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// Copyright 2017 The Draco Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef DRACO_ATTRIBUTES_ATTRIBUTE_TRANSFORM_H_
#define DRACO_ATTRIBUTES_ATTRIBUTE_TRANSFORM_H_
#include "draco/attributes/attribute_transform_data.h"
#include "draco/attributes/point_attribute.h"
#include "draco/core/decoder_buffer.h"
#include "draco/core/encoder_buffer.h"
namespace draco {
// Virtual base class for various attribute transforms, enforcing common
// interface where possible.
class AttributeTransform {
public:
virtual ~AttributeTransform() = default;
// Return attribute transform type.
virtual AttributeTransformType Type() const = 0;
// Try to init transform from attribute.
virtual bool InitFromAttribute(const PointAttribute &attribute) = 0;
// Copy parameter values into the provided AttributeTransformData instance.
virtual void CopyToAttributeTransformData(
AttributeTransformData *out_data) const = 0;
bool TransferToAttribute(PointAttribute *attribute) const;
// Applies the transform to |attribute| and stores the result in
// |target_attribute|. |point_ids| is an optional vector that can be used to
// remap values during the transform.
virtual bool TransformAttribute(const PointAttribute &attribute,
const std::vector<PointIndex> &point_ids,
PointAttribute *target_attribute) = 0;
// Applies an inverse transform to |attribute| and stores the result in
// |target_attribute|. In this case, |attribute| is an attribute that was
// already transformed (e.g. quantized) and |target_attribute| is the
// attribute before the transformation.
virtual bool InverseTransformAttribute(const PointAttribute &attribute,
PointAttribute *target_attribute) = 0;
// Encodes all data needed by the transformation into the |encoder_buffer|.
virtual bool EncodeParameters(EncoderBuffer *encoder_buffer) const = 0;
// Decodes all data needed to transform |attribute| back to the original
// format.
virtual bool DecodeParameters(const PointAttribute &attribute,
DecoderBuffer *decoder_buffer) = 0;
// Initializes a transformed attribute that can be used as target in the
// TransformAttribute() function call.
virtual std::unique_ptr<PointAttribute> InitTransformedAttribute(
const PointAttribute &src_attribute, int num_entries);
protected:
virtual DataType GetTransformedDataType(
const PointAttribute &attribute) const = 0;
virtual int GetTransformedNumComponents(
const PointAttribute &attribute) const = 0;
};
} // namespace draco
#endif // DRACO_ATTRIBUTES_ATTRIBUTE_OCTAHEDRON_TRANSFORM_H_
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