1 files changed, 6 insertions, 7 deletions

diff --git a/Source/WebCore/rendering/RenderBox.cpp b/Source/WebCore/rendering/RenderBox.cpp
index faf9102e1..8d45f3ff8 100644
--- a/Source/WebCore/rendering/RenderBox.cpp
+++ b/Source/WebCore/rendering/RenderBox.cpp
@@ -1282,6 +1282,8 @@ void RenderBox::mapLocalToContainer(RenderBoxModelObject* repaintContainer, Tran
         *wasFixed = mode & IsFixed;
     
     LayoutSize containerOffset = offsetFromContainer(o, roundedLayoutPoint(transformState.mappedPoint()));
+    if (mode & SnapOffsetForTransforms)
+        containerOffset = roundedIntSize(containerOffset);
     
     bool preserve3D = mode & UseTransforms && (o->style()->preserves3D() || style()->preserves3D());
     if (mode & UseTransforms && shouldUseTransformFromContainer(o)) {
@@ -1508,7 +1510,7 @@ void RenderBox::computeRectForRepaint(RenderBoxModelObject* repaintContainer, La
             LayoutState* layoutState = v->layoutState();
 
             if (layer() && layer()->transform())
-                rect = layer()->transform()->mapRect(rect);
+                rect = layer()->transform()->mapRect(pixelSnappedIntRect(rect));
 
             if (styleToUse->position() == RelativePosition && layer())
                 rect.move(layer()->relativePositionOffset());
@@ -1547,7 +1549,7 @@ void RenderBox::computeRectForRepaint(RenderBoxModelObject* repaintContainer, La
     // in the parent's coordinate space that encloses us.
     if (layer() && layer()->transform()) {
         fixed = position == FixedPosition;
-        rect = layer()->transform()->mapRect(rect);
+        rect = layer()->transform()->mapRect(pixelSnappedIntRect(rect));
         topLeft = rect.location();
         topLeft.move(locationOffset());
     } else if (position == FixedPosition)
@@ -2144,10 +2146,7 @@ LayoutUnit RenderBox::computePercentageLogicalHeight(const Length& height)
         cb->computeLogicalHeight();
         result = cb->contentLogicalHeight();
         cb->setLogicalHeight(oldHeight);
-    } else if (cb->isRoot() && isOutOfFlowPositioned())
-        // Match the positioned objects behavior, which is that positioned objects will fill their viewport
-        // always.  Note we could only hit this case by recurring into computePercentageLogicalHeight on a positioned containing block.
-        result = cb->computeContentBoxLogicalHeight(cb->availableLogicalHeight());
+    }
 
     if (result != -1) {
         result = valueForLength(height, result);
@@ -2270,7 +2269,7 @@ LayoutUnit RenderBox::computeReplacedLogicalHeightUsing(SizeType sizeType, Lengt
                 }
             }
             availableHeight = computeContentBoxLogicalHeight(valueForLength(logicalHeight, availableHeight));
-            if (cb->style()->logicalHeight().isFixed())
+            if (cb->isBox() && cb->style()->logicalHeight().isFixed())
                 availableHeight = max<LayoutUnit>(0, availableHeight - toRenderBox(cb)->scrollbarLogicalHeight());
             return availableHeight;
         }