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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.
#ifndef LIB_JXL_TOC_H_
#define LIB_JXL_TOC_H_
#include <stddef.h>
#include <stdint.h>
#include <vector>
#include "lib/jxl/base/compiler_specific.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/coeff_order_fwd.h"
#include "lib/jxl/dec_bit_reader.h"
#include "lib/jxl/field_encodings.h"
namespace jxl {
// (2+bits) = 2,3,4 bytes so encoders can patch TOC after encoding.
// 30 is sufficient for 4K channels of uncompressed 16-bit samples.
constexpr U32Enc kTocDist(Bits(10), BitsOffset(14, 1024), BitsOffset(22, 17408),
BitsOffset(30, 4211712));
size_t MaxBits(const size_t num_sizes);
// TODO(veluca): move these to FrameDimensions.
static JXL_INLINE size_t AcGroupIndex(size_t pass, size_t group,
size_t num_groups, size_t num_dc_groups,
bool has_ac_global) {
return 1 + num_dc_groups + static_cast<size_t>(has_ac_global) +
pass * num_groups + group;
}
static JXL_INLINE size_t NumTocEntries(size_t num_groups, size_t num_dc_groups,
size_t num_passes, bool has_ac_global) {
if (num_groups == 1 && num_passes == 1) return 1;
return AcGroupIndex(0, 0, num_groups, num_dc_groups, has_ac_global) +
num_groups * num_passes;
}
Status ReadToc(size_t toc_entries, BitReader* JXL_RESTRICT reader,
std::vector<uint32_t>* JXL_RESTRICT sizes,
std::vector<coeff_order_t>* JXL_RESTRICT permutation);
Status ReadGroupOffsets(size_t toc_entries, BitReader* JXL_RESTRICT reader,
std::vector<uint64_t>* JXL_RESTRICT offsets,
std::vector<uint32_t>* JXL_RESTRICT sizes,
uint64_t* total_size);
} // namespace jxl
#endif // LIB_JXL_TOC_H_
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