31 lines
984 B
C++
31 lines
984 B
C++
// Copyright (c) the JPEG XL Project Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#ifndef LIB_JXL_EPF_H_
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#define LIB_JXL_EPF_H_
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// Fast SIMD "in-loop" edge preserving filter (adaptive, nonlinear).
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#include "lib/jxl/base/rect.h"
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#include "lib/jxl/dec_cache.h"
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#include "lib/jxl/loop_filter.h"
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namespace jxl {
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// 4 * (sqrt(0.5)-1), so that Weight(sigma) = 0.5.
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static constexpr float kInvSigmaNum = -1.1715728752538099024f;
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// kInvSigmaNum / 0.3
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constexpr float kMinSigma = -3.90524291751269967465540850526868f;
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// Fills the `state->filter_weights.sigma` image with the precomputed sigma
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// values in the area inside `block_rect`. Accesses the AC strategy, quant field
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// and epf_sharpness fields in the corresponding positions.
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void ComputeSigma(const LoopFilter& lf, const Rect& block_rect,
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PassesDecoderState* state);
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} // namespace jxl
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#endif // LIB_JXL_EPF_H_
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