pdfluent 1.0.0

Pure-Rust PDF SDK with PDF/A, digital signatures, WASM, and experimental (feature-gated) XFA support.
Documentation 
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//! Watermarking options.

// Copyright (c) 2026 Innovation Trigger B.V.
//
// PDFluent is available under two licences, at your option: the GNU AGPLv3, or
// the PDFluent Commercial Licence. See the LICENSE file in this repository --
// that file travels with the copy you received, which a URL does not.

/// Page rotation in 90-degree increments.
///
/// All rotations are **clockwise** relative to the upright page orientation,
/// matching ISO 32000-2 §14.11 (`/Rotate` entry).
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[non_exhaustive]
pub enum Rotation {
    /// 90° clockwise.
    Clockwise90,
    /// 180°.
    Clockwise180,
    /// 270° clockwise (= 90° counter-clockwise).
    Clockwise270,
}

/// Layer — whether the watermark goes in front of or behind content.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Layer {
    /// Behind existing content.
    Background,
    /// In front of existing content.
    Foreground,
}

/// Position of a watermark on the page.
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Position {
    /// Centred.
    Center,
    /// Top-left with offset from the corner.
    TopLeft(f32, f32),
    /// Top-right with offset.
    TopRight(f32, f32),
    /// Bottom-left with offset.
    BottomLeft(f32, f32),
    /// Bottom-right with offset.
    BottomRight(f32, f32),
    /// Exact position in PDF points from bottom-left.
    Exact(f32, f32),
}

/// Options for a text watermark.
///
/// Image-watermark support ships in Epic 2 #1225 via the unified
/// `PageDecoration` builder.
#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct WatermarkOptions {
    pub(crate) position: Position,
    pub(crate) rotation_degrees: f32,
    pub(crate) opacity: f32,
    pub(crate) layer: Layer,
    pub(crate) font_size: f32,
    pub(crate) color_rgb: (f32, f32, f32),
}

impl Default for WatermarkOptions {
    fn default() -> Self {
        Self {
            position: Position::Center,
            rotation_degrees: 0.0,
            opacity: 0.5,
            layer: Layer::Foreground,
            font_size: 48.0,
            color_rgb: (0.6, 0.6, 0.6),
        }
    }
}

impl WatermarkOptions {
    /// A centred watermark with default styling.
    pub fn centered() -> Self {
        Self::default()
    }

    /// Place the watermark somewhere other than the centre.
    ///
    /// `Position` has six variants and `centered()` was the only way to set
    /// any of them, so five were public and unreachable. Coordinates are in
    /// PDF points; for the corner variants they are the inset from that
    /// corner, for `Exact` they are measured from the bottom-left.
    pub fn at(mut self, position: Position) -> Self {
        self.position = position;
        self
    }

    /// Rotate the watermark by the given angle in degrees.
    pub fn rotated(mut self, degrees: f32) -> Self {
        self.rotation_degrees = degrees;
        self
    }

    /// Set opacity in `[0.0, 1.0]`.
    pub fn opacity(mut self, alpha: f32) -> Self {
        self.opacity = alpha;
        self
    }

    /// Choose foreground or background placement.
    pub fn layer(mut self, layer: Layer) -> Self {
        self.layer = layer;
        self
    }

    /// Set font size.
    pub fn font_size(mut self, pt: f32) -> Self {
        self.font_size = pt;
        self
    }

    /// Set text colour.
    pub fn color(mut self, r: f32, g: f32, b: f32) -> Self {
        self.color_rgb = (r, g, b);
        self
    }
}