pnm.h - mozsearch

Enable keyboard shortcuts

// 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_EXTRAS_DEC_PNM_H_

#define LIB_EXTRAS_DEC_PNM_H_

// Decodes PBM/PGM/PPM/PFM pixels in memory.

#include <stddef.h>

#include <stdint.h>

// TODO(janwas): workaround for incorrect Win64 codegen (cause unknown)

#include <hwy/highway.h>

#include "lib/extras/dec/color_hints.h"

#include "lib/extras/mmap.h"

#include "lib/extras/packed_image.h"

#include "lib/jxl/base/span.h"

#include "lib/jxl/base/status.h"

namespace jxl {

struct SizeConstraints;

namespace extras {

// Decodes `bytes` into `ppf`. color_hints may specify "color_space", which

// defaults to sRGB.

Status DecodeImagePNM(Span<const uint8_t> bytes, const ColorHints& color_hints,

                      PackedPixelFile* ppf,

                      const SizeConstraints* constraints = nullptr);

struct HeaderPNM {

  size_t xsize;

  size_t ysize;

  bool is_gray;    // PGM

  bool has_alpha;  // PAM

  size_t bits_per_sample;

  bool floating_point;

  bool big_endian;

  std::vector<JxlExtraChannelType> ec_types;  // PAM

};

class ChunkedPNMDecoder {

 public:

  static StatusOr<ChunkedPNMDecoder> Init(const char* file_path);

  // Initializes `ppf` with a pointer to this `ChunkedPNMDecoder`.

  jxl::Status InitializePPF(const ColorHints& color_hints,

                            PackedPixelFile* ppf);

 private:

  HeaderPNM header_ = {};

  size_t data_start_ = 0;

  MemoryMappedFile pnm_;

  friend struct PNMChunkedInputFrame;

};

}  // namespace extras

}  // namespace jxl

#endif  // LIB_EXTRAS_DEC_PNM_H_