Initial NPAPI plugin support in Win Aura.

content/browser/renderer_host/render_widget_host_view_base.cc

Index: content/browser/renderer_host/render_widget_host_view_base.cc
===================================================================
--- content/browser/renderer_host/render_widget_host_view_base.cc	(revision 156019)
+++ content/browser/renderer_host/render_widget_host_view_base.cc	(working copy)
@@ -12,6 +12,21 @@
 #include "ui/gfx/display.h"
 #include "ui/gfx/screen.h"
 
+#if defined(OS_WIN)
+#include "base/command_line.h"
+#include "base/message_loop.h"
+#include "base/win/wrapped_window_proc.h"
+#include "content/browser/plugin_process_host.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/child_process_data.h"
+#include "content/public/common/content_switches.h"
+#include "ui/base/win/hwnd_util.h"
+#include "ui/gfx/gdi_util.h"
+#include "webkit/plugins/npapi/plugin_constants_win.h"
+#include "webkit/plugins/npapi/webplugin.h"
+#include "webkit/plugins/npapi/webplugin_delegate_impl.h"
+#endif
+
 #if defined(TOOLKIT_GTK)
 #include <gdk/gdkx.h>
 #include <gtk/gtk.h>
@@ -39,6 +54,260 @@
   return FromRWHV(RenderWidgetHostView::CreateViewForWidget(widget));
 }
 
+#if defined(OS_WIN)
+
+namespace {
+
+// |window| is the plugin HWND, created and destroyed in the plugin process.
+// |parent| is the parent HWND, created and destroyed on the browser UI thread.
+void NotifyPluginProcessHostHelper(HWND window, HWND parent, int tries) {
+  // How long to wait between each try.
+  static const int kTryDelayMs = 200;
+
+  DWORD plugin_process_id;
+  bool found_starting_plugin_process = false;
+  GetWindowThreadProcessId(window, &plugin_process_id);
+  for (PluginProcessHostIterator iter; !iter.Done(); ++iter) {
+    if (!iter.GetData().handle) {
+      found_starting_plugin_process = true;
+      continue;
+    }
+    if (base::GetProcId(iter.GetData().handle) == plugin_process_id) {
+      iter->AddWindow(parent);
+      return;
+    }
+  }
+
+  if (found_starting_plugin_process) {
+    // A plugin process has started but we don't have its handle yet.  Since
+    // it's most likely the one for this plugin, try a few more times after a
+    // delay.
+    if (tries > 0) {
+      MessageLoop::current()->PostDelayedTask(
+          FROM_HERE,
+          base::Bind(&NotifyPluginProcessHostHelper, window, parent, tries - 1),
+          base::TimeDelta::FromMilliseconds(kTryDelayMs));
+      return;
+    }
+  }
+
+  // The plugin process might have died in the time to execute the task, don't
+  // leak the HWND.
+  PostMessage(parent, WM_CLOSE, 0, 0);
+}
+
+// The plugin wrapper window which lives in the browser process has this proc
+// as its window procedure. We only handle the WM_PARENTNOTIFY message sent by
+// windowed plugins for mouse input. This is forwarded off to the wrappers
+// parent which is typically the RVH window which turns on user gesture.
+LRESULT CALLBACK PluginWrapperWindowProc(HWND window, unsigned int message,
+                                         WPARAM wparam, LPARAM lparam) {
+  if (message == WM_PARENTNOTIFY) {
+    switch (LOWORD(wparam)) {
+      case WM_LBUTTONDOWN:
+      case WM_RBUTTONDOWN:
+      case WM_MBUTTONDOWN:
+        ::SendMessage(GetParent(window), message, wparam, lparam);
+        return 0;
+      default:
+        break;
+    }
+  }
+  return ::DefWindowProc(window, message, wparam, lparam);
+}
+
+// Create an intermediate window between the given HWND and its parent.
+HWND ReparentWindow(HWND window) {
+  static ATOM atom = 0;
+  static HMODULE instance = NULL;
+  if (!atom) {
+    WNDCLASSEX window_class;
+    base::win::InitializeWindowClass(
+        webkit::npapi::kWrapperNativeWindowClassName,
+        &base::win::WrappedWindowProc<PluginWrapperWindowProc>,
+        CS_DBLCLKS,
+        0,
+        0,
+        NULL,
+        // xxx reinterpret_cast<HBRUSH>(COLOR_WINDOW+1),
+        reinterpret_cast<HBRUSH>(COLOR_GRAYTEXT+1),
+        NULL,
+        NULL,
+        NULL,
+        &window_class);
+    instance = window_class.hInstance;
+    atom = RegisterClassEx(&window_class);
+  }
+  DCHECK(atom);
+
+  HWND orig_parent = ::GetParent(window);
+  HWND parent = CreateWindowEx(
+      WS_EX_LEFT | WS_EX_LTRREADING | WS_EX_RIGHTSCROLLBAR,
+      MAKEINTATOM(atom), 0,
+      WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
+      0, 0, 0, 0, orig_parent, 0, instance, 0);
+  ui::CheckWindowCreated(parent);
+  // If UIPI is enabled we need to add message filters for parents with
+  // children that cross process boundaries.
+  if (::GetPropW(orig_parent, webkit::npapi::kNativeWindowClassFilterProp)) {
+    // Process-wide message filters required on Vista must be added to:
+    // chrome_content_client.cc ChromeContentClient::SandboxPlugin
+    ChangeWindowMessageFilterEx(parent, WM_MOUSEWHEEL, MSGFLT_ALLOW, NULL);
+    ChangeWindowMessageFilterEx(parent, WM_GESTURE, MSGFLT_ALLOW, NULL);
+    ChangeWindowMessageFilterEx(parent, WM_APPCOMMAND, MSGFLT_ALLOW, NULL);
+    ::RemovePropW(orig_parent, webkit::npapi::kNativeWindowClassFilterProp);
+  }
+  ::SetParent(window, parent);
+  // How many times we try to find a PluginProcessHost whose process matches
+  // the HWND.
+  static const int kMaxTries = 5;
+  BrowserThread::PostTask(
+      BrowserThread::IO,
+      FROM_HERE,
+      base::Bind(&NotifyPluginProcessHostHelper, window, parent, kMaxTries));
+  return parent;
+}
+
+BOOL CALLBACK PainEnumChildProc(HWND hwnd, LPARAM lparam) {
+  if (!webkit::npapi::WebPluginDelegateImpl::IsPluginDelegateWindow(hwnd))
+    return TRUE;
+
+  gfx::Rect* rect = reinterpret_cast<gfx::Rect*>(lparam);
+  static UINT msg = RegisterWindowMessage(webkit::npapi::kPaintMessageName);
+  WPARAM wparam = rect->x() << 16 | rect->y();
+  lparam = rect->width() << 16 | rect->height();
+
+  // SendMessage gets the message across much quicker than PostMessage, since it
+  // doesn't get queued.  When the plugin thread calls PeekMessage or other
+  // Win32 APIs, sent messages are dispatched automatically.
+  SendNotifyMessage(hwnd, msg, wparam, lparam);
+
+  return TRUE;
+}
+
+}  // namespace
+
+// static
+void RenderWidgetHostViewBase::MovePluginWindowsHelper(
+    HWND parent,
+    const std::vector<webkit::npapi::WebPluginGeometry>& moves) {
+  if (moves.empty())
+    return;
+
+  bool oop_plugins =
+    !CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess) &&
+    !CommandLine::ForCurrentProcess()->HasSwitch(switches::kInProcessPlugins);
+
+  HDWP defer_window_pos_info =
+      ::BeginDeferWindowPos(static_cast<int>(moves.size()));
+
+  if (!defer_window_pos_info) {
+    NOTREACHED();
+    return;
+  }
+
+  for (size_t i = 0; i < moves.size(); ++i) {
+    unsigned long flags = 0;
+    const webkit::npapi::WebPluginGeometry& move = moves[i];
+    HWND window = move.window;
+
+    // As the plugin parent window which lives on the browser UI thread is
+    // destroyed asynchronously, it is possible that we have a stale window
+    // sent in by the renderer for moving around.
+    // Note: get the parent before checking if the window is valid, to avoid a
+    // race condition where the window is destroyed after the check but before
+    // the GetParent call.
+    HWND cur_parent = ::GetParent(window);
+    if (!::IsWindow(window))
+      continue;
+
+    if (oop_plugins) {
+      if (cur_parent == parent) {
+        // The plugin window is a direct child of this window, add an
+        // intermediate window that lives on this thread to speed up scrolling.
+        // Note this only works with out of process plugins since we depend on
+        // PluginProcessHost to destroy the intermediate HWNDs.
+        cur_parent = ReparentWindow(window);
+        ::ShowWindow(window, SW_SHOW);  // Window was created hidden.
+      } else if (::GetParent(cur_parent) != parent) {
+        // The renderer should only be trying to move windows that are children
+        // of its render widget window. However, this may happen as a result of
+        // a race condition, so we ignore it and not kill the plugin process.
+        continue;
+      }
+
+      // We move the intermediate parent window which doesn't result in cross-
+      // process synchronous Windows messages.
+      window = cur_parent;
+    }
+
+    if (move.visible)
+      flags |= SWP_SHOWWINDOW;
+    else
+      flags |= SWP_HIDEWINDOW;
+
+#if defined(USE_AURA)
+    // Without this flag, Windows repaints the parent area uncovered by this
+    // move. However it only looks at the plugin rectangle and ignores the
+    // clipping region. In Aura, the browser chrome could be under the plugin,
+    // and if Windows tries to paint it synchronously inside EndDeferWindowsPos
+    // then it won't have the data and it will flash white. So instead we
+    // manually redraw the plugin.
+    // Why not do this for native Windows? Not sure if there are any performance
+    // issues with this.
+    flags |= SWP_NOREDRAW;
+#endif
+
+    if (move.rects_valid) {
+      HRGN hrgn = ::CreateRectRgn(move.clip_rect.x(),
+                                  move.clip_rect.y(),
+                                  move.clip_rect.right(),
+                                  move.clip_rect.bottom());
+      gfx::SubtractRectanglesFromRegion(hrgn, move.cutout_rects);
+
+      // Note: System will own the hrgn after we call SetWindowRgn,
+      // so we don't need to call DeleteObject(hrgn)
+      ::SetWindowRgn(window, hrgn, !move.clip_rect.IsEmpty());
+    } else {
+      flags |= SWP_NOMOVE;
+      flags |= SWP_NOSIZE;
+    }
+
+    defer_window_pos_info = ::DeferWindowPos(defer_window_pos_info,
+                                             window, NULL,
+                                             move.window_rect.x(),
+                                             move.window_rect.y(),
+                                             move.window_rect.width(),
+                                             move.window_rect.height(), flags);
+
+    if (!defer_window_pos_info) {
+      DCHECK(false) << "DeferWindowPos failed, so all plugin moves ignored.";
+      return;
+    }
+  }
+
+  ::EndDeferWindowPos(defer_window_pos_info);
+
+#if defined(USE_AURA)
+  for (size_t i = 0; i < moves.size(); ++i) {
+    const webkit::npapi::WebPluginGeometry& move = moves[i];
+    RECT r;
+    GetWindowRect(move.window, &r);
+    gfx::Rect gr(r);
+    PainEnumChildProc(move.window, reinterpret_cast<LPARAM>(&gr));
+  }
+#endif
+}
+
+// static
+void RenderWidgetHostViewBase::PaintPluginWindowsHelper(
+    HWND parent, const gfx::Rect& damaged_screen_rect) {
+  LPARAM lparam = reinterpret_cast<LPARAM>(&damaged_screen_rect);
+  EnumChildWindows(parent, PainEnumChildProc, lparam);
+}
+
+#endif  // OS_WIN
+
 RenderWidgetHostViewBase::RenderWidgetHostViewBase()
     : popup_type_(WebKit::WebPopupTypeNone),
       mouse_locked_(false),