Enable fast/images with slimming paint

Source/core/paint/ViewDisplayList.cpp

 // Copyright 2014 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 "config.h"
 #include "core/paint/ViewDisplayList.h"
 
 #include "platform/NotImplemented.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
@@ skipping 96 matching lines @@
     }
 
     m_invalidated.clear();
     m_newPaints.clear();
     m_paintList.clear();
     m_paintList.swap(updatedList);
     m_paintListRenderers.clear();
     m_paintListRenderers.swap(updatedRenderers);
 }
 
+DisplayItem::Type DisplayItem::paintPhaseToClipType(PaintPhase paintPhase)

[chrishtr, 2014/11/25 00:29:58]

IT's weird that this is in ViewDisplayList.cpp.

+{
+    switch (paintPhase) {
+    case PaintPhaseChildBlockBackgrounds:
+        return DisplayItem::ClipBoxChildBlockBackgrounds;
+        break;
+    case PaintPhaseFloat:
+        return DisplayItem::ClipBoxFloat;
+        break;
+    case PaintPhaseForeground:
+        return DisplayItem::ClipBoxChildBlockBackgrounds;
+        break;
+    case PaintPhaseChildOutlines:
+        return DisplayItem::ClipBoxChildOutlines;
+        break;
+    case PaintPhaseSelection:
+        return DisplayItem::ClipBoxSelection;
+        break;
+    case PaintPhaseCollapsedTableBorders:
+        return DisplayItem::ClipBoxCollapsedTableBorders;
+        break;
+    case PaintPhaseTextClip:
+        return DisplayItem::ClipBoxTextClip;
+        break;
+    case PaintPhaseClippingMask:
+        return DisplayItem::ClipBoxClippingMask;
+        break;
+    case PaintPhaseChildBlockBackground:
+    case PaintPhaseOutline:
+    case PaintPhaseBlockBackground:
+    case PaintPhaseSelfOutline:
+    case PaintPhaseMask:
+        ASSERT_NOT_REACHED();
+    }
+    // This should never happen.
+    return ClipBoxForeground;
+}
+
 #ifndef NDEBUG
 WTF::String DisplayItem::typeAsDebugString(DisplayItem::Type type)
 {
     switch (type) {
     case DisplayItem::DrawingPaintPhaseBlockBackground: return "DrawingPaintPhaseBlockBackground";
     case DisplayItem::DrawingPaintPhaseChildBlockBackground: return "DrawingPaintPhaseChildBlockBackground";
     case DisplayItem::DrawingPaintPhaseChildBlockBackgrounds: return "DrawingPaintPhaseChildBlockBackgrounds";
     case DisplayItem::DrawingPaintPhaseFloat: return "DrawingPaintPhaseFloat";
     case DisplayItem::DrawingPaintPhaseForeground: return "DrawingPaintPhaseForeground";
     case DisplayItem::DrawingPaintPhaseOutline: return "DrawingPaintPhaseOutline";
@@ skipping 14 matching lines @@
     case DisplayItem::ClipLayerFragmentChildOutline: return "ClipLayerFragmentChildOutline";
     case DisplayItem::ClipLayerFragmentOutline: return "ClipLayerFragmentOutline";
     case DisplayItem::ClipLayerFragmentMask: return "ClipLayerFragmentMask";
     case DisplayItem::ClipLayerFragmentClippingMask: return "ClipLayerFragmentClippingMask";
     case DisplayItem::ClipLayerFragmentParent: return "ClipLayerFragmentParent";
     case DisplayItem::ClipLayerFragmentSelection: return "ClipLayerFragmentSelection";
     case DisplayItem::ClipLayerFragmentChildBlockBackgrounds: return "ClipLayerFragmentChildBlockBackgrounds";
     case DisplayItem::EndClip: return "EndClip";
     case DisplayItem::BeginFilter: return "BeginFilter";
     case DisplayItem::EndFilter: return "EndFilter";
+    case DisplayItem::TransparencyClip: return "TransparencyClip";
     case DisplayItem::BeginTransparency: return "BeginTransparency";
     case DisplayItem::EndTransparency: return "EndTransparency";
     case ClipBoxChildBlockBackgrounds: return "ClipBoxChildBlockBackgrounds";
     case ClipBoxFloat: return "ClipBoxFloat";
     case ClipBoxForeground: return "ClipBoxForeground";
     case ClipBoxChildOutlines: return "ClipBoxChildOutlines";
     case ClipBoxSelection: return "ClipBoxSelection";
     case ClipBoxCollapsedTableBorders: return "ClipBoxCollapsedTableBorders";
     case ClipBoxTextClip: return "ClipBoxTextClip";
     case ClipBoxClippingMask: return "ClipBoxClippingMask";
@@ skipping 30 matching lines @@
 }
 
 void ViewDisplayList::showDebugData() const
 {
     fprintf(stderr, "paint list: [%s]\n", paintListAsDebugString(m_paintList).utf8().data());
     fprintf(stderr, "new paints: [%s]\n", paintListAsDebugString(m_newPaints).utf8().data());
 }
 #endif
 
 } // namespace blink