// 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_DEC_FILE_H_
#define LIB_JXL_DEC_FILE_H_

// Top-level interface for JXL decoding.

#include <stdint.h>

#include "lib/jxl/base/data_parallel.h"
#include "lib/jxl/base/padded_bytes.h"
#include "lib/jxl/base/span.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/codec_in_out.h"
#include "lib/jxl/dec_params.h"

namespace jxl {

// Decodes the preview image, if present, and stores it in `preview`.
// Must be the first frame in the file. Does nothing if there is no preview
// frame present according to the metadata.
Status DecodePreview(const DecompressParams& dparams,
                     const CodecMetadata& metadata,
                     BitReader* JXL_RESTRICT reader, ThreadPool* pool,
                     ImageBundle* JXL_RESTRICT preview, uint64_t* dec_pixels,
                     const SizeConstraints* constraints);

// Implementation detail: currently decodes to linear sRGB. The contract is:
// `io` appears 'identical' (modulo compression artifacts) to the encoder input
// in a color-aware viewer. Note that `io->metadata.m.color_encoding`
// identifies the color space that was passed to the encoder; clients that want
// that same encoding must call `io->TransformTo` afterwards.
Status DecodeFile(const DecompressParams& params,
                  const Span<const uint8_t> file, CodecInOut* io,
                  ThreadPool* pool = nullptr);

static inline Status DecodeFile(const DecompressParams& params,
                                const PaddedBytes& file, CodecInOut* io,
                                ThreadPool* pool = nullptr) {
  return DecodeFile(params, Span<const uint8_t>(file), io, pool);
}

}  // namespace jxl

#endif  // LIB_JXL_DEC_FILE_H_