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diff --git a/third_party/jpeg-xl/lib/jpegli/encode_internal.h b/third_party/jpeg-xl/lib/jpegli/encode_internal.h
new file mode 100644
index 0000000000..8f08272fd2
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+++ b/third_party/jpeg-xl/lib/jpegli/encode_internal.h
@@ -0,0 +1,101 @@
+// 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_ENCODE_INTERNAL_H_
+#define LIB_JPEGLI_ENCODE_INTERNAL_H_
+
+/* clang-format off */
+#include <stdint.h>
+#include <stdio.h>
+#include <jpeglib.h>
+/* clang-format on */
+
+#include "lib/jpegli/bit_writer.h"
+#include "lib/jpegli/common_internal.h"
+#include "lib/jpegli/encode.h"
+
+namespace jpegli {
+
+constexpr unsigned char kICCSignature[12] = {
+    0x49, 0x43, 0x43, 0x5F, 0x50, 0x52, 0x4F, 0x46, 0x49, 0x4C, 0x45, 0x00};
+constexpr int kICCMarker = JPEG_APP0 + 2;
+
+struct JPEGHuffmanCode {
+  // Bit length histogram.
+  uint32_t counts[kJpegHuffmanMaxBitLength + 1];
+  // Symbol values sorted by increasing bit lengths.
+  uint32_t values[kJpegHuffmanAlphabetSize + 1];
+  // The index of the Huffman code in the current set of Huffman codes. For AC
+  // component Huffman codes, 0x10 is added to the index.
+  int slot_id;
+  boolean sent_table;
+};
+
+// DCTCodingState: maximum number of correction bits to buffer
+const int kJPEGMaxCorrectionBits = 1u << 16;
+
+constexpr int kDefaultProgressiveLevel = 0;
+
+struct HuffmanCodeTable {
+  int depth[256];
+  int code[256];
+};
+
+struct ScanCodingInfo {
+  uint32_t dc_tbl_idx[MAX_COMPS_IN_SCAN];
+  uint32_t ac_tbl_idx[MAX_COMPS_IN_SCAN];
+  // Number of Huffman codes defined in the DHT segment preceding this scan.
+  size_t num_huffman_codes;
+};
+
+typedef int16_t coeff_t;
+
+}  // namespace jpegli
+
+struct jpeg_comp_master {
+  jpegli::RowBuffer<float> input_buffer[jpegli::kMaxComponents];
+  jpegli::RowBuffer<float>* smooth_input[jpegli::kMaxComponents];
+  jpegli::RowBuffer<float>* raw_data[jpegli::kMaxComponents];
+  bool force_baseline;
+  bool xyb_mode;
+  uint8_t cicp_transfer_function;
+  bool use_std_tables;
+  bool use_adaptive_quantization;
+  int progressive_level;
+  size_t xsize_blocks;
+  size_t ysize_blocks;
+  size_t blocks_per_iMCU_row;
+  jpegli::ScanCodingInfo* scan_coding_info;
+  JpegliDataType data_type;
+  JpegliEndianness endianness;
+  void (*input_method)(const uint8_t* row_in, size_t len,
+                       float* row_out[jpegli::kMaxComponents]);
+  void (*color_transform)(float* row[jpegli::kMaxComponents], size_t len);
+  void (*downsample_method[jpegli::kMaxComponents])(
+      float* rows_in[MAX_SAMP_FACTOR], size_t len, float* row_out);
+  float* quant_mul[jpegli::kMaxComponents];
+  float* zero_bias_offset[jpegli::kMaxComponents];
+  float* zero_bias_mul[jpegli::kMaxComponents];
+  int h_factor[jpegli::kMaxComponents];
+  int v_factor[jpegli::kMaxComponents];
+  jpegli::JPEGHuffmanCode* huffman_codes;
+  size_t num_huffman_codes;
+  jpegli::HuffmanCodeTable huff_tables[8];
+  float* diff_buffer;
+  jpegli::RowBuffer<float> fuzzy_erosion_tmp;
+  jpegli::RowBuffer<float> pre_erosion;
+  jpegli::RowBuffer<float> quant_field;
+  jvirt_barray_ptr* coeff_buffers;
+  size_t next_input_row;
+  size_t next_iMCU_row;
+  size_t last_dht_index;
+  size_t last_restart_interval;
+  JCOEF last_dc_coeff[MAX_COMPS_IN_SCAN];
+  jpegli::JpegBitWriter bw;
+  float* dct_buffer;
+  int32_t* block_tmp;
+};
+
+#endif  // LIB_JPEGLI_ENCODE_INTERNAL_H_