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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_EPF_H_
#define LIB_JXL_EPF_H_
// Fast SIMD "in-loop" edge preserving filter (adaptive, nonlinear).
#include <stddef.h>
#include "lib/jxl/base/data_parallel.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/dec_cache.h"
#include "lib/jxl/passes_state.h"
namespace jxl {
// 4 * (sqrt(0.5)-1), so that Weight(sigma) = 0.5.
static constexpr float kInvSigmaNum = -1.1715728752538099024f;
// kInvSigmaNum / 0.3
constexpr float kMinSigma = -3.90524291751269967465540850526868f;
// Fills the `state->filter_weights.sigma` image with the precomputed sigma
// values in the area inside `block_rect`. Accesses the AC strategy, quant field
// and epf_sharpness fields in the corresponding positions.
void ComputeSigma(const Rect& block_rect, PassesDecoderState* state);
} // namespace jxl
#endif // LIB_JXL_EPF_H_
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