Implement SetVisuallyDeemphasized in ChromeRenderViewObserver.

Implement SetVisuallyDeemphasized in ChromeRenderViewObserver
- Add a ChromeViewMsg_SetVisuallyDeemphasized and use it to toggle background dimming on web contents via ChromeRenderViewObserver;
- Derive WebViewColorOverlay from WebKit::WebPageOverlay and add to web view when need to dimming the background;
- Remove RWHV SetVisuallyDeemphasized since it's no longer used;

BUG=103386
TEST=Verify fix for 103386, dimming should show up even when accelerated compositing is on.


Review URL: http://codereview.chromium.org/8730001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112787 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 109 insertions, 0 deletions

diff --git a/chrome/renderer/chrome_render_view_observer.cc b/chrome/renderer/chrome_render_view_observer.cc
index d4451c5..d352fe5 100644
--- a/chrome/renderer/chrome_render_view_observer.cc
+++ b/chrome/renderer/chrome_render_view_observer.cc
@@ -27,6 +27,7 @@
 #include "chrome/renderer/prerender/prerender_helper.h"
 #include "chrome/renderer/safe_browsing/phishing_classifier_delegate.h"
 #include "chrome/renderer/translate_helper.h"
+#include "chrome/renderer/webview_color_overlay.h"
 #include "content/public/common/bindings_policy.h"
 #include "content/public/renderer/render_view.h"
 #include "content/public/renderer/content_renderer_client.h"
@@ -47,6 +48,7 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 #include "ui/gfx/color_utils.h"
 #include "ui/gfx/favicon_size.h"
+#include "ui/gfx/size.h"
 #include "ui/gfx/skbitmap_operations.h"
 #include "webkit/glue/image_decoder.h"
 #include "webkit/glue/image_resource_fetcher.h"
@@ -259,6 +261,8 @@ bool ChromeRenderViewObserver::OnMessageReceived(const IPC::Message& message) {
                         OnSetAllowRunningInsecureContent)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetClientSidePhishingDetection,
                         OnSetClientSidePhishingDetection)
+    IPC_MESSAGE_HANDLER(ChromeViewMsg_SetVisuallyDeemphasized,
+                        OnSetVisuallyDeemphasized)
 #if defined(OS_CHROMEOS)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_StartFrameSniffer, OnStartFrameSniffer)
 #endif
@@ -380,6 +384,21 @@ void ChromeRenderViewObserver::OnSetClientSidePhishingDetection(
 #endif
 }
 
+void ChromeRenderViewObserver::OnSetVisuallyDeemphasized(bool deemphasized) {
+  bool already_deemphasized = !!dimmed_color_overlay_.get();
+  if (already_deemphasized == deemphasized)
+    return;
+
+  if (deemphasized) {
+    // 70% opaque grey.
+    SkColor greyish = SkColorSetARGB(178, 0, 0, 0);
+    dimmed_color_overlay_.reset(
+        new WebViewColorOverlay(render_view(), greyish));
+  } else {
+    dimmed_color_overlay_.reset();
+  }
+}
+
 void ChromeRenderViewObserver::OnStartFrameSniffer(const string16& frame_name) {
   new FrameSniffer(render_view(), frame_name);
 }
diff --git a/chrome/renderer/chrome_render_view_observer.h b/chrome/renderer/chrome_render_view_observer.h
index 4f995b1..bbaa13e 100644
--- a/chrome/renderer/chrome_render_view_observer.h
+++ b/chrome/renderer/chrome_render_view_observer.h
@@ -25,10 +25,12 @@ class ExternalHostBindings;
 class SkBitmap;
 class TranslateHelper;
 struct ThumbnailScore;
+class WebViewColorOverlay;
 
 namespace WebKit {
 class WebView;
 }
+
 namespace safe_browsing {
 class PhishingClassifierDelegate;
 }
@@ -127,6 +129,7 @@ class ChromeRenderViewObserver : public content::RenderViewObserver,
   void OnSetAllowDisplayingInsecureContent(bool allow);
   void OnSetAllowRunningInsecureContent(bool allow);
   void OnSetClientSidePhishingDetection(bool enable_phishing_detection);
+  void OnSetVisuallyDeemphasized(bool deemphasized);
   void OnStartFrameSniffer(const string16& frame_name);
   void OnGetFPS();
   void OnAddStrictSecurityHost(const std::string& host);
@@ -220,6 +223,9 @@ class ChromeRenderViewObserver : public content::RenderViewObserver,
   // ImageResourceFetchers schedule via DownloadImage.
   ImageResourceFetcherList image_fetchers_;
 
+  // A color page overlay when visually de-emaphasized.
+  scoped_ptr<WebViewColorOverlay> dimmed_color_overlay_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeRenderViewObserver);
 };
 
diff --git a/chrome/renderer/webview_color_overlay.cc b/chrome/renderer/webview_color_overlay.cc
new file mode 100644
index 0000000..c300dfd
--- /dev/null
+++ b/chrome/renderer/webview_color_overlay.cc
@@ -0,0 +1,49 @@
+// Copyright (c) 2011 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/webview_color_overlay.h"
+
+#include "base/logging.h"
+#include "content/public/renderer/render_view.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkRect.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
+#include "ui/gfx/size.h"
+#include "ui/gfx/skia_util.h"
+
+#if WEBKIT_USING_CG
+#include "skia/ext/skia_utils_mac.h"
+#endif
+
+WebViewColorOverlay::WebViewColorOverlay(content::RenderView* render_view,
+                                         SkColor color)
+    : render_view_(render_view),
+      color_(color) {
+  render_view_->GetWebView()->addPageOverlay(this, 0);
+}
+
+WebViewColorOverlay::~WebViewColorOverlay() {
+  render_view_->GetWebView()->removePageOverlay(this);
+}
+
+void WebViewColorOverlay::paintPageOverlay(WebKit::WebCanvas* canvas) {
+  SkRect rect = gfx::RectToSkRect(gfx::Rect(render_view_->GetSize()));
+
+#if WEBKIT_USING_SKIA
+  SkPaint paint;
+  paint.setColor(color_);
+  paint.setStyle(SkPaint::kFill_Style);
+  canvas->drawRect(rect, paint);
+#elif WEBKIT_USING_CG
+  CGContextSaveGState(canvas);
+  CGColorRef color = gfx::SkColorToCGColorRef(color_);
+  CGContextSetFillColorWithColor(canvas, color);
+  CGColorRelease(color);
+  CGContextFillRect(canvas, gfx::SkRectToCGRect(rect));
+  CGContextRestoreGState(canvas);
+#else
+  NOTIMPLEMENTED();
+#endif
+}
diff --git a/chrome/renderer/webview_color_overlay.h b/chrome/renderer/webview_color_overlay.h
new file mode 100644
index 0000000..3592637
--- /dev/null
+++ b/chrome/renderer/webview_color_overlay.h
@@ -0,0 +1,35 @@
+// Copyright (c) 2011 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.
+
+#ifndef CHROME_RENDERER_WEBVIEW_COLOR_OVERLAY_H_
+#define CHROME_RENDERER_WEBVIEW_COLOR_OVERLAY_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPageOverlay.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebRect.h"
+
+namespace content {
+class RenderView;
+}
+
+// This class draws the given color on a PageOverlay of a WebView.
+class WebViewColorOverlay : public WebKit::WebPageOverlay {
+ public:
+  WebViewColorOverlay(content::RenderView* render_view, SkColor color);
+  virtual ~WebViewColorOverlay();
+
+ private:
+  // WebKit::WebPageOverlay implementation:
+  virtual void paintPageOverlay(WebKit::WebCanvas* canvas);
+
+  content::RenderView* render_view_;
+  SkColor color_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebViewColorOverlay);
+};
+
+#endif  // CHROME_RENDERER_WEBVIEW_COLOR_OVERLAY_H_