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use std::convert::TryInto;
use crate::{
catalog::assert_len,
error::PdfResult,
objects::{Dictionary, Object, ObjectType},
stream::Stream,
Resolve,
};
use super::descriptor::FontDescriptor;
#[derive(Debug)]
pub struct CidSystemInfo {
/// A string identifying the issuer of the character collection
///
/// For information about assigning a registry identifier, contact
/// the Adobe Solutions Network or consult the ASN Web site
registry: String,
/// A string that uniquely names the character collection within the
/// specified registry
ordering: String,
/// The supplement number of the character collection. An original
/// character collection has a supplement number of 0. Whenever additional
/// CIDs are assigned in a character collection, the supplement number
/// shall be increased. Supplements shall not alter the ordering of
/// existing CIDs in the character collection. This value shall not
/// be used in determining compatibility between character collections
supplement: i32,
}
impl CidSystemInfo {
pub fn from_dict(mut dict: Dictionary, resolver: &mut dyn Resolve) -> PdfResult<Self> {
let registry = dict.expect_string("Registry", resolver)?;
let ordering = dict.expect_string("Ordering", resolver)?;
let supplement = dict.expect_integer("Supplement", resolver)?;
Ok(Self {
registry,
ordering,
supplement,
})
}
}
#[derive(Debug)]
pub struct CidFontDictionary {
/// The PostScript name of the CIDFont. For Type 0 CIDFonts, this shall be
/// the value of the CIDFontName entry in the CIDFont program. For Type 2
/// CIDFonts, it shall be derived the same way as for a simple TrueType font.
/// In either case, the name may have a subset prefix if appropriate
base_font: String,
/// A dictionary containing entries that define the character collection of the
/// CIDFont
cid_system_info: CidSystemInfo,
/// A font descriptor describing the CIDFont’s default metrics other than its
/// glyph widths
font_descriptor: FontDescriptor,
/// The default width for glyphs in the CIDFont
///
/// Default value: 1000 (defined in user units)
dw: i32,
/// A description of the widths for the glyphs in the CIDFont
///
/// NOTE: The array’s elements have a variable format that can specify individual
/// widths for consecutive CIDs or one width for a range of CIDs
///
/// Default value: none (the DW value shall be used for all glyphs)
w: Option<Vec<Object>>,
/// An array of two numbers specifying the default metrics for vertical writing
///
/// Default value: [880 −1000]
dw2: [f32; 2],
/// A description of the metrics for vertical writing for the glyphs in the CIDFont
///
/// Default value: none (the DW2 value shall be used for all glyphs)
w2: Option<Vec<Object>>,
/// A specification of the mapping from CIDs to glyph indices. If the value is a
/// stream, the bytes in the stream shall contain the mapping from CIDs to glyph
/// indices: the glyph index for a particular CID value c shall be a 2-byte value
/// stored in bytes 2 × c and 2 × c + 1, where the first byte shall be the high-order
/// byte. If the value of CIDToGIDMap is a name, it shall be Identity, indicating that
/// the mapping between CIDs and glyph indices is the identity mapping.
///
/// Default value: Identity
///
/// This entry may appear only in a Type 2 CIDFont whose associated TrueType font program
/// is embedded in the PDF file
cid_to_gid_map: CidToGidMap,
}
impl CidFontDictionary {
pub fn from_dict(mut dict: Dictionary, resolver: &mut dyn Resolve) -> PdfResult<Self> {
let base_font = dict.expect_name("BaseFont", resolver)?;
let cid_system_info =
CidSystemInfo::from_dict(dict.expect_dict("CIDSystemInfo", resolver)?, resolver)?;
let font_descriptor =
FontDescriptor::from_dict(dict.expect_dict("FontDescriptor", resolver)?, resolver)?;
let dw = dict.get_integer("DW", resolver)?.unwrap_or(1000);
let w = dict.get_arr("W", resolver)?;
let dw2 = dict
.get_arr("DW2", resolver)?
.map(|arr| -> PdfResult<[f32; 2]> {
assert_len(&arr, 2)?;
Ok(arr
.into_iter()
.map(|obj| resolver.assert_number(obj))
.collect::<PdfResult<Vec<f32>>>()?
.try_into()
.unwrap())
})
.transpose()?
.unwrap_or([880.0, -1000.0]);
let w2 = dict.get_arr("W2", resolver)?;
let cid_to_gid_map = dict
.get_object("CIDToGIDMap", resolver)?
.map(|obj| CidToGidMap::from_obj(obj, resolver))
.transpose()?
.unwrap_or(CidToGidMap::Identity);
Ok(Self {
base_font,
cid_system_info,
font_descriptor,
dw,
w,
dw2,
w2,
cid_to_gid_map,
})
}
}
#[derive(Debug)]
enum CidToGidMap {
Identity,
Stream(Stream),
}
impl CidToGidMap {
pub fn from_obj(obj: Object, resolver: &mut dyn Resolve) -> PdfResult<Self> {
Ok(match resolver.resolve(obj)? {
Object::Name(ref name) if name == "Identity" => Self::Identity,
Object::Stream(stream) => Self::Stream(stream),
found => {
return Err(crate::error::ParseError::MismatchedObjectTypeAny {
found,
expected: &[ObjectType::Name, ObjectType::Stream],
})
}
})
}
}