src/content/browser/renderer_host/render_widget_host_view_base.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/renderer_host/render_widget_host_view_base.h"
   6
   7 #include "base/logging.h"
   8 #include "content/browser/accessibility/browser_accessibility_manager.h"
   9 #include "content/browser/gpu/gpu_data_manager_impl.h"
  10 #include "content/browser/renderer_host/input/synthetic_gesture_target_base.h"
  11 #include "content/browser/renderer_host/render_process_host_impl.h"
  12 #include "content/browser/renderer_host/render_widget_host_impl.h"
  13 #include "content/common/content_switches_internal.h"
  14 #include "content/public/browser/render_widget_host_view_frame_subscriber.h"
  15 #include "ui/gfx/display.h"
  16 #include "ui/gfx/screen.h"
  17 #include "ui/gfx/size_conversions.h"
  18 #include "ui/gfx/size_f.h"
  19
  20 #if defined(OS_WIN)
  21 #include "base/command_line.h"
  22 #include "base/message_loop/message_loop.h"
  23 #include "base/win/wrapped_window_proc.h"
  24 #include "content/browser/plugin_process_host.h"
  25 #include "content/browser/plugin_service_impl.h"
  26 #include "content/common/plugin_constants_win.h"
  27 #include "content/common/webplugin_geometry.h"
  28 #include "content/public/browser/browser_thread.h"
  29 #include "content/public/browser/child_process_data.h"
  30 #include "content/public/common/content_switches.h"
  31 #include "ui/gfx/gdi_util.h"
  32 #include "ui/gfx/win/dpi.h"
  33 #include "ui/gfx/win/hwnd_util.h"
  34 #endif
  35
  36 namespace content {
  37
  38 #if defined(OS_WIN)
  39
  40 namespace {
  41
  42 // |window| is the plugin HWND, created and destroyed in the plugin process.
  43 // |parent| is the parent HWND, created and destroyed on the browser UI thread.
  44 void NotifyPluginProcessHostHelper(HWND window, HWND parent, int tries) {
  45   // How long to wait between each try.
  46   static const int kTryDelayMs = 200;
  47
  48   DWORD plugin_process_id;
  49   bool found_starting_plugin_process = false;
  50   GetWindowThreadProcessId(window, &plugin_process_id);
  51   for (PluginProcessHostIterator iter; !iter.Done(); ++iter) {
  52     if (!iter.GetData().handle) {
  53       found_starting_plugin_process = true;
  54       continue;
  55     }
  56     if (base::GetProcId(iter.GetData().handle) == plugin_process_id) {
  57       iter->AddWindow(parent);
  58       return;
  59     }
  60   }
  61
  62   if (found_starting_plugin_process) {
  63     // A plugin process has started but we don't have its handle yet.  Since
  64     // it's most likely the one for this plugin, try a few more times after a
  65     // delay.
  66     if (tries > 0) {
  67       base::MessageLoop::current()->PostDelayedTask(
  68           FROM_HERE,
  69           base::Bind(&NotifyPluginProcessHostHelper, window, parent, tries - 1),
  70           base::TimeDelta::FromMilliseconds(kTryDelayMs));
  71       return;
  72     }
  73   }
  74
  75   // The plugin process might have died in the time to execute the task, don't
  76   // leak the HWND.
  77   PostMessage(parent, WM_CLOSE, 0, 0);
  78 }
  79
  80 // The plugin wrapper window which lives in the browser process has this proc
  81 // as its window procedure. We only handle the WM_PARENTNOTIFY message sent by
  82 // windowed plugins for mouse input. This is forwarded off to the wrappers
  83 // parent which is typically the RVH window which turns on user gesture.
  84 LRESULT CALLBACK PluginWrapperWindowProc(HWND window, unsigned int message,
  85                                          WPARAM wparam, LPARAM lparam) {
  86   if (message == WM_PARENTNOTIFY) {
  87     switch (LOWORD(wparam)) {
  88       case WM_LBUTTONDOWN:
  89       case WM_RBUTTONDOWN:
  90       case WM_MBUTTONDOWN:
  91         ::SendMessage(GetParent(window), message, wparam, lparam);
  92         return 0;
  93       default:
  94         break;
  95     }
  96   }
  97   return ::DefWindowProc(window, message, wparam, lparam);
  98 }
  99
 100 bool IsPluginWrapperWindow(HWND window) {
 101   return gfx::GetClassNameW(window) ==
 102       base::string16(kWrapperNativeWindowClassName);
 103 }
 104
 105 // Create an intermediate window between the given HWND and its parent.
 106 HWND ReparentWindow(HWND window, HWND parent) {
 107   static ATOM atom = 0;
 108   static HMODULE instance = NULL;
 109   if (!atom) {
 110     WNDCLASSEX window_class;
 111     base::win::InitializeWindowClass(
 112         kWrapperNativeWindowClassName,
 113         &base::win::WrappedWindowProc<PluginWrapperWindowProc>,
 114         CS_DBLCLKS,
 115         0,
 116         0,
 117         NULL,
 118         // xxx reinterpret_cast<HBRUSH>(COLOR_WINDOW+1),
 119         reinterpret_cast<HBRUSH>(COLOR_GRAYTEXT+1),
 120         NULL,
 121         NULL,
 122         NULL,
 123         &window_class);
 124     instance = window_class.hInstance;
 125     atom = RegisterClassEx(&window_class);
 126   }
 127   DCHECK(atom);
 128
 129   HWND new_parent = CreateWindowEx(
 130       WS_EX_LEFT | WS_EX_LTRREADING | WS_EX_RIGHTSCROLLBAR,
 131       MAKEINTATOM(atom), 0,
 132       WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
 133       0, 0, 0, 0, parent, 0, instance, 0);
 134   gfx::CheckWindowCreated(new_parent);
 135   ::SetParent(window, new_parent);
 136   // How many times we try to find a PluginProcessHost whose process matches
 137   // the HWND.
 138   static const int kMaxTries = 5;
 139   BrowserThread::PostTask(
 140       BrowserThread::IO,
 141       FROM_HERE,
 142       base::Bind(&NotifyPluginProcessHostHelper, window, new_parent,
 143                  kMaxTries));
 144   return new_parent;
 145 }
 146
 147 BOOL CALLBACK PaintEnumChildProc(HWND hwnd, LPARAM lparam) {
 148   if (!PluginServiceImpl::GetInstance()->IsPluginWindow(hwnd))
 149     return TRUE;
 150
 151   gfx::Rect* rect = reinterpret_cast<gfx::Rect*>(lparam);
 152   gfx::Rect rect_in_pixels = gfx::win::DIPToScreenRect(*rect);
 153   static UINT msg = RegisterWindowMessage(kPaintMessageName);
 154   WPARAM wparam = MAKEWPARAM(rect_in_pixels.x(), rect_in_pixels.y());
 155   lparam = MAKELPARAM(rect_in_pixels.width(), rect_in_pixels.height());
 156
 157   // SendMessage gets the message across much quicker than PostMessage, since it
 158   // doesn't get queued.  When the plugin thread calls PeekMessage or other
 159   // Win32 APIs, sent messages are dispatched automatically.
 160   SendNotifyMessage(hwnd, msg, wparam, lparam);
 161
 162   return TRUE;
 163 }
 164
 165 // Windows callback for OnDestroy to detach the plugin windows.
 166 BOOL CALLBACK DetachPluginWindowsCallbackInternal(HWND window, LPARAM param) {
 167   RenderWidgetHostViewBase::DetachPluginWindowsCallback(window);
 168   return TRUE;
 169 }
 170
 171 }  // namespace
 172
 173 // static
 174 void RenderWidgetHostViewBase::DetachPluginWindowsCallback(HWND window) {
 175   if (PluginServiceImpl::GetInstance()->IsPluginWindow(window) &&
 176       !IsHungAppWindow(window)) {
 177     ::ShowWindow(window, SW_HIDE);
 178     SetParent(window, NULL);
 179   }
 180 }
 181
 182 // static
 183 void RenderWidgetHostViewBase::MovePluginWindowsHelper(
 184     HWND parent,
 185     const std::vector<WebPluginGeometry>& moves) {
 186   if (moves.empty())
 187     return;
 188
 189   bool oop_plugins =
 190     !CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess);
 191
 192   HDWP defer_window_pos_info =
 193       ::BeginDeferWindowPos(static_cast<int>(moves.size()));
 194
 195   if (!defer_window_pos_info) {
 196     NOTREACHED();
 197     return;
 198   }
 199
 200 #if defined(USE_AURA)
 201   std::vector<RECT> invalidate_rects;
 202 #endif
 203
 204   for (size_t i = 0; i < moves.size(); ++i) {
 205     unsigned long flags = 0;
 206     const WebPluginGeometry& move = moves[i];
 207     HWND window = move.window;
 208
 209     // As the plugin parent window which lives on the browser UI thread is
 210     // destroyed asynchronously, it is possible that we have a stale window
 211     // sent in by the renderer for moving around.
 212     // Note: get the parent before checking if the window is valid, to avoid a
 213     // race condition where the window is destroyed after the check but before
 214     // the GetParent call.
 215     HWND cur_parent = ::GetParent(window);
 216     if (!::IsWindow(window))
 217       continue;
 218
 219     if (!PluginServiceImpl::GetInstance()->IsPluginWindow(window)) {
 220       // The renderer should only be trying to move plugin windows. However,
 221       // this may happen as a result of a race condition (i.e. even after the
 222       // check right above), so we ignore it.
 223       continue;
 224     }
 225
 226     if (oop_plugins) {
 227       if (cur_parent == GetDesktopWindow()) {
 228         // The plugin window hasn't been parented yet, add an intermediate
 229         // window that lives on this thread to speed up scrolling. Note this
 230         // only works with out of process plugins since we depend on
 231         // PluginProcessHost to destroy the intermediate HWNDs.
 232         cur_parent = ReparentWindow(window, parent);
 233         ::ShowWindow(window, SW_SHOW);  // Window was created hidden.
 234       } else if (!IsPluginWrapperWindow(cur_parent)) {
 235         continue;  // Race if plugin process is shutting down.
 236       }
 237
 238       // We move the intermediate parent window which doesn't result in cross-
 239       // process synchronous Windows messages.
 240       window = cur_parent;
 241     } else {
 242       if (cur_parent == GetDesktopWindow())
 243         SetParent(window, parent);
 244     }
 245
 246     if (move.visible)
 247       flags |= SWP_SHOWWINDOW;
 248     else
 249       flags |= SWP_HIDEWINDOW;
 250
 251 #if defined(USE_AURA)
 252     if (GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor()) {
 253       // Without this flag, Windows repaints the parent area uncovered by this
 254       // move. However when software compositing is used the clipping region is
 255       // ignored. Since in Aura the browser chrome could be under the plugin, if
 256       // if Windows tries to paint it synchronously inside EndDeferWindowsPos
 257       // then it won't have the data and it will flash white. So instead we
 258       // manually redraw the plugin.
 259       // Why not do this for native Windows? Not sure if there are any
 260       // performance issues with this.
 261       flags |= SWP_NOREDRAW;
 262     }
 263 #endif
 264
 265     if (move.rects_valid) {
 266       gfx::Rect clip_rect_in_pixel = gfx::win::DIPToScreenRect(move.clip_rect);
 267       HRGN hrgn = ::CreateRectRgn(clip_rect_in_pixel.x(),
 268                                   clip_rect_in_pixel.y(),
 269                                   clip_rect_in_pixel.right(),
 270                                   clip_rect_in_pixel.bottom());
 271       gfx::SubtractRectanglesFromRegion(hrgn, move.cutout_rects);
 272
 273       // Note: System will own the hrgn after we call SetWindowRgn,
 274       // so we don't need to call DeleteObject(hrgn)
 275       ::SetWindowRgn(window, hrgn,
 276                      !move.clip_rect.IsEmpty() && (flags & SWP_NOREDRAW) == 0);
 277
 278 #if defined(USE_AURA)
 279       // When using the software compositor, if the clipping rectangle is empty
 280       // then DeferWindowPos won't redraw the newly uncovered area under the
 281       // plugin.
 282       if (clip_rect_in_pixel.IsEmpty() &&
 283           !GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor()) {
 284         RECT r;
 285         GetClientRect(window, &r);
 286         MapWindowPoints(window, parent, reinterpret_cast<POINT*>(&r), 2);
 287         invalidate_rects.push_back(r);
 288       }
 289 #endif
 290     } else {
 291       flags |= SWP_NOMOVE;
 292       flags |= SWP_NOSIZE;
 293     }
 294
 295     gfx::Rect window_rect_in_pixel =
 296         gfx::win::DIPToScreenRect(move.window_rect);
 297     defer_window_pos_info = ::DeferWindowPos(defer_window_pos_info,
 298                                              window, NULL,
 299                                              window_rect_in_pixel.x(),
 300                                              window_rect_in_pixel.y(),
 301                                              window_rect_in_pixel.width(),
 302                                              window_rect_in_pixel.height(),
 303                                              flags);
 304
 305     if (!defer_window_pos_info) {
 306       DCHECK(false) << "DeferWindowPos failed, so all plugin moves ignored.";
 307       return;
 308     }
 309   }
 310
 311   ::EndDeferWindowPos(defer_window_pos_info);
 312
 313 #if defined(USE_AURA)
 314   if (GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor()) {
 315     for (size_t i = 0; i < moves.size(); ++i) {
 316       const WebPluginGeometry& move = moves[i];
 317       RECT r;
 318       GetWindowRect(move.window, &r);
 319       gfx::Rect gr(r);
 320       PaintEnumChildProc(move.window, reinterpret_cast<LPARAM>(&gr));
 321     }
 322   } else {
 323       for (size_t i = 0; i < invalidate_rects.size(); ++i) {
 324       ::RedrawWindow(
 325           parent, &invalidate_rects[i], NULL,
 326           // These flags are from WebPluginDelegateImpl::NativeWndProc.
 327           RDW_INVALIDATE | RDW_ALLCHILDREN | RDW_FRAME | RDW_UPDATENOW);
 328     }
 329   }
 330 #endif
 331 }
 332
 333 // static
 334 void RenderWidgetHostViewBase::PaintPluginWindowsHelper(
 335     HWND parent, const gfx::Rect& damaged_screen_rect) {
 336   LPARAM lparam = reinterpret_cast<LPARAM>(&damaged_screen_rect);
 337   EnumChildWindows(parent, PaintEnumChildProc, lparam);
 338 }
 339
 340 // static
 341 void RenderWidgetHostViewBase::DetachPluginsHelper(HWND parent) {
 342   // When a tab is closed all its child plugin windows are destroyed
 343   // automatically. This happens before plugins get any notification that its
 344   // instances are tearing down.
 345   //
 346   // Plugins like Quicktime assume that their windows will remain valid as long
 347   // as they have plugin instances active. Quicktime crashes in this case
 348   // because its windowing code cleans up an internal data structure that the
 349   // handler for NPP_DestroyStream relies on.
 350   //
 351   // The fix is to detach plugin windows from web contents when it is going
 352   // away. This will prevent the plugin windows from getting destroyed
 353   // automatically. The detached plugin windows will get cleaned up in proper
 354   // sequence as part of the usual cleanup when the plugin instance goes away.
 355   EnumChildWindows(parent, DetachPluginWindowsCallbackInternal, NULL);
 356 }
 357
 358 #endif  // OS_WIN
 359
 360 namespace {
 361
 362 // How many microseconds apart input events should be flushed.
 363 const int kFlushInputRateInUs = 16666;
 364
 365 }
 366
 367 RenderWidgetHostViewBase::RenderWidgetHostViewBase()
 368     : popup_type_(blink::WebPopupTypeNone),
 369       background_opaque_(true),
 370       mouse_locked_(false),
 371       showing_context_menu_(false),
 372       selection_text_offset_(0),
 373       selection_range_(gfx::Range::InvalidRange()),
 374       current_device_scale_factor_(0),
 375       current_display_rotation_(gfx::Display::ROTATE_0),
 376       pinch_zoom_enabled_(content::IsPinchToZoomEnabled()),
 377       renderer_frame_number_(0) {
 378 }
 379
 380 RenderWidgetHostViewBase::~RenderWidgetHostViewBase() {
 381   DCHECK(!mouse_locked_);
 382 }
 383
 384 bool RenderWidgetHostViewBase::OnMessageReceived(const IPC::Message& msg){
 385   return false;
 386 }
 387
 388 void RenderWidgetHostViewBase::SetBackgroundOpaque(bool opaque) {
 389   background_opaque_ = opaque;
 390 }
 391
 392 bool RenderWidgetHostViewBase::GetBackgroundOpaque() {
 393   return background_opaque_;
 394 }
 395
 396 gfx::Size RenderWidgetHostViewBase::GetPhysicalBackingSize() const {
 397   gfx::NativeView view = GetNativeView();
 398   gfx::Display display =
 399       gfx::Screen::GetScreenFor(view)->GetDisplayNearestWindow(view);
 400   return gfx::ToCeiledSize(gfx::ScaleSize(GetRequestedRendererSize(),
 401                                           display.device_scale_factor()));
 402 }
 403
 404 float RenderWidgetHostViewBase::GetOverdrawBottomHeight() const {
 405   return 0.f;
 406 }
 407
 408 void RenderWidgetHostViewBase::SelectionChanged(const base::string16& text,
 409                                                 size_t offset,
 410                                                 const gfx::Range& range) {
 411   selection_text_ = text;
 412   selection_text_offset_ = offset;
 413   selection_range_.set_start(range.start());
 414   selection_range_.set_end(range.end());
 415 }
 416
 417 gfx::Size RenderWidgetHostViewBase::GetRequestedRendererSize() const {
 418   return GetViewBounds().size();
 419 }
 420
 421 ui::TextInputClient* RenderWidgetHostViewBase::GetTextInputClient() {
 422   NOTREACHED();
 423   return NULL;
 424 }
 425
 426 bool RenderWidgetHostViewBase::IsShowingContextMenu() const {
 427   return showing_context_menu_;
 428 }
 429
 430 void RenderWidgetHostViewBase::SetShowingContextMenu(bool showing) {
 431   DCHECK_NE(showing_context_menu_, showing);
 432   showing_context_menu_ = showing;
 433 }
 434
 435 base::string16 RenderWidgetHostViewBase::GetSelectedText() const {
 436   if (!selection_range_.IsValid())
 437     return base::string16();
 438   return selection_text_.substr(
 439       selection_range_.GetMin() - selection_text_offset_,
 440       selection_range_.length());
 441 }
 442
 443 bool RenderWidgetHostViewBase::IsMouseLocked() {
 444   return mouse_locked_;
 445 }
 446
 447 InputEventAckState RenderWidgetHostViewBase::FilterInputEvent(
 448     const blink::WebInputEvent& input_event) {
 449   // By default, input events are simply forwarded to the renderer.
 450   return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
 451 }
 452
 453 void RenderWidgetHostViewBase::OnDidFlushInput() {
 454   // The notification can safely be ignored by most implementations.
 455 }
 456
 457 void RenderWidgetHostViewBase::OnSetNeedsFlushInput() {
 458   if (flush_input_timer_.IsRunning())
 459     return;
 460
 461   flush_input_timer_.Start(
 462       FROM_HERE,
 463       base::TimeDelta::FromMicroseconds(kFlushInputRateInUs),
 464       this,
 465       &RenderWidgetHostViewBase::FlushInput);
 466 }
 467
 468 void RenderWidgetHostViewBase::WheelEventAck(
 469     const blink::WebMouseWheelEvent& event,
 470     InputEventAckState ack_result) {
 471 }
 472
 473 void RenderWidgetHostViewBase::GestureEventAck(
 474     const blink::WebGestureEvent& event,
 475     InputEventAckState ack_result) {
 476 }
 477
 478 void RenderWidgetHostViewBase::SetPopupType(blink::WebPopupType popup_type) {
 479   popup_type_ = popup_type;
 480 }
 481
 482 blink::WebPopupType RenderWidgetHostViewBase::GetPopupType() {
 483   return popup_type_;
 484 }
 485
 486 BrowserAccessibilityManager*
 487 RenderWidgetHostViewBase::CreateBrowserAccessibilityManager(
 488     BrowserAccessibilityDelegate* delegate) {
 489   NOTREACHED();
 490   return NULL;
 491 }
 492
 493 void RenderWidgetHostViewBase::AccessibilityShowMenu(const gfx::Point& point) {
 494 }
 495
 496 gfx::Point RenderWidgetHostViewBase::AccessibilityOriginInScreen(
 497     const gfx::Rect& bounds) {
 498   return bounds.origin();
 499 }
 500
 501 gfx::AcceleratedWidget
 502     RenderWidgetHostViewBase::AccessibilityGetAcceleratedWidget() {
 503   return gfx::kNullAcceleratedWidget;
 504 }
 505
 506 gfx::NativeViewAccessible
 507     RenderWidgetHostViewBase::AccessibilityGetNativeViewAccessible() {
 508   return NULL;
 509 }
 510
 511 void RenderWidgetHostViewBase::UpdateScreenInfo(gfx::NativeView view) {
 512   RenderWidgetHostImpl* impl = NULL;
 513   if (GetRenderWidgetHost())
 514     impl = RenderWidgetHostImpl::From(GetRenderWidgetHost());
 515
 516   if (impl)
 517     impl->SendScreenRects();
 518
 519   if (HasDisplayPropertyChanged(view) && impl)
 520     impl->NotifyScreenInfoChanged();
 521 }
 522
 523 bool RenderWidgetHostViewBase::HasDisplayPropertyChanged(gfx::NativeView view) {
 524   gfx::Display display =
 525       gfx::Screen::GetScreenFor(view)->GetDisplayNearestWindow(view);
 526   if (current_display_area_ == display.work_area() &&
 527       current_device_scale_factor_ == display.device_scale_factor() &&
 528       current_display_rotation_ == display.rotation()) {
 529     return false;
 530   }
 531
 532   current_display_area_ = display.work_area();
 533   current_device_scale_factor_ = display.device_scale_factor();
 534   current_display_rotation_ = display.rotation();
 535   return true;
 536 }
 537
 538 scoped_ptr<SyntheticGestureTarget>
 539 RenderWidgetHostViewBase::CreateSyntheticGestureTarget() {
 540   RenderWidgetHostImpl* host =
 541       RenderWidgetHostImpl::From(GetRenderWidgetHost());
 542   return scoped_ptr<SyntheticGestureTarget>(
 543       new SyntheticGestureTargetBase(host));
 544 }
 545
 546 // Platform implementation should override this method to allow frame
 547 // subscription. Frame subscriber is set to RenderProcessHost, which is
 548 // platform independent. It should be set to the specific presenter on each
 549 // platform.
 550 bool RenderWidgetHostViewBase::CanSubscribeFrame() const {
 551   NOTIMPLEMENTED();
 552   return false;
 553 }
 554
 555 // Base implementation for this method sets the subscriber to RenderProcessHost,
 556 // which is platform independent. Note: Implementation only support subscribing
 557 // to accelerated composited frames.
 558 void RenderWidgetHostViewBase::BeginFrameSubscription(
 559     scoped_ptr<RenderWidgetHostViewFrameSubscriber> subscriber) {
 560   RenderWidgetHostImpl* impl = NULL;
 561   if (GetRenderWidgetHost())
 562     impl = RenderWidgetHostImpl::From(GetRenderWidgetHost());
 563   if (!impl)
 564     return;
 565   RenderProcessHostImpl* render_process_host =
 566       static_cast<RenderProcessHostImpl*>(impl->GetProcess());
 567   render_process_host->BeginFrameSubscription(impl->GetRoutingID(),
 568                                               subscriber.Pass());
 569 }
 570
 571 void RenderWidgetHostViewBase::EndFrameSubscription() {
 572   RenderWidgetHostImpl* impl = NULL;
 573   if (GetRenderWidgetHost())
 574     impl = RenderWidgetHostImpl::From(GetRenderWidgetHost());
 575   if (!impl)
 576     return;
 577   RenderProcessHostImpl* render_process_host =
 578       static_cast<RenderProcessHostImpl*>(impl->GetProcess());
 579   render_process_host->EndFrameSubscription(impl->GetRoutingID());
 580 }
 581
 582 uint32 RenderWidgetHostViewBase::RendererFrameNumber() {
 583   return renderer_frame_number_;
 584 }
 585
 586 void RenderWidgetHostViewBase::DidReceiveRendererFrame() {
 587   ++renderer_frame_number_;
 588 }
 589
 590 void RenderWidgetHostViewBase::FlushInput() {
 591   RenderWidgetHostImpl* impl = NULL;
 592   if (GetRenderWidgetHost())
 593     impl = RenderWidgetHostImpl::From(GetRenderWidgetHost());
 594   if (!impl)
 595     return;
 596   impl->FlushInput();
 597 }
 598
 599 SkColorType RenderWidgetHostViewBase::PreferredReadbackFormat() {
 600   return kN32_SkColorType;
 601 }
 602
 603 gfx::Size RenderWidgetHostViewBase::GetVisibleViewportSize() const {
 604   return GetViewBounds().size();
 605 }
 606
 607 void RenderWidgetHostViewBase::SetInsets(const gfx::Insets& insets) {
 608   NOTIMPLEMENTED();
 609 }
 610
 611 // static
 612 blink::WebScreenOrientationType
 613 RenderWidgetHostViewBase::GetOrientationTypeForMobile(
 614     const gfx::Display& display) {
 615   int angle = display.RotationAsDegree();
 616   const gfx::Rect& bounds = display.bounds();
 617
 618   // Whether the device's natural orientation is portrait.
 619   bool natural_portrait = false;
 620   if (angle == 0 || angle == 180) // The device is in its natural orientation.
 621     natural_portrait = bounds.height() >= bounds.width();
 622   else
 623     natural_portrait = bounds.height() <= bounds.width();
 624
 625   switch (angle) {
 626   case 0:
 627     return natural_portrait ? blink::WebScreenOrientationPortraitPrimary
 628                            : blink::WebScreenOrientationLandscapePrimary;
 629   case 90:
 630     return natural_portrait ? blink::WebScreenOrientationLandscapePrimary
 631                            : blink::WebScreenOrientationPortraitSecondary;
 632   case 180:
 633     return natural_portrait ? blink::WebScreenOrientationPortraitSecondary
 634                            : blink::WebScreenOrientationLandscapeSecondary;
 635   case 270:
 636     return natural_portrait ? blink::WebScreenOrientationLandscapeSecondary
 637                            : blink::WebScreenOrientationPortraitPrimary;
 638   default:
 639     NOTREACHED();
 640     return blink::WebScreenOrientationPortraitPrimary;
 641   }
 642 }
 643
 644 // static
 645 blink::WebScreenOrientationType
 646 RenderWidgetHostViewBase::GetOrientationTypeForDesktop(
 647     const gfx::Display& display) {
 648   static int primary_landscape_angle = -1;
 649   static int primary_portrait_angle = -1;
 650
 651   int angle = display.RotationAsDegree();
 652   const gfx::Rect& bounds = display.bounds();
 653   bool is_portrait = bounds.height() >= bounds.width();
 654
 655   if (is_portrait && primary_portrait_angle == -1)
 656     primary_portrait_angle = angle;
 657
 658   if (!is_portrait && primary_landscape_angle == -1)
 659     primary_landscape_angle = angle;
 660
 661   if (is_portrait) {
 662     return primary_portrait_angle == angle
 663         ? blink::WebScreenOrientationPortraitPrimary
 664         : blink::WebScreenOrientationPortraitSecondary;
 665   }
 666
 667   return primary_landscape_angle == angle
 668       ? blink::WebScreenOrientationLandscapePrimary
 669       : blink::WebScreenOrientationLandscapeSecondary;
 670 }
 671
 672 }  // namespace content