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

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#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_TRANSFORMS_INTERPOLATED_TRANSFORM_OPERATION_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TRANSFORMS_INTERPOLATED_TRANSFORM_OPERATION_H_

#include "third_party/blink/renderer/platform/transforms/transform_operation.h"
#include "third_party/blink/renderer/platform/transforms/transform_operations.h"

namespace blink {

// This class is an implementation detail for deferred interpolations.
class PLATFORM_EXPORT InterpolatedTransformOperation final
    : public TransformOperation {
 public:
  static scoped_refptr<InterpolatedTransformOperation> Create(
      const TransformOperations& from,
      const TransformOperations& to,
      int starting_index,
      double progress) {
    return base::AdoptRef(
        new InterpolatedTransformOperation(from, to, starting_index, progress));
  }

  bool CanBlendWith(const TransformOperation& other) const override {
    return IsSameType(other);
  }

 private:
  OperationType GetType() const override { return kInterpolated; }

  bool operator==(const TransformOperation&) const override;
  void Apply(TransformationMatrix&,
             const FloatSize& border_box_size) const override;

  scoped_refptr<TransformOperation> Blend(
      const TransformOperation* from,
      double progress,
      bool blend_to_identity = false) override;
  scoped_refptr<TransformOperation> Zoom(double factor) final {
    return Create(from.Zoom(factor), to.Zoom(factor), starting_index, progress);
  }

  bool DependsOnBoxSize() const override {
    return from.DependsOnBoxSize() || to.DependsOnBoxSize();
  }

  InterpolatedTransformOperation(const TransformOperations& from,
                                 const TransformOperations& to,
                                 int starting_index,
                                 double progress)
      : from(from),
        to(to),
        starting_index(starting_index),
        progress(progress) {}

  const TransformOperations from;
  const TransformOperations to;
  // Number of operations to skip from the start of each list. By spec,
  // pairwise interpolations are performed for compatible operations at the
  // start of the list and matrix interpolation for the remainder.
  int starting_index;
  double progress;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TRANSFORMS_INTERPOLATED_TRANSFORM_OPERATION_H_