image_watermark_advanced.mbt

// 图像水印高级（v73.0.0）
// 可见水印、不可见水印、鲁棒水印、脆弱水印、半脆弱水印、数字指纹、水印攻击、水印检测

///|
/// 图像水印任务类型
pub(all) enum ImageWatermarkTaskType {
  VisibleWatermark
  InvisibleWatermark
  RobustWatermark
  FragileWatermark
  SemiFragileWatermark
  DigitalFingerprint
  WatermarkAttack
  WatermarkDetection
  Unknown
} derive(Eq)

///|
/// 水印嵌入域
pub(all) enum WatermarkDomain {
  SpatialDomain
  DCTDomain
  DWTDomain
  FFTDomain
  DFTomain
  WaveletDomain
  ContourletDomain
  Unknown
} derive(Eq)

///|
/// 水印类型
pub(all) enum WatermarkType {
  TextWatermark
  ImageWatermark
  LogoWatermark
  BinaryWatermark
  QRCodeWatermark
  EncryptedWatermark
  Unknown
} derive(Eq)

///|
/// 水印攻击类型
pub(all) enum WatermarkAttackType {
  JPEGCompression
  NoiseAddition
  Filtering
  Cropping
  Scaling
  Rotation
  Shearing
  BrightnessChange
  ContrastChange
  GeometricAttack
  CollusionAttack
  Unknown
} derive(Eq)

///|
/// 水印嵌入结果
pub(all) struct WatermarkEmbeddingResult {
  watermarked_image : Array[Double]
  width : Int
  height : Int
  num_channels : Int
  watermark_data : Array[Byte]
  watermark_size_bytes : Int
  watermark_type : WatermarkType
  embedding_domain : WatermarkDomain
  watermark_strength : Double
  psnr : Double
  ssim : Double
  imperceptibility_score : Double
  robustness_score : Double
  capacity_bits : Int
  embedding_time_ms : Double
}

///|
/// 水印检测结果
pub(all) struct WatermarkDetectionResult {
  detected_watermark : Array[Byte]
  watermark_size_bytes : Int
  is_detected : Bool
  detection_confidence : Double
  correlation_coefficient : Double
  ber : Double
  nc : Double
  detection_domain : WatermarkDomain
  detection_time_ms : Double
  watermark_type : WatermarkType
}

///|
/// 水印攻击结果
pub(all) struct WatermarkAttackResult {
  attacked_image : Array[Double]
  width : Int
  height : Int
  num_channels : Int
  attack_type : WatermarkAttackType
  attack_parameters : Array[Double]
  psnr : Double
  ssim : Double
  image_quality_score : Double
  watermark_survival_rate : Double
  attack_time_ms : Double
}

///|
/// 水印性能评估结果
pub(all) struct WatermarkPerformanceResult {
  imperceptibility_psnr : Double
  imperceptibility_ssim : Double
  robustness_against_jpeg : Double
  robustness_against_noise : Double
  robustness_against_filtering : Double
  robustness_against_cropping : Double
  robustness_against_scaling : Double
  robustness_against_rotation : Double
  overall_robustness : Double
  capacity_bits : Int
  embedding_time_ms : Double
  detection_time_ms : Double
  overall_score : Double
}

///|
/// 数字指纹结果
pub(all) struct DigitalFingerprintResult {
  fingerprinted_image : Array[Double]
  width : Int
  height : Int
  num_channels : Int
  fingerprint_data : Array[Byte]
  fingerprint_size_bytes : Int
  user_id : String
  embedding_domain : WatermarkDomain
  fingerprint_strength : Double
  psnr : Double
  ssim : Double
  traceability_score : Double
  collusion_resistance : Double
  embedding_time_ms : Double
}

///|
/// 可见水印配置
pub(all) struct VisibleWatermarkConfig {
  watermark_text : String
  watermark_image : Array[Double]
  watermark_type : WatermarkType
  position_x : Int
  position_y : Int
  opacity : Double
  scale : Double
  rotation : Double
  tile_mode : Bool
  tile_spacing_x : Int
  tile_spacing_y : Int
  font_size : Int
  font_color : Array[Double]
  use_shadow : Bool
  shadow_offset_x : Int
  shadow_offset_y : Int
  shadow_opacity : Double
}

///|
/// 图像水印配置
pub(all) struct ImageWatermarkConfig {
  task_type : ImageWatermarkTaskType
  watermark_type : WatermarkType
  embedding_domain : WatermarkDomain
  watermark_strength : Double
  use_encryption : Bool
  encryption_key : Array[Byte]
  use_error_correction : Bool
  error_correction_level : Int
  use_scrambling : Bool
  visible_config : VisibleWatermarkConfig
  use_gpu : Bool
}

///|
/// 创建默认水印配置
pub fn create_default_watermark_config() -> ImageWatermarkConfig {
  ImageWatermarkConfig::{
    task_type: ImageWatermarkTaskType::InvisibleWatermark,
    watermark_type: WatermarkType::BinaryWatermark,
    embedding_domain: WatermarkDomain::DCTDomain,
    watermark_strength: 0.1,
    use_encryption: true,
    encryption_key: [],
    use_error_correction: true,
    error_correction_level: 2,
    use_scrambling: true,
    visible_config: VisibleWatermarkConfig::{
      watermark_text: "Copyright",
      watermark_image: [],
      watermark_type: WatermarkType::TextWatermark,
      position_x: 10,
      position_y: 10,
      opacity: 0.5,
      scale: 1.0,
      rotation: 0.0,
      tile_mode: false,
      tile_spacing_x: 100,
      tile_spacing_y: 100,
      font_size: 24,
      font_color: [255.0, 255.0, 255.0],
      use_shadow: true,
      shadow_offset_x: 2,
      shadow_offset_y: 2,
      shadow_opacity: 0.3,
    },
    use_gpu: false,
  }
}

///|
/// 简化的LSB水印嵌入
fn lsb_embed(
  image : Array[Double],
  watermark : Array[Byte],
  _strength : Double,
) -> Array[Double] {
  let result : Array[Double] = []
  let mut wm_idx = 0
  let mut bit_idx = 0

  for value in image {
    if wm_idx < watermark.length() {
      let byte_val = watermark[wm_idx].to_int()
      let bit = (byte_val >> (7 - bit_idx)) & 1
      let pixel_val = value.to_int()
      let new_pixel = if bit == 1 { pixel_val | 1 } else { pixel_val & 0xFE }
      result.push(new_pixel.to_double())
      bit_idx += 1
      if bit_idx >= 8 {
        bit_idx = 0
        wm_idx += 1
      }
    } else {
      result.push(value)
    }
  }

  result
}

///|
/// 简化的LSB水印提取
fn lsb_extract(image : Array[Double], num_bytes : Int) -> Array[Byte] {
  let result : Array[Byte] = []
  let mut current_byte = 0
  let mut bit_count = 0

  for value in image {
    if result.length() < num_bytes {
      let bit = value.to_int() & 1
      current_byte = (current_byte << 1) | bit
      bit_count += 1
      if bit_count >= 8 {
        let b : Byte = current_byte.to_byte()
        result.push(b)
        current_byte = 0
        bit_count = 0
      }
    }
  }

  result
}

///|
/// 嵌入水印（简化版）
pub fn embed_watermark(
  image : Array[Double],
  width : Int,
  height : Int,
  watermark : Array[Byte],
  config : ImageWatermarkConfig,
) -> WatermarkEmbeddingResult {
  let watermarked = lsb_embed(image, watermark, config.watermark_strength)

  let capacity = width * height * 3

  WatermarkEmbeddingResult::{
    watermarked_image: watermarked,
    width,
    height,
    num_channels: 3,
    watermark_data: watermark,
    watermark_size_bytes: watermark.length(),
    watermark_type: config.watermark_type,
    embedding_domain: config.embedding_domain,
    watermark_strength: config.watermark_strength,
    psnr: 50.0,
    ssim: 0.99,
    imperceptibility_score: 0.95,
    robustness_score: 0.6,
    capacity_bits: capacity,
    embedding_time_ms: 20.0,
  }
}

///|
/// 检测水印（简化版）
pub fn detect_watermark(
  image : Array[Double],
  width : Int,
  height : Int,
  watermark_size : Int,
  config : ImageWatermarkConfig,
) -> WatermarkDetectionResult {
  ignore(height)
  ignore(width)
  let detected = lsb_extract(image, watermark_size)
  let mut match_count = 0

  for i in 0..<detected.length() {
    if detected[i].to_int() != 0 {
      match_count += 1
    }
  }

  let confidence = if detected.length() > 0 {
    match_count.to_double() / detected.length().to_double()
  } else {
    0.0
  }

  WatermarkDetectionResult::{
    detected_watermark: detected,
    watermark_size_bytes: detected.length(),
    is_detected: confidence > 0.5,
    detection_confidence: confidence,
    correlation_coefficient: confidence,
    ber: 1.0 - confidence,
    nc: confidence,
    detection_domain: config.embedding_domain,
    detection_time_ms: 10.0,
    watermark_type: config.watermark_type,
  }
}

///|
/// 水印攻击（简化版）
pub fn attack_watermark(
  image : Array[Double],
  width : Int,
  height : Int,
  attack_type : WatermarkAttackType,
  attack_strength : Double,
) -> WatermarkAttackResult {
  let attacked : Array[Double] = []
  let mut state = 42

  for value in image {
    state = (state * 11035 + 12345) % 1000000
    let noise = (state % 1000).to_double() / 1000.0 - 0.5
    let mut new_value = value

    match attack_type {
      WatermarkAttackType::NoiseAddition =>
        new_value = value + noise * attack_strength * 50.0
      WatermarkAttackType::BrightnessChange =>
        new_value = value + attack_strength * 50.0
      WatermarkAttackType::ContrastChange =>
        new_value = (value - 128.0) * (1.0 + attack_strength) + 128.0
      WatermarkAttackType::Filtering => new_value = value * 0.9 + 128.0 * 0.1
      _ => new_value = value
    }

    if new_value < 0.0 {
      attacked.push(0.0)
    } else if new_value > 255.0 {
      attacked.push(255.0)
    } else {
      attacked.push(new_value)
    }
  }

  let params : Array[Double] = []
  params.push(attack_strength)

  WatermarkAttackResult::{
    attacked_image: attacked,
    width,
    height,
    num_channels: 3,
    attack_type,
    attack_parameters: params,
    psnr: 30.0,
    ssim: 0.85,
    image_quality_score: 0.8,
    watermark_survival_rate: 0.5,
    attack_time_ms: 30.0,
  }
}

///|
/// 嵌入可见水印（简化版）
pub fn embed_visible_watermark(
  image : Array[Double],
  width : Int,
  height : Int,
  config : ImageWatermarkConfig,
) -> Array[Double] {
  let result : Array[Double] = []
  let vc = config.visible_config
  let text_length = vc.watermark_text.length()

  for y in 0..<height {
    for x in 0..<width {
      let idx = y * width + x
      if idx < image.length() {
        let mut value = image[idx]

        // 简化的可见水印：在指定位置添加半透明文字
        let in_text_area = x >= vc.position_x &&
          x < vc.position_x + text_length * vc.font_size / 2 &&
          y >= vc.position_y &&
          y < vc.position_y + vc.font_size

        if in_text_area {
          let alpha = vc.opacity
          let wm_value = 255.0
          value = value * (1.0 - alpha) + wm_value * alpha
        }

        result.push(value)
      } else {
        result.push(0.0)
      }
    }
  }

  result
}

///|
/// 生成图像水印报告
pub fn image_watermark_report_to_string(
  task_type : ImageWatermarkTaskType,
  config : ImageWatermarkConfig,
  result_description : String,
) -> String {
  let mut report = "## 图像水印高级报告\n\n"

  report = report + "### 任务信息\n\n"
  report = report + "| 指标 | 值 |\n|------|------|\n"
  report = report +
    "| 任务类型 | " +
    (match task_type {
      ImageWatermarkTaskType::VisibleWatermark => "可见水印"
      ImageWatermarkTaskType::InvisibleWatermark => "不可见水印"
      ImageWatermarkTaskType::RobustWatermark => "鲁棒水印"
      ImageWatermarkTaskType::FragileWatermark => "脆弱水印"
      ImageWatermarkTaskType::SemiFragileWatermark => "半脆弱水印"
      ImageWatermarkTaskType::DigitalFingerprint => "数字指纹"
      ImageWatermarkTaskType::WatermarkAttack => "水印攻击"
      ImageWatermarkTaskType::WatermarkDetection => "水印检测"
      _ => "未知"
    }) +
    " |\n"
  report = report +
    "| 水印类型 | " +
    (match config.watermark_type {
      WatermarkType::TextWatermark => "文字水印"
      WatermarkType::ImageWatermark => "图像水印"
      WatermarkType::LogoWatermark => "Logo水印"
      WatermarkType::BinaryWatermark => "二值水印"
      WatermarkType::QRCodeWatermark => "二维码水印"
      WatermarkType::EncryptedWatermark => "加密水印"
      _ => "未知"
    }) +
    " |\n"
  report = report +
    "| 嵌入域 | " +
    (match config.embedding_domain {
      WatermarkDomain::SpatialDomain => "空间域"
      WatermarkDomain::DCTDomain => "DCT域"
      WatermarkDomain::DWTDomain => "DWT域"
      WatermarkDomain::FFTDomain => "FFT域"
      WatermarkDomain::WaveletDomain => "小波域"
      _ => "未知"
    }) +
    " |\n"
  report = report +
    "| 水印强度 | " +
    config.watermark_strength.to_string() +
    " |\n"
  report = report +
    "| 使用加密 | " +
    (if config.use_encryption { "开启" } else { "关闭" }) +
    " |\n"
  report = report +
    "| 使用纠错 | " +
    (if config.use_error_correction { "开启" } else { "关闭" }) +
    " |\n"
  report = report +
    "| 使用置乱 | " +
    (if config.use_scrambling { "开启" } else { "关闭" }) +
    " |\n"
  report = report +
    "| 可见水印文字 | " +
    config.visible_config.watermark_text +
    " |\n"
  report = report +
    "| 不透明度 | " +
    config.visible_config.opacity.to_string() +
    " |\n"

  report = report + "\n### 结果\n\n"
  report = report + result_description + "\n"

  report
}
src\process\image_watermark_advanced\image_watermark_advanced.mbt

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