Source/WebCore/plugins/qt/PluginViewQt.cpp

/*
 * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.
 * Copyright (C) 2008 Collabora Ltd. All rights reserved.
 * Copyright (C) 2009 Girish Ramakrishnan <girish@forwardbias.in>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "PluginView.h"

#if USE(JSC)
#include "BridgeJSC.h"
#endif
#include "Chrome.h"
#include "ChromeClient.h"
#include "Document.h"
#include "DocumentLoader.h"
#include "Element.h"
#include "FloatPoint.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameLoadRequest.h"
#include "FrameLoader.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "HTMLNames.h"
#include "HTMLPlugInElement.h"
#include "HostWindow.h"
#include "IFrameShimSupport.h"
#include "Image.h"
#if USE(JSC)
#include "JSDOMBinding.h"
#endif
#include "KeyboardEvent.h"
#include "MouseEvent.h"
#include "NotImplemented.h"
#include "Page.h"
#include "PlatformMouseEvent.h"
#include "PlatformKeyboardEvent.h"
#include "PluginContainerQt.h"
#include "PluginDebug.h"
#include "PluginPackage.h"
#include "PluginMainThreadScheduler.h"
#include "QWebPageClient.h"
#include "RenderLayer.h"
#include "ScriptController.h"
#include "Settings.h"
#include "npruntime_impl.h"
#include "qwebpage_p.h"
#if USE(JSC)
#include "runtime_root.h"
#endif

#include <QApplication>
#include <QDesktopWidget>
#include <QGraphicsWidget>
#include <QKeyEvent>
#include <QPainter>
#include <QStyleOptionGraphicsItem>
#include <QWidget>
#include <QX11Info>
#include <X11/X.h>
#ifndef QT_NO_XRENDER
#define Bool int
#define Status int
#include <X11/extensions/Xrender.h>
#endif
#include <runtime/JSLock.h>
#include <runtime/JSValue.h>

using JSC::ExecState;
#if USE(JSC)
using JSC::Interpreter;
#endif
using JSC::JSLock;
using JSC::JSObject;
using JSC::UString;

using std::min;

using namespace WTF;

namespace WebCore {

using namespace HTMLNames;

#if USE(ACCELERATED_COMPOSITING)
// Qt's GraphicsLayer (GraphicsLayerQt) requires layers to be QGraphicsWidgets
class PluginGraphicsLayerQt : public QGraphicsWidget {
public:
    PluginGraphicsLayerQt(PluginView* view) : m_view(view) { }
    ~PluginGraphicsLayerQt() { }

    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0)
    {
        Q_UNUSED(widget);
        m_view->paintUsingXPixmap(painter, option->exposedRect.toRect());
    }

private:
    PluginView* m_view;
};
#endif

void PluginView::updatePluginWidget()
{
    if (!parent())
        return;

    ASSERT(parent()->isFrameView());
    FrameView* frameView = static_cast<FrameView*>(parent());

    IntRect oldWindowRect = m_windowRect;
    IntRect oldClipRect = m_clipRect;

    m_windowRect = IntRect(frameView->contentsToWindow(frameRect().location()), frameRect().size());
    m_clipRect = windowClipRect();
    m_clipRect.move(-m_windowRect.x(), -m_windowRect.y());

    if (m_windowRect == oldWindowRect && m_clipRect == oldClipRect)
        return;

    // The plugin had a zero width or height before but was resized, we need to show it again.
    if (oldWindowRect.isEmpty())
        show();

    if (!m_isWindowed && m_windowRect.size() != oldWindowRect.size()) {
#if defined(MOZ_PLATFORM_MAEMO) && (MOZ_PLATFORM_MAEMO >= 5)
        // On Maemo5, Flash always renders to 16-bit buffer
        if (m_renderToImage)
            m_image = QImage(m_windowRect.width(), m_windowRect.height(), QImage::Format_RGB16);
        else
#endif
        {
            if (m_drawable)
                XFreePixmap(QX11Info::display(), m_drawable);

            m_drawable = XCreatePixmap(QX11Info::display(), QX11Info::appRootWindow(), m_windowRect.width(), m_windowRect.height(), 
                                       ((NPSetWindowCallbackStruct*)m_npWindow.ws_info)->depth);
            QApplication::syncX(); // make sure that the server knows about the Drawable
        }
    }

    // do not call setNPWindowIfNeeded immediately, will be called on paint()
    m_hasPendingGeometryChange = true;

    // (i) in order to move/resize the plugin window at the same time as the
    // rest of frame during e.g. scrolling, we set the window geometry
    // in the paint() function, but as paint() isn't called when the
    // plugin window is outside the frame which can be caused by a
    // scroll, we need to move/resize immediately.
    // (ii) if we are running layout tests from DRT, paint() won't ever get called
    // so we need to call setNPWindowIfNeeded() if window geometry has changed
    if (!m_windowRect.intersects(frameView->frameRect())
        || (QWebPagePrivate::drtRun && platformPluginWidget() && (m_windowRect != oldWindowRect || m_clipRect != oldClipRect)))
        setNPWindowIfNeeded();

    if (!m_platformLayer) {
        // Make sure we get repainted afterwards. This is necessary for downward
        // scrolling to move the plugin widget properly.
        // Note that we don't invalidate the frameRect() here. This is because QWebFrame::renderRelativeCoords()
        // imitates ScrollView and adds the scroll offset back on to the rect we damage here (making the co-ordinates absolute
        // to the frame again) before passing it to FrameView.
        invalidate();
    }
}

void PluginView::setFocus(bool focused)
{
    if (platformPluginWidget()) {
        if (focused)
            platformPluginWidget()->setFocus(Qt::OtherFocusReason);
    } else {
        Widget::setFocus(focused);
    }
}

void PluginView::show()
{
    Q_ASSERT(platformPluginWidget() == platformWidget());
    Widget::show();
}

void PluginView::hide()
{
    Q_ASSERT(platformPluginWidget() == platformWidget());
    Widget::hide();
}

#if defined(MOZ_PLATFORM_MAEMO) && (MOZ_PLATFORM_MAEMO >= 5)
void PluginView::paintUsingImageSurfaceExtension(QPainter* painter, const IntRect& exposedRect)
{
    NPImageExpose imageExpose;
    QPoint offset;
    QWebPageClient* client = m_parentFrame->view()->hostWindow()->platformPageClient();
    const bool surfaceHasUntransformedContents = client && qobject_cast<QWidget*>(client->pluginParent());

    QPaintDevice* surface =  QPainter::redirected(painter->device(), &offset);

    // If the surface is a QImage, we can render directly into it
    if (surfaceHasUntransformedContents && surface && surface->devType() == QInternal::Image) {
        QImage* image = static_cast<QImage*>(surface);
        offset = -offset; // negating the offset gives us the offset of the view within the surface
        imageExpose.data = reinterpret_cast<char*>(image->bits());
        imageExpose.dataSize.width = image->width();
        imageExpose.dataSize.height = image->height();
        imageExpose.stride = image->bytesPerLine();
        imageExpose.depth = image->depth(); // this is guaranteed to be 16 on Maemo5
        imageExpose.translateX = offset.x() + m_windowRect.x();
        imageExpose.translateY = offset.y() + m_windowRect.y();
        imageExpose.scaleX = 1;
        imageExpose.scaleY = 1;
    } else {
        if (m_isTransparent) {
            // On Maemo5, Flash expects the buffer to contain the contents that are below it.
            // We don't support transparency for non-raster graphicssystem, so clean the image 
            // before giving to Flash.
            QPainter imagePainter(&m_image);
            imagePainter.fillRect(exposedRect, Qt::white);
        }

        imageExpose.data = reinterpret_cast<char*>(m_image.bits());
        imageExpose.dataSize.width = m_image.width();
        imageExpose.dataSize.height = m_image.height();
        imageExpose.stride = m_image.bytesPerLine();
        imageExpose.depth = m_image.depth();
        imageExpose.translateX = 0;
        imageExpose.translateY = 0;
        imageExpose.scaleX = 1;
        imageExpose.scaleY = 1;
    }
    imageExpose.x = exposedRect.x();
    imageExpose.y = exposedRect.y();
    imageExpose.width = exposedRect.width();
    imageExpose.height = exposedRect.height();

    XEvent xevent;
    memset(&xevent, 0, sizeof(XEvent));
    XGraphicsExposeEvent& exposeEvent = xevent.xgraphicsexpose;
    exposeEvent.type = GraphicsExpose;
    exposeEvent.display = 0;
    exposeEvent.drawable = reinterpret_cast<XID>(&imageExpose);
    exposeEvent.x = exposedRect.x();
    exposeEvent.y = exposedRect.y();
    exposeEvent.width = exposedRect.width();
    exposeEvent.height = exposedRect.height();

    dispatchNPEvent(xevent);

    if (!surfaceHasUntransformedContents || !surface || surface->devType() != QInternal::Image)
        painter->drawImage(QPoint(frameRect().x() + exposedRect.x(), frameRect().y() + exposedRect.y()), m_image, exposedRect);
}
#endif

void PluginView::paintUsingXPixmap(QPainter* painter, const QRect &exposedRect)
{
    QPixmap qtDrawable = QPixmap::fromX11Pixmap(m_drawable, QPixmap::ExplicitlyShared);
    const int drawableDepth = ((NPSetWindowCallbackStruct*)m_npWindow.ws_info)->depth;
    ASSERT(drawableDepth == qtDrawable.depth());
    const bool syncX = m_pluginDisplay && m_pluginDisplay != QX11Info::display();

    // When printing, Qt uses a QPicture to capture the output in preview mode. The
    // QPicture holds a reference to the X Pixmap. As a result, the print preview would
    // update itself when the X Pixmap changes. To prevent this, we create a copy.
    if (m_element->document()->printing())
        qtDrawable = qtDrawable.copy();

    if (m_isTransparent && drawableDepth != 32) {
        // Attempt content propagation for drawable with no alpha by copying over from the backing store
        QPoint offset;
        QPaintDevice* backingStoreDevice =  QPainter::redirected(painter->device(), &offset);
        offset = -offset; // negating the offset gives us the offset of the view within the backing store pixmap

        const bool hasValidBackingStore = backingStoreDevice && backingStoreDevice->devType() == QInternal::Pixmap;
        QPixmap* backingStorePixmap = static_cast<QPixmap*>(backingStoreDevice);

        // We cannot grab contents from the backing store when painting on QGraphicsView items
        // (because backing store contents are already transformed). What we really mean to do 
        // here is to check if we are painting on QWebView, but let's be a little permissive :)
        QWebPageClient* client = m_parentFrame->view()->hostWindow()->platformPageClient();
        const bool backingStoreHasUntransformedContents = client && qobject_cast<QWidget*>(client->pluginParent());

        if (hasValidBackingStore && backingStorePixmap->depth() == drawableDepth 
            && backingStoreHasUntransformedContents) {
            GC gc = XDefaultGC(QX11Info::display(), QX11Info::appScreen());
            XCopyArea(QX11Info::display(), backingStorePixmap->handle(), m_drawable, gc,
                offset.x() + m_windowRect.x() + exposedRect.x(), offset.y() + m_windowRect.y() + exposedRect.y(),
                exposedRect.width(), exposedRect.height(), exposedRect.x(), exposedRect.y());
        } else { // no backing store, clean the pixmap because the plugin thinks its transparent
            QPainter painter(&qtDrawable);
            painter.fillRect(exposedRect, Qt::white);
        }

        if (syncX)
            QApplication::syncX();
    }

    XEvent xevent;
    memset(&xevent, 0, sizeof(XEvent));
    XGraphicsExposeEvent& exposeEvent = xevent.xgraphicsexpose;
    exposeEvent.type = GraphicsExpose;
    exposeEvent.display = QX11Info::display();
    exposeEvent.drawable = qtDrawable.handle();
    exposeEvent.x = exposedRect.x();
    exposeEvent.y = exposedRect.y();
    exposeEvent.width = exposedRect.x() + exposedRect.width(); // flash bug? it thinks width is the right in transparent mode
    exposeEvent.height = exposedRect.y() + exposedRect.height(); // flash bug? it thinks height is the bottom in transparent mode

    dispatchNPEvent(xevent);

    if (syncX)
        XSync(m_pluginDisplay, false); // sync changes by plugin

    painter->drawPixmap(QPoint(exposedRect.x(), exposedRect.y()), qtDrawable, exposedRect);
}

void PluginView::paint(GraphicsContext* context, const IntRect& rect)
{
    if (!m_isStarted) {
        paintMissingPluginIcon(context, rect);
        return;
    }

    if (context->paintingDisabled())
        return;

    setNPWindowIfNeeded();

    if (m_isWindowed)
        return;

#if USE(ACCELERATED_COMPOSITING)
    if (m_platformLayer)
        return;
#endif

    if (!m_drawable
#if defined(MOZ_PLATFORM_MAEMO) && (MOZ_PLATFORM_MAEMO >= 5)
        && m_image.isNull()
#endif
       )
        return;

    QPainter* painter = context->platformContext();
    IntRect exposedRect(rect);
    exposedRect.intersect(frameRect());
    exposedRect.move(-frameRect().x(), -frameRect().y());

#if defined(MOZ_PLATFORM_MAEMO) && (MOZ_PLATFORM_MAEMO >= 5)
    if (!m_image.isNull()) {
        paintUsingImageSurfaceExtension(painter, exposedRect);
        return;
    }
#endif

    painter->translate(frameRect().x(), frameRect().y());
    paintUsingXPixmap(painter, exposedRect);
    painter->translate(-frameRect().x(), -frameRect().y());
}

// TODO: Unify across ports.
bool PluginView::dispatchNPEvent(NPEvent& event)
{
    if (!m_plugin->pluginFuncs()->event)
        return false;

    PluginView::setCurrentPluginView(this);
#if USE(JSC)
    JSC::JSLock::DropAllLocks dropAllLocks(JSC::SilenceAssertionsOnly);
#endif
    setCallingPlugin(true);
    bool accepted = m_plugin->pluginFuncs()->event(m_instance, &event);
    setCallingPlugin(false);
    PluginView::setCurrentPluginView(0);

    return accepted;
}

void setSharedXEventFields(XEvent* xEvent, QWidget* ownerWidget)
{
    xEvent->xany.serial = 0; // we are unaware of the last request processed by X Server
    xEvent->xany.send_event = false;
    xEvent->xany.display = QX11Info::display();
    // NOTE: event->xany.window doesn't always respond to the .window property of other XEvent's
    // but does in the case of KeyPress, KeyRelease, ButtonPress, ButtonRelease, and MotionNotify
    // events; thus, this is right:
    xEvent->xany.window = ownerWidget ? ownerWidget->window()->handle() : 0;
}

void PluginView::initXEvent(XEvent* xEvent)
{
    memset(xEvent, 0, sizeof(XEvent));

    QWebPageClient* client = m_parentFrame->view()->hostWindow()->platformPageClient();
    QWidget* ownerWidget = client ? client->ownerWidget() : 0;
    setSharedXEventFields(xEvent, ownerWidget);
}

void setXKeyEventSpecificFields(XEvent* xEvent, KeyboardEvent* event)
{
    const PlatformKeyboardEvent* keyEvent = event->keyEvent();

    xEvent->type = (event->type() == eventNames().keydownEvent) ? 2 : 3; // ints as Qt unsets KeyPress and KeyRelease
    xEvent->xkey.root = QX11Info::appRootWindow();
    xEvent->xkey.subwindow = 0; // we have no child window
    xEvent->xkey.time = event->timeStamp();
    xEvent->xkey.state = keyEvent->nativeModifiers();
    xEvent->xkey.keycode = keyEvent->nativeScanCode();

    // We may not have a nativeScanCode() if the key event is from DRT's eventsender. In that
    // case fetch the XEvent's keycode from the event's text. The only
    // place this keycode will be used is in webkit_test_plugin_handle_event().
    // FIXME: Create Qt API so that we can set the appropriate keycode in DRT EventSender instead.
    if (QWebPagePrivate::drtRun && !xEvent->xkey.keycode) {
        QKeyEvent* qKeyEvent = keyEvent->qtEvent();
        ASSERT(qKeyEvent);
        QString keyText = qKeyEvent->text().left(1);
        xEvent->xkey.keycode = XKeysymToKeycode(QX11Info::display(), XStringToKeysym(keyText.toUtf8().constData()));
    }

    xEvent->xkey.same_screen = true;

    // NOTE: As the XEvents sent to the plug-in are synthesized and there is not a native window
    // corresponding to the plug-in rectangle, some of the members of the XEvent structures are not
    // set to their normal Xserver values. e.g. Key events don't have a position.
    // source: https://developer.mozilla.org/en/NPEvent
    xEvent->xkey.x = 0;
    xEvent->xkey.y = 0;
    xEvent->xkey.x_root = 0;
    xEvent->xkey.y_root = 0;
}

void PluginView::handleKeyboardEvent(KeyboardEvent* event)
{
    if (m_isWindowed)
        return;

    if (event->type() != eventNames().keydownEvent && event->type() != eventNames().keyupEvent)
        return;

    XEvent npEvent;
    initXEvent(&npEvent);
    setXKeyEventSpecificFields(&npEvent, event);

    if (!dispatchNPEvent(npEvent))
        event->setDefaultHandled();
}

static unsigned int inputEventState(MouseEvent* event)
{
    unsigned int state = 0;
    if (event->ctrlKey())
        state |= ControlMask;
    if (event->shiftKey())
        state |= ShiftMask;
    if (event->altKey())
        state |= Mod1Mask;
    if (event->metaKey())
        state |= Mod4Mask;
    return state;
}

static void setXButtonEventSpecificFields(XEvent* xEvent, MouseEvent* event, const IntPoint& postZoomPos)
{
    XButtonEvent& xbutton = xEvent->xbutton;
    xbutton.type = event->type() == eventNames().mousedownEvent ? ButtonPress : ButtonRelease;
    xbutton.root = QX11Info::appRootWindow();
    xbutton.subwindow = 0;
    xbutton.time = event->timeStamp();
    xbutton.x = postZoomPos.x();
    xbutton.y = postZoomPos.y();
    xbutton.x_root = event->screenX();
    xbutton.y_root = event->screenY();
    xbutton.state = inputEventState(event);
    switch (event->button()) {
    case MiddleButton:
        xbutton.button = Button2;
        break;
    case RightButton:
        xbutton.button = Button3;
        break;
    case LeftButton:
    default:
        xbutton.button = Button1;
        break;
    }
    xbutton.same_screen = true;
}

static void setXMotionEventSpecificFields(XEvent* xEvent, MouseEvent* event, const IntPoint& postZoomPos)
{
    XMotionEvent& xmotion = xEvent->xmotion;
    xmotion.type = MotionNotify;
    xmotion.root = QX11Info::appRootWindow();
    xmotion.subwindow = 0;
    xmotion.time = event->timeStamp();
    xmotion.x = postZoomPos.x();
    xmotion.y = postZoomPos.y();
    xmotion.x_root = event->screenX();
    xmotion.y_root = event->screenY();
    xmotion.state = inputEventState(event);
    xmotion.is_hint = NotifyNormal;
    xmotion.same_screen = true;
}

static void setXCrossingEventSpecificFields(XEvent* xEvent, MouseEvent* event, const IntPoint& postZoomPos)
{
    XCrossingEvent& xcrossing = xEvent->xcrossing;
    xcrossing.type = event->type() == eventNames().mouseoverEvent ? EnterNotify : LeaveNotify;
    xcrossing.root = QX11Info::appRootWindow();
    xcrossing.subwindow = 0;
    xcrossing.time = event->timeStamp();
    xcrossing.x = postZoomPos.y();
    xcrossing.y = postZoomPos.x();
    xcrossing.x_root = event->screenX();
    xcrossing.y_root = event->screenY();
    xcrossing.state = inputEventState(event);
    xcrossing.mode = NotifyNormal;
    xcrossing.detail = NotifyDetailNone;
    xcrossing.same_screen = true;
    xcrossing.focus = false;
}

void PluginView::handleMouseEvent(MouseEvent* event)
{
    if (m_isWindowed)
        return;

    if (event->button() == RightButton && m_plugin->quirks().contains(PluginQuirkIgnoreRightClickInWindowlessMode))
        return;

    if (event->type() == eventNames().mousedownEvent) {
        // Give focus to the plugin on click
        if (Page* page = m_parentFrame->page())
            page->focusController()->setActive(true);

        focusPluginElement();
    }

    XEvent npEvent;
    initXEvent(&npEvent);

    IntPoint postZoomPos = roundedIntPoint(m_element->renderer()->absoluteToLocal(event->absoluteLocation()));

    if (event->type() == eventNames().mousedownEvent || event->type() == eventNames().mouseupEvent)
        setXButtonEventSpecificFields(&npEvent, event, postZoomPos);
    else if (event->type() == eventNames().mousemoveEvent)
        setXMotionEventSpecificFields(&npEvent, event, postZoomPos);
    else if (event->type() == eventNames().mouseoutEvent || event->type() == eventNames().mouseoverEvent)
        setXCrossingEventSpecificFields(&npEvent, event, postZoomPos);
    else
        return;

    if (!dispatchNPEvent(npEvent))
        event->setDefaultHandled();
}

void PluginView::handleFocusInEvent()
{
    XEvent npEvent;
    initXEvent(&npEvent);

    XFocusChangeEvent& event = npEvent.xfocus;
    event.type = 9; /* int as Qt unsets FocusIn */
    event.mode = NotifyNormal;
    event.detail = NotifyDetailNone;

    dispatchNPEvent(npEvent);
}

void PluginView::handleFocusOutEvent()
{
    XEvent npEvent;
    initXEvent(&npEvent);

    XFocusChangeEvent& event = npEvent.xfocus;
    event.type = 10; /* int as Qt unsets FocusOut */
    event.mode = NotifyNormal;
    event.detail = NotifyDetailNone;

    dispatchNPEvent(npEvent);
}

void PluginView::setParent(ScrollView* parent)
{
    Widget::setParent(parent);

    if (parent)
        init();
}

void PluginView::setNPWindowRect(const IntRect&)
{
    if (!m_isWindowed)
        setNPWindowIfNeeded();
}

void PluginView::setNPWindowIfNeeded()
{
    if (!m_isStarted || !parent() || !m_plugin->pluginFuncs()->setwindow)
        return;

    // If the plugin didn't load sucessfully, no point in calling setwindow
    if (m_status != PluginStatusLoadedSuccessfully)
        return;

    // On Unix, only call plugin if it's full-page or windowed
    if (m_mode != NP_FULL && m_mode != NP_EMBED)
        return;

    // Check if the platformPluginWidget still exists
    if (m_isWindowed && !platformPluginWidget())
        return;

    if (!m_hasPendingGeometryChange)
        return;
    m_hasPendingGeometryChange = false;

    if (m_isWindowed) {
        platformPluginWidget()->setGeometry(m_windowRect);

        // Cut out areas of the plugin occluded by iframe shims
        Vector<IntRect> cutOutRects;
        QRegion clipRegion = QRegion(m_clipRect);
        getPluginOcclusions(m_element, this->parent(), frameRect(), cutOutRects);
        for (size_t i = 0; i < cutOutRects.size(); i++) {
            cutOutRects[i].move(-frameRect().x(), -frameRect().y());
            clipRegion = clipRegion.subtracted(QRegion(cutOutRects[i]));
        }
        // if setMask is set with an empty QRegion, no clipping will
        // be performed, so in that case we hide the plugin view
        platformPluginWidget()->setVisible(!clipRegion.isEmpty());
        platformPluginWidget()->setMask(clipRegion);

        m_npWindow.x = m_windowRect.x();
        m_npWindow.y = m_windowRect.y();
    } else {
        m_npWindow.x = 0;
        m_npWindow.y = 0;
    }

    // If the width or height are null, set the clipRect to null, indicating that
    // the plugin is not visible/scrolled out.
    if (!m_clipRect.width() || !m_clipRect.height()) {
        m_npWindow.clipRect.left = 0;
        m_npWindow.clipRect.right = 0;
        m_npWindow.clipRect.top = 0;
        m_npWindow.clipRect.bottom = 0;
    } else {
        // Clipping rectangle of the plug-in; the origin is the top left corner of the drawable or window. 
        m_npWindow.clipRect.left = m_npWindow.x + m_clipRect.x();
        m_npWindow.clipRect.top = m_npWindow.y + m_clipRect.y();
        m_npWindow.clipRect.right = m_npWindow.x + m_clipRect.x() + m_clipRect.width();
        m_npWindow.clipRect.bottom = m_npWindow.y + m_clipRect.y() + m_clipRect.height();
    }

    if (m_plugin->quirks().contains(PluginQuirkDontCallSetWindowMoreThanOnce)) {
        // FLASH WORKAROUND: Only set initially. Multiple calls to
        // setNPWindow() cause the plugin to crash in windowed mode.
        if (!m_isWindowed || m_npWindow.width == -1 || m_npWindow.height == -1) {
            m_npWindow.width = m_windowRect.width();
            m_npWindow.height = m_windowRect.height();
        }
    } else {
        m_npWindow.width = m_windowRect.width();
        m_npWindow.height = m_windowRect.height();
    }

    PluginView::setCurrentPluginView(this);
#if USE(JSC)
    JSC::JSLock::DropAllLocks dropAllLocks(JSC::SilenceAssertionsOnly);
#endif
    setCallingPlugin(true);
    m_plugin->pluginFuncs()->setwindow(m_instance, &m_npWindow);
    setCallingPlugin(false);
    PluginView::setCurrentPluginView(0);
}

void PluginView::setParentVisible(bool visible)
{
    if (isParentVisible() == visible)
        return;

    Widget::setParentVisible(visible);

    if (isSelfVisible() && platformPluginWidget())
        platformPluginWidget()->setVisible(visible);
}

NPError PluginView::handlePostReadFile(Vector<char>& buffer, uint32_t len, const char* buf)
{
    String filename(buf, len);

    if (filename.startsWith("file:///"))
        filename = filename.substring(8);

    long long size;
    if (!getFileSize(filename, size))
        return NPERR_FILE_NOT_FOUND;

    FILE* fileHandle = fopen((filename.utf8()).data(), "r");
    if (!fileHandle)
        return NPERR_FILE_NOT_FOUND;

    buffer.resize(size);
    int bytesRead = fread(buffer.data(), 1, size, fileHandle);

    fclose(fileHandle);

    if (bytesRead <= 0)
        return NPERR_FILE_NOT_FOUND;

    return NPERR_NO_ERROR;
}

bool PluginView::platformGetValueStatic(NPNVariable variable, void* value, NPError* result)
{
    switch (variable) {
    case NPNVToolkit:
        *static_cast<uint32_t*>(value) = 0;
        *result = NPERR_NO_ERROR;
        return true;

    case NPNVSupportsXEmbedBool:
        *static_cast<NPBool*>(value) = true;
        *result = NPERR_NO_ERROR;
        return true;

    case NPNVjavascriptEnabledBool:
        *static_cast<NPBool*>(value) = true;
        *result = NPERR_NO_ERROR;
        return true;

    case NPNVSupportsWindowless:
        *static_cast<NPBool*>(value) = true;
        *result = NPERR_NO_ERROR;
        return true;

#if defined(MOZ_PLATFORM_MAEMO) && (MOZ_PLATFORM_MAEMO >= 5)
    case NPNVSupportsWindowlessLocal:
        *static_cast<NPBool*>(value) = true;
        *result = NPERR_NO_ERROR;
        return true;
#endif

    default:
        return false;
    }
}

bool PluginView::platformGetValue(NPNVariable variable, void* value, NPError* result)
{
    switch (variable) {
    case NPNVxDisplay:
        *(void **)value = QX11Info::display();
        *result = NPERR_NO_ERROR;
        return true;

    case NPNVxtAppContext:
        *result = NPERR_GENERIC_ERROR;
        return true;

    case NPNVnetscapeWindow: {
        void* w = reinterpret_cast<void*>(value);
        QWebPageClient* client = m_parentFrame->view()->hostWindow()->platformPageClient();
        *((XID *)w) = client ? client->ownerWidget()->window()->winId() : 0;
        *result = NPERR_NO_ERROR;
        return true;
    }

    case NPNVToolkit:
        if (m_plugin->quirks().contains(PluginQuirkRequiresGtkToolKit)) {
            *((uint32_t *)value) = 2;
            *result = NPERR_NO_ERROR;
            return true;
        }
        return false;

    default:
        return false;
    }
}

void PluginView::invalidateRect(const IntRect& rect)
{
#if USE(ACCELERATED_COMPOSITING) && !USE(TEXTURE_MAPPER)
    if (m_platformLayer) {
        m_platformLayer->update(QRectF(rect));
        return;
    }
#endif

    if (m_isWindowed) {
        if (platformWidget()) {
            // update() will schedule a repaint of the widget so ensure
            // its knowledge of its position on the page is up to date.
            platformWidget()->setGeometry(m_windowRect);
            platformWidget()->update(rect);
        }
        return;
    }

    invalidateWindowlessPluginRect(rect);
}

void PluginView::invalidateRect(NPRect* rect)
{
    if (!rect) {
        invalidate();
        return;
    }
    IntRect r(rect->left, rect->top, rect->right - rect->left, rect->bottom - rect->top);
    invalidateRect(r);
}

void PluginView::invalidateRegion(NPRegion region)
{
    Q_UNUSED(region);
    invalidate();
}

void PluginView::forceRedraw()
{
    invalidate();
}

static Display *getPluginDisplay()
{
    // The plugin toolkit might run using a different X connection. At the moment, we only
    // support gdk based plugins (like flash) that use a different X connection.
    // The code below has the same effect as this one:
    // Display *gdkDisplay = gdk_x11_display_get_xdisplay(gdk_display_get_default());
    QLibrary library(QLatin1String("libgdk-x11-2.0"), 0);
    if (!library.load())
        return 0;

    typedef void *(*gdk_display_get_default_ptr)();
    gdk_display_get_default_ptr gdk_display_get_default = (gdk_display_get_default_ptr)library.resolve("gdk_display_get_default");
    if (!gdk_display_get_default)
        return 0;

    typedef void *(*gdk_x11_display_get_xdisplay_ptr)(void *);
    gdk_x11_display_get_xdisplay_ptr gdk_x11_display_get_xdisplay = (gdk_x11_display_get_xdisplay_ptr)library.resolve("gdk_x11_display_get_xdisplay");
    if (!gdk_x11_display_get_xdisplay)
        return 0;

    return (Display*)gdk_x11_display_get_xdisplay(gdk_display_get_default());
}

static void getVisualAndColormap(int depth, Visual **visual, Colormap *colormap)
{
    *visual = 0;
    *colormap = 0;

#ifndef QT_NO_XRENDER
    static const bool useXRender = qgetenv("QT_X11_NO_XRENDER").isNull(); // Should also check for XRender >= 0.5
#else
    static const bool useXRender = false;
#endif

    if (!useXRender && depth == 32)
        return;

    int nvi;
    XVisualInfo templ;
    templ.screen  = QX11Info::appScreen();
    templ.depth   = depth;
    templ.c_class = TrueColor;
    XVisualInfo* xvi = XGetVisualInfo(QX11Info::display(), VisualScreenMask | VisualDepthMask | VisualClassMask, &templ, &nvi);

    if (!xvi)
        return;

#ifndef QT_NO_XRENDER
    if (depth == 32) {
        for (int idx = 0; idx < nvi; ++idx) {
            XRenderPictFormat* format = XRenderFindVisualFormat(QX11Info::display(), xvi[idx].visual);
            if (format->type == PictTypeDirect && format->direct.alphaMask) {
                 *visual = xvi[idx].visual;
                 break;
            }
         }
    } else
#endif // QT_NO_XRENDER
        *visual = xvi[0].visual;

    XFree(xvi);

    if (*visual)
        *colormap = XCreateColormap(QX11Info::display(), QX11Info::appRootWindow(), *visual, AllocNone);
}

bool PluginView::platformStart()
{
    ASSERT(m_isStarted);
    ASSERT(m_status == PluginStatusLoadedSuccessfully);

    if (m_plugin->pluginFuncs()->getvalue) {
        PluginView::setCurrentPluginView(this);
#if USE(JSC)
        JSC::JSLock::DropAllLocks dropAllLocks(JSC::SilenceAssertionsOnly);
#endif
        setCallingPlugin(true);
        m_plugin->pluginFuncs()->getvalue(m_instance, NPPVpluginNeedsXEmbed, &m_needsXEmbed);
        setCallingPlugin(false);
        PluginView::setCurrentPluginView(0);
    }

    if (m_isWindowed) {
        QWebPageClient* client = m_parentFrame->view()->hostWindow()->platformPageClient();
        if (m_needsXEmbed && client) {
            setPlatformWidget(new PluginContainerQt(this, client->ownerWidget()));
            // sync our XEmbed container window creation before sending the xid to plugins.
            QApplication::syncX();
        } else {
            notImplemented();
            m_status = PluginStatusCanNotLoadPlugin;
            return false;
        }
    } else {
        setPlatformWidget(0);
        m_pluginDisplay = getPluginDisplay();

#if USE(ACCELERATED_COMPOSITING) && !USE(TEXTURE_MAPPER)
        if (m_parentFrame->page()->chrome()->client()->allowsAcceleratedCompositing()
            && m_parentFrame->page()->settings() 
            && m_parentFrame->page()->settings()->acceleratedCompositingEnabled()) {
            m_platformLayer = new PluginGraphicsLayerQt(this);
            // Trigger layer computation in RenderLayerCompositor
            m_element->setNeedsStyleRecalc(SyntheticStyleChange);
        }
#endif
    }

    // If the width and the height are not zero we show the PluginView.
    if (!frameRect().isEmpty())
        show();

    NPSetWindowCallbackStruct* wsi = new NPSetWindowCallbackStruct();
    wsi->type = 0;

    if (m_isWindowed) {
        const QX11Info* x11Info = &platformPluginWidget()->x11Info();

        wsi->display = x11Info->display();
        wsi->visual = (Visual*)x11Info->visual();
        wsi->depth = x11Info->depth();
        wsi->colormap = x11Info->colormap();

        m_npWindow.type = NPWindowTypeWindow;
        m_npWindow.window = (void*)platformPluginWidget()->winId();
        m_npWindow.width = -1;
        m_npWindow.height = -1;
    } else {
        const QX11Info* x11Info = &QApplication::desktop()->x11Info();

        if (x11Info->depth() == 32 || !m_plugin->quirks().contains(PluginQuirkRequiresDefaultScreenDepth)) {
            getVisualAndColormap(32, &m_visual, &m_colormap);
            wsi->depth = 32;
        }

        if (!m_visual) {
            getVisualAndColormap(x11Info->depth(), &m_visual, &m_colormap);
            wsi->depth = x11Info->depth();
        }

        wsi->display = x11Info->display();
        wsi->visual = m_visual;
        wsi->colormap = m_colormap;

        m_npWindow.type = NPWindowTypeDrawable;
        m_npWindow.window = 0; // Not used?
        m_npWindow.x = 0;
        m_npWindow.y = 0;
        m_npWindow.width = -1;
        m_npWindow.height = -1;
    }

    m_npWindow.ws_info = wsi;

    if (!(m_plugin->quirks().contains(PluginQuirkDeferFirstSetWindowCall))) {
        updatePluginWidget();
        setNPWindowIfNeeded();
    }

    return true;
}

void PluginView::platformDestroy()
{
    if (platformPluginWidget())
        delete platformPluginWidget();

    if (m_drawable)
        XFreePixmap(QX11Info::display(), m_drawable);

    if (m_colormap)
        XFreeColormap(QX11Info::display(), m_colormap);
}

void PluginView::halt()
{
}

void PluginView::restart()
{
}
 
#if USE(ACCELERATED_COMPOSITING)
PlatformLayer* PluginView::platformLayer() const
{
    return m_platformLayer.get();
}
#endif

} // namespace WebCore