Merge remote branch 'qt/4.7' into lighthouse-4.7

Conflicts:
	src/gui/egl/egl.pri
	src/gui/painting/qwindowsurface_p.h

18 files changed, 358 insertions, 225 deletions

diff --git a/src/opengl/gl2paintengineex/qglengineshadersource_p.h b/src/opengl/gl2paintengineex/qglengineshadersource_p.h
index 3379296..8dba951 100644
--- a/src/opengl/gl2paintengineex/qglengineshadersource_p.h
+++ b/src/opengl/gl2paintengineex/qglengineshadersource_p.h
@@ -282,7 +282,7 @@ static const char* const qglslPositionWithTextureBrushVertexShader = "\n\
     uniform   mediump vec2      halfViewportSize; \n\
     uniform   highp   vec2      invertedTextureSize; \n\
     uniform   highp   mat3      brushTransform; \n\
-    varying   highp   vec2      textureCoords; \n\
+    varying   highp   vec2      brushTextureCoords; \n\
     void setPosition(void) \n\
     { \n\
         highp mat3 pmvMatrix = mat3(pmvMatrix1, pmvMatrix2, pmvMatrix3); \n\
@@ -292,7 +292,7 @@ static const char* const qglslPositionWithTextureBrushVertexShader = "\n\
         mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1); \n\
         mediump float invertedHTexCoordsZ = 1.0 / hTexCoords.z; \n\
         gl_Position = vec4(gl_Position.xy * invertedHTexCoordsZ, 0.0, invertedHTexCoordsZ); \n\
-        textureCoords.xy = (hTexCoords.xy * invertedTextureSize) * gl_Position.w; \n\
+        brushTextureCoords.xy = (hTexCoords.xy * invertedTextureSize) * gl_Position.w; \n\
     }\n";
 
 static const char* const qglslAffinePositionWithTextureBrushVertexShader
@@ -303,28 +303,28 @@ static const char* const qglslAffinePositionWithTextureBrushVertexShader
 // we emulate GL_REPEAT by only taking the fractional part of the texture coords.
 // TODO: Special case POT textures which don't need this emulation
 static const char* const qglslTextureBrushSrcFragmentShader = "\n\
-    varying highp   vec2      textureCoords; \n\
+    varying highp   vec2      brushTextureCoords; \n\
     uniform lowp    sampler2D brushTexture; \n\
     lowp vec4 srcPixel() { \n\
-        return texture2D(brushTexture, fract(textureCoords)); \n\
+        return texture2D(brushTexture, fract(brushTextureCoords)); \n\
     }\n";
 #else
 static const char* const qglslTextureBrushSrcFragmentShader = "\n\
-    varying   highp   vec2      textureCoords; \n\
+    varying   highp   vec2      brushTextureCoords; \n\
     uniform   lowp    sampler2D brushTexture; \n\
     lowp vec4 srcPixel() \n\
     { \n\
-        return texture2D(brushTexture, textureCoords); \n\
+        return texture2D(brushTexture, brushTextureCoords); \n\
     }\n";
 #endif
 
 static const char* const qglslTextureBrushSrcWithPatternFragmentShader = "\n\
-    varying   highp   vec2      textureCoords; \n\
+    varying   highp   vec2      brushTextureCoords; \n\
     uniform   lowp    vec4      patternColor; \n\
     uniform   lowp    sampler2D brushTexture; \n\
     lowp vec4 srcPixel() \n\
     { \n\
-        return patternColor * (1.0 - texture2D(brushTexture, textureCoords).r); \n\
+        return patternColor * (1.0 - texture2D(brushTexture, brushTextureCoords).r); \n\
     }\n";
 
 // Solid Fill Brush
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
index c89d34f..4461358 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
@@ -573,9 +573,9 @@ void QGL2PaintEngineExPrivate::resetGLState()
     glStencilMask(0xff);
     glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
     glStencilFunc(GL_ALWAYS, 0, 0xff);
-    glDisableVertexAttribArray(QT_TEXTURE_COORDS_ATTR);
-    glDisableVertexAttribArray(QT_VERTEX_COORDS_ATTR);
-    glDisableVertexAttribArray(QT_OPACITY_ATTR);
+    ctx->d_func()->setVertexAttribArrayEnabled(QT_TEXTURE_COORDS_ATTR, false);
+    ctx->d_func()->setVertexAttribArrayEnabled(QT_VERTEX_COORDS_ATTR, false);
+    ctx->d_func()->setVertexAttribArrayEnabled(QT_OPACITY_ATTR, false);
 #ifndef QT_OPENGL_ES_2
     glColor4f(1.0f, 1.0f, 1.0f, 1.0f); // color may have been changed by glVertexAttrib()
 #endif
@@ -1337,9 +1337,12 @@ void QGL2PaintEngineEx::drawStaticTextItem(QStaticTextItem *textItem)
     d->drawCachedGlyphs(glyphType, textItem, true);
 }
 
-void QGL2PaintEngineEx::drawTexture(const QRectF &dest, GLuint textureId, const QSize &size, const QRectF &src)
+bool QGL2PaintEngineEx::drawTexture(const QRectF &dest, GLuint textureId, const QSize &size, const QRectF &src)
 {
     Q_D(QGL2PaintEngineEx);
+    if (!d->shaderManager)
+        return false;
+
     ensureActive();
     d->transferMode(ImageDrawingMode);
 
@@ -1354,6 +1357,7 @@ void QGL2PaintEngineEx::drawTexture(const QRectF &dest, GLuint textureId, const
     d->updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
                            state()->renderHints & QPainter::SmoothPixmapTransform, textureId);
     d->drawTexture(dest, srcRect, size, false);
+    return true;
 }
 
 void QGL2PaintEngineEx::drawTextItem(const QPointF &p, const QTextItem &textItem)
@@ -1807,27 +1811,6 @@ bool QGL2PaintEngineEx::begin(QPaintDevice *pdev)
     d->dirtyStencilRegion = QRect(0, 0, d->width, d->height);
     d->stencilClean = true;
 
-    switch (pdev->devType()) {
-    case QInternal::Pixmap:
-        d->deviceHasAlpha = static_cast<QPixmap *>(pdev)->hasAlphaChannel();
-        break;
-    case QInternal::FramebufferObject:
-        {
-            GLenum f = static_cast<QGLFramebufferObject *>(pdev)->format().internalTextureFormat();
-#ifndef QT_OPENGL_ES
-            d->deviceHasAlpha = (f != GL_RGB && f != GL_RGB5 && f != GL_RGB8);
-#else
-            d->deviceHasAlpha = (f == GL_RGBA);
-#endif
-        }
-        break;
-    default:
-        // widget, pbuffer
-        d->deviceHasAlpha = d->ctx->d_func()->reqFormat.alpha();
-        break;
-    }
-
-
     // Calling begin paint should make the correct context current. So, any
     // code which calls into GL or otherwise needs a current context *must*
     // go after beginPaint:
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
index 2ac2ca4..6ba0c42 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
@@ -123,7 +123,6 @@ public:
     virtual void renderHintsChanged();
     virtual void transformChanged();
 
-    virtual void drawTexture(const QRectF &r, GLuint textureId, const QSize &size, const QRectF &sr);
     virtual void drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr);
     virtual void drawPixmapFragments(const QPainter::PixmapFragment *fragments, int fragmentCount, const QPixmap &pixmap,
                                      QPainter::PixmapFragmentHints hints);
@@ -136,6 +135,8 @@ public:
 
     virtual void drawStaticTextItem(QStaticTextItem *textItem);
 
+    bool drawTexture(const QRectF &r, GLuint textureId, const QSize &size, const QRectF &sr);
+
     Type type() const { return OpenGL2; }
 
     virtual void setState(QPainterState *s);
@@ -290,7 +291,6 @@ public:
 
     bool needsSync;
     bool multisamplingAlwaysEnabled;
-    bool deviceHasAlpha;
 
     GLfloat depthRange[2];
 
diff --git a/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h b/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h
index 04731b1..75c2bb1 100644
--- a/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h
+++ b/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h
@@ -62,7 +62,7 @@ QT_BEGIN_NAMESPACE
 
 class QGL2PaintEngineExPrivate;
 
-class QGLTextureGlyphCache : public QObject, public QTextureGlyphCache
+class Q_OPENGL_EXPORT QGLTextureGlyphCache : public QObject, public QTextureGlyphCache
 {
     Q_OBJECT
 public:
diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index 26eb1e7..634231d 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -1259,11 +1259,24 @@ QGLFormat::OpenGLVersionFlags Q_AUTOTEST_EXPORT qOpenGLVersionFlagsFromString(co
                 versionFlags |= QGLFormat::OpenGL_Version_3_2;
             case '1':
                 versionFlags |= QGLFormat::OpenGL_Version_3_1;
+            case '0':
+                break;
             default:
+                versionFlags |= QGLFormat::OpenGL_Version_3_1 |
+                                QGLFormat::OpenGL_Version_3_2;
                 break;
             }
         } else {
-            qWarning("Unrecognised OpenGL version");
+            versionFlags |= QGLFormat::OpenGL_Version_1_1 |
+                            QGLFormat::OpenGL_Version_1_2 |
+                            QGLFormat::OpenGL_Version_1_3 |
+                            QGLFormat::OpenGL_Version_1_4 |
+                            QGLFormat::OpenGL_Version_1_5 |
+                            QGLFormat::OpenGL_Version_2_0 |
+                            QGLFormat::OpenGL_Version_2_1 |
+                            QGLFormat::OpenGL_Version_3_0 |
+                            QGLFormat::OpenGL_Version_3_1 |
+                            QGLFormat::OpenGL_Version_3_2;
         }
     }
     return versionFlags;
@@ -1644,7 +1657,14 @@ static void convertFromGLImage(QImage &img, int w, int h, bool alpha_format, boo
             uint *q = (uint*)img.scanLine(y);
             for (int x=0; x < w; ++x) {
                 const uint pixel = *q;
-                *q = ((pixel << 16) & 0xff0000) | ((pixel >> 16) & 0xff) | (pixel & 0xff00ff00);
+                if (alpha_format && include_alpha) {
+                    *q = ((pixel << 16) & 0xff0000) | ((pixel >> 16) & 0xff)
+                         | (pixel & 0xff00ff00);
+                } else {
+                    *q = 0xff000000 | ((pixel << 16) & 0xff0000)
+                         | ((pixel >> 16) & 0xff) | (pixel & 0x00ff00);
+                }
+
                 q++;
             }
         }
@@ -1655,7 +1675,8 @@ static void convertFromGLImage(QImage &img, int w, int h, bool alpha_format, boo
 
 QImage qt_gl_read_framebuffer(const QSize &size, bool alpha_format, bool include_alpha)
 {
-    QImage img(size, alpha_format ? QImage::Format_ARGB32 : QImage::Format_RGB32);
+    QImage img(size, (alpha_format && include_alpha) ? QImage::Format_ARGB32
+                                                     : QImage::Format_RGB32);
     int w = size.width();
     int h = size.height();
     glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, img.bits());
@@ -2781,8 +2802,8 @@ void QGLContext::drawTexture(const QRectF &target, GLuint textureId, GLenum text
          if (!eng->isNativePaintingActive()) {
             QRectF src(0, 0, target.width(), target.height());
             QSize size(target.width(), target.height());
-            eng->drawTexture(target, textureId, size, src);
-            return;
+            if (eng->drawTexture(target, textureId, size, src))
+                return;
         }
      }
 
@@ -2857,8 +2878,8 @@ void QGLContext::drawTexture(const QPointF &point, GLuint textureId, GLenum text
             QRectF dest(point, QSizeF(textureWidth, textureHeight));
             QRectF src(0, 0, textureWidth, textureHeight);
             QSize size(textureWidth, textureHeight);
-            eng->drawTexture(dest, textureId, size, src);
-            return;
+            if (eng->drawTexture(dest, textureId, size, src))
+                return;
         }
     }
 
@@ -3991,7 +4012,7 @@ bool QGLWidget::event(QEvent *e)
     if ((e->type() == QEvent::ParentChange) || (e->type() == QEvent::WindowStateChange)) {
         // The window may have been re-created during re-parent or state change - if so, the EGL
         // surface will need to be re-created.
-        d->recreateEglSurface(false);
+        d->recreateEglSurface();
     }
 #endif
 #elif defined(Q_WS_WIN)
@@ -5168,11 +5189,17 @@ Q_OPENGL_EXPORT void qt_set_gl_library_name(const QString& name)
 Q_OPENGL_EXPORT const QString qt_gl_library_name()
 {
     if (qt_gl_lib_name()->isNull()) {
-#if defined(Q_WS_X11) || defined(Q_WS_QWS)
-        return QLatin1String("GL");
-#else // Q_WS_MAC
+#ifdef Q_WS_MAC
         return QLatin1String("/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib");
-#endif
+#else
+# if defined(QT_OPENGL_ES_1)
+        return QLatin1String("GLES_CM");
+# elif defined(QT_OPENGL_ES_2)
+        return QLatin1String("GLESv2");
+# else
+        return QLatin1String("GL");
+# endif
+#endif // defined Q_WS_MAC
     }
     return *qt_gl_lib_name();
 }
diff --git a/src/opengl/qgl.h b/src/opengl/qgl.h
index e389e3f..701aa8e 100644
--- a/src/opengl/qgl.h
+++ b/src/opengl/qgl.h
@@ -436,6 +436,7 @@ private:
     friend class QGLFBOGLPaintDevice;
     friend class QGLPaintDevice;
     friend class QX11GLPixmapData;
+    friend class QX11GLSharedContexts;
 private:
     Q_DISABLE_COPY(QGLContext)
 };
diff --git a/src/opengl/qgl_p.h b/src/opengl/qgl_p.h
index a2445b7..37466d8 100644
--- a/src/opengl/qgl_p.h
+++ b/src/opengl/qgl_p.h
@@ -199,7 +199,7 @@ public:
 #elif defined(Q_WS_X11)
     QGLOverlayWidget *olw;
 #ifndef QT_NO_EGL
-    void recreateEglSurface(bool force);
+    void recreateEglSurface();
     WId eglSurfaceWindowId;
 #endif
 #elif defined(Q_WS_MAC)
diff --git a/src/opengl/qgl_x11egl.cpp b/src/opengl/qgl_x11egl.cpp
index d67a3ea..9d28de0 100644
--- a/src/opengl/qgl_x11egl.cpp
+++ b/src/opengl/qgl_x11egl.cpp
@@ -335,24 +335,23 @@ void QGLWidget::setColormap(const QGLColormap &)
 {
 }
 
-// Re-creates the EGL surface if the window ID has changed or if force is true
-void QGLWidgetPrivate::recreateEglSurface(bool force)
+// Re-creates the EGL surface if the window ID has changed or if there isn't a surface
+void QGLWidgetPrivate::recreateEglSurface()
 {
     Q_Q(QGLWidget);
 
     Window currentId = q->winId();
 
-    if ( force || (currentId != eglSurfaceWindowId) ) {
-        // The window id has changed so we need to re-create the EGL surface
-        QEglContext *ctx = glcx->d_func()->eglContext;
-        EGLSurface surface = glcx->d_func()->eglSurface;
-        if (surface != EGL_NO_SURFACE)
-            ctx->destroySurface(surface); // Will force doneCurrent() if nec.
-        surface = ctx->createSurface(q);
-        if (surface == EGL_NO_SURFACE)
-            qWarning("Error creating EGL window surface: 0x%x", eglGetError());
-        glcx->d_func()->eglSurface = surface;
+    // If the window ID has changed since the surface was created, we need to delete the
+    // old surface before re-creating a new one. Note: This should not be the case as the
+    // surface should be deleted before the old window id.
+    if (glcx->d_func()->eglSurface != EGL_NO_SURFACE && (currentId != eglSurfaceWindowId)) {
+        qWarning("EGL surface for deleted window %x was not destroyed", eglSurfaceWindowId);
+        glcx->d_func()->destroyEglSurfaceForDevice();
+    }
 
+    if (glcx->d_func()->eglSurface == EGL_NO_SURFACE) {
+        glcx->d_func()->eglSurface = glcx->d_func()->eglContext->createSurface(q);
         eglSurfaceWindowId = currentId;
     }
 }
diff --git a/src/opengl/qglextensions.cpp b/src/opengl/qglextensions.cpp
index ef3c4cd..8e2bbd4 100644
--- a/src/opengl/qglextensions.cpp
+++ b/src/opengl/qglextensions.cpp
@@ -235,11 +235,6 @@ bool qt_resolve_eglimage_gl_extensions(QGLContext *ctx)
 
 bool qt_resolve_glsl_extensions(QGLContext *ctx)
 {
-    // Geometry shaders are optional...
-    glProgramParameteriEXT = (_glProgramParameteriEXT) ctx->getProcAddress(QLatin1String("glProgramParameteriEXT"));
-    glFramebufferTextureEXT = (_glFramebufferTextureEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureEXT"));
-    glFramebufferTextureLayerEXT = (_glFramebufferTextureLayerEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureLayerEXT"));
-    glFramebufferTextureFaceEXT = (_glFramebufferTextureFaceEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureFaceEXT"));
 
 #if defined(QT_OPENGL_ES_2)
     // The GLSL shader functions are always present in OpenGL/ES 2.0.
@@ -254,6 +249,12 @@ bool qt_resolve_glsl_extensions(QGLContext *ctx)
     if (glCreateShader)
         return true;
 
+    // Geometry shaders are optional...
+    glProgramParameteriEXT = (_glProgramParameteriEXT) ctx->getProcAddress(QLatin1String("glProgramParameteriEXT"));
+    glFramebufferTextureEXT = (_glFramebufferTextureEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureEXT"));
+    glFramebufferTextureLayerEXT = (_glFramebufferTextureLayerEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureLayerEXT"));
+    glFramebufferTextureFaceEXT = (_glFramebufferTextureFaceEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureFaceEXT"));
+
     glCreateShader = (_glCreateShader) ctx->getProcAddress(QLatin1String("glCreateShader"));
     if (glCreateShader) {
         glShaderSource = (_glShaderSource) ctx->getProcAddress(QLatin1String("glShaderSource"));
diff --git a/src/opengl/qglpaintdevice.cpp b/src/opengl/qglpaintdevice.cpp
index 2d82222..e874e85 100644
--- a/src/opengl/qglpaintdevice.cpp
+++ b/src/opengl/qglpaintdevice.cpp
@@ -63,6 +63,22 @@ QGLPaintDevice::~QGLPaintDevice()
 {
 }
 
+int QGLPaintDevice::metric(QPaintDevice::PaintDeviceMetric metric) const
+{
+    switch(metric) {
+    case PdmWidth:
+        return size().width();
+    case PdmHeight:
+        return size().height();
+    case PdmDepth: {
+        const QGLFormat f = format();
+        return f.redBufferSize() + f.greenBufferSize() + f.blueBufferSize() + f.alphaBufferSize();
+    }
+    default:
+        qWarning("QGLPaintDevice::metric() - metric %d not known", metric);
+        return 0;
+    }
+}
 
 void QGLPaintDevice::beginPaint()
 {
diff --git a/src/opengl/qglpaintdevice_p.h b/src/opengl/qglpaintdevice_p.h
index 3d669da..04f9c3c 100644
--- a/src/opengl/qglpaintdevice_p.h
+++ b/src/opengl/qglpaintdevice_p.h
@@ -81,6 +81,7 @@ public:
     static QGLPaintDevice* getDevice(QPaintDevice*);
 
 protected:
+    int metric(QPaintDevice::PaintDeviceMetric metric) const;
     GLuint m_previousFBO;
     GLuint m_thisFBO;
 };
diff --git a/src/opengl/qgraphicssystem_gl.cpp b/src/opengl/qgraphicssystem_gl.cpp
index a282e4c..58cc28a 100644
--- a/src/opengl/qgraphicssystem_gl.cpp
+++ b/src/opengl/qgraphicssystem_gl.cpp
@@ -40,6 +40,7 @@
 ****************************************************************************/
 
 #include "qgraphicssystem_gl_p.h"
+#include <QGraphicsView>
 
 #include "private/qpixmap_raster_p.h"
 #include "private/qpixmapdata_gl_p.h"
@@ -47,7 +48,7 @@
 #include "private/qgl_p.h"
 #include <private/qwindowsurface_raster_p.h>
 
-#if defined(Q_WS_X11) && defined(QT_OPENGL_ES)
+#if defined(Q_WS_X11) && !defined(QT_NO_EGL)
 #include "private/qpixmapdata_x11gl_p.h"
 #include "private/qwindowsurface_x11gl_p.h"
 #endif
@@ -58,10 +59,6 @@ extern QGLWidget *qt_gl_getShareWidget();
 
 QPixmapData *QGLGraphicsSystem::createPixmapData(QPixmapData::PixelType type) const
 {
-#if defined(Q_WS_X11) && defined(QT_OPENGL_ES)
-    if (type == QPixmapData::PixmapType && QX11GLPixmapData::hasX11GLPixmaps())
-        return new QX11GLPixmapData();
-#endif
     return new QGLPixmapData(type);
 }
 
@@ -75,9 +72,18 @@ QWindowSurface *QGLGraphicsSystem::createWindowSurface(QWidget *widget) const
         return new QRasterWindowSurface(widget);
 #endif
 
-#if defined(Q_WS_X11) && defined(QT_OPENGL_ES)
-    if (QX11GLPixmapData::hasX11GLPixmaps())
-        return new QX11GLWindowSurface(widget);
+#if defined(Q_WS_X11) && !defined(QT_NO_EGL)
+    if (m_useX11GL && QX11GLPixmapData::hasX11GLPixmaps()) {
+        // If the widget is a QGraphicsView which will be re-drawing the entire
+        // scene each frame anyway, we should use QGLWindowSurface as this may
+        // provide proper buffer flipping, which should be faster than QX11GL's
+        // blitting approach:
+        QGraphicsView* qgv = qobject_cast<QGraphicsView*>(widget);
+        if (qgv && qgv->viewportUpdateMode() == QGraphicsView::FullViewportUpdate)
+            return new QGLWindowSurface(widget);
+        else
+            return new QX11GLWindowSurface(widget);
+    }
 #endif
 
     return new QGLWindowSurface(widget);
diff --git a/src/opengl/qgraphicssystem_gl_p.h b/src/opengl/qgraphicssystem_gl_p.h
index ff47854..9d2d506 100644
--- a/src/opengl/qgraphicssystem_gl_p.h
+++ b/src/opengl/qgraphicssystem_gl_p.h
@@ -62,10 +62,12 @@ QT_BEGIN_NAMESPACE
 class Q_OPENGL_EXPORT QGLGraphicsSystem : public QGraphicsSystem
 {
 public:
-    QGLGraphicsSystem();
+    QGLGraphicsSystem(bool useX11GL);
 
     QPixmapData *createPixmapData(QPixmapData::PixelType type) const;
     QWindowSurface *createWindowSurface(QWidget *widget) const;
+private:
+    bool m_useX11GL;
 };
 
 QT_END_NAMESPACE
diff --git a/src/opengl/qpixmapdata_x11gl_egl.cpp b/src/opengl/qpixmapdata_x11gl_egl.cpp
index 3ab385a..2c11a0b 100644
--- a/src/opengl/qpixmapdata_x11gl_egl.cpp
+++ b/src/opengl/qpixmapdata_x11gl_egl.cpp
@@ -62,118 +62,173 @@
 QT_BEGIN_NAMESPACE
 
 
-// On 16bpp systems, RGB & ARGB pixmaps are different bit-depths and therefore need
-// different contexts:
+class QX11GLSharedContexts
+{
+public:
+    QX11GLSharedContexts()
+        : rgbContext(0)
+        , argbContext(0)
+        , sharedQGLContext(0)
+        , sharePixmap(0)
+    {
+        EGLint rgbConfigId;
+        EGLint argbConfigId;
+
+        do {
+            EGLConfig rgbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL, QEgl::Renderable);
+            EGLConfig argbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL,
+                                                       QEgl::Renderable | QEgl::Translucent);
+
+            eglGetConfigAttrib(QEgl::display(), rgbConfig, EGL_CONFIG_ID, &rgbConfigId);
+            eglGetConfigAttrib(QEgl::display(), argbConfig, EGL_CONFIG_ID, &argbConfigId);
+
+            rgbContext = new QEglContext;
+            rgbContext->setConfig(rgbConfig);
+            rgbContext->createContext();
 
-Q_GLOBAL_STATIC(QEglContext, qt_x11gl_rgbContext);
-Q_GLOBAL_STATIC(QEglContext, qt_x11gl_argbContext)
+            if (!rgbContext->isValid())
+                break;
 
-QEglContext* QX11GLPixmapData::rgbContext = 0;
-QEglContext* QX11GLPixmapData::argbContext = 0;
+            // If the RGB & ARGB configs are the same, use the same egl context for both:
+            if (rgbConfig == argbConfig)
+                argbContext = rgbContext;
+
+            // Otherwise, create a seperate context to be used for ARGB pixmaps:
+            if (!argbContext) {
+                argbContext = new QEglContext;
+                argbContext->setConfig(argbConfig);
+                bool success = argbContext->createContext(rgbContext);
+                if (!success) {
+                    qWarning("QX11GLPixmapData - RGB & ARGB contexts aren't shared");
+                    success = argbContext->createContext();
+                    if (!success)
+                        argbContext = rgbContext; // Might work, worth a shot at least.
+                }
+            }
 
+            if (!argbContext->isValid())
+                break;
 
-bool QX11GLPixmapData::hasX11GLPixmaps()
-{
-    static bool checkedForX11Pixmaps = false;
-    static bool haveX11Pixmaps = false;
+            // Create the pixmap which will be used to create the egl surface for the share QGLContext
+            QX11PixmapData *rgbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
+            rgbPixmapData->resize(8, 8);
+            rgbPixmapData->fill(Qt::red);
+            sharePixmap = new QPixmap(rgbPixmapData);
+            EGLSurface sharePixmapSurface = QEgl::createSurface(sharePixmap, rgbConfig);
+            rgbPixmapData->gl_surface = (void*)sharePixmapSurface;
+
+            // Create the actual QGLContext which will be used for sharing
+            sharedQGLContext = new QGLContext(QX11GLPixmapData::glFormat());
+            sharedQGLContext->d_func()->eglContext = rgbContext;
+            sharedQGLContext->d_func()->eglSurface = sharePixmapSurface;
+            sharedQGLContext->d_func()->valid = true;
+            qt_glformat_from_eglconfig(sharedQGLContext->d_func()->glFormat, rgbConfig);
+
+
+            valid = rgbContext->makeCurrent(sharePixmapSurface);
+
+            // If the ARGB & RGB configs are different, check ARGB works too:
+            if (argbConfig != rgbConfig) {
+                QX11PixmapData *argbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
+                argbPixmapData->resize(8, 8);
+                argbPixmapData->fill(Qt::transparent); // Force ARGB
+                QPixmap argbPixmap(argbPixmapData); // destroys pixmap data when goes out of scope
+                EGLSurface argbPixmapSurface = QEgl::createSurface(&argbPixmap, argbConfig);
+                valid = argbContext->makeCurrent(argbPixmapSurface);
+                argbContext->doneCurrent();
+                eglDestroySurface(QEgl::display(), argbPixmapSurface);
+                argbPixmapData->gl_surface = 0;
+            }
 
-    if (checkedForX11Pixmaps)
-        return haveX11Pixmaps;
+            if (!valid) {
+                qWarning() << "Unable to make pixmap surface current:" << QEgl::errorString();
+                break;
+            }
 
-    checkedForX11Pixmaps = true;
+            // The pixmap surface destruction hooks are installed by QGLTextureCache, so we
+            // must make sure this is instanciated:
+            QGLTextureCache::instance();
+        } while(0);
 
-    EGLint rgbConfigId;
-    EGLint argbConfigId;
+        if (!valid)
+            cleanup();
+        else
+            qDebug("Using QX11GLPixmapData with EGL config %d for ARGB and config %d for RGB", argbConfigId, rgbConfigId);
 
-    do {
-        if (qgetenv("QT_USE_X11GL_PIXMAPS").isEmpty())
-            break;
+    }
 
-        EGLConfig rgbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL, QEgl::Renderable);
-        EGLConfig argbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL,
-                                                   QEgl::Renderable | QEgl::Translucent);
+    ~QX11GLSharedContexts() {
+        cleanup();
+    }
 
-        eglGetConfigAttrib(QEgl::display(), rgbConfig, EGL_CONFIG_ID, &rgbConfigId);
-        eglGetConfigAttrib(QEgl::display(), argbConfig, EGL_CONFIG_ID, &argbConfigId);
+    void cleanup() {
+        if (sharedQGLContext) {
+            delete sharedQGLContext;
+            sharedQGLContext = 0;
+        }
+        if (argbContext && argbContext != rgbContext)
+            delete argbContext;
+        argbContext = 0;
 
-        if (!rgbContext) {
-            rgbContext = qt_x11gl_rgbContext();
-            rgbContext->setConfig(rgbConfig);
-            rgbContext->createContext();
+        if (rgbContext) {
+            delete rgbContext;
+            rgbContext = 0;
         }
 
-        if (!rgbContext->isValid())
-            break;
+        // Deleting the QPixmap will fire the pixmap destruction cleanup hooks which in turn
+        // will destroy the egl surface:
+        if (sharePixmap) {
+            delete sharePixmap;
+            sharePixmap = 0;
+        }
+    }
 
-        // If the configs are the same, use the same egl contexts:
-        if (rgbConfig == argbConfig)
-            argbContext = rgbContext;
+    bool isValid() { return valid;}
 
-        if (!argbContext) {
-            argbContext = qt_x11gl_argbContext();
-            argbContext->setConfig(argbConfig);
-            argbContext->createContext();
-        }
+    // On 16bpp systems, RGB & ARGB pixmaps are different bit-depths and therefore need
+    // different contexts:
+    QEglContext *rgbContext;
+    QEglContext *argbContext;
 
-        if (!argbContext->isValid())
-            break;
-
-        {
-            QX11PixmapData *argbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
-            argbPixmapData->resize(100, 100);
-            argbPixmapData->fill(Qt::transparent); // Force ARGB
-            QPixmap argbPixmap(argbPixmapData);
-            EGLSurface argbPixmapSurface = QEgl::createSurface(&argbPixmap, argbConfig);
-            haveX11Pixmaps = argbContext->makeCurrent(argbPixmapSurface);
-            argbContext->doneCurrent();
-            eglDestroySurface(QEgl::display(), argbPixmapSurface);
-        }
+    // The share context wraps the rgbContext and is used as the master of the context share
+    // group. As all other contexts will have the same egl context (or a shared one if rgb != argb)
+    // all QGLContexts will actually be sharing and can be in the same context group.
+    QGLContext  *sharedQGLContext;
+private:
+    QPixmap     *sharePixmap;
+    bool         valid;
+};
 
-        if (!haveX11Pixmaps) {
-            qWarning() << "Unable to make pixmap surface current:" << QEgl::errorString();
-            break;
-        }
+static void qt_cleanup_x11gl_share_contexts();
 
-        // If the ARGB & RGB configs are different, check RGB too:
-        if (argbConfig != rgbConfig) {
-            QX11PixmapData *rgbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
-            rgbPixmapData->resize(100, 100);
-            rgbPixmapData->fill(Qt::red);
+Q_GLOBAL_STATIC_WITH_INITIALIZER(QX11GLSharedContexts, qt_x11gl_share_contexts,
+                                 {
+                                     qAddPostRoutine(qt_cleanup_x11gl_share_contexts);
+                                 })
 
-            QPixmap rgbPixmap(rgbPixmapData);
-            EGLSurface rgbPixmapSurface = QEgl::createSurface(&rgbPixmap, rgbConfig);
-            haveX11Pixmaps = rgbContext->makeCurrent(rgbPixmapSurface);
-            rgbContext->doneCurrent();
-            eglDestroySurface(QEgl::display(), rgbPixmapSurface);
+static void qt_cleanup_x11gl_share_contexts()
+{
+    qt_x11gl_share_contexts()->cleanup();
+}
 
-            if (!haveX11Pixmaps) {
-                qWarning() << "Unable to make pixmap config current:" << QEgl::errorString();
-                break;
-            }
-        }
 
-        // The pixmap surface destruction hooks are installed by QGLTextureCache, so we
-        // must make sure this is instanciated:
-        QGLTextureCache::instance();
-    } while (0);
+QX11GLSharedContexts* QX11GLPixmapData::sharedContexts()
+{
+    return qt_x11gl_share_contexts();
+}
 
-    if (!haveX11Pixmaps) {
-        if (argbContext && (argbContext != rgbContext)) {
-            delete argbContext;
-            argbContext = 0;
-        }
-        if (rgbContext) {
-            delete rgbContext;
-            rgbContext = 0;
-        }
-    }
+bool QX11GLPixmapData::hasX11GLPixmaps()
+{
+    static bool checkedForX11GLPixmaps = false;
+    static bool haveX11GLPixmaps = false;
 
-    if (haveX11Pixmaps)
-        qDebug("Using QX11GLPixmapData with EGL config %d for ARGB and config %d for RGB", argbConfigId, rgbConfigId);
-    else
-        qDebug("QX11GLPixmapData is *NOT* being used");
+    if (checkedForX11GLPixmaps)
+        return haveX11GLPixmaps;
 
-    return haveX11Pixmaps;
+    haveX11GLPixmaps = qt_x11gl_share_contexts()->isValid();
+    checkedForX11GLPixmaps = true;
+
+    return haveX11GLPixmaps;
 }
 
 QX11GLPixmapData::QX11GLPixmapData()
@@ -257,7 +312,15 @@ QPaintEngine* QX11GLPixmapData::paintEngine() const
     if (!ctx) {
         ctx = new QGLContext(glFormat());
         Q_ASSERT(ctx->d_func()->eglContext == 0);
-        ctx->d_func()->eglContext = hasAlphaChannel() ? argbContext : rgbContext;
+        ctx->d_func()->eglContext = hasAlphaChannel() ? sharedContexts()->argbContext : sharedContexts()->rgbContext;
+
+        // While we use a seperate QGLContext for each pixmap, the underlying QEglContext is
+        // the same. So we must use a "fake" QGLContext and fool the texture cache into thinking
+        // each pixmap's QGLContext is sharing with this central one. The only place this is
+        // going to fail is where we the underlying EGL RGB and ARGB contexts aren't sharing.
+        ctx->d_func()->sharing = true;
+        QGLContextGroup::addShare(ctx, sharedContexts()->sharedQGLContext);
+
         // Update the glFormat for the QGLContext:
         qt_glformat_from_eglconfig(ctx->d_func()->glFormat, ctx->d_func()->eglContext->config());
     }
@@ -321,12 +384,6 @@ void QX11GLPixmapData::beginPaint()
     QGLPaintDevice::beginPaint();
 }
 
-void QX11GLPixmapData::endPaint()
-{
-    glFinish();
-    QGLPaintDevice::endPaint();
-}
-
 QGLContext* QX11GLPixmapData::context() const
 {
     return ctx;
diff --git a/src/opengl/qpixmapdata_x11gl_p.h b/src/opengl/qpixmapdata_x11gl_p.h
index 8681336..2d1336b 100644
--- a/src/opengl/qpixmapdata_x11gl_p.h
+++ b/src/opengl/qpixmapdata_x11gl_p.h
@@ -65,6 +65,8 @@
 
 QT_BEGIN_NAMESPACE
 
+class QX11GLSharedContexts;
+
 class QX11GLPixmapData : public QX11PixmapData, public QGLPaintDevice
 {
 public:
@@ -79,17 +81,13 @@ public:
     // Re-implemented from QGLPaintDevice
     QPaintEngine* paintEngine() const; // Also re-implements QX11PixmapData::paintEngine
     void beginPaint();
-    void endPaint();
     QGLContext* context() const;
     QSize size() const;
 
     static bool hasX11GLPixmaps();
     static QGLFormat glFormat();
+    static QX11GLSharedContexts* sharedContexts();
 
-#ifndef QT_NO_EGL
-    static QEglContext* rgbContext;
-    static QEglContext* argbContext;
-#endif
 private:
     mutable QGLContext* ctx;
 };
diff --git a/src/opengl/qwindowsurface_gl.cpp b/src/opengl/qwindowsurface_gl.cpp
index d9417d9..ad7c568 100644
--- a/src/opengl/qwindowsurface_gl.cpp
+++ b/src/opengl/qwindowsurface_gl.cpp
@@ -82,7 +82,7 @@
 #define GLX_SAMPLES_ARB         100001
 #endif
 
-#ifdef QT_OPENGL_ES
+#ifndef QT_NO_EGL
 #include <private/qeglcontext_p.h>
 #endif
 
@@ -94,8 +94,8 @@ QT_BEGIN_NAMESPACE
 #ifdef Q_WS_WIN
 extern Q_GUI_EXPORT bool qt_win_owndc_required;
 #endif
-QGLGraphicsSystem::QGLGraphicsSystem()
-    : QGraphicsSystem()
+QGLGraphicsSystem::QGLGraphicsSystem(bool useX11GL)
+    : QGraphicsSystem(), m_useX11GL(useX11GL)
 {
 #if defined(Q_WS_X11) && !defined(QT_OPENGL_ES)
     // only override the system defaults if the user hasn't already
@@ -353,6 +353,11 @@ void QGLWindowSurface::hijackWindow(QWidget *widget)
     QGLContext *ctx = new QGLContext(surfaceFormat, widget);
     ctx->create(qt_gl_share_widget()->context());
 
+#ifndef QT_NO_EGL
+    if (ctx->d_func()->eglContext->configAttrib(EGL_SWAP_BEHAVIOR) != EGL_BUFFER_PRESERVED)
+        setPartialUpdateSupport(false); // Force full-screen updates
+#endif
+
     widgetPrivate->extraData()->glContext = ctx;
 
     union { QGLContext **ctxPtr; void **voidPtr; };
diff --git a/src/opengl/qwindowsurface_x11gl.cpp b/src/opengl/qwindowsurface_x11gl.cpp
index 7befe03..3de6cae 100644
--- a/src/opengl/qwindowsurface_x11gl.cpp
+++ b/src/opengl/qwindowsurface_x11gl.cpp
@@ -72,63 +72,66 @@ extern void *qt_getClipRects(const QRegion &r, int &num); // in qpaintengine_x11
 
 void QX11GLWindowSurface::flush(QWidget *widget, const QRegion &widgetRegion, const QPoint &offset)
 {
-//    qDebug("QX11GLWindowSurface::flush()");
-    QTime startTime = QTime::currentTime();
+    // We don't need to know the widget which initiated the flush. Instead we just use the offset
+    // to translate the widgetRegion:
+    Q_UNUSED(widget);
+
     if (m_backBuffer.isNull()) {
-        qDebug("QHarmattanWindowSurface::flush() - backBuffer is null, not flushing anything");
+        qDebug("QX11GLWindowSurface::flush() - backBuffer is null, not flushing anything");
         return;
     }
 
-    QPoint widgetOffset = qt_qwidget_data(widget)->wrect.topLeft();
-    QRegion windowRegion(widgetRegion);
-    QRect boundingRect = widgetRegion.boundingRect();
-    if (!widgetOffset.isNull())
-        windowRegion.translate(-widgetOffset);
-    QRect windowBoundingRect = windowRegion.boundingRect();
+    Q_ASSERT(window()->size() != m_backBuffer.size());
 
-    int rectCount;
-    XRectangle *rects = (XRectangle *)qt_getClipRects(windowRegion, rectCount);
-    if (rectCount <= 0)
-        return;
-//         qDebug() << "XSetClipRectangles";
-//         for  (int i = 0; i < num; ++i)
-//             qDebug() << ' ' << i << rects[i].x << rects[i].x << rects[i].y << rects[i].width << rects[i].height;
+    // Wait for all GL rendering to the back buffer pixmap to complete before trying to
+    // copy it to the window. We do this by making sure the pixmap's context is current
+    // and then call eglWaitClient. The EGL 1.4 spec says eglWaitClient doesn't have to
+    // block, just that "All rendering calls...are guaranteed to be executed before native
+    // rendering calls". This makes it potentially less expensive than glFinish.
+    QGLContext* ctx = static_cast<QX11GLPixmapData*>(m_backBuffer.data_ptr().data())->context();
+    if (QGLContext::currentContext() != ctx && ctx && ctx->isValid())
+        ctx->makeCurrent();
+    eglWaitClient();
 
     if (m_windowGC == 0) {
-        m_windowGC = XCreateGC(X11->display, m_window->handle(), 0, 0);
-        XSetGraphicsExposures(X11->display, m_windowGC, False);
+        XGCValues attribs;
+        attribs.graphics_exposures = False;
+        m_windowGC = XCreateGC(X11->display, m_window->handle(), GCGraphicsExposures, &attribs);
     }
 
+    int rectCount;
+    XRectangle *rects = (XRectangle *)qt_getClipRects(widgetRegion, rectCount);
+    if (rectCount <= 0)
+        return;
+
     XSetClipRectangles(X11->display, m_windowGC, 0, 0, rects, rectCount, YXBanded);
+
+    QRect dirtyRect = widgetRegion.boundingRect().translated(-offset);
     XCopyArea(X11->display, m_backBuffer.handle(), m_window->handle(), m_windowGC,
-              boundingRect.x() + offset.x(), boundingRect.y() + offset.y(),
-              boundingRect.width(), boundingRect.height(),
-              windowBoundingRect.x(), windowBoundingRect.y());
-
-    QX11GLPixmapData* pmd = static_cast<QX11GLPixmapData*>(m_backBuffer.data_ptr().data());
-    Q_ASSERT(pmd->context());
-    pmd->context()->makeCurrent();
-    XSync(X11->display, False);
+              dirtyRect.x(), dirtyRect.y(), dirtyRect.width(), dirtyRect.height(),
+              dirtyRect.x(), dirtyRect.y());
+
+    // Make sure the blit of the update from the back buffer to the window completes
+    // before allowing rendering to start again to the back buffer. Otherwise the GPU
+    // might start rendering to the back buffer again while the blit takes place.
     eglWaitNative(EGL_CORE_NATIVE_ENGINE);
 }
 
 void QX11GLWindowSurface::setGeometry(const QRect &rect)
 {
     if (rect.width() > m_backBuffer.size().width() || rect.height() > m_backBuffer.size().height()) {
-        QSize newSize = rect.size();
-//        QSize newSize(1024,512);
-        qDebug() << "QX11GLWindowSurface::setGeometry() - creating a pixmap of size" << newSize;
         QX11GLPixmapData *pd = new QX11GLPixmapData;
+        QSize newSize = rect.size();
         pd->resize(newSize.width(), newSize.height());
         m_backBuffer = QPixmap(pd);
         if (window()->testAttribute(Qt::WA_TranslucentBackground))
             m_backBuffer.fill(Qt::transparent);
+        if (m_pixmapGC) {
+            XFreeGC(X11->display, m_pixmapGC);
+            m_pixmapGC = 0;
+        }
     }
 
-//    if (gc)
-//        XFreeGC(X11->display, gc);
-//    gc = XCreateGC(X11->display, d_ptr->device.handle(), 0, 0);
-//    XSetGraphicsExposures(X11->display, gc, False);
     QWindowSurface::setGeometry(rect);
 }
 
@@ -139,10 +142,10 @@ bool QX11GLWindowSurface::scroll(const QRegion &area, int dx, int dy)
 
     Q_ASSERT(m_backBuffer.data_ptr()->classId() == QPixmapData::X11Class);
 
-    QX11GLPixmapData* pmd = static_cast<QX11GLPixmapData*>(m_backBuffer.data_ptr().data());
-    Q_ASSERT(pmd->context());
-    pmd->context()->makeCurrent();
-    glFinish();
+    // Make sure all GL rendering is complete before starting the scroll operation:
+    QGLContext* ctx = static_cast<QX11GLPixmapData*>(m_backBuffer.data_ptr().data())->context();
+    if (QGLContext::currentContext() != ctx && ctx && ctx->isValid())
+        ctx->makeCurrent();
     eglWaitClient();
 
     if (!m_pixmapGC)
@@ -154,24 +157,57 @@ bool QX11GLWindowSurface::scroll(const QRegion &area, int dx, int dy)
                   rect.x()+dx, rect.y()+dy);
     }
 
-    XSync(X11->display, False);
+    // Make sure the scroll operation is complete before allowing GL rendering to resume
     eglWaitNative(EGL_CORE_NATIVE_ENGINE);
 
     return true;
 }
 
-/*
-void QX11GLWindowSurface::beginPaint(const QRegion &region)
-{
-}
 
-void QX11GLWindowSurface::endPaint(const QRegion &region)
+QPixmap QX11GLWindowSurface::grabWidget(const QWidget *widget, const QRect& rect) const
 {
-}
+    if (!widget || m_backBuffer.isNull())
+        return QPixmap();
 
-QImage *QX11GLWindowSurface::buffer(const QWidget *widget)
-{
+    QRect srcRect;
+
+    // make sure the rect is inside the widget & clip to widget's rect
+    if (!rect.isEmpty())
+        srcRect = rect & widget->rect();
+    else
+        srcRect = widget->rect();
+
+    if (srcRect.isEmpty())
+        return QPixmap();
+
+    // If it's a child widget we have to translate the coordinates
+    if (widget != window())
+        srcRect.translate(widget->mapTo(window(), QPoint(0, 0)));
+
+    QPixmap::x11SetDefaultScreen(widget->x11Info().screen());
+
+    QX11PixmapData *pmd = new QX11PixmapData(QPixmapData::PixmapType);
+    pmd->resize(srcRect.width(), srcRect.height());
+    QPixmap px(pmd);
+
+    GC tmpGc = XCreateGC(X11->display, m_backBuffer.handle(), 0, 0);
+
+    // Make sure all GL rendering is complete before copying the window
+    QGLContext* ctx = static_cast<QX11GLPixmapData*>(m_backBuffer.pixmapData())->context();
+    if (QGLContext::currentContext() != ctx && ctx && ctx->isValid())
+        ctx->makeCurrent();
+    eglWaitClient();
+
+    // Copy srcRect from the backing store to the new pixmap
+    XSetGraphicsExposures(X11->display, tmpGc, False);
+    XCopyArea(X11->display, m_backBuffer.handle(), px.handle(), tmpGc,
+              srcRect.x(), srcRect.y(), srcRect.width(), srcRect.height(), 0, 0);
+    XFreeGC(X11->display, tmpGc);
+
+    // Wait until the copy has finised before allowing more rendering into the back buffer
+    eglWaitNative(EGL_CORE_NATIVE_ENGINE);
+
+    return px;
 }
-*/
 
 QT_END_NAMESPACE
diff --git a/src/opengl/qwindowsurface_x11gl_p.h b/src/opengl/qwindowsurface_x11gl_p.h
index 3a952e8..4d493d0 100644
--- a/src/opengl/qwindowsurface_x11gl_p.h
+++ b/src/opengl/qwindowsurface_x11gl_p.h
@@ -68,6 +68,7 @@ public:
     void flush(QWidget *widget, const QRegion &region, const QPoint &offset);
     void setGeometry(const QRect &rect);
     bool scroll(const QRegion &area, int dx, int dy);
+    QPixmap grabWidget(const QWidget *widget, const QRect& rectangle = QRect()) const;
 
 private:
     GC      m_windowGC;