1 files changed, 55 insertions, 5 deletions

diff --git a/chrome/browser/views/tabs/tab_strip.cc b/chrome/browser/views/tabs/tab_strip.cc
index cac1e62..a71caf5 100644
--- a/chrome/browser/views/tabs/tab_strip.cc
+++ b/chrome/browser/views/tabs/tab_strip.cc
@@ -62,6 +62,12 @@ static const int kSuspendAnimationsTimeMs = 200;
 static const int kTabHOffset = -16;
 static const int kTabStripAnimationVSlop = 40;
 
+// Alpha value phantom tabs are rendered at.
+static const int kPhantomTabAlpha = 105;
+
+// Alpha value phantom tab icons are rendered at.
+static const int kPhantomTabIconAlpha = 160;
+
 // Size of the drop indicator.
 static int drop_indicator_width;
 static int drop_indicator_height;
@@ -886,17 +892,53 @@ TabStrip* TabStrip::AsTabStrip() {
 // TabStrip, views::View overrides:
 
 void TabStrip::PaintChildren(gfx::Canvas* canvas) {
-  // Paint the tabs in reverse order, so they stack to the left.
+  // Tabs are painted in reverse order, so they stack to the left.
+
+  // Phantom tabs appear behind all other tabs and are rendered first. To make
+  // them slightly transparent we render them to a different layer.
+  if (HasPhantomTabs()) {
+    SkRect bounds;
+    bounds.set(0, 0, SkIntToScalar(width()), SkIntToScalar(height()));
+    canvas->saveLayerAlpha(&bounds, kPhantomTabAlpha,
+                           SkCanvas::kARGB_ClipLayer_SaveFlag);
+    canvas->drawARGB(0, 255, 255, 255, SkXfermode::kClear_Mode);
+    for (int i = GetTabCount() - 1; i >= 0; --i) {
+      Tab* tab = GetTabAt(i);
+      if (tab->phantom())
+        tab->ProcessPaint(canvas);
+    }
+    canvas->restore();
+
+    canvas->saveLayerAlpha(&bounds, kPhantomTabIconAlpha,
+                           SkCanvas::kARGB_ClipLayer_SaveFlag);
+    canvas->drawARGB(0, 255, 255, 255, SkXfermode::kClear_Mode);
+    for (int i = GetTabCount() - 1; i >= 0; --i) {
+      Tab* tab = GetTabAt(i);
+      if (tab->phantom()) {
+        canvas->save();
+        canvas->ClipRectInt(tab->MirroredX(), tab->y(), tab->width(),
+                            tab->height());
+        canvas->TranslateInt(tab->MirroredX(), tab->y());
+        tab->PaintIcon(canvas);
+        canvas->restore();
+      }
+    }
+    canvas->restore();
+  }
+
   Tab* selected_tab = NULL;
+
   for (int i = GetTabCount() - 1; i >= 0; --i) {
     Tab* tab = GetTabAt(i);
     // We must ask the _Tab's_ model, not ourselves, because in some situations
     // the model will be different to this object, e.g. when a Tab is being
     // removed after its TabContents has been destroyed.
-    if (!tab->IsSelected()) {
-      tab->ProcessPaint(canvas);
-    } else {
-      selected_tab = tab;
+    if (!tab->phantom()) {
+      if (!tab->IsSelected()) {
+        tab->ProcessPaint(canvas);
+      } else {
+        selected_tab = tab;
+      }
     }
   }
 
@@ -2007,3 +2049,11 @@ void TabStrip::HandleGlobalMouseMoveEvent() {
     resize_layout_factory_.RevokeAll();
   }
 }
+
+bool TabStrip::HasPhantomTabs() const {
+  for (int i = 0; i < GetTabCount(); ++i) {
+    if (GetTabAt(i)->phantom())
+      return true;
+  }
+  return false;
+}