Attempt to scroll layers everytime the user drags.

This is part of a frameworks/base change.

Use the composite root bounds for the inval region when updating the UI picture.
This fixes several drawing issues with outdated pictures.

Bug: 3022562

Change-Id: Ic28cfbbe381fdd59368a6d83bb73b01df912b530

2 files changed, 20 insertions, 33 deletions

diff --git a/WebKit/android/nav/CacheBuilder.cpp b/WebKit/android/nav/CacheBuilder.cpp
index f0333f2..cbc580d 100644
--- a/WebKit/android/nav/CacheBuilder.cpp
+++ b/WebKit/android/nav/CacheBuilder.cpp
@@ -1177,10 +1177,6 @@ void CacheBuilder::BuildFrame(Frame* root, Frame* frame,
         originalAbsBounds = absBounds;
         absBounds.move(globalOffsetX, globalOffsetY);
         hasClip = nodeRenderer->hasOverflowClip();
-#if ENABLE(ANDROID_OVERFLOW_SCROLL)
-        if (nodeRenderer->enclosingLayer() && nodeRenderer->enclosingLayer()->hasOverflowParent())
-            hasClip = false;
-#endif
 
         if (node->hasTagName(HTMLNames::canvasTag))
             mPictureSetDisabled = true;
@@ -1392,12 +1388,6 @@ void CacheBuilder::BuildFrame(Frame* root, Frame* frame,
                 clip.intersect(parentClip);
             hasClip = true;
         }
-        if (hasClip) {
-            if (clip.isEmpty())
-                continue; // skip this node if clip prevents all drawing
-            else if (cachedNode.clip(clip) == false)
-                continue; // skip this node if outside of the clip
-        }
         bool isInLayer = false;
 #if USE(ACCELERATED_COMPOSITING)
         // If this renderer has a composited parent layer (including itself),
@@ -1414,11 +1404,18 @@ void CacheBuilder::BuildFrame(Frame* root, Frame* frame,
                 }
                 isInLayer = true;
                 isUnclipped = true; // assume that layers do not have occluded nodes
+                hasClip = false;
                 AddLayer(cachedFrame, cachedFrame->size(), layerClip.location(),
                          layer->uniqueId());
             }
         }
 #endif
+        if (hasClip) {
+            if (clip.isEmpty())
+                continue; // skip this node if clip prevents all drawing
+            else if (cachedNode.clip(clip) == false)
+                continue; // skip this node if outside of the clip
+        }
         cachedNode.setNavableRects();
         cachedNode.setColorIndex(colorIndex);
         cachedNode.setExport(exported);
@@ -2935,7 +2932,7 @@ void CacheBuilder::TrackLayer(WTF::Vector<LayerTracker>& layerTracker,
     IntPoint scroll(layer->scrollXOffset(), layer->scrollYOffset());
 #if ENABLE(ANDROID_OVERFLOW_SCROLL)
     // If this is an overflow element, track the content layer.
-    if (layer->hasOverflowParent() && aLayer->getChild(0))
+    if (layer->hasOverflowScroll())
         aLayer = aLayer->getChild(0)->getChild(0);
     if (!aLayer)
         return;
@@ -2945,7 +2942,7 @@ void CacheBuilder::TrackLayer(WTF::Vector<LayerTracker>& layerTracker,
     LayerTracker& indexTracker = layerTracker.last();
     indexTracker.mLayer = aLayer;
     indexTracker.mRenderLayer = layer;
-    indexTracker.mBounds = IntRect(FloatRect(aLayer->bounds()));
+    indexTracker.mBounds = enclosingIntRect(aLayer->bounds());
     // Use the absolute location of the layer as the bounds location.  This
     // provides the original offset of nodes in the layer so that we can
     // translate nodes between their original location and the layer's new
@@ -3094,7 +3091,7 @@ bool CacheBuilder::ConstructPartRects(Node* node, const IntRect& bounds,
                     return false;
                 continue;
             } 
-            if (renderer->hasOverflowClip() == false) {
+            if (hasClip == false) {
                 if (nodeIsAnchor && test->hasTagName(HTMLNames::divTag)) {
                     IntRect bounds = renderer->absoluteBoundingBoxRect();  // x, y fixup done by AddPartRect
                     int left = bounds.x() + ((RenderBox*)renderer)->paddingLeft() 
diff --git a/WebKit/android/nav/WebView.cpp b/WebKit/android/nav/WebView.cpp
index 4d92ce8..09a5c74 100644
--- a/WebKit/android/nav/WebView.cpp
+++ b/WebKit/android/nav/WebView.cpp
@@ -995,14 +995,15 @@ static const LayerAndroid* findScrollableLayer(const LayerAndroid* parent, int x
 }
 #endif
 
-const LayerAndroid* scrollableLayer(int x, int y)
+int scrollableLayer(int x, int y)
 {
 #if USE(ACCELERATED_COMPOSITING)
     const LayerAndroid* layerRoot = compositeRoot();
     if (!layerRoot)
         return 0;
     const LayerAndroid* result = findScrollableLayer(layerRoot, x, y);
-    return result;
+    if (result)
+        return result->uniqueId();
 #endif
     return 0;
 }
@@ -2213,31 +2214,20 @@ static int nativeScrollableLayer(JNIEnv* env, jobject jwebview, jint x, jint y)
 {
     WebView* view = GET_NATIVE_VIEW(env, jwebview);
     LOG_ASSERT(view, "view not set in %s", __FUNCTION__);
-    return (int) view->scrollableLayer(x, y);
+    return view->scrollableLayer(x, y);
 }
 
-static bool validLayer(const LayerAndroid* root, const LayerAndroid* layer) {
-    if (root == layer)
-        return true;
-    for (int i = 0; i < root->countChildren(); i++) {
-        const LayerAndroid* l = root->getChild(i);
-        if (validLayer(l, layer))
-            return true;
-    }
-    return false;
-}
-
-static bool nativeScrollLayer(JNIEnv* env, jobject obj, jint pLayer, jint dx,
+static bool nativeScrollLayer(JNIEnv* env, jobject obj, jint layerId, jint dx,
         jint dy)
 {
 #if ENABLE(ANDROID_OVERFLOW_SCROLL)
     WebView* view = GET_NATIVE_VIEW(env, obj);
-    const LayerAndroid* root = view->compositeRoot();
-    LayerAndroid* layer = (LayerAndroid*) pLayer;
-    if (!validLayer(root, layer)) {
+    LayerAndroid* root = view->compositeRoot();
+    if (!root)
+        return false;
+    LayerAndroid* layer = root->findById(layerId);
+    if (!layer)
         return false;
-    }
-    LOG_ASSERT(layer, "layer not set in %s", __FUNCTION__);
     return layer->scrollBy(dx, dy);
 #endif
     return false;