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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 <cstddef>
#include <hwy/aligned_allocator.h>
#include "lib/jxl/ac_strategy.h"
#include "lib/jxl/chroma_from_luma.h"
#include "lib/jxl/enc_bit_writer.h"
#include "lib/jxl/image.h"
#include "lib/jxl/quant_weights.h"
#include "lib/jxl/simd_util.h"
namespace jxl {
struct AuxOut;
class Quantizer;
void ColorCorrelationMapEncodeDC(const ColorCorrelationMap& map,
BitWriter* writer, size_t layer,
AuxOut* aux_out);
struct CfLHeuristics {
Status Init(const Rect& rect);
void PrepareForThreads(size_t num_threads) {
mem = hwy::AllocateAligned<float>(num_threads * ItemsPerThread());
}
void 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);
ImageF dc_values;
hwy::AlignedFreeUniquePtr<float[]> 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_
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