIntegration;
 #endif
 
+#ifdef QT_WAYLAND_WINDOWMANAGER_SUPPORT
+    QWaylandWindowManagerIntegration *mWindowManagerIntegration;
+#endif
+
     static void shellHandleConfigure(void *data, struct wl_shell *shell,
                                      uint32_t time, uint32_t edges,
                                      struct wl_surface *surface,
diff --git a/src/plugins/platforms/wayland/qwaylandwindow.cpp b/src/plugins/platforms/wayland/qwaylandwindow.cpp
index b30cd4ab16..1e13f30b64 100644
--- a/src/plugins/platforms/wayland/qwaylandwindow.cpp
+++ b/src/plugins/platforms/wayland/qwaylandwindow.cpp
@@ -47,6 +47,12 @@
 #include "qwaylandscreen.h"
 
 #include <QtGui/QWindow>
+
+#ifdef QT_WAYLAND_WINDOWMANAGER_SUPPORT
+#include "windowmanager_integration/qwaylandwindowmanagerintegration.h"
+#endif
+
+#include <QCoreApplication>
 #include <QtGui/QWindowSystemInterface>
 
 #include <QDebug>
@@ -60,6 +66,10 @@ QWaylandWindow::QWaylandWindow(QWindow *window)
     static WId id = 1;
     mWindowId = id++;
 
+#ifdef QT_WAYLAND_WINDOWMANAGER_SUPPORT
+        mDisplay->windowManagerIntegration()->mapClientToProcess(qApp->applicationPid());
+#endif
+
     mSurface = mDisplay->createSurface(this);
 }
 
@@ -120,7 +130,6 @@ void QWaylandWindow::attach(QWaylandBuffer *buffer)
     }
 }
 
-
 void QWaylandWindow::damage(const QRegion &region)
 {
     //We have to do sync stuff before calling damage, or we might
diff --git a/src/plugins/platforms/wayland/wayland.pro b/src/plugins/platforms/wayland/wayland.pro
index 1a9368f13c..e49c73bfae 100644
--- a/src/plugins/platforms/wayland/wayland.pro
+++ b/src/plugins/platforms/wayland/wayland.pro
@@ -45,8 +45,10 @@ QT += core-private
 QT += widgets-private
 
 include ($$PWD/gl_integration/gl_integration.pri)
+include ($$PWD/windowmanager_integration/windowmanager_integration.pri)
 
 include (../fontdatabases/genericunix/genericunix.pri)
 
 target.path += $$[QT_INSTALL_PLUGINS]/platforms
 INSTALLS += target
+
diff --git a/src/plugins/platforms/wayland/windowmanager_integration/qwaylandwindowmanager-client-protocol.h b/src/plugins/platforms/wayland/windowmanager_integration/qwaylandwindowmanager-client-protocol.h
new file mode 100644
index 0000000000..ec776c5f87
--- /dev/null
+++ b/src/plugins/platforms/wayland/windowmanager_integration/qwaylandwindowmanager-client-protocol.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright © 2010 Kristian Høgsberg
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+
+#ifndef WAYLAND_WINDOWMANAGER_CLIENT_PROTOCOL_H
+#define WAYLAND_WINDOWMANAGER_CLIENT_PROTOCOL_H
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stddef.h>
+#include "wayland-util.h"
+
+struct wl_client;
+
+struct wl_windowmanager;
+
+extern const struct wl_interface wl_windowmanager_interface;
+
+#define WL_WINDOWMANAGER_MAP_CLIENT_TO_PROCESS	0
+
+static inline struct wl_windowmanager *
+wl_windowmanager_create(struct wl_display *display, uint32_t id, uint32_t /*version*/)
+{
+        // ### does not run without latest wayland. must be enabled later
+        //wl_display_bind(display, id, "wl_windowmanager", version);
+
+        return (struct wl_windowmanager *)
+                wl_proxy_create_for_id(display, &wl_windowmanager_interface, id);
+}
+
+static inline void
+wl_windowmanager_set_user_data(struct wl_windowmanager *wl_windowmanager, void *user_data)
+{
+        wl_proxy_set_user_data((struct wl_proxy *) wl_windowmanager, user_data);
+}
+
+static inline void *
+wl_windowmanager_get_user_data(struct wl_windowmanager *wl_windowmanager)
+{
+        return wl_proxy_get_user_data((struct wl_proxy *) wl_windowmanager);
+}
+
+static inline void
+wl_windowmanager_destroy(struct wl_windowmanager *wl_windowmanager)
+{
+        wl_proxy_destroy((struct wl_proxy *) wl_windowmanager);
+}
+
+static inline void
+wl_windowmanager_map_client_to_process(struct wl_windowmanager *wl_windowmanager, uint32_t processid)
+{
+        wl_proxy_marshal((struct wl_proxy *) wl_windowmanager,
+                         WL_WINDOWMANAGER_MAP_CLIENT_TO_PROCESS, processid);
+}
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/plugins/platforms/wayland/windowmanager_integration/qwaylandwindowmanagerintegration.cpp b/src/plugins/platforms/wayland/windowmanager_integration/qwaylandwindowmanagerintegration.cpp
new file mode 100644
index 0000000000..b93e6d2f70
--- /dev/null
+++ b/src/plugins/platforms/wayland/windowmanager_integration/qwaylandwindowmanagerintegration.cpp
@@ -0,0 +1,85 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwaylandwindowmanagerintegration.h"
+#include "qwaylandwindowmanager-client-protocol.h"
+
+#include <stdint.h>
+
+QWaylandWindowManagerIntegration *QWaylandWindowManagerIntegration::createIntegration(QWaylandDisplay *waylandDisplay)
+{
+    return new QWaylandWindowManagerIntegration(waylandDisplay);
+}
+
+QWaylandWindowManagerIntegration::QWaylandWindowManagerIntegration(QWaylandDisplay *waylandDisplay)
+    : mWaylandDisplay(waylandDisplay)
+    , mWaylandWindowManager(0)
+{
+    wl_display_add_global_listener(mWaylandDisplay->wl_display(),
+                                   QWaylandWindowManagerIntegration::wlHandleListenerGlobal,
+                                   this);
+}
+
+QWaylandWindowManagerIntegration::~QWaylandWindowManagerIntegration()
+{
+
+}
+
+struct wl_windowmanager *QWaylandWindowManagerIntegration::windowManager() const
+{
+    return mWaylandWindowManager;
+}
+
+void QWaylandWindowManagerIntegration::wlHandleListenerGlobal(wl_display *display, uint32_t id, const char *interface,
+                                                              uint32_t version, void *data)
+{
+    if (strcmp(interface, "wl_windowmanager") == 0) {
+        QWaylandWindowManagerIntegration *integration = static_cast<QWaylandWindowManagerIntegration *>(data);
+        integration->mWaylandWindowManager = wl_windowmanager_create(display,id, version);
+    }
+}
+
+void QWaylandWindowManagerIntegration::mapClientToProcess(long long processId)
+{
+    if (mWaylandWindowManager)
+        wl_windowmanager_map_client_to_process(mWaylandWindowManager, (uint32_t) processId);
+}
+
diff --git a/src/plugins/platforms/wayland/windowmanager_integration/qwaylandwindowmanagerintegration.h b/src/plugins/platforms/wayland/windowmanager_integration/qwaylandwindowmanagerintegration.h
new file mode 100644
index 0000000000..01a7bdd960
--- /dev/null
+++ b/src/plugins/platforms/wayland/windowmanager_integration/qwaylandwindowmanagerintegration.h
@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWAYLANDWINDOWMANAGERINTEGRATION_H
+#define QWAYLANDWINDOWMANAGERINTEGRATION_H
+
+#include <QObject>
+#include "wayland-client.h"
+#include "qwaylanddisplay.h"
+
+class QWaylandWindowManagerIntegration
+{
+public:
+    explicit QWaylandWindowManagerIntegration(QWaylandDisplay *waylandDisplay);
+    virtual ~QWaylandWindowManagerIntegration();
+    static QWaylandWindowManagerIntegration *createIntegration(QWaylandDisplay *waylandDisplay);
+    struct wl_windowmanager *windowManager() const;
+
+    void mapSurfaceToProcess(struct wl_surface *surface, long long processId);
+    void mapClientToProcess(long long processId);
+
+private:
+    static void wlHandleListenerGlobal(wl_display *display, uint32_t id,
+                                       const char *interface, uint32_t version, void *data);
+
+private:
+    QWaylandDisplay *mWaylandDisplay;
+    struct wl_windowmanager *mWaylandWindowManager;
+};
+
+#endif // QWAYLANDWINDOWMANAGERINTEGRATION_H
diff --git a/src/plugins/platforms/wayland/windowmanager_integration/wayland-windowmanager-protocol.c b/src/plugins/platforms/wayland/windowmanager_integration/wayland-windowmanager-protocol.c
new file mode 100644
index 0000000000..48049d8571
--- /dev/null
+++ b/src/plugins/platforms/wayland/windowmanager_integration/wayland-windowmanager-protocol.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright © 2010 Kristian Høgsberg
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+
+#include <stdlib.h>
+#include <stdint.h>
+#include "wayland-util.h"
+
+static const struct wl_message wl_windowmanager_requests[] = {
+        { "map_client_to_process", "u", NULL },
+};
+
+WL_EXPORT const struct wl_interface wl_windowmanager_interface = {
+        "wl_windowmanager", 1,
+        ARRAY_LENGTH(wl_windowmanager_requests), wl_windowmanager_requests,
+        0, NULL,
+};
diff --git a/src/plugins/platforms/wayland/windowmanager_integration/windowmanager_integration.pri b/src/plugins/platforms/wayland/windowmanager_integration/windowmanager_integration.pri
new file mode 100644
index 0000000000..a28218272d
--- /dev/null
+++ b/src/plugins/platforms/wayland/windowmanager_integration/windowmanager_integration.pri
@@ -0,0 +1,16 @@
+DEFINES += QT_WAYLAND_WINDOWMANAGER_SUPPORT
+
+contains(DEFINES, QT_WAYLAND_WINDOWMANAGER_SUPPORT) {
+
+    HEADERS += \
+        $$PWD/qwaylandwindowmanager-client-protocol.h \
+        $$PWD/qwaylandwindowmanagerintegration.h
+
+    SOURCES += \
+        $$PWD/qwaylandwindowmanagerintegration.cpp \
+        $$PWD/wayland-windowmanager-protocol.c
+
+}
+
+
+
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 074fdafe87..2a7594ee9b 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -140,8 +140,9 @@ void QXcbWindow::create()
         xcb_parent_id = static_cast<QXcbWindow *>(parent())->xcb_window();
 
 #if defined(XCB_USE_GLX) || defined(XCB_USE_EGL)
-    if (window()->surfaceType() == QWindow::OpenGLSurface
+    if ((window()->surfaceType() == QWindow::OpenGLSurface
         && QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::OpenGL))
+        || window()->requestedWindowFormat().hasAlpha())
     {
 #if defined(XCB_USE_GLX)
         XVisualInfo *visualInfo = qglx_findVisualInfo(DISPLAY_FROM_XCB(m_screen),m_screen->screenNumber(), window()->requestedWindowFormat());
@@ -159,13 +160,17 @@ void QXcbWindow::create()
         visualInfo = XGetVisualInfo(DISPLAY_FROM_XCB(this), VisualIDMask, &visualInfoTemplate, &matchingCount);
 #endif //XCB_USE_GLX
         if (visualInfo) {
+            m_depth = visualInfo->depth;
+            m_format = (m_depth == 32) ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
             Colormap cmap = XCreateColormap(DISPLAY_FROM_XCB(this), xcb_parent_id, visualInfo->visual, AllocNone);
 
             XSetWindowAttributes a;
+            a.background_pixel = WhitePixel(DISPLAY_FROM_XCB(this), m_screen->screenNumber());
+            a.border_pixel = BlackPixel(DISPLAY_FROM_XCB(this), m_screen->screenNumber());
             a.colormap = cmap;
             m_window = XCreateWindow(DISPLAY_FROM_XCB(this), xcb_parent_id, rect.x(), rect.y(), rect.width(), rect.height(),
                                       0, visualInfo->depth, InputOutput, visualInfo->visual,
-                                      CWColormap, &a);
+                                      CWBackPixel|CWBorderPixel|CWColormap, &a);
 
             printf("created GL window: %x\n", m_window);
         } else {
@@ -175,6 +180,8 @@ void QXcbWindow::create()
 #endif //defined(XCB_USE_GLX) || defined(XCB_USE_EGL)
     {
         m_window = xcb_generate_id(xcb_connection());
+        m_depth = m_screen->screen()->root_depth;
+        m_format = (m_depth == 32) ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
 
         Q_XCB_CALL(xcb_create_window(xcb_connection(),
                                      XCB_COPY_FROM_PARENT,            // depth -- same as root
diff --git a/src/plugins/platforms/xcb/qxcbwindow.h b/src/plugins/platforms/xcb/qxcbwindow.h
index a6ca3de565..ec6fe95dd8 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.h
+++ b/src/plugins/platforms/xcb/qxcbwindow.h
@@ -44,6 +44,7 @@
 
 #include <QtGui/QPlatformWindow>
 #include <QtGui/QWindowFormat>
+#include <QtGui/QImage>
 
 #include <xcb/xcb.h>
 #include <xcb/sync.h>
@@ -76,6 +77,8 @@ public:
     QPlatformGLContext *glContext() const;
 
     xcb_window_t xcb_window() const { return m_window; }
+    uint depth() const { return m_depth; }
+    QImage::Format format() const { return m_format; }
 
     void handleExposeEvent(const xcb_expose_event_t *event);
     void handleClientMessageEvent(const xcb_client_message_event_t *event);
@@ -116,6 +119,9 @@ private:
     xcb_window_t m_window;
     QPlatformGLContext *m_context;
 
+    uint m_depth;
+    QImage::Format m_format;
+
     xcb_sync_int64_t m_syncValue;
     xcb_sync_counter_t m_syncCounter;
 
diff --git a/src/plugins/platforms/xcb/qxcbwindowsurface.cpp b/src/plugins/platforms/xcb/qxcbwindowsurface.cpp
index a371d2dd06..07b3763ff0 100644
--- a/src/plugins/platforms/xcb/qxcbwindowsurface.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindowsurface.cpp
@@ -54,11 +54,12 @@
 #include <stdio.h>
 
 #include <qdebug.h>
+#include <qpainter.h>
 
 class QXcbShmImage : public QXcbObject
 {
 public:
-    QXcbShmImage(QXcbScreen *connection, const QSize &size);
+    QXcbShmImage(QXcbScreen *connection, const QSize &size, uint depth, QImage::Format format);
     ~QXcbShmImage() { destroy(); }
 
     QImage *image() { return &m_qimage; }
@@ -81,7 +82,7 @@ private:
     QRegion m_dirty;
 };
 
-QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size)
+QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size, uint depth, QImage::Format format)
     : QXcbObject(screen->connection())
     , m_gc(0)
     , m_gc_window(0)
@@ -91,7 +92,7 @@ QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size)
                                           size.width(),
                                           size.height(),
                                           XCB_IMAGE_FORMAT_Z_PIXMAP,
-                                          screen->depth(),
+                                          depth,
                                           0,
                                           ~0,
                                           0);
@@ -111,7 +112,7 @@ QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size)
     if (shmctl(m_shm_info.shmid, IPC_RMID, 0) == -1)
         qWarning() << "QXcbWindowSurface: Error while marking the shared memory segment to be destroyed";
 
-    m_qimage = QImage( (uchar*) m_xcb_image->data, m_xcb_image->width, m_xcb_image->height, m_xcb_image->stride, screen->format());
+    m_qimage = QImage( (uchar*) m_xcb_image->data, m_xcb_image->width, m_xcb_image->height, m_xcb_image->stride, format);
 }
 
 void QXcbShmImage::destroy()
@@ -189,6 +190,16 @@ QPaintDevice *QXcbWindowSurface::paintDevice()
 void QXcbWindowSurface::beginPaint(const QRegion &region)
 {
     m_image->preparePaint(region);
+
+    if (m_image->image()->hasAlphaChannel()) {
+        QPainter p(m_image->image());
+        p.setCompositionMode(QPainter::CompositionMode_Source);
+        const QVector<QRect> rects = region.rects();
+        const QColor blank = Qt::transparent;
+        for (QVector<QRect>::const_iterator it = rects.begin(); it != rects.end(); ++it) {
+            p.fillRect(*it, blank);
+        }
+    }
 }
 
 void QXcbWindowSurface::endPaint(const QRegion &)
@@ -229,9 +240,10 @@ void QXcbWindowSurface::resize(const QSize &size)
     QWindowSurface::resize(size);
 
     QXcbScreen *screen = static_cast<QXcbScreen *>(QPlatformScreen::platformScreenForWindow(window()));
+    QXcbWindow* win = static_cast<QXcbWindow *>(window()->handle());
 
     delete m_image;
-    m_image = new QXcbShmImage(screen, size);
+    m_image = new QXcbShmImage(screen, size, win->depth(), win->format());
     Q_XCB_NOOP(connection());
 
     m_syncingResize = true;
diff --git a/src/plugins/platforms/xlib/qxlibintegration.cpp b/src/plugins/platforms/xlib/qxlibintegration.cpp
index 78f907abd2..b0c8bc9560 100644
--- a/src/plugins/platforms/xlib/qxlibintegration.cpp
+++ b/src/plugins/platforms/xlib/qxlibintegration.cpp
@@ -150,7 +150,7 @@ bool QXlibIntegration::hasOpenGL() const
 {
 #if !defined(QT_NO_OPENGL)
 #if !defined(QT_OPENGL_ES_2)
-    QXlibScreen *screen = static_cast<const QXlibScreen *>(mScreens.at(0));
+    QXlibScreen *screen = static_cast<QXlibScreen *>(mScreens.at(0));
     return glXQueryExtension(screen->display()->nativeDisplay(), 0, 0) != 0;
 #else
     static bool eglHasbeenInitialized = false;
diff --git a/src/plugins/platforms/xlib/qxlibscreen.cpp b/src/plugins/platforms/xlib/qxlibscreen.cpp
index 7c8a367373..920116a614 100644
--- a/src/plugins/platforms/xlib/qxlibscreen.cpp
+++ b/src/plugins/platforms/xlib/qxlibscreen.cpp
@@ -41,6 +41,8 @@
 
 #include "qxlibscreen.h"
 
+#include <X11/extensions/Xfixes.h>
+
 #include "qxlibcursor.h"
 #include "qxlibwindow.h"
 #include "qxlibkeyboard.h"
@@ -54,8 +56,6 @@
 
 #include <private/qapplication_p.h>
 
-#include <X11/extensions/Xfixes.h>
-
 QT_BEGIN_NAMESPACE
 
 static int (*original_x_errhandler)(Display *dpy, XErrorEvent *);
@@ -201,7 +201,7 @@ QXlibScreen::QXlibScreen()
 
 
 #ifndef DONT_USE_MIT_SHM
-    Status MIT_SHM_extension_supported = XShmQueryExtension (mDisplay->nativeDisplay());
+    int MIT_SHM_extension_supported = XShmQueryExtension (mDisplay->nativeDisplay());
     Q_ASSERT(MIT_SHM_extension_supported == True);
 #endif
     original_x_errhandler = XSetErrorHandler(qt_x_errhandler);
diff --git a/src/plugins/platforms/xlib/qxlibstatic.cpp b/src/plugins/platforms/xlib/qxlibstatic.cpp
index 61177812d5..7b562ea50d 100644
--- a/src/plugins/platforms/xlib/qxlibstatic.cpp
+++ b/src/plugins/platforms/xlib/qxlibstatic.cpp
@@ -51,10 +51,6 @@
 
 #include <QDebug>
 
-#ifndef QT_NO_XFIXES
-#include <X11/extensions/Xfixes.h>
-#endif // QT_NO_XFIXES
-
 static const char * x11_atomnames = {
     // window-manager <-> client protocols
     "WM_PROTOCOLS\0"
diff --git a/src/plugins/platforms/xlib/qxlibstatic.h b/src/plugins/platforms/xlib/qxlibstatic.h
index 8517de0bc2..fec2a16cdf 100644
--- a/src/plugins/platforms/xlib/qxlibstatic.h
+++ b/src/plugins/platforms/xlib/qxlibstatic.h
@@ -135,6 +135,7 @@ typedef char *XPointer;
 #endif
 
 #ifndef QT_NO_XFIXES
+#include <X11/extensions/Xfixes.h>
 typedef Bool (*PtrXFixesQueryExtension)(Display *, int *, int *);
 typedef Status (*PtrXFixesQueryVersion)(Display *, int *, int *);
 typedef void (*PtrXFixesSetCursorName)(Display *dpy, Cursor cursor, const char *name);
diff --git a/src/plugins/platforms/xlib/qxlibwindow.cpp b/src/plugins/platforms/xlib/qxlibwindow.cpp
index 9a05fc620d..50ea7b58e4 100644
--- a/src/plugins/platforms/xlib/qxlibwindow.cpp
+++ b/src/plugins/platforms/xlib/qxlibwindow.cpp
@@ -47,14 +47,6 @@
 #include "qxlibstatic.h"
 #include "qxlibdisplay.h"
 
-#include <QtGui/QWindowSystemInterface>
-#include <QSocketNotifier>
-#include <QApplication>
-#include <QDebug>
-
-#include <QtGui/private/qwindowsurface_p.h>
-#include <QtGui/private/qapplication_p.h>
-
 #if !defined(QT_NO_OPENGL)
 #if !defined(QT_OPENGL_ES_2)
 #include "qglxintegration.h"
@@ -66,6 +58,15 @@
 #endif  //QT_OPENGL_ES_2
 #endif //QT_NO_OPENGL
 
+
+#include <QtGui/QWindowSystemInterface>
+#include <QSocketNotifier>
+#include <QApplication>
+#include <QDebug>
+
+#include <QtGui/private/qwindowsurface_p.h>
+#include <QtGui/private/qapplication_p.h>
+
 //#define MYX11_DEBUG
 
 QT_BEGIN_NAMESPACE
@@ -80,9 +81,10 @@ QXlibWindow::QXlibWindow(QWidget *window)
     int w = window->width();
     int h = window->height();
 
-    if(window->platformWindowFormat().windowApi() == QPlatformWindowFormat::OpenGL
-            && QApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::OpenGL) ) {
 #if !defined(QT_NO_OPENGL)
+    if(window->platformWindowFormat().windowApi() == QPlatformWindowFormat::OpenGL
+            && QApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::OpenGL)
+            || window->platformWindowFormat().alpha()) {
 #if !defined(QT_OPENGL_ES_2)
         XVisualInfo *visualInfo = qglx_findVisualInfo(mScreen->display()->nativeDisplay(),mScreen->xScreenNumber(),window->platformWindowFormat());
 #else
@@ -101,18 +103,28 @@ QXlibWindow::QXlibWindow(QWidget *window)
         visualInfo = XGetVisualInfo(mScreen->display()->nativeDisplay(), VisualIDMask, &visualInfoTemplate, &matchingCount);
 #endif //!defined(QT_OPENGL_ES_2)
         if (visualInfo) {
-            Colormap cmap = XCreateColormap(mScreen->display()->nativeDisplay(),mScreen->rootWindow(),visualInfo->visual,AllocNone);
+            mDepth = visualInfo->depth;
+            mFormat = (mDepth == 32) ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
+            mVisual = visualInfo->visual;
+            Colormap cmap = XCreateColormap(mScreen->display()->nativeDisplay(), mScreen->rootWindow(), visualInfo->visual, AllocNone);
 
             XSetWindowAttributes a;
+            a.background_pixel = WhitePixel(mScreen->display()->nativeDisplay(), mScreen->xScreenNumber());
+            a.border_pixel = BlackPixel(mScreen->display()->nativeDisplay(), mScreen->xScreenNumber());
             a.colormap = cmap;
             x_window = XCreateWindow(mScreen->display()->nativeDisplay(), mScreen->rootWindow(),x, y, w, h,
                                      0, visualInfo->depth, InputOutput, visualInfo->visual,
-                                     CWColormap, &a);
+                                     CWBackPixel|CWBorderPixel|CWColormap, &a);
         } else {
             qFatal("no window!");
         }
+    } else
 #endif //!defined(QT_NO_OPENGL)
-    } else {
+    {
+        mDepth = mScreen->depth();
+        mFormat = (mDepth == 32) ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
+        mVisual = mScreen->defaultVisual();
+
         x_window = XCreateSimpleWindow(mScreen->display()->nativeDisplay(), mScreen->rootWindow(),
                                        x, y, w, h, 0 /*border_width*/,
                                        mScreen->blackPixel(), mScreen->whitePixel());
diff --git a/src/plugins/platforms/xlib/qxlibwindow.h b/src/plugins/platforms/xlib/qxlibwindow.h
index 08694a5026..2d11224c23 100644
--- a/src/plugins/platforms/xlib/qxlibwindow.h
+++ b/src/plugins/platforms/xlib/qxlibwindow.h
@@ -122,6 +122,10 @@ public:
     Window xWindow() const;
     GC graphicsContext() const;
 
+    inline uint depth() const { return mDepth; }
+    QImage::Format format() const { return mFormat; }
+    Visual* visual() const { return mVisual; }
+
 protected:
     QVector<Atom> getNetWmState() const;
     void setMWMHints(const QXlibMWMHints &mwmhints);
@@ -135,6 +139,10 @@ private:
     Window x_window;
     GC gc;
 
+    uint mDepth;
+    QImage::Format mFormat;
+    Visual* mVisual;
+
     GC createGC();
 
     QPlatformGLContext *mGLContext;
diff --git a/src/plugins/platforms/xlib/qxlibwindowsurface.cpp b/src/plugins/platforms/xlib/qxlibwindowsurface.cpp
index 513f10dc6a..a917f452e8 100644
--- a/src/plugins/platforms/xlib/qxlibwindowsurface.cpp
+++ b/src/plugins/platforms/xlib/qxlibwindowsurface.cpp
@@ -49,6 +49,8 @@
 #include "qxlibscreen.h"
 #include "qxlibdisplay.h"
 
+#include "qpainter.h"
+
 # include <sys/ipc.h>
 # include <sys/shm.h>
 # include <X11/extensions/XShm.h>
@@ -80,20 +82,19 @@ void QXlibShmImageInfo::destroy()
 
 void QXlibWindowSurface::resizeShmImage(int width, int height)
 {
+    QXlibScreen *screen = QXlibScreen::testLiteScreenForWidget(window());
+    QXlibWindow *win = static_cast<QXlibWindow*>(window()->platformWindow());
 
 #ifdef DONT_USE_MIT_SHM
-    shm_img = QImage(width, height, QImage::Format_RGB32);
+    shm_img = QImage(width, height, win->format());
 #else
 
-    QXlibScreen *screen = QXlibScreen::testLiteScreenForWidget(window());
     if (image_info)
         image_info->destroy();
     else
         image_info = new QXlibShmImageInfo(screen->display()->nativeDisplay());
 
-    Visual *visual = screen->defaultVisual();
-
-    XImage *image = XShmCreateImage (screen->display()->nativeDisplay(), visual, 24, ZPixmap, 0,
+    XImage *image = XShmCreateImage (screen->display()->nativeDisplay(), win->visual(), win->depth(), ZPixmap, 0,
                                      &image_info->shminfo, width, height);
 
 
@@ -109,7 +110,7 @@ void QXlibWindowSurface::resizeShmImage(int width, int height)
 
     Q_ASSERT(shm_attach_status == True);
 
-    shm_img = QImage( (uchar*) image->data, image->width, image->height, image->bytes_per_line, QImage::Format_RGB32 );
+    shm_img = QImage( (uchar*) image->data, image->width, image->height, image->bytes_per_line, win->format() );
 #endif
     painted = false;
 }
@@ -160,11 +161,11 @@ void QXlibWindowSurface::flush(QWidget *widget, const QRegion &region, const QPo
 #ifdef DONT_USE_MIT_SHM
     // just convert the image every time...
     if (!shm_img.isNull()) {
-        Visual *visual = DefaultVisual(screen->display(), screen->xScreenNumber());
+        QXlibWindow *win = static_cast<QXlibWindow*>(window()->platformWindow());
 
         QImage image = shm_img;
         //img.convertToFormat(
-        XImage *xi = XCreateImage(screen->display(), visual, 24, ZPixmap,
+        XImage *xi = XCreateImage(screen->display(), win->visual(), win->depth(), ZPixmap,
                                   0, (char *) image.scanLine(0), image.width(), image.height(),
                                   32, image.bytesPerLine());
 
@@ -214,6 +215,16 @@ void QXlibWindowSurface::beginPaint(const QRegion &region)
 {
     Q_UNUSED(region);
     resizeBuffer(size());
+
+    if (shm_img.hasAlphaChannel()) {
+        QPainter p(&shm_img);
+        p.setCompositionMode(QPainter::CompositionMode_Source);
+        const QVector<QRect> rects = region.rects();
+        const QColor blank = Qt::transparent;
+        for (QVector<QRect>::const_iterator it = rects.begin(); it != rects.end(); ++it) {
+            p.fillRect(*it, blank);
+        }
+    }
 }
 
 void QXlibWindowSurface::endPaint(const QRegion &region)
diff --git a/src/qbase.pri b/src/qbase.pri
index 03f85cf931..cf02978853 100644
--- a/src/qbase.pri
+++ b/src/qbase.pri
@@ -174,7 +174,7 @@ contains(QT_PRODUCT, OpenSource.*):DEFINES *= QT_OPENSOURCE
 DEFINES *= QT_NO_CAST_TO_ASCII QT_ASCII_CAST_WARNINGS
 contains(QT_CONFIG, gui-qt3support):DEFINES *= QT3_SUPPORT
 DEFINES *= QT_MOC_COMPAT #we don't need warnings from calling moc code in our generated code
-DEFINES *= QT_USE_FAST_OPERATOR_PLUS QT_USE_FAST_CONCATENATION
+DEFINES *= QT_USE_QSTRINGBUILDER
 
 TARGET = $$qtLibraryTarget($$TARGET$$QT_LIBINFIX) #do this towards the end
 
diff --git a/src/uitools/quiloader.cpp b/src/uitools/quiloader.cpp
index 6270e35d54..7950901055 100644
--- a/src/uitools/quiloader.cpp
+++ b/src/uitools/quiloader.cpp
@@ -653,7 +653,7 @@ QUiLoader::~QUiLoader()
     Loads a form from the given \a device and creates a new widget with the
     given \a parentWidget to hold its contents.
 
-    \sa createWidget()
+    \sa createWidget(), errorString()
 */
 QWidget *QUiLoader::load(QIODevice *device, QWidget *parentWidget)
 {
@@ -936,6 +936,19 @@ bool QUiLoader::isTranslationEnabled() const
     return d->builder.trEnabled;
 }
 
+/*!
+    Returns a human-readable description of the last error occurred in load().
+
+    \since 5.0
+    \sa load()
+*/
+
+QString QUiLoader::errorString() const
+{
+    Q_D(const QUiLoader);
+    return d->builder.errorString();
+}
+
 QT_END_NAMESPACE
 
 #include "quiloader.moc"
diff --git a/src/uitools/quiloader.h b/src/uitools/quiloader.h
index 214342ef83..0c21a276ee 100644
--- a/src/uitools/quiloader.h
+++ b/src/uitools/quiloader.h
@@ -90,6 +90,8 @@ public:
     void setTranslationEnabled(bool enabled);
     bool isTranslationEnabled() const;
 
+    QString errorString() const;
+
 private:
     QScopedPointer<QUiLoaderPrivate> d_ptr;
     Q_DECLARE_PRIVATE(QUiLoader)
diff --git a/src/widgets/kernel/qwidget_qpa.cpp b/src/widgets/kernel/qwidget_qpa.cpp
index 6721fdbb6a..02487679bf 100644
--- a/src/widgets/kernel/qwidget_qpa.cpp
+++ b/src/widgets/kernel/qwidget_qpa.cpp
@@ -96,6 +96,12 @@ void QWidgetPrivate::create_sys(WId window, bool initializeWindow, bool destroyO
     win->setWindowFlags(data.window_flags);
     win->setGeometry(q->geometry());
 
+    if (q->testAttribute(Qt::WA_TranslucentBackground)) {
+        QWindowFormat format = win->requestedWindowFormat();
+        format.setAlphaBufferSize(8);
+        win->setWindowFormat(format);
+    }
+
     if (QWidget *nativeParent = q->nativeParentWidget()) {
         if (nativeParent->windowHandle())
             win->setParent(nativeParent->windowHandle());
@@ -396,6 +402,7 @@ void QWidgetPrivate::show_sys()
                 surface->resize(geomRect.size());
             }
         }
+
         if (window)
             window->setVisible(true);
     }
diff --git a/src/widgets/platforms/x11/qapplication_x11.cpp b/src/widgets/platforms/x11/qapplication_x11.cpp
index 20542ea328..d1f9eb1b8a 100644
--- a/src/widgets/platforms/x11/qapplication_x11.cpp
+++ b/src/widgets/platforms/x11/qapplication_x11.cpp
@@ -1740,8 +1740,8 @@ void qt_init(QApplicationPrivate *priv, int,
     } else {
         // Qt controls everything (default)
 
-        if (QApplication::testAttribute(Qt::AA_X11InitThreads))
-            XInitThreads();
+        // With the threaded QML renderer, we always need this.
+        XInitThreads();
 
         // Set application name and class
         char *app_class = 0;