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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_JPEGLI_DECODE_INTERNAL_H_
#define LIB_JPEGLI_DECODE_INTERNAL_H_
#include <stdint.h>
#include <sys/types.h>
#include <vector>
#include "lib/jpegli/common.h"
#include "lib/jpegli/common_internal.h"
#include "lib/jpegli/huffman.h"
namespace jpegli {
static constexpr int kNeedMoreInput = 100;
static constexpr int kHandleRestart = 101;
static constexpr int kHandleMarkerProcessor = 102;
static constexpr int kProcessNextMarker = 103;
static constexpr size_t kAllHuffLutSize = NUM_HUFF_TBLS * kJpegHuffmanLutSize;
typedef int16_t coeff_t;
// State of the decoder that has to be saved before decoding one MCU in case
// we run out of the bitstream.
struct MCUCodingState {
coeff_t last_dc_coeff[kMaxComponents];
int eobrun;
coeff_t coeffs[D_MAX_BLOCKS_IN_MCU * DCTSIZE2];
};
} // namespace jpegli
// Use this forward-declared libjpeg struct to hold all our private variables.
// TODO(szabadka) Remove variables that have a corresponding version in cinfo.
struct jpeg_decomp_master {
//
// Input handling state.
//
std::vector<uint8_t> input_buffer_;
size_t input_buffer_pos_;
// Number of bits after codestream_pos_ that were already processed.
size_t codestream_bits_ahead_;
// Coefficient buffers
jvirt_barray_ptr* coef_arrays;
JBLOCKARRAY coeff_rows[jpegli::kMaxComponents];
bool streaming_mode_;
//
// Marker data processing state.
//
bool found_soi_;
bool found_dri_;
bool found_sof_;
bool found_eoi_;
// Whether this jpeg has multiple scans (progressive or non-interleaved
// sequential).
bool is_multiscan_;
size_t icc_index_;
size_t icc_total_;
std::vector<uint8_t> icc_profile_;
jpegli::HuffmanTableEntry dc_huff_lut_[jpegli::kAllHuffLutSize];
jpegli::HuffmanTableEntry ac_huff_lut_[jpegli::kAllHuffLutSize];
uint8_t markers_to_save_[32];
jpeg_marker_parser_method app_marker_parsers[16];
jpeg_marker_parser_method com_marker_parser;
// Fields defined by SOF marker.
size_t iMCU_cols_;
int h_factor[jpegli::kMaxComponents];
int v_factor[jpegli::kMaxComponents];
// Initialized at strat of frame.
uint16_t scan_progression_[jpegli::kMaxComponents][DCTSIZE2];
//
// Per scan state.
//
size_t scan_mcu_row_;
size_t scan_mcu_col_;
size_t mcu_rows_per_iMCU_row_;
jpegli::coeff_t last_dc_coeff_[jpegli::kMaxComponents];
int eobrun_;
int restarts_to_go_;
int next_restart_marker_;
jpegli::MCUCodingState mcu_;
//
// Rendering state.
//
int output_passes_done_;
JpegliDataType output_data_type_ = JPEGLI_TYPE_UINT8;
size_t xoffset_;
bool swap_endianness_ = false;
bool need_context_rows_;
bool regenerate_inverse_colormap_;
bool apply_smoothing;
int min_scaled_dct_size;
int scaled_dct_size[jpegli::kMaxComponents];
size_t raw_height_[jpegli::kMaxComponents];
jpegli::RowBuffer<float> raw_output_[jpegli::kMaxComponents];
jpegli::RowBuffer<float> render_output_[jpegli::kMaxComponents];
void (*inverse_transform[jpegli::kMaxComponents])(
const int16_t* JXL_RESTRICT qblock, const float* JXL_RESTRICT dequant,
const float* JXL_RESTRICT biases, float* JXL_RESTRICT scratch_space,
float* JXL_RESTRICT output, size_t output_stride, size_t dctsize);
void (*color_transform)(float* row[jpegli::kMaxComponents], size_t len);
float* idct_scratch_;
float* upsample_scratch_;
uint8_t* output_scratch_;
int16_t* smoothing_scratch_;
float* dequant_;
// 1 = 1pass, 2 = 2pass, 3 = external
int quant_mode_;
int quant_pass_;
int num_colors_[jpegli::kMaxComponents];
uint8_t* colormap_lut_;
uint8_t* pixels_;
JSAMPARRAY scanlines_;
std::vector<std::vector<uint8_t>> candidate_lists_;
float* dither_[jpegli::kMaxComponents];
float* error_row_[2 * jpegli::kMaxComponents];
size_t dither_size_;
size_t dither_mask_;
// Per channel and per frequency statistics about the number of nonzeros and
// the sum of coefficient absolute values, used in dequantization bias
// computation.
int* nonzeros_;
int* sumabs_;
size_t num_processed_blocks_[jpegli::kMaxComponents];
float* biases_;
#define SAVED_COEFS 10
// This holds the coef_bits of the scan before the current scan,
// i.e. the bottom half when rendering incomplete scans.
int (*coef_bits_latch)[SAVED_COEFS];
int (*prev_coef_bits_latch)[SAVED_COEFS];
};
#endif // LIB_JPEGLI_DECODE_INTERNAL_H_
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