Initial PaintInvalidationState support for SVG

Source/core/rendering/svg/SVGRenderSupport.cpp

 /*
  * Copyright (C) 2007, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 44 matching lines @@
     // map to parent coords and recurse up the parent chain.
     FloatRect paintInvalidationRect = object->paintInvalidationRectInLocalCoordinates();
     object->computeFloatRectForPaintInvalidation(paintInvalidationContainer, paintInvalidationRect, paintInvalidationState);
     return enclosingLayoutRect(paintInvalidationRect);
 }
 
 void SVGRenderSupport::computeFloatRectForPaintInvalidation(const RenderObject* object, const RenderLayerModelObject* paintInvalidationContainer, FloatRect& paintInvalidationRect, const PaintInvalidationState* paintInvalidationState)
 {
     paintInvalidationRect.inflate(object->style()->outlineWidth());
 
+    if (paintInvalidationState && paintInvalidationState->canMapToContainer(paintInvalidationContainer)) {
+        // Compute accumulated SVG transform and apply to local paint rect.
+        AffineTransform transform = paintInvalidationState->svgTransform() * object->localToParentTransform();
+        paintInvalidationRect = transform.mapRect(paintInvalidationRect);
+        // FIXME: These are quirks carried forward from RenderSVGRoot::computeFloatRectForPaintInvalidation.
+        LayoutRect rect;
+        if (!paintInvalidationRect.isEmpty())
+            rect = enclosingIntRect(paintInvalidationRect);
+        // Offset by SVG root paint offset and apply clipping as needed.
+        rect.move(paintInvalidationState->paintOffset());
+        if (paintInvalidationState->isClipped())
+            rect.intersect(paintInvalidationState->clipRect());
+        paintInvalidationRect = rect;
+        return;
+    }
+
     // Translate to coords in our parent renderer, and then call computeFloatRectForPaintInvalidation() on our parent.
     paintInvalidationRect = object->localToParentTransform().mapRect(paintInvalidationRect);
     object->parent()->computeFloatRectForPaintInvalidation(paintInvalidationContainer, paintInvalidationRect, paintInvalidationState);
 }
 
 void SVGRenderSupport::mapLocalToContainer(const RenderObject* object, const RenderLayerModelObject* paintInvalidationContainer, TransformState& transformState, bool* wasFixed, const PaintInvalidationState* paintInvalidationState)
 {
     transformState.applyTransform(object->localToParentTransform());
 
+    if (paintInvalidationState && paintInvalidationState->canMapToContainer(paintInvalidationContainer)) {
+        // |svgTransform| contains localToBorderBoxTransform mentioned below.
+        transformState.applyTransform(paintInvalidationState->svgTransform());
+        transformState.move(paintInvalidationState->paintOffset());
+        return;
+    }
+
     RenderObject* parent = object->parent();
 
     // At the SVG/HTML boundary (aka RenderSVGRoot), we apply the localToBorderBoxTransform
     // to map an element from SVG viewport coordinates to CSS box coordinates.
     // RenderSVGRoot's mapLocalToContainer method expects CSS box coordinates.
     if (parent->isSVGRoot())
         transformState.applyTransform(toRenderSVGRoot(parent)->localToBorderBoxTransform());
 
     MapCoordinatesFlags mode = UseTransforms;
     parent->mapLocalToContainer(paintInvalidationContainer, transformState, mode, wasFixed, paintInvalidationState);
@@ skipping 292 matching lines @@
 }
 
 bool SVGRenderSupport::isRenderableTextNode(const RenderObject* object)
 {
     ASSERT(object->isText());
     // <br> is marked as text, but is not handled by the SVG rendering code-path.
     return object->isSVGInlineText() && !toRenderSVGInlineText(object)->hasEmptyText();
 }
 
 }