enc_chroma_from_luma.h

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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_ENC_CHROMA_FROM_LUMA_H_

#define LIB_JXL_ENC_CHROMA_FROM_LUMA_H_

// Chroma-from-luma, computed using heuristics to determine the best linear

// model for the X and B channels from the Y channel.

#include <jxl/memory_manager.h>

#include <cstddef>

#include <cstdint>

#include "lib/jxl/ac_strategy.h"

#include "lib/jxl/base/rect.h"

#include "lib/jxl/base/status.h"

#include "lib/jxl/chroma_from_luma.h"

#include "lib/jxl/enc_bit_writer.h"

#include "lib/jxl/image.h"

#include "lib/jxl/memory_manager_internal.h"

#include "lib/jxl/quant_weights.h"

#include "lib/jxl/simd_util.h"

namespace jxl {

struct AuxOut;

enum class LayerType : uint8_t;

class Quantizer;

Status ColorCorrelationEncodeDC(const ColorCorrelation& color_correlation,

                                BitWriter* writer, LayerType layer,

                                AuxOut* aux_out);

struct CfLHeuristics {

  explicit CfLHeuristics(JxlMemoryManager* memory_manager)

      : memory_manager(memory_manager) {}

  Status Init(const Rect& rect);

  Status PrepareForThreads(size_t num_threads) {

    size_t mem_bytes = num_threads * ItemsPerThread() * sizeof(float);

    JXL_ASSIGN_OR_RETURN(mem, AlignedMemory::Create(memory_manager, mem_bytes));

    return true;

  Status ComputeTile(const Rect& r, const Image3F& opsin,

                     const Rect& opsin_rect, const DequantMatrices& dequant,

                     const AcStrategyImage* ac_strategy,

                     const ImageI* raw_quant_field, const Quantizer* quantizer,

                     bool fast, size_t thread, ColorCorrelationMap* cmap);

  JxlMemoryManager* memory_manager;

  ImageF dc_values;

  AlignedMemory mem;

  // Working set is too large for stack; allocate dynamically.

  static size_t ItemsPerThread() {

    const size_t dct_scratch_size =

        3 * (MaxVectorSize() / sizeof(float)) * AcStrategy::kMaxBlockDim;

    return AcStrategy::kMaxCoeffArea * 3        // Blocks

           + kColorTileDim * kColorTileDim * 4  // AC coeff storage

           + AcStrategy::kMaxCoeffArea * 2      // Scratch space

           + dct_scratch_size;

};

}  // namespace jxl

#endif  // LIB_JXL_ENC_CHROMA_FROM_LUMA_H_