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

1 files changed, 383 insertions, 0 deletions

diff --git a/src/gui/painting/qwindowsurface.cpp b/src/gui/painting/qwindowsurface.cpp
new file mode 100644
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+++ b/src/gui/painting/qwindowsurface.cpp
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+/****************************************************************************
+**
+** 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 <private/qwindowsurface_p.h>
+#include <qwidget.h>
+#include <private/qwidget_p.h>
+#include <private/qbackingstore_p.h>
+#include <private/qapplication_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QWindowSurfacePrivate
+{
+public:
+    QWindowSurfacePrivate(QWidget *w)
+        : window(w)
+    {
+    }
+
+    QWidget *window;
+#if !defined(Q_WS_QPA)
+    QRect geometry;
+#else
+    QSize size;
+#endif //Q_WS_QPA
+    QRegion staticContents;
+    QList<QImage*> bufferImages;
+};
+
+/*!
+    \class QWindowSurface
+    \since 4.3
+    \internal
+    \preliminary
+    \ingroup qws qpa
+
+    \brief The QWindowSurface class provides the drawing area for top-level
+    windows.
+*/
+
+
+/*!
+    \fn void QWindowSurface::beginPaint(const QRegion &region)
+
+    This function is called before painting onto the surface begins,
+    with the \a region in which the painting will occur.
+
+    \sa endPaint(), paintDevice()
+*/
+
+/*!
+    \fn void QWindowSurface::endPaint(const QRegion &region)
+
+    This function is called after painting onto the surface has ended,
+    with the \a region in which the painting was performed.
+
+    \sa beginPaint(), paintDevice()
+*/
+
+/*!
+    \fn void QWindowSurface::flush(QWidget *widget, const QRegion &region,
+                                  const QPoint &offset)
+
+    Flushes the given \a region from the specified \a widget onto the
+    screen.
+
+    Note that the \a offset parameter is currently unused.
+*/
+
+/*!
+    \fn QPaintDevice* QWindowSurface::paintDevice()
+
+    Implement this function to return the appropriate paint device.
+*/
+
+/*!
+    Constructs an empty surface for the given top-level \a window.
+*/
+QWindowSurface::QWindowSurface(QWidget *window, bool setDefaultSurface)
+    : d_ptr(new QWindowSurfacePrivate(window))
+{
+    if (!QApplicationPrivate::runtime_graphics_system) {
+        if(setDefaultSurface && window)
+            window->setWindowSurface(this);
+    }
+}
+
+/*!
+    Destroys this surface.
+*/
+QWindowSurface::~QWindowSurface()
+{
+    if (d_ptr->window)
+        d_ptr->window->d_func()->extra->topextra->windowSurface = 0;
+    delete d_ptr;
+}
+
+/*!
+    Returns a pointer to the top-level window associated with this
+    surface.
+*/
+QWidget* QWindowSurface::window() const
+{
+    return d_ptr->window;
+}
+
+void QWindowSurface::beginPaint(const QRegion &)
+{
+}
+
+void QWindowSurface::endPaint(const QRegion &)
+{
+//     QApplication::syncX();
+    qDeleteAll(d_ptr->bufferImages);
+    d_ptr->bufferImages.clear();
+}
+
+#if !defined(Q_WS_QPA)
+/*!
+    Sets the currently allocated area to be the given \a rect.
+
+    This function is called whenever area covered by the top-level
+    window changes.
+
+    \sa geometry()
+*/
+void QWindowSurface::setGeometry(const QRect &rect)
+{
+    d_ptr->geometry = rect;
+}
+
+/*!
+    Returns the currently allocated area on the screen.
+*/
+QRect QWindowSurface::geometry() const
+{
+    return d_ptr->geometry;
+}
+#else
+
+/*!
+      Sets the size of the windowsurface to be \a size.
+
+      \sa size()
+*/
+void QWindowSurface::resize(const QSize &size)
+{
+    d_ptr->size = size;
+}
+
+/*!
+    Returns the current size of the windowsurface.
+*/
+QSize QWindowSurface::size() const
+{
+    return d_ptr->size;
+}
+#endif //Q_WS_QPA
+
+/*!
+    Scrolls the given \a area \a dx pixels to the right and \a dy
+    downward; both \a dx and \a dy may be negative.
+
+    Returns true if the area was scrolled successfully; false otherwise.
+*/
+bool QWindowSurface::scroll(const QRegion &area, int dx, int dy)
+{
+    Q_UNUSED(area);
+    Q_UNUSED(dx);
+    Q_UNUSED(dy);
+
+    return false;
+}
+
+/*!
+    Returns a QImage pointer which represents the actual buffer the \a widget
+    is drawn into or 0 if this is unavailable.
+
+    You must call beginPaint() before you call this function and the returned
+    pointer is only valid until endPaint() is called.
+*/
+QImage* QWindowSurface::buffer(const QWidget *widget)
+{
+    if (widget->window() != window())
+        return 0;
+
+    QPaintDevice *pdev = paintDevice();
+    if (!pdev || pdev->devType() != QInternal::Image)
+        return 0;
+
+    const QPoint off = offset(widget);
+    QImage *img = static_cast<QImage*>(pdev);
+
+    QRect rect(off, widget->size());
+    rect &= QRect(QPoint(), img->size());
+
+    if (rect.isEmpty())
+        return 0;
+
+    img = new QImage(img->scanLine(rect.y()) + rect.x() * img->depth() / 8,
+                     rect.width(), rect.height(),
+                     img->bytesPerLine(), img->format());
+    d_ptr->bufferImages.append(img);
+
+    return img;
+}
+
+/*!
+  Returns a QPixmap generated from the part of the backing store
+  corresponding to \a widget. Returns a null QPixmap if an error
+  occurs. The contents of the pixmap are only defined for the regions
+  of \a widget that have received paint events since the last resize
+  of the backing store.
+
+  If \a rectangle is a null rectangle (the default), the entire widget
+  is grabbed. Otherwise, the grabbed area is limited to \a rectangle.
+
+  The default implementation uses QWindowSurface::buffer().
+
+  \sa QPixmap::grabWidget()
+*/
+QPixmap QWindowSurface::grabWidget(const QWidget *widget, const QRect &rectangle) const
+{
+    QPixmap result;
+
+    if (widget->window() != window())
+        return result;
+
+    const QImage *img = const_cast<QWindowSurface *>(this)->buffer(widget->window());
+
+    if (!img || img->isNull())
+        return result;
+
+    QRect rect = rectangle.isEmpty() ? widget->rect() : (widget->rect() & rectangle);
+
+    rect.translate(offset(widget) - offset(widget->window()));
+    rect &= QRect(QPoint(), img->size());
+
+    if (rect.isEmpty())
+        return result;
+
+    QImage subimg(img->scanLine(rect.y()) + rect.x() * img->depth() / 8,
+                  rect.width(), rect.height(),
+                  img->bytesPerLine(), img->format());
+    subimg.detach(); //### expensive -- maybe we should have a real SubImage that shares reference count
+
+    result = QPixmap::fromImage(subimg);
+    return result;
+}
+
+/*!
+  Returns the offset of \a widget in the coordinates of this
+  window surface.
+ */
+QPoint QWindowSurface::offset(const QWidget *widget) const
+{
+    QWidget *window = d_ptr->window;
+    QPoint offset = widget->mapTo(window, QPoint());
+#ifdef Q_WS_QWS
+    offset += window->geometry().topLeft() - window->frameGeometry().topLeft();
+#endif
+    return offset;
+}
+
+/*!
+  \fn QRect QWindowSurface::rect(const QWidget *widget) const
+
+  Returns the rectangle for \a widget in the coordinates of this
+  window surface.
+*/
+
+void QWindowSurface::setStaticContents(const QRegion &region)
+{
+    d_ptr->staticContents = region;
+}
+
+QRegion QWindowSurface::staticContents() const
+{
+    return d_ptr->staticContents;
+}
+
+bool QWindowSurface::hasStaticContents() const
+{
+    return hasFeature(QWindowSurface::StaticContents) && !d_ptr->staticContents.isEmpty();
+}
+
+QWindowSurface::WindowSurfaceFeatures QWindowSurface::features() const
+{
+    return PartialUpdates | PreservedContents;
+}
+
+#ifdef Q_WS_QPA
+#define Q_EXPORT_SCROLLRECT Q_GUI_EXPORT
+#else
+#define Q_EXPORT_SCROLLRECT
+#endif
+
+void Q_EXPORT_SCROLLRECT qt_scrollRectInImage(QImage &img, const QRect &rect, const QPoint &offset)
+{
+    // make sure we don't detach
+    uchar *mem = const_cast<uchar*>(const_cast<const QImage &>(img).bits());
+
+    int lineskip = img.bytesPerLine();
+    int depth = img.depth() >> 3;
+
+    const QRect imageRect(0, 0, img.width(), img.height());
+    const QRect r = rect & imageRect & imageRect.translated(-offset);
+    const QPoint p = rect.topLeft() + offset;
+
+    if (r.isEmpty())
+        return;
+
+    const uchar *src;
+    uchar *dest;
+
+    if (r.top() < p.y()) {
+        src = mem + r.bottom() * lineskip + r.left() * depth;
+        dest = mem + (p.y() + r.height() - 1) * lineskip + p.x() * depth;
+        lineskip = -lineskip;
+    } else {
+        src = mem + r.top() * lineskip + r.left() * depth;
+        dest = mem + p.y() * lineskip + p.x() * depth;
+    }
+
+    const int w = r.width();
+    int h = r.height();
+    const int bytes = w * depth;
+
+    // overlapping segments?
+    if (offset.y() == 0 && qAbs(offset.x()) < w) {
+        do {
+            ::memmove(dest, src, bytes);
+            dest += lineskip;
+            src += lineskip;
+        } while (--h);
+    } else {
+        do {
+            ::memcpy(dest, src, bytes);
+            dest += lineskip;
+            src += lineskip;
+        } while (--h);
+    }
+}
+
+QT_END_NAMESPACE