Account for perspective and preserve-3d in mapToVisualRectInAncestorSpace

third_party/WebKit/Source/platform/geometry/TransformState.h

 /*
  * Copyright (C) 2011 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
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 #ifndef TransformState_h
 #define TransformState_h
 
+#include <memory>
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/FloatQuad.h"
 #include "platform/geometry/IntSize.h"
+#include "platform/geometry/LayoutPoint.h"
 #include "platform/geometry/LayoutSize.h"
 #include "platform/transforms/AffineTransform.h"
 #include "platform/transforms/TransformationMatrix.h"
 #include "wtf/Allocator.h"
-#include <memory>
 
 namespace blink {
 
 class PLATFORM_EXPORT TransformState {
   STACK_ALLOCATED();
 
  public:
   enum TransformDirection {
     ApplyTransformDirection,
     UnapplyInverseTransformDirection
@@ skipping 33 matching lines @@
         m_accumulatingTransform(true),
         m_forceAccumulatingTransform(true),
         m_mapPoint(false),
         m_mapQuad(false),
         m_direction(mappingDirection) {}
 
   TransformState(const TransformState& other) { *this = other; }
 
   TransformState& operator=(const TransformState&);
 
+  // Note: this overrides the quad and ignores any accumulatedOffset.
+  // If it's desired to include the offset, call flatten() first.
   void setQuad(const FloatQuad& quad) {
+    DCHECK(!m_accumulatingTransform);
     // FIXME: this assumes that the quad being added is in the coordinate system
     // of the current state.  This breaks if we're simultaneously mapping a
     // point.  https://bugs.webkit.org/show_bug.cgi?id=106680
     ASSERT(!m_mapPoint);
     m_accumulatedOffset = LayoutSize();
     m_lastPlanarQuad = quad;
   }
 
   void move(LayoutUnit x,
             LayoutUnit y,
             TransformAccumulation accumulate = FlattenTransform) {
     move(LayoutSize(x, y), accumulate);
   }
 
   void move(const LayoutSize&, TransformAccumulation = FlattenTransform);
   void move(const IntSize& size,
             TransformAccumulation accumulate = FlattenTransform) {
     move(LayoutSize(size), accumulate);
   }
+  void moveBy(const LayoutPoint& point,
+              TransformAccumulation accumulate = FlattenTransform) {
+    move(LayoutSize(point.x(), point.y()), accumulate);
+  }
   void applyTransform(const AffineTransform& transformFromContainer,
                       TransformAccumulation = FlattenTransform,
                       bool* wasClamped = 0);
   void applyTransform(const TransformationMatrix& transformFromContainer,
                       TransformAccumulation = FlattenTransform,
                       bool* wasClamped = 0);
   void flatten(bool* wasClamped = 0);
 
   // Return the coords of the point or quad in the last flattened layer
   FloatPoint lastPlanarPoint() const { return m_lastPlanarPoint; }
@@ skipping 20 matching lines @@
   LayoutSize m_accumulatedOffset;
   bool m_accumulatingTransform;
   bool m_forceAccumulatingTransform;
   bool m_mapPoint, m_mapQuad;
   TransformDirection m_direction;
 };
 
 }  // namespace blink
 
 #endif  // TransformState_h