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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_COMPRESSION_ATTRIBUTES_PREDICTION_SCHEMES_MESH_PREDICTION_SCHEME_TEX_COORDS_PORTABLE_DECODER_H_
#define DRACO_COMPRESSION_ATTRIBUTES_PREDICTION_SCHEMES_MESH_PREDICTION_SCHEME_TEX_COORDS_PORTABLE_DECODER_H_
#include "draco/compression/attributes/prediction_schemes/mesh_prediction_scheme_decoder.h"
#include "draco/compression/attributes/prediction_schemes/mesh_prediction_scheme_tex_coords_portable_predictor.h"
#include "draco/compression/bit_coders/rans_bit_decoder.h"
namespace draco {
// Decoder for predictions of UV coordinates encoded by our specialized and
// portable texture coordinate predictor. See the corresponding encoder for more
// details.
template <typename DataTypeT, class TransformT, class MeshDataT>
class MeshPredictionSchemeTexCoordsPortableDecoder
: public MeshPredictionSchemeDecoder<DataTypeT, TransformT, MeshDataT> {
public:
using CorrType = typename MeshPredictionSchemeDecoder<DataTypeT, TransformT,
MeshDataT>::CorrType;
MeshPredictionSchemeTexCoordsPortableDecoder(const PointAttribute *attribute,
const TransformT &transform,
const MeshDataT &mesh_data)
: MeshPredictionSchemeDecoder<DataTypeT, TransformT, MeshDataT>(
attribute, transform, mesh_data),
predictor_(mesh_data) {}
bool ComputeOriginalValues(const CorrType *in_corr, DataTypeT *out_data,
int size, int num_components,
const PointIndex *entry_to_point_id_map) override;
bool DecodePredictionData(DecoderBuffer *buffer) override;
PredictionSchemeMethod GetPredictionMethod() const override {
return MESH_PREDICTION_TEX_COORDS_PORTABLE;
}
bool IsInitialized() const override {
if (!predictor_.IsInitialized())
return false;
if (!this->mesh_data().IsInitialized())
return false;
return true;
}
int GetNumParentAttributes() const override { return 1; }
GeometryAttribute::Type GetParentAttributeType(int i) const override {
DRACO_DCHECK_EQ(i, 0);
(void)i;
return GeometryAttribute::POSITION;
}
bool SetParentAttribute(const PointAttribute *att) override {
if (!att || att->attribute_type() != GeometryAttribute::POSITION)
return false; // Invalid attribute type.
if (att->num_components() != 3)
return false; // Currently works only for 3 component positions.
predictor_.SetPositionAttribute(*att);
return true;
}
private:
MeshPredictionSchemeTexCoordsPortablePredictor<DataTypeT, MeshDataT>
predictor_;
};
template <typename DataTypeT, class TransformT, class MeshDataT>
bool MeshPredictionSchemeTexCoordsPortableDecoder<
DataTypeT, TransformT,
MeshDataT>::ComputeOriginalValues(const CorrType *in_corr,
DataTypeT *out_data, int /* size */,
int num_components,
const PointIndex *entry_to_point_id_map) {
predictor_.SetEntryToPointIdMap(entry_to_point_id_map);
this->transform().Init(num_components);
const int corner_map_size =
static_cast<int>(this->mesh_data().data_to_corner_map()->size());
for (int p = 0; p < corner_map_size; ++p) {
const CornerIndex corner_id = this->mesh_data().data_to_corner_map()->at(p);
if (!predictor_.template ComputePredictedValue<false>(corner_id, out_data,
p))
return false;
const int dst_offset = p * num_components;
this->transform().ComputeOriginalValue(predictor_.predicted_value(),
in_corr + dst_offset,
out_data + dst_offset);
}
return true;
}
template <typename DataTypeT, class TransformT, class MeshDataT>
bool MeshPredictionSchemeTexCoordsPortableDecoder<
DataTypeT, TransformT, MeshDataT>::DecodePredictionData(DecoderBuffer
*buffer) {
// Decode the delta coded orientations.
int32_t num_orientations = 0;
if (!buffer->Decode(&num_orientations) || num_orientations < 0)
return false;
predictor_.ResizeOrientations(num_orientations);
bool last_orientation = true;
RAnsBitDecoder decoder;
if (!decoder.StartDecoding(buffer))
return false;
for (int i = 0; i < num_orientations; ++i) {
if (!decoder.DecodeNextBit())
last_orientation = !last_orientation;
predictor_.set_orientation(i, last_orientation);
}
decoder.EndDecoding();
return MeshPredictionSchemeDecoder<DataTypeT, TransformT,
MeshDataT>::DecodePredictionData(buffer);
}
} // namespace draco
#endif // DRACO_COMPRESSION_ATTRIBUTES_PREDICTION_SCHEMES_MESH_PREDICTION_SCHEME_TEX_COORDS_PORTABLE_DECODER_H_
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