Struct PreciseLayout 

pub struct PreciseLayout {
    pub version: String,
    pub presentation_type: String,
    pub target_format: String,
    pub page_size: PrecisePageSize,
    pub content_hash: String,
    pub generated_at: DateTime<Utc>,
    pub page_template: Option<PageTemplate>,
    pub pages: Vec<PrecisePage>,
    pub fonts: HashMap<String, FontMetrics>,
}

Precise layout for a specific page format.

Precise layouts store exact positions for all elements, ensuring identical rendering across different implementations. This is required for documents in FROZEN or PUBLISHED state.

Fields

version: String

Format version.

presentation_type: String

Presentation type (always “precise”).

target_format: String

Target page format name (e.g., “letter”, “a4”, “legal”, “custom”).

page_size: PrecisePageSize

Exact page dimensions.

content_hash: String

Hash of the semantic content layer when this layout was generated. Used to detect staleness when content changes. Note: The document ID covers semantic content only; this layout hash can be included in scoped signatures for layout attestation.

generated_at: DateTime<Utc>

Timestamp when this layout was generated.

page_template: Option<PageTemplate>

Optional page template for headers/footers/margins.

pages: Vec<PrecisePage>

Page definitions with precise element positions.

fonts: HashMap<String, FontMetrics>

Font metrics for exact text reproduction.

Implementations

impl PreciseLayout

pub fn new_letter(content_hash: impl Into<String>) -> Self

Create a new precise layout for US Letter format.

pub fn new_a4(content_hash: impl Into<String>) -> Self

Create a new precise layout for A4 format.

pub fn new_legal(content_hash: impl Into<String>) -> Self

Create a new precise layout for US Legal format.

pub fn is_stale(&self, current_content_hash: &str) -> bool

Check if this layout is stale (content has changed).

pub fn add_page(&mut self, page: PrecisePage)

Add a page to this layout.

pub fn with_template(self, template: PageTemplate) -> Self

Set the page template.

pub fn with_font(self, name: impl Into<String>, metrics: FontMetrics) -> Self

Add font metrics.

Trait Implementations

impl Clone for PreciseLayout

fn clone(&self) -> PreciseLayout

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PreciseLayout

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for PreciseLayout

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for PreciseLayout

fn eq(&self, other: &PreciseLayout) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for PreciseLayout

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for PreciseLayout