libjxl

FORK: libjxl patches used on blog
git clone https://git.neptards.moe/blog/libjxl.git
Log | Files | Refs | Submodules | README | LICENSE

epf.h (980B)

      1 // Copyright (c) the JPEG XL Project Authors. All rights reserved.
      2 //
      3 // Use of this source code is governed by a BSD-style
      4 // license that can be found in the LICENSE file.
      5 
      6 #ifndef LIB_JXL_EPF_H_
      7 #define LIB_JXL_EPF_H_
      8 
      9 // Fast SIMD "in-loop" edge preserving filter (adaptive, nonlinear).
     10 
     11 #include "lib/jxl/dec_cache.h"
     12 #include "lib/jxl/image.h"
     13 #include "lib/jxl/loop_filter.h"
     14 
     15 namespace jxl {
     16 
     17 // 4 * (sqrt(0.5)-1), so that Weight(sigma) = 0.5.
     18 static constexpr float kInvSigmaNum = -1.1715728752538099024f;
     19 
     20 // kInvSigmaNum / 0.3
     21 constexpr float kMinSigma = -3.90524291751269967465540850526868f;
     22 
     23 // Fills the `state->filter_weights.sigma` image with the precomputed sigma
     24 // values in the area inside `block_rect`. Accesses the AC strategy, quant field
     25 // and epf_sharpness fields in the corresponding positions.
     26 void ComputeSigma(const LoopFilter& lf, const Rect& block_rect,
     27                   PassesDecoderState* state);
     28 
     29 }  // namespace jxl
     30 
     31 #endif  // LIB_JXL_EPF_H_