7 files changed, 46 insertions, 14 deletions
diff --git a/src/quick/items/qquickitem.cpp b/src/quick/items/qquickitem.cpp
index 58e1612e19..110e14d266 100644
--- a/src/quick/items/qquickitem.cpp
+++ b/src/quick/items/qquickitem.cpp
@@ -1363,7 +1363,7 @@ QQuickKeysAttached *QQuickKeysAttached::qmlAttachedProperties(QObject *obj)
     \brief Property used to mirror layout behavior
 
     The LayoutMirroring attached property is used to horizontally mirror \l {anchor-layout}{Item anchors},
-    \l{Item Layouts}{positioner} types (such as \l Row and \l Grid)
+    \l{Item Positioners}{positioner} types (such as \l Row and \l Grid)
     and views (such as \l GridView and horizontal \l ListView). Mirroring is a visual change: left
     anchors become right anchors, and positioner types like \l Grid and \l Row reverse the
     horizontal layout of child items.
@@ -1403,7 +1403,7 @@ QQuickKeysAttached *QQuickKeysAttached::qmlAttachedProperties(QObject *obj)
 
     This property holds whether the item's layout is mirrored horizontally. Setting this to true
     horizontally reverses \l {anchor-layout}{anchor} settings such that left anchors become right,
-    and right anchors become left. For \l{Item Layouts}{positioner} types
+    and right anchors become left. For \l{Item Positioners}{positioner} types
     (such as \l Row and \l Grid) and view types (such as \l {GridView}{GridView} and \l {ListView}{ListView})
     this also mirrors the horizontal layout direction of the item.
 
diff --git a/src/quick/items/qquickpositioners.cpp b/src/quick/items/qquickpositioners.cpp
index 789d2e62aa..b07a38cdaf 100644
--- a/src/quick/items/qquickpositioners.cpp
+++ b/src/quick/items/qquickpositioners.cpp
@@ -626,7 +626,7 @@ void QQuickPositionerAttached::setIsLastItem(bool isLastItem)
     more information about its position within the Column.
 
     For more information on using Column and other related positioner-types, see
-    \l{Item Layouts}.
+    \l{Item Positioners}.
 
 
     \section1 Using Transitions
@@ -644,7 +644,7 @@ void QQuickPositionerAttached::setIsLastItem(bool isLastItem)
 
     \image verticalpositioner_transition.gif
 
-    \sa Row, Grid, Flow, Positioner, {Qt Quick Examples - Positioners}
+    \sa Row, Grid, Flow, Positioner, ColumnLayout, {Qt Quick Examples - Positioners}
 */
 /*!
     \qmlproperty Transition QtQuick2::Column::populate
@@ -795,10 +795,10 @@ void QQuickColumn::reportConflictingAnchors()
     more information about its position within the Row.
 
     For more information on using Row and other related positioner-types, see
-    \l{Item Layouts}.
+    \l{Item Positioners}.
 
 
-    \sa Column, Grid, Flow, Positioner, {Qt Quick Examples - Positioners}
+    \sa Column, Grid, Flow, Positioner, RowLayout, {Qt Quick Examples - Positioners}
 */
 /*!
     \qmlproperty Transition QtQuick2::Row::populate
@@ -1028,10 +1028,10 @@ void QQuickRow::reportConflictingAnchors()
     or anchor itself with any of the \l {Item::anchors}{anchor} properties.
 
     For more information on using Grid and other related positioner-types, see
-    \l{Item Layouts}.
+    \l{Item Positioners}.
 
 
-    \sa Flow, Row, Column, Positioner, {Qt Quick Examples - Positioners}
+    \sa Flow, Row, Column, Positioner, GridLayout, {Qt Quick Examples - Positioners}
 */
 /*!
     \qmlproperty Transition QtQuick2::Grid::populate
@@ -1570,7 +1570,7 @@ void QQuickGrid::reportConflictingAnchors()
     or anchor itself with any of the \l {Item::anchors}{anchor} properties.
 
     For more information on using Flow and other related positioner-types, see
-    \l{Item Layouts}.
+    \l{Item Positioners}.
 
   \sa Column, Row, Grid, Positioner, {Qt Quick Examples - Positioners}
 */
diff --git a/src/quick/items/qquickshadereffect.cpp b/src/quick/items/qquickshadereffect.cpp
index 102066704b..f39a15070c 100644
--- a/src/quick/items/qquickshadereffect.cpp
+++ b/src/quick/items/qquickshadereffect.cpp
@@ -912,8 +912,8 @@ QSGNode *QQuickShaderEffect::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeDa
 {
     QQuickShaderEffectNode *node = static_cast<QQuickShaderEffectNode *>(oldNode);
 
-    // In the case of a bad vertex shader, don't try to create a node...
-    if (m_common.attributes.isEmpty()) {
+    // In the case of zero-size or a bad vertex shader, don't try to create a node...
+    if (m_common.attributes.isEmpty() || width() <= 0 || height() <= 0) {
         if (node)
             delete node;
         return 0;
diff --git a/src/quick/items/qquickshadereffectsource.cpp b/src/quick/items/qquickshadereffectsource.cpp
index bd0bb2348e..9debfe35b3 100644
--- a/src/quick/items/qquickshadereffectsource.cpp
+++ b/src/quick/items/qquickshadereffectsource.cpp
@@ -942,7 +942,7 @@ void QQuickShaderEffectSource::releaseResources()
 
 QSGNode *QQuickShaderEffectSource::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
 {
-    if (!m_sourceItem || m_sourceItem->width() == 0 || m_sourceItem->height() == 0) {
+    if (!m_sourceItem || m_sourceItem->width() <= 0 || m_sourceItem->height() <= 0) {
         if (m_texture)
             m_texture->setItem(0);
         delete oldNode;
diff --git a/src/quick/items/qquickwindow.cpp b/src/quick/items/qquickwindow.cpp
index 4a34adabe8..7137bb165e 100644
--- a/src/quick/items/qquickwindow.cpp
+++ b/src/quick/items/qquickwindow.cpp
@@ -74,6 +74,8 @@ QT_BEGIN_NAMESPACE
 
 extern Q_GUI_EXPORT QImage qt_gl_read_framebuffer(const QSize &size, bool alpha_format, bool include_alpha);
 
+bool QQuickWindowPrivate::defaultAlphaBuffer(0);
+
 void QQuickWindowPrivate::updateFocusItemTransform()
 {
     Q_Q(QQuickWindow);
@@ -2969,7 +2971,7 @@ QSGTexture *QQuickWindow::createTextureFromId(uint id, const QSize &size, Create
     Setting the clear color has no effect when clearing is disabled.
     By default, the clear color is white.
 
-    \sa setClearBeforeRendering()
+    \sa setClearBeforeRendering(), setDefaultAlphaBuffer()
  */
 
 void QQuickWindow::setColor(const QColor &color)
@@ -2979,7 +2981,7 @@ void QQuickWindow::setColor(const QColor &color)
         return;
 
     if (color.alpha() != d->clearColor.alpha()) {
-        QSurfaceFormat fmt = format();
+        QSurfaceFormat fmt = requestedFormat();
         if (color.alpha() < 255)
             fmt.setAlphaBufferSize(8);
         else
@@ -2997,6 +2999,31 @@ QColor QQuickWindow::color() const
 }
 
 /*!
+    \brief Returns whether to use alpha transparency on newly created windows.
+
+    \since Qt 5.1
+    \sa setDefaultAlphaBuffer()
+ */
+bool QQuickWindow::hasDefaultAlphaBuffer()
+{
+    return QQuickWindowPrivate::defaultAlphaBuffer;
+}
+
+/*!
+    \brief \a useAlpha specifies whether to use alpha transparency on newly created windows.
+    \since Qt 5.1
+
+    In any application which expects to create translucent windows, it's
+    necessary to set this to true before creating the first QQuickWindow,
+    because all windows will share the same \l QOpenGLContext. The default
+    value is false.
+ */
+void QQuickWindow::setDefaultAlphaBuffer(bool useAlpha)
+{
+    QQuickWindowPrivate::defaultAlphaBuffer = useAlpha;
+}
+
+/*!
     \qmlproperty string QtQuick.Window2::Window::title
 
     The window's title in the windowing system.
diff --git a/src/quick/items/qquickwindow.h b/src/quick/items/qquickwindow.h
index fc148aabe6..a0bc832334 100644
--- a/src/quick/items/qquickwindow.h
+++ b/src/quick/items/qquickwindow.h
@@ -115,6 +115,9 @@ public:
     void setColor(const QColor &color);
     QColor color() const;
 
+    static bool hasDefaultAlphaBuffer();
+    static void setDefaultAlphaBuffer(bool useAlpha);
+
     void setPersistentOpenGLContext(bool persistent);
     bool isPersistentOpenGLContext() const;
 
diff --git a/src/quick/items/qquickwindow_p.h b/src/quick/items/qquickwindow_p.h
index 9e3251b240..2465629778 100644
--- a/src/quick/items/qquickwindow_p.h
+++ b/src/quick/items/qquickwindow_p.h
@@ -219,6 +219,8 @@ public:
 
     mutable QQuickWindowIncubationController *incubationController;
 
+    static bool defaultAlphaBuffer;
+
     static bool dragOverThreshold(qreal d, Qt::Axis axis, QMouseEvent *event);
 
     // data property