// 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.

#include "lib/jxl/image_metadata.h"

#include <limits>

#include <utility>

#include "lib/jxl/alpha.h"

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

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

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

#include "lib/jxl/codec_in_out.h"

#include "lib/jxl/color_management.h"

#include "lib/jxl/fields.h"

namespace jxl {

BitDepth::BitDepth() { Bundle::Init(this); }

Status BitDepth::VisitFields(Visitor* JXL_RESTRICT visitor) {

  JXL_QUIET_RETURN_IF_ERROR(visitor->Bool(false, &floating_point_sample));

  // The same fields (bits_per_sample and exponent_bits_per_sample) are read

  // in a different way depending on floating_point_sample's value. It's still

  // default-initialized correctly so using visitor->Conditional is not

  // required.

  if (!floating_point_sample) {

    JXL_QUIET_RETURN_IF_ERROR(visitor->U32(

        Val(8), Val(10), Val(12), BitsOffset(6, 1), 8, &bits_per_sample));

    exponent_bits_per_sample = 0;

  } else {

    JXL_QUIET_RETURN_IF_ERROR(visitor->U32(

        Val(32), Val(16), Val(24), BitsOffset(6, 1), 32, &bits_per_sample));

    // The encoded value is exponent_bits_per_sample - 1, encoded in 3 bits

    // so the value can be in range [1, 8].

    const uint32_t offset = 1;

    exponent_bits_per_sample -= offset;

    JXL_QUIET_RETURN_IF_ERROR(

        visitor->Bits(4, 8 - offset, &exponent_bits_per_sample));

    exponent_bits_per_sample += offset;

  }

  // Error-checking for floating point ranges.

  if (floating_point_sample) {

    if (exponent_bits_per_sample < 2 || exponent_bits_per_sample > 8) {

      return JXL_FAILURE("Invalid exponent_bits_per_sample: %u",

                         exponent_bits_per_sample);

    }

    int mantissa_bits =

        static_cast<int>(bits_per_sample) - exponent_bits_per_sample - 1;

    if (mantissa_bits < 2 || mantissa_bits > 23) {

      return JXL_FAILURE("Invalid bits_per_sample: %u", bits_per_sample);

    }

  } else {

    if (bits_per_sample > 31) {

      return JXL_FAILURE("Invalid bits_per_sample: %u", bits_per_sample);

    }

  }

  return true;

}

std::string BitDepth::DebugString() const {

  std::ostringstream os;

  os << (floating_point_sample ? "F" : "U");

  os << bits_per_sample;

  if (floating_point_sample) os << "." << exponent_bits_per_sample;

  return os.str();

}

CustomTransformData::CustomTransformData() { Bundle::Init(this); }

Status CustomTransformData::VisitFields(Visitor* JXL_RESTRICT visitor) {

  if (visitor->AllDefault(*this, &all_default)) {

    // Overwrite all serialized fields, but not any nonserialized_*.

    visitor->SetDefault(this);

    return true;

  }

  if (visitor->Conditional(nonserialized_xyb_encoded)) {

    JXL_QUIET_RETURN_IF_ERROR(visitor->VisitNested(&opsin_inverse_matrix));

  }

  JXL_QUIET_RETURN_IF_ERROR(visitor->Bits(3, 0, &custom_weights_mask));

  if (visitor->Conditional((custom_weights_mask & 0x1) != 0)) {

    // 4 5x5 kernels, but all of them can be obtained by symmetry from one,

    // which is symmetric along its main diagonal. The top-left kernel is

    // defined by

    //

    // 0  1  2  3  4

    // 1  5  6  7  8

    // 2  6  9 10 11

    // 3  7 10 12 13

    // 4  8 11 13 14

    float constexpr kWeights2[15] = {

        -0.01716200f, -0.03452303f, -0.04022174f, -0.02921014f, -0.00624645f,

        0.14111091f,  0.28896755f,  0.00278718f,  -0.01610267f, 0.56661550f,

        0.03777607f,  -0.01986694f, -0.03144731f, -0.01185068f, -0.00213539f};

    for (size_t i = 0; i < 15; i++) {

      JXL_QUIET_RETURN_IF_ERROR(

          visitor->F16(kWeights2[i], &upsampling2_weights[i]));

    }

  }

  if (visitor->Conditional((custom_weights_mask & 0x2) != 0)) {

    // 16 5x5 kernels, but all of them can be obtained by symmetry from

    // three, two of which are symmetric along their main diagonals. The top

    // left 4 kernels are defined by

    //

    // 0  1  2  3  4   5  6  7  8  9

    // 1 10 11 12 13  14 15 16 17 18

    // 2 11 19 20 21  22 23 24 25 26

    // 3 12 20 27 28  29 30 31 32 33

    // 4 13 21 28 34  35 36 37 38 39

    //

    // 5 14 22 29 35  40 41 42 43 44

    // 6 15 23 30 36  41 45 46 47 48

    // 7 16 24 31 37  42 46 49 50 51

    // 8 17 25 32 38  43 47 50 52 53

    // 9 18 26 33 39  44 48 51 53 54

    constexpr float kWeights4[55] = {

        -0.02419067f, -0.03491987f, -0.03693351f, -0.03094285f, -0.00529785f,

        -0.01663432f, -0.03556863f, -0.03888905f, -0.03516850f, -0.00989469f,

        0.23651958f,  0.33392945f,  -0.01073543f, -0.01313181f, -0.03556694f,

        0.13048175f,  0.40103025f,  0.03951150f,  -0.02077584f, 0.46914198f,

        -0.00209270f, -0.01484589f, -0.04064806f, 0.18942530f,  0.56279892f,

        0.06674400f,  -0.02335494f, -0.03551682f, -0.00754830f, -0.02267919f,

        -0.02363578f, 0.00315804f,  -0.03399098f, -0.01359519f, -0.00091653f,

        -0.00335467f, -0.01163294f, -0.01610294f, -0.00974088f, -0.00191622f,

        -0.01095446f, -0.03198464f, -0.04455121f, -0.02799790f, -0.00645912f,

        0.06390599f,  0.22963888f,  0.00630981f,  -0.01897349f, 0.67537268f,

        0.08483369f,  -0.02534994f, -0.02205197f, -0.01667999f, -0.00384443f};

    for (size_t i = 0; i < 55; i++) {

      JXL_QUIET_RETURN_IF_ERROR(

          visitor->F16(kWeights4[i], &upsampling4_weights[i]));

    }

  }

  if (visitor->Conditional((custom_weights_mask & 0x4) != 0)) {

    // 64 5x5 kernels, all of them can be obtained by symmetry from

    // 10, 4 of which are symmetric along their main diagonals. The top

    // left 16 kernels are defined by

    //  0  1  2  3  4   5  6  7  8  9   a  b  c  d  e   f 10 11 12 13

    //  1 14 15 16 17  18 19 1a 1b 1c  1d 1e 1f 20 21  22 23 24 25 26

    //  2 15 27 28 29  2a 2b 2c 2d 2e  2f 30 31 32 33  34 35 36 37 38

    //  3 16 28 39 3a  3b 3c 3d 3e 3f  40 41 42 43 44  45 46 47 48 49

    //  4 17 29 3a 4a  4b 4c 4d 4e 4f  50 51 52 53 54  55 56 57 58 59

    //  5 18 2a 3b 4b  5a 5b 5c 5d 5e  5f 60 61 62 63  64 65 66 67 68

    //  6 19 2b 3c 4c  5b 69 6a 6b 6c  6d 6e 6f 70 71  72 73 74 75 76

    //  7 1a 2c 3d 4d  5c 6a 77 78 79  7a 7b 7c 7d 7e  7f 80 81 82 83

    //  8 1b 2d 3e 4e  5d 6b 78 84 85  86 87 88 89 8a  8b 8c 8d 8e 8f

    //  9 1c 2e 3f 4f  5e 6c 79 85 90  91 92 93 94 95  96 97 98 99 9a

    //  a 1d 2f 40 50  5f 6d 7a 86 91  9b 9c 9d 9e 9f  a0 a1 a2 a3 a4

    //  b 1e 30 41 51  60 6e 7b 87 92  9c a5 a6 a7 a8  a9 aa ab ac ad

    //  c 1f 31 42 52  61 6f 7c 88 93  9d a6 ae af b0  b1 b2 b3 b4 b5

    //  d 20 32 43 53  62 70 7d 89 94  9e a7 af b6 b7  b8 b9 ba bb bc

    //  e 21 33 44 54  63 71 7e 8a 95  9f a8 b0 b7 bd  be bf c0 c1 c2

    //  f 22 34 45 55  64 72 7f 8b 96  a0 a9 b1 b8 be  c3 c4 c5 c6 c7

    // 10 23 35 46 56  65 73 80 8c 97  a1 aa b2 b9 bf  c4 c8 c9 ca cb

    // 11 24 36 47 57  66 74 81 8d 98  a2 ab b3 ba c0  c5 c9 cc cd ce

    // 12 25 37 48 58  67 75 82 8e 99  a3 ac b4 bb c1  c6 ca cd cf d0

    // 13 26 38 49 59  68 76 83 8f 9a  a4 ad b5 bc c2  c7 cb ce d0 d1

    constexpr float kWeights8[210] = {

        -0.02928613f, -0.03706353f, -0.03783812f, -0.03324558f, -0.00447632f,

        -0.02519406f, -0.03752601f, -0.03901508f, -0.03663285f, -0.00646649f,

        -0.02066407f, -0.03838633f, -0.04002101f, -0.03900035f, -0.00901973f,

        -0.01626393f, -0.03954148f, -0.04046620f, -0.03979621f, -0.01224485f,

        0.29895328f,  0.35757708f,  -0.02447552f, -0.01081748f, -0.04314594f,

        0.23903219f,  0.41119301f,  -0.00573046f, -0.01450239f, -0.04246845f,

        0.17567618f,  0.45220643f,  0.02287757f,  -0.01936783f, -0.03583255f,

        0.11572472f,  0.47416733f,  0.06284440f,  -0.02685066f, 0.42720050f,

        -0.02248939f, -0.01155273f, -0.04562755f, 0.28689496f,  0.49093869f,

        -0.00007891f, -0.01545926f, -0.04562659f, 0.21238920f,  0.53980934f,

        0.03369474f,  -0.02070211f, -0.03866988f, 0.14229550f,  0.56593398f,

        0.08045181f,  -0.02888298f, -0.03680918f, -0.00542229f, -0.02920477f,

        -0.02788574f, -0.02118180f, -0.03942402f, -0.00775547f, -0.02433614f,

        -0.03193943f, -0.02030828f, -0.04044014f, -0.01074016f, -0.01930822f,

        -0.03620399f, -0.01974125f, -0.03919545f, -0.01456093f, -0.00045072f,

        -0.00360110f, -0.01020207f, -0.01231907f, -0.00638988f, -0.00071592f,

        -0.00279122f, -0.00957115f, -0.01288327f, -0.00730937f, -0.00107783f,

        -0.00210156f, -0.00890705f, -0.01317668f, -0.00813895f, -0.00153491f,

        -0.02128481f, -0.04173044f, -0.04831487f, -0.03293190f, -0.00525260f,

        -0.01720322f, -0.04052736f, -0.05045706f, -0.03607317f, -0.00738030f,

        -0.01341764f, -0.03965629f, -0.05151616f, -0.03814886f, -0.01005819f,

        0.18968273f,  0.33063684f,  -0.01300105f, -0.01372950f, -0.04017465f,

        0.13727832f,  0.36402234f,  0.01027890f,  -0.01832107f, -0.03365072f,

        0.08734506f,  0.38194295f,  0.04338228f,  -0.02525993f, 0.56408126f,

        0.00458352f,  -0.01648227f, -0.04887868f, 0.24585519f,  0.62026135f,

        0.04314807f,  -0.02213737f, -0.04158014f, 0.16637289f,  0.65027023f,

        0.09621636f,  -0.03101388f, -0.04082742f, -0.00904519f, -0.02790922f,

        -0.02117818f, 0.00798662f,  -0.03995711f, -0.01243427f, -0.02231705f,

        -0.02946266f, 0.00992055f,  -0.03600283f, -0.01684920f, -0.00111684f,

        -0.00411204f, -0.01297130f, -0.01723725f, -0.01022545f, -0.00165306f,

        -0.00313110f, -0.01218016f, -0.01763266f, -0.01125620f, -0.00231663f,

        -0.01374149f, -0.03797620f, -0.05142937f, -0.03117307f, -0.00581914f,

        -0.01064003f, -0.03608089f, -0.05272168f, -0.03375670f, -0.00795586f,

        0.09628104f,  0.27129991f,  -0.00353779f, -0.01734151f, -0.03153981f,

        0.05686230f,  0.28500998f,  0.02230594f,  -0.02374955f, 0.68214326f,

        0.05018048f,  -0.02320852f, -0.04383616f, 0.18459474f,  0.71517975f,

        0.10805613f,  -0.03263677f, -0.03637639f, -0.01394373f, -0.02511203f,

        -0.01728636f, 0.05407331f,  -0.02867568f, -0.01893131f, -0.00240854f,

        -0.00446511f, -0.01636187f, -0.02377053f, -0.01522848f, -0.00333334f,

        -0.00819975f, -0.02964169f, -0.04499287f, -0.02745350f, -0.00612408f,

        0.02727416f,  0.19446600f,  0.00159832f,  -0.02232473f, 0.74982506f,

        0.11452620f,  -0.03348048f, -0.01605681f, -0.02070339f, -0.00458223f};

    for (size_t i = 0; i < 210; i++) {

      JXL_QUIET_RETURN_IF_ERROR(

          visitor->F16(kWeights8[i], &upsampling8_weights[i]));

    }

  }

  return true;

}

ExtraChannelInfo::ExtraChannelInfo() { Bundle::Init(this); }

Status ExtraChannelInfo::VisitFields(Visitor* JXL_RESTRICT visitor) {

  if (visitor->AllDefault(*this, &all_default)) {

    // Overwrite all serialized fields, but not any nonserialized_*.

    visitor->SetDefault(this);

    return true;

  }

  // General

  JXL_QUIET_RETURN_IF_ERROR(visitor->Enum(ExtraChannel::kAlpha, &type));

  JXL_QUIET_RETURN_IF_ERROR(visitor->VisitNested(&bit_depth));

  JXL_QUIET_RETURN_IF_ERROR(

      visitor->U32(Val(0), Val(3), Val(4), BitsOffset(3, 1), 0, &dim_shift));

  if ((1U << dim_shift) > 8) {

    return JXL_FAILURE("dim_shift %u too large", dim_shift);

  }

  JXL_QUIET_RETURN_IF_ERROR(VisitNameString(visitor, &name));

  // Conditional

  if (visitor->Conditional(type == ExtraChannel::kAlpha)) {

    JXL_QUIET_RETURN_IF_ERROR(visitor->Bool(false, &alpha_associated));

  }

  if (visitor->Conditional(type == ExtraChannel::kSpotColor)) {

    for (float& c : spot_color) {

      JXL_QUIET_RETURN_IF_ERROR(visitor->F16(0, &c));

    }

  }

  if (visitor->Conditional(type == ExtraChannel::kCFA)) {

    JXL_QUIET_RETURN_IF_ERROR(visitor->U32(Val(1), Bits(2), BitsOffset(4, 3),

                                           BitsOffset(8, 19), 1, &cfa_channel));

  }

  if (type == ExtraChannel::kUnknown ||

      (int(ExtraChannel::kReserved0) <= int(type) &&

       int(type) <= int(ExtraChannel::kReserved7))) {

    return JXL_FAILURE("Unknown extra channel (bits %u, shift %u, name '%s')\n",

                       bit_depth.bits_per_sample, dim_shift, name.c_str());

  }

  return true;

}

std::string ExtraChannelInfo::DebugString() const {

  std::ostringstream os;

  os << (type == ExtraChannel::kAlpha           ? "Alpha"

         : type == ExtraChannel::kDepth         ? "Depth"

         : type == ExtraChannel::kSpotColor     ? "Spot"

         : type == ExtraChannel::kSelectionMask ? "Mask"

         : type == ExtraChannel::kBlack         ? "Black"

         : type == ExtraChannel::kCFA           ? "CFA"

         : type == ExtraChannel::kThermal       ? "Thermal"

                                                : "Unknown");

  if (type == ExtraChannel::kAlpha && alpha_associated) os << "(premul)";

  os << " " << bit_depth.DebugString();

  os << " shift: " << dim_shift;

  return os.str();

}

ImageMetadata::ImageMetadata() { Bundle::Init(this); }

Status ImageMetadata::VisitFields(Visitor* JXL_RESTRICT visitor) {

  if (visitor->AllDefault(*this, &all_default)) {

    // Overwrite all serialized fields, but not any nonserialized_*.

    visitor->SetDefault(this);

    return true;

  }

  // Bundle::AllDefault does not allow usage when reading (it may abort the

  // program when a codestream has invalid values), but when reading we

  // overwrite the extra_fields value, so do not need to call AllDefault.

  bool tone_mapping_default =

      visitor->IsReading() ? false : Bundle::AllDefault(tone_mapping);

  bool extra_fields = (orientation != 1 || have_preview || have_animation ||

                       have_intrinsic_size || !tone_mapping_default);

  JXL_QUIET_RETURN_IF_ERROR(visitor->Bool(false, &extra_fields));

  if (visitor->Conditional(extra_fields)) {

    orientation--;

    JXL_QUIET_RETURN_IF_ERROR(visitor->Bits(3, 0, &orientation));

    orientation++;

    // (No need for bounds checking because we read exactly 3 bits)

    JXL_QUIET_RETURN_IF_ERROR(visitor->Bool(false, &have_intrinsic_size));

    if (visitor->Conditional(have_intrinsic_size)) {

      JXL_QUIET_RETURN_IF_ERROR(visitor->VisitNested(&intrinsic_size));

    }

    JXL_QUIET_RETURN_IF_ERROR(visitor->Bool(false, &have_preview));

    if (visitor->Conditional(have_preview)) {

      JXL_QUIET_RETURN_IF_ERROR(visitor->VisitNested(&preview_size));

    }

    JXL_QUIET_RETURN_IF_ERROR(visitor->Bool(false, &have_animation));

    if (visitor->Conditional(have_animation)) {

      JXL_QUIET_RETURN_IF_ERROR(visitor->VisitNested(&animation));

    }

  } else {

    orientation = 1;  // identity

    have_intrinsic_size = false;

    have_preview = false;

    have_animation = false;

  }

  JXL_QUIET_RETURN_IF_ERROR(visitor->VisitNested(&bit_depth));

  JXL_QUIET_RETURN_IF_ERROR(

      visitor->Bool(true, &modular_16_bit_buffer_sufficient));

  num_extra_channels = extra_channel_info.size();

  JXL_QUIET_RETURN_IF_ERROR(visitor->U32(Val(0), Val(1), BitsOffset(4, 2),

                                         BitsOffset(12, 1), 0,

                                         &num_extra_channels));

  if (visitor->Conditional(num_extra_channels != 0)) {

    if (visitor->IsReading()) {

      extra_channel_info.resize(num_extra_channels);

    }

    for (ExtraChannelInfo& eci : extra_channel_info) {

      JXL_QUIET_RETURN_IF_ERROR(visitor->VisitNested(&eci));

    }

  }

  JXL_QUIET_RETURN_IF_ERROR(visitor->Bool(true, &xyb_encoded));

  JXL_QUIET_RETURN_IF_ERROR(visitor->VisitNested(&color_encoding));

  if (visitor->Conditional(extra_fields)) {

    JXL_QUIET_RETURN_IF_ERROR(visitor->VisitNested(&tone_mapping));

  }

  // Treat as if only the fields up to extra channels exist.

  if (visitor->IsReading() && nonserialized_only_parse_basic_info) {

    return true;

  }

  JXL_QUIET_RETURN_IF_ERROR(visitor->BeginExtensions(&extensions));

  // Extensions: in chronological order of being added to the format.

  return visitor->EndExtensions();

}

OpsinInverseMatrix::OpsinInverseMatrix() { Bundle::Init(this); }

Status OpsinInverseMatrix::VisitFields(Visitor* JXL_RESTRICT visitor) {

  if (visitor->AllDefault(*this, &all_default)) {

    // Overwrite all serialized fields, but not any nonserialized_*.

    visitor->SetDefault(this);

    return true;

  }

  for (int i = 0; i < 9; ++i) {

    JXL_QUIET_RETURN_IF_ERROR(visitor->F16(

        DefaultInverseOpsinAbsorbanceMatrix()[i], &inverse_matrix[i]));

  }

  for (int i = 0; i < 3; ++i) {

    JXL_QUIET_RETURN_IF_ERROR(

        visitor->F16(kNegOpsinAbsorbanceBiasRGB[i], &opsin_biases[i]));

  }

  for (int i = 0; i < 4; ++i) {

    JXL_QUIET_RETURN_IF_ERROR(

        visitor->F16(kDefaultQuantBias[i], &quant_biases[i]));

  }

  return true;

}

ToneMapping::ToneMapping() { Bundle::Init(this); }

Status ToneMapping::VisitFields(Visitor* JXL_RESTRICT visitor) {

  if (visitor->AllDefault(*this, &all_default)) {

    // Overwrite all serialized fields, but not any nonserialized_*.

    visitor->SetDefault(this);

    return true;

  }

  JXL_QUIET_RETURN_IF_ERROR(

      visitor->F16(kDefaultIntensityTarget, &intensity_target));

  if (intensity_target <= 0.f) {

    return JXL_FAILURE("invalid intensity target");

  }

  JXL_QUIET_RETURN_IF_ERROR(visitor->F16(0.0f, &min_nits));

  if (min_nits < 0.f || min_nits > intensity_target) {

    return JXL_FAILURE("invalid min %f vs max %f", min_nits, intensity_target);

  }

  JXL_QUIET_RETURN_IF_ERROR(visitor->Bool(false, &relative_to_max_display));

  JXL_QUIET_RETURN_IF_ERROR(visitor->F16(0.0f, &linear_below));

  if (linear_below < 0 || (relative_to_max_display && linear_below > 1.0f)) {

    return JXL_FAILURE("invalid linear_below %f (%s)", linear_below,

                       relative_to_max_display ? "relative" : "absolute");

  }

  return true;

}

Status ReadImageMetadata(BitReader* JXL_RESTRICT reader,

                         ImageMetadata* JXL_RESTRICT metadata) {

  return Bundle::Read(reader, metadata);

}

Status WriteImageMetadata(const ImageMetadata& metadata,

                          BitWriter* JXL_RESTRICT writer, size_t layer,

                          AuxOut* aux_out) {

  return Bundle::Write(metadata, writer, layer, aux_out);

}

void ImageMetadata::SetAlphaBits(uint32_t bits, bool alpha_is_premultiplied) {

  std::vector<ExtraChannelInfo>& eciv = extra_channel_info;

  ExtraChannelInfo* alpha = Find(ExtraChannel::kAlpha);

  if (bits == 0) {

    if (alpha != nullptr) {

      // Remove the alpha channel from the extra channel info. It's

      // theoretically possible that there are multiple, remove all in that

      // case. This ensure a next HasAlpha() will return false.

      const auto is_alpha = [](const ExtraChannelInfo& eci) {

        return eci.type == ExtraChannel::kAlpha;

      };

      eciv.erase(std::remove_if(eciv.begin(), eciv.end(), is_alpha),

                 eciv.end());

    }

  } else {

    if (alpha == nullptr) {

      ExtraChannelInfo info;

      info.type = ExtraChannel::kAlpha;

      info.bit_depth.bits_per_sample = bits;

      info.dim_shift = 0;

      info.alpha_associated = alpha_is_premultiplied;

      // Prepend rather than append: in case there already are other extra

      // channels, prefer alpha channel to be listed first.

      eciv.insert(eciv.begin(), info);

    } else {

      // Ignores potential extra alpha channels, only sets to first one.

      alpha->bit_depth.bits_per_sample = bits;

      alpha->bit_depth.floating_point_sample = false;

      alpha->bit_depth.exponent_bits_per_sample = 0;

      alpha->alpha_associated = alpha_is_premultiplied;

    }

  }

  num_extra_channels = extra_channel_info.size();

  if (bits > 12) modular_16_bit_buffer_sufficient = false;

}

std::string ImageMetadata::DebugString() const {

  std::ostringstream os;

  os << bit_depth.DebugString();

  if (modular_16_bit_buffer_sufficient) {

    os << " (modular 16)";

  }

  os << (xyb_encoded ? " xyb encoded" : " orig profile");

  os << " " << Description(color_encoding);

  if (num_extra_channels > 0) {

    os << " extra channels:";

    for (size_t i = 0; i < num_extra_channels; ++i) {

      os << " (" << extra_channel_info[i].DebugString() << ")";

      if (i + 1 < num_extra_channels) os << ",";

    }

  }

  if (have_preview) {

    os << " preview: " << preview_size.xsize() << "x" << preview_size.ysize();

  }

  if (orientation != 1) {

    os << " orientation: " << orientation;

  }

  return os.str();

}

std::string CodecMetadata::DebugString() const {

  std::ostringstream os;

  os << size.xsize() << "x" << size.ysize();

  os << " " << m.DebugString();

  return os.str();

}

}  // namespace jxl