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//! OCR 配置与触发策略。
/// OCR 处理器配置。
///
/// 控制渲染 DPI、OCR 触发条件和质量阈值。
///
/// # Examples
///
/// ```
/// use easypdf_markdown::ocr::{OcrConfig, OcrTrigger};
///
/// let config = OcrConfig {
/// render_dpi: 300,
/// trigger: OcrTrigger::Always,
/// min_confidence: 0.8,
/// ..OcrConfig::default()
/// };
/// assert_eq!(config.render_dpi, 300);
/// ```
/// OCR 触发条件。
///
/// # Examples
///
/// ```
/// use easypdf_markdown::ocr::OcrTrigger;
///
/// let trigger = OcrTrigger::WhenTextSparse { threshold: 0.3 };
/// assert!(matches!(trigger, OcrTrigger::WhenTextSparse { threshold } if threshold == 0.3));
/// ```