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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_AC_STRATEGY_H_
#define LIB_JXL_ENC_AC_STRATEGY_H_
#include <cstddef>
#include "lib/jxl/ac_strategy.h"
#include "lib/jxl/base/compiler_specific.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/chroma_from_luma.h"
#include "lib/jxl/enc_cache.h"
#include "lib/jxl/enc_params.h"
#include "lib/jxl/frame_dimensions.h"
#include "lib/jxl/image.h"
#include "lib/jxl/quant_weights.h"
// `FindBestAcStrategy` uses heuristics to choose which AC strategy should be
// used in each block, as well as the initial quantization field.
namespace jxl {
struct AuxOut;
// AC strategy selection: utility struct.
struct ACSConfig {
const DequantMatrices* JXL_RESTRICT dequant;
const float* JXL_RESTRICT quant_field_row;
size_t quant_field_stride;
const float* JXL_RESTRICT masking_field_row;
size_t masking_field_stride;
const float* JXL_RESTRICT masking1x1_field_row;
size_t masking1x1_field_stride;
const float* JXL_RESTRICT src_rows[3];
size_t src_stride;
float info_loss_multiplier;
float cost_delta;
float zeros_mul;
const float& Pixel(size_t c, size_t x, size_t y) const {
return src_rows[c][y * src_stride + x];
}
float Masking(size_t bx, size_t by) const {
JXL_DASSERT(masking_field_row[by * masking_field_stride + bx] > 0);
return masking_field_row[by * masking_field_stride + bx];
}
const float* MaskingPtr1x1(size_t bx, size_t by) const {
JXL_DASSERT(masking1x1_field_row[by * masking1x1_field_stride + bx] > 0);
return &masking1x1_field_row[by * masking1x1_field_stride + bx];
}
float Quant(size_t bx, size_t by) const {
JXL_DASSERT(quant_field_row[by * quant_field_stride + bx] > 0);
return quant_field_row[by * quant_field_stride + bx];
}
};
struct AcStrategyHeuristics {
explicit AcStrategyHeuristics(const CompressParams& cparams)
: cparams(cparams), mem_per_thread(0), qmem_per_thread(0) {}
void Init(const Image3F& src, const Rect& rect_in, const ImageF& quant_field,
const ImageF& mask, const ImageF& mask1x1,
DequantMatrices* matrices);
void PrepareForThreads(std::size_t num_threads);
void ProcessRect(const Rect& rect, const ColorCorrelationMap& cmap,
AcStrategyImage* ac_strategy, size_t thread);
Status Finalize(const FrameDimensions& frame_dim,
const AcStrategyImage& ac_strategy, AuxOut* aux_out);
const CompressParams& cparams;
ACSConfig config = {};
size_t mem_per_thread;
hwy::AlignedFreeUniquePtr<float[]> mem;
size_t qmem_per_thread;
hwy::AlignedFreeUniquePtr<uint32_t[]> qmem;
};
} // namespace jxl
#endif // LIB_JXL_ENC_AC_STRATEGY_H_
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