Get rid of OpenGL 1.x engine and platform code from QtOpenGL.

Change-Id: I646b8e26d5e7214432a044866764d57cc11b2390
Reviewed-on: http://codereview.qt.nokia.com/3006
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>

1 files changed, 0 insertions, 5635 deletions

diff --git a/src/opengl/qpaintengine_opengl.cpp b/src/opengl/qpaintengine_opengl.cpp
deleted file mode 100644
index 3c35c0334c..0000000000
--- a/src/opengl/qpaintengine_opengl.cpp
+++ /dev/null
@@ -1,5635 +0,0 @@
-/****************************************************************************
-**
-** 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 QtOpenGL module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** GNU Lesser General Public License Usage
-** 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.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU General
-** Public License version 3.0 as published by the Free Software Foundation
-** and appearing in the file LICENSE.GPL included in the packaging of this
-** file. Please review the following information to ensure the GNU General
-** Public License version 3.0 requirements will be met:
-** http://www.gnu.org/copyleft/gpl.html.
-**
-** Other Usage
-** Alternatively, this file may be used in accordance with the terms and
-** conditions contained in a signed written agreement between you and Nokia.
-**
-**
-**
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include <qdebug.h>
-#include <private/qfontengine_p.h>
-#include <qmath.h>
-#include <private/qmath_p.h>
-#include <private/qdrawhelper_p.h>
-#include <private/qpaintengine_p.h>
-#include "qapplication.h"
-#include "qbrush.h"
-#include "qgl.h"
-#include <private/qgl_p.h>
-#include <private/qglpaintdevice_p.h>
-#include <private/qpainter_p.h>
-#include "qmap.h"
-#include <private/qpaintengine_opengl_p.h>
-#include <private/qdatabuffer_p.h>
-#include "qpen.h"
-#include "qvarlengtharray.h"
-#include <private/qpainter_p.h>
-#include <private/qglpixelbuffer_p.h>
-#include <private/qbezier_p.h>
-#include <qglframebufferobject.h>
-#include <private/qstatictext_p.h>
-
-#include "private/qtessellator_p.h"
-
-#include "util/fragmentprograms_p.h"
-
-#ifdef Q_WS_QWS
-#include "private/qglwindowsurface_qws_p.h"
-#include "qwsmanager_qws.h"
-#include "private/qwsmanager_p.h"
-#endif
-
-#define QGL_FUNC_CONTEXT QGLContext *ctx = const_cast<QGLContext *>(device->context());
-
-#include <stdlib.h>
-#include "qpaintengine_opengl_p.h"
-
-QT_BEGIN_NAMESPACE
-
-Q_GUI_EXPORT QImage qt_imageForBrush(int brushStyle, bool invert); //in qbrush.cpp
-#ifdef QT_MAC_USE_COCOA
-extern void *qt_current_nsopengl_context(); // qgl_mac.mm
-#endif
-
-#define QREAL_MAX 9e100
-#define QREAL_MIN -9e100
-
-extern int qt_next_power_of_two(int v);
-
-#define DISABLE_DEBUG_ONCE
-
-//#define DEBUG_DISPLAY_MASK_TEXTURE
-
-#ifdef DISABLE_DEBUG_ONCE
-#define DEBUG_OVERRIDE(state) ;
-#define DEBUG_ONCE_STR(str) ;
-#define DEBUG_ONCE if (0)
-#else
-static int DEBUG_OVERRIDE_FLAG = 0;
-static bool DEBUG_TEMP_FLAG;
-#define DEBUG_OVERRIDE(state) { state ? ++DEBUG_OVERRIDE_FLAG : --DEBUG_OVERRIDE_FLAG; }
-#define DEBUG_ONCE if ((DEBUG_TEMP_FLAG = DEBUG_OVERRIDE_FLAG) && 0) ; else for (static int DEBUG_ONCE_FLAG = false; !DEBUG_ONCE_FLAG || DEBUG_TEMP_FLAG; DEBUG_ONCE_FLAG = true, DEBUG_TEMP_FLAG = false)
-#define DEBUG_ONCE_STR(str) DEBUG_ONCE qDebug() << (str);
-#endif
-
-#ifdef Q_WS_X11
-static bool qt_nvidiaFboNeedsFinish = false;
-#endif
-
-static inline void qt_glColor4ubv(unsigned char *col)
-{
-    glColor4f(col[0]/255.0f, col[1]/255.0f, col[2]/255.0f, col[3]/255.0f);
-}
-
-struct QT_PointF {
-    qreal x;
-    qreal y;
-};
-
-struct QGLTrapezoid
-{
-    QGLTrapezoid()
-    {}
-
-    QGLTrapezoid(qreal top_, qreal bottom_, qreal topLeftX_, qreal topRightX_, qreal bottomLeftX_, qreal bottomRightX_)
-        : top(top_),
-          bottom(bottom_),
-          topLeftX(topLeftX_),
-          topRightX(topRightX_),
-          bottomLeftX(bottomLeftX_),
-          bottomRightX(bottomRightX_)
-    {}
-
-    const QGLTrapezoid translated(const QPointF &delta) const;
-
-    qreal top;
-    qreal bottom;
-    qreal topLeftX;
-    qreal topRightX;
-    qreal bottomLeftX;
-    qreal bottomRightX;
-};
-
-const QGLTrapezoid QGLTrapezoid::translated(const QPointF &delta) const
-{
-    QGLTrapezoid trap(*this);
-    trap.top += delta.y();
-    trap.bottom += delta.y();
-    trap.topLeftX += delta.x();
-    trap.topRightX += delta.x();
-    trap.bottomLeftX += delta.x();
-    trap.bottomRightX += delta.x();
-    return trap;
-}
-
-
-class QOpenGLImmediateModeTessellator;
-class QGLMaskGenerator;
-class QGLOffscreen;
-
-class QGLMaskTextureCache
-{
-public:
-    void setOffscreenSize(const QSize &offscreenSize);
-    void setDrawableSize(const QSize &drawableSize);
-
-    struct CacheLocation {
-        QRect rect;
-        int channel;
-
-        QRect screen_rect;
-    };
-
-    struct CacheInfo {
-        inline CacheInfo(const QPainterPath &p, const QTransform &m, qreal w = -1) :
-            path(p), matrix(m), stroke_width(w), age(0) {}
-
-        QPainterPath path;
-        QTransform matrix;
-        qreal stroke_width;
-
-        CacheLocation loc;
-
-        int age;
-    };
-
-    struct QuadTreeNode {
-        quint64 key;
-
-        int largest_available_block;
-        int largest_used_block;
-    };
-
-    CacheLocation getMask(QGLMaskGenerator &maskGenerator, QOpenGLPaintEnginePrivate *engine);
-
-    typedef QMultiHash<quint64, CacheInfo> QGLTextureCacheHash;
-
-    enum {block_size = 64};
-
-    // throw out keys that are too old
-    void maintainCache();
-    void clearCache();
-
-private:
-    quint64 hash(const QPainterPath &p, const QTransform &m, qreal w);
-
-    void createMask(quint64 key, CacheInfo &info, QGLMaskGenerator &maskGenerator);
-
-    QSize offscreenSize;
-    QSize drawableSize;
-
-    QGLTextureCacheHash cache;
-
-    QVector<QuadTreeNode> occupied_quadtree[4];
-
-    void quadtreeUpdate(int channel, int node, int current_block_size);
-    void quadtreeAllocate(quint64 key, const QSize &size, QRect *rect, int *channel);
-
-    bool quadtreeFindAvailableLocation(const QSize &size, QRect *rect, int *channel);
-    void quadtreeFindExistingLocation(const QSize &size, QRect *rect, int *channel);
-
-    void quadtreeInsert(int channel, quint64 key, const QRect &rect, int node = 0);
-    void quadtreeClear(int channel, const QRect &rect, int node = 0);
-
-    int quadtreeBlocksize(int node);
-    QPoint quadtreeLocation(int node);
-
-    QOpenGLPaintEnginePrivate *engine;
-};
-
-Q_GLOBAL_STATIC(QGLMaskTextureCache, qt_mask_texture_cache)
-
-class QGLOffscreen : public QObject
-{
-    Q_OBJECT
-public:
-    QGLOffscreen()
-        : QObject(),
-          offscreen(0),
-          ctx(0),
-          mask_dim(0),
-          activated(false),
-          bound(false)
-    {
-        connect(QGLSignalProxy::instance(),
-                SIGNAL(aboutToDestroyContext(const QGLContext*)),
-                SLOT(cleanupGLContextRefs(const QGLContext*)));
-    }
-
-    inline void setDevice(QPaintDevice *pdev);
-
-    void begin();
-    void end();
-
-    inline void bind();
-    inline void release();
-
-    inline bool isBound() const;
-
-    inline QSize drawableSize() const;
-    inline QSize offscreenSize() const;
-
-    inline GLuint offscreenTexture() const;
-
-    QGLContext *context() const;
-
-    static bool isSupported();
-
-    inline void initialize();
-
-    inline bool isValid() const;
-
-public Q_SLOTS:
-    void cleanupGLContextRefs(const QGLContext *context) {
-        if (context == ctx) {
-            delete offscreen;
-            ctx = 0;
-            offscreen = 0;
-            mask_dim = 0;
-        }
-    }
-
-private:
-    QGLPaintDevice* device;
-
-    QGLFramebufferObject *offscreen;
-    QGLContext *ctx;
-
-    // dimensions of mask texture (square)
-    int mask_dim;
-    QSize last_failed_size;
-
-    bool drawable_fbo;
-
-    bool activated;
-    bool initialized;
-
-    bool bound;
-};
-
-inline void QGLOffscreen::setDevice(QPaintDevice *pdev)
-{
-    if (pdev->devType() == QInternal::OpenGL)
-        device = static_cast<QGLPaintDevice*>(pdev);
-    else
-        device = QGLPaintDevice::getDevice(pdev);
-
-    if (!device)
-        return;
-
-    drawable_fbo = (pdev->devType() == QInternal::FramebufferObject);
-}
-
-void QGLOffscreen::begin()
-{
-#ifndef QT_OPENGL_ES
-    initialized = false;
-
-    if (activated)
-        initialize();
-#endif
-}
-
-void QGLOffscreen::initialize()
-{
-#ifndef QT_OPENGL_ES
-    if (initialized)
-        return;
-
-    activated = true;
-    initialized = true;
-
-    int dim = qMax(2048, static_cast<int>(qt_next_power_of_two(qMax(device->size().width(), device->size().height()))));
-
-    bool shared_context = QGLContext::areSharing(device->context(), ctx);
-    bool would_fail = last_failed_size.isValid() &&
-                      (device->size().width() >= last_failed_size.width() ||
-                       device->size().height() >= last_failed_size.height());
-    bool needs_refresh = dim > mask_dim || !shared_context;
-
-    if (needs_refresh && !would_fail) {
-        DEBUG_ONCE qDebug() << "QGLOffscreen::initialize(): creating offscreen of size" << dim;
-        delete offscreen;
-        offscreen = new QGLFramebufferObject(dim, dim, GLenum(GL_TEXTURE_2D));
-        mask_dim = dim;
-
-        if (!offscreen->isValid()) {
-            qWarning("QGLOffscreen: Invalid offscreen fbo (size %dx%d)", mask_dim, mask_dim);
-            delete offscreen;
-            offscreen = 0;
-            mask_dim = 0;
-            last_failed_size = device->size();
-        }
-    }
-
-    qt_mask_texture_cache()->setOffscreenSize(offscreenSize());
-    qt_mask_texture_cache()->setDrawableSize(device->size());
-    ctx = device->context();
-#endif
-}
-
-inline bool QGLOffscreen::isValid() const
-{
-    return offscreen;
-}
-
-void QGLOffscreen::end()
-{
-    if (bound)
-        release();
-#ifdef DEBUG_DISPLAY_MASK_TEXTURE
-    glReadBuffer(GL_BACK);
-    glDrawBuffer(GL_BACK);
-    glMatrixMode(GL_MODELVIEW);
-    glLoadIdentity();
-    glColor4f(1, 1, 1, 1);
-    glDisable(GL_DEPTH_TEST);
-    glBlendFunc(GL_ONE, GL_ZERO);
-    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-    glEnable(GL_TEXTURE_2D);
-    glBindTexture(GL_TEXTURE_2D, offscreen->texture());
-
-    glBegin(GL_QUADS);
-    glTexCoord2f(0.0, 1.0); glVertex2f(0.0, 0.0);
-    glTexCoord2f(1.0, 1.0); glVertex2f(drawable.size().width(), 0.0);
-    glTexCoord2f(1.0, 0.0); glVertex2f(drawable.size().width(), drawable.size().height());
-    glTexCoord2f(0.0, 0.0); glVertex2f(0.0, drawable.size().height());
-    glEnd();
-
-    glBindTexture(GL_TEXTURE_2D, 0);
-    glDisable(GL_TEXTURE_2D);
-#endif
-}
-
-inline void QGLOffscreen::bind()
-{
-#ifndef QT_OPENGL_ES
-    Q_ASSERT(initialized);
-
-    if (!offscreen || bound)
-        return;
-
-    DEBUG_ONCE qDebug() << "QGLOffscreen: binding offscreen";
-    offscreen->bind();
-
-    bound = true;
-
-    glViewport(0, 0, offscreenSize().width(), offscreenSize().height());
-
-    glMatrixMode(GL_PROJECTION);
-    glLoadIdentity();
-    glOrtho(0, offscreenSize().width(), offscreenSize().height(), 0, -999999, 999999);
-    glMatrixMode(GL_MODELVIEW);
-#endif
-}
-
-inline void QGLOffscreen::release()
-{
-#ifndef QT_OPENGL_ES
-    if (!offscreen || !bound)
-        return;
-
-#ifdef Q_WS_X11
-    // workaround for bug in nvidia driver versions 9x.xx
-    if (qt_nvidiaFboNeedsFinish)
-        glFinish();
-#endif
-
-    DEBUG_ONCE_STR("QGLOffscreen: releasing offscreen");
-
-    if (drawable_fbo)
-        device->ensureActiveTarget(); //###
-    else
-        offscreen->release();
-
-    QSize sz(device->size());
-    glViewport(0, 0, sz.width(), sz.height());
-
-    glMatrixMode(GL_PROJECTION);
-    glLoadIdentity();
-#ifndef QT_OPENGL_ES
-    glOrtho(0, sz.width(), sz.height(), 0, -999999, 999999);
-#else
-    glOrthof(0, sz.width(), sz.height(), 0, -999999, 999999);
-#endif
-    glMatrixMode(GL_MODELVIEW);
-
-    bound = false;
-#endif
-}
-
-inline bool QGLOffscreen::isBound() const
-{
-    return bound;
-}
-
-inline QSize QGLOffscreen::drawableSize() const
-{
-    return device->size();
-}
-
-inline QSize QGLOffscreen::offscreenSize() const
-{
-    return QSize(mask_dim, mask_dim);
-}
-
-inline GLuint QGLOffscreen::offscreenTexture() const
-{
-    return offscreen ? offscreen->texture() : 0;
-}
-
-inline QGLContext *QGLOffscreen::context() const
-{
-    return ctx;
-}
-
-bool QGLOffscreen::isSupported()
-{
-    return (QGLExtensions::glExtensions() & QGLExtensions::FramebufferObject); // for fbo
-}
-
-struct QDrawQueueItem
-{
-    QDrawQueueItem(qreal _opacity,
-                   QBrush _brush,
-                   const QPointF &_brush_origion,
-                   QPainter::CompositionMode _composition_mode,
-                   const QTransform &_matrix,
-                   QGLMaskTextureCache::CacheLocation _location)
-        : opacity(_opacity),
-          brush(_brush),
-          brush_origin(_brush_origion),
-          composition_mode(_composition_mode),
-          matrix(_matrix),
-          location(_location) {}
-    qreal opacity;
-    QBrush brush;
-    QPointF brush_origin;
-    QPainter::CompositionMode composition_mode;
-
-    QTransform matrix;
-    QGLMaskTextureCache::CacheLocation location;
-};
-
-////////// GL program cache: start
-
-struct GLProgram {
-    int brush; // brush index or mask index
-    int mode;  // composition mode index
-    bool mask;
-    GLuint program;
-};
-
-typedef QMultiHash<const QGLContext *, GLProgram> QGLProgramHash;
-
-class QGLProgramCache : public QObject
-{
-    Q_OBJECT
-public:
-    QGLProgramCache() {
-        // we have to know when a context is deleted so we can free
-        // any program handles it holds
-        connect(QGLSignalProxy::instance(), SIGNAL(aboutToDestroyContext(const QGLContext*)),
-                SLOT(cleanupPrograms(const QGLContext*)));
-
-    }
-    ~QGLProgramCache() {
-        // at this point the cache should contain 0 elements
-        // Q_ASSERT(program.size() == 0);
-    }
-
-    GLuint getProgram(const QGLContext *ctx, int brush, int mode, bool mask_mode)
-    {
-        // 1. see if we have an entry for the ctx context
-        QList<GLProgram> progs = programs.values(ctx);
-        for (int i=0; i<progs.size(); ++i) {
-            const GLProgram &prg = progs.at(i);
-            if (mask_mode) {
-                if (prg.mask && prg.brush == brush)
-                    return prg.program;
-            } else {
-                if (!prg.mask && prg.brush == brush && prg.mode == mode)
-                    return prg.program;
-            }
-        }
-
-        // 2. try to find a match in a shared context, and update the
-        // hash with the entry found
-        QList<const QGLContext *> contexts = programs.uniqueKeys();
-        for (int i=0; i<contexts.size(); ++i) {
-            const QGLContext *cx = contexts.at(i);
-            if (cx != ctx && QGLContext::areSharing(cx, ctx)) {
-                QList<GLProgram> progs = programs.values(cx);
-                for (int k=0; k<progs.size(); ++k) {
-                    const GLProgram &prg = progs.at(k);
-                    if (mask_mode) {
-                        if (prg.mask && prg.brush == brush) {
-                            programs.insert(ctx, prg);
-                            return prg.program;
-                        }
-                    } else {
-                        if (!prg.mask && prg.brush == brush && prg.mode == mode) {
-                            programs.insert(ctx, prg);
-                            return prg.program;
-                        }
-                    }
-                }
-            }
-        }
-
-        // 3. compile a new program and place it into the cache
-        // NB! assumes ctx is the current GL context
-        GLProgram prg;
-        prg.brush = brush;
-        prg.mode = mode;
-        prg.mask = mask_mode;
-        glGenProgramsARB(1, &prg.program);
-        glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prg.program);
-        const char *src = mask_mode
-                          ? mask_fragment_program_sources[brush]
-                          : painter_fragment_program_sources[brush][mode];
-        // necessary for .NET 2002, apparently
-        const GLbyte *gl_src = reinterpret_cast<const GLbyte *>(src);
-
-        while (glGetError() != GL_NO_ERROR) {} // reset error state
-        glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
-                           int(strlen(src)), gl_src);
-        if (glGetError() != GL_NO_ERROR) {
-//            qDebug() << "QGLProgramCache: Unable to compile fragment program.";
-            glDeleteProgramsARB(1, &prg.program);
-            return 0;
-        }
-
-//        qDebug() << "QGLProgramCache: Creating GL program:" << prg.program << hex << ctx;
-        programs.insert(ctx, prg);
-        return prg.program;
-    }
-
-public Q_SLOTS:
-    void cleanupPrograms(const QGLContext *context)
-    {
-        QGLProgramHash::iterator it = programs.begin();
-        while (it != programs.end()) {
-            if (it.key() == context) {
-                if (!context->isSharing()) {
-                    // the ctx variable below is needed for the glDeleteProgramARB call
-                    // since it is resolved from our extension system
-                    // NB! assumes context is the current GL context
-                    const QGLContext *ctx = context;
-                    // qDebug() << "QGLProgramHash: Deleting GL program:" << it.value().program << hex << it.key();
-                    glDeleteProgramsARB(1, &it.value().program);
-                }
-                it = programs.erase(it);
-            } else {
-                ++it;
-            }
-        }
-    }
-
-private:
-    QGLProgramHash programs;
-};
-
-Q_GLOBAL_STATIC(QGLProgramCache, qt_gl_program_cache)
-
-////////// GL program cache: end
-
-class QOpenGLPaintEnginePrivate;
-class QGLPrivateCleanup : public QObject
-{
-    Q_OBJECT
-public:
-    QGLPrivateCleanup(QOpenGLPaintEnginePrivate *priv)
-        : p(priv)
-    {
-        connect(QGLSignalProxy::instance(),
-                SIGNAL(aboutToDestroyContext(const QGLContext*)),
-                SLOT(cleanupGLContextRefs(const QGLContext*)));
-    }
-
-public Q_SLOTS:
-    void cleanupGLContextRefs(const QGLContext *context);
-
-private:
-    QOpenGLPaintEnginePrivate *p;
-};
-
-class QOpenGLPaintEnginePrivate : public QPaintEngineExPrivate
-{
-    Q_DECLARE_PUBLIC(QOpenGLPaintEngine)
-public:
-    QOpenGLPaintEnginePrivate()
-        : opacity(1)
-        , composition_mode(QPainter::CompositionMode_SourceOver)
-        , has_fast_pen(false)
-        , use_stencil_method(false)
-        , dirty_drawable_texture(false)
-        , has_stencil_face_ext(false)
-        , use_fragment_programs(false)
-        , high_quality_antialiasing(false)
-        , use_smooth_pixmap_transform(false)
-        , use_emulation(false)
-        , txop(QTransform::TxNone)
-        , inverseScale(1)
-        , moveToCount(0)
-        , last_created_state(0)
-        , shader_ctx(0)
-        , grad_palette(0)
-        , tess_points(0)
-        , drawable_texture(0)
-        , ref_cleaner(this)
-        {}
-
-    inline void setGLPen(const QColor &c) {
-        uint alpha = qRound(c.alpha() * opacity);
-        pen_color[0] = qt_div_255(c.red() * alpha);
-        pen_color[1] = qt_div_255(c.green() * alpha);
-        pen_color[2] = qt_div_255(c.blue() * alpha);
-        pen_color[3] = alpha;
-    }
-
-    inline void setGLBrush(const QColor &c) {
-        uint alpha = qRound(c.alpha() * opacity);
-        brush_color[0] = qt_div_255(c.red() * alpha);
-        brush_color[1] = qt_div_255(c.green() * alpha);
-        brush_color[2] = qt_div_255(c.blue() * alpha);
-        brush_color[3] = alpha;
-    }
-
-    inline void setGradientOps(const QBrush &brush, const QRectF &bounds);
-    void createGradientPaletteTexture(const QGradient& g);
-
-    void updateGradient(const QBrush &brush, const QRectF &bounds);
-
-    inline void lineToStencil(qreal x, qreal y);
-    inline void curveToStencil(const QPointF &cp1, const QPointF &cp2, const QPointF &ep);
-    void pathToVertexArrays(const QPainterPath &path);
-    void fillVertexArray(Qt::FillRule fillRule);
-    void drawVertexArrays();
-    void fillPath(const QPainterPath &path);
-    void fillPolygon_dev(const QPointF *polygonPoints, int pointCount,
-                         Qt::FillRule fill);
-
-    void drawFastRect(const QRectF &rect);
-    void strokePath(const QPainterPath &path, bool use_cache);
-    void strokePathFastPen(const QPainterPath &path, bool needsResolving);
-    void strokeLines(const QPainterPath &path);
-
-    void updateDepthClip();
-    void systemStateChanged();
-
-    void cleanupGLContextRefs(const QGLContext *context) {
-        if (context == shader_ctx)
-            shader_ctx = 0;
-    }
-
-    inline void updateFastPen() {
-        qreal pen_width = cpen.widthF();
-        has_fast_pen =
-            ((pen_width == 0 || (pen_width <= 1 && matrix.type() <= QTransform::TxTranslate))
-             || cpen.isCosmetic())
-            && cpen.style() == Qt::SolidLine
-            && cpen.isSolid();
-
-    }
-
-    void disableClipping();
-    void enableClipping();
-    void ensureDrawableTexture();
-
-    QPen cpen;
-    QBrush cbrush;
-    Qt::BrushStyle brush_style;
-    QPointF brush_origin;
-    Qt::BrushStyle pen_brush_style;
-    qreal opacity;
-    QPainter::CompositionMode composition_mode;
-
-    Qt::BrushStyle current_style;
-
-    uint has_pen : 1;
-    uint has_brush : 1;
-    uint has_fast_pen : 1;
-    uint use_stencil_method : 1;
-    uint dirty_drawable_texture : 1;
-    uint has_stencil_face_ext : 1;
-    uint use_fragment_programs : 1;
-    uint high_quality_antialiasing : 1;
-    uint has_antialiasing : 1;
-    uint has_fast_composition_mode : 1;
-    uint use_smooth_pixmap_transform : 1;
-    uint use_system_clip : 1;
-    uint use_emulation : 1;
-
-    QRegion dirty_stencil;
-
-    void updateUseEmulation();
-
-    QTransform matrix;
-    GLubyte pen_color[4];
-    GLubyte brush_color[4];
-    QTransform::TransformationType txop;
-    QGLPaintDevice* device;
-    QGLOffscreen offscreen;
-
-    qreal inverseScale;
-
-    int moveToCount;
-    QPointF path_start;
-
-    bool isFastRect(const QRectF &r);
-
-    void drawImageAsPath(const QRectF &r, const QImage &img, const QRectF &sr);
-    void drawTiledImageAsPath(const QRectF &r, const QImage &img, qreal sx, qreal sy, const QPointF &offset);
-
-    void drawOffscreenPath(const QPainterPath &path);
-
-    void composite(const QRectF &rect, const QPoint &maskOffset = QPoint());
-    void composite(GLuint primitive, const GLfloat *vertexArray, int vertexCount, const QPoint &maskOffset = QPoint());
-
-    bool createFragmentPrograms();
-    void deleteFragmentPrograms();
-    void updateFragmentProgramData(int locations[]);
-
-    void cacheItemErased(int channel, const QRect &rect);
-
-    void addItem(const QGLMaskTextureCache::CacheLocation &location);
-    void drawItem(const QDrawQueueItem &item);
-    void flushDrawQueue();
-
-    void copyDrawable(const QRectF &rect);
-
-    void updateGLMatrix() const;
-
-    mutable QPainterState *last_created_state;
-
-    QGLContext *shader_ctx;
-    GLuint grad_palette;
-
-    GLuint painter_fragment_programs[num_fragment_brushes][num_fragment_composition_modes];
-    GLuint mask_fragment_programs[num_fragment_masks];
-
-    float inv_matrix_data[3][4];
-    float fmp_data[4];
-    float fmp2_m_radius2_data[4];
-    float angle_data[4];
-    float linear_data[4];
-
-    float porterduff_ab_data[4];
-    float porterduff_xyz_data[4];
-
-    float mask_offset_data[4];
-    float mask_channel_data[4];
-
-    FragmentBrushType fragment_brush;
-    FragmentCompositionModeType fragment_composition_mode;
-
-    void setPorterDuffData(float a, float b, float x, float y, float z);
-    void setInvMatrixData(const QTransform &inv_matrix);
-
-    qreal max_x;
-    qreal max_y;
-    qreal min_x;
-    qreal min_y;
-
-    QDataBuffer<QPointF> tess_points;
-    QVector<int> tess_points_stops;
-
-    GLdouble projection_matrix[4][4];
-
-#if defined(QT_OPENGL_ES_1) || defined(QT_OPENGL_ES_2)
-    GLfloat mv_matrix[4][4];
-#else
-    GLdouble mv_matrix[4][4];
-#endif
-
-    QList<QDrawQueueItem> drawQueue;
-
-    GLuint drawable_texture;
-    QSize drawable_texture_size;
-
-    int max_texture_size;
-
-    QGLPrivateCleanup ref_cleaner;
-    friend class QGLMaskTextureCache;
-};
-
-class QOpenGLCoordinateOffset
-{
-public:
-    QOpenGLCoordinateOffset(QOpenGLPaintEnginePrivate *d);
-    ~QOpenGLCoordinateOffset();
-
-    static void enableOffset(QOpenGLPaintEnginePrivate *d);
-    static void disableOffset(QOpenGLPaintEnginePrivate *d);
-
-private:
-    QOpenGLPaintEnginePrivate *d;
-};
-
-QOpenGLCoordinateOffset::QOpenGLCoordinateOffset(QOpenGLPaintEnginePrivate *d_)
-    : d(d_)
-{
-    enableOffset(d);
-}
-
-void QOpenGLCoordinateOffset::enableOffset(QOpenGLPaintEnginePrivate *d)
-{
-    if (!d->has_antialiasing) {
-        glMatrixMode(GL_MODELVIEW);
-        glPushMatrix();
-        d->mv_matrix[3][0] += 0.5;
-        d->mv_matrix[3][1] += 0.5;
-        d->updateGLMatrix();
-    }
-}
-
-QOpenGLCoordinateOffset::~QOpenGLCoordinateOffset()
-{
-    disableOffset(d);
-}
-
-void QOpenGLCoordinateOffset::disableOffset(QOpenGLPaintEnginePrivate *d)
-{
-    if (!d->has_antialiasing) {
-        glMatrixMode(GL_MODELVIEW);
-        glPopMatrix();
-        d->mv_matrix[3][0] -= 0.5;
-        d->mv_matrix[3][1] -= 0.5;
-    }
-}
-
-void QGLPrivateCleanup::cleanupGLContextRefs(const QGLContext *context)
-{
-    p->cleanupGLContextRefs(context);
-}
-
-
-static inline void updateTextureFilter(GLenum target, GLenum wrapMode, bool smoothPixmapTransform)
-{
-    if (smoothPixmapTransform) {
-        glTexParameterf(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-        glTexParameterf(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-    } else {
-        glTexParameterf(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-        glTexParameterf(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-    }
-    glTexParameterf(target, GL_TEXTURE_WRAP_S, wrapMode);
-    glTexParameterf(target, GL_TEXTURE_WRAP_T, wrapMode);
-}
-
-static inline QPainterPath strokeForPath(const QPainterPath &path, const QPen &cpen) {
-    QPainterPathStroker stroker;
-    if (cpen.style() == Qt::CustomDashLine)
-        stroker.setDashPattern(cpen.dashPattern());
-    else
-        stroker.setDashPattern(cpen.style());
-
-    stroker.setCapStyle(cpen.capStyle());
-    stroker.setJoinStyle(cpen.joinStyle());
-    stroker.setMiterLimit(cpen.miterLimit());
-    stroker.setDashOffset(cpen.dashOffset());
-
-    qreal width = cpen.widthF();
-    if (width == 0)
-        stroker.setWidth(1);
-    else
-        stroker.setWidth(width);
-
-    QPainterPath stroke = stroker.createStroke(path);
-    stroke.setFillRule(Qt::WindingFill);
-    return stroke;
-}
-
-class QGLStrokeCache
-{
-    struct CacheInfo
-    {
-        inline CacheInfo(QPainterPath p, QPainterPath sp, QPen stroke_pen) :
-            path(p), stroked_path(sp), pen(stroke_pen) {}
-        QPainterPath path;
-        QPainterPath stroked_path;
-        QPen pen;
-    };
-
-    typedef QMultiHash<quint64, CacheInfo> QGLStrokeTableHash;
-
-public:
-    inline QPainterPath getStrokedPath(const QPainterPath &path, const QPen &pen) {
-        quint64 hash_val = 0;
-
-        for (int i = 0; i < path.elementCount() && i <= 2; i++) {
-            hash_val += quint64(path.elementAt(i).x);
-            hash_val += quint64(path.elementAt(i).y);
-        }
-
-        QGLStrokeTableHash::const_iterator it = cache.constFind(hash_val);
-
-        if (it == cache.constEnd())
-            return addCacheElement(hash_val, path, pen);
-        else {
-            do {
-                const CacheInfo &cache_info = it.value();
-                if (cache_info.path == path && cache_info.pen == pen)
-                    return cache_info.stroked_path;
-                ++it;
-            } while (it != cache.constEnd() && it.key() == hash_val);
-            // an exact match for this path was not found, create new cache element
-            return addCacheElement(hash_val, path, pen);
-        }
-    }
-
-protected:
-    inline int maxCacheSize() const { return 500; }
-    QPainterPath addCacheElement(quint64 hash_val, QPainterPath path, const QPen &pen) {
-        if (cache.size() == maxCacheSize()) {
-            int elem_to_remove = qrand() % maxCacheSize();
-            cache.remove(cache.keys()[elem_to_remove]); // may remove more than 1, but OK
-        }
-        QPainterPath stroke = strokeForPath(path, pen);
-        CacheInfo cache_entry(path, stroke, pen);
-        return cache.insert(hash_val, cache_entry).value().stroked_path;
-    }
-
-    QGLStrokeTableHash cache;
-};
-
-Q_GLOBAL_STATIC(QGLStrokeCache, qt_opengl_stroke_cache)
-
-class QGLGradientCache : public QObject
-{
-    Q_OBJECT
-    struct CacheInfo
-    {
-        inline CacheInfo(QGradientStops s, qreal op, QGradient::InterpolationMode mode) :
-            stops(s), opacity(op), interpolationMode(mode) {}
-
-        GLuint texId;
-        QGradientStops stops;
-        qreal opacity;
-        QGradient::InterpolationMode interpolationMode;
-    };
-
-    typedef QMultiHash<quint64, CacheInfo> QGLGradientColorTableHash;
-
-public:
-    QGLGradientCache() : QObject(), buffer_ctx(0)
-    {
-        connect(QGLSignalProxy::instance(),
-                SIGNAL(aboutToDestroyContext(const QGLContext*)),
-                SLOT(cleanupGLContextRefs(const QGLContext*)));
-    }
-
-    inline GLuint getBuffer(const QGradient &gradient, qreal opacity, QGLContext *ctx) {
-        if (buffer_ctx && !QGLContext::areSharing(buffer_ctx, ctx))
-            cleanCache();
-
-        buffer_ctx = ctx;
-
-        quint64 hash_val = 0;
-
-        QGradientStops stops = gradient.stops();
-        for (int i = 0; i < stops.size() && i <= 2; i++)
-            hash_val += stops[i].second.rgba();
-
-        QGLGradientColorTableHash::const_iterator it = cache.constFind(hash_val);
-
-        if (it == cache.constEnd())
-            return addCacheElement(hash_val, gradient, opacity);
-        else {
-            do {
-                const CacheInfo &cache_info = it.value();
-                if (cache_info.stops == stops && cache_info.opacity == opacity && cache_info.interpolationMode == gradient.interpolationMode()) {
-                    return cache_info.texId;
-                }
-                ++it;
-            } while (it != cache.constEnd() && it.key() == hash_val);
-            // an exact match for these stops and opacity was not found, create new cache
-            return addCacheElement(hash_val, gradient, opacity);
-        }
-    }
-
-    inline int paletteSize() const { return 1024; }
-
-protected:
-    inline int maxCacheSize() const { return 60; }
-    inline void generateGradientColorTable(const QGradient& g,
-                                           uint *colorTable,
-                                           int size, qreal opacity) const;
-    GLuint addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity) {
-        if (cache.size() == maxCacheSize()) {
-            int elem_to_remove = qrand() % maxCacheSize();
-            quint64 key = cache.keys()[elem_to_remove];
-
-            // need to call glDeleteTextures on each removed cache entry:
-            QGLGradientColorTableHash::const_iterator it = cache.constFind(key);
-            do {
-                glDeleteTextures(1, &it.value().texId);
-            } while (++it != cache.constEnd() && it.key() == key);
-            cache.remove(key); // may remove more than 1, but OK
-        }
-        CacheInfo cache_entry(gradient.stops(), opacity, gradient.interpolationMode());
-        uint buffer[1024];
-        generateGradientColorTable(gradient, buffer, paletteSize(), opacity);
-        glGenTextures(1, &cache_entry.texId);
-#ifndef QT_OPENGL_ES
-        glBindTexture(GL_TEXTURE_1D, cache_entry.texId);
-        glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA, paletteSize(),
-                     0, GL_BGRA, GL_UNSIGNED_BYTE, buffer);
-#else
-        // create 2D one-line texture instead. This requires an impl of manual GL_TEXGEN for all primitives
-#endif
-        return cache.insert(hash_val, cache_entry).value().texId;
-    }
-
-    void cleanCache() {
-        QGLShareContextScope scope(buffer_ctx);
-        QGLGradientColorTableHash::const_iterator it = cache.constBegin();
-        for (; it != cache.constEnd(); ++it) {
-            const CacheInfo &cache_info = it.value();
-            glDeleteTextures(1, &cache_info.texId);
-        }
-        cache.clear();
-    }
-
-    QGLGradientColorTableHash cache;
-
-    QGLContext *buffer_ctx;
-
-public Q_SLOTS:
-    void cleanupGLContextRefs(const QGLContext *context) {
-        if (context == buffer_ctx) {
-            cleanCache();
-            buffer_ctx = 0;
-        }
-    }
-};
-
-static inline uint endianColor(uint c)
-{
-#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
-    return c;
-#else
-    return ( (c << 24) & 0xff000000)
-           | ((c >> 24) & 0x000000ff)
-           | ((c << 8) & 0x00ff0000)
-           | ((c >> 8) & 0x0000ff00);
-#endif // Q_BYTE_ORDER
-}
-
-void QGLGradientCache::generateGradientColorTable(const QGradient& gradient, uint *colorTable, int size, qreal opacity) const
-{
-    int pos = 0;
-    QGradientStops s = gradient.stops();
-    QVector<uint> colors(s.size());
-
-    for (int i = 0; i < s.size(); ++i)
-        colors[i] = s[i].second.rgba();
-
-    bool colorInterpolation = (gradient.interpolationMode() == QGradient::ColorInterpolation);
-
-    uint alpha = qRound(opacity * 256);
-    uint current_color = ARGB_COMBINE_ALPHA(colors[0], alpha);
-    qreal incr = 1.0 / qreal(size);
-    qreal fpos = 1.5 * incr;
-    colorTable[pos++] = endianColor(PREMUL(current_color));
-
-    while (fpos <= s.first().first) {
-        colorTable[pos] = colorTable[pos - 1];
-        pos++;
-        fpos += incr;
-    }
-
-    if (colorInterpolation)
-        current_color = PREMUL(current_color);
-
-    for (int i = 0; i < s.size() - 1; ++i) {
-        qreal delta = 1/(s[i+1].first - s[i].first);
-        uint next_color = ARGB_COMBINE_ALPHA(colors[i+1], alpha);
-        if (colorInterpolation)
-            next_color = PREMUL(next_color);
-
-        while (fpos < s[i+1].first && pos < size) {
-            int dist = int(256 * ((fpos - s[i].first) * delta));
-            int idist = 256 - dist;
-            if (colorInterpolation)
-                colorTable[pos] = endianColor(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist));
-            else
-                colorTable[pos] = endianColor(PREMUL(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist)));
-            ++pos;
-            fpos += incr;
-        }
-        current_color = next_color;
-    }
-
-    Q_ASSERT(s.size() > 0);
-
-    uint last_color = endianColor(PREMUL(ARGB_COMBINE_ALPHA(colors[s.size() - 1], alpha)));
-    for (;pos < size; ++pos)
-        colorTable[pos] = last_color;
-
-    // Make sure the last color stop is represented at the end of the table
-    colorTable[size-1] = last_color;
-}
-
-#ifndef Q_WS_QWS
-Q_GLOBAL_STATIC(QGLGradientCache, qt_opengl_gradient_cache)
-#endif
-
-void QOpenGLPaintEnginePrivate::createGradientPaletteTexture(const QGradient& g)
-{
-#ifdef QT_OPENGL_ES //###
-    Q_UNUSED(g);
-#else
-    GLuint texId = qt_opengl_gradient_cache()->getBuffer(g, opacity, device->context());
-    glBindTexture(GL_TEXTURE_1D, texId);
-    grad_palette = texId;
-    if (g.spread() == QGradient::RepeatSpread || g.type() == QGradient::ConicalGradient)
-        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_REPEAT);
-    else if (g.spread() == QGradient::ReflectSpread)
-        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT_IBM);
-    else
-        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-
-    glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-    glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-
-#endif
-}
-
-
-inline void QOpenGLPaintEnginePrivate::setGradientOps(const QBrush &brush, const QRectF &bounds)
-{
-    current_style = brush.style();
-
-    if (current_style < Qt::LinearGradientPattern || current_style > Qt::ConicalGradientPattern) {
-        setGLBrush(brush.color());
-        qt_glColor4ubv(brush_color);
-    }
-
-    updateGradient(brush, bounds);
-
-#ifndef QT_OPENGL_ES //### GLES does not have GL_TEXTURE_GEN_ so we are falling back for gradients
-    glDisable(GL_TEXTURE_GEN_S);
-    glDisable(GL_TEXTURE_1D);
-
-    if (current_style == Qt::LinearGradientPattern) {
-        if (high_quality_antialiasing || !has_fast_composition_mode) {
-            fragment_brush = FRAGMENT_PROGRAM_BRUSH_LINEAR;
-        } else {
-            glEnable(GL_TEXTURE_GEN_S);
-            glEnable(GL_TEXTURE_1D);
-        }
-    } else {
-        if (use_fragment_programs) {
-            if (current_style == Qt::RadialGradientPattern)
-                fragment_brush = FRAGMENT_PROGRAM_BRUSH_RADIAL;
-            else if (current_style == Qt::ConicalGradientPattern)
-                fragment_brush = FRAGMENT_PROGRAM_BRUSH_CONICAL;
-            else if (current_style == Qt::SolidPattern)
-                fragment_brush = FRAGMENT_PROGRAM_BRUSH_SOLID;
-            else if (current_style == Qt::TexturePattern && !brush.texture().isQBitmap())
-                fragment_brush = FRAGMENT_PROGRAM_BRUSH_TEXTURE;
-            else
-                fragment_brush = FRAGMENT_PROGRAM_BRUSH_PATTERN;
-        }
-    }
-#endif
-}
-
-QOpenGLPaintEngine::QOpenGLPaintEngine()
-    : QPaintEngineEx(*(new QOpenGLPaintEnginePrivate))
-{
-}
-
-QOpenGLPaintEngine::~QOpenGLPaintEngine()
-{
-}
-
-bool QOpenGLPaintEngine::begin(QPaintDevice *pdev)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    if (pdev->devType() == QInternal::OpenGL)
-        d->device = static_cast<QGLPaintDevice*>(pdev);
-    else
-        d->device = QGLPaintDevice::getDevice(pdev);
-
-    if (!d->device)
-        return false;
-
-    d->offscreen.setDevice(pdev);
-    d->has_fast_pen = false;
-    d->inverseScale = 1;
-    d->opacity = 1;
-    d->device->beginPaint();
-    d->matrix = QTransform();
-    d->has_antialiasing = false;
-    d->high_quality_antialiasing = false;
-
-    QSize sz(d->device->size());
-    d->dirty_stencil = QRect(0, 0, sz.width(), sz.height());
-
-    d->use_emulation = false;
-
-    for (int i = 0; i < 4; ++i)
-        for (int j = 0; j < 4; ++j)
-            d->mv_matrix[i][j] = (i == j ? qreal(1) : qreal(0));
-
-    bool has_frag_program = (QGLExtensions::glExtensions() & QGLExtensions::FragmentProgram)
-                            && (pdev->devType() != QInternal::Pixmap);
-
-    QGLContext *ctx = const_cast<QGLContext *>(d->device->context());
-    if (!ctx) {
-        qWarning() << "QOpenGLPaintEngine: paint device doesn't have a valid GL context.";
-        return false;
-    }
-
-    if (has_frag_program)
-        has_frag_program = qt_resolve_frag_program_extensions(ctx) && qt_resolve_version_1_3_functions(ctx);
-
-    d->use_stencil_method = d->device->format().stencil()
-                            && (QGLExtensions::glExtensions() & QGLExtensions::StencilWrap);
-    if (d->device->format().directRendering()
-        && (d->use_stencil_method && QGLExtensions::glExtensions() & QGLExtensions::StencilTwoSide))
-        d->has_stencil_face_ext = qt_resolve_stencil_face_extension(ctx);
-
-#ifdef Q_WS_X11
-    static bool nvidia_workaround_needs_init = true;
-    if (nvidia_workaround_needs_init) {
-        // nvidia 9x.xx unix drivers contain a bug which requires us to
-        // call glFinish before releasing an fbo to avoid painting
-        // artifacts
-        const QByteArray versionString(reinterpret_cast<const char*>(glGetString(GL_VERSION)));
-        const int pos = versionString.indexOf("NVIDIA");
-        if (pos >= 0) {
-            const float nvidiaDriverVersion = versionString.mid(pos + strlen("NVIDIA")).toFloat();
-            qt_nvidiaFboNeedsFinish = nvidiaDriverVersion >= 90.0 && nvidiaDriverVersion < 100.0;
-        }
-        nvidia_workaround_needs_init = false;
-    }
-#endif
-
-#ifndef QT_OPENGL_ES
-    if (!ctx->d_ptr->internal_context) {
-        glGetDoublev(GL_PROJECTION_MATRIX, &d->projection_matrix[0][0]);
-        glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
-        glPushAttrib(GL_ALL_ATTRIB_BITS);
-
-        glDisableClientState(GL_EDGE_FLAG_ARRAY);
-        glDisableClientState(GL_INDEX_ARRAY);
-        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-        glDisable(GL_TEXTURE_1D);
-        glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
-        glPixelTransferi(GL_MAP_COLOR, false);
-        glPixelTransferi(GL_MAP_STENCIL, false);
-        glDisable(GL_TEXTURE_GEN_S);
-
-        glPixelStorei(GL_PACK_SWAP_BYTES, false);
-        glPixelStorei(GL_PACK_LSB_FIRST, false);
-        glPixelStorei(GL_PACK_ROW_LENGTH, 0);
-        glPixelStorei(GL_PACK_SKIP_ROWS, 0);
-        glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
-        glPixelStorei(GL_PACK_ALIGNMENT, 4);
-
-        glPixelStorei(GL_UNPACK_SWAP_BYTES, false);
-        glPixelStorei(GL_UNPACK_LSB_FIRST, false);
-        glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
-        glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
-        glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
-        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
-
-        if (QGLFormat::openGLVersionFlags() & QGLFormat::OpenGL_Version_1_2) {
-            glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
-            glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
-            glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, 0);
-            glPixelStorei(GL_UNPACK_SKIP_IMAGES, 0);
-        }
-    }
-#endif
-
-    if (!ctx->d_ptr->internal_context) {
-        glMatrixMode(GL_MODELVIEW);
-        glPushMatrix();
-        glMatrixMode(GL_TEXTURE);
-        glPushMatrix();
-        glLoadIdentity();
-        glDisableClientState(GL_COLOR_ARRAY);
-        glDisableClientState(GL_NORMAL_ARRAY);
-        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
-        glDisableClientState(GL_VERTEX_ARRAY);
-
-        if (QGLExtensions::glExtensions() & QGLExtensions::SampleBuffers)
-            glDisable(GL_MULTISAMPLE);
-        glDisable(GL_TEXTURE_2D);
-        if (QGLExtensions::glExtensions() & QGLExtensions::TextureRectangle)
-            glDisable(GL_TEXTURE_RECTANGLE_NV);
-        glDisable(GL_STENCIL_TEST);
-        glDisable(GL_CULL_FACE);
-        glDisable(GL_LIGHTING);
-        glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-    }
-
-    d->offscreen.begin();
-
-    glViewport(0, 0, sz.width(), sz.height()); // XXX (Embedded): We need a solution for GLWidgets that draw in a part or a bigger surface...
-    glMatrixMode(GL_PROJECTION);
-    glLoadIdentity();
-#ifdef QT_OPENGL_ES
-    glOrthof(0, sz.width(), sz.height(), 0, -999999, 999999);
-#else
-    glOrtho(0, sz.width(), sz.height(), 0, -999999, 999999);
-#endif
-    glMatrixMode(GL_MODELVIEW);
-    glLoadIdentity();
-    glEnable(GL_BLEND);
-    d->composition_mode = QPainter::CompositionMode_SourceOver;
-
-#ifdef QT_OPENGL_ES
-    d->max_texture_size = ctx->d_func()->maxTextureSize();
-#else
-    bool shared_ctx = QGLContext::areSharing(d->device->context(), d->shader_ctx);
-
-    if (shared_ctx) {
-        d->max_texture_size = d->shader_ctx->d_func()->maxTextureSize();
-    } else {
-        d->max_texture_size = ctx->d_func()->maxTextureSize();
-
-        if (d->shader_ctx) {
-            d->shader_ctx->makeCurrent();
-            glBindTexture(GL_TEXTURE_1D, 0);
-            glDeleteTextures(1, &d->grad_palette);
-
-            if (has_frag_program && d->use_fragment_programs)
-                glDeleteTextures(1, &d->drawable_texture);
-            ctx->makeCurrent();
-        }
-        d->shader_ctx = d->device->context();
-        glGenTextures(1, &d->grad_palette);
-
-        qt_mask_texture_cache()->clearCache();
-        d->use_fragment_programs = has_frag_program;
-    }
-
-    if (d->use_fragment_programs && (!shared_ctx || sz.width() > d->drawable_texture_size.width()
-                                     || sz.height() > d->drawable_texture_size.height()))
-    {
-        // delete old texture if size has increased, otherwise it was deleted earlier
-        if (shared_ctx)
-            glDeleteTextures(1, &d->drawable_texture);
-
-        d->dirty_drawable_texture = true;
-        d->drawable_texture_size = QSize(qt_next_power_of_two(sz.width()),
-                                         qt_next_power_of_two(sz.height()));
-    }
-#endif
-
-    updateClipRegion(QRegion(), Qt::NoClip);
-    penChanged();
-    brushChanged();
-    opacityChanged();
-    compositionModeChanged();
-    renderHintsChanged();
-    transformChanged();
-    return true;
-}
-
-bool QOpenGLPaintEngine::end()
-{
-    Q_D(QOpenGLPaintEngine);
-    d->flushDrawQueue();
-    d->offscreen.end();
-    QGLContext *ctx = const_cast<QGLContext *>(d->device->context());
-    if (!ctx->d_ptr->internal_context) {
-        glMatrixMode(GL_TEXTURE);
-        glPopMatrix();
-        glMatrixMode(GL_MODELVIEW);
-        glPopMatrix();
-    }
-#ifndef QT_OPENGL_ES
-    if (ctx->d_ptr->internal_context) {
-        glDisable(GL_SCISSOR_TEST);
-    } else {
-        glMatrixMode(GL_PROJECTION);
-        glLoadMatrixd(&d->projection_matrix[0][0]);
-        glPopAttrib();
-        glPopClientAttrib();
-    }
-#endif
-    d->device->endPaint();
-    qt_mask_texture_cache()->maintainCache();
-
-#if defined(Q_WS_X11)
-    // clear out the references we hold for textures bound with the
-    // texture_from_pixmap extension
-    ctx->d_func()->boundPixmaps.clear();
-#endif
-    return true;
-}
-
-void QOpenGLPaintEngine::updateState(const QPaintEngineState &state)
-{
-    Q_D(QOpenGLPaintEngine);
-    QPaintEngine::DirtyFlags flags = state.state();
-
-    bool update_fast_pen = false;
-
-    if (flags & DirtyOpacity) {
-        update_fast_pen = true;
-        d->opacity = state.opacity();
-        if (d->opacity > 1.0f)
-            d->opacity = 1.0f;
-        if (d->opacity < 0.f)
-            d->opacity = 0.f;
-        // force update
-        flags |= DirtyPen;
-        flags |= DirtyBrush;
-    }
-
-    if (flags & DirtyTransform) {
-        update_fast_pen = true;
-        updateMatrix(state.transform());
-        // brush setup depends on transform state
-        if (state.brush().style() != Qt::NoBrush)
-            flags |= DirtyBrush;
-    }
-
-    if (flags & DirtyPen) {
-        update_fast_pen = true;
-        updatePen(state.pen());
-    }
-
-    if (flags & (DirtyBrush | DirtyBrushOrigin)) {
-        updateBrush(state.brush(), state.brushOrigin());
-    }
-
-    if (flags & DirtyFont) {
-        updateFont(state.font());
-    }
-
-    if (state.state() & DirtyClipEnabled) {
-        if (state.isClipEnabled())
-            updateClipRegion(painter()->clipRegion(), Qt::ReplaceClip);
-        else
-            updateClipRegion(QRegion(), Qt::NoClip);
-    }
-
-    if (flags & DirtyClipPath) {
-        updateClipRegion(QRegion(state.clipPath().toFillPolygon().toPolygon(),
-                                 state.clipPath().fillRule()),
-                         state.clipOperation());
-    }
-
-    if (flags & DirtyClipRegion) {
-        updateClipRegion(state.clipRegion(), state.clipOperation());
-    }
-
-    if (flags & DirtyHints) {
-        updateRenderHints(state.renderHints());
-    }
-
-    if (flags & DirtyCompositionMode) {
-        updateCompositionMode(state.compositionMode());
-    }
-
-    if (update_fast_pen) {
-        Q_D(QOpenGLPaintEngine);
-        qreal pen_width = d->cpen.widthF();
-        d->has_fast_pen =
-            ((pen_width == 0 || (pen_width <= 1 && d->txop <= QTransform::TxTranslate))
-             || d->cpen.isCosmetic())
-            && d->cpen.style() == Qt::SolidLine
-            && d->cpen.isSolid();
-    }
-}
-
-
-void QOpenGLPaintEnginePrivate::setInvMatrixData(const QTransform &inv_matrix)
-{
-    inv_matrix_data[0][0] = inv_matrix.m11();
-    inv_matrix_data[1][0] = inv_matrix.m21();
-    inv_matrix_data[2][0] = inv_matrix.m31();
-
-    inv_matrix_data[0][1] = inv_matrix.m12();
-    inv_matrix_data[1][1] = inv_matrix.m22();
-    inv_matrix_data[2][1] = inv_matrix.m32();
-
-    inv_matrix_data[0][2] = inv_matrix.m13();
-    inv_matrix_data[1][2] = inv_matrix.m23();
-    inv_matrix_data[2][2] = inv_matrix.m33();
-}
-
-
-void QOpenGLPaintEnginePrivate::updateGradient(const QBrush &brush, const QRectF &)
-{
-#ifdef QT_OPENGL_ES
-    Q_UNUSED(brush);
-#else
-    bool has_mirrored_repeat = QGLExtensions::glExtensions() & QGLExtensions::MirroredRepeat;
-    Qt::BrushStyle style = brush.style();
-
-    QTransform m = brush.transform();
-
-    if (has_mirrored_repeat && style == Qt::LinearGradientPattern) {
-        const QLinearGradient *g = static_cast<const QLinearGradient *>(brush.gradient());
-        QTransform m = brush.transform();
-        QPointF realStart = g->start();
-        QPointF realFinal = g->finalStop();
-        QPointF start = m.map(realStart);
-        QPointF stop;
-
-        if (qFuzzyCompare(m.m11(), m.m22()) && m.m12() == 0.0 && m.m21() == 0.0) {
-            // It is a simple uniform scale and/or translation
-            stop = m.map(realFinal);
-        } else {
-            // It is not enough to just transform the endpoints.
-            // We have to make sure the _pattern_ is transformed correctly.
-
-            qreal odx = realFinal.x() - realStart.x();
-            qreal ody = realFinal.y() - realStart.y();
-
-            // nx, ny and dx, dy are normal and gradient direction after transform:
-            qreal nx = m.m11()*ody - m.m21()*odx;
-            qreal ny = m.m12()*ody - m.m22()*odx;
-
-            qreal dx = m.m11()*odx + m.m21()*ody;
-            qreal dy = m.m12()*odx + m.m22()*ody;
-
-            qreal lx = 1 / (dx - dy*nx/ny);
-            qreal ly = 1 / (dy - dx*ny/nx);
-            qreal l = 1 / qSqrt(lx*lx+ly*ly);
-
-            stop = start + QPointF(-ny, nx) * l/qSqrt(nx*nx+ny*ny);
-        }
-
-        float tr[4], f;
-        tr[0] = stop.x() - start.x();
-        tr[1] = stop.y() - start.y();
-        f = 1.0 / (tr[0]*tr[0] + tr[1]*tr[1]);
-        tr[0] *= f;
-        tr[1] *= f;
-        tr[2] = 0;
-        tr[3] = -(start.x()*tr[0] + start.y()*tr[1]);
-        brush_color[0] = brush_color[1] = brush_color[2] = brush_color[3] = 255;
-        qt_glColor4ubv(brush_color);
-        glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
-        glTexGenfv(GL_S, GL_OBJECT_PLANE, tr);
-    }
-
-    if (use_fragment_programs) {
-        if (style == Qt::RadialGradientPattern) {
-            const QRadialGradient *g = static_cast<const QRadialGradient *>(brush.gradient());
-            QPointF realCenter = g->center();
-            QPointF realFocal  = g->focalPoint();
-            qreal   realRadius = g->radius();
-            QTransform translate(1, 0, 0, 1, -realFocal.x(), -realFocal.y());
-            QTransform gl_to_qt(1, 0, 0, -1, 0, pdev->height());
-            QTransform m = QTransform(matrix).translate(brush_origin.x(), brush_origin.y());
-            QTransform inv_matrix = gl_to_qt * (brush.transform() * m).inverted() * translate;
-
-            setInvMatrixData(inv_matrix);
-
-            fmp_data[0] = realCenter.x() - realFocal.x();
-            fmp_data[1] = realCenter.y() - realFocal.y();
-
-            fmp2_m_radius2_data[0] = -fmp_data[0] * fmp_data[0] - fmp_data[1] * fmp_data[1] + realRadius * realRadius;
-        } else if (style == Qt::ConicalGradientPattern) {
-            const QConicalGradient *g = static_cast<const QConicalGradient *>(brush.gradient());
-            QPointF realCenter = g->center();
-            QTransform translate(1, 0, 0, 1, -realCenter.x(), -realCenter.y());
-            QTransform gl_to_qt(1, 0, 0, -1, 0, pdev->height());
-            QTransform m = QTransform(matrix).translate(brush_origin.x(), brush_origin.y());
-            QTransform inv_matrix = gl_to_qt * (brush.transform() * m).inverted() * translate;
-
-            setInvMatrixData(inv_matrix);
-
-            angle_data[0] = -(g->angle() * 2 * Q_PI) / 360.0;
-        } else if (style == Qt::LinearGradientPattern) {
-            const QLinearGradient *g = static_cast<const QLinearGradient *>(brush.gradient());
-
-            QPointF realStart = g->start();
-            QPointF realFinal = g->finalStop();
-            QTransform translate(1, 0, 0, 1, -realStart.x(), -realStart.y());
-            QTransform gl_to_qt(1, 0, 0, -1, 0, pdev->height());
-            QTransform m = QTransform(matrix).translate(brush_origin.x(), brush_origin.y());
-            QTransform inv_matrix = gl_to_qt * (brush.transform() * m).inverted() * translate;
-
-            setInvMatrixData(inv_matrix);
-
-            QPointF l = realFinal - realStart;
-
-            linear_data[0] = l.x();
-            linear_data[1] = l.y();
-
-            linear_data[2] = 1.0f / (l.x() * l.x() + l.y() * l.y());
-        } else if (style != Qt::SolidPattern) {
-            QTransform gl_to_qt(1, 0, 0, -1, 0, pdev->height());
-            QTransform m = QTransform(matrix).translate(brush_origin.x(), brush_origin.y());
-            QTransform inv_matrix = gl_to_qt * (brush.transform() * m).inverted();
-
-            setInvMatrixData(inv_matrix);
-        }
-    }
-
-    if (style >= Qt::LinearGradientPattern && style <= Qt::ConicalGradientPattern) {
-        createGradientPaletteTexture(*brush.gradient());
-    }
-#endif
-}
-
-
-class QOpenGLTessellator : public QTessellator
-{
-public:
-    QOpenGLTessellator() {}
-    ~QOpenGLTessellator() { }
-    QGLTrapezoid toGLTrapezoid(const Trapezoid &trap);
-};
-
-QGLTrapezoid QOpenGLTessellator::toGLTrapezoid(const Trapezoid &trap)
-{
-    QGLTrapezoid t;
-
-    t.top = Q27Dot5ToDouble(trap.top);
-    t.bottom = Q27Dot5ToDouble(trap.bottom);
-
-    Q27Dot5 y = trap.topLeft->y - trap.bottomLeft->y;
-
-    qreal topLeftY = Q27Dot5ToDouble(trap.topLeft->y);
-
-    qreal tx = Q27Dot5ToDouble(trap.topLeft->x);
-    qreal m = (-tx + Q27Dot5ToDouble(trap.bottomLeft->x)) / Q27Dot5ToDouble(y);
-    t.topLeftX = tx + m * (topLeftY - t.top);
-    t.bottomLeftX = tx + m * (topLeftY - t.bottom);
-
-    y = trap.topRight->y - trap.bottomRight->y;
-
-    qreal topRightY = Q27Dot5ToDouble(trap.topRight->y);
-
-    tx = Q27Dot5ToDouble(trap.topRight->x);
-    m = (-tx + Q27Dot5ToDouble(trap.bottomRight->x)) / Q27Dot5ToDouble(y);
-
-    t.topRightX = tx + m * (topRightY - Q27Dot5ToDouble(trap.top));
-    t.bottomRightX = tx + m * (topRightY - Q27Dot5ToDouble(trap.bottom));
-
-    return t;
-}
-
-class QOpenGLImmediateModeTessellator : public QOpenGLTessellator
-{
-public:
-    void addTrap(const Trapezoid &trap);
-    void tessellate(const QPointF *points, int nPoints, bool winding) {
-        trapezoids.reserve(trapezoids.size() + nPoints);
-        setWinding(winding);
-        QTessellator::tessellate(points, nPoints);
-    }
-
-    QVector<QGLTrapezoid> trapezoids;
-};
-
-void QOpenGLImmediateModeTessellator::addTrap(const Trapezoid &trap)
-{
-    trapezoids.append(toGLTrapezoid(trap));
-}
-
-#ifndef QT_OPENGL_ES
-static void drawTrapezoid(const QGLTrapezoid &trap, const qreal offscreenHeight, QGLContext *ctx)
-{
-    qreal minX = qMin(trap.topLeftX, trap.bottomLeftX);
-    qreal maxX = qMax(trap.topRightX, trap.bottomRightX);
-
-    if (qFuzzyCompare(trap.top, trap.bottom) || qFuzzyCompare(minX, maxX) ||
-        (qFuzzyCompare(trap.topLeftX, trap.topRightX) && qFuzzyCompare(trap.bottomLeftX, trap.bottomRightX)))
-        return;
-
-    const qreal xpadding = 1.0;
-    const qreal ypadding = 1.0;
-
-    qreal topDist = offscreenHeight - trap.top;
-    qreal bottomDist = offscreenHeight - trap.bottom;
-
-    qreal reciprocal = bottomDist / (bottomDist - topDist);
-
-    qreal leftB = trap.bottomLeftX + (trap.topLeftX - trap.bottomLeftX) * reciprocal;
-    qreal rightB = trap.bottomRightX + (trap.topRightX - trap.bottomRightX) * reciprocal;
-
-    const bool topZero = qFuzzyIsNull(topDist);
-
-    reciprocal = topZero ? 1.0 / bottomDist : 1.0 / topDist;
-
-    qreal leftA = topZero ? (trap.bottomLeftX - leftB) * reciprocal : (trap.topLeftX - leftB) * reciprocal;
-    qreal rightA = topZero ? (trap.bottomRightX - rightB) * reciprocal : (trap.topRightX - rightB) * reciprocal;
-
-    qreal invLeftA = qFuzzyIsNull(leftA) ? 0.0 : 1.0 / leftA;
-    qreal invRightA = qFuzzyIsNull(rightA) ? 0.0 : 1.0 / rightA;
-
-    // fragment program needs the negative of invRightA as it mirrors the line
-    glTexCoord4f(topDist, bottomDist, invLeftA, -invRightA);
-    glMultiTexCoord4f(GL_TEXTURE1, leftA, leftB, rightA, rightB);
-
-    qreal topY = trap.top - ypadding;
-    qreal bottomY = trap.bottom + ypadding;
-
-    qreal bounds_bottomLeftX = leftA * (offscreenHeight - bottomY) + leftB;
-    qreal bounds_bottomRightX = rightA * (offscreenHeight - bottomY) + rightB;
-    qreal bounds_topLeftX = leftA * (offscreenHeight - topY) + leftB;
-    qreal bounds_topRightX = rightA * (offscreenHeight - topY) + rightB;
-
-    QPointF leftNormal(1, -leftA);
-    leftNormal /= qSqrt(leftNormal.x() * leftNormal.x() + leftNormal.y() * leftNormal.y());
-    QPointF rightNormal(1, -rightA);
-    rightNormal /= qSqrt(rightNormal.x() * rightNormal.x() + rightNormal.y() * rightNormal.y());
-
-    qreal left_padding = xpadding / qAbs(leftNormal.x());
-    qreal right_padding = xpadding / qAbs(rightNormal.x());
-
-    glVertex2d(bounds_topLeftX - left_padding, topY);
-    glVertex2d(bounds_topRightX + right_padding, topY);
-    glVertex2d(bounds_bottomRightX + right_padding, bottomY);
-    glVertex2d(bounds_bottomLeftX - left_padding, bottomY);
-
-    glTexCoord4f(0.0f, 0.0f, 0.0f, 1.0f);
-}
-#endif // !Q_WS_QWS
-
-class QOpenGLTrapezoidToArrayTessellator : public QOpenGLTessellator
-{
-public:
-    QOpenGLTrapezoidToArrayTessellator() : vertices(0), allocated(0), size(0) {}
-    ~QOpenGLTrapezoidToArrayTessellator() { free(vertices); }
-    GLfloat *vertices;
-    int allocated;
-    int size;
-    QRectF bounds;
-    void addTrap(const Trapezoid &trap);
-    void tessellate(const QPointF *points, int nPoints, bool winding) {
-        size = 0;
-        setWinding(winding);
-        bounds = QTessellator::tessellate(points, nPoints);
-    }
-};
-
-void QOpenGLTrapezoidToArrayTessellator::addTrap(const Trapezoid &trap)
-{
-    // On OpenGL ES we convert the trap to 2 triangles
-#ifndef QT_OPENGL_ES
-    if (size > allocated - 8) {
-#else
-    if (size > allocated - 12) {
-#endif
-        allocated = qMax(2*allocated, 512);
-        vertices = (GLfloat *)realloc(vertices, allocated * sizeof(GLfloat));
-    }
-
-    QGLTrapezoid t = toGLTrapezoid(trap);
-
-#ifndef QT_OPENGL_ES
-    vertices[size++] = t.topLeftX;
-    vertices[size++] = t.top;
-    vertices[size++] = t.topRightX;
-    vertices[size++] = t.top;
-    vertices[size++] = t.bottomRightX;
-    vertices[size++] = t.bottom;
-    vertices[size++] = t.bottomLeftX;
-    vertices[size++] = t.bottom;
-#else
-    // First triangle
-    vertices[size++] = t.topLeftX;
-    vertices[size++] = t.top;
-    vertices[size++] = t.topRightX;
-    vertices[size++] = t.top;
-    vertices[size++] = t.bottomRightX;
-    vertices[size++] = t.bottom;
-
-    // Second triangle
-    vertices[size++] = t.bottomLeftX;
-    vertices[size++] = t.bottom;
-    vertices[size++] = t.topLeftX;
-    vertices[size++] = t.top;
-    vertices[size++] = t.bottomRightX;
-    vertices[size++] = t.bottom;
-#endif
-}
-
-
-void QOpenGLPaintEnginePrivate::fillPolygon_dev(const QPointF *polygonPoints, int pointCount,
-                                                Qt::FillRule fill)
-{
-    QOpenGLTrapezoidToArrayTessellator tessellator;
-    tessellator.tessellate(polygonPoints, pointCount, fill == Qt::WindingFill);
-
-    DEBUG_ONCE qDebug() << "QOpenGLPaintEnginePrivate: Drawing polygon with" << pointCount << "points using fillPolygon_dev";
-
-    setGradientOps(cbrush, tessellator.bounds);
-
-    bool fast_style = current_style == Qt::LinearGradientPattern
-                      || current_style == Qt::SolidPattern;
-
-#ifndef QT_OPENGL_ES
-    GLenum geometry_mode = GL_QUADS;
-#else
-    GLenum geometry_mode = GL_TRIANGLES;
-#endif
-
-    if (use_fragment_programs && !(fast_style && has_fast_composition_mode)) {
-        composite(geometry_mode, tessellator.vertices, tessellator.size / 2);
-    } else {
-        glVertexPointer(2, GL_FLOAT, 0, tessellator.vertices);
-        glEnableClientState(GL_VERTEX_ARRAY);
-        glDrawArrays(geometry_mode, 0, tessellator.size/2);
-        glDisableClientState(GL_VERTEX_ARRAY);
-    }
-}
-
-
-inline void QOpenGLPaintEnginePrivate::lineToStencil(qreal x, qreal y)
-{
-    tess_points.add(QPointF(x, y));
-
-    if (x > max_x)
-        max_x = x;
-    else if (x < min_x)
-        min_x = x;
-    if (y > max_y)
-        max_y = y;
-    else if (y < min_y)
-        min_y = y;
-}
-
-inline void QOpenGLPaintEnginePrivate::curveToStencil(const QPointF &cp1, const QPointF &cp2, const QPointF &ep)
-{
-    qreal inverseScaleHalf = inverseScale / 2;
-
-    QBezier beziers[32];
-    beziers[0] = QBezier::fromPoints(tess_points.last(), cp1, cp2, ep);
-    QBezier *b = beziers;
-    while (b >= beziers) {
-        // check if we can pop the top bezier curve from the stack
-        qreal l = qAbs(b->x4 - b->x1) + qAbs(b->y4 - b->y1);
-        qreal d;
-        if (l > inverseScale) {
-            d = qAbs( (b->x4 - b->x1)*(b->y1 - b->y2) - (b->y4 - b->y1)*(b->x1 - b->x2) )
-                + qAbs( (b->x4 - b->x1)*(b->y1 - b->y3) - (b->y4 - b->y1)*(b->x1 - b->x3) );
-            d /= l;
-        } else {
-            d = qAbs(b->x1 - b->x2) + qAbs(b->y1 - b->y2) +
-                qAbs(b->x1 - b->x3) + qAbs(b->y1 - b->y3);
-        }
-        if (d < inverseScaleHalf || b == beziers + 31) {
-            // good enough, we pop it off and add the endpoint
-            lineToStencil(b->x4, b->y4);
-            --b;
-        } else {
-            // split, second half of the polygon goes lower into the stack
-            b->split(b+1, b);
-           ++b;
-        }
-    }
-}
-
-
-void QOpenGLPaintEnginePrivate::pathToVertexArrays(const QPainterPath &path)
-{
-    const QPainterPath::Element &first = path.elementAt(0);
-    min_x = max_x = first.x;
-    min_y = max_y = first.y;
-
-    tess_points.reset();
-    tess_points_stops.clear();
-    lineToStencil(first.x, first.y);
-
-    for (int i=1; i<path.elementCount(); ++i) {
-        const QPainterPath::Element &e = path.elementAt(i);
-        switch (e.type) {
-        case QPainterPath::MoveToElement:
-            tess_points_stops.append(tess_points.size());
-            lineToStencil(e.x, e.y);
-            break;
-        case QPainterPath::LineToElement:
-            lineToStencil(e.x, e.y);
-            break;
-        case QPainterPath::CurveToElement:
-            curveToStencil(e, path.elementAt(i+1), path.elementAt(i+2));
-            i+=2;
-            break;
-        default:
-            break;
-        }
-    }
-    lineToStencil(first.x, first.y);
-    tess_points_stops.append(tess_points.size());
-}
-
-
-void QOpenGLPaintEnginePrivate::drawVertexArrays()
-{
-    if (tess_points_stops.count() == 0)
-        return;
-    glEnableClientState(GL_VERTEX_ARRAY);
-    glVertexPointer(2, GL_DOUBLE, 0, tess_points.data());
-    int previous_stop = 0;
-    foreach(int stop, tess_points_stops) {
-        glDrawArrays(GL_TRIANGLE_FAN, previous_stop, stop-previous_stop);
-        previous_stop = stop;
-    }
-    glDisableClientState(GL_VERTEX_ARRAY);
-}
-
-void QOpenGLPaintEnginePrivate::fillVertexArray(Qt::FillRule fillRule)
-{
-    Q_Q(QOpenGLPaintEngine);
-
-    QRect rect = dirty_stencil.boundingRect();
-
-    if (use_system_clip)
-        rect = q->systemClip().intersected(dirty_stencil).boundingRect();
-
-    glStencilMask(~0);
-
-    if (!rect.isEmpty()) {
-        disableClipping();
-
-        glEnable(GL_SCISSOR_TEST);
-
-        const int left = rect.left();
-        const int width = rect.width();
-        const int bottom = device->size().height() - (rect.bottom() + 1);
-        const int height = rect.height();
-
-        glScissor(left, bottom, width, height);
-
-        glClearStencil(0);
-        glClear(GL_STENCIL_BUFFER_BIT);
-        dirty_stencil -= rect;
-
-        glDisable(GL_SCISSOR_TEST);
-
-        enableClipping();
-    }
-
-    // Enable stencil.
-    glEnable(GL_STENCIL_TEST);
-
-    // Disable color writes.
-    glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
-
-    GLuint stencilMask = 0;
-
-    if (fillRule == Qt::OddEvenFill) {
-        stencilMask = 1;
-
-        // Enable stencil writes.
-        glStencilMask(stencilMask);
-
-        // Set stencil xor mode.
-        glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT);
-
-        // Disable stencil func.
-        glStencilFunc(GL_ALWAYS, 0, ~0);
-
-        drawVertexArrays();
-    } else if (fillRule == Qt::WindingFill) {
-        stencilMask = ~0;
-
-        if (has_stencil_face_ext) {
-            QGL_FUNC_CONTEXT;
-            glEnable(GL_STENCIL_TEST_TWO_SIDE_EXT);
-
-            glActiveStencilFaceEXT(GL_BACK);
-            glStencilOp(GL_KEEP, GL_KEEP, GL_DECR_WRAP_EXT);
-            glStencilFunc(GL_ALWAYS, 0, ~0);
-
-            glActiveStencilFaceEXT(GL_FRONT);
-            glStencilOp(GL_KEEP, GL_KEEP, GL_INCR_WRAP_EXT);
-            glStencilFunc(GL_ALWAYS, 0, ~0);
-
-            drawVertexArrays();
-
-            glDisable(GL_STENCIL_TEST_TWO_SIDE_EXT);
-        } else {
-            glStencilFunc(GL_ALWAYS, 0, ~0);
-            glEnable(GL_CULL_FACE);
-
-            glCullFace(GL_BACK);
-            glStencilOp(GL_KEEP, GL_KEEP, GL_INCR_WRAP_EXT);
-            drawVertexArrays();
-
-            glCullFace(GL_FRONT);
-            glStencilOp(GL_KEEP, GL_KEEP, GL_DECR_WRAP_EXT);
-            drawVertexArrays();
-
-            glDisable(GL_CULL_FACE);
-        }
-    }
-
-    // Enable color writes.
-    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-    glStencilMask(stencilMask);
-
-    setGradientOps(cbrush, QRectF(QPointF(min_x, min_y), QSizeF(max_x - min_x, max_y - min_y)));
-
-    bool fast_fill = has_fast_composition_mode && (current_style == Qt::LinearGradientPattern || current_style == Qt::SolidPattern);
-
-    if (use_fragment_programs && !fast_fill) {
-        DEBUG_ONCE qDebug() << "QOpenGLPaintEnginePrivate: Drawing polygon using stencil method (fragment programs)";
-        QRectF rect(QPointF(min_x, min_y), QSizeF(max_x - min_x, max_y - min_y));
-
-        // Enable stencil func.
-        glStencilFunc(GL_NOTEQUAL, 0, stencilMask);
-        glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
-        composite(rect);
-    } else {
-        DEBUG_ONCE qDebug() << "QOpenGLPaintEnginePrivate: Drawing polygon using stencil method (no fragment programs)";
-
-        // Enable stencil func.
-        glStencilFunc(GL_NOTEQUAL, 0, stencilMask);
-        glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
-#ifndef QT_OPENGL_ES
-        glBegin(GL_QUADS);
-        glVertex2f(min_x, min_y);
-        glVertex2f(max_x, min_y);
-        glVertex2f(max_x, max_y);
-        glVertex2f(min_x, max_y);
-        glEnd();
-#endif
-    }
-
-    // Disable stencil writes.
-    glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
-    glStencilMask(0);
-    glDisable(GL_STENCIL_TEST);
-}
-
-void QOpenGLPaintEnginePrivate::fillPath(const QPainterPath &path)
-{
-    if (path.isEmpty())
-        return;
-
-    if (use_stencil_method && !high_quality_antialiasing) {
-        pathToVertexArrays(path);
-        fillVertexArray(path.fillRule());
-        return;
-    }
-
-    glMatrixMode(GL_MODELVIEW);
-    glLoadIdentity();
-
-    if (high_quality_antialiasing)
-        drawOffscreenPath(path);
-    else {
-        QPolygonF poly = path.toFillPolygon(matrix);
-        fillPolygon_dev(poly.data(), poly.count(),
-                        path.fillRule());
-    }
-
-    updateGLMatrix();
-}
-
-extern bool qt_isExtendedRadialGradient(const QBrush &brush);
-
-static inline bool needsEmulation(Qt::BrushStyle style)
-{
-    return !(style == Qt::SolidPattern
-             || (style == Qt::LinearGradientPattern
-                 && (QGLExtensions::glExtensions() & QGLExtensions::MirroredRepeat)));
-}
-
-void QOpenGLPaintEnginePrivate::updateUseEmulation()
-{
-    use_emulation = (!use_fragment_programs
-                     && ((has_pen && needsEmulation(pen_brush_style))
-                         || (has_brush && needsEmulation(brush_style))))
-                    || (has_pen && qt_isExtendedRadialGradient(cpen.brush()))
-                    || (has_brush && qt_isExtendedRadialGradient(cbrush));
-}
-
-void QOpenGLPaintEngine::updatePen(const QPen &pen)
-{
-    Q_D(QOpenGLPaintEngine);
-    Qt::PenStyle pen_style = pen.style();
-    d->pen_brush_style = pen.brush().style();
-    d->cpen = pen;
-    d->has_pen = (pen_style != Qt::NoPen) && (d->pen_brush_style != Qt::NoBrush);
-    d->updateUseEmulation();
-
-    if (pen.isCosmetic()) {
-        GLfloat width = pen.widthF() == 0.0f ? 1.0f : pen.widthF();
-        glLineWidth(width);
-        glPointSize(width);
-    }
-
-    if (d->pen_brush_style >= Qt::LinearGradientPattern
-        && d->pen_brush_style <= Qt::ConicalGradientPattern)
-    {
-        d->setGLPen(Qt::white);
-    } else {
-        d->setGLPen(pen.color());
-    }
-
-    d->updateFastPen();
-}
-
-void QOpenGLPaintEngine::updateBrush(const QBrush &brush, const QPointF &origin)
-{
-    Q_D(QOpenGLPaintEngine);
-    d->cbrush = brush;
-    d->brush_style = brush.style();
-    d->brush_origin = origin;
-    d->has_brush = (d->brush_style != Qt::NoBrush);
-    d->updateUseEmulation();
-}
-
-void QOpenGLPaintEngine::updateFont(const QFont &)
-{
-}
-
-void QOpenGLPaintEngine::updateMatrix(const QTransform &mtx)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    d->matrix = mtx;
-
-    d->mv_matrix[0][0] = mtx.m11();
-    d->mv_matrix[0][1] = mtx.m12();
-    d->mv_matrix[0][2] = 0;
-    d->mv_matrix[0][3] = mtx.m13();
-
-    d->mv_matrix[1][0] = mtx.m21();
-    d->mv_matrix[1][1] = mtx.m22();
-    d->mv_matrix[1][2] = 0;
-    d->mv_matrix[1][3] = mtx.m23();
-
-    d->mv_matrix[2][0] = 0;
-    d->mv_matrix[2][1] = 0;
-    d->mv_matrix[2][2] = 1;
-    d->mv_matrix[2][3] = 0;
-
-    d->mv_matrix[3][0] = mtx.dx();
-    d->mv_matrix[3][1] = mtx.dy();
-    d->mv_matrix[3][2] = 0;
-    d->mv_matrix[3][3] = mtx.m33();
-
-    d->txop = mtx.type();
-
-    // 1/10000 == 0.0001, so we have good enough res to cover curves
-    // that span the entire widget...
-    d->inverseScale = qMax(1 / qMax( qMax(qAbs(mtx.m11()), qAbs(mtx.m22())),
-                                     qMax(qAbs(mtx.m12()), qAbs(mtx.m21())) ),
-                           qreal(0.0001));
-
-    d->updateGLMatrix();
-    d->updateFastPen();
-}
-
-void QOpenGLPaintEnginePrivate::updateGLMatrix() const
-{
-    glMatrixMode(GL_MODELVIEW);
-#ifndef QT_OPENGL_ES
-    glLoadMatrixd(&mv_matrix[0][0]);
-#else
-    glLoadMatrixf(&mv_matrix[0][0]);
-#endif
-}
-
-void QOpenGLPaintEnginePrivate::disableClipping()
-{
-    glDisable(GL_DEPTH_TEST);
-    glDisable(GL_SCISSOR_TEST);
-}
-
-void QOpenGLPaintEnginePrivate::enableClipping()
-{
-    Q_Q(QOpenGLPaintEngine);
-    if (!q->state()->hasClipping)
-        return;
-
-    if (q->state()->fastClip.isEmpty())
-        glEnable(GL_DEPTH_TEST);
-    else
-        updateDepthClip(); // this will enable the scissor test
-}
-
-void QOpenGLPaintEnginePrivate::updateDepthClip()
-{
-    Q_Q(QOpenGLPaintEngine);
-
-    ++q->state()->depthClipId;
-
-    glDisable(GL_DEPTH_TEST);
-    glDisable(GL_SCISSOR_TEST);
-
-    if (!q->state()->hasClipping)
-        return;
-
-    QRect fastClip;
-    if (q->state()->clipEnabled) {
-        fastClip = q->state()->fastClip;
-    } else if (use_system_clip && q->systemClip().rects().count() == 1) {
-        fastClip = q->systemClip().rects().at(0);
-    }
-
-    if (!fastClip.isEmpty()) {
-        glEnable(GL_SCISSOR_TEST);
-
-        const int left = fastClip.left();
-        const int width = fastClip.width();
-        const int bottom = device->size().height() - (fastClip.bottom() + 1);
-        const int height = fastClip.height();
-
-        glScissor(left, bottom, width, height);
-        return;
-    }
-
-#if defined(QT_OPENGL_ES_1) || defined(QT_OPENGL_ES_2)
-    glClearDepthf(0.0f);
-#else
-    glClearDepth(0.0f);
-#endif
-
-    glEnable(GL_DEPTH_TEST);
-    glDepthMask(GL_TRUE);
-    glClear(GL_DEPTH_BUFFER_BIT);
-
-    glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
-    glDepthFunc(GL_ALWAYS);
-
-    const QVector<QRect> rects = q->state()->clipEnabled ? q->state()->clipRegion.rects() : q->systemClip().rects();
-
-    // rectangle count * 2 (triangles) * vertex count * component count (Z omitted)
-    QDataBuffer<GLfloat> clipVertex(rects.size()*2*3*2);
-    for (int i = 0; i < rects.size(); ++i) {
-        GLfloat x = GLfloat(rects.at(i).left());
-        GLfloat w = GLfloat(rects.at(i).width());
-        GLfloat h = GLfloat(rects.at(i).height());
-        GLfloat y = GLfloat(rects.at(i).top());
-
-        // First triangle
-        clipVertex.add(x);
-        clipVertex.add(y);
-
-        clipVertex.add(x);
-        clipVertex.add(y + h);
-
-        clipVertex.add(x + w);
-        clipVertex.add(y);
-
-        // Second triangle
-        clipVertex.add(x);
-        clipVertex.add(y + h);
-
-        clipVertex.add(x + w);
-        clipVertex.add(y + h);
-
-        clipVertex.add (x + w);
-        clipVertex.add(y);
-    }
-
-    if (rects.size()) {
-        glMatrixMode(GL_MODELVIEW);
-        glLoadIdentity();
-
-        glEnableClientState(GL_VERTEX_ARRAY);
-        glVertexPointer(2, GL_FLOAT, 0, clipVertex.data());
-
-        glDrawArrays(GL_TRIANGLES, 0, rects.size()*2*3);
-        glDisableClientState(GL_VERTEX_ARRAY);
-        updateGLMatrix();
-    }
-
-    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-    glDepthMask(GL_FALSE);
-    glDepthFunc(GL_LEQUAL);
-}
-
-void QOpenGLPaintEnginePrivate::systemStateChanged()
-{
-    Q_Q(QOpenGLPaintEngine);
-    if (q->painter()->hasClipping())
-        q->updateClipRegion(q->painter()->clipRegion(), Qt::ReplaceClip);
-    else
-        q->updateClipRegion(QRegion(), Qt::NoClip);
-}
-
-void QOpenGLPaintEngine::updateClipRegion(const QRegion &clipRegion, Qt::ClipOperation op)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    // clipping is only supported when a stencil or depth buffer is
-    // available
-    if (!d->device->format().depth())
-        return;
-
-    d->use_system_clip = false;
-    QRegion sysClip = systemClip();
-    if (!sysClip.isEmpty()) {
-        if (d->pdev->devType() != QInternal::Widget) {
-            d->use_system_clip = true;
-        } else {
-#ifndef Q_WS_QWS
-            // Only use the system clip if we're currently rendering a widget with a GL painter.
-            if (d->currentClipDevice) {
-                QWidgetPrivate *widgetPrivate = qt_widget_private(static_cast<QWidget *>(d->currentClipDevice)->window());
-                d->use_system_clip = widgetPrivate->extra && widgetPrivate->extra->inRenderWithPainter;
-            }
-#endif
-        }
-    }
-
-    d->flushDrawQueue();
-
-    if (op == Qt::NoClip && !d->use_system_clip) {
-        state()->hasClipping = false;
-        state()->clipRegion = QRegion();
-        d->updateDepthClip();
-        return;
-    }
-
-    bool isScreenClip = false;
-    if (!d->use_system_clip) {
-        QVector<QRect> untransformedRects = clipRegion.rects();
-
-        if (untransformedRects.size() == 1) {
-            QPainterPath path;
-            path.addRect(untransformedRects[0]);
-            path = d->matrix.map(path);
-
-            if (path.contains(QRectF(QPointF(), d->device->size())))
-                isScreenClip = true;
-        }
-    }
-
-    QRegion region = isScreenClip ? QRegion() : clipRegion * d->matrix;
-    switch (op) {
-    case Qt::NoClip:
-        if (!d->use_system_clip)
-            break;
-        state()->clipRegion = sysClip;
-        break;
-    case Qt::IntersectClip:
-        if (isScreenClip)
-            return;
-        if (state()->hasClipping) {
-            state()->clipRegion &= region;
-            break;
-        }
-        // fall through
-    case Qt::ReplaceClip:
-        if (d->use_system_clip)
-            state()->clipRegion = region & sysClip;
-        else
-            state()->clipRegion = region;
-        break;
-    default:
-        break;
-    }
-
-    if (isScreenClip) {
-        state()->hasClipping = false;
-        state()->clipRegion = QRegion();
-    } else {
-        state()->hasClipping = op != Qt::NoClip || d->use_system_clip;
-    }
-
-    if (state()->hasClipping && state()->clipRegion.rects().size() == 1)
-        state()->fastClip = state()->clipRegion.rects().at(0);
-    else
-        state()->fastClip = QRect();
-
-    d->updateDepthClip();
-}
-
-void QOpenGLPaintEngine::updateRenderHints(QPainter::RenderHints hints)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    d->flushDrawQueue();
-    d->use_smooth_pixmap_transform = bool(hints & QPainter::SmoothPixmapTransform);
-    if ((hints & QPainter::Antialiasing) || (hints & QPainter::HighQualityAntialiasing)) {
-        if (d->use_fragment_programs && QGLOffscreen::isSupported()
-            && (hints & QPainter::HighQualityAntialiasing)) {
-            d->high_quality_antialiasing = true;
-        } else {
-            d->high_quality_antialiasing = false;
-            if (QGLExtensions::glExtensions() & QGLExtensions::SampleBuffers)
-                glEnable(GL_MULTISAMPLE);
-        }
-    } else {
-        d->high_quality_antialiasing = false;
-        if (QGLExtensions::glExtensions() & QGLExtensions::SampleBuffers)
-            glDisable(GL_MULTISAMPLE);
-    }
-
-    if (d->high_quality_antialiasing) {
-        d->offscreen.initialize();
-
-        if (!d->offscreen.isValid()) {
-            DEBUG_ONCE_STR("Unable to initialize offscreen, disabling high quality antialiasing");
-            d->high_quality_antialiasing = false;
-            if (QGLExtensions::glExtensions() & QGLExtensions::SampleBuffers)
-                glEnable(GL_MULTISAMPLE);
-        }
-    }
-
-    d->has_antialiasing = d->high_quality_antialiasing
-                          || ((hints & QPainter::Antialiasing)
-                              && (QGLExtensions::glExtensions() & QGLExtensions::SampleBuffers));
-}
-
-
-void QOpenGLPaintEnginePrivate::setPorterDuffData(float a, float b, float x, float y, float z)
-{
-    porterduff_ab_data[0] = a;
-    porterduff_ab_data[1] = b;
-
-    porterduff_xyz_data[0] = x;
-    porterduff_xyz_data[1] = y;
-    porterduff_xyz_data[2] = z;
-}
-
-
-void QOpenGLPaintEngine::updateCompositionMode(QPainter::CompositionMode composition_mode)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    if (!d->use_fragment_programs && composition_mode > QPainter::CompositionMode_Plus)
-        composition_mode = QPainter::CompositionMode_SourceOver;
-
-    d->composition_mode = composition_mode;
-
-    d->has_fast_composition_mode = (!d->high_quality_antialiasing && composition_mode <= QPainter::CompositionMode_Plus)
-                                   || composition_mode == QPainter::CompositionMode_SourceOver
-                                   || composition_mode == QPainter::CompositionMode_Destination
-                                   || composition_mode == QPainter::CompositionMode_DestinationOver
-                                   || composition_mode == QPainter::CompositionMode_DestinationOut
-                                   || composition_mode == QPainter::CompositionMode_SourceAtop
-                                   || composition_mode == QPainter::CompositionMode_Xor
-                                   || composition_mode == QPainter::CompositionMode_Plus;
-
-    if (d->has_fast_composition_mode)
-        d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODE_BLEND_MODE_MASK : COMPOSITION_MODE_BLEND_MODE_NOMASK;
-    else if (composition_mode <= QPainter::CompositionMode_Plus)
-        d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_SIMPLE_PORTER_DUFF : COMPOSITION_MODES_SIMPLE_PORTER_DUFF_NOMASK;
-    else
-        switch (composition_mode) {
-        case QPainter::CompositionMode_Multiply:
-            d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_MULTIPLY : COMPOSITION_MODES_MULTIPLY_NOMASK;
-            break;
-        case QPainter::CompositionMode_Screen:
-            d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_SCREEN : COMPOSITION_MODES_SCREEN_NOMASK;
-            break;
-        case QPainter::CompositionMode_Overlay:
-            d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_OVERLAY : COMPOSITION_MODES_OVERLAY_NOMASK;
-            break;
-        case QPainter::CompositionMode_Darken:
-            d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_DARKEN : COMPOSITION_MODES_DARKEN_NOMASK;
-            break;
-        case QPainter::CompositionMode_Lighten:
-            d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_LIGHTEN : COMPOSITION_MODES_LIGHTEN_NOMASK;
-            break;
-        case QPainter::CompositionMode_ColorDodge:
-            d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_COLORDODGE : COMPOSITION_MODES_COLORDODGE_NOMASK;
-            break;
-        case QPainter::CompositionMode_ColorBurn:
-            d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_COLORBURN : COMPOSITION_MODES_COLORBURN_NOMASK;
-            break;
-        case QPainter::CompositionMode_HardLight:
-            d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_HARDLIGHT : COMPOSITION_MODES_HARDLIGHT_NOMASK;
-            break;
-        case QPainter::CompositionMode_SoftLight:
-            d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_SOFTLIGHT : COMPOSITION_MODES_SOFTLIGHT_NOMASK;
-            break;
-        case QPainter::CompositionMode_Difference:
-            d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_DIFFERENCE : COMPOSITION_MODES_DIFFERENCE_NOMASK;
-            break;
-        case QPainter::CompositionMode_Exclusion:
-            d->fragment_composition_mode = d->high_quality_antialiasing ? COMPOSITION_MODES_EXCLUSION : COMPOSITION_MODES_EXCLUSION_NOMASK;
-            break;
-        default:
-            Q_ASSERT(false);
-        }
-
-    switch(composition_mode) {
-    case QPainter::CompositionMode_DestinationOver:
-        glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ONE);
-        d->setPorterDuffData(0, 1, 1, 1, 1);
-        break;
-    case QPainter::CompositionMode_Clear:
-        glBlendFunc(GL_ZERO, GL_ZERO);
-        d->setPorterDuffData(0, 0, 0, 0, 0);
-        break;
-    case QPainter::CompositionMode_Source:
-        glBlendFunc(GL_ONE, GL_ZERO);
-        d->setPorterDuffData(1, 0, 1, 1, 0);
-        break;
-    case QPainter::CompositionMode_Destination:
-        glBlendFunc(GL_ZERO, GL_ONE);
-        d->setPorterDuffData(0, 1, 1, 0, 1);
-        break;
-    case QPainter::CompositionMode_SourceIn:
-        glBlendFunc(GL_DST_ALPHA, GL_ZERO);
-        d->setPorterDuffData(1, 0, 1, 0, 0);
-        break;
-    case QPainter::CompositionMode_DestinationIn:
-        glBlendFunc(GL_ZERO, GL_SRC_ALPHA);
-        d->setPorterDuffData(0, 1, 1, 0, 0);
-        break;
-    case QPainter::CompositionMode_SourceOut:
-        glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ZERO);
-        d->setPorterDuffData(0, 0, 0, 1, 0);
-        break;
-    case QPainter::CompositionMode_DestinationOut:
-        glBlendFunc(GL_ZERO, GL_ONE_MINUS_SRC_ALPHA);
-        d->setPorterDuffData(0, 0, 0, 0, 1);
-        break;
-    case QPainter::CompositionMode_SourceAtop:
-        glBlendFunc(GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-        d->setPorterDuffData(1, 0, 1, 0, 1);
-        break;
-    case QPainter::CompositionMode_DestinationAtop:
-        glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA);
-        d->setPorterDuffData(0, 1, 1, 1, 0);
-        break;
-    case QPainter::CompositionMode_Xor:
-        glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-        d->setPorterDuffData(0, 0, 0, 1, 1);
-        break;
-    case QPainter::CompositionMode_SourceOver:
-        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
-        d->setPorterDuffData(1, 0, 1, 1, 1);
-        break;
-    case QPainter::CompositionMode_Plus:
-        glBlendFunc(GL_ONE, GL_ONE);
-        d->setPorterDuffData(1, 1, 1, 1, 1);
-        break;
-    default:
-        break;
-    }
-}
-
-class QGLMaskGenerator
-{
-public:
-    QGLMaskGenerator(const QPainterPath &path, const QTransform &matrix, qreal stroke_width = -1)
-        : p(path),
-          m(matrix),
-          w(stroke_width)
-    {
-    }
-
-    virtual QRect screenRect() = 0;
-    virtual void drawMask(const QRect &rect) = 0;
-
-    QPainterPath path() const { return p; }
-    QTransform matrix() const { return m; }
-    qreal strokeWidth() const { return w; }
-
-    virtual ~QGLMaskGenerator() {}
-
-private:
-    QPainterPath p;
-    QTransform m;
-    qreal w;
-};
-
-void QGLMaskTextureCache::setOffscreenSize(const QSize &sz)
-{
-    Q_ASSERT(sz.width() == sz.height());
-
-    if (offscreenSize != sz) {
-        offscreenSize = sz;
-        clearCache();
-    }
-}
-
-void QGLMaskTextureCache::clearCache()
-{
-    cache.clear();
-
-    int quad_tree_size = 1;
-
-    for (int i = block_size; i < offscreenSize.width(); i *= 2)
-        quad_tree_size += quad_tree_size * 4;
-
-    for (int i = 0; i < 4; ++i) {
-        occupied_quadtree[i].resize(quad_tree_size);
-
-        occupied_quadtree[i][0].key = 0;
-        occupied_quadtree[i][0].largest_available_block = offscreenSize.width();
-        occupied_quadtree[i][0].largest_used_block = 0;
-
-        DEBUG_ONCE qDebug() << "QGLMaskTextureCache:: created quad tree of size" << quad_tree_size;
-    }
-}
-
-void QGLMaskTextureCache::setDrawableSize(const QSize &sz)
-{
-    drawableSize = sz;
-}
-
-void QGLMaskTextureCache::maintainCache()
-{
-    QGLTextureCacheHash::iterator it = cache.begin();
-    QGLTextureCacheHash::iterator end = cache.end();
-
-    while (it != end) {
-        CacheInfo &cache_info = it.value();
-        ++cache_info.age;
-
-        if (cache_info.age > 1) {
-            quadtreeInsert(cache_info.loc.channel, 0, cache_info.loc.rect);
-            it = cache.erase(it);
-        } else {
-            ++it;
-        }
-    }
-}
-
-//#define DISABLE_MASK_CACHE
-
-QGLMaskTextureCache::CacheLocation QGLMaskTextureCache::getMask(QGLMaskGenerator &maskGenerator, QOpenGLPaintEnginePrivate *e)
-{
-#ifndef DISABLE_MASK_CACHE
-    engine = e;
-
-    quint64 key = hash(maskGenerator.path(), maskGenerator.matrix(), maskGenerator.strokeWidth());
-
-    if (key == 0)
-        key = 1;
-
-    CacheInfo info(maskGenerator.path(), maskGenerator.matrix(), maskGenerator.strokeWidth());
-
-    QGLTextureCacheHash::iterator it = cache.find(key);
-
-    while (it != cache.end() && it.key() == key) {
-        CacheInfo &cache_info = it.value();
-        if (info.stroke_width == cache_info.stroke_width && info.matrix == cache_info.matrix && info.path == cache_info.path) {
-            DEBUG_ONCE_STR("QGLMaskTextureCache::getMask(): Using cached mask");
-
-            cache_info.age = 0;
-            return cache_info.loc;
-        }
-        ++it;
-    }
-
-    // mask was not found, create new mask
-
-    DEBUG_ONCE_STR("QGLMaskTextureCache::getMask(): Creating new mask...");
-
-    createMask(key, info, maskGenerator);
-
-    cache.insert(key, info);
-
-    return info.loc;
-#else
-    CacheInfo info(maskGenerator.path(), maskGenerator.matrix());
-    createMask(0, info, maskGenerator);
-    return info.loc;
-#endif
-}
-
-#ifndef FloatToQuint64
-#define FloatToQuint64(i) (quint64)((i) * 32)
-#endif
-
-quint64 QGLMaskTextureCache::hash(const QPainterPath &p, const QTransform &m, qreal w)
-{
-    Q_ASSERT(sizeof(quint64) == 8);
-
-    quint64 h = 0;
-
-    for (int i = 0; i < p.elementCount(); ++i) {
-        h += FloatToQuint64(p.elementAt(i).x) << 32;
-        h += FloatToQuint64(p.elementAt(i).y);
-        h += p.elementAt(i).type;
-    }
-
-    h += FloatToQuint64(m.m11());
-#ifndef Q_OS_WINCE    //  ###
-    //Compiler crashes for arm on WinCE
-    h += FloatToQuint64(m.m12()) << 4;
-    h += FloatToQuint64(m.m13()) << 8;
-    h += FloatToQuint64(m.m21()) << 12;
-    h += FloatToQuint64(m.m22()) << 16;
-    h += FloatToQuint64(m.m23()) << 20;
-    h += FloatToQuint64(m.m31()) << 24;
-    h += FloatToQuint64(m.m32()) << 28;
-#endif
-    h += FloatToQuint64(m.m33()) << 32;
-
-    h += FloatToQuint64(w);
-
-    return h;
-}
-
-void QGLMaskTextureCache::createMask(quint64 key, CacheInfo &info, QGLMaskGenerator &maskGenerator)
-{
-    info.loc.screen_rect = maskGenerator.screenRect();
-
-    if (info.loc.screen_rect.isEmpty()) {
-        info.loc.channel = 0;
-        info.loc.rect = QRect();
-        return;
-    }
-
-    quadtreeAllocate(key, info.loc.screen_rect.size(), &info.loc.rect, &info.loc.channel);
-
-    int ch = info.loc.channel;
-    glColorMask(ch == 0, ch == 1, ch == 2, ch == 3);
-
-    maskGenerator.drawMask(info.loc.rect);
-
-    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-}
-
-int QGLMaskTextureCache::quadtreeBlocksize(int node)
-{
-    DEBUG_ONCE qDebug() << "Offscreen size:" << offscreenSize.width();
-
-    int blocksize = offscreenSize.width();
-
-    while (node) {
-        node = (node - 1) / 4;
-        blocksize /= 2;
-    }
-
-    return blocksize;
-}
-
-QPoint QGLMaskTextureCache::quadtreeLocation(int node)
-{
-    QPoint location;
-    int blocksize = quadtreeBlocksize(node);
-
-    while (node) {
-        --node;
-
-        if (node & 1)
-            location.setX(location.x() + blocksize);
-
-        if (node & 2)
-            location.setY(location.y() + blocksize);
-
-        node /= 4;
-        blocksize *= 2;
-    }
-
-    return location;
-}
-
-void QGLMaskTextureCache::quadtreeUpdate(int channel, int node, int current_block_size)
-{
-    while (node) {
-        node = (node - 1) / 4;
-
-        int first_child = node * 4 + 1;
-
-        int largest_available = 0;
-        int largest_used = 0;
-
-        bool all_empty = true;
-
-        for (int i = 0; i < 4; ++i) {
-            largest_available = qMax(largest_available, occupied_quadtree[channel][first_child + i].largest_available_block);
-            largest_used = qMax(largest_used, occupied_quadtree[channel][first_child + i].largest_used_block);
-
-            if (occupied_quadtree[channel][first_child + i].largest_available_block < current_block_size)
-                all_empty = false;
-        }
-
-        current_block_size *= 2;
-
-        if (all_empty) {
-            occupied_quadtree[channel][node].largest_available_block = current_block_size;
-            occupied_quadtree[channel][node].largest_used_block = 0;
-        } else {
-            occupied_quadtree[channel][node].largest_available_block = largest_available;
-            occupied_quadtree[channel][node].largest_used_block = largest_used;
-        }
-    }
-}
-
-void QGLMaskTextureCache::quadtreeInsert(int channel, quint64 key, const QRect &rect, int node)
-{
-    int current_block_size = quadtreeBlocksize(node);
-    QPoint location = quadtreeLocation(node);
-    QRect relative = rect.translated(-location);
-
-    if (relative.left() >= current_block_size || relative.top() >= current_block_size
-        || relative.right() < 0 || relative.bottom() < 0)
-        return;
-
-    if (current_block_size == block_size // no more refining possible
-        || (relative.top() < block_size && relative.bottom() >= (current_block_size - block_size)
-            && relative.left() < block_size && relative.right() >= (current_block_size - block_size)))
-    {
-        if (key != 0) {
-            occupied_quadtree[channel][node].largest_available_block = 0;
-            occupied_quadtree[channel][node].largest_used_block = rect.width() * rect.height();
-        } else {
-            occupied_quadtree[channel][node].largest_available_block = current_block_size;
-            occupied_quadtree[channel][node].largest_used_block = 0;
-        }
-
-        occupied_quadtree[channel][node].key = key;
-
-        quadtreeUpdate(channel, node, current_block_size);
-    } else {
-        if (key && occupied_quadtree[channel][node].largest_available_block == current_block_size) {
-            // refining the quad tree, initialize child nodes
-            int half_block_size = current_block_size / 2;
-
-            int temp = node * 4 + 1;
-            for (int sibling = 0; sibling < 4; ++sibling) {
-                occupied_quadtree[channel][temp + sibling].largest_available_block = half_block_size;
-                occupied_quadtree[channel][temp + sibling].largest_used_block = 0;
-                occupied_quadtree[channel][temp + sibling].key = 0;
-            }
-        }
-
-        node = node * 4 + 1;
-
-        for (int sibling = 0; sibling < 4; ++sibling)
-            quadtreeInsert(channel, key, rect, node + sibling);
-    }
-}
-
-void QGLMaskTextureCache::quadtreeClear(int channel, const QRect &rect, int node)
-{
-    const quint64 &key = occupied_quadtree[channel][node].key;
-
-    int current_block_size = quadtreeBlocksize(node);
-    QPoint location = quadtreeLocation(node);
-
-    QRect relative = rect.translated(-location);
-
-    if (relative.left() >= current_block_size || relative.top() >= current_block_size
-        || relative.right() < 0 || relative.bottom() < 0)
-        return;
-
-    if (key != 0) {
-        QGLTextureCacheHash::iterator it = cache.find(key);
-
-        Q_ASSERT(it != cache.end());
-
-        while (it != cache.end() && it.key() == key) {
-            const CacheInfo &cache_info = it.value();
-
-            if (cache_info.loc.channel == channel
-                && cache_info.loc.rect.left() <= location.x()
-                && cache_info.loc.rect.top() <= location.y()
-                && cache_info.loc.rect.right() >= location.x()
-                && cache_info.loc.rect.bottom() >= location.y())
-            {
-                quadtreeInsert(channel, 0, cache_info.loc.rect);
-                engine->cacheItemErased(channel, cache_info.loc.rect);
-                cache.erase(it);
-                goto found;
-            } else {
-                ++it;
-            }
-        }
-
-        // if we don't find the key there's an error in the quadtree
-        Q_ASSERT(false);
-found:
-        Q_ASSERT(occupied_quadtree[channel][node].key == 0);
-    } else if (occupied_quadtree[channel][node].largest_available_block < current_block_size) {
-        Q_ASSERT(current_block_size >= block_size);
-
-        node = node * 4 + 1;
-
-        for (int sibling = 0; sibling < 4; ++sibling)
-            quadtreeClear(channel, rect, node + sibling);
-    }
-}
-
-bool QGLMaskTextureCache::quadtreeFindAvailableLocation(const QSize &size, QRect *rect, int *channel)
-{
-    int needed_block_size = qMax(1, qMax(size.width(), size.height()));
-
-    for (int i = 0; i < 4; ++i) {
-        int current_block_size = offscreenSize.width();
-
-        if (occupied_quadtree[i][0].largest_available_block >= needed_block_size) {
-            int node = 0;
-
-            while (current_block_size != occupied_quadtree[i][node].largest_available_block) {
-                Q_ASSERT(current_block_size > block_size);
-                Q_ASSERT(current_block_size > occupied_quadtree[i][node].largest_available_block);
-
-                node = node * 4 + 1;
-                current_block_size /= 2;
-
-                int sibling = 0;
-
-                while (occupied_quadtree[i][node + sibling].largest_available_block < needed_block_size)
-                    ++sibling;
-
-                Q_ASSERT(sibling < 4);
-                node += sibling;
-            }
-
-            *channel = i;
-            *rect = QRect(quadtreeLocation(node), size);
-
-            return true;
-        }
-    }
-
-    return false;
-}
-
-void QGLMaskTextureCache::quadtreeFindExistingLocation(const QSize &size, QRect *rect, int *channel)
-{
-    // try to pick small masks to throw out, as large masks are more expensive to recompute
-    *channel = qrand() % 4;
-    for (int i = 0; i < 4; ++i)
-        if (occupied_quadtree[i][0].largest_used_block < occupied_quadtree[*channel][0].largest_used_block)
-            *channel = i;
-
-    int needed_block_size = qt_next_power_of_two(qMax(1, qMax(size.width(), size.height())));
-
-    int node = 0;
-    int current_block_size = offscreenSize.width();
-
-    while (current_block_size > block_size
-           && current_block_size >= needed_block_size * 2
-           && occupied_quadtree[*channel][node].key == 0)
-    {
-        node = node * 4 + 1;
-
-        int sibling = 0;
-
-        for (int i = 1; i < 4; ++i) {
-            if (occupied_quadtree[*channel][node + i].largest_used_block
-                <= occupied_quadtree[*channel][node + sibling].largest_used_block)
-            {
-                sibling = i;
-            }
-        }
-
-        node += sibling;
-        current_block_size /= 2;
-    }
-
-    *rect = QRect(quadtreeLocation(node), size);
-}
-
-void QGLMaskTextureCache::quadtreeAllocate(quint64 key, const QSize &size, QRect *rect, int *channel)
-{
-#ifndef DISABLE_MASK_CACHE
-    if (!quadtreeFindAvailableLocation(size, rect, channel)) {
-        quadtreeFindExistingLocation(size, rect, channel);
-        quadtreeClear(*channel, *rect);
-    }
-
-    quadtreeInsert(*channel, key, *rect);
-#else
-    *channel = 0;
-    *rect = QRect(QPoint(), size);
-#endif
-}
-
-class QGLTrapezoidMaskGenerator : public QGLMaskGenerator
-{
-public:
-    QGLTrapezoidMaskGenerator(const QPainterPath &path, const QTransform &matrix, QGLOffscreen &offscreen, GLuint maskFragmentProgram, qreal strokeWidth = -1.0);
-
-    QRect screenRect();
-    void drawMask(const QRect &rect);
-
-private:
-    QRect screen_rect;
-    bool has_screen_rect;
-
-    QGLOffscreen *offscreen;
-
-    GLuint maskFragmentProgram;
-
-    virtual QVector<QGLTrapezoid> generateTrapezoids() = 0;
-    virtual QRect computeScreenRect() = 0;
-};
-
-class QGLPathMaskGenerator : public QGLTrapezoidMaskGenerator
-{
-public:
-    QGLPathMaskGenerator(const QPainterPath &path, const QTransform &matrix, QGLOffscreen &offscreen, GLuint maskFragmentProgram);
-
-private:
-    QVector<QGLTrapezoid> generateTrapezoids();
-    QRect computeScreenRect();
-
-    QPolygonF poly;
-};
-
-class QGLLineMaskGenerator : public QGLTrapezoidMaskGenerator
-{
-public:
-    QGLLineMaskGenerator(const QPainterPath &path, const QTransform &matrix, qreal width, QGLOffscreen &offscreen, GLuint maskFragmentProgram);
-
-private:
-    QVector<QGLTrapezoid> generateTrapezoids();
-    QRect computeScreenRect();
-
-    QPainterPath transformedPath;
-};
-
-class QGLRectMaskGenerator : public QGLTrapezoidMaskGenerator
-{
-public:
-    QGLRectMaskGenerator(const QPainterPath &path, const QTransform &matrix, QGLOffscreen &offscreen, GLuint maskFragmentProgram);
-
-private:
-    QVector<QGLTrapezoid> generateTrapezoids();
-    QRect computeScreenRect();
-
-    QPainterPath transformedPath;
-};
-
-class QGLEllipseMaskGenerator : public QGLMaskGenerator
-{
-public:
-    QGLEllipseMaskGenerator(const QRectF &rect, const QTransform &matrix, QGLOffscreen &offscreen, GLuint maskFragmentProgram, int *maskVariableLocations);
-
-    QRect screenRect();
-    void drawMask(const QRect &rect);
-
-private:
-    QRect screen_rect;
-
-    QRectF ellipseRect;
-
-    QGLOffscreen *offscreen;
-
-    GLuint maskFragmentProgram;
-
-    int *maskVariableLocations;
-
-    float vertexArray[4 * 2];
-};
-
-QGLTrapezoidMaskGenerator::QGLTrapezoidMaskGenerator(const QPainterPath &path, const QTransform &matrix, QGLOffscreen &offs, GLuint program, qreal stroke_width)
-    : QGLMaskGenerator(path, matrix, stroke_width)
-    ,  has_screen_rect(false)
-    ,  offscreen(&offs)
-    ,  maskFragmentProgram(program)
-{
-}
-
-extern void qt_add_rect_to_array(const QRectF &r, GLfloat *array);
-extern void qt_add_texcoords_to_array(qreal x1, qreal y1, qreal x2, qreal y2, GLfloat *array);
-
-void QGLTrapezoidMaskGenerator::drawMask(const QRect &rect)
-{
-#ifdef QT_OPENGL_ES
-    Q_UNUSED(rect);
-#else
-    glMatrixMode(GL_MODELVIEW);
-    glPushMatrix();
-    glLoadIdentity();
-
-    QGLContext *ctx = offscreen->context();
-    offscreen->bind();
-
-    glDisable(GL_TEXTURE_GEN_S);
-    glDisable(GL_TEXTURE_1D);
-
-    GLfloat vertexArray[4 * 2];
-    qt_add_rect_to_array(rect, vertexArray);
-
-    bool needs_scissor = rect != screen_rect;
-
-    if (needs_scissor) {
-        glEnable(GL_SCISSOR_TEST);
-        glScissor(rect.left(), offscreen->offscreenSize().height() - rect.bottom() - 1, rect.width(), rect.height());
-    }
-
-    QVector<QGLTrapezoid> trapezoids = generateTrapezoids();
-
-    // clear mask
-    glBlendFunc(GL_ZERO, GL_ZERO); // clear
-    glVertexPointer(2, GL_FLOAT, 0, vertexArray);
-    glEnableClientState(GL_VERTEX_ARRAY);
-    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-    glDisableClientState(GL_VERTEX_ARRAY);
-
-    glBlendFunc(GL_ONE, GL_ONE); // add mask
-    glEnable(GL_FRAGMENT_PROGRAM_ARB);
-    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, maskFragmentProgram);
-
-    QPoint delta = rect.topLeft() - screen_rect.topLeft();
-    glBegin(GL_QUADS);
-    for (int i = 0; i < trapezoids.size(); ++i)
-        drawTrapezoid(trapezoids[i].translated(delta), offscreen->offscreenSize().height(), ctx);
-    glEnd();
-
-    if (needs_scissor)
-        glDisable(GL_SCISSOR_TEST);
-
-    glDisable(GL_FRAGMENT_PROGRAM_ARB);
-
-    glMatrixMode(GL_MODELVIEW);
-    glPopMatrix();
-#endif
-}
-
-QRect QGLTrapezoidMaskGenerator::screenRect()
-{
-    if (!has_screen_rect) {
-        screen_rect = computeScreenRect();
-        has_screen_rect = true;
-    }
-
-    screen_rect = screen_rect.intersected(QRect(QPoint(), offscreen->drawableSize()));
-
-    return screen_rect;
-}
-
-QGLPathMaskGenerator::QGLPathMaskGenerator(const QPainterPath &path, const QTransform &matrix, QGLOffscreen &offs, GLuint program)
-    : QGLTrapezoidMaskGenerator(path, matrix, offs, program)
-{
-}
-
-QRect QGLPathMaskGenerator::computeScreenRect()
-{
-    poly = path().toFillPolygon(matrix());
-    return poly.boundingRect().toAlignedRect();
-}
-
-QVector<QGLTrapezoid> QGLPathMaskGenerator::generateTrapezoids()
-{
-    QOpenGLImmediateModeTessellator tessellator;
-    tessellator.tessellate(poly.data(), poly.count(), path().fillRule() == Qt::WindingFill);
-    return tessellator.trapezoids;
-}
-
-QGLRectMaskGenerator::QGLRectMaskGenerator(const QPainterPath &path, const QTransform &matrix, QGLOffscreen &offs, GLuint program)
-    : QGLTrapezoidMaskGenerator(path, matrix, offs, program)
-{
-}
-
-QGLLineMaskGenerator::QGLLineMaskGenerator(const QPainterPath &path, const QTransform &matrix, qreal width, QGLOffscreen &offs, GLuint program)
-    : QGLTrapezoidMaskGenerator(path, matrix, offs, program, width)
-{
-}
-
-QRect QGLRectMaskGenerator::computeScreenRect()
-{
-    transformedPath = matrix().map(path());
-
-    return transformedPath.controlPointRect().adjusted(-1, -1, 1, 1).toAlignedRect();
-}
-
-QRect QGLLineMaskGenerator::computeScreenRect()
-{
-    transformedPath = matrix().map(path());
-
-    return transformedPath.controlPointRect().adjusted(-1, -1, 1, 1).toAlignedRect();
-}
-
-QVector<QGLTrapezoid> QGLLineMaskGenerator::generateTrapezoids()
-{
-    QOpenGLImmediateModeTessellator tessellator;
-    QPointF last;
-    for (int i = 0; i < transformedPath.elementCount(); ++i) {
-        QPainterPath::Element element = transformedPath.elementAt(i);
-
-        Q_ASSERT(!element.isCurveTo());
-
-        if (element.isLineTo())
-            tessellator.tessellateRect(last, element, strokeWidth());
-
-        last = element;
-    }
-
-    return tessellator.trapezoids;
-}
-
-QVector<QGLTrapezoid> QGLRectMaskGenerator::generateTrapezoids()
-{
-    Q_ASSERT(transformedPath.elementCount() == 5);
-
-    QOpenGLImmediateModeTessellator tessellator;
-    if (matrix().type() <= QTransform::TxScale) {
-        QPointF a = transformedPath.elementAt(0);
-        QPointF b = transformedPath.elementAt(1);
-        QPointF c = transformedPath.elementAt(2);
-        QPointF d = transformedPath.elementAt(3);
-
-        QPointF first = (a + d) * 0.5;
-        QPointF last = (b + c) * 0.5;
-
-        QPointF delta = a - d;
-
-        // manhattan distance (no rotation)
-        qreal width = qAbs(delta.x()) + qAbs(delta.y());
-
-        Q_ASSERT(qFuzzyIsNull(delta.x()) || qFuzzyIsNull(delta.y()));
-
-        tessellator.tessellateRect(first, last, width);
-    } else {
-        QPointF points[5];
-
-        for (int i = 0; i < 5; ++i)
-            points[i] = transformedPath.elementAt(i);
-
-        tessellator.tessellateConvex(points, 5);
-    }
-    return tessellator.trapezoids;
-}
-
-static QPainterPath ellipseRectToPath(const QRectF &rect)
-{
-    QPainterPath path;
-    path.addEllipse(rect);
-    return path;
-}
-
-QGLEllipseMaskGenerator::QGLEllipseMaskGenerator(const QRectF &rect, const QTransform &matrix, QGLOffscreen &offs, GLuint program, int *locations)
-    : QGLMaskGenerator(ellipseRectToPath(rect), matrix),
-      ellipseRect(rect),
-      offscreen(&offs),
-      maskFragmentProgram(program),
-      maskVariableLocations(locations)
-{
-}
-
-QRect QGLEllipseMaskGenerator::screenRect()
-{
-    QPointF center = ellipseRect.center();
-
-    QPointF points[] = {
-        QPointF(ellipseRect.left(), center.y()),
-        QPointF(ellipseRect.right(), center.y()),
-        QPointF(center.x(), ellipseRect.top()),
-        QPointF(center.x(), ellipseRect.bottom())
-    };
-
-    qreal min_screen_delta_len = QREAL_MAX;
-
-    for (int i = 0; i < 4; ++i) {
-        QPointF delta = points[i] - center;
-
-        // normalize
-        delta /= qSqrt(delta.x() * delta.x() + delta.y() * delta.y());
-
-        QPointF screen_delta(matrix().m11() * delta.x() + matrix().m21() * delta.y(),
-                             matrix().m12() * delta.x() + matrix().m22() * delta.y());
-
-        min_screen_delta_len = qMin(min_screen_delta_len,
-                                    qreal(qSqrt(screen_delta.x() * screen_delta.x() + screen_delta.y() * screen_delta.y())));
-    }
-
-    const qreal padding = 2.0f;
-
-    qreal grow = padding / min_screen_delta_len;
-
-    QRectF boundingRect = ellipseRect.adjusted(-grow, -grow, grow, grow);
-
-    boundingRect = matrix().mapRect(boundingRect);
-
-    QPointF p(0.5, 0.5);
-
-    screen_rect = QRect((boundingRect.topLeft() - p).toPoint(),
-                        (boundingRect.bottomRight() + p).toPoint());
-
-    return screen_rect;
-}
-
-void QGLEllipseMaskGenerator::drawMask(const QRect &rect)
-{
-#ifdef QT_OPENGL_ES
-    Q_UNUSED(rect);
-#else
-    QGLContext *ctx = offscreen->context();
-    offscreen->bind();
-
-    glDisable(GL_TEXTURE_GEN_S);
-    glDisable(GL_TEXTURE_1D);
-
-    // fragment program needs the inverse radii of the ellipse
-    glTexCoord2f(1.0f / (ellipseRect.width() * 0.5f),
-                 1.0f / (ellipseRect.height() * 0.5f));
-
-    QTransform translate(1, 0, 0, 1, -ellipseRect.center().x(), -ellipseRect.center().y());
-    QTransform gl_to_qt(1, 0, 0, -1, 0, offscreen->drawableSize().height());
-    QTransform inv_matrix = gl_to_qt * matrix().inverted() * translate;
-
-    float m[3][4] = { { float(inv_matrix.m11()), float(inv_matrix.m12()), float(inv_matrix.m13()) },
-                      { float(inv_matrix.m21()), float(inv_matrix.m22()), float(inv_matrix.m23()) },
-                      { float(inv_matrix.m31()), float(inv_matrix.m32()), float(inv_matrix.m33()) } };
-
-    QPoint offs(screen_rect.left() - rect.left(), (offscreen->drawableSize().height() - screen_rect.top())
-                                                - (offscreen->offscreenSize().height() - rect.top()));
-
-    // last component needs to be 1.0f to avoid Nvidia bug on linux
-    float ellipse_offset[4] = { float(offs.x()), float(offs.y()), 0.0f, 1.0f };
-
-    GLfloat vertexArray[4 * 2];
-    qt_add_rect_to_array(rect, vertexArray);
-
-    glBlendFunc(GL_ONE, GL_ZERO); // set mask
-    glEnable(GL_FRAGMENT_PROGRAM_ARB);
-    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, maskFragmentProgram);
-
-    glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, maskVariableLocations[VAR_INV_MATRIX_M0], m[0]);
-    glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, maskVariableLocations[VAR_INV_MATRIX_M1], m[1]);
-    glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, maskVariableLocations[VAR_INV_MATRIX_M2], m[2]);
-
-    glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, maskVariableLocations[VAR_ELLIPSE_OFFSET], ellipse_offset);
-
-    glEnableClientState(GL_VERTEX_ARRAY);
-    glVertexPointer(2, GL_FLOAT, 0, vertexArray);
-    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-    glDisableClientState(GL_VERTEX_ARRAY);
-    glDisable(GL_FRAGMENT_PROGRAM_ARB);
-#endif
-}
-
-void QOpenGLPaintEnginePrivate::drawOffscreenPath(const QPainterPath &path)
-{
-#ifdef Q_WS_QWS
-    Q_UNUSED(path);
-#else
-    DEBUG_ONCE_STR("QOpenGLPaintEnginePrivate::drawOffscreenPath()");
-
-    disableClipping();
-
-    GLuint program = qt_gl_program_cache()->getProgram(device->context(),
-                                                       FRAGMENT_PROGRAM_MASK_TRAPEZOID_AA, 0, true);
-    QGLPathMaskGenerator maskGenerator(path, matrix, offscreen, program);
-    addItem(qt_mask_texture_cache()->getMask(maskGenerator, this));
-
-    enableClipping();
-#endif
-}
-
-void QOpenGLPaintEnginePrivate::drawFastRect(const QRectF &r)
-{
-    Q_Q(QOpenGLPaintEngine);
-    DEBUG_ONCE_STR("QOpenGLPaintEngine::drawRects(): drawing fast rect");
-
-    GLfloat vertexArray[10];
-    qt_add_rect_to_array(r, vertexArray);
-
-    if (has_pen)
-        QOpenGLCoordinateOffset::enableOffset(this);
-
-    if (has_brush) {
-        flushDrawQueue();
-
-        bool temp = high_quality_antialiasing;
-        high_quality_antialiasing = false;
-
-        q->updateCompositionMode(composition_mode);
-
-        setGradientOps(cbrush, r);
-
-        bool fast_style = current_style == Qt::LinearGradientPattern
-                          || current_style == Qt::SolidPattern;
-
-        if (fast_style && has_fast_composition_mode) {
-            glEnableClientState(GL_VERTEX_ARRAY);
-            glVertexPointer(2, GL_FLOAT, 0, vertexArray);
-            glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-            glDisableClientState(GL_VERTEX_ARRAY);
-        } else {
-            composite(r);
-        }
-
-        high_quality_antialiasing = temp;
-
-        q->updateCompositionMode(composition_mode);
-    }
-
-    if (has_pen) {
-        if (has_fast_pen && !high_quality_antialiasing) {
-            setGradientOps(cpen.brush(), r);
-
-            vertexArray[8] = vertexArray[0];
-            vertexArray[9] = vertexArray[1];
-
-            glVertexPointer(2, GL_FLOAT, 0, vertexArray);
-            glEnableClientState(GL_VERTEX_ARRAY);
-            glDrawArrays(GL_LINE_STRIP, 0, 5);
-            glDisableClientState(GL_VERTEX_ARRAY);
-        } else {
-            QPainterPath path;
-            path.setFillRule(Qt::WindingFill);
-
-            qreal left = r.left();
-            qreal right = r.right();
-            qreal top = r.top();
-            qreal bottom = r.bottom();
-
-            path.moveTo(left, top);
-            path.lineTo(right, top);
-            path.lineTo(right, bottom);
-            path.lineTo(left, bottom);
-            path.lineTo(left, top);
-
-            strokePath(path, false);
-        }
-
-        QOpenGLCoordinateOffset::disableOffset(this);
-    }
-}
-
-bool QOpenGLPaintEnginePrivate::isFastRect(const QRectF &rect)
-{
-    if (matrix.type() < QTransform::TxRotate) {
-        QRectF r = matrix.mapRect(rect);
-        return r.topLeft().toPoint() == r.topLeft()
-            && r.bottomRight().toPoint() == r.bottomRight();
-    }
-
-    return false;
-}
-
-void QOpenGLPaintEngine::drawRects(const QRect *rects, int rectCount)
-{
-    struct RectF {
-        qreal x;
-        qreal y;
-        qreal w;
-        qreal h;
-    };
-    Q_ASSERT(sizeof(RectF) == sizeof(QRectF));
-    RectF fr[256];
-    while (rectCount) {
-        int i = 0;
-        while (i < rectCount && i < 256) {
-            fr[i].x = rects[i].x();
-            fr[i].y = rects[i].y();
-            fr[i].w = rects[i].width();
-            fr[i].h = rects[i].height();
-            ++i;
-        }
-        drawRects((QRectF *)(void *)fr, i);
-        rects += i;
-        rectCount -= i;
-    }
-}
-
-void QOpenGLPaintEngine::drawRects(const QRectF *rects, int rectCount)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    if (d->use_emulation) {
-        QPaintEngineEx::drawRects(rects, rectCount);
-        return;
-    }
-
-    for (int i=0; i<rectCount; ++i) {
-        const QRectF &r = rects[i];
-
-        // optimization for rects which can be drawn aliased
-        if (!d->high_quality_antialiasing || d->isFastRect(r)) {
-            d->drawFastRect(r);
-        } else {
-            QPainterPath path;
-            path.addRect(r);
-
-            if (d->has_brush) {
-                d->disableClipping();
-                GLuint program = qt_gl_program_cache()->getProgram(d->device->context(),
-                                                                   FRAGMENT_PROGRAM_MASK_TRAPEZOID_AA, 0, true);
-
-                if (d->matrix.type() >= QTransform::TxProject) {
-                    QGLPathMaskGenerator maskGenerator(path, d->matrix, d->offscreen, program);
-                    d->addItem(qt_mask_texture_cache()->getMask(maskGenerator, d));
-                } else {
-                    QGLRectMaskGenerator maskGenerator(path, d->matrix, d->offscreen, program);
-                    d->addItem(qt_mask_texture_cache()->getMask(maskGenerator, d));
-                }
-
-                d->enableClipping();
-            }
-
-            if (d->has_pen) {
-                if (d->has_fast_pen)
-                    d->strokeLines(path);
-                else
-                    d->strokePath(path, false);
-            }
-        }
-    }
-}
-
-static void addQuadAsTriangle(GLfloat *quad, GLfloat *triangle)
-{
-    triangle[0] = quad[0];
-    triangle[1] = quad[1];
-
-    triangle[2] = quad[2];
-    triangle[3] = quad[3];
-
-    triangle[4] = quad[4];
-    triangle[5] = quad[5];
-
-    triangle[6] = quad[4];
-    triangle[7] = quad[5];
-
-    triangle[8] = quad[6];
-    triangle[9] = quad[7];
-
-    triangle[10] = quad[0];
-    triangle[11] = quad[1];
-}
-
-void QOpenGLPaintEngine::drawPoints(const QPoint *points, int pointCount)
-{
-    Q_ASSERT(sizeof(QT_PointF) == sizeof(QPointF));
-    QT_PointF fp[256];
-    while (pointCount) {
-        int i = 0;
-        while (i < pointCount && i < 256) {
-            fp[i].x = points[i].x();
-            fp[i].y = points[i].y();
-            ++i;
-        }
-        drawPoints((QPointF *)(void *)fp, i);
-        points += i;
-        pointCount -= i;
-    }
-}
-
-void QOpenGLPaintEngine::drawPoints(const QPointF *points, int pointCount)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    if (d->use_emulation) {
-        QPaintEngineEx::drawPoints(points, pointCount);
-        return;
-    }
-
-    d->setGradientOps(d->cpen.brush(), QRectF());
-
-    if (!d->cpen.isCosmetic() || d->high_quality_antialiasing) {
-        Qt::PenCapStyle capStyle = d->cpen.capStyle();
-        if (capStyle == Qt::FlatCap)
-            d->cpen.setCapStyle(Qt::SquareCap);
-        QPaintEngine::drawPoints(points, pointCount);
-        d->cpen.setCapStyle(capStyle);
-        return;
-    }
-
-    d->flushDrawQueue();
-
-    if (d->has_fast_pen) {
-        QVarLengthArray<GLfloat> vertexArray(6 * pointCount);
-
-        glMatrixMode(GL_MODELVIEW);
-        glPushMatrix();
-        glLoadIdentity();
-
-        int j = 0;
-        for (int i = 0; i < pointCount; ++i) {
-            QPointF mapped = d->matrix.map(points[i]);
-
-            GLfloat x = GLfloat(qRound(mapped.x()));
-            GLfloat y = GLfloat(qRound(mapped.y()));
-
-            vertexArray[j++] = x;
-            vertexArray[j++] = y - 0.5f;
-
-            vertexArray[j++] = x + 1.5f;
-            vertexArray[j++] = y + 1.0f;
-
-            vertexArray[j++] = x;
-            vertexArray[j++] = y + 1.0f;
-        }
-
-        glEnableClientState(GL_VERTEX_ARRAY);
-
-        glVertexPointer(2, GL_FLOAT, 0, vertexArray.constData());
-        glDrawArrays(GL_TRIANGLES, 0, pointCount*3);
-
-        glDisableClientState(GL_VERTEX_ARRAY);
-
-        glPopMatrix();
-        return;
-    }
-
-    const qreal *vertexArray = reinterpret_cast<const qreal*>(&points[0]);
-
-    if (sizeof(qreal) == sizeof(double)) {
-        Q_ASSERT(sizeof(QPointF) == 16);
-        glVertexPointer(2, GL_DOUBLE, 0, vertexArray);
-    }
-    else {
-        Q_ASSERT(sizeof(QPointF) == 8);
-        glVertexPointer(2, GL_FLOAT, 0, vertexArray);
-    }
-
-    glEnableClientState(GL_VERTEX_ARRAY);
-    glDrawArrays(GL_POINTS, 0, pointCount);
-    glDisableClientState(GL_VERTEX_ARRAY);
-}
-
-void QOpenGLPaintEngine::drawLines(const QLine *lines, int lineCount)
-{
-    struct PointF {
-        qreal x;
-        qreal y;
-    };
-    struct LineF {
-        PointF p1;
-        PointF p2;
-    };
-    Q_ASSERT(sizeof(PointF) == sizeof(QPointF));
-    Q_ASSERT(sizeof(LineF) == sizeof(QLineF));
-    LineF fl[256];
-    while (lineCount) {
-        int i = 0;
-        while (i < lineCount && i < 256) {
-            fl[i].p1.x = lines[i].x1();
-            fl[i].p1.y = lines[i].y1();
-            fl[i].p2.x = lines[i].x2();
-            fl[i].p2.y = lines[i].y2();
-            ++i;
-        }
-        drawLines((QLineF *)(void *)fl, i);
-        lines += i;
-        lineCount -= i;
-    }
-}
-
-void QOpenGLPaintEngine::drawLines(const QLineF *lines, int lineCount)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    if (d->use_emulation) {
-        QPaintEngineEx::drawLines(lines, lineCount);
-        return;
-    }
-
-    if (d->has_pen) {
-        QOpenGLCoordinateOffset offset(d);
-        if (d->has_fast_pen && !d->high_quality_antialiasing) {
-            //### gradient resolving on lines isn't correct
-            d->setGradientOps(d->cpen.brush(), QRectF());
-
-            bool useRects = false;
-            // scale or 90 degree rotation?
-            if (d->matrix.type() <= QTransform::TxTranslate
-                || (!d->cpen.isCosmetic()
-                    && (d->matrix.type() <= QTransform::TxScale
-                        || (d->matrix.type() == QTransform::TxRotate
-                            && d->matrix.m11() == 0 && d->matrix.m22() == 0)))) {
-                useRects = true;
-                for (int i = 0; i < lineCount; ++i) {
-                    if (lines[i].p1().x() != lines[i].p2().x()
-                        && lines[i].p1().y() != lines[i].p2().y()) {
-                        useRects = false;
-                        break;
-                    }
-                }
-            }
-
-            GLfloat endCap = d->cpen.capStyle() == Qt::FlatCap ? 0.0f : 0.5f;
-            if (useRects) {
-                QVarLengthArray<GLfloat> vertexArray(12 * lineCount);
-
-                GLfloat quad[8];
-                for (int i = 0; i < lineCount; ++i) {
-                    GLfloat x1 = lines[i].x1();
-                    GLfloat x2 = lines[i].x2();
-                    GLfloat y1 = lines[i].y1();
-                    GLfloat y2 = lines[i].y2();
-
-                    if (x1 == x2) {
-                        if (y1 > y2)
-                            qSwap(y1, y2);
-
-                        quad[0] = x1 - 0.5f;
-                        quad[1] = y1 - endCap;
-
-                        quad[2] = x1 + 0.5f;
-                        quad[3] = y1 - endCap;
-
-                        quad[4] = x1 + 0.5f;
-                        quad[5] = y2 + endCap;
-
-                        quad[6] = x1 - 0.5f;
-                        quad[7] = y2 + endCap;
-                    } else {
-                        if (x1 > x2)
-                            qSwap(x1, x2);
-
-                        quad[0] = x1 - endCap;
-                        quad[1] = y1 + 0.5f;
-
-                        quad[2] = x1 - endCap;
-                        quad[3] = y1 - 0.5f;
-
-                        quad[4] = x2 + endCap;
-                        quad[5] = y1 - 0.5f;
-
-                        quad[6] = x2 + endCap;
-                        quad[7] = y1 + 0.5f;
-                    }
-
-                    addQuadAsTriangle(quad, &vertexArray[12*i]);
-                }
-
-                glEnableClientState(GL_VERTEX_ARRAY);
-
-                glVertexPointer(2, GL_FLOAT, 0, vertexArray.constData());
-                glDrawArrays(GL_TRIANGLES, 0, lineCount*6);
-
-                glDisableClientState(GL_VERTEX_ARRAY);
-            } else {
-                QVarLengthArray<GLfloat> vertexArray(4 * lineCount);
-                for (int i = 0; i < lineCount; ++i) {
-                    const QPointF a = lines[i].p1();
-                    vertexArray[4*i]   = lines[i].x1();
-                    vertexArray[4*i+1] = lines[i].y1();
-                    vertexArray[4*i+2] = lines[i].x2();
-                    vertexArray[4*i+3] = lines[i].y2();
-                }
-
-                glEnableClientState(GL_VERTEX_ARRAY);
-
-                glVertexPointer(2, GL_FLOAT, 0, vertexArray.constData());
-                glDrawArrays(GL_LINES, 0, lineCount*2);
-
-                glVertexPointer(2, GL_FLOAT, 4*sizeof(GLfloat), vertexArray.constData() + 2);
-                glDrawArrays(GL_POINTS, 0, lineCount);
-
-                glDisableClientState(GL_VERTEX_ARRAY);
-            }
-        } else {
-            QPainterPath path;
-            path.setFillRule(Qt::WindingFill);
-            for (int i=0; i<lineCount; ++i) {
-                const QLineF &l = lines[i];
-
-                if (l.p1() == l.p2()) {
-                    if (d->cpen.capStyle() != Qt::FlatCap) {
-                        QPointF p = l.p1();
-                        drawPoints(&p, 1);
-                    }
-                    continue;
-                }
-
-                path.moveTo(l.x1(), l.y1());
-                path.lineTo(l.x2(), l.y2());
-            }
-
-            if (d->has_fast_pen && d->high_quality_antialiasing)
-                d->strokeLines(path);
-            else
-                d->strokePath(path, false);
-        }
-    }
-}
-
-void QOpenGLPaintEngine::drawPolygon(const QPoint *points, int pointCount, PolygonDrawMode mode)
-{
-    Q_ASSERT(sizeof(QT_PointF) == sizeof(QPointF));
-    QVarLengthArray<QT_PointF> p(pointCount);
-    for (int i=0; i<pointCount; ++i) {
-        p[i].x = points[i].x();
-        p[i].y = points[i].y();
-    }
-    drawPolygon((QPointF *)p.data(), pointCount, mode);
-}
-
-void QOpenGLPaintEngine::drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode)
-{
-    Q_D(QOpenGLPaintEngine);
-    if(pointCount < 2)
-        return;
-
-    if (d->use_emulation) {
-        QPaintEngineEx::drawPolygon(points, pointCount, mode);
-        return;
-    }
-
-    QRectF bounds;
-    if ((mode == ConvexMode && !d->high_quality_antialiasing && state()->brushNeedsResolving()) ||
-        ((d->has_fast_pen && !d->high_quality_antialiasing) && state()->penNeedsResolving())) {
-        qreal minx = points[0].x(), miny = points[0].y(),
-              maxx = points[0].x(), maxy = points[0].y();
-        for (int i = 1; i < pointCount; ++i) {
-            const QPointF &pt = points[i];
-            if (minx > pt.x())
-                minx = pt.x();
-            if (miny > pt.y())
-                miny = pt.y();
-            if (maxx < pt.x())
-                maxx = pt.x();
-            if (maxy < pt.y())
-                maxy = pt.y();
-        }
-        bounds = QRectF(minx, maxx, maxx-minx, maxy-miny);
-    }
-
-    QOpenGLCoordinateOffset offset(d);
-
-    if (d->has_brush && mode != PolylineMode) {
-        if (mode == ConvexMode && !d->high_quality_antialiasing) {
-            //### resolving on polygon from points isn't correct
-            d->setGradientOps(d->cbrush, bounds);
-
-            const qreal *vertexArray = reinterpret_cast<const qreal*>(&points[0]);
-
-            if (sizeof(qreal) == sizeof(double)) {
-                Q_ASSERT(sizeof(QPointF) == 16);
-                glVertexPointer(2, GL_DOUBLE, 0, vertexArray);
-            }
-            else {
-                Q_ASSERT(sizeof(QPointF) == 8);
-                glVertexPointer(2, GL_FLOAT, 0, vertexArray);
-            }
-
-            glEnableClientState(GL_VERTEX_ARRAY);
-            glDrawArrays(GL_TRIANGLE_FAN, 0, pointCount);
-            glDisableClientState(GL_VERTEX_ARRAY);
-        } else {
-            QPainterPath path;
-            path.setFillRule(mode == WindingMode ? Qt::WindingFill : Qt::OddEvenFill);
-            path.moveTo(points[0]);
-            for (int i=1; i<pointCount; ++i)
-                path.lineTo(points[i]);
-            d->fillPath(path);
-        }
-    }
-
-    if (d->has_pen) {
-        if (d->has_fast_pen && !d->high_quality_antialiasing) {
-            d->setGradientOps(d->cpen.brush(), bounds);
-            QVarLengthArray<GLfloat> vertexArray(pointCount*2 + 2);
-            glVertexPointer(2, GL_FLOAT, 0, vertexArray.constData());
-            int i;
-            for (i=0; i<pointCount; ++i) {
-                vertexArray[i*2] = points[i].x();
-                vertexArray[i*2+1] = points[i].y();
-            }
-
-            glEnableClientState(GL_VERTEX_ARRAY);
-            if (mode != PolylineMode) {
-                vertexArray[i*2] = vertexArray[0];
-                vertexArray[i*2+1] = vertexArray[1];
-                glDrawArrays(GL_LINE_STRIP, 0, pointCount+1);
-            } else {
-                glDrawArrays(GL_LINE_STRIP, 0, pointCount);
-                glDrawArrays(GL_POINTS, pointCount-1, 1);
-            }
-            glDisableClientState(GL_VERTEX_ARRAY);
-        } else {
-            QPainterPath path(points[0]);
-            for (int i = 1; i < pointCount; ++i)
-                path.lineTo(points[i]);
-            if (mode != PolylineMode)
-                path.lineTo(points[0]);
-
-            if (d->has_fast_pen)
-                d->strokeLines(path);
-            else
-                d->strokePath(path, true);
-        }
-    }
-}
-
-void QOpenGLPaintEnginePrivate::strokeLines(const QPainterPath &path)
-{
-    DEBUG_ONCE_STR("QOpenGLPaintEnginePrivate::strokeLines()");
-
-    qreal penWidth = cpen.widthF();
-
-    GLuint program = qt_gl_program_cache()->getProgram(device->context(),
-                                                       FRAGMENT_PROGRAM_MASK_TRAPEZOID_AA, 0, true);
-    QGLLineMaskGenerator maskGenerator(path, matrix, penWidth == 0 ? 1.0 : penWidth,
-                                       offscreen, program);
-
-    disableClipping();
-
-    QBrush temp = cbrush;
-    QPointF origin = brush_origin;
-
-    cbrush = cpen.brush();
-    brush_origin = QPointF();
-
-    addItem(qt_mask_texture_cache()->getMask(maskGenerator, this));
-
-    cbrush = temp;
-    brush_origin = origin;
-
-    enableClipping();
-}
-
-Q_GUI_EXPORT bool qt_scaleForTransform(const QTransform &transform, qreal *scale); // qtransform.cpp
-
-void QOpenGLPaintEnginePrivate::strokePath(const QPainterPath &path, bool use_cache)
-{
-    QBrush old_brush = cbrush;
-    cbrush = cpen.brush();
-
-    qreal txscale = 1;
-    if (cpen.isCosmetic() || (qt_scaleForTransform(matrix, &txscale) && txscale != 1)) {
-        QTransform temp = matrix;
-        matrix = QTransform();
-        glPushMatrix();
-
-        if (has_antialiasing) {
-            glLoadIdentity();
-        } else {
-            float offs_matrix[] =
-              { 1, 0, 0, 0,
-                0, 1, 0, 0,
-                0, 0, 1, 0,
-                0.5, 0.5, 0, 1 };
-            glLoadMatrixf(offs_matrix);
-        }
-
-        QPen pen = cpen;
-        if (txscale != 1)
-            pen.setWidthF(pen.widthF() * txscale);
-        if (use_cache)
-            fillPath(qt_opengl_stroke_cache()->getStrokedPath(temp.map(path), pen));
-        else
-            fillPath(strokeForPath(temp.map(path), pen));
-
-        glPopMatrix();
-        matrix = temp;
-    } else if (use_cache) {
-        fillPath(qt_opengl_stroke_cache()->getStrokedPath(path, cpen));
-    } else {
-        fillPath(strokeForPath(path, cpen));
-    }
-
-    cbrush = old_brush;
-}
-
-void QOpenGLPaintEnginePrivate::strokePathFastPen(const QPainterPath &path, bool needsResolving)
-{
-#ifndef QT_OPENGL_ES
-    QRectF bounds;
-    if (needsResolving)
-        bounds = path.controlPointRect();
-    setGradientOps(cpen.brush(), bounds);
-
-    QBezier beziers[32];
-    for (int i=0; i<path.elementCount(); ++i) {
-        const QPainterPath::Element &e = path.elementAt(i);
-        switch (e.type) {
-        case QPainterPath::MoveToElement:
-            if (i != 0)
-                glEnd(); // GL_LINE_STRIP
-            glBegin(GL_LINE_STRIP);
-            glVertex2d(e.x, e.y);
-
-            break;
-        case QPainterPath::LineToElement:
-            glVertex2d(e.x, e.y);
-            break;
-
-        case QPainterPath::CurveToElement:
-        {
-            QPointF sp = path.elementAt(i-1);
-            QPointF cp2 = path.elementAt(i+1);
-            QPointF ep = path.elementAt(i+2);
-            i+=2;
-
-            qreal inverseScaleHalf = inverseScale / 2;
-            beziers[0] = QBezier::fromPoints(sp, e, cp2, ep);
-            QBezier *b = beziers;
-            while (b >= beziers) {
-                // check if we can pop the top bezier curve from the stack
-                qreal l = qAbs(b->x4 - b->x1) + qAbs(b->y4 - b->y1);
-                qreal d;
-                if (l > inverseScale) {
-                    d = qAbs( (b->x4 - b->x1)*(b->y1 - b->y2)
-                              - (b->y4 - b->y1)*(b->x1 - b->x2) )
-                        + qAbs( (b->x4 - b->x1)*(b->y1 - b->y3)
-                                - (b->y4 - b->y1)*(b->x1 - b->x3) );
-                    d /= l;
-                } else {
-                    d = qAbs(b->x1 - b->x2) + qAbs(b->y1 - b->y2) +
-                        qAbs(b->x1 - b->x3) + qAbs(b->y1 - b->y3);
-                }
-                if (d < inverseScaleHalf || b == beziers + 31) {
-                    // good enough, we pop it off and add the endpoint
-                    glVertex2d(b->x4, b->y4);
-                    --b;
-                } else {
-                    // split, second half of the polygon goes lower into the stack
-                    b->split(b+1, b);
-                    ++b;
-                }
-            }
-        } // case CurveToElement
-        default:
-            break;
-        } // end of switch
-    }
-    glEnd(); // GL_LINE_STRIP
-#else
-    // have to use vertex arrays on embedded
-    QRectF bounds;
-    if (needsResolving)
-        bounds = path.controlPointRect();
-    setGradientOps(cpen.brush(), bounds);
-
-    glEnableClientState(GL_VERTEX_ARRAY);
-    tess_points.reset();
-    QBezier beziers[32];
-    for (int i=0; i<path.elementCount(); ++i) {
-        const QPainterPath::Element &e = path.elementAt(i);
-        switch (e.type) {
-        case QPainterPath::MoveToElement:
-            if (i != 0) {
-                glVertexPointer(2, GL_FLOAT, 0, tess_points.data());
-                glDrawArrays(GL_LINE_STRIP, 0, tess_points.size());
-                tess_points.reset();
-            }
-            tess_points.add(QPointF(e.x, e.y));
-
-            break;
-        case QPainterPath::LineToElement:
-            tess_points.add(QPointF(e.x, e.y));
-            break;
-
-        case QPainterPath::CurveToElement:
-        {
-            QPointF sp = path.elementAt(i-1);
-            QPointF cp2 = path.elementAt(i+1);
-            QPointF ep = path.elementAt(i+2);
-            i+=2;
-
-            qreal inverseScaleHalf = inverseScale / 2;
-            beziers[0] = QBezier::fromPoints(sp, e, cp2, ep);
-            QBezier *b = beziers;
-            while (b >= beziers) {
-                // check if we can pop the top bezier curve from the stack
-                qreal l = qAbs(b->x4 - b->x1) + qAbs(b->y4 - b->y1);
-                qreal d;
-                if (l > inverseScale) {
-                    d = qAbs( (b->x4 - b->x1)*(b->y1 - b->y2)
-                              - (b->y4 - b->y1)*(b->x1 - b->x2) )
-                        + qAbs( (b->x4 - b->x1)*(b->y1 - b->y3)
-                                - (b->y4 - b->y1)*(b->x1 - b->x3) );
-                    d /= l;
-                } else {
-                    d = qAbs(b->x1 - b->x2) + qAbs(b->y1 - b->y2) +
-                        qAbs(b->x1 - b->x3) + qAbs(b->y1 - b->y3);
-                }
-                if (d < inverseScaleHalf || b == beziers + 31) {
-                    // good enough, we pop it off and add the endpoint
-                    tess_points.add(QPointF(b->x4, b->y4));
-                    --b;
-                } else {
-                    // split, second half of the polygon goes lower into the stack
-                    b->split(b+1, b);
-                    ++b;
-                }
-            }
-        } // case CurveToElement
-        default:
-            break;
-        } // end of switch
-    }
-    glVertexPointer(2, GL_FLOAT, 0, tess_points.data());
-    glDrawArrays(GL_LINE_STRIP, 0, tess_points.size());
-    glDisableClientState(GL_VERTEX_ARRAY);
-#endif
-}
-
-static bool pathClosed(const QPainterPath &path)
-{
-    QPointF lastMoveTo = path.elementAt(0);
-    QPointF lastPoint = lastMoveTo;
-
-    for (int i = 1; i < path.elementCount(); ++i) {
-        const QPainterPath::Element &e = path.elementAt(i);
-        switch (e.type) {
-        case QPainterPath::MoveToElement:
-            if (lastMoveTo != lastPoint)
-                return false;
-            lastMoveTo = lastPoint = e;
-            break;
-        case QPainterPath::LineToElement:
-            lastPoint = e;
-            break;
-        case QPainterPath::CurveToElement:
-            lastPoint = path.elementAt(i + 2);
-            i+=2;
-            break;
-        default:
-            break;
-        }
-    }
-
-    return lastMoveTo == lastPoint;
-}
-
-void QOpenGLPaintEngine::drawPath(const QPainterPath &path)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    if (path.isEmpty())
-        return;
-
-    if (d->use_emulation) {
-        QPaintEngineEx::drawPath(path);
-        return;
-    }
-
-    QOpenGLCoordinateOffset offset(d);
-
-    if (d->has_brush) {
-        bool path_closed = pathClosed(path);
-
-        bool has_thick_pen =
-            path_closed
-            && d->has_pen
-            && d->cpen.style() == Qt::SolidLine
-            && d->cpen.isSolid()
-            && d->cpen.color().alpha() == 255
-            && d->txop < QTransform::TxProject
-            && d->cpen.widthF() >= 2 / qSqrt(qMin(d->matrix.m11() * d->matrix.m11()
-                                                  + d->matrix.m21() * d->matrix.m21(),
-                                                  d->matrix.m12() * d->matrix.m12()
-                                                  + d->matrix.m22() * d->matrix.m22()));
-
-        if (has_thick_pen) {
-            DEBUG_ONCE qDebug() << "QOpenGLPaintEngine::drawPath(): Using thick pen optimization, style:" << d->cbrush.style();
-
-            d->flushDrawQueue();
-
-            bool temp = d->high_quality_antialiasing;
-            d->high_quality_antialiasing = false;
-
-            updateCompositionMode(d->composition_mode);
-
-            d->fillPath(path);
-
-            d->high_quality_antialiasing = temp;
-            updateCompositionMode(d->composition_mode);
-        } else {
-            d->fillPath(path);
-        }
-    }
-
-    if (d->has_pen) {
-        if (d->has_fast_pen && !d->high_quality_antialiasing)
-            d->strokePathFastPen(path, state()->penNeedsResolving());
-        else
-            d->strokePath(path, true);
-    }
-}
-
-void QOpenGLPaintEnginePrivate::drawImageAsPath(const QRectF &r, const QImage &img, const QRectF &sr)
-{
-    QBrush old_brush = cbrush;
-    QPointF old_brush_origin = brush_origin;
-
-    qreal scaleX = r.width() / sr.width();
-    qreal scaleY = r.height() / sr.height();
-
-    QTransform brush_matrix = QTransform::fromTranslate(r.left(), r.top());
-    brush_matrix.scale(scaleX, scaleY);
-    brush_matrix.translate(-sr.left(), -sr.top());
-
-    cbrush = QBrush(img);
-    cbrush.setTransform(brush_matrix);
-    brush_origin = QPointF();
-
-    QPainterPath p;
-    p.addRect(r);
-    fillPath(p);
-
-    cbrush = old_brush;
-    brush_origin = old_brush_origin;
-}
-
-void QOpenGLPaintEnginePrivate::drawTiledImageAsPath(const QRectF &r, const QImage &img, qreal sx, qreal sy,
-                                                     const QPointF &offset)
-{
-    QBrush old_brush = cbrush;
-    QPointF old_brush_origin = brush_origin;
-
-    QTransform brush_matrix = QTransform::fromTranslate(r.left(), r.top());
-    brush_matrix.scale(sx, sy);
-    brush_matrix.translate(-offset.x(), -offset.y());
-
-    cbrush = QBrush(img);
-    cbrush.setTransform(brush_matrix);
-    brush_origin = QPointF();
-
-    QPainterPath p;
-    p.addRect(r);
-    fillPath(p);
-
-    cbrush = old_brush;
-    brush_origin = old_brush_origin;
-}
-
-static const QRectF scaleRect(const QRectF &r, qreal sx, qreal sy)
-{
-    return QRectF(r.x() * sx, r.y() * sy, r.width() * sx, r.height() * sy);
-}
-
-template <typename T>
-static const T qSubImage(const T &image, const QRectF &src, QRectF *srcNew)
-{
-    const int sx1 = qMax(0, qFloor(src.left()));
-    const int sy1 = qMax(0, qFloor(src.top()));
-    const int sx2 = qMin(image.width(), qCeil(src.right()));
-    const int sy2 = qMin(image.height(), qCeil(src.bottom()));
-
-    const T sub = image.copy(sx1, sy1, sx2 - sx1, sy2 - sy1);
-
-    if (srcNew)
-        *srcNew = src.translated(-sx1, -sy1);
-
-    return sub;
-}
-
-void QOpenGLPaintEngine::drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr)
-{
-    Q_D(QOpenGLPaintEngine);
-    if (pm.depth() == 1) {
-        QPixmap tpx(pm.size());
-        tpx.fill(Qt::transparent);
-        QPainter p(&tpx);
-        p.setPen(d->cpen);
-        p.drawPixmap(0, 0, pm);
-        p.end();
-        drawPixmap(r, tpx, sr);
-        return;
-    }
-
-    const int sz = d->max_texture_size;
-    if (pm.width() > sz || pm.height() > sz) {
-        QRectF subsr;
-        const QPixmap sub = qSubImage(pm, sr, &subsr);
-
-        if (sub.width() <= sz && sub.height() <= sz) {
-            drawPixmap(r, sub, subsr);
-        } else {
-            const QPixmap scaled = sub.scaled(sz, sz, Qt::KeepAspectRatio);
-            const qreal sx = scaled.width() / qreal(sub.width());
-            const qreal sy = scaled.height() / qreal(sub.height());
-
-            drawPixmap(r, scaled, scaleRect(subsr, sx, sy));
-        }
-        return;
-    }
-
-
-    if (d->composition_mode > QPainter::CompositionMode_Plus || (d->high_quality_antialiasing && !d->isFastRect(r)))
-        d->drawImageAsPath(r, pm.toImage(), sr);
-    else {
-        GLenum target = qt_gl_preferredTextureTarget();
-        d->flushDrawQueue();
-        QGLTexture *tex =
-            d->device->context()->d_func()->bindTexture(pm, target, GL_RGBA,
-                                                        QGLContext::InternalBindOption);
-        drawTextureRect(pm.width(), pm.height(), r, sr, target, tex);
-    }
-}
-
-void QOpenGLPaintEngine::drawTiledPixmap(const QRectF &r, const QPixmap &pm, const QPointF &offset)
-{
-    Q_D(QOpenGLPaintEngine);
-    if (pm.depth() == 1) {
-        QPixmap tpx(pm.size());
-        tpx.fill(Qt::transparent);
-        QPainter p(&tpx);
-        p.setPen(d->cpen);
-        p.drawPixmap(0, 0, pm);
-        p.end();
-        drawTiledPixmap(r, tpx, offset);
-        return;
-    }
-
-    QImage scaled;
-    const int sz = d->max_texture_size;
-    if (pm.width() > sz || pm.height() > sz) {
-        int rw = qCeil(r.width());
-        int rh = qCeil(r.height());
-        if (rw < pm.width() && rh < pm.height()) {
-            drawTiledPixmap(r, pm.copy(0, 0, rw, rh), offset);
-            return;
-        }
-
-        scaled = pm.toImage().scaled(sz, sz, Qt::KeepAspectRatio);
-    }
-
-    if (d->composition_mode > QPainter::CompositionMode_Plus || (d->high_quality_antialiasing && !d->isFastRect(r))) {
-        if (scaled.isNull())
-            d->drawTiledImageAsPath(r, pm.toImage(), 1, 1, offset);
-        else {
-            const qreal sx = pm.width() / qreal(scaled.width());
-            const qreal sy = pm.height() / qreal(scaled.height());
-            d->drawTiledImageAsPath(r, scaled, sx, sy, offset);
-        }
-    } else {
-        d->flushDrawQueue();
-
-        QGLTexture *tex;
-        if (scaled.isNull())
-            tex = d->device->context()->d_func()->bindTexture(pm, GL_TEXTURE_2D, GL_RGBA,
-                                                              QGLContext::InternalBindOption);
-        else
-            tex = d->device->context()->d_func()->bindTexture(scaled, GL_TEXTURE_2D, GL_RGBA,
-                                                              QGLContext::InternalBindOption);
-        updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, d->use_smooth_pixmap_transform);
-
-#ifndef QT_OPENGL_ES
-        glPushAttrib(GL_CURRENT_BIT);
-        glDisable(GL_TEXTURE_GEN_S);
-#endif
-        glColor4f(d->opacity, d->opacity, d->opacity, d->opacity);
-        glEnable(GL_TEXTURE_2D);
-
-        GLdouble tc_w = r.width()/pm.width();
-        GLdouble tc_h = r.height()/pm.height();
-
-        // Rotate the texture so that it is aligned correctly and the
-        // wrapping is done correctly
-        if (tex->options & QGLContext::InvertedYBindOption) {
-            glMatrixMode(GL_TEXTURE);
-            glPushMatrix();
-            glRotatef(180.0, 0.0, 1.0, 0.0);
-            glRotatef(180.0, 0.0, 0.0, 1.0);
-        }
-
-        GLfloat vertexArray[4*2];
-        GLfloat texCoordArray[4*2];
-
-        double offset_x = offset.x() / pm.width();
-        double offset_y = offset.y() / pm.height();
-
-        qt_add_rect_to_array(r, vertexArray);
-        qt_add_texcoords_to_array(offset_x, offset_y,
-                                  tc_w + offset_x, tc_h + offset_y, texCoordArray);
-
-        glVertexPointer(2, GL_FLOAT, 0, vertexArray);
-        glTexCoordPointer(2, GL_FLOAT, 0, texCoordArray);
-
-        glEnableClientState(GL_VERTEX_ARRAY);
-        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
-        glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
-        glDisableClientState(GL_VERTEX_ARRAY);
-        if (tex->options & QGLContext::InvertedYBindOption)
-            glPopMatrix();
-
-        glDisable(GL_TEXTURE_2D);
-#ifndef QT_OPENGL_ES
-        glPopAttrib();
-#endif
-    }
-}
-
-void QOpenGLPaintEngine::drawImage(const QRectF &r, const QImage &image, const QRectF &sr,
-                                   Qt::ImageConversionFlags)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    const int sz = d->max_texture_size;
-    if (image.width() > sz || image.height() > sz) {
-        QRectF subsr;
-        const QImage sub = qSubImage(image, sr, &subsr);
-
-        if (sub.width() <= sz && sub.height() <= sz) {
-            drawImage(r, sub, subsr, 0);
-        } else {
-            const QImage scaled = sub.scaled(sz, sz, Qt::KeepAspectRatio);
-            const qreal sx = scaled.width() / qreal(sub.width());
-            const qreal sy = scaled.height() / qreal(sub.height());
-
-            drawImage(r, scaled, scaleRect(subsr, sx, sy), 0);
-        }
-        return;
-    }
-
-    if (d->composition_mode > QPainter::CompositionMode_Plus || (d->high_quality_antialiasing && !d->isFastRect(r)))
-        d->drawImageAsPath(r, image, sr);
-    else {
-        GLenum target = qt_gl_preferredTextureTarget();
-        d->flushDrawQueue();
-        QGLTexture *tex =
-            d->device->context()->d_func()->bindTexture(image, target, GL_RGBA,
-                                                        QGLContext::InternalBindOption);
-        drawTextureRect(image.width(), image.height(), r, sr, target, tex);
-    }
-}
-
-void QOpenGLPaintEngine::drawTextureRect(int tx_width, int tx_height, const QRectF &r,
-                                         const QRectF &sr, GLenum target, QGLTexture *tex)
-{
-    Q_D(QOpenGLPaintEngine);
-#ifndef QT_OPENGL_ES
-    glPushAttrib(GL_CURRENT_BIT);
-    glDisable(GL_TEXTURE_GEN_S);
-#endif
-    glColor4f(d->opacity, d->opacity, d->opacity, d->opacity);
-    glEnable(target);
-    updateTextureFilter(target, GL_CLAMP_TO_EDGE, d->use_smooth_pixmap_transform);
-
-    qreal x1, x2, y1, y2;
-    if (target == GL_TEXTURE_2D) {
-        x1 = sr.x() / tx_width;
-        x2 = x1 + sr.width() / tx_width;
-        if (tex->options & QGLContext::InvertedYBindOption) {
-            y1 = 1 - (sr.bottom() / tx_height);
-            y2 = 1 - (sr.y() / tx_height);
-        } else {
-            y1 = sr.bottom() / tx_height;
-            y2 = sr.y() / tx_height;
-        }
-    } else {
-        x1 = sr.x();
-        x2 = sr.right();
-        y1 = sr.bottom();
-        y2 = sr.y();
-    }
-
-    GLfloat vertexArray[4*2];
-    GLfloat texCoordArray[4*2];
-
-    qt_add_rect_to_array(r, vertexArray);
-    qt_add_texcoords_to_array(x1, y2, x2, y1, texCoordArray);
-
-    glVertexPointer(2, GL_FLOAT, 0, vertexArray);
-    glTexCoordPointer(2, GL_FLOAT, 0, texCoordArray);
-
-    glEnableClientState(GL_VERTEX_ARRAY);
-    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
-    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
-    glDisableClientState(GL_VERTEX_ARRAY);
-
-    glDisable(target);
-#ifndef QT_OPENGL_ES
-    glPopAttrib();
-#endif
-}
-
-#ifdef Q_WS_WIN
-HDC
-#else
-Qt::HANDLE
-#endif
-QOpenGLPaintEngine::handle() const
-{
-    return 0;
-}
-
-static const int x_margin = 1;
-static const int y_margin = 0;
-
-struct QGLGlyphCoord {
-    // stores the offset and size of a glyph texture
-    qreal x;
-    qreal y;
-    qreal width;
-    qreal height;
-    qreal log_width;
-    qreal log_height;
-    QFixed x_offset;
-    QFixed y_offset;
-};
-
-struct QGLFontTexture {
-    int x_offset; // glyph offset within the
-    int y_offset;
-    GLuint texture;
-    int width;
-    int height;
-};
-
-typedef QHash<glyph_t, QGLGlyphCoord*>  QGLGlyphHash;
-typedef QHash<QFontEngine*, QGLGlyphHash*> QGLFontGlyphHash;
-typedef QHash<quint64, QGLFontTexture*> QGLFontTexHash;
-typedef QHash<const QGLContext*, QGLFontGlyphHash*> QGLContextHash;
-
-static inline void qt_delete_glyph_hash(QGLGlyphHash *hash)
-{
-    qDeleteAll(*hash);
-    delete hash;
-}
-
-class QGLGlyphCache : public QObject
-{
-    Q_OBJECT
-public:
-    QGLGlyphCache() : QObject(0) { current_cache = 0; }
-    ~QGLGlyphCache();
-    QGLGlyphCoord *lookup(QFontEngine *, glyph_t);
-    void cacheGlyphs(QGLContext *, QFontEngine *, glyph_t *glyphs, int numGlyphs);
-    void cleanCache();
-    void allocTexture(int width, int height, GLuint texture);
-
-public slots:
-    void cleanupContext(const QGLContext *);
-    void fontEngineDestroyed(QObject *);
-    void widgetDestroyed(QObject *);
-
-protected:
-    QGLGlyphHash *current_cache;
-    QGLFontTexHash qt_font_textures;
-    QGLContextHash qt_context_cache;
-};
-
-QGLGlyphCache::~QGLGlyphCache()
-{
-//     qDebug() << "cleaning out the QGLGlyphCache";
-    cleanCache();
-}
-
-void QGLGlyphCache::fontEngineDestroyed(QObject *o)
-{
-//     qDebug() << "fontEngineDestroyed()";
-    QFontEngine *fe = static_cast<QFontEngine *>(o); // safe, since only the type is used
-    QList<const QGLContext *> keys = qt_context_cache.keys();
-    const QGLContext *ctx = 0;
-
-    for (int i=0; i < keys.size(); ++i) {
-        QGLFontGlyphHash *font_cache = qt_context_cache.value(keys.at(i));
-        if (font_cache->find(fe) != font_cache->end()) {
-            ctx = keys.at(i);
-            QGLGlyphHash *cache = font_cache->take(fe);
-            qt_delete_glyph_hash(cache);
-            break;
-        }
-    }
-
-    quint64 font_key = (reinterpret_cast<quint64>(ctx) << 32) | reinterpret_cast<quint64>(fe);
-    QGLFontTexture *tex = qt_font_textures.take(font_key);
-    if (tex) {
-#ifdef Q_WS_MAC
-        if (
-#  ifndef QT_MAC_USE_COCOA
-            aglGetCurrentContext() != 0
-#  else
-            qt_current_nsopengl_context() != 0
-#  endif
-           )
-#endif
-            glDeleteTextures(1, &tex->texture);
-        delete tex;
-    }
-}
-
-void QGLGlyphCache::widgetDestroyed(QObject *)
-{
-//     qDebug() << "widget destroyed";
-    cleanCache(); // ###
-}
-
-void QGLGlyphCache::cleanupContext(const QGLContext *ctx)
-{
-//     qDebug() << "==> cleaning for: " << hex << ctx;
-    QGLFontGlyphHash *font_cache = qt_context_cache.take(ctx);
-
-    if (font_cache) {
-        QList<QFontEngine *> keys = font_cache->keys();
-        for (int i=0; i < keys.size(); ++i) {
-            QFontEngine *fe = keys.at(i);
-            qt_delete_glyph_hash(font_cache->take(fe));
-            quint64 font_key = (reinterpret_cast<quint64>(ctx) << 32) | reinterpret_cast<quint64>(fe);
-            QGLFontTexture *font_tex = qt_font_textures.take(font_key);
-            if (font_tex) {
-#ifdef Q_WS_MAC
-                if (
-#  ifndef QT_MAC_USE_COCOA
-            aglGetCurrentContext() == 0
-#  else
-            qt_current_nsopengl_context() != 0
-#  endif
-                   )
-#endif
-                    glDeleteTextures(1, &font_tex->texture);
-                delete font_tex;
-            }
-        }
-        delete font_cache;
-    }
-//    qDebug() << "<=== done cleaning, num tex:" << qt_font_textures.size() << "num ctx:" << qt_context_cache.size();
-}
-
-void QGLGlyphCache::cleanCache()
-{
-    QGLFontTexHash::const_iterator it = qt_font_textures.constBegin();
-    if (QGLContext::currentContext()) {
-        while (it != qt_font_textures.constEnd()) {
-#if defined(Q_WS_MAC) && defined(QT_MAC_USE_COCOA)
-            if (qt_current_nsopengl_context() == 0)
-                break;
-#endif
-            glDeleteTextures(1, &it.value()->texture);
-            ++it;
-        }
-    }
-    qDeleteAll(qt_font_textures);
-    qt_font_textures.clear();
-
-    QList<const QGLContext *> keys = qt_context_cache.keys();
-    for (int i=0; i < keys.size(); ++i) {
-        QGLFontGlyphHash *font_cache = qt_context_cache.value(keys.at(i));
-        QGLFontGlyphHash::Iterator it = font_cache->begin();
-        for (; it != font_cache->end(); ++it)
-            qt_delete_glyph_hash(it.value());
-        font_cache->clear();
-    }
-    qDeleteAll(qt_context_cache);
-    qt_context_cache.clear();
-}
-
-void QGLGlyphCache::allocTexture(int width, int height, GLuint texture)
-{
-    uchar *tex_data = (uchar *) malloc(width*height*2);
-    memset(tex_data, 0, width*height*2);
-    glBindTexture(GL_TEXTURE_2D, texture);
-#ifndef QT_OPENGL_ES
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE8_ALPHA8,
-                 width, height, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, tex_data);
-#else
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE_ALPHA,
-                 width, height, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, tex_data);
-#endif
-    free(tex_data);
-}
-
-#if 0
-// useful for debugging the glyph cache
-static QImage getCurrentTexture(const QColor &color, QGLFontTexture *font_tex)
-{
-    ushort *old_tex_data = (ushort *) malloc(font_tex->width*font_tex->height*2);
-    glGetTexImage(GL_TEXTURE_2D, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, old_tex_data);
-    QImage im(font_tex->width, font_tex->height, QImage::Format_ARGB32);
-    for (int y=0; y<font_tex->height; ++y) {
-        for (int x=0; x<font_tex->width; ++x) {
-            im.setPixel(x, y, ((*(old_tex_data+x+y*font_tex->width)) << 24) | (0x00ffffff & color.rgb()));
-        }
-    }
-    delete old_tex_data;
-    return im;
-}
-#endif
-
-void QGLGlyphCache::cacheGlyphs(QGLContext *context, QFontEngine *fontEngine,
-                                glyph_t *glyphs, int numGlyphs)
-{
-    QGLContextHash::const_iterator dev_it = qt_context_cache.constFind(context);
-    QGLFontGlyphHash *font_cache = 0;
-    const QGLContext *context_key = 0;
-
-    if (dev_it == qt_context_cache.constEnd()) {
-        // check for shared contexts
-        QList<const QGLContext *> contexts = qt_context_cache.keys();
-        for (int i=0; i<contexts.size(); ++i) {
-            const QGLContext *ctx = contexts.at(i);
-            if (ctx != context && QGLContext::areSharing(context, ctx)) {
-                context_key = ctx;
-                dev_it = qt_context_cache.constFind(context_key);
-                break;
-            }
-        }
-    }
-
-    if (dev_it == qt_context_cache.constEnd()) {
-        // no shared contexts either - create a new entry
-        font_cache = new QGLFontGlyphHash;
-//         qDebug() << "new context" << context << font_cache;
-        qt_context_cache.insert(context, font_cache);
-        if (context->isValid()) {
-            if (context->device() && context->device()->devType() == QInternal::Widget) {
-                QWidget *widget = static_cast<QWidget *>(context->device());
-                connect(widget, SIGNAL(destroyed(QObject*)), SLOT(widgetDestroyed(QObject*)));
-            }
-            connect(QGLSignalProxy::instance(),
-                    SIGNAL(aboutToDestroyContext(const QGLContext*)),
-                    SLOT(cleanupContext(const QGLContext*)));
-        }
-    } else {
-        font_cache = dev_it.value();
-    }
-    Q_ASSERT(font_cache != 0);
-
-    QGLFontGlyphHash::const_iterator cache_it = font_cache->constFind(fontEngine);
-    QGLGlyphHash *cache = 0;
-    if (cache_it == font_cache->constEnd()) {
-        cache = new QGLGlyphHash;
-        font_cache->insert(fontEngine, cache);
-        connect(fontEngine, SIGNAL(destroyed(QObject*)), SLOT(fontEngineDestroyed(QObject*)));
-    } else {
-        cache = cache_it.value();
-    }
-    current_cache = cache;
-
-    quint64 font_key = (reinterpret_cast<quint64>(context_key ? context_key : context) << 32)
-                       | reinterpret_cast<quint64>(fontEngine);
-    QGLFontTexHash::const_iterator it = qt_font_textures.constFind(font_key);
-    QGLFontTexture *font_tex;
-    if (it == qt_font_textures.constEnd()) {
-        GLuint font_texture;
-        glGenTextures(1, &font_texture);
-        GLint tex_height = qt_next_power_of_two(qRound(fontEngine->ascent().toReal() + fontEngine->descent().toReal())+2);
-        GLint tex_width = qt_next_power_of_two(tex_height*30); // ###
-        GLint max_tex_size;
-        glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_tex_size);
-        Q_ASSERT(max_tex_size > 0);
-        if (tex_width > max_tex_size)
-            tex_width = max_tex_size;
-        allocTexture(tex_width, tex_height, font_texture);
-        font_tex = new QGLFontTexture;
-        font_tex->texture = font_texture;
-        font_tex->x_offset = x_margin;
-        font_tex->y_offset = y_margin;
-        font_tex->width = tex_width;
-        font_tex->height = tex_height;
-//         qDebug() << "new font tex - width:" << tex_width << "height:"<< tex_height
-//                  << hex << "tex id:" << font_tex->texture << "key:" << font_key << "num cached:" << qt_font_textures.size();
-        qt_font_textures.insert(font_key, font_tex);
-    } else {
-        font_tex = it.value();
-        glBindTexture(GL_TEXTURE_2D, font_tex->texture);
-    }
-
-    for (int i=0; i< numGlyphs; ++i) {
-        QGLGlyphHash::const_iterator it = cache->constFind(glyphs[i]);
-        if (it == cache->constEnd()) {
-            // render new glyph and put it in the cache
-            glyph_metrics_t metrics = fontEngine->boundingBox(glyphs[i]);
-            int glyph_width = qRound(metrics.width.toReal())+2;
-            int glyph_height = qRound(fontEngine->ascent().toReal() + fontEngine->descent().toReal())+2;
-
-            if (font_tex->x_offset + glyph_width + x_margin > font_tex->width) {
-                int strip_height = qt_next_power_of_two(qRound(fontEngine->ascent().toReal() + fontEngine->descent().toReal())+2);
-                font_tex->x_offset = x_margin;
-                font_tex->y_offset += strip_height;
-                if (font_tex->y_offset >= font_tex->height) {
-                    // get hold of the old font texture
-                    uchar *old_tex_data = (uchar *) malloc(font_tex->width*font_tex->height*2);
-                    int old_tex_height = font_tex->height;
-#ifndef QT_OPENGL_ES
-                    glGetTexImage(GL_TEXTURE_2D, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, old_tex_data);
-#endif
-
-                    // realloc a larger texture
-                    glDeleteTextures(1, &font_tex->texture);
-                    glGenTextures(1, &font_tex->texture);
-                    font_tex->height = qt_next_power_of_two(font_tex->height + strip_height);
-                    allocTexture(font_tex->width, font_tex->height, font_tex->texture);
-
-                    // write back the old texture data
-                    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, font_tex->width, old_tex_height,
-                                    GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, old_tex_data);
-                    free(old_tex_data);
-
-                    // update the texture coords and the y offset for the existing glyphs in
-                    // the cache, because of the texture size change
-                    QGLGlyphHash::iterator it = cache->begin();
-                    while (it != cache->end()) {
-                        it.value()->height = (it.value()->height * old_tex_height) / font_tex->height;
-                        it.value()->y = (it.value()->y * old_tex_height) / font_tex->height;
-                        ++it;
-                    }
-                }
-            }
-
-            QImage glyph_im(fontEngine->alphaMapForGlyph(glyphs[i]));
-            glyph_width = glyph_im.width();
-            Q_ASSERT(glyph_width >= 0);
-            // pad the glyph width to an even number
-            if (glyph_width%2 != 0)
-                ++glyph_width;
-
-            QGLGlyphCoord *qgl_glyph = new QGLGlyphCoord;
-            qgl_glyph->x = qreal(font_tex->x_offset) / font_tex->width;
-            qgl_glyph->y = qreal(font_tex->y_offset) / font_tex->height;
-            qgl_glyph->width = qreal(glyph_width) / font_tex->width;
-            qgl_glyph->height = qreal(glyph_height) / font_tex->height;
-            qgl_glyph->log_width = qreal(glyph_width);
-            qgl_glyph->log_height = qgl_glyph->height * font_tex->height;
-#ifdef Q_WS_MAC
-            qgl_glyph->x_offset = -metrics.x + 1;
-            qgl_glyph->y_offset = metrics.y - 2;
-#else
-            qgl_glyph->x_offset = -metrics.x;
-            qgl_glyph->y_offset = metrics.y;
-#endif
-
-            if (!glyph_im.isNull()) {
-                int idx = 0;
-                uchar *tex_data = (uchar *) malloc(glyph_width*glyph_im.height()*2);
-                memset(tex_data, 0, glyph_width*glyph_im.height()*2);
-
-                bool is8BitGray = false;
-#ifdef Q_WS_QPA
-                if (glyph_im.format() == QImage::Format_Indexed8) {
-                    is8BitGray = true;
-                }
-#endif
-                glyph_im = glyph_im.convertToFormat(QImage::Format_Indexed8);
-                for (int y=0; y<glyph_im.height(); ++y) {
-                    uchar *s = (uchar *) glyph_im.scanLine(y);
-                    for (int x=0; x<glyph_im.width(); ++x) {
-                        uchar alpha = is8BitGray ? *s : qAlpha(glyph_im.color(*s));
-                        tex_data[idx] = alpha;
-                        tex_data[idx+1] = alpha;
-                        ++s;
-                        idx += 2;
-                    }
-                    if (glyph_im.width()%2 != 0)
-                        idx += 2;
-                }
-                glTexSubImage2D(GL_TEXTURE_2D, 0, font_tex->x_offset, font_tex->y_offset,
-                                glyph_width, glyph_im.height(),
-                                GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, tex_data);
-                free(tex_data);
-            }
-            if (font_tex->x_offset + glyph_width + x_margin > font_tex->width) {
-                font_tex->x_offset = x_margin;
-                font_tex->y_offset += glyph_height + y_margin;
-            } else {
-                font_tex->x_offset += glyph_width + x_margin;
-            }
-
-            cache->insert(glyphs[i], qgl_glyph);
-        }
-    }
-}
-
-QGLGlyphCoord *QGLGlyphCache::lookup(QFontEngine *, glyph_t g)
-{
-    Q_ASSERT(current_cache != 0);
-    // ### careful here
-    QGLGlyphHash::const_iterator it = current_cache->constFind(g);
-    if (it == current_cache->constEnd())
-        return 0;
-    else
-        return it.value();
-}
-
-Q_GLOBAL_STATIC(QGLGlyphCache, qt_glyph_cache)
-
-//
-// assumption: the context that this is called for has to be the
-// current context
-//
-void qgl_cleanup_glyph_cache(QGLContext *ctx)
-{
-    qt_glyph_cache()->cleanupContext(ctx);
-}
-
-void QOpenGLPaintEngine::drawStaticTextItem(QStaticTextItem *textItem)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    d->flushDrawQueue();
-
-    // make sure the glyphs we want to draw are in the cache
-    qt_glyph_cache()->cacheGlyphs(d->device->context(), textItem->fontEngine(), textItem->glyphs,
-                                  textItem->numGlyphs);
-
-    d->setGradientOps(Qt::SolidPattern, QRectF()); // turns off gradient ops
-    qt_glColor4ubv(d->pen_color);
-    glEnable(GL_TEXTURE_2D);
-
-#ifdef Q_WS_QWS
-    // XXX: it is necessary to disable alpha writes on GLES/embedded because we don't want
-    // text rendering to update the alpha in the window surface.
-    // XXX: This may not be needed as this behavior does seem to be caused by driver bug
-    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_FALSE);
-#endif
-
-    // do the actual drawing
-    GLfloat vertexArray[4*2];
-    GLfloat texCoordArray[4*2];
-
-    glVertexPointer(2, GL_FLOAT, 0, vertexArray);
-    glTexCoordPointer(2, GL_FLOAT, 0, texCoordArray);
-
-    glEnableClientState(GL_VERTEX_ARRAY);
-    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
-    bool antialias = !(textItem->fontEngine()->fontDef.styleStrategy & QFont::NoAntialias)
-				   && (d->matrix.type() > QTransform::TxTranslate);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, antialias ? GL_LINEAR : GL_NEAREST);
-    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, antialias ? GL_LINEAR : GL_NEAREST);
-
-    for (int i=0; i< textItem->numGlyphs; ++i) {
-        QGLGlyphCoord *g = qt_glyph_cache()->lookup(textItem->fontEngine(), textItem->glyphs[i]);
-
-        // we don't cache glyphs with no width/height
-        if (!g)
-            continue;
-
-        qreal x1, x2, y1, y2;
-        x1 = g->x;
-        y1 = g->y;
-        x2 = x1 + g->width;
-        y2 = y1 + g->height;
-
-        QPointF logical_pos((textItem->glyphPositions[i].x - g->x_offset).toReal(),
-                            (textItem->glyphPositions[i].y + g->y_offset).toReal());
-
-        qt_add_rect_to_array(QRectF(logical_pos, QSizeF(g->log_width, g->log_height)), vertexArray);
-        qt_add_texcoords_to_array(x1, y1, x2, y2, texCoordArray);
-
-        glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-    }
-
-    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
-    glDisableClientState(GL_VERTEX_ARRAY);
-
-    glDisable(GL_TEXTURE_2D);
-
-#ifdef Q_WS_QWS
-    // XXX: This may not be needed as this behavior does seem to be caused by driver bug
-    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-#endif
-
-}
-
-void QOpenGLPaintEngine::drawTextItem(const QPointF &p, const QTextItem &textItem)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    const QTextItemInt &ti = static_cast<const QTextItemInt &>(textItem);
-
-    // fall back to drawing a polygon if the scale factor is large, or
-    // we use a gradient pen
-    if ((d->matrix.det() > 1) || (d->pen_brush_style >= Qt::LinearGradientPattern
-                                  && d->pen_brush_style <= Qt::ConicalGradientPattern)) {
-        QPaintEngine::drawTextItem(p, textItem);
-        return;
-    }
-
-    // add the glyphs used to the glyph texture cache
-    QVarLengthArray<QFixedPoint> positions;
-    QVarLengthArray<glyph_t> glyphs;
-    QTransform matrix = QTransform::fromTranslate(qRound(p.x()), qRound(p.y()));
-    ti.fontEngine->getGlyphPositions(ti.glyphs, matrix, ti.flags, glyphs, positions);
-
-    {
-        QStaticTextItem staticTextItem;
-        staticTextItem.chars = const_cast<QChar *>(ti.chars);
-        staticTextItem.setFontEngine(ti.fontEngine);
-        staticTextItem.glyphs = glyphs.data();
-        staticTextItem.numChars = ti.num_chars;
-        staticTextItem.numGlyphs = glyphs.size();
-        staticTextItem.glyphPositions = positions.data();
-        drawStaticTextItem(&staticTextItem);
-    }
-
-}
-
-
-void QOpenGLPaintEngine::drawEllipse(const QRectF &rect)
-{
-#ifndef Q_WS_QWS
-    Q_D(QOpenGLPaintEngine);
-
-    if (d->use_emulation) {
-        QPaintEngineEx::drawEllipse(rect);
-        return;
-    }
-
-    if (d->high_quality_antialiasing) {
-        if (d->has_brush) {
-            d->disableClipping();
-
-            glMatrixMode(GL_MODELVIEW);
-            glPushMatrix();
-            glLoadIdentity();
-
-            GLuint program = qt_gl_program_cache()->getProgram(d->device->context(),
-                                                               FRAGMENT_PROGRAM_MASK_ELLIPSE_AA, 0, true);
-            QGLEllipseMaskGenerator maskGenerator(rect,
-                                                  d->matrix,
-                                                  d->offscreen,
-                                                  program,
-                                                  mask_variable_locations[FRAGMENT_PROGRAM_MASK_ELLIPSE_AA]);
-
-            d->addItem(qt_mask_texture_cache()->getMask(maskGenerator, d));
-
-            d->enableClipping();
-
-            glMatrixMode(GL_MODELVIEW);
-            glPopMatrix();
-        }
-
-        if (d->has_pen) {
-            QPainterPath path;
-            path.addEllipse(rect);
-
-            d->strokePath(path, false);
-        }
-    } else {
-        DEBUG_ONCE_STR("QOpenGLPaintEngine::drawEllipse(): falling back to drawPath()");
-
-        QPainterPath path;
-        path.addEllipse(rect);
-        drawPath(path);
-    }
-#else
-    QPaintEngineEx::drawEllipse(rect);
-#endif
-}
-
-
-void QOpenGLPaintEnginePrivate::updateFragmentProgramData(int locations[])
-{
-#ifdef Q_WS_QWS
-    Q_UNUSED(locations);
-#else
-    QGL_FUNC_CONTEXT;
-
-    QSize sz = offscreen.offscreenSize();
-
-    float inv_mask_size_data[4] = { 1.0f / sz.width(), 1.0f / sz.height(), 0.0f, 0.0f };
-
-    sz = drawable_texture_size;
-
-    float inv_dst_size_data[4] = { 1.0f / sz.width(), 1.0f / sz.height(), 0.0f, 0.0f };
-
-    // default inv size 0.125f == 1.0f / 8.0f for pattern brushes
-    float inv_brush_texture_size_data[4] = { 0.125f, 0.125f };
-
-    // texture patterns have their own size
-    if (current_style == Qt::TexturePattern) {
-        QSize sz = cbrush.texture().size();
-
-        inv_brush_texture_size_data[0] = 1.0f / sz.width();
-        inv_brush_texture_size_data[1] = 1.0f / sz.height();
-    }
-
-    for (unsigned int i = 0; i < num_fragment_variables; ++i) {
-        int location = locations[i];
-
-        if (location < 0)
-            continue;
-
-        switch (i) {
-        case VAR_ANGLE:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, angle_data);
-            break;
-        case VAR_LINEAR:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, linear_data);
-            break;
-        case VAR_FMP:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, fmp_data);
-            break;
-        case VAR_FMP2_M_RADIUS2:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, fmp2_m_radius2_data);
-            break;
-        case VAR_INV_MASK_SIZE:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, inv_mask_size_data);
-            break;
-        case VAR_INV_DST_SIZE:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, inv_dst_size_data);
-            break;
-        case VAR_INV_MATRIX_M0:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, inv_matrix_data[0]);
-            break;
-        case VAR_INV_MATRIX_M1:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, inv_matrix_data[1]);
-            break;
-        case VAR_INV_MATRIX_M2:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, inv_matrix_data[2]);
-            break;
-        case VAR_PORTERDUFF_AB:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, porterduff_ab_data);
-            break;
-        case VAR_PORTERDUFF_XYZ:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, porterduff_xyz_data);
-            break;
-        case VAR_INV_BRUSH_TEXTURE_SIZE:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, inv_brush_texture_size_data);
-            break;
-        case VAR_MASK_OFFSET:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, mask_offset_data);
-            break;
-        case VAR_MASK_CHANNEL:
-            glProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, location, mask_channel_data);
-            break;
-        case VAR_DST_TEXTURE:
-        case VAR_MASK_TEXTURE:
-        case VAR_PALETTE:
-        case VAR_BRUSH_TEXTURE:
-            // texture variables, not handled here
-            break;
-        default:
-            qDebug() << "QOpenGLPaintEnginePrivate: Unhandled fragment variable:" << i;
-        }
-    }
-#endif
-}
-
-
-void QOpenGLPaintEnginePrivate::copyDrawable(const QRectF &rect)
-{
-#ifdef Q_WS_QWS
-    Q_UNUSED(rect);
-#else
-    ensureDrawableTexture();
-
-    DEBUG_ONCE qDebug() << "Refreshing drawable_texture for rectangle" << rect;
-    QRectF screen_rect = rect.adjusted(-1, -1, 1, 1);
-
-    int left = qMax(0, static_cast<int>(screen_rect.left()));
-    int width = qMin(device->size().width() - left, static_cast<int>(screen_rect.width()) + 1);
-
-    int bottom = qMax(0, static_cast<int>(device->size().height() - screen_rect.bottom()));
-    int height = qMin(device->size().height() - bottom, static_cast<int>(screen_rect.height()) + 1);
-
-    glBindTexture(GL_TEXTURE_2D, drawable_texture);
-    glCopyTexSubImage2D(GL_TEXTURE_2D, 0, left, bottom, left, bottom, width, height);
-#endif
-}
-
-
-void QOpenGLPaintEnginePrivate::composite(const QRectF &rect, const QPoint &maskOffset)
-{
-#ifdef Q_WS_QWS
-    Q_UNUSED(rect);
-    Q_UNUSED(maskOffset);
-#else
-    GLfloat vertexArray[8];
-    qt_add_rect_to_array(rect, vertexArray);
-
-    composite(GL_TRIANGLE_FAN, vertexArray, 4, maskOffset);
-#endif
-}
-
-
-void QOpenGLPaintEnginePrivate::composite(GLuint primitive, const GLfloat *vertexArray, int vertexCount, const QPoint &maskOffset)
-{
-#ifdef QT_OPENGL_ES
-    Q_UNUSED(primitive);
-    Q_UNUSED(vertexArray);
-    Q_UNUSED(vertexCount);
-    Q_UNUSED(maskOffset);
-#else
-    Q_Q(QOpenGLPaintEngine);
-    QGL_FUNC_CONTEXT;
-
-    if (current_style == Qt::NoBrush)
-        return;
-
-    DEBUG_ONCE qDebug() << "QOpenGLPaintEnginePrivate: Using compositing program: fragment_brush ="
-                        << fragment_brush << ", fragment_composition_mode =" << fragment_composition_mode;
-
-    if (has_fast_composition_mode)
-        q->updateCompositionMode(composition_mode);
-    else {
-        qreal minX = 1e9, minY = 1e9, maxX = -1e9, maxY = -1e9;
-
-        for (int i = 0; i < vertexCount; ++i) {
-            qreal x = vertexArray[2 * i];
-            qreal y = vertexArray[2 * i + 1];
-
-            qreal tx, ty;
-            matrix.map(x, y, &tx, &ty);
-
-            minX = qMin(minX, tx);
-            minY = qMin(minY, ty);
-            maxX = qMax(maxX, tx);
-            maxY = qMax(maxY, ty);
-        }
-
-        QRectF r(minX, minY, maxX - minX, maxY - minY);
-        copyDrawable(r);
-
-        glBlendFunc(GL_ONE, GL_ZERO);
-    }
-
-    int *locations = painter_variable_locations[fragment_brush][fragment_composition_mode];
-
-    int texture_locations[] = { locations[VAR_DST_TEXTURE],
-                                locations[VAR_MASK_TEXTURE],
-                                locations[VAR_PALETTE] };
-
-    int brush_texture_location = locations[VAR_BRUSH_TEXTURE];
-
-    GLuint texture_targets[] = { GL_TEXTURE_2D,
-                                 GL_TEXTURE_2D,
-                                 GL_TEXTURE_1D };
-
-    GLuint textures[] = { drawable_texture,
-                          offscreen.offscreenTexture(),
-                          grad_palette };
-
-    const int num_textures = sizeof(textures) / sizeof(*textures);
-
-    Q_ASSERT(num_textures == sizeof(texture_locations) / sizeof(*texture_locations));
-    Q_ASSERT(num_textures == sizeof(texture_targets) / sizeof(*texture_targets));
-
-    for (int i = 0; i < num_textures; ++i)
-        if (texture_locations[i] >= 0) {
-            glActiveTexture(GL_TEXTURE0 + texture_locations[i]);
-            glBindTexture(texture_targets[i], textures[i]);
-        }
-
-    if (brush_texture_location >= 0) {
-        glActiveTexture(GL_TEXTURE0 + brush_texture_location);
-
-        if (current_style == Qt::TexturePattern)
-            device->context()->d_func()->bindTexture(cbrush.textureImage(), GL_TEXTURE_2D, GL_RGBA,
-                                                     QGLContext::InternalBindOption);
-        else
-            device->context()->d_func()->bindTexture(qt_imageForBrush(current_style, false),
-                                                     GL_TEXTURE_2D, GL_RGBA,
-                                                     QGLContext::InternalBindOption);
-
-        updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, use_smooth_pixmap_transform);
-    }
-
-    glEnableClientState(GL_VERTEX_ARRAY);
-    glVertexPointer(2, GL_FLOAT, 0, vertexArray);
-    glEnable(GL_FRAGMENT_PROGRAM_ARB);
-    GLuint program = qt_gl_program_cache()->getProgram(device->context(),
-                                                       fragment_brush,
-                                                       fragment_composition_mode, false);
-    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, program);
-
-    mask_offset_data[0] = maskOffset.x();
-    mask_offset_data[1] = -maskOffset.y();
-
-    updateFragmentProgramData(locations);
-
-    glDrawArrays(primitive, 0, vertexCount);
-
-    glDisable(GL_FRAGMENT_PROGRAM_ARB);
-    glDisableClientState(GL_VERTEX_ARRAY);
-
-    for (int i = 0; i < num_textures; ++i)
-        if (texture_locations[i] >= 0) {
-            glActiveTexture(GL_TEXTURE0 + texture_locations[i]);
-            glBindTexture(texture_targets[i], 0);
-        }
-
-    if (brush_texture_location >= 0) {
-        glActiveTexture(GL_TEXTURE0 + brush_texture_location);
-        glBindTexture(GL_TEXTURE_2D, 0);
-    }
-
-    glActiveTexture(GL_TEXTURE0);
-
-    if (!has_fast_composition_mode)
-        q->updateCompositionMode(composition_mode);
-#endif
-}
-
-void QOpenGLPaintEnginePrivate::cacheItemErased(int channel, const QRect &rect)
-{
-    bool isInDrawQueue = false;
-
-    foreach (const QDrawQueueItem &item, drawQueue) {
-        if (item.location.channel == channel && item.location.rect == rect) {
-            isInDrawQueue = true;
-            break;
-        }
-    }
-
-    if (isInDrawQueue)
-        flushDrawQueue();
-}
-
-void QOpenGLPaintEnginePrivate::addItem(const QGLMaskTextureCache::CacheLocation &location)
-{
-    drawQueue << QDrawQueueItem(opacity, cbrush, brush_origin, composition_mode, matrix, location);
-}
-
-void QOpenGLPaintEnginePrivate::drawItem(const QDrawQueueItem &item)
-{
-    Q_Q(QOpenGLPaintEngine);
-
-    opacity = item.opacity;
-    brush_origin = item.brush_origin;
-    q->updateCompositionMode(item.composition_mode);
-    matrix = item.matrix;
-    cbrush = item.brush;
-    brush_style = item.brush.style();
-
-    mask_channel_data[0] = item.location.channel == 0;
-    mask_channel_data[1] = item.location.channel == 1;
-    mask_channel_data[2] = item.location.channel == 2;
-    mask_channel_data[3] = item.location.channel == 3;
-
-    setGradientOps(item.brush, item.location.screen_rect);
-
-    composite(item.location.screen_rect, item.location.rect.topLeft() - item.location.screen_rect.topLeft()
-                                         - QPoint(0, offscreen.offscreenSize().height() - device->size().height()));
-}
-
-void QOpenGLPaintEnginePrivate::flushDrawQueue()
-{
-#ifndef QT_OPENGL_ES
-    Q_Q(QOpenGLPaintEngine);
-
-    offscreen.release();
-
-    if (!drawQueue.isEmpty()) {
-        DEBUG_ONCE qDebug() << "QOpenGLPaintEngine::flushDrawQueue():" << drawQueue.size() << "items";
-
-        glPushMatrix();
-        glLoadIdentity();
-        qreal old_opacity = opacity;
-        QPointF old_brush_origin = brush_origin;
-        QPainter::CompositionMode old_composition_mode = composition_mode;
-        QTransform old_matrix = matrix;
-        QBrush old_brush = cbrush;
-
-        bool hqaa_old = high_quality_antialiasing;
-
-        high_quality_antialiasing = true;
-
-        foreach (const QDrawQueueItem &item, drawQueue)
-            drawItem(item);
-
-        opacity = old_opacity;
-        brush_origin = old_brush_origin;
-        q->updateCompositionMode(old_composition_mode);
-        matrix = old_matrix;
-        cbrush = old_brush;
-        brush_style = old_brush.style();
-
-        high_quality_antialiasing = hqaa_old;
-
-        setGLBrush(old_brush.color());
-        qt_glColor4ubv(brush_color);
-
-        drawQueue.clear();
-
-        glPopMatrix();
-    }
-#endif
-}
-
-void QOpenGLPaintEngine::clipEnabledChanged()
-{
-    Q_D(QOpenGLPaintEngine);
-
-    d->updateDepthClip();
-}
-
-void QOpenGLPaintEngine::penChanged()
-{
-    updatePen(state()->pen);
-}
-
-void QOpenGLPaintEngine::brushChanged()
-{
-    updateBrush(state()->brush, state()->brushOrigin);
-}
-
-void QOpenGLPaintEngine::brushOriginChanged()
-{
-    updateBrush(state()->brush, state()->brushOrigin);
-}
-
-void QOpenGLPaintEngine::opacityChanged()
-{
-    Q_D(QOpenGLPaintEngine);
-    QPainterState *s = state();
-    d->opacity = s->opacity;
-    updateBrush(s->brush, s->brushOrigin);
-    updatePen(s->pen);
-}
-
-void QOpenGLPaintEngine::compositionModeChanged()
-{
-    updateCompositionMode(state()->composition_mode);
-}
-
-void QOpenGLPaintEngine::renderHintsChanged()
-{
-    updateRenderHints(state()->renderHints);
-}
-
-void QOpenGLPaintEngine::transformChanged()
-{
-    updateMatrix(state()->matrix);
-}
-
-extern QPainterPath qt_painterPathFromVectorPath(const QVectorPath &path);
-
-void QOpenGLPaintEngine::fill(const QVectorPath &path, const QBrush &brush)
-{
-    Q_D(QOpenGLPaintEngine);
-
-    if (brush.style() == Qt::NoBrush)
-        return;
-
-    if ((!d->use_fragment_programs && needsEmulation(brush.style())) || qt_isExtendedRadialGradient(brush)) {
-        QPainter *p = painter();
-        QBrush oldBrush = p->brush();
-        p->setBrush(brush);
-        qt_draw_helper(p->d_ptr.data(), qt_painterPathFromVectorPath(path), QPainterPrivate::FillDraw);
-        p->setBrush(oldBrush);
-        return;
-    }
-
-    QBrush old_brush = state()->brush;
-    updateBrush(brush, state()->brushOrigin);
-
-    const qreal *points = path.points();
-    const QPainterPath::ElementType *types = path.elements();
-    if (!types && path.shape() == QVectorPath::RectangleHint) {
-        QRectF r(points[0], points[1], points[4]-points[0], points[5]-points[1]);
-        QPen old_pen = state()->pen;
-        updatePen(Qt::NoPen);
-        drawRects(&r, 1);
-        updatePen(old_pen);
-    } else {
-        d->fillPath(qt_painterPathFromVectorPath(path));
-    }
-
-    updateBrush(old_brush, state()->brushOrigin);
-}
-
-template <typename T> static inline bool isRect(const T *pts, int elementCount) {
-    return (elementCount == 5 // 5-point polygon, check for closed rect
-            && pts[0] == pts[8] && pts[1] == pts[9] // last point == first point
-            && pts[0] == pts[6] && pts[2] == pts[4] // x values equal
-            && pts[1] == pts[3] && pts[5] == pts[7] // y values equal...
-            ) ||
-           (elementCount == 4 // 4-point polygon, check for unclosed rect
-            && pts[0] == pts[6] && pts[2] == pts[4] // x values equal
-            && pts[1] == pts[3] && pts[5] == pts[7] // y values equal...
-            );
-}
-
-void QOpenGLPaintEngine::clip(const QVectorPath &path, Qt::ClipOperation op)
-{
-    const qreal *points = path.points();
-    const QPainterPath::ElementType *types = path.elements();
-    if (!types && path.shape() == QVectorPath::RectangleHint) {
-        QRectF r(points[0], points[1], points[4]-points[0], points[5]-points[1]);
-        updateClipRegion(QRegion(r.toRect()), op);
-        return;
-    }
-
-    QPainterPath p;
-    if (types) {
-        int id = 0;
-        for (int i=0; i<path.elementCount(); ++i) {
-            switch(types[i]) {
-            case QPainterPath::MoveToElement:
-                p.moveTo(QPointF(points[id], points[id+1]));
-                id+=2;
-                break;
-            case QPainterPath::LineToElement:
-                p.lineTo(QPointF(points[id], points[id+1]));
-                id+=2;
-                break;
-            case QPainterPath::CurveToElement: {
-                QPointF p1(points[id], points[id+1]);
-                QPointF p2(points[id+2], points[id+3]);
-                QPointF p3(points[id+4], points[id+5]);
-                p.cubicTo(p1, p2, p3);
-                id+=6;
-                break;
-            }
-            case QPainterPath::CurveToDataElement:
-                ;
-                break;
-            }
-        }
-    } else if (!path.isEmpty()) {
-        p.moveTo(QPointF(points[0], points[1]));
-        int id = 2;
-        for (int i=1; i<path.elementCount(); ++i) {
-            p.lineTo(QPointF(points[id], points[id+1]));
-            id+=2;
-        }
-    }
-    if (path.hints() & QVectorPath::WindingFill)
-        p.setFillRule(Qt::WindingFill);
-
-    updateClipRegion(QRegion(p.toFillPolygon().toPolygon(), p.fillRule()), op);
-    return;
-}
-
-void QOpenGLPaintEngine::setState(QPainterState *s)
-{
-    Q_D(QOpenGLPaintEngine);
-    QOpenGLPaintEngineState *new_state = static_cast<QOpenGLPaintEngineState *>(s);
-    QOpenGLPaintEngineState *old_state = state();
-
-    QPaintEngineEx::setState(s);
-
-    // are we in a save() ?
-    if (s == d->last_created_state) {
-        d->last_created_state = 0;
-        return;
-    }
-
-    if (isActive()) {
-        if (old_state->depthClipId != new_state->depthClipId)
-            d->updateDepthClip();
-        penChanged();
-        brushChanged();
-        opacityChanged();
-        compositionModeChanged();
-        renderHintsChanged();
-        transformChanged();
-    }
-}
-
-QPainterState *QOpenGLPaintEngine::createState(QPainterState *orig) const
-{
-    const Q_D(QOpenGLPaintEngine);
-
-    QOpenGLPaintEngineState *s;
-    if (!orig)
-        s = new QOpenGLPaintEngineState();
-    else
-        s = new QOpenGLPaintEngineState(*static_cast<QOpenGLPaintEngineState *>(orig));
-
-    d->last_created_state = s;
-    return s;
-}
-
-//
-//  QOpenGLPaintEngineState
-//
-
-QOpenGLPaintEngineState::QOpenGLPaintEngineState(QOpenGLPaintEngineState &other)
-    : QPainterState(other)
-{
-    clipRegion = other.clipRegion;
-    hasClipping = other.hasClipping;
-    fastClip = other.fastClip;
-    depthClipId = other.depthClipId;
-}
-
-QOpenGLPaintEngineState::QOpenGLPaintEngineState()
-{
-    hasClipping = false;
-    depthClipId = 0;
-}
-
-QOpenGLPaintEngineState::~QOpenGLPaintEngineState()
-{
-}
-
-void QOpenGLPaintEnginePrivate::ensureDrawableTexture()
-{
-    if (!dirty_drawable_texture)
-        return;
-
-    dirty_drawable_texture = false;
-
-#ifndef QT_OPENGL_ES
-    glGenTextures(1, &drawable_texture);
-    glBindTexture(GL_TEXTURE_2D, drawable_texture);
-
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8,
-            drawable_texture_size.width(),
-            drawable_texture_size.height(), 0,
-            GL_RGBA, GL_UNSIGNED_BYTE, NULL);
-
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-#endif
-}
-
-QT_END_NAMESPACE
-
-#include "qpaintengine_opengl.moc"