Bug 1098275 - Inlinize block-level boxes inside ruby. r=heycam

--HG--
extra : rebase_source : 70a969d3a6be4ea5dfe14777aa7c31189ade7211
extra : source : 30e0ea21cdfaa29f2c138f0b8975da984e8ac009

layout/base/RestyleManager.cpp

@@ -2904,6 +2904,13 @@ ElementRestyler::ComputeRestyleResultFromNewContext(nsIFrame* aSelf,
     return eRestyleResult_Continue;
   }
 
+  if (oldContext->IsDirectlyInsideRuby() !=
+        aNewContext->IsDirectlyInsideRuby()) {
+    LOG_RESTYLE_CONTINUE("NS_STYLE_IS_DIRECTLY_INSIDE_RUBY differes between old"
+                         " and new style contexts");
+    return eRestyleResult_Continue;
+  }
+
   return eRestyleResult_Stop;
 }
 

layout/style/nsStyleContext.cpp

@@ -507,8 +507,8 @@ nsStyleContext::ApplyStyleFixups(bool aSkipParentDisplayBasedStyleFixup)
   //   # The computed 'display' of a flex item is determined
   //   # by applying the table in CSS 2.1 Chapter 9.7.
   // ...which converts inline-level elements to their block-level equivalents.
-  // Any direct children of elements with Ruby display values which are
-  // block-level are converted to their inline-level equivalents.
+  // Any block-level element directly contained by elements with ruby display
+  // values are converted to their inline-level equivalents.
   if (!aSkipParentDisplayBasedStyleFixup && mParent) {
     // Skip display:contents ancestors to reach the potential container.
     // (If there are only display:contents ancestors between this node and
@@ -558,12 +558,17 @@ nsStyleContext::ApplyStyleFixups(bool aSkipParentDisplayBasedStyleFixup)
           mutable_display->mDisplay = displayVal;
         }
       }
-    } else if (containerDisp->IsRubyDisplayType()) {
+    }
+
+    // The display change should only occur for "in-flow" children
+    if (!disp->IsOutOfFlowStyle() &&
+        ((containerDisp->mDisplay == NS_STYLE_DISPLAY_INLINE &&
+          containerContext->IsDirectlyInsideRuby()) ||
+         containerDisp->IsRubyDisplayType())) {
+      mBits |= NS_STYLE_IS_DIRECTLY_INSIDE_RUBY;
       uint8_t displayVal = disp->mDisplay;
       nsRuleNode::EnsureInlineDisplay(displayVal);
-      // The display change should only occur for "in-flow" children
-      if (displayVal != disp->mDisplay && 
-          !disp->IsOutOfFlowStyle()) {
+      if (displayVal != disp->mDisplay) {
         nsStyleDisplay *mutable_display =
           static_cast<nsStyleDisplay*>(GetUniqueStyleData(eStyleStruct_Display));
         mutable_display->mDisplay = displayVal;

layout/style/nsStyleContext.h

@@ -130,6 +130,12 @@ public:
   bool HasTextDecorationLines() const
     { return !!(mBits & NS_STYLE_HAS_TEXT_DECORATION_LINES); }
 
+  // Whether this style context or any of its inline-level ancestors
+  // is directly contained by a ruby box? It is used to inlinize
+  // block-level descendants and suppress line breaks inside ruby.
+  bool IsDirectlyInsideRuby() const
+    { return !!(mBits & NS_STYLE_IS_DIRECTLY_INSIDE_RUBY); }
+
   // Does this style context represent the style for a pseudo-element or
   // inherit data from such a style context?  Whether this returns true
   // is equivalent to whether it or any of its ancestors returns

layout/style/nsStyleStruct.h

@@ -56,9 +56,10 @@ class imgIContainer;
 // See nsStyleContext::AssertStructsNotUsedElsewhere
 // (This bit is currently only used in #ifdef DEBUG code.)
 #define NS_STYLE_IS_GOING_AWAY             0x040000000
+// See nsStyleContext::IsDirectlyInsideRuby
+#define NS_STYLE_IS_DIRECTLY_INSIDE_RUBY   0x080000000
 // See nsStyleContext::GetPseudoEnum
-#define NS_STYLE_CONTEXT_TYPE_MASK         0xf80000000
-#define NS_STYLE_CONTEXT_TYPE_SHIFT        31
+#define NS_STYLE_CONTEXT_TYPE_SHIFT        32
 
 // Additional bits for nsRuleNode's mDependentBits:
 #define NS_RULE_NODE_GC_MARK                0x02000000