/*
 * 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
 * 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.
 */

#include "third_party/blink/renderer/core/layout/hit_testing_transform_state.h"

#include "third_party/blink/renderer/platform/geometry/layout_rect.h"

namespace blink {

void HitTestingTransformState::Translate(int x,
                                         int y,
                                         TransformAccumulation accumulate) {
  accumulated_transform_.Translate(x, y);
  if (accumulate == kFlattenTransform)
    FlattenWithTransform(accumulated_transform_);

  accumulating_transform_ = accumulate == kAccumulateTransform;
}

void HitTestingTransformState::ApplyTransform(
    const TransformationMatrix& transform_from_container,
    TransformAccumulation accumulate) {
  accumulated_transform_.Multiply(transform_from_container);
  if (accumulate == kFlattenTransform)
    FlattenWithTransform(accumulated_transform_);

  accumulating_transform_ = accumulate == kAccumulateTransform;
}

void HitTestingTransformState::Flatten() {
  FlattenWithTransform(accumulated_transform_);
}

void HitTestingTransformState::FlattenWithTransform(
    const TransformationMatrix& t) {
  TransformationMatrix inverse_transform = t.Inverse();
  last_planar_point_ = inverse_transform.ProjectPoint(last_planar_point_);
  last_planar_quad_ = inverse_transform.ProjectQuad(last_planar_quad_);
  last_planar_area_ = inverse_transform.ProjectQuad(last_planar_area_);

  accumulated_transform_.MakeIdentity();
  accumulating_transform_ = false;
}

FloatPoint HitTestingTransformState::MappedPoint() const {
  return accumulated_transform_.Inverse().ProjectPoint(last_planar_point_);
}

FloatQuad HitTestingTransformState::MappedQuad() const {
  return accumulated_transform_.Inverse().ProjectQuad(last_planar_quad_);
}

FloatQuad HitTestingTransformState::MappedArea() const {
  return accumulated_transform_.Inverse().ProjectQuad(last_planar_area_);
}

LayoutRect HitTestingTransformState::BoundsOfMappedArea() const {
  return accumulated_transform_.Inverse().ClampedBoundsOfProjectedQuad(
      last_planar_area_);
}

}  // namespace blink