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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_DEC_MODULAR_H_
#define LIB_JXL_DEC_MODULAR_H_
#include <stddef.h>
#include <string>
#include "lib/jxl/base/data_parallel.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/dec_bit_reader.h"
#include "lib/jxl/dec_cache.h"
#include "lib/jxl/frame_header.h"
#include "lib/jxl/image.h"
#include "lib/jxl/modular/encoding/encoding.h"
#include "lib/jxl/modular/modular_image.h"
namespace jxl {
struct ModularStreamId {
enum Kind {
kGlobalData,
kVarDCTDC,
kModularDC,
kACMetadata,
kQuantTable,
kModularAC
};
Kind kind;
size_t quant_table_id;
size_t group_id; // DC or AC group id.
size_t pass_id; // Only for kModularAC.
size_t ID(const FrameDimensions& frame_dim) const {
size_t id = 0;
switch (kind) {
case kGlobalData:
id = 0;
break;
case kVarDCTDC:
id = 1 + group_id;
break;
case kModularDC:
id = 1 + frame_dim.num_dc_groups + group_id;
break;
case kACMetadata:
id = 1 + 2 * frame_dim.num_dc_groups + group_id;
break;
case kQuantTable:
id = 1 + 3 * frame_dim.num_dc_groups + quant_table_id;
break;
case kModularAC:
id = 1 + 3 * frame_dim.num_dc_groups + DequantMatrices::kNum +
frame_dim.num_groups * pass_id + group_id;
break;
};
return id;
}
static ModularStreamId Global() {
return ModularStreamId{kGlobalData, 0, 0, 0};
}
static ModularStreamId VarDCTDC(size_t group_id) {
return ModularStreamId{kVarDCTDC, 0, group_id, 0};
}
static ModularStreamId ModularDC(size_t group_id) {
return ModularStreamId{kModularDC, 0, group_id, 0};
}
static ModularStreamId ACMetadata(size_t group_id) {
return ModularStreamId{kACMetadata, 0, group_id, 0};
}
static ModularStreamId QuantTable(size_t quant_table_id) {
JXL_ASSERT(quant_table_id < DequantMatrices::kNum);
return ModularStreamId{kQuantTable, quant_table_id, 0, 0};
}
static ModularStreamId ModularAC(size_t group_id, size_t pass_id) {
return ModularStreamId{kModularAC, 0, group_id, pass_id};
}
static size_t Num(const FrameDimensions& frame_dim, size_t passes) {
return ModularAC(0, passes).ID(frame_dim);
}
std::string DebugString() const;
};
class ModularFrameDecoder {
public:
void Init(const FrameDimensions& frame_dim) { this->frame_dim = frame_dim; }
Status DecodeGlobalInfo(BitReader* reader, const FrameHeader& frame_header,
bool allow_truncated_group);
Status DecodeGroup(const Rect& rect, BitReader* reader, int minShift,
int maxShift, const ModularStreamId& stream, bool zerofill,
PassesDecoderState* dec_state,
RenderPipelineInput* render_pipeline_input,
bool allow_truncated, bool* should_run_pipeline = nullptr);
// Decodes a VarDCT DC group (`group_id`) from the given `reader`.
Status DecodeVarDCTDC(size_t group_id, BitReader* reader,
PassesDecoderState* dec_state);
// Decodes a VarDCT AC Metadata group (`group_id`) from the given `reader`.
Status DecodeAcMetadata(size_t group_id, BitReader* reader,
PassesDecoderState* dec_state);
// Decodes a RAW quant table from `br` into the given `encoding`, of size
// `required_size_x x required_size_y`. If `modular_frame_decoder` is passed,
// its global tree is used, otherwise no global tree is used.
static Status DecodeQuantTable(size_t required_size_x, size_t required_size_y,
BitReader* br, QuantEncoding* encoding,
size_t idx,
ModularFrameDecoder* modular_frame_decoder);
// if inplace is true, this can only be called once
// if it is false, it can be called multiple times (e.g. for progressive
// steps)
Status FinalizeDecoding(PassesDecoderState* dec_state, jxl::ThreadPool* pool,
bool inplace);
bool have_dc() const { return have_something; }
void MaybeDropFullImage();
bool UsesFullImage() const { return use_full_image; }
private:
Status ModularImageToDecodedRect(Image& gi, PassesDecoderState* dec_state,
jxl::ThreadPool* pool,
RenderPipelineInput& render_pipeline_input,
Rect modular_rect);
Image full_image;
std::vector<Transform> global_transform;
FrameDimensions frame_dim;
bool do_color;
bool have_something;
bool use_full_image = true;
bool all_same_shift;
Tree tree;
ANSCode code;
std::vector<uint8_t> context_map;
GroupHeader global_header;
};
} // namespace jxl
#endif // LIB_JXL_DEC_MODULAR_H_
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