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// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "lib/jxl/enc_toc.h"
#include <stdint.h>
#include "lib/jxl/coeff_order.h"
#include "lib/jxl/common.h"
#include "lib/jxl/enc_aux_out.h"
#include "lib/jxl/enc_coeff_order.h"
#include "lib/jxl/field_encodings.h"
#include "lib/jxl/fields.h"
#include "lib/jxl/toc.h"
namespace jxl {
Status WriteGroupOffsets(const std::vector<BitWriter>& group_codes,
const std::vector<coeff_order_t>* permutation,
BitWriter* JXL_RESTRICT writer, AuxOut* aux_out) {
BitWriter::Allotment allotment(writer, MaxBits(group_codes.size()));
if (permutation && !group_codes.empty()) {
// Don't write a permutation at all for an empty group_codes.
writer->Write(1, 1); // permutation
JXL_DASSERT(permutation->size() == group_codes.size());
EncodePermutation(permutation->data(), /*skip=*/0, permutation->size(),
writer, /* layer= */ 0, aux_out);
} else {
writer->Write(1, 0); // no permutation
}
writer->ZeroPadToByte(); // before TOC entries
for (size_t i = 0; i < group_codes.size(); i++) {
JXL_ASSERT(group_codes[i].BitsWritten() % kBitsPerByte == 0);
const size_t group_size = group_codes[i].BitsWritten() / kBitsPerByte;
JXL_RETURN_IF_ERROR(U32Coder::Write(kTocDist, group_size, writer));
}
writer->ZeroPadToByte(); // before first group
allotment.ReclaimAndCharge(writer, kLayerTOC, aux_out);
return true;
}
} // namespace jxl
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