graphitepdf-kit 0.4.0

#[cfg(feature = "fonts-engine")]
use crate::error::{GraphitePdfKitError, Result};
use graphitepdf_font::{LoadedFont, StandardFont};
use std::collections::HashMap;

#[derive(Clone, Debug)]
pub struct Font {
    pub name: String,
    pub data: Vec<u8>,
    standard_font: Option<StandardFont>,
}

impl Font {
    #[cfg(feature = "fonts-engine")]
    pub fn from_bytes(name: impl Into<String>, data: Vec<u8>) -> Result<Self> {
        // Verify font data with ttf-parser
        let _ = ttf_parser::Face::parse(&data, 0)
            .map_err(|e| GraphitePdfKitError::FontError(format!("Invalid font data: {:?}", e)))?;

        Ok(Self {
            name: name.into(),
            data,
            standard_font: None,
        })
    }

    pub fn standard(name: StandardFont) -> Self {
        Self {
            name: name.as_str().to_string(),
            data: Vec::new(),
            standard_font: Some(name),
        }
    }

    pub fn name(&self) -> &str {
        &self.name
    }

    pub fn data(&self) -> &[u8] {
        &self.data
    }

    pub const fn standard_font(&self) -> Option<StandardFont> {
        self.standard_font
    }

    pub fn base_font_name(&self) -> &str {
        match self.standard_font {
            Some(font) => font.as_str(),
            None => self.name.as_str(),
        }
    }

    #[cfg(feature = "fonts-engine")]
    pub fn measure_text_width(&self, text: &str, font_size: f64) -> Result<f64> {
        if self.data.is_empty() {
            // For standard fonts, use rough estimate
            Ok(text.len() as f64 * font_size * 0.6)
        } else {
            let face = ttf_parser::Face::parse(&self.data, 0).map_err(|e| {
                GraphitePdfKitError::FontError(format!("Failed to parse font: {:?}", e))
            })?;

            let units_per_em = face.units_per_em() as f64;
            let scale = font_size / units_per_em;

            let mut width = 0.0;
            for c in text.chars() {
                if let Some(glyph_id) = face.glyph_index(c) {
                    if let Some(advance) = face.glyph_hor_advance(glyph_id) {
                        width += advance as f64 * scale;
                    }
                }
            }
            Ok(width)
        }
    }
}

impl From<StandardFont> for Font {
    fn from(value: StandardFont) -> Self {
        Self::standard(value)
    }
}

impl From<&LoadedFont> for Font {
    fn from(value: &LoadedFont) -> Self {
        if let Some(font) = value.standard_font() {
            return Self::standard(font);
        }

        Self {
            name: value.descriptor().family().to_string(),
            data: value.bytes().map(ToOwned::to_owned).unwrap_or_default(),
            standard_font: None,
        }
    }
}

impl From<LoadedFont> for Font {
    fn from(value: LoadedFont) -> Self {
        Self::from(&value)
    }
}

#[derive(Clone, Debug, Default)]
pub struct FontRegistry {
    pub fonts: HashMap<String, (Font, u64)>,
    next_id: u64,
}

impl FontRegistry {
    pub fn new() -> Self {
        Self {
            fonts: HashMap::new(),
            next_id: 1,
        }
    }

    pub fn with_default_font() -> Self {
        let mut registry = Self::new();
        registry.register(Font::standard(StandardFont::Helvetica));
        registry
    }

    pub fn register(&mut self, font: impl Into<Font>) -> String {
        let font = font.into();
        let id = self.next_id;
        let name = format!("F{}", id);
        self.next_id += 1;
        self.fonts.insert(name.clone(), (font, id));
        name
    }

    pub fn get(&self, name: &str) -> Option<&Font> {
        self.fonts.get(name).map(|(font, _)| font)
    }
}