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+/*
+ * Copyright (C) 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef RenderGeometryMap_h
+#define RenderGeometryMap_h
+
+#include "FloatPoint.h"
+#include "FloatQuad.h"
+#include "IntSize.h"
+#include "RenderObject.h"
+#include "TransformationMatrix.h"
+#include <wtf/OwnPtr.h>
+
+namespace WebCore {
+
+class RenderGeometryMapStep;
+
+// Can be used while walking the Renderer tree to cache data about offsets and transforms.
+class RenderGeometryMap {
+public:
+ RenderGeometryMap();
+ ~RenderGeometryMap();
+
+ FloatPoint absolutePoint(const FloatPoint&) const;
+ FloatRect absoluteRect(const FloatRect&) const;
+
+ // Called by code walking the renderer or layer trees.
+ void pushMappingsToAncestor(const RenderObject*, const RenderBoxModelObject* ancestor);
+ void popMappingsToAncestor(const RenderBoxModelObject*);
+
+ // The following methods should only be called by renderers inside a call to pushMappingsToAncestor().
+
+ // Push geometry info between this renderer and some ancestor. The ancestor must be its container() or some
+ // stacking context between the renderer and its container.
+ void push(const RenderObject*, const LayoutSize&, bool accumulatingTransform = false, bool isNonUniform = false, bool isFixedPosition = false, bool hasTransform = false);
+ void push(const RenderObject*, const TransformationMatrix&, bool accumulatingTransform = false, bool isNonUniform = false, bool isFixedPosition = false, bool hasTransform = false);
+
+ // RenderView gets special treatment, because it applies the scroll offset only for elements inside in fixed position.
+ void pushView(const RenderView*, const LayoutSize& scrollOffset, const TransformationMatrix* = 0);
+
+private:
+ void mapToAbsolute(TransformState&) const;
+
+ void stepInserted(const RenderGeometryMapStep&);
+ void stepRemoved(const RenderGeometryMapStep&);
+
+ bool hasNonUniformStep() const { return m_nonUniformStepsCount; }
+ bool hasTransformStep() const { return m_transformedStepsCount; }
+ bool hasFixedPositionStep() const { return m_fixedStepsCount; }
+
+ typedef Vector<OwnPtr<RenderGeometryMapStep> > RenderGeometryMapSteps; // FIXME: inline capacity?
+
+ size_t m_insertionPosition;
+ int m_nonUniformStepsCount;
+ int m_transformedStepsCount;
+ int m_fixedStepsCount;
+ RenderGeometryMapSteps m_mapping;
+ LayoutSize m_accumulatedOffset;
+};
+
+} // namespace WebCore
+
+#endif // RenderGeometryMap_h