Combine ViewHostMsg_{Paint,Scroll}Rect into one IPC....

chrome/renderer/render_widget.cc

 // Copyright (c) 2009 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 "chrome/renderer/render_widget.h"
 
 #include "base/command_line.h"
 #include "base/gfx/point.h"
 #include "base/gfx/size.h"
 #include "base/logging.h"
@@ skipping 32 matching lines @@
 using WebKit::WebSize;
 using WebKit::WebTextDirection;
 
 RenderWidget::RenderWidget(RenderThreadBase* render_thread, bool activatable)
     : routing_id_(MSG_ROUTING_NONE),
       webwidget_(NULL),
       opener_id_(MSG_ROUTING_NONE),
       render_thread_(render_thread),
       host_window_(0),
       current_paint_buf_(NULL),
-      current_scroll_buf_(NULL),
       next_paint_flags_(0),
-      paint_reply_pending_(false),
+      update_reply_pending_(false),
       did_show_(false),
       is_hidden_(false),
       needs_repainting_on_restore_(false),
       has_focus_(false),
       handling_input_event_(false),
       closing_(false),
       ime_is_active_(false),
       ime_control_enable_ime_(true),
       ime_control_x_(-1),
       ime_control_y_(-1),
       ime_control_new_state_(false),
       ime_control_updated_(false),
       ime_control_busy_(false),
       activatable_(activatable),
       pending_window_rect_count_(0),
       suppress_next_char_events_(false) {
   RenderProcess::current()->AddRefProcess();
   DCHECK(render_thread_);
 }
 
 RenderWidget::~RenderWidget() {
   DCHECK(!webwidget_) << "Leaking our WebWidget!";
   if (current_paint_buf_) {
     RenderProcess::current()->ReleaseTransportDIB(current_paint_buf_);
     current_paint_buf_ = NULL;
   }
-  if (current_scroll_buf_) {
-    RenderProcess::current()->ReleaseTransportDIB(current_scroll_buf_);
-    current_scroll_buf_ = NULL;
-  }
   RenderProcess::current()->ReleaseProcess();
 }
 
 /*static*/
 RenderWidget* RenderWidget::Create(int32 opener_id,
                                    RenderThreadBase* render_thread,
                                    bool activatable) {
   DCHECK(opener_id != MSG_ROUTING_NONE);
   scoped_refptr<RenderWidget> widget = new RenderWidget(render_thread,
                                                         activatable);
@@ skipping 39 matching lines @@
 
   Send(new ViewHostMsg_RenderViewReady(routing_id_));
 }
 
 IPC_DEFINE_MESSAGE_MAP(RenderWidget)
   IPC_MESSAGE_HANDLER(ViewMsg_Close, OnClose)
   IPC_MESSAGE_HANDLER(ViewMsg_CreatingNew_ACK, OnCreatingNewAck)
   IPC_MESSAGE_HANDLER(ViewMsg_Resize, OnResize)
   IPC_MESSAGE_HANDLER(ViewMsg_WasHidden, OnWasHidden)
   IPC_MESSAGE_HANDLER(ViewMsg_WasRestored, OnWasRestored)
-  IPC_MESSAGE_HANDLER(ViewMsg_PaintRect_ACK, OnPaintRectAck)
-  IPC_MESSAGE_HANDLER(ViewMsg_ScrollRect_ACK, OnScrollRectAck)
+  IPC_MESSAGE_HANDLER(ViewMsg_UpdateRect_ACK, OnUpdateRectAck)
   IPC_MESSAGE_HANDLER(ViewMsg_HandleInputEvent, OnHandleInputEvent)
   IPC_MESSAGE_HANDLER(ViewMsg_MouseCaptureLost, OnMouseCaptureLost)
   IPC_MESSAGE_HANDLER(ViewMsg_SetFocus, OnSetFocus)
   IPC_MESSAGE_HANDLER(ViewMsg_ImeSetInputMode, OnImeSetInputMode)
   IPC_MESSAGE_HANDLER(ViewMsg_ImeSetComposition, OnImeSetComposition)
   IPC_MESSAGE_HANDLER(ViewMsg_Repaint, OnMsgRepaint)
   IPC_MESSAGE_HANDLER(ViewMsg_SetTextDirection, OnSetTextDirection)
   IPC_MESSAGE_HANDLER(ViewMsg_Move_ACK, OnRequestMoveAck)
   IPC_MESSAGE_UNHANDLED_ERROR()
 IPC_END_MESSAGE_MAP()
@@ skipping 94 matching lines @@
   needs_repainting_on_restore_ = false;
 
   // Tag the next paint as a restore ack, which is picked up by DoDeferredUpdate
   // when it sends out the next PaintRect message.
   set_next_paint_is_restore_ack();
 
   // Generate a full repaint.
   didInvalidateRect(gfx::Rect(size_.width(), size_.height()));
 }
 
-void RenderWidget::OnPaintRectAck() {
-  DCHECK(paint_reply_pending());
-  paint_reply_pending_ = false;
-  // If we sent a PaintRect message with a zero-sized bitmap, then
-  // we should have no current paint buf.
+void RenderWidget::OnRequestMoveAck() {
+  DCHECK(pending_window_rect_count_);
+  pending_window_rect_count_--;
+}
+
+void RenderWidget::OnUpdateRectAck() {
+  DCHECK(update_reply_pending());
+  update_reply_pending_ = false;
+
+  // If we sent an UpdateRect message with a zero-sized bitmap, then we should
+  // have no current update buf.
   if (current_paint_buf_) {
     RenderProcess::current()->ReleaseTransportDIB(current_paint_buf_);
     current_paint_buf_ = NULL;
   }
 
   // Notify subclasses
   DidPaint();
 
   // Continue painting if necessary...
   CallDoDeferredUpdate();
 }
 
-void RenderWidget::OnRequestMoveAck() {
-  DCHECK(pending_window_rect_count_);
-  pending_window_rect_count_--;
-}
-
-void RenderWidget::OnScrollRectAck() {
-  DCHECK(scroll_reply_pending());
-
-  if (current_scroll_buf_) {
-    RenderProcess::current()->ReleaseTransportDIB(current_scroll_buf_);
-    current_scroll_buf_ = NULL;
-  }
-
-  // Continue scrolling if necessary...
-  CallDoDeferredUpdate();
-}
-
 void RenderWidget::OnHandleInputEvent(const IPC::Message& message) {
   void* iter = NULL;
 
   const char* data;
   int data_length;
   handling_input_event_ = true;
   if (!message.ReadData(&iter, &data, &data_length)) {
     handling_input_event_ = false;
     return;
   }
@@ skipping 93 matching lines @@
   canvas->restore();
 }
 
 void RenderWidget::PaintDebugBorder(const gfx::Rect& rect,
                                     skia::PlatformCanvas* canvas) {
   static bool kPaintBorder =
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kShowPaintRects);
   if (!kPaintBorder)
     return;
 
+  // Cycle through these colors to help distinguish new paint rects.
+  const SkColor colors[] = {
+    SkColorSetARGB(0x3F, 0xFF, 0, 0),
+    SkColorSetARGB(0x3F, 0xFF, 0, 0xFF),
+    SkColorSetARGB(0x3F, 0, 0, 0xFF),
+  };
+  static int color_selector = 0;
+
   SkPaint paint;
   paint.setStyle(SkPaint::kStroke_Style);
-  paint.setColor(SkColorSetARGB(0x3F, 0xFF, 0, 0));
+  paint.setColor(colors[color_selector++ % arraysize(colors)]);
   paint.setStrokeWidth(1);
 
   SkIRect irect;
   irect.set(rect.x(), rect.y(), rect.right() - 1, rect.bottom() - 1);
   canvas->drawIRect(irect, paint);
 }
 
 void RenderWidget::CallDoDeferredUpdate() {
   DoDeferredUpdate();
 
   if (pending_input_event_ack_.get()) {
     Send(pending_input_event_ack_.get());
     pending_input_event_ack_.release();
   }
 }
 
 void RenderWidget::DoDeferredUpdate() {
   if (!webwidget_ || !paint_aggregator_.HasPendingUpdate() ||
-      paint_reply_pending() || scroll_reply_pending())
+      update_reply_pending())
     return;
 
   // Suppress updating when we are hidden.
   if (is_hidden_ || size_.IsEmpty()) {
     paint_aggregator_.ClearPendingUpdate();
     needs_repainting_on_restore_ = true;
     return;
   }
 
   // Layout may generate more invalidation.
   webwidget_->layout();
 
   // OK, save the pending update to a local since painting may cause more
   // invalidation.  Some WebCore rendering objects only layout when painted.
   PaintAggregator::PendingUpdate update = paint_aggregator_.GetPendingUpdate();
   paint_aggregator_.ClearPendingUpdate();
 
-  if (!update.scroll_rect.IsEmpty()) {
-    // Optmized scrolling
+  gfx::Rect scroll_damage = update.GetScrollDamage();
+  gfx::Rect bounds = update.GetPaintBounds().Union(scroll_damage);
 
-    // Compute the region we will expose by scrolling, and paint that into a
-    // shared memory section.
-    gfx::Rect damaged_rect = update.GetScrollDamage();
-
-    scoped_ptr<skia::PlatformCanvas> canvas(
-        RenderProcess::current()->GetDrawingCanvas(&current_scroll_buf_,
-                                                   damaged_rect));
-    if (!canvas.get()) {
-      NOTREACHED();
-      return;
-    }
-
-    // We may get back a smaller canvas than we asked for.
-    damaged_rect.set_width(canvas->getDevice()->width());
-    damaged_rect.set_height(canvas->getDevice()->height());
-
-    // Set these parameters before calling Paint, since that could result in
-    // further invalidates (uncommon).
-    ViewHostMsg_ScrollRect_Params params;
-    params.bitmap_rect = damaged_rect;
-    params.dx = update.scroll_delta.x();
-    params.dy = update.scroll_delta.y();
-    params.clip_rect = update.scroll_rect;
-    params.view_size = size_;
-    params.plugin_window_moves = plugin_window_moves_;
-    params.bitmap = current_scroll_buf_->id();
-
-    plugin_window_moves_.clear();
-
-    PaintRect(damaged_rect, damaged_rect.origin(), canvas.get());
-    Send(new ViewHostMsg_ScrollRect(routing_id_, params));
+  // Compute a buffer for painting and cache it.
+  scoped_ptr<skia::PlatformCanvas> canvas(
+      RenderProcess::current()->GetDrawingCanvas(&current_paint_buf_, bounds));
+  if (!canvas.get()) {
+    NOTREACHED();
+    return;
   }
 
-  if (!update.paint_rects.empty()) {
-    // Normal painting
+  // We may get back a smaller canvas than we asked for.
+  // TODO(darin): This seems like it could cause painting problems!
+  DCHECK_EQ(bounds.width(), canvas->getDevice()->width());
+  DCHECK_EQ(bounds.height(), canvas->getDevice()->height());
+  bounds.set_width(canvas->getDevice()->width());
+  bounds.set_height(canvas->getDevice()->height());
 
-    gfx::Rect bounds = update.GetPaintBounds();
+  HISTOGRAM_COUNTS_100("MPArch.RW_PaintRectCount", update.paint_rects.size());
 
-    // Compute a buffer for painting and cache it.
-    scoped_ptr<skia::PlatformCanvas> canvas(
-        RenderProcess::current()->GetDrawingCanvas(&current_paint_buf_,
-                                                   bounds));
-    if (!canvas.get()) {
-      NOTREACHED();
-      return;
-    }
+  // The scroll damage is just another rectangle to paint and copy.
+  std::vector<gfx::Rect> copy_rects;
+  copy_rects.swap(update.paint_rects);
+  if (!scroll_damage.IsEmpty())
+    copy_rects.push_back(scroll_damage);
 
-    // We may get back a smaller canvas than we asked for.
-    bounds.set_width(canvas->getDevice()->width());
-    bounds.set_height(canvas->getDevice()->height());
+  // TODO(darin): Re-enable painting multiple damage rects once the
+  // page-cycler regressions are resolved.  See bug 29589.
+  if (update.scroll_rect.IsEmpty()) {
+    update.paint_rects.clear();
+    update.paint_rects.push_back(bounds);
+  }
 
-    HISTOGRAM_COUNTS_100("MPArch.RW_PaintRectCount", update.paint_rects.size());
+  for (size_t i = 0; i < copy_rects.size(); ++i)
+    PaintRect(copy_rects[i], bounds.origin(), canvas.get());
 
-    // TODO(darin): Re-enable painting multiple damage rects once the
-    // page-cycler regressions are resolved.  See bug 29589.
-    if (update.scroll_rect.IsEmpty()) {
-      update.paint_rects.clear();
-      update.paint_rects.push_back(bounds);
-    }
+  ViewHostMsg_UpdateRect_Params params;
+  params.bitmap = current_paint_buf_->id();
+  params.bitmap_rect = bounds;
+  params.dx = update.scroll_delta.x();
+  params.dy = update.scroll_delta.y();
+  params.scroll_rect = update.scroll_rect;
+  params.copy_rects.swap(copy_rects);  // TODO(darin): clip to bounds?
+  params.view_size = size_;
+  params.plugin_window_moves.swap(plugin_window_moves_);
+  params.flags = next_paint_flags_;
 
-    for (size_t i = 0; i < update.paint_rects.size(); ++i)
-      PaintRect(update.paint_rects[i], bounds.origin(), canvas.get());
-
-    ViewHostMsg_PaintRect_Params params;
-    params.bitmap_rect = bounds;
-    params.update_rects = update.paint_rects;  // TODO(darin): clip to bounds?
-    params.view_size = size_;
-    params.plugin_window_moves = plugin_window_moves_;
-    params.flags = next_paint_flags_;
-    params.bitmap = current_paint_buf_->id();
-
-    plugin_window_moves_.clear();
-
-    paint_reply_pending_ = true;
-    Send(new ViewHostMsg_PaintRect(routing_id_, params));
-    next_paint_flags_ = 0;
-  }
+  update_reply_pending_ = true;
+  Send(new ViewHostMsg_UpdateRect(routing_id_, params));
+  next_paint_flags_ = 0;
 
   UpdateIME();
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // WebWidgetDelegate
 
 void RenderWidget::didInvalidateRect(const WebRect& rect) {
   // We only want one pending DoDeferredUpdate call at any time...
   bool update_pending = paint_aggregator_.HasPendingUpdate();
 
   // The invalidated rect might be outside the bounds of the view.
   gfx::Rect view_rect(0, 0, size_.width(), size_.height());
   gfx::Rect damaged_rect = view_rect.Intersect(rect);
   if (damaged_rect.IsEmpty())
     return;
 
   paint_aggregator_.InvalidateRect(damaged_rect);
 
   // We may not need to schedule another call to DoDeferredUpdate.
   if (update_pending)
     return;
   if (!paint_aggregator_.HasPendingUpdate())
     return;
-  if (paint_reply_pending() || scroll_reply_pending())
+  if (update_reply_pending())
     return;
 
   // Perform updating asynchronously.  This serves two purposes:
   // 1) Ensures that we call WebView::Paint without a bunch of other junk
   //    on the call stack.
   // 2) Allows us to collect more damage rects before painting to help coalesce
   //    the work that we will need to do.
   MessageLoop::current()->PostTask(FROM_HERE, NewRunnableMethod(
       this, &RenderWidget::CallDoDeferredUpdate));
 }
 
 void RenderWidget::didScrollRect(int dx, int dy, const WebRect& clip_rect) {
   // We only want one pending DoDeferredUpdate call at any time...
   bool update_pending = paint_aggregator_.HasPendingUpdate();
 
   // The scrolled rect might be outside the bounds of the view.
   gfx::Rect view_rect(0, 0, size_.width(), size_.height());
   gfx::Rect damaged_rect = view_rect.Intersect(clip_rect);
   if (damaged_rect.IsEmpty())
     return;
 
   paint_aggregator_.ScrollRect(dx, dy, damaged_rect);
 
   // We may not need to schedule another call to DoDeferredUpdate.
   if (update_pending)
     return;
   if (!paint_aggregator_.HasPendingUpdate())
     return;
-  if (paint_reply_pending() || scroll_reply_pending())
+  if (update_reply_pending())
     return;
 
   // Perform updating asynchronously.  This serves two purposes:
   // 1) Ensures that we call WebView::Paint without a bunch of other junk
   //    on the call stack.
   // 2) Allows us to collect more damage rects before painting to help coalesce
   //    the work that we will need to do.
   MessageLoop::current()->PostTask(FROM_HERE, NewRunnableMethod(
       this, &RenderWidget::CallDoDeferredUpdate));
 }
@@ skipping 175 matching lines @@
     render_thread_->WidgetRestored();
 }
 
 void RenderWidget::SetBackground(const SkBitmap& background) {
   background_ = background;
   // Generate a full repaint.
   didInvalidateRect(gfx::Rect(size_.width(), size_.height()));
 }
 
 bool RenderWidget::next_paint_is_resize_ack() const {
-  return ViewHostMsg_PaintRect_Flags::is_resize_ack(next_paint_flags_);
+  return ViewHostMsg_UpdateRect_Flags::is_resize_ack(next_paint_flags_);
 }
 
 bool RenderWidget::next_paint_is_restore_ack() const {
-  return ViewHostMsg_PaintRect_Flags::is_restore_ack(next_paint_flags_);
+  return ViewHostMsg_UpdateRect_Flags::is_restore_ack(next_paint_flags_);
 }
 
 void RenderWidget::set_next_paint_is_resize_ack() {
-  next_paint_flags_ |= ViewHostMsg_PaintRect_Flags::IS_RESIZE_ACK;
+  next_paint_flags_ |= ViewHostMsg_UpdateRect_Flags::IS_RESIZE_ACK;
 }
 
 void RenderWidget::set_next_paint_is_restore_ack() {
-  next_paint_flags_ |= ViewHostMsg_PaintRect_Flags::IS_RESTORE_ACK;
+  next_paint_flags_ |= ViewHostMsg_UpdateRect_Flags::IS_RESTORE_ACK;
 }
 
 void RenderWidget::set_next_paint_is_repaint_ack() {
-  next_paint_flags_ |= ViewHostMsg_PaintRect_Flags::IS_REPAINT_ACK;
+  next_paint_flags_ |= ViewHostMsg_UpdateRect_Flags::IS_REPAINT_ACK;
 }
 
 void RenderWidget::UpdateIME() {
   // If a browser process does not have IMEs, its IMEs are not active, or there
   // are not any attached widgets.
   // a renderer process does not have to retrieve information of the focused
   // control or send notification messages to a browser process.
   if (!ime_is_active_) {
     return;
   }
@@ skipping 86 matching lines @@
 
 void RenderWidget::CleanupWindowInPluginMoves(gfx::PluginWindowHandle window) {
   for (WebPluginGeometryVector::iterator i = plugin_window_moves_.begin();
        i != plugin_window_moves_.end(); ++i) {
     if (i->window == window) {
       plugin_window_moves_.erase(i);
       break;
     }
   }
 }