From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:32:43 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- third_party/jpeg-xl/lib/jxl/enc_ans_params.h | 76 ++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 third_party/jpeg-xl/lib/jxl/enc_ans_params.h (limited to 'third_party/jpeg-xl/lib/jxl/enc_ans_params.h') diff --git a/third_party/jpeg-xl/lib/jxl/enc_ans_params.h b/third_party/jpeg-xl/lib/jxl/enc_ans_params.h new file mode 100644 index 0000000000..50ca31dc03 --- /dev/null +++ b/third_party/jpeg-xl/lib/jxl/enc_ans_params.h @@ -0,0 +1,76 @@ +// 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_ANS_PARAMS_H_ +#define LIB_JXL_ENC_ANS_PARAMS_H_ + +// Encoder-only parameter needed for ANS entropy encoding methods. + +#include +#include + +#include "lib/jxl/enc_params.h" + +namespace jxl { + +struct HistogramParams { + enum class ClusteringType { + kFastest, // Only 4 clusters. + kFast, + kBest, + }; + + enum class HybridUintMethod { + kNone, // just use kHybridUint420Config. + k000, // force the fastest option. + kFast, // just try a couple of options. + kContextMap, // fast choice for ctx map. + kBest, + }; + + enum class LZ77Method { + kNone, // do not try lz77. + kRLE, // only try doing RLE. + kLZ77, // try lz77 with backward references. + kOptimal, // optimal-matching LZ77 parsing. + }; + + enum class ANSHistogramStrategy { + kFast, // Only try some methods, early exit. + kApproximate, // Only try some methods. + kPrecise, // Try all methods. + }; + + HistogramParams() = default; + + HistogramParams(SpeedTier tier, size_t num_ctx) { + if (tier > SpeedTier::kFalcon) { + clustering = ClusteringType::kFastest; + lz77_method = LZ77Method::kNone; + } else if (tier > SpeedTier::kTortoise) { + clustering = ClusteringType::kFast; + } else { + clustering = ClusteringType::kBest; + } + if (tier > SpeedTier::kTortoise) { + uint_method = HybridUintMethod::kNone; + } + if (tier >= SpeedTier::kSquirrel) { + ans_histogram_strategy = ANSHistogramStrategy::kApproximate; + } + } + + ClusteringType clustering = ClusteringType::kBest; + HybridUintMethod uint_method = HybridUintMethod::kBest; + LZ77Method lz77_method = LZ77Method::kRLE; + ANSHistogramStrategy ans_histogram_strategy = ANSHistogramStrategy::kPrecise; + std::vector image_widths; + size_t max_histograms = ~0; + bool force_huffman = false; +}; + +} // namespace jxl + +#endif // LIB_JXL_ENC_ANS_PARAMS_H_ -- cgit v1.2.3