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4xm_utils.h
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68 lines (58 loc) · 1.91 KB
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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "common/array.h"
#include "common/compression/huffman.h"
#include "common/debug.h"
namespace Video {
namespace FourXM {
template<typename HuffmanType>
HuffmanType loadStatistics(const byte *&huff, uint &offset) {
Common::Array<uint32> freqs, symbols;
uint8 freq_first = huff[offset++];
do {
uint8 freq_last = huff[offset++];
if (freq_first <= freq_last) {
for (auto idx = freq_first; idx <= freq_last; ++idx) {
auto freq = huff[offset++];
if (freq != 0) {
freqs.push_back(freq);
symbols.push_back(idx);
}
}
}
freq_first = huff[offset++];
} while (freq_first != 0);
freqs.push_back(1);
symbols.push_back(256);
return HuffmanType::fromFrequencies(freqs.size(), freqs.data(), symbols.data());
}
void idct(int16_t block[64], int shift = 6);
inline int readInt(int value, unsigned n) {
if ((value & (1 << (n - 1))) == 0)
value += 1 - (1 << n);
return value;
}
template<typename BitStream>
inline int readInt(BitStream &bs, size_t n) {
return readInt(bs.getBits(n), n);
}
} // namespace FourXM
} // namespace Video