Initial import from the monolithic Qt.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 1008 insertions, 0 deletions

diff --git a/src/gui/kernel/qplatformwindowformat_qpa.cpp b/src/gui/kernel/qplatformwindowformat_qpa.cpp
new file mode 100644
index 0000000000..c165c8513a
--- /dev/null
+++ b/src/gui/kernel/qplatformwindowformat_qpa.cpp
@@ -0,0 +1,1008 @@
+/****************************************************************************
+**
+** 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 QtGui module 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 "qplatformwindowformat_qpa.h"
+
+#include <QtCore/QDebug>
+
+Q_GLOBAL_STATIC(QPlatformWindowFormat, q_platformwindow_default_format);
+
+class QPlatformWindowFormatPrivate
+{
+public:
+    QPlatformWindowFormatPrivate()
+        : ref(1)
+        , opts(QPlatformWindowFormat::DoubleBuffer | QPlatformWindowFormat::DepthBuffer
+             | QPlatformWindowFormat::Rgba | QPlatformWindowFormat::DirectRendering
+             | QPlatformWindowFormat::StencilBuffer | QPlatformWindowFormat::DeprecatedFunctions
+             | QPlatformWindowFormat::HasWindowSurface)
+        , depthSize(-1)
+        , accumSize(-1)
+        , stencilSize(-1)
+        , redSize(-1)
+        , greenSize(-1)
+        , blueSize(-1)
+        , alphaSize(-1)
+        , numSamples(-1)
+        , swapInterval(-1)
+        , windowApi(QPlatformWindowFormat::Raster)
+        , sharedContext(0)
+    {
+    }
+
+    QPlatformWindowFormatPrivate(const QPlatformWindowFormatPrivate *other)
+        : ref(1),
+          opts(other->opts),
+          depthSize(other->depthSize),
+          accumSize(other->accumSize),
+          stencilSize(other->stencilSize),
+          redSize(other->redSize),
+          greenSize(other->greenSize),
+          blueSize(other->blueSize),
+          alphaSize(other->alphaSize),
+          numSamples(other->numSamples),
+          swapInterval(other->swapInterval),
+          windowApi(other->windowApi),
+          sharedContext(other->sharedContext)
+    {
+    }
+    QAtomicInt ref;
+    QPlatformWindowFormat::FormatOptions opts;
+    int depthSize;
+    int accumSize;
+    int stencilSize;
+    int redSize;
+    int greenSize;
+    int blueSize;
+    int alphaSize;
+    int numSamples;
+    int swapInterval;
+    QPlatformWindowFormat::WindowApi windowApi;
+    QPlatformGLContext *sharedContext;
+};
+
+/*!
+    \class QPlatformWindowFormat
+    \brief The QPlatformWindowFormat class specifies the display format of an OpenGL
+    rendering context and if possible attributes of the corresponding QPlatformWindow.
+
+    \ingroup painting
+
+    QWidget has a setter and getter function for QPlatformWindowFormat. These functions can be used
+    by the application programmer to signal what kind of format he wants to the window and glcontext
+    should have. However, it is not always possible to fulfill these requirements. The application
+    programmer should therefore check the resulting QPlatformWindowFormat from QPlatformGLContext
+    to see the format that was actually created.
+
+    A display format has several characteristics:
+    \list
+    \i \link setDoubleBuffer() Double or single buffering.\endlink
+    \i \link setDepth() Depth buffer.\endlink
+    \i \link setRgba() RGBA or color index mode.\endlink
+    \i \link setAlpha() Alpha channel.\endlink
+    \i \link setAccum() Accumulation buffer.\endlink
+    \i \link setStencil() Stencil buffer.\endlink
+    \i \link setStereo() Stereo buffers.\endlink
+    \i \link setDirectRendering() Direct rendering.\endlink
+    \i \link setOverlay() Presence of an overlay.\endlink
+    \i \link setPlane() Plane of an overlay.\endlink
+    \i \link setSampleBuffers() Multisample buffers.\endlink
+    \endlist
+
+    You can also specify preferred bit depths for the color buffer,
+    depth buffer, alpha buffer, accumulation buffer and the stencil
+    buffer with the functions: setRedBufferSize(), setGreenBufferSize(),
+    setBlueBufferSize(), setDepthBufferSize(), setAlphaBufferSize(),
+    setAccumBufferSize() and setStencilBufferSize().
+
+    Note that even if you specify that you prefer a 32 bit depth
+    buffer (e.g. with setDepthBufferSize(32)), the format that is
+    chosen may not have a 32 bit depth buffer, even if there is a
+    format available with a 32 bit depth buffer. The main reason for
+    this is how the system dependant picking algorithms work on the
+    different platforms, and some format options may have higher
+    precedence than others.
+
+    You create and tell a QPlatformWindowFormat object what rendering options you
+    want from an OpenGL rendering context.
+
+    OpenGL drivers or accelerated hardware may or may not support
+    advanced features such as alpha channel or stereographic viewing.
+    If you request some features that the driver/hardware does not
+    provide when you create a QGLWidget, you will get a rendering
+    context with the nearest subset of features.
+
+    There are different ways to define the display characteristics of
+    a rendering context. One is to create a QPlatformWindowFormat and make it the
+    default for the entire application:
+    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 0
+
+    Or you can specify the desired format when creating an object of
+    your QGLWidget subclass:
+    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 1
+
+    After the widget has been created, you can find out which of the
+    requested features the system was able to provide:
+    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 2
+
+    \legalese
+        OpenGL is a trademark of Silicon Graphics, Inc. in the
+        United States and other countries.
+    \endlegalese
+
+    \sa QPlatformContext, QWidget
+*/
+
+/*!
+    Constructs a QPlatformWindowFormat object with the following default settings:
+    \list
+    \i \link setDoubleBuffer() Double buffer:\endlink Enabled.
+    \i \link setDepth() Depth buffer:\endlink Enabled.
+    \i \link setRgba() RGBA:\endlink Enabled (i.e., color index disabled).
+    \i \link setAlpha() Alpha channel:\endlink Disabled.
+    \i \link setAccum() Accumulator buffer:\endlink Disabled.
+    \i \link setStencil() Stencil buffer:\endlink Enabled.
+    \i \link setStereo() Stereo:\endlink Disabled.
+    \i \link setDirectRendering() Direct rendering:\endlink Enabled.
+    \i \link setOverlay() Overlay:\endlink Disabled.
+    \i \link setPlane() Plane:\endlink 0 (i.e., normal plane).
+    \i \link setSampleBuffers() Multisample buffers:\endlink Disabled.
+    \endlist
+*/
+
+QPlatformWindowFormat::QPlatformWindowFormat()
+{
+    d = new QPlatformWindowFormatPrivate;
+}
+
+
+/*!
+    Creates a QPlatformWindowFormat object that is a copy of the current
+    defaultFormat().
+
+    If \a options is not 0, the default format is modified by the
+    specified format options. The \a options parameter should be
+    QGL::FormatOption values OR'ed together.
+
+    This constructor makes it easy to specify a certain desired format
+    in classes derived from QGLWidget, for example:
+    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 3
+
+    Note that there are QGL::FormatOption values to turn format settings
+    both on and off, e.g. QGL::DepthBuffer and QGL::NoDepthBuffer,
+    QGL::DirectRendering and QGL::IndirectRendering, etc.
+
+    The \a plane parameter defaults to 0 and is the plane which this
+    format should be associated with. Not all OpenGL implementations
+    supports overlay/underlay rendering planes.
+
+    \sa defaultFormat(), setOption(), setPlane()
+*/
+
+QPlatformWindowFormat::QPlatformWindowFormat(QPlatformWindowFormat::FormatOptions options)
+{
+    d = new QPlatformWindowFormatPrivate;
+    QPlatformWindowFormat::FormatOptions newOpts = options;
+    d->opts = defaultFormat().d->opts;
+    d->opts |= (newOpts & 0xffff);
+    d->opts &= ~(newOpts >> 16);
+}
+
+/*!
+    \internal
+*/
+void QPlatformWindowFormat::detach()
+{
+    if (d->ref != 1) {
+        QPlatformWindowFormatPrivate *newd = new QPlatformWindowFormatPrivate(d);
+        if (!d->ref.deref())
+            delete d;
+        d = newd;
+    }
+}
+
+/*!
+    Constructs a copy of \a other.
+*/
+
+QPlatformWindowFormat::QPlatformWindowFormat(const QPlatformWindowFormat &other)
+{
+    d = other.d;
+    d->ref.ref();
+}
+
+/*!
+    Assigns \a other to this object.
+*/
+
+QPlatformWindowFormat &QPlatformWindowFormat::operator=(const QPlatformWindowFormat &other)
+{
+    if (d != other.d) {
+        other.d->ref.ref();
+        if (!d->ref.deref())
+            delete d;
+        d = other.d;
+    }
+    return *this;
+}
+
+/*!
+    Destroys the QPlatformWindowFormat.
+*/
+QPlatformWindowFormat::~QPlatformWindowFormat()
+{
+    if (!d->ref.deref())
+        delete d;
+}
+
+/*!
+    \fn bool QPlatformWindowFormat::doubleBuffer() const
+
+    Returns true if double buffering is enabled; otherwise returns
+    false. Double buffering is enabled by default.
+
+    \sa setDoubleBuffer()
+*/
+
+/*!
+    If \a enable is true sets double buffering; otherwise sets single
+    buffering.
+
+    Double buffering is enabled by default.
+
+    Double buffering is a technique where graphics are rendered on an
+    off-screen buffer and not directly to the screen. When the drawing
+    has been completed, the program calls a swapBuffers() function to
+    exchange the screen contents with the buffer. The result is
+    flicker-free drawing and often better performance.
+
+    \sa doubleBuffer(), QGLContext::swapBuffers(),
+    QGLWidget::swapBuffers()
+*/
+
+void QPlatformWindowFormat::setDoubleBuffer(bool enable)
+{
+    setOption(enable ? QPlatformWindowFormat::DoubleBuffer : QPlatformWindowFormat::SingleBuffer);
+}
+
+
+/*!
+    \fn bool QPlatformWindowFormat::depth() const
+
+    Returns true if the depth buffer is enabled; otherwise returns
+    false. The depth buffer is enabled by default.
+
+    \sa setDepth(), setDepthBufferSize()
+*/
+
+/*!
+    If \a enable is true enables the depth buffer; otherwise disables
+    the depth buffer.
+
+    The depth buffer is enabled by default.
+
+    The purpose of a depth buffer (or Z-buffering) is to remove hidden
+    surfaces. Pixels are assigned Z values based on the distance to
+    the viewer. A pixel with a high Z value is closer to the viewer
+    than a pixel with a low Z value. This information is used to
+    decide whether to draw a pixel or not.
+
+    \sa depth(), setDepthBufferSize()
+*/
+
+void QPlatformWindowFormat::setDepth(bool enable)
+{
+    setOption(enable ? QPlatformWindowFormat::DepthBuffer : QPlatformWindowFormat::NoDepthBuffer);
+}
+
+
+/*!
+    \fn bool QPlatformWindowFormat::rgba() const
+
+    Returns true if RGBA color mode is set. Returns false if color
+    index mode is set. The default color mode is RGBA.
+
+    \sa setRgba()
+*/
+
+/*!
+    If \a enable is true sets RGBA mode. If \a enable is false sets
+    color index mode.
+
+    The default color mode is RGBA.
+
+    RGBA is the preferred mode for most OpenGL applications. In RGBA
+    color mode you specify colors as red + green + blue + alpha
+    quadruplets.
+
+    In color index mode you specify an index into a color lookup
+    table.
+
+    \sa rgba()
+*/
+
+void QPlatformWindowFormat::setRgba(bool enable)
+{
+    setOption(enable ? QPlatformWindowFormat::Rgba : QPlatformWindowFormat::ColorIndex);
+}
+
+
+/*!
+    \fn bool QPlatformWindowFormat::alpha() const
+
+    Returns true if the alpha buffer in the framebuffer is enabled;
+    otherwise returns false. The alpha buffer is disabled by default.
+
+    \sa setAlpha(), setAlphaBufferSize()
+*/
+
+/*!
+    If \a enable is true enables the alpha buffer; otherwise disables
+    the alpha buffer.
+
+    The alpha buffer is disabled by default.
+
+    The alpha buffer is typically used for implementing transparency
+    or translucency. The A in RGBA specifies the transparency of a
+    pixel.
+
+    \sa alpha(), setAlphaBufferSize()
+*/
+
+void QPlatformWindowFormat::setAlpha(bool enable)
+{
+    setOption(enable ? QPlatformWindowFormat::AlphaChannel : QPlatformWindowFormat::NoAlphaChannel);
+}
+
+
+/*!
+    \fn bool QPlatformWindowFormat::accum() const
+
+    Returns true if the accumulation buffer is enabled; otherwise
+    returns false. The accumulation buffer is disabled by default.
+
+    \sa setAccum(), setAccumBufferSize()
+*/
+
+/*!
+    If \a enable is true enables the accumulation buffer; otherwise
+    disables the accumulation buffer.
+
+    The accumulation buffer is disabled by default.
+
+    The accumulation buffer is used to create blur effects and
+    multiple exposures.
+
+    \sa accum(), setAccumBufferSize()
+*/
+
+void QPlatformWindowFormat::setAccum(bool enable)
+{
+    setOption(enable ? QPlatformWindowFormat::AccumBuffer : QPlatformWindowFormat::NoAccumBuffer);
+}
+
+
+/*!
+    \fn bool QPlatformWindowFormat::stencil() const
+
+    Returns true if the stencil buffer is enabled; otherwise returns
+    false. The stencil buffer is enabled by default.
+
+    \sa setStencil(), setStencilBufferSize()
+*/
+
+/*!
+    If \a enable is true enables the stencil buffer; otherwise
+    disables the stencil buffer.
+
+    The stencil buffer is enabled by default.
+
+    The stencil buffer masks certain parts of the drawing area so that
+    masked parts are not drawn on.
+
+    \sa stencil(), setStencilBufferSize()
+*/
+
+void QPlatformWindowFormat::setStencil(bool enable)
+{
+    setOption(enable ? QPlatformWindowFormat::StencilBuffer: QPlatformWindowFormat::NoStencilBuffer);
+}
+
+
+/*!
+    \fn bool QPlatformWindowFormat::stereo() const
+
+    Returns true if stereo buffering is enabled; otherwise returns
+    false. Stereo buffering is disabled by default.
+
+    \sa setStereo()
+*/
+
+/*!
+    If \a enable is true enables stereo buffering; otherwise disables
+    stereo buffering.
+
+    Stereo buffering is disabled by default.
+
+    Stereo buffering provides extra color buffers to generate left-eye
+    and right-eye images.
+
+    \sa stereo()
+*/
+
+void QPlatformWindowFormat::setStereo(bool enable)
+{
+    setOption(enable ? QPlatformWindowFormat::StereoBuffers : QPlatformWindowFormat::NoStereoBuffers);
+}
+
+
+/*!
+    \fn bool QPlatformWindowFormat::directRendering() const
+
+    Returns true if direct rendering is enabled; otherwise returns
+    false.
+
+    Direct rendering is enabled by default.
+
+    \sa setDirectRendering()
+*/
+
+/*!
+    If \a enable is true enables direct rendering; otherwise disables
+    direct rendering.
+
+    Direct rendering is enabled by default.
+
+    Enabling this option will make OpenGL bypass the underlying window
+    system and render directly from hardware to the screen, if this is
+    supported by the system.
+
+    \sa directRendering()
+*/
+
+void QPlatformWindowFormat::setDirectRendering(bool enable)
+{
+    setOption(enable ? QPlatformWindowFormat::DirectRendering : QPlatformWindowFormat::IndirectRendering);
+}
+
+/*!
+    \fn bool QPlatformWindowFormat::sampleBuffers() const
+
+    Returns true if multisample buffer support is enabled; otherwise
+    returns false.
+
+    The multisample buffer is disabled by default.
+
+    \sa setSampleBuffers()
+*/
+
+/*!
+    If \a enable is true, a GL context with multisample buffer support
+    is picked; otherwise ignored.
+
+    \sa sampleBuffers(), setSamples(), samples()
+*/
+void QPlatformWindowFormat::setSampleBuffers(bool enable)
+{
+    setOption(enable ? QPlatformWindowFormat::SampleBuffers : QPlatformWindowFormat::NoSampleBuffers);
+}
+
+/*!
+    Returns the number of samples per pixel when multisampling is
+    enabled. By default, the highest number of samples that is
+    available is used.
+
+    \sa setSampleBuffers(), sampleBuffers(), setSamples()
+*/
+int QPlatformWindowFormat::samples() const
+{
+   return d->numSamples;
+}
+
+/*!
+    Set the preferred number of samples per pixel when multisampling
+    is enabled to \a numSamples. By default, the highest number of
+    samples available is used.
+
+    \sa setSampleBuffers(), sampleBuffers(), samples()
+*/
+void QPlatformWindowFormat::setSamples(int numSamples)
+{
+    detach();
+    if (numSamples < 0) {
+        qWarning("QPlatformWindowFormat::setSamples: Cannot have negative number of samples per pixel %d", numSamples);
+        return;
+    }
+    d->numSamples = numSamples;
+    setSampleBuffers(numSamples > 0);
+}
+
+/*!
+    \since 4.2
+
+    Set the preferred swap interval. This can be used to sync the GL
+    drawing into a system window to the vertical refresh of the screen.
+    Setting an \a interval value of 0 will turn the vertical refresh syncing
+    off, any value higher than 0 will turn the vertical syncing on.
+
+    Under Windows and under X11, where the \c{WGL_EXT_swap_control}
+    and \c{GLX_SGI_video_sync} extensions are used, the \a interval
+    parameter can be used to set the minimum number of video frames
+    that are displayed before a buffer swap will occur. In effect,
+    setting the \a interval to 10, means there will be 10 vertical
+    retraces between every buffer swap.
+
+    Under Windows the \c{WGL_EXT_swap_control} extension has to be present,
+    and under X11 the \c{GLX_SGI_video_sync} extension has to be present.
+*/
+void QPlatformWindowFormat::setSwapInterval(int interval)
+{
+    detach();
+    d->swapInterval = interval;
+}
+
+/*!
+    \since 4.2
+
+    Returns the currently set swap interval. -1 is returned if setting
+    the swap interval isn't supported in the system GL implementation.
+*/
+int QPlatformWindowFormat::swapInterval() const
+{
+    return d->swapInterval;
+}
+
+void QPlatformWindowFormat::setWindowApi(QPlatformWindowFormat::WindowApi api)
+{
+    detach();
+    d->windowApi = api;
+}
+
+QPlatformWindowFormat::WindowApi QPlatformWindowFormat::windowApi() const
+{
+    return d->windowApi;
+}
+
+void QPlatformWindowFormat::setSharedContext(QPlatformGLContext *context)
+{
+    d->sharedContext = context;
+}
+
+QPlatformGLContext *QPlatformWindowFormat::sharedGLContext() const
+{
+    return d->sharedContext;
+}
+
+/*!
+    \fn bool QPlatformWindowFormat::hasWindowSurface() const
+
+    Returns true if the corresponding widget has an instance of QWindowSurface.
+
+    Otherwise returns false.
+
+    WindowSurface is enabled by default.
+
+    \sa setOverlay()
+*/
+
+/*!
+    If \a enable is true a top level QWidget will create a QWindowSurface at creation;
+
+    otherwise the QWidget will only have a QPlatformWindow.
+
+    This is useful for ie. QGLWidget where the QPlatformGLContext controls the surface.
+
+    \sa hasOverlay()
+*/
+
+void QPlatformWindowFormat::setWindowSurface(bool enable)
+{
+    setOption(enable ? QPlatformWindowFormat::HasWindowSurface : QPlatformWindowFormat::NoWindowSurface);
+}
+
+/*!
+    Sets the format option to \a opt.
+
+    \sa testOption()
+*/
+
+void QPlatformWindowFormat::setOption(QPlatformWindowFormat::FormatOptions opt)
+{
+    detach();
+    if (opt & 0xffff)
+        d->opts |= opt;
+    else
+       d->opts &= ~(opt >> 16);
+}
+
+
+
+/*!
+    Returns true if format option \a opt is set; otherwise returns false.
+
+    \sa setOption()
+*/
+
+bool QPlatformWindowFormat::testOption(QPlatformWindowFormat::FormatOptions opt) const
+{
+    if (opt & 0xffff)
+       return (d->opts & opt) != 0;
+    else
+       return (d->opts & (opt >> 16)) == 0;
+}
+
+/*!
+    Set the minimum depth buffer size to \a size.
+
+    \sa depthBufferSize(), setDepth(), depth()
+*/
+void QPlatformWindowFormat::setDepthBufferSize(int size)
+{
+    detach();
+    if (size < 0) {
+        qWarning("QPlatformWindowFormat::setDepthBufferSize: Cannot set negative depth buffer size %d", size);
+        return;
+    }
+    d->depthSize = size;
+    setDepth(size > 0);
+}
+
+/*!
+    Returns the depth buffer size.
+
+    \sa depth(), setDepth(), setDepthBufferSize()
+*/
+int QPlatformWindowFormat::depthBufferSize() const
+{
+   return d->depthSize;
+}
+
+/*!
+    \since 4.2
+
+    Set the preferred red buffer size to \a size.
+
+    \sa setGreenBufferSize(), setBlueBufferSize(), setAlphaBufferSize()
+*/
+void QPlatformWindowFormat::setRedBufferSize(int size)
+{
+    detach();
+    if (size < 0) {
+        qWarning("QPlatformWindowFormat::setRedBufferSize: Cannot set negative red buffer size %d", size);
+        return;
+    }
+    d->redSize = size;
+}
+
+/*!
+    \since 4.2
+
+    Returns the red buffer size.
+
+    \sa setRedBufferSize()
+*/
+int QPlatformWindowFormat::redBufferSize() const
+{
+   return d->redSize;
+}
+
+/*!
+    \since 4.2
+
+    Set the preferred green buffer size to \a size.
+
+    \sa setRedBufferSize(), setBlueBufferSize(), setAlphaBufferSize()
+*/
+void QPlatformWindowFormat::setGreenBufferSize(int size)
+{
+    detach();
+    if (size < 0) {
+        qWarning("QPlatformWindowFormat::setGreenBufferSize: Cannot set negative green buffer size %d", size);
+        return;
+    }
+    d->greenSize = size;
+}
+
+/*!
+    \since 4.2
+
+    Returns the green buffer size.
+
+    \sa setGreenBufferSize()
+*/
+int QPlatformWindowFormat::greenBufferSize() const
+{
+   return d->greenSize;
+}
+
+/*!
+    \since 4.2
+
+    Set the preferred blue buffer size to \a size.
+
+    \sa setRedBufferSize(), setGreenBufferSize(), setAlphaBufferSize()
+*/
+void QPlatformWindowFormat::setBlueBufferSize(int size)
+{
+    detach();
+    if (size < 0) {
+        qWarning("QPlatformWindowFormat::setBlueBufferSize: Cannot set negative blue buffer size %d", size);
+        return;
+    }
+    d->blueSize = size;
+}
+
+/*!
+    \since 4.2
+
+    Returns the blue buffer size.
+
+    \sa setBlueBufferSize()
+*/
+int QPlatformWindowFormat::blueBufferSize() const
+{
+   return d->blueSize;
+}
+
+/*!
+    Set the preferred alpha buffer size to \a size.
+    This function implicitly enables the alpha channel.
+
+    \sa setRedBufferSize(), setGreenBufferSize(), alphaBufferSize()
+*/
+void QPlatformWindowFormat::setAlphaBufferSize(int size)
+{
+    detach();
+    if (size < 0) {
+        qWarning("QPlatformWindowFormat::setAlphaBufferSize: Cannot set negative alpha buffer size %d", size);
+        return;
+    }
+    d->alphaSize = size;
+    setAlpha(size > 0);
+}
+
+/*!
+    Returns the alpha buffer size.
+
+    \sa alpha(), setAlpha(), setAlphaBufferSize()
+*/
+int QPlatformWindowFormat::alphaBufferSize() const
+{
+   return d->alphaSize;
+}
+
+/*!
+    Set the preferred accumulation buffer size, where \a size is the
+    bit depth for each RGBA component.
+
+    \sa accum(), setAccum(), accumBufferSize()
+*/
+void QPlatformWindowFormat::setAccumBufferSize(int size)
+{
+    detach();
+    if (size < 0) {
+        qWarning("QPlatformWindowFormat::setAccumBufferSize: Cannot set negative accumulate buffer size %d", size);
+        return;
+    }
+    d->accumSize = size;
+    setAccum(size > 0);
+}
+
+/*!
+    Returns the accumulation buffer size.
+
+    \sa setAccumBufferSize(), accum(), setAccum()
+*/
+int QPlatformWindowFormat::accumBufferSize() const
+{
+   return d->accumSize;
+}
+
+/*!
+    Set the preferred stencil buffer size to \a size.
+
+    \sa stencilBufferSize(), setStencil(), stencil()
+*/
+void QPlatformWindowFormat::setStencilBufferSize(int size)
+{
+    detach();
+    if (size < 0) {
+        qWarning("QPlatformWindowFormat::setStencilBufferSize: Cannot set negative stencil buffer size %d", size);
+        return;
+    }
+    d->stencilSize = size;
+    setStencil(size > 0);
+}
+
+/*!
+    Returns the stencil buffer size.
+
+    \sa stencil(), setStencil(), setStencilBufferSize()
+*/
+int QPlatformWindowFormat::stencilBufferSize() const
+{
+   return d->stencilSize;
+}
+
+/*!
+    Returns the default QPlatformWindowFormat for the application. All QGLWidget
+    objects that are created use this format unless another format is
+    specified, e.g. when they are constructed.
+
+    If no special default format has been set using
+    setDefaultFormat(), the default format is the same as that created
+    with QPlatformWindowFormat().
+
+    \sa setDefaultFormat()
+*/
+
+QPlatformWindowFormat QPlatformWindowFormat::defaultFormat()
+{
+    return *q_platformwindow_default_format();
+}
+
+/*!
+    Sets a new default QPlatformWindowFormat for the application to \a f. For
+    example, to set single buffering as the default instead of double
+    buffering, your main() might contain code like this:
+    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 4
+
+    \sa defaultFormat()
+*/
+
+void QPlatformWindowFormat::setDefaultFormat(const QPlatformWindowFormat &f)
+{
+    *q_platformwindow_default_format() = f;
+}
+
+
+/*!
+    Returns the default QPlatformWindowFormat for overlay contexts.
+
+    The default overlay format is:
+    \list
+    \i \link setDoubleBuffer() Double buffer:\endlink Disabled.
+    \i \link setDepth() Depth buffer:\endlink Disabled.
+    \i \link setRgba() RGBA:\endlink Disabled (i.e., color index enabled).
+    \i \link setAlpha() Alpha channel:\endlink Disabled.
+    \i \link setAccum() Accumulator buffer:\endlink Disabled.
+    \i \link setStencil() Stencil buffer:\endlink Disabled.
+    \i \link setStereo() Stereo:\endlink Disabled.
+    \i \link setDirectRendering() Direct rendering:\endlink Enabled.
+    \i \link setOverlay() Overlay:\endlink Disabled.
+    \i \link setSampleBuffers() Multisample buffers:\endlink Disabled.
+    \i \link setPlane() Plane:\endlink 1 (i.e., first overlay plane).
+    \endlist
+
+    \sa setDefaultFormat()
+*/
+
+//QPlatformWindowFormat QPlatformWindowFormat::defaultOverlayFormat()
+//{
+//    return *defaultOverlayFormatInstance();
+//}
+
+///*!
+//    Sets a new default QPlatformWindowFormat for overlay contexts to \a f. This
+//    format is used whenever a QGLWidget is created with a format that
+//    hasOverlay() enabled.
+
+//    For example, to get a double buffered overlay context (if
+//    available), use code like this:
+
+//    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 5
+
+//    As usual, you can find out after widget creation whether the
+//    underlying OpenGL system was able to provide the requested
+//    specification:
+
+//    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 6
+
+//    \sa defaultOverlayFormat()
+//*/
+
+//void QPlatformWindowFormat::setDefaultOverlayFormat(const QPlatformWindowFormat &f)
+//{
+//    QPlatformWindowFormat *defaultFormat = defaultOverlayFormatInstance();
+//    *defaultFormat = f;
+//    // Make sure the user doesn't request that the overlays themselves
+//    // have overlays, since it is unlikely that the system supports
+//    // infinitely many planes...
+//    defaultFormat->setOverlay(false);
+//}
+
+
+/*!
+    Returns true if all the options of the two QPlatformWindowFormat objects
+    \a a and \a b are equal; otherwise returns false.
+
+    \relates QPlatformWindowFormat
+*/
+
+bool operator==(const QPlatformWindowFormat& a, const QPlatformWindowFormat& b)
+{
+    return (a.d == b.d) || ((int) a.d->opts == (int) b.d->opts
+        && a.d->alphaSize == b.d->alphaSize
+        && a.d->accumSize == b.d->accumSize
+        && a.d->stencilSize == b.d->stencilSize
+        && a.d->depthSize == b.d->depthSize
+        && a.d->redSize == b.d->redSize
+        && a.d->greenSize == b.d->greenSize
+        && a.d->blueSize == b.d->blueSize
+        && a.d->numSamples == b.d->numSamples
+        && a.d->swapInterval == b.d->swapInterval
+        && a.d->windowApi == b.d->windowApi);
+}
+
+
+/*!
+    Returns false if all the options of the two QPlatformWindowFormat objects
+    \a a and \a b are equal; otherwise returns true.
+
+    \relates QPlatformWindowFormat
+*/
+
+bool operator!=(const QPlatformWindowFormat& a, const QPlatformWindowFormat& b)
+{
+    return !(a == b);
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+QDebug operator<<(QDebug dbg, const QPlatformWindowFormat &f)
+{
+    const QPlatformWindowFormatPrivate * const d = f.d;
+
+    dbg.nospace() << "QGLFormat("
+                  << "options " << d->opts
+                  << ", depthBufferSize " << d->depthSize
+                  << ", accumBufferSize " << d->accumSize
+                  << ", stencilBufferSize " << d->stencilSize
+                  << ", redBufferSize " << d->redSize
+                  << ", greenBufferSize " << d->greenSize
+                  << ", blueBufferSize " << d->blueSize
+                  << ", alphaBufferSize " << d->alphaSize
+                  << ", samples " << d->numSamples
+                  << ", swapInterval " << d->swapInterval
+                  << ')';
+
+    return dbg.space();
+}
+#endif