Move all fast-path paint invalidation mapping into PaintInvalidationState

- Remove the optional const PaintInvalidationState* parameter from paint
  invalidation mapping methods and move fast-path mapping code into
  PaintInvalidationState.

- PaintLayer::computePaintInvalidationRect() is now
    PaintInvalidationState::computePaintInvalidationRectInBacking();
  PaintLayer::positionFromPaintInvalidationBacking() is now
    PaintInvalidationState::positionFromPaintInvalidationBacking();
  PaintLayer::mapRectToPaintInvalidationBacking() is now
    PaintInvalidationState::mapLocalRectToPaintInvalidationBacking().

- Change LayoutObject::clippedOverflowRectForPaintInvalidationBacking() to:
  * Non-SVG objects and LayoutSVGRoot:
    LayoutObject::localOverflowRectForPaintInvalidation() which doesn't
    map the rect to paint invalidation backing;
  * SVG objects except LayoutSVGRoot:
    Using existing paintInvalidationRectInLocalSVGCoordinates()

  PaintInvalidationState::computePaintInvalidationRectInBacking(),
  calls the above functions to get the local paint invalidation rect,
  and map to paintInvalidationContainer using fast path if possible,
  or slow path by calling LayoutObject::mapToVisibleRectToAncestor().

- Let selection paint invalidation go through fast-path if possible.

BUG=591199

Review URL: https://codereview.chromium.org/1813383002

Cr-Commit-Position: refs/heads/master@{#383430}

1 files changed, 3 insertions, 1 deletions

diff --git a/third_party/WebKit/Source/core/paint/SVGContainerPainter.cpp b/third_party/WebKit/Source/core/paint/SVGContainerPainter.cpp
index 94e198a..6ff1ca7 100644
--- a/third_party/WebKit/Source/core/paint/SVGContainerPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/SVGContainerPainter.cpp
@@ -24,7 +24,9 @@ void SVGContainerPainter::paint(const PaintInfo& paintInfo)
         return;
 
     FloatRect boundingBox = m_layoutSVGContainer.paintInvalidationRectInLocalSVGCoordinates();
-    if (!paintInfo.cullRect().intersectsCullRect(m_layoutSVGContainer.localToSVGParentTransform(), boundingBox))
+    // LayoutSVGHiddenContainer's paint invalidation rect is always empty but we need to paint its descendants.
+    if (!m_layoutSVGContainer.isSVGHiddenContainer()
+        && !paintInfo.cullRect().intersectsCullRect(m_layoutSVGContainer.localToSVGParentTransform(), boundingBox))
         return;
 
     // Spec: An empty viewBox on the <svg> element disables rendering.