Don't cache size of cursor rings array

 Bug: 4974452
 Remove the unnecessary assert
 Prevent size of cursor rings array from getting out of sync
 with the cached size by eliminating the cached size

Change-Id: I40ceb22f3b636e5af890607b456e76e38c615eac

3 files changed, 8 insertions, 13 deletions

diff --git a/Source/WebKit/android/nav/CacheBuilder.cpp b/Source/WebKit/android/nav/CacheBuilder.cpp
index a4bc758..623d2cb 100644
--- a/Source/WebKit/android/nav/CacheBuilder.cpp
+++ b/Source/WebKit/android/nav/CacheBuilder.cpp
@@ -1406,7 +1406,6 @@ void CacheBuilder::BuildFrame(Frame* root, Frame* frame,
             else if (cachedNode.clip(clip) == false)
                 continue; // skip this node if outside of the clip
         }
-        cachedNode.setNavableRects();
         cachedNode.setColorIndex(colorIndex);
         cachedNode.setExport(exported);
         cachedNode.setHasCursorRing(hasCursorRing);
@@ -1478,7 +1477,6 @@ bool CacheBuilder::CleanUpContainedNodes(CachedRoot* cachedRoot,
             lastNode->hasTagName(HTMLNames::formTag)) {
         lastCached->setBounds(IntRect(0, 0, 0, 0));
         lastCached->mCursorRing.clear();
-        lastCached->setNavableRects();
         return false;
     }
     CachedNode* onlyChildCached = cachedFrame->lastNode();
diff --git a/Source/WebKit/android/nav/CachedNode.cpp b/Source/WebKit/android/nav/CachedNode.cpp
index 86c2a38..e500875 100644
--- a/Source/WebKit/android/nav/CachedNode.cpp
+++ b/Source/WebKit/android/nav/CachedNode.cpp
@@ -92,10 +92,9 @@ void CachedNode::cursorRings(const CachedFrame* frame,
 
 WebCore::IntRect CachedNode::cursorRingBounds(const CachedFrame* frame) const
 {
-    int partMax = mNavableRects;
-    ASSERT(partMax > 0);
-    WebCore::IntRect bounds = mCursorRing[0];
-    for (int partIndex = 1; partIndex < partMax; partIndex++)
+    int partMax = navableRects();
+    WebCore::IntRect bounds;
+    for (int partIndex = 0; partIndex < partMax; partIndex++)
         bounds.unite(mCursorRing[partIndex]);
     bounds.inflate(CURSOR_RING_HIT_TEST_RADIUS);
     return mIsInLayer ? frame->adjustBounds(this, bounds) : bounds;
@@ -116,7 +115,7 @@ void CachedNode::fixUpCursorRects(const CachedFrame* frame)
         mUseHitBounds = true;
         return;
     }
-    if (mNavableRects <= 1)
+    if (navableRects() <= 1)
         return;
     // if there is more than 1 rect, and the bounds doesn't intersect
     // any other cursor ring bounds, use it
@@ -290,8 +289,8 @@ void CachedNode::move(int x, int y)
 bool CachedNode::partRectsContains(const CachedNode* other) const
 {    
     int outerIndex = 0;
-    int outerMax = mNavableRects;
-    int innerMax = other->mNavableRects;
+    int outerMax = navableRects();
+    int innerMax = other->navableRects();
     do {
         const WebCore::IntRect& outerBounds = mCursorRing[outerIndex];
         int innerIndex = 0;
@@ -403,7 +402,7 @@ void CachedNode::Debug::print() const
     DUMP_NAV_LOGD("// void* mParentGroup=%p; // (%d) \n", b->mParentGroup, mParentGroupIndex);
     DUMP_NAV_LOGD("// int mDataIndex=%d;\n", b->mDataIndex);
     DUMP_NAV_LOGD("// int mIndex=%d;\n", b->mIndex);
-    DUMP_NAV_LOGD("// int mNavableRects=%d;\n", b->mNavableRects);
+    DUMP_NAV_LOGD("// int navableRects()=%d;\n", b->navableRects());
     DUMP_NAV_LOGD("// int mParentIndex=%d;\n", b->mParentIndex);
     DUMP_NAV_LOGD("// int mTabIndex=%d;\n", b->mTabIndex);
     DUMP_NAV_LOGD("// int mColorIndex=%d;\n", b->mColorIndex);
diff --git a/Source/WebKit/android/nav/CachedNode.h b/Source/WebKit/android/nav/CachedNode.h
index 602dda6..321b7fd 100644
--- a/Source/WebKit/android/nav/CachedNode.h
+++ b/Source/WebKit/android/nav/CachedNode.h
@@ -136,7 +136,7 @@ public:
     WebCore::IntRect localHitBounds(const CachedFrame* ) const;
     WebCore::IntRect localRing(const CachedFrame* , size_t part) const;
     void move(int x, int y);
-    int navableRects() const { return mNavableRects; }
+    int navableRects() const { return mCursorRing.size(); }
     void* nodePointer() const { return mNode; }
     bool noSecondChance() const { return mCondition > SECOND_CHANCE_END; }
     const WebCore::IntRect& originalAbsoluteBounds() const {
@@ -169,7 +169,6 @@ public:
     void setIsTransparent(bool isTransparent) { mIsTransparent = isTransparent; }
     void setIsUnclipped(bool unclipped) { mIsUnclipped = unclipped; }
     void setLast() { mLast = true; }
-    void setNavableRects() { mNavableRects = mCursorRing.size(); }
     void setParentGroup(void* group) { mParentGroup = group; }
     void setParentIndex(int parent) { mParentIndex = parent; }
     void setSingleImage(bool single) { mSingleImage = single; }
@@ -195,7 +194,6 @@ private:
     void* mParentGroup; // WebCore::Node*, only used to match pointers
     int mDataIndex; // child frame if a frame; input data index; or -1
     int mIndex; // index of itself, to find first in array (document)
-    int mNavableRects; // FIXME: could be bitfield once I limit max number of rects
     int mParentIndex;
     int mTabIndex;
     int mColorIndex; // index to ring color and other stylable properties