third_party/blink/renderer/platform/transforms/interpolated_transform_operation.cc

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
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 *     * Redistributions in binary form must reproduce the above
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "third_party/blink/renderer/platform/transforms/interpolated_transform_operation.h"

#include "third_party/blink/renderer/platform/transforms/identity_transform_operation.h"

namespace blink {

bool InterpolatedTransformOperation::operator==(
    const TransformOperation& o) const {
  if (!IsSameType(o))
    return false;
  const InterpolatedTransformOperation* t =
      static_cast<const InterpolatedTransformOperation*>(&o);
  return progress == t->progress && from == t->from && to == t->to;
}

void InterpolatedTransformOperation::Apply(
    TransformationMatrix& transform,
    const FloatSize& border_box_size) const {
  TransformationMatrix from_transform;
  TransformationMatrix to_transform;
  from.ApplyRemaining(border_box_size, starting_index, from_transform);
  to.ApplyRemaining(border_box_size, starting_index, to_transform);

  to_transform.Blend(from_transform, progress);
  transform.Multiply(to_transform);
}

scoped_refptr<TransformOperation> InterpolatedTransformOperation::Blend(
    const TransformOperation* from,
    double progress,
    bool blend_to_identity) {
  if (from && !from->IsSameType(*this))
    return this;

  TransformOperations this_operations;
  this_operations.Operations().push_back(this);
  TransformOperations from_operations;
  if (blend_to_identity)
    from_operations.Operations().push_back(
        IdentityTransformOperation::Create());
  else
    from_operations.Operations().push_back(
        const_cast<TransformOperation*>(from));
  return InterpolatedTransformOperation::Create(this_operations,
                                                from_operations, 0, progress);
}

}  // namespace blink