scroll into view considers layers

LayerAndroid.*
- Add a utility that takes the given rectangle and subtracts
  layers that overlay it.

FindCanvas.*
- Add function that returns if the current match is on the
  main page or in a layer.

WebView.cpp
- Add jni caller for WebView.java calcOurContentVisibleRect.
  Call it instead of getVisibleRect, which has the side effect
  of sending messages back to webkit.
- Remove jni caller for getViewMetrics, since it is redundant.
- Only call scrollRectOnScreen for non-layers.

companion fix in framework/base

http://b/2485168

2 files changed, 36 insertions, 0 deletions

diff --git a/WebCore/platform/graphics/android/LayerAndroid.cpp b/WebCore/platform/graphics/android/LayerAndroid.cpp
index c0851dd..b0c2629 100644
--- a/WebCore/platform/graphics/android/LayerAndroid.cpp
+++ b/WebCore/platform/graphics/android/LayerAndroid.cpp
@@ -349,6 +349,38 @@ bool LayerAndroid::prepareContext(bool force)
     return m_recordingPicture;
 }
 
+SkRect LayerAndroid::subtractLayers(const SkRect& visibleRect) const
+{
+    SkRect result;
+    if (m_recordingPicture) {
+        SkRect globalRect = bounds();
+        globalRect.offset(-getPosition()); // localToGlobal adds in position
+        SkMatrix globalMatrix;
+        localToGlobal(&globalMatrix);
+        globalMatrix.mapRect(&globalRect);
+        SkIRect roundedGlobal;
+        globalRect.round(&roundedGlobal);
+        SkIRect iVisibleRect;
+        visibleRect.round(&iVisibleRect);
+        SkRegion visRegion(iVisibleRect);
+        visRegion.op(roundedGlobal, SkRegion::kDifference_Op);
+        result.set(visRegion.getBounds());
+#if DEBUG_NAV_UI
+        SkDebugf("%s visibleRect=(%g,%g,r=%g,b=%g) globalRect=(%g,%g,r=%g,b=%g)"
+            "result=(%g,%g,r=%g,b=%g)", __FUNCTION__,
+            visibleRect.fLeft, visibleRect.fTop,
+            visibleRect.fRight, visibleRect.fBottom,
+            globalRect.fLeft, globalRect.fTop,
+            globalRect.fRight, globalRect.fBottom,
+            result.fLeft, result.fTop, result.fRight, result.fBottom);
+#endif
+    } else
+        result = visibleRect;
+    for (int i = 0; i < countChildren(); i++)
+        result = getChild(i)->subtractLayers(result);
+    return result;
+}
+
 // Debug tools : dump the layers tree in a file.
 // The format is simple:
 // properties have the form: key = value;
diff --git a/WebCore/platform/graphics/android/LayerAndroid.h b/WebCore/platform/graphics/android/LayerAndroid.h
index 3cd7e36..2554fb9 100644
--- a/WebCore/platform/graphics/android/LayerAndroid.h
+++ b/WebCore/platform/graphics/android/LayerAndroid.h
@@ -119,6 +119,10 @@ public:
 
     SkPicture* picture() const { return m_recordingPicture; }
 
+    // remove layers bounds from visible rectangle to show what can be
+    // scrolled into view; returns original minus layer bounds in global space.
+    SkRect subtractLayers(const SkRect& visibleRect) const;
+
     void dumpLayers(FILE*, int indentLevel) const;
     void dumpToLog() const;