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73bb3c8530
- Improved compression for triangular meshes (~10%) - Added WebAssembly decoder - Code cleanup + robustness fixes
64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
// Copyright 2016 The Draco Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "compression/attributes/prediction_schemes/prediction_scheme_encoder_factory.h"
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namespace draco {
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PredictionSchemeMethod SelectPredictionMethod(
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int att_id, const PointCloudEncoder *encoder) {
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if (encoder->options()->GetSpeed() >= 10) {
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return PREDICTION_NONE; // No prediction when the fastest speed is
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// requested.
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}
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if (encoder->GetGeometryType() == TRIANGULAR_MESH) {
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// Use speed setting to select the best encoding method.
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const PointAttribute *const att = encoder->point_cloud()->attribute(att_id);
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if (att->attribute_type() == GeometryAttribute::TEX_COORD) {
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if (encoder->options()->GetSpeed() < 4) {
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// Use texture coordinate prediction for speeds 0, 1, 2, 3.
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return MESH_PREDICTION_TEX_COORDS;
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}
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}
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// Handle other attribute types.
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if (encoder->options()->GetSpeed() >= 8) {
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return PREDICTION_DIFFERENCE;
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}
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if (encoder->options()->GetSpeed() >= 2 ||
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encoder->point_cloud()->num_points() < 40) {
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// Parallelogram prediction is used for speeds 2 - 7 or when the overhead
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// of using constrained multi parallelogram would be too high.
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return MESH_PREDICTION_PARALLELOGRAM;
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}
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// Multi-parallelogram is used for speeds 0, 1.
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return MESH_PREDICTION_CONSTRAINED_MULTI_PARALLELOGRAM;
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}
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// Default option is delta coding.
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return PREDICTION_DIFFERENCE;
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}
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// Returns the preferred prediction scheme based on the encoder options.
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PredictionSchemeMethod GetPredictionMethodFromOptions(
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int att_id, const EncoderOptions &options) {
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const int pred_type =
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options.GetAttributeInt(att_id, "prediction_scheme", -1);
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if (pred_type == -1)
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return PREDICTION_UNDEFINED;
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if (pred_type < 0 || pred_type >= NUM_PREDICTION_SCHEMES)
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return PREDICTION_NONE;
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return static_cast<PredictionSchemeMethod>(pred_type);
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}
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} // namespace draco
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