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diff --git a/lib/jpegli/test_params.h b/lib/jpegli/test_params.h
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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_JPEGLI_TEST_PARAMS_H_
+#define LIB_JPEGLI_TEST_PARAMS_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <algorithm>
+#include <vector>
+
+#include "lib/jpegli/types.h"
+
+namespace jpegli {
+
+// We define this here as well to make sure that the *_api_test.cc tests only
+// use the public API and therefore we don't include any *_internal.h headers.
+template <typename T1, typename T2>
+constexpr inline T1 DivCeil(T1 a, T2 b) {
+  return (a + b - 1) / b;
+}
+
+#define ARRAY_SIZE(X) (sizeof(X) / sizeof((X)[0]))
+
+static constexpr int kLastScan = 0xffff;
+
+static uint32_t kTestColorMap[] = {
+    0x000000, 0xff0000, 0x00ff00, 0x0000ff, 0xffff00, 0x00ffff,
+    0xff00ff, 0xffffff, 0x6251fc, 0x45d9c7, 0xa7f059, 0xd9a945,
+    0xfa4e44, 0xceaffc, 0xbad7db, 0xc1f0b1, 0xdbca9a, 0xfacac5,
+    0xf201ff, 0x0063db, 0x00f01c, 0xdbb204, 0xf12f0c, 0x7ba1dc};
+static constexpr int kTestColorMapNumColors = ARRAY_SIZE(kTestColorMap);
+
+static constexpr int kSpecialMarker0 = 0xe5;
+static constexpr int kSpecialMarker1 = 0xe9;
+static constexpr uint8_t kMarkerData[] = {0, 1, 255, 0, 17};
+static constexpr uint8_t kMarkerSequence[] = {0xe6, 0xe8, 0xe7,
+                                              0xe6, 0xe7, 0xe8};
+static constexpr size_t kMarkerSequenceLen = ARRAY_SIZE(kMarkerSequence);
+
+enum JpegIOMode {
+  PIXELS,
+  RAW_DATA,
+  COEFFICIENTS,
+};
+
+struct CustomQuantTable {
+  int slot_idx = 0;
+  uint16_t table_type = 0;
+  int scale_factor = 100;
+  bool add_raw = false;
+  bool force_baseline = true;
+  std::vector<unsigned int> basic_table;
+  std::vector<unsigned int> quantval;
+  void Generate();
+};
+
+struct TestImage {
+  size_t xsize = 2268;
+  size_t ysize = 1512;
+  int color_space = 2;  // JCS_RGB
+  size_t components = 3;
+  JpegliDataType data_type = JPEGLI_TYPE_UINT8;
+  JpegliEndianness endianness = JPEGLI_NATIVE_ENDIAN;
+  std::vector<uint8_t> pixels;
+  std::vector<std::vector<uint8_t>> raw_data;
+  std::vector<std::vector<int16_t>> coeffs;
+  void AllocatePixels() {
+    pixels.resize(ysize * xsize * components *
+                  jpegli_bytes_per_sample(data_type));
+  }
+  void Clear() {
+    pixels.clear();
+    raw_data.clear();
+    coeffs.clear();
+  }
+};
+
+struct CompressParams {
+  int quality = 90;
+  bool set_jpeg_colorspace = false;
+  int jpeg_color_space = 0;  // JCS_UNKNOWN
+  std::vector<int> quant_indexes;
+  std::vector<CustomQuantTable> quant_tables;
+  std::vector<int> h_sampling;
+  std::vector<int> v_sampling;
+  std::vector<int> comp_ids;
+  int override_JFIF = -1;
+  int override_Adobe = -1;
+  bool add_marker = false;
+  bool simple_progression = false;
+  // -1 is library default
+  // 0, 1, 2 is set through jpegli_set_progressive_level()
+  // 2 + N is kScriptN
+  int progressive_mode = -1;
+  unsigned int restart_interval = 0;
+  int restart_in_rows = 0;
+  int smoothing_factor = 0;
+  int optimize_coding = -1;
+  bool use_flat_dc_luma_code = false;
+  bool omit_standard_tables = false;
+  bool xyb_mode = false;
+  bool libjpeg_mode = false;
+  bool use_adaptive_quantization = true;
+  std::vector<uint8_t> icc;
+
+  int h_samp(int c) const { return h_sampling.empty() ? 1 : h_sampling[c]; }
+  int v_samp(int c) const { return v_sampling.empty() ? 1 : v_sampling[c]; }
+  int max_h_sample() const {
+    auto it = std::max_element(h_sampling.begin(), h_sampling.end());
+    return it == h_sampling.end() ? 1 : *it;
+  }
+  int max_v_sample() const {
+    auto it = std::max_element(v_sampling.begin(), v_sampling.end());
+    return it == v_sampling.end() ? 1 : *it;
+  }
+  int comp_width(const TestImage& input, int c) const {
+    return DivCeil(input.xsize * h_samp(c), max_h_sample() * 8) * 8;
+  }
+  int comp_height(const TestImage& input, int c) const {
+    return DivCeil(input.ysize * v_samp(c), max_v_sample() * 8) * 8;
+  }
+};
+
+enum ColorQuantMode {
+  CQUANT_1PASS,
+  CQUANT_2PASS,
+  CQUANT_EXTERNAL,
+  CQUANT_REUSE,
+};
+
+struct ScanDecompressParams {
+  int max_scan_number;
+  int dither_mode;
+  ColorQuantMode color_quant_mode;
+};
+
+struct DecompressParams {
+  float size_factor = 1.0f;
+  size_t chunk_size = 65536;
+  size_t max_output_lines = 16;
+  JpegIOMode output_mode = PIXELS;
+  JpegliDataType data_type = JPEGLI_TYPE_UINT8;
+  JpegliEndianness endianness = JPEGLI_NATIVE_ENDIAN;
+  bool set_out_color_space = false;
+  int out_color_space = 0;  // JCS_UNKNOWN
+  bool crop_output = false;
+  bool do_block_smoothing = false;
+  bool do_fancy_upsampling = true;
+  bool skip_scans = false;
+  int scale_num = 1;
+  int scale_denom = 1;
+  bool quantize_colors = false;
+  int desired_number_of_colors = 256;
+  std::vector<ScanDecompressParams> scan_params;
+};
+
+}  // namespace jpegli
+
+#endif  // LIB_JPEGLI_TEST_PARAMS_H_