48 lines
2.1 KiB
C++
48 lines
2.1 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_COMPRESSION_ENTROPY_SYMBOL_ENCODING_H_
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#define DRACO_COMPRESSION_ENTROPY_SYMBOL_ENCODING_H_
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#include "draco/compression/config/compression_shared.h"
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#include "draco/core/encoder_buffer.h"
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#include "draco/core/options.h"
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namespace draco {
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// Encodes an array of symbols using an entropy coding. This function
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// automatically decides whether to encode the symbol values using bit
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// length tags (see EncodeTaggedSymbols), or whether to encode them directly
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// (see EncodeRawSymbols). The symbols can be grouped into separate components
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// that can be used for better compression. |options| is an optional parameter
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// that allows more direct control over various stages of the symbol encoding
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// (see below for functions that are used to set valid options).
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// Returns false on error.
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bool EncodeSymbols(const uint32_t *symbols, int num_values, int num_components,
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const Options *options, EncoderBuffer *target_buffer);
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// Sets an option that forces symbol encoder to use the specified encoding
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// method.
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void SetSymbolEncodingMethod(Options *options, SymbolCodingMethod method);
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// Sets the desired compression level for symbol encoding in range <0, 10> where
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// 0 is the worst but fastest compression and 10 is the best but slowest
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// compression. If the option is not set, default value of 7 is used.
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// Returns false if an invalid level has been set.
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bool SetSymbolEncodingCompressionLevel(Options *options, int compression_level);
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} // namespace draco
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#endif // DRACO_COMPRESSION_ENTROPY_SYMBOL_ENCODING_H_
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