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73bb3c8530
- Improved compression for triangular meshes (~10%) - Added WebAssembly decoder - Code cleanup + robustness fixes
52 lines
1.8 KiB
C++
52 lines
1.8 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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#ifndef DRACO_CORE_SYMBOL_DECODING_H_
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#define DRACO_CORE_SYMBOL_DECODING_H_
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#include "core/decoder_buffer.h"
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namespace draco {
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// Converts unsigned integer symbols encoded with an entropy encoder back to
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// signed values.
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void ConvertSymbolsToSignedInts(const uint32_t *in, int in_values,
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int32_t *out);
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// Converts a single unsigned integer symbol encoded with an entropy encoder
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// back to a signed value.
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template <class IntTypeT>
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typename std::make_signed<IntTypeT>::type ConvertSymbolToSignedInt(
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IntTypeT val) {
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static_assert(std::is_integral<IntTypeT>::value, "IntTypeT is not integral.");
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typedef typename std::make_signed<IntTypeT>::type SignedType;
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const bool is_positive = !static_cast<bool>(val & 1);
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val >>= 1;
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if (is_positive) {
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return static_cast<SignedType>(val);
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}
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SignedType ret = static_cast<SignedType>(val);
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ret = -ret - 1;
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return ret;
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}
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// Decodes an array of symbols that was previously encoded with an entropy code.
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// Returns false on error.
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bool DecodeSymbols(int num_values, int num_components,
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DecoderBuffer *src_buffer, uint32_t *out_values);
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} // namespace draco
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#endif // DRACO_CORE_SYMBOL_DECODING_H_
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