root/content/child/npapi/webplugin_delegate_impl_gtk.cc

DEFINITIONS

1. creation_succeeded_
2. PlatformInitialize
3. PlatformDestroyInstance
4. Paint
5. WindowedCreatePlugin
6. WindowedDestroyWindow
7. WindowedReposition
8. WindowedSetWindow
9. WindowlessUpdateGeometry
10. EnsurePixmapAtLeastSize
11. DrawDebugRectangle
12. WindowlessPaint
13. WindowlessSetWindow
14. PlatformSetPluginHasFocus
15. GetXModifierState
16. NPEventFromWebMouseEvent
17. NPEventFromWebKeyboardEvent
18. NPEventFromWebInputEvent
19. PlatformHandleInputEvent

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/child/npapi/webplugin_delegate_impl.h"

#include <gdk/gdkx.h>
#include <gtk/gtk.h>

#include <string>
#include <vector>

#include "base/metrics/stats_counters.h"
#include "content/child/npapi/plugin_instance.h"
#include "content/child/npapi/webplugin.h"
#include "content/common/cursors/webcursor.h"
#include "content/public/common/content_constants.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
#include "ui/gfx/blit.h"
#include "ui/gfx/gtk_compat.h"

#include "third_party/npapi/bindings/npapi_x11.h"

using blink::WebKeyboardEvent;
using blink::WebInputEvent;
using blink::WebMouseEvent;

namespace content {

WebPluginDelegateImpl::WebPluginDelegateImpl(
    WebPlugin* plugin,
    PluginInstance* instance)
    : windowed_handle_(0),
      windowed_did_set_window_(false),
      windowless_(false),
      plugin_(plugin),
      instance_(instance),
      windowless_shm_pixmap_(None),
      pixmap_(NULL),
      first_event_time_(-1.0),
      plug_(NULL),
      socket_(NULL),
      quirks_(0),
      handle_event_depth_(0),
      first_set_window_call_(true),
      plugin_has_focus_(false),
      has_webkit_focus_(false),
      containing_view_has_focus_(true),
      creation_succeeded_(false) {
  memset(&window_, 0, sizeof(window_));
  if (instance_->mime_type() == kFlashPluginSwfMimeType) {
    // Flash is tied to Firefox's whacky behavior with windowless plugins. See
    // comments in WindowlessPaint.
    // TODO(viettrungluu): PLUGIN_QUIRK_WINDOWLESS_NO_RIGHT_CLICK: Don't allow
    // right-clicks in windowless content since Flash 10.1 (initial release, at
    // least) hangs in that case. Remove this once Flash is fixed.
    quirks_ |= PLUGIN_QUIRK_WINDOWLESS_OFFSET_WINDOW_TO_DRAW
        | PLUGIN_QUIRK_WINDOWLESS_INVALIDATE_AFTER_SET_WINDOW
        | PLUGIN_QUIRK_WINDOWLESS_NO_RIGHT_CLICK;
  }

  // TODO(evanm): I played with this for quite a while but couldn't
  // figure out a way to make Flash not crash unless I didn't call
  // NPP_SetWindow.
  // However, after piman's grand refactor of windowed plugins, maybe
  // this is no longer necessary.
  quirks_ |= PLUGIN_QUIRK_DONT_SET_NULL_WINDOW_HANDLE_ON_DESTROY;
}

WebPluginDelegateImpl::~WebPluginDelegateImpl() {
  DestroyInstance();

  if (!windowless_)
    WindowedDestroyWindow();

  if (window_.ws_info) {
    // We only ever use ws_info as an NPSetWindowCallbackStruct.
    delete static_cast<NPSetWindowCallbackStruct*>(window_.ws_info);
  }

  if (pixmap_) {
    g_object_unref(pixmap_);
    pixmap_ = NULL;
  }
}

bool WebPluginDelegateImpl::PlatformInitialize() {
  gfx::PluginWindowHandle handle =
      windowless_ ? 0 : gtk_plug_get_id(GTK_PLUG(plug_));
  plugin_->SetWindow(handle);
  return true;
}

void WebPluginDelegateImpl::PlatformDestroyInstance() {
  // Nothing to do here.
}

void WebPluginDelegateImpl::Paint(SkCanvas* canvas, const gfx::Rect& rect) {
  if (!windowless_ || !skia::SupportsPlatformPaint(canvas))
    return;
  skia::ScopedPlatformPaint scoped_platform_paint(canvas);
  cairo_t* context = scoped_platform_paint.GetPlatformSurface();
  WindowlessPaint(context, rect);
}

bool WebPluginDelegateImpl::WindowedCreatePlugin() {
  DCHECK(!windowed_handle_);
  DCHECK(!plug_);

  // NPP_GetValue() might write 4 bytes of data to this variable.  Don't use a
  // single byte bool, use an int instead and make sure it is initialized.
  int xembed = 0;
  NPError err = instance_->NPP_GetValue(NPPVpluginNeedsXEmbed, &xembed);
  if (err != NPERR_NO_ERROR || !xembed) {
    NOTIMPLEMENTED() << " windowed plugin but without xembed. "
      "See http://code.google.com/p/chromium/issues/detail?id=38229";
    return false;
  }

  // Passing 0 as the socket XID creates a plug without plugging it in a socket
  // yet, so that it can be latter added with gtk_socket_add_id().
  plug_ = gtk_plug_new(0);
  gtk_widget_show(plug_);
  socket_ = gtk_socket_new();
  gtk_widget_show(socket_);
  gtk_container_add(GTK_CONTAINER(plug_), socket_);
  gtk_widget_show_all(plug_);

  // Prevent the plug from being destroyed if the browser kills the container
  // window.
  g_signal_connect(plug_, "delete-event", G_CALLBACK(gtk_true), NULL);
  // Prevent the socket from being destroyed when the plugin removes itself.
  g_signal_connect(socket_, "plug_removed", G_CALLBACK(gtk_true), NULL);

  windowed_handle_ = gtk_socket_get_id(GTK_SOCKET(socket_));

  window_.window = reinterpret_cast<void*>(windowed_handle_);

  if (!window_.ws_info)
    window_.ws_info = new NPSetWindowCallbackStruct;
  NPSetWindowCallbackStruct* extra =
      static_cast<NPSetWindowCallbackStruct*>(window_.ws_info);
  extra->type = NP_SETWINDOW;
  extra->display = GDK_DISPLAY();
  int screen = DefaultScreen(GDK_DISPLAY());
  extra->visual = DefaultVisual(GDK_DISPLAY(), screen);
  extra->depth = DefaultDepth(GDK_DISPLAY(), screen);
  extra->colormap = DefaultColormap(GDK_DISPLAY(), screen);

  return true;
}

void WebPluginDelegateImpl::WindowedDestroyWindow() {
  if (plug_) {
    plugin_->WillDestroyWindow(gtk_plug_get_id(GTK_PLUG(plug_)));

    gtk_widget_destroy(plug_);
    plug_ = NULL;
    socket_ = NULL;
    windowed_handle_ = 0;
  }
}

bool WebPluginDelegateImpl::WindowedReposition(
    const gfx::Rect& window_rect,
    const gfx::Rect& clip_rect) {
  if (window_rect == window_rect_ && clip_rect == clip_rect_)
    return false;

  window_rect_ = window_rect;
  clip_rect_ = clip_rect;

  return true;
}

void WebPluginDelegateImpl::WindowedSetWindow() {
  if (!instance_.get())
    return;

  if (!windowed_handle_) {
    NOTREACHED();
    return;
  }

  // See https://bugzilla.mozilla.org/show_bug.cgi?id=108347
  // If we call NPP_SetWindow with a <= 0 width or height, problems arise in
  // Flash (and possibly other plugins).
  // TODO(piman): the Mozilla code suggests that for the Java plugin, we should
  // still call NPP_SetWindow in that case. We need to verify that.
  if (window_rect_.width() <= 0 || window_rect_.height() <= 0) {
    return;
  }

  instance()->set_window_handle(windowed_handle_);

  DCHECK(!instance()->windowless());

  window_.clipRect.top = clip_rect_.y();
  window_.clipRect.left = clip_rect_.x();
  window_.clipRect.bottom = clip_rect_.y() + clip_rect_.height();
  window_.clipRect.right = clip_rect_.x() + clip_rect_.width();
  window_.height = window_rect_.height();
  window_.width = window_rect_.width();
  window_.x = window_rect_.x();
  window_.y = window_rect_.y();
  window_.type = NPWindowTypeWindow;

  // Reset this flag before entering the instance in case of side-effects.
  windowed_did_set_window_ = true;

  NPError err = instance()->NPP_SetWindow(&window_);
  DCHECK(err == NPERR_NO_ERROR);
}

void WebPluginDelegateImpl::WindowlessUpdateGeometry(
    const gfx::Rect& window_rect,
    const gfx::Rect& clip_rect) {
  // Only resend to the instance if the geometry has changed.
  if (window_rect == window_rect_ && clip_rect == clip_rect_)
    return;

  clip_rect_ = clip_rect;
  window_rect_ = window_rect;
  WindowlessSetWindow();
}

void WebPluginDelegateImpl::EnsurePixmapAtLeastSize(int width, int height) {
  if (pixmap_) {
    gint cur_width, cur_height;
    gdk_pixmap_get_size(pixmap_, &cur_width, &cur_height);
    if (cur_width >= width && cur_height >= height)
      return;  // We are already the appropriate size.

    // Otherwise, we need to recreate ourselves.
    g_object_unref(pixmap_);
    pixmap_ = NULL;
  }

  // |sys_visual| is owned by gdk; we shouldn't free it.
  GdkVisual* sys_visual = gdk_visual_get_system();
  pixmap_ = gdk_pixmap_new(NULL,  // use width/height/depth params
                           std::max(1, width), std::max(1, height),
                           sys_visual->depth);
  // TODO(erg): Replace this with GdkVisual when we move to GTK3.
  GdkColormap* colormap = gdk_colormap_new(gdk_visual_get_system(),
                                           FALSE);
  gdk_drawable_set_colormap(pixmap_, colormap);
  // The GdkDrawable now owns the GdkColormap.
  g_object_unref(colormap);
}

#ifdef DEBUG_RECTANGLES
namespace {

// Draw a rectangle on a Cairo context.
// Useful for debugging various rectangles involved in drawing plugins.
void DrawDebugRectangle(cairo_t* cairo,
                        const gfx::Rect& rect,
                        float r, float g, float b) {
  cairo_set_source_rgba(cairo, r, g, b, 0.5);
  cairo_rectangle(cairo, rect.x(), rect.y(),
                  rect.width(), rect.height());
  cairo_stroke(cairo);
}

}  // namespace
#endif

void WebPluginDelegateImpl::WindowlessPaint(cairo_t* context,
                                            const gfx::Rect& damage_rect) {
  // Compare to:
  // http://mxr.mozilla.org/firefox/source/layout/generic/nsObjectFrame.cpp:
  // nsPluginInstanceOwner::Renderer::NativeDraw().

  DCHECK(context);

  // TODO(darin): we should avoid calling NPP_SetWindow here since it may
  // cause page layout to be invalidated.

  // The actual dirty region is just the intersection of the plugin window and
  // the clip window with the damage region. However, the plugin wants to draw
  // relative to the containing window's origin, so our pixmap must be from the
  // window's origin down to the bottom-right edge of the dirty region.
  //
  // Typical case:
  // X-----------------------------------+-----------------------------+
  // |                                   |                             |
  // |    pixmap     +-------------------+                             |
  // |               |   damage          |                window       |
  // |               |                   |                             |
  // |           +---+-------------------+-------------+               |
  // |           |   |                   |   clip      |               |
  // |       +---+---+-------------------+----------+  |               |
  // |       |   |   |                   |          |  |               |
  // |       |   |   | draw              |          |  |               |
  // |       |   |   |                   |          |  |               |
  // +-------+---+---+-------------------+----------+--+               |
  // |       |       |                   |          |                  |
  // |       |       +-------------------+          |                  |
  // |       |                                      |                  |
  // |       |        plugin                        |                  |
  // |       +--------------------------------------+                  |
  // |                                                                 |
  // |                                                                 |
  // +-----------------------------------------------------------------+
  // X = origin
  //
  // NPAPI doesn't properly define which coordinates each of
  // - window.clipRect, window.x and window.y in the SetWindow call
  // - x and y in GraphicsExpose HandleEvent call
  // are relative to, nor does it define what the pixmap is relative to.
  //
  // Any sane values for them just don't work with the flash plugin. Firefox
  // has some interesting behavior. Experiments showed that:
  // - window.clipRect is always in the same space as window.x and window.y
  // - in the first SetWindow call, or when scrolling, window.x and window.y are
  // the coordinates of the plugin relative to the window.
  // - whenever only a part of the plugin is drawn, Firefox issues a SetWindow
  // call before each GraphicsExpose event, that sets the drawing origin to
  // (0, 0) as if the plugin was scrolled to be partially out of the view. The
  // GraphicsExpose event has coordinates relative to the "window" (assuming
  // that virtual scroll). The pixmap is also relative to the window. It always
  // sets the clip rect to the draw rect.
  //
  // Attempts to deviate from that makes Flash render at the wrong place in the
  // pixmap, or render the wrong pixels.
  //
  // Flash plugin:
  // X-----------------------------------------------------------------+
  // |                                                                 |
  // |               +-------------------+        "real" window        |
  // |               |   damage          |                             |
  // |               |                   |                             |
  // |           +---+-------------------+-------------+               |
  // |           |   |                   | "real" clip |               |
  // |       +---+---O===================#==========#==#===============#
  // |       |   |   H draw              |          |  |               H
  // |       |   |   H = pixmap          |          |  |               H
  // |       |   |   H = "apparent" clip |          |  |               H
  // |       +   +---#-------------------+----------+--+               H
  // |       |       H                   |          |                  H
  // |       |       H-------------------+          |                  H
  // |       |       H                              |                  H
  // |       |       H  plugin                      |                  H
  // |       +-------#------------------------------+                  H
  // |               H                                                 H
  // |               H                  "apparent" window              H
  // +---------------#=================================================#
  // X = "real" origin
  // O = "apparent" origin
  // "real" means as seen by Chrome
  // "apparent" means as seen by the plugin.

  gfx::Rect draw_rect = gfx::IntersectRects(window_rect_, damage_rect);

  // clip_rect_ is relative to the plugin
  gfx::Rect clip_rect_window = clip_rect_;
  clip_rect_window.Offset(window_rect_.x(), window_rect_.y());
  draw_rect.Intersect(clip_rect_window);

  // These offsets represent by how much the view is shifted to accomodate
  // Flash (the coordinates of X relative to O in the diagram above).
  int offset_x = 0;
  int offset_y = 0;
  if (quirks_ & PLUGIN_QUIRK_WINDOWLESS_OFFSET_WINDOW_TO_DRAW) {
    offset_x = -draw_rect.x();
    offset_y = -draw_rect.y();
    window_.clipRect.top = 0;
    window_.clipRect.left = 0;
    window_.clipRect.bottom = draw_rect.height();
    window_.clipRect.right = draw_rect.width();
    window_.height = window_rect_.height();
    window_.width = window_rect_.width();
    window_.x = window_rect_.x() - draw_rect.x();
    window_.y = window_rect_.y() - draw_rect.y();
    window_.type = NPWindowTypeDrawable;
    DCHECK(window_.ws_info);
    NPError err = instance()->NPP_SetWindow(&window_);
    DCHECK_EQ(err, NPERR_NO_ERROR);
  }

  gfx::Rect pixmap_draw_rect = draw_rect;
  pixmap_draw_rect.Offset(offset_x, offset_y);

  gfx::Rect pixmap_rect(0, 0,
                        pixmap_draw_rect.right(),
                        pixmap_draw_rect.bottom());

  // Construct the paint message, targeting the pixmap.
  NPEvent np_event = {0};
  XGraphicsExposeEvent& event = np_event.xgraphicsexpose;
  event.type = GraphicsExpose;
  event.x = pixmap_draw_rect.x();
  event.y = pixmap_draw_rect.y();
  event.width = pixmap_draw_rect.width();
  event.height = pixmap_draw_rect.height();
  event.display = GDK_DISPLAY();

  if (windowless_shm_pixmap_ != None) {
    Pixmap pixmap = None;
    GC xgc = NULL;
    Display* display = event.display;
    gfx::Rect plugin_draw_rect = draw_rect;

    // Make plugin_draw_rect relative to the plugin window.
    plugin_draw_rect.Offset(-window_rect_.x(), -window_rect_.y());

    // In case the drawing area does not start with the plugin window origin,
    // we can not let the plugin directly draw over the shared memory pixmap.
    if (plugin_draw_rect.x() != pixmap_draw_rect.x() ||
        plugin_draw_rect.y() != pixmap_draw_rect.y()) {
      pixmap = XCreatePixmap(display, windowless_shm_pixmap_,
                             std::max(1, pixmap_rect.width()),
                             std::max(1, pixmap_rect.height()),
                             DefaultDepth(display, DefaultScreen(display)));
      xgc = XCreateGC(display, windowless_shm_pixmap_, 0, NULL);
      // Copy the current image into the pixmap, so the plugin can draw over it.
      XCopyArea(display, windowless_shm_pixmap_, pixmap, xgc,
                plugin_draw_rect.x(), plugin_draw_rect.y(),
                pixmap_draw_rect.width(), pixmap_draw_rect.height(),
                pixmap_draw_rect.x(), pixmap_draw_rect.y());

      event.drawable = pixmap;
    } else {
      event.drawable = windowless_shm_pixmap_;
    }

    // Tell the plugin to paint into the pixmap.
    base::StatsRate plugin_paint("Plugin.Paint");
    base::StatsScope<base::StatsRate> scope(plugin_paint);
    instance()->NPP_HandleEvent(&np_event);

    if (pixmap != None) {
      // Copy the rendered image pixmap back into the shm pixmap
      // and thus the drawing buffer.
      XCopyArea(display, pixmap, windowless_shm_pixmap_, xgc,
                pixmap_draw_rect.x(), pixmap_draw_rect.y(),
                pixmap_draw_rect.width(), pixmap_draw_rect.height(),
                plugin_draw_rect.x(), plugin_draw_rect.y());
      XSync(display, FALSE);
      if (xgc)
        XFreeGC(display, xgc);
      XFreePixmap(display, pixmap);
    } else {
      XSync(display, FALSE);
    }
  } else {
    EnsurePixmapAtLeastSize(pixmap_rect.width(), pixmap_rect.height());

    // Copy the current image into the pixmap, so the plugin can draw over
    // this background.
    cairo_t* cairo = gdk_cairo_create(pixmap_);
    BlitContextToContext(cairo, pixmap_draw_rect, context, draw_rect.origin());
    cairo_destroy(cairo);

    event.drawable = GDK_PIXMAP_XID(pixmap_);

    // Tell the plugin to paint into the pixmap.
    base::StatsRate plugin_paint("Plugin.Paint");
    base::StatsScope<base::StatsRate> scope(plugin_paint);
    instance()->NPP_HandleEvent(&np_event);

    cairo_save(context);
    // Now copy the rendered image pixmap back into the drawing buffer.
    gdk_cairo_set_source_pixmap(context, pixmap_, -offset_x, -offset_y);
    cairo_rectangle(context, draw_rect.x(), draw_rect.y(),
                    draw_rect.width(), draw_rect.height());
    cairo_clip(context);
    cairo_paint(context);

#ifdef DEBUG_RECTANGLES
    // Draw some debugging rectangles.
    // Pixmap rect = blue.
    DrawDebugRectangle(context, pixmap_rect, 0, 0, 1);
    // Drawing rect = red.
    DrawDebugRectangle(context, draw_rect, 1, 0, 0);
#endif
    cairo_restore(context);
  }
}

void WebPluginDelegateImpl::WindowlessSetWindow() {
  if (!instance())
    return;

  if (window_rect_.IsEmpty())  // wait for geometry to be set.
    return;

  DCHECK(instance()->windowless());
  // Mozilla docs say that this window param is not used for windowless
  // plugins; rather, the window is passed during the GraphicsExpose event.
  DCHECK_EQ(window_.window, static_cast<void*>(NULL));

  window_.clipRect.top = clip_rect_.y() + window_rect_.y();
  window_.clipRect.left = clip_rect_.x() + window_rect_.x();
  window_.clipRect.bottom =
      clip_rect_.y() + clip_rect_.height() + window_rect_.y();
  window_.clipRect.right =
      clip_rect_.x() + clip_rect_.width() + window_rect_.x();
  window_.height = window_rect_.height();
  window_.width = window_rect_.width();
  window_.x = window_rect_.x();
  window_.y = window_rect_.y();
  window_.type = NPWindowTypeDrawable;

  if (!window_.ws_info)
    window_.ws_info = new NPSetWindowCallbackStruct;
  NPSetWindowCallbackStruct* extra =
      static_cast<NPSetWindowCallbackStruct*>(window_.ws_info);
  extra->display = GDK_DISPLAY();
  int screen = DefaultScreen(GDK_DISPLAY());
  extra->visual = DefaultVisual(GDK_DISPLAY(), screen);
  extra->depth = DefaultDepth(GDK_DISPLAY(), screen);
  extra->colormap = DefaultColormap(GDK_DISPLAY(), screen);

  NPError err = instance()->NPP_SetWindow(&window_);
  DCHECK(err == NPERR_NO_ERROR);
  if (quirks_ & PLUGIN_QUIRK_WINDOWLESS_INVALIDATE_AFTER_SET_WINDOW) {
    // After a NPP_SetWindow, Flash cancels its timer that generates the
    // invalidates until it gets a paint event, but doesn't explicitly call
    // NPP_InvalidateRect.
    plugin_->InvalidateRect(clip_rect_);
  }
}

bool WebPluginDelegateImpl::PlatformSetPluginHasFocus(bool focused) {
  DCHECK(instance()->windowless());

  NPEvent np_event = {0};
  XFocusChangeEvent& event = np_event.xfocus;
  event.type = focused ? FocusIn : FocusOut;
  event.display = GDK_DISPLAY();
  // Same values as Firefox. .serial and .window stay 0.
  event.mode = -1;
  event.detail = NotifyDetailNone;
  instance()->NPP_HandleEvent(&np_event);
  return true;
}

// Converts a WebInputEvent::Modifiers bitfield into a
// corresponding X modifier state.
static int GetXModifierState(int modifiers) {
  int x_state = 0;
  if (modifiers & WebInputEvent::ControlKey)
    x_state |= ControlMask;
  if (modifiers & WebInputEvent::ShiftKey)
    x_state |= ShiftMask;
  if (modifiers & WebInputEvent::AltKey)
    x_state |= Mod1Mask;
  if (modifiers & WebInputEvent::MetaKey)
    x_state |= Mod2Mask;
  if (modifiers & WebInputEvent::LeftButtonDown)
    x_state |= Button1Mask;
  if (modifiers & WebInputEvent::MiddleButtonDown)
    x_state |= Button2Mask;
  if (modifiers & WebInputEvent::RightButtonDown)
    x_state |= Button3Mask;
  // TODO(piman@google.com): There are other modifiers, e.g. Num Lock, that
  // should be set (and Firefox does), but we didn't keep the information in
  // the WebKit event.
  return x_state;
}

static bool NPEventFromWebMouseEvent(const WebMouseEvent& event,
                                     Time timestamp,
                                     NPEvent* np_event) {
  np_event->xany.display = GDK_DISPLAY();
  // NOTE: Firefox keeps xany.serial and xany.window as 0.

  int modifier_state = GetXModifierState(event.modifiers);

  Window root = GDK_ROOT_WINDOW();
  switch (event.type) {
    case WebInputEvent::MouseMove: {
      np_event->type = MotionNotify;
      XMotionEvent& motion_event = np_event->xmotion;
      motion_event.root = root;
      motion_event.time = timestamp;
      motion_event.x = event.x;
      motion_event.y = event.y;
      motion_event.x_root = event.globalX;
      motion_event.y_root = event.globalY;
      motion_event.state = modifier_state;
      motion_event.is_hint = NotifyNormal;
      motion_event.same_screen = True;
      break;
    }
    case WebInputEvent::MouseLeave:
    case WebInputEvent::MouseEnter: {
      if (event.type == WebInputEvent::MouseEnter) {
        np_event->type = EnterNotify;
      } else {
        np_event->type = LeaveNotify;
      }
      XCrossingEvent& crossing_event = np_event->xcrossing;
      crossing_event.root = root;
      crossing_event.time = timestamp;
      crossing_event.x = event.x;
      crossing_event.y = event.y;
      crossing_event.x_root = event.globalX;
      crossing_event.y_root = event.globalY;
      crossing_event.mode = -1;  // This is what Firefox sets it to.
      crossing_event.detail = NotifyDetailNone;
      crossing_event.same_screen = True;
      // TODO(piman@google.com): set this to the correct value. Firefox does. I
      // don't know where to get the information though, we get focus
      // notifications, but no unfocus.
      crossing_event.focus = 0;
      crossing_event.state = modifier_state;
      break;
    }
    case WebInputEvent::MouseUp:
    case WebInputEvent::MouseDown: {
      if (event.type == WebInputEvent::MouseDown) {
        np_event->type = ButtonPress;
      } else {
        np_event->type = ButtonRelease;
      }
      XButtonEvent& button_event = np_event->xbutton;
      button_event.root = root;
      button_event.time = timestamp;
      button_event.x = event.x;
      button_event.y = event.y;
      button_event.x_root = event.globalX;
      button_event.y_root = event.globalY;
      button_event.state = modifier_state;
      switch (event.button) {
        case WebMouseEvent::ButtonLeft:
          button_event.button = Button1;
          break;
        case WebMouseEvent::ButtonMiddle:
          button_event.button = Button2;
          break;
        case WebMouseEvent::ButtonRight:
          button_event.button = Button3;
          break;
        default:
          NOTREACHED();
      }
      button_event.same_screen = True;
      break;
    }
    default:
      NOTREACHED();
      return false;
  }
  return true;
}

static bool NPEventFromWebKeyboardEvent(const WebKeyboardEvent& event,
                                        Time timestamp,
                                        NPEvent* np_event) {
  np_event->xany.display = GDK_DISPLAY();
  // NOTE: Firefox keeps xany.serial and xany.window as 0.

  switch (event.type) {
    case WebKeyboardEvent::KeyDown:
      np_event->type = KeyPress;
      break;
    case WebKeyboardEvent::KeyUp:
      np_event->type = KeyRelease;
      break;
    default:
      NOTREACHED();
      return false;
  }
  XKeyEvent& key_event = np_event->xkey;
  key_event.send_event = False;
  key_event.display = GDK_DISPLAY();
  // NOTE: Firefox keeps xany.serial and xany.window as 0.
  // TODO(piman@google.com): is this right for multiple screens ?
  key_event.root = DefaultRootWindow(key_event.display);
  key_event.time = timestamp;
  // NOTE: We don't have the correct information for x/y/x_root/y_root. Firefox
  // doesn't have it either, so we pass the same values.
  key_event.x = 0;
  key_event.y = 0;
  key_event.x_root = -1;
  key_event.y_root = -1;
  key_event.state = GetXModifierState(event.modifiers);
  key_event.keycode = event.nativeKeyCode;
  key_event.same_screen = True;
  return true;
}

static bool NPEventFromWebInputEvent(const WebInputEvent& event,
                                     Time timestamp,
                                     NPEvent* np_event) {
  switch (event.type) {
    case WebInputEvent::MouseMove:
    case WebInputEvent::MouseLeave:
    case WebInputEvent::MouseEnter:
    case WebInputEvent::MouseDown:
    case WebInputEvent::MouseUp:
      if (event.size < sizeof(WebMouseEvent)) {
        NOTREACHED();
        return false;
      }
      return NPEventFromWebMouseEvent(
          *static_cast<const WebMouseEvent*>(&event), timestamp, np_event);
    case WebInputEvent::KeyDown:
    case WebInputEvent::KeyUp:
      if (event.size < sizeof(WebKeyboardEvent)) {
        NOTREACHED();
        return false;
      }
      return NPEventFromWebKeyboardEvent(
          *static_cast<const WebKeyboardEvent*>(&event), timestamp, np_event);
    default:
      return false;
  }
}

bool WebPluginDelegateImpl::PlatformHandleInputEvent(
    const WebInputEvent& event, WebCursor::CursorInfo* cursor_info) {

  if (first_event_time_ < 0.0)
    first_event_time_ = event.timeStampSeconds;
  Time timestamp = static_cast<Time>(
      (event.timeStampSeconds - first_event_time_) * 1.0e3);
  NPEvent np_event = {0};
  if (!NPEventFromWebInputEvent(event, timestamp, &np_event)) {
    return false;
  }
  // See comment about PLUGIN_QUIRK_WINDOWLESS_NO_RIGHT_CLICK in constructor.
  if (windowless_ &&
      (quirks_ & PLUGIN_QUIRK_WINDOWLESS_NO_RIGHT_CLICK) &&
      (np_event.type == ButtonPress || np_event.type == ButtonRelease) &&
      (np_event.xbutton.button == Button3)) {
    return false;
  }

  bool ret = instance()->NPP_HandleEvent(&np_event) != 0;

  // Flash always returns false, even when the event is handled.
  ret = true;

#if 0
  if (event->event == WM_MOUSEMOVE) {
    // Snag a reference to the current cursor ASAP in case the plugin modified
    // it. There is a nasty race condition here with the multiprocess browser
    // as someone might be setting the cursor in the main process as well.
    *cursor = current_windowless_cursor_;
  }
#endif

  return ret;
}

}  // namespace content