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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_PARAMS_H_
+#define LIB_JXL_ENC_PARAMS_H_
+
+// Parameters and flags that govern JXL compression.
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <string>
+
+#include "lib/jxl/base/override.h"
+#include "lib/jxl/butteraugli/butteraugli.h"
+#include "lib/jxl/frame_header.h"
+#include "lib/jxl/modular/options.h"
+#include "lib/jxl/modular/transform/transform.h"
+
+namespace jxl {
+
+enum class SpeedTier {
+  // Try multiple combinations of Tortoise flags for modular mode. Otherwise
+  // like kTortoise.
+  kGlacier = 0,
+  // Turns on FindBestQuantizationHQ loop. Equivalent to "guetzli" mode.
+  kTortoise = 1,
+  // Turns on FindBestQuantization butteraugli loop.
+  kKitten = 2,
+  // Turns on dots, patches, and spline detection by default, as well as full
+  // context clustering. Default.
+  kSquirrel = 3,
+  // Turns on error diffusion and full AC strategy heuristics. Equivalent to
+  // "fast" mode.
+  kWombat = 4,
+  // Turns on gaborish by default, non-default cmap, initial quant field.
+  kHare = 5,
+  // Turns on simple heuristics for AC strategy, quant field, and clustering;
+  // also enables coefficient reordering.
+  kCheetah = 6,
+  // Turns off most encoder features. Does context clustering.
+  // Modular: uses fixed tree with Weighted predictor.
+  kFalcon = 7,
+  // Currently fastest possible setting for VarDCT.
+  // Modular: uses fixed tree with Gradient predictor.
+  kThunder = 8,
+  // VarDCT: same as kThunder.
+  // Modular: no tree, Gradient predictor, fast histograms
+  kLightning = 9
+};
+
+// NOLINTNEXTLINE(clang-analyzer-optin.performance.Padding)
+struct CompressParams {
+  float butteraugli_distance = 1.0f;
+
+  // explicit distances for extra channels (defaults to butteraugli_distance
+  // when not set; value of -1 can be used to represent 'default')
+  std::vector<float> ec_distance;
+  size_t target_size = 0;
+  float target_bitrate = 0.0f;
+
+  // 0.0 means search for the adaptive quantization map that matches the
+  // butteraugli distance, positive values mean quantize everywhere with that
+  // value.
+  float uniform_quant = 0.0f;
+  float quant_border_bias = 0.0f;
+
+  // Try to achieve a maximum pixel-by-pixel error on each channel.
+  bool max_error_mode = false;
+  float max_error[3] = {0.0, 0.0, 0.0};
+
+  SpeedTier speed_tier = SpeedTier::kSquirrel;
+  int brotli_effort = -1;
+
+  // 0 = default.
+  // 1 = slightly worse quality.
+  // 4 = fastest speed, lowest quality
+  size_t decoding_speed_tier = 0;
+
+  int max_butteraugli_iters = 4;
+
+  int max_butteraugli_iters_guetzli_mode = 100;
+
+  ColorTransform color_transform = ColorTransform::kXYB;
+  YCbCrChromaSubsampling chroma_subsampling;
+
+  // If true, the "modular mode options" members below are used.
+  bool modular_mode = false;
+
+  // Change group size in modular mode (0=128, 1=256, 2=512, 3=1024).
+  size_t modular_group_size_shift = 1;
+
+  Override preview = Override::kDefault;
+  Override noise = Override::kDefault;
+  Override dots = Override::kDefault;
+  Override patches = Override::kDefault;
+  Override gaborish = Override::kDefault;
+  int epf = -1;
+
+  // Progressive mode.
+  bool progressive_mode = false;
+
+  // Quantized-progressive mode.
+  bool qprogressive_mode = false;
+
+  // Put center groups first in the bitstream.
+  bool centerfirst = false;
+
+  // Pixel coordinates of the center. First group will contain that center.
+  size_t center_x = static_cast<size_t>(-1);
+  size_t center_y = static_cast<size_t>(-1);
+
+  int progressive_dc = -1;
+
+  // If on: preserve color of invisible pixels (if off: don't care)
+  // Default: on for lossless, off for lossy
+  Override keep_invisible = Override::kDefault;
+
+  // Currently unused as of 2020-01.
+  bool clear_metadata = false;
+
+  // Prints extra information during/after encoding.
+  bool verbose = false;
+  bool log_search_state = false;
+
+  ButteraugliParams ba_params;
+
+  // Force usage of CfL when doing JPEG recompression. This can have unexpected
+  // effects on the decoded pixels, while still being JPEG-compliant and
+  // allowing reconstruction of the original JPEG.
+  bool force_cfl_jpeg_recompression = true;
+
+  // Use brotli compression for any boxes derived from a JPEG frame.
+  bool jpeg_compress_boxes = true;
+
+  // Set the noise to what it would approximately be if shooting at the nominal
+  // exposure for a given ISO setting on a 35mm camera.
+  float photon_noise_iso = 0;
+
+  // modular mode options below
+  ModularOptions options;
+  int responsive = -1;
+  // empty for default squeeze
+  std::vector<SqueezeParams> squeezes;
+  int colorspace = -1;
+  // Use Global channel palette if #colors < this percentage of range
+  float channel_colors_pre_transform_percent = 95.f;
+  // Use Local channel palette if #colors < this percentage of range
+  float channel_colors_percent = 80.f;
+  int palette_colors = 1 << 10;  // up to 10-bit palette is probably worthwhile
+  bool lossy_palette = false;
+
+  // Returns whether these params are lossless as defined by SetLossless();
+  bool IsLossless() const { return modular_mode && ModularPartIsLossless(); }
+
+  bool ModularPartIsLossless() const {
+    if (modular_mode) {
+      // YCbCr is also considered lossless here since it's intended for
+      // source material that is already YCbCr (we don't do the fwd transform)
+      if (butteraugli_distance != 0 ||
+          color_transform == jxl::ColorTransform::kXYB)
+        return false;
+    }
+    for (float f : ec_distance) {
+      if (f > 0) return false;
+      if (f < 0 && butteraugli_distance != 0) return false;
+    }
+    // if no explicit ec_distance given, and using vardct, then the modular part
+    // is empty or not lossless
+    if (!modular_mode && ec_distance.empty()) return false;
+    // all modular channels are encoded at distance 0
+    return true;
+  }
+
+  // Sets the parameters required to make the codec lossless.
+  void SetLossless() {
+    modular_mode = true;
+    butteraugli_distance = 0.0f;
+    for (float &f : ec_distance) f = 0.0f;
+    color_transform = jxl::ColorTransform::kNone;
+  }
+
+  // Down/upsample the image before encoding / after decoding by this factor.
+  // The resampling value can also be set to <= 0 to automatically choose based
+  // on distance, however EncodeFrame doesn't support this, so it is
+  // required to call PostInit() to set a valid positive resampling
+  // value and altered butteraugli score if this is used.
+  int resampling = -1;
+  int ec_resampling = -1;
+  // Skip the downsampling before encoding if this is true.
+  bool already_downsampled = false;
+  // Butteraugli target distance on the original full size image, this can be
+  // different from butteraugli_distance if resampling was used.
+  float original_butteraugli_distance = -1.0f;
+
+  float quant_ac_rescale = 1.0;
+
+  // Codestream level to conform to.
+  // -1: don't care
+  int level = -1;
+
+  std::vector<float> manual_noise;
+  std::vector<float> manual_xyb_factors;
+};
+
+static constexpr float kMinButteraugliForDynamicAR = 0.5f;
+static constexpr float kMinButteraugliForDots = 3.0f;
+static constexpr float kMinButteraugliToSubtractOriginalPatches = 3.0f;
+
+// Always off
+static constexpr float kMinButteraugliForNoise = 99.0f;
+
+// Minimum butteraugli distance the encoder accepts.
+static constexpr float kMinButteraugliDistance = 0.001f;
+
+// Tile size for encoder-side processing. Must be equal to color tile dim in the
+// current implementation.
+static constexpr size_t kEncTileDim = 64;
+static constexpr size_t kEncTileDimInBlocks = kEncTileDim / kBlockDim;
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_ENC_PARAMS_H_