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https://git.mirrors.martin98.com/https://github.com/google/draco
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73bb3c8530
- Improved compression for triangular meshes (~10%) - Added WebAssembly decoder - Code cleanup + robustness fixes
48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
#include "core/symbol_bit_decoder.h"
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#include "core/symbol_decoding.h"
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namespace draco {
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bool SymbolBitDecoder::StartDecoding(DecoderBuffer *source_buffer) {
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uint32_t size;
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if (!source_buffer->Decode(&size))
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return false;
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symbols_.resize(size);
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if (!DecodeSymbols(size, 1, source_buffer, symbols_.data()))
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return false;
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std::reverse(symbols_.begin(), symbols_.end());
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return true;
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}
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bool SymbolBitDecoder::DecodeNextBit() {
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uint32_t symbol;
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DecodeLeastSignificantBits32(1, &symbol);
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DCHECK(symbol == 0 || symbol == 1);
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return symbol == 1;
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}
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void SymbolBitDecoder::DecodeLeastSignificantBits32(int nbits,
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uint32_t *value) {
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DCHECK_LE(1, nbits);
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DCHECK_LE(nbits, 32);
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DCHECK_NE(value, nullptr);
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// Testing: check to make sure there is something to decode.
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DCHECK_GT(symbols_.size(), 0);
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(*value) = symbols_.back();
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symbols_.pop_back();
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const int discarded_bits = 32 - nbits;
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(*value) <<= discarded_bits;
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(*value) >>= discarded_bits;
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}
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void SymbolBitDecoder::Clear() {
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symbols_.clear();
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symbols_.shrink_to_fit();
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}
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} // namespace draco
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