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Write ToUnicode mapping 📜

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This commit is contained in:
Laurenz 2019-03-31 14:13:10 +02:00
parent 0fceff5aa4
commit 0b2ae78534
1 changed files with 20 additions and 12 deletions
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32
src/export/pdf.rs
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@ -5,7 +5,7 @@ use std::io::{self, Write};
use pdf::{PdfWriter, Ref, Rect, Version, Trailer, Content};
use pdf::doc::{Catalog, PageTree, Page, Resource, Text};
use pdf::font::{Type0Font, CIDFont, CIDFontType, CIDSystemInfo, FontDescriptor, FontFlags};
use pdf::font::{GlyphUnit, CMapEncoding, WidthRecord, FontStream, EmbeddedFontType};
use pdf::font::{GlyphUnit, CMap, CMapEncoding, WidthRecord, FontStream, EmbeddedFontType};
use crate::doc::{Document, Text as DocText, TextCommand};
use crate::font::{Font, FontError};
use crate::engine::Size;
@ -165,24 +165,32 @@ impl<'d, W: Write> PdfEngine<'d, W> {
for font in &self.fonts {
// Write the base font object referencing the CID font.
self.writer.write_obj(id, &Type0Font::new(
font.name.clone(),
CMapEncoding::Predefined("Identity-H".to_owned()),
id + 1
))?;
self.writer.write_obj(id,
Type0Font::new(
font.name.clone(),
CMapEncoding::Predefined("Identity-H".to_owned()),
id + 1
).to_unicode(id + 2)
)?;
let system_info = CIDSystemInfo::new("(Adobe)", "(Identity)", 0);
// Write the CID font referencing the font descriptor.
self.writer.write_obj(id + 1,
CIDFont::new(
CIDFontType::Type2,
font.name.clone(),
CIDSystemInfo::new("(Adobe)", "(Identity)", 0),
id + 2,
system_info.clone(),
id + 3,
).widths(vec![WidthRecord::start(0, font.widths.clone())])
)?;
// The CMap, which maps glyphs to unicode codepoints.
let mapping = font.font.mapping.iter().map(|(&c, &cid)| (cid, c));
self.writer.write_obj(id + 2, &CMap::new("Custom", system_info, mapping))?;
// Write the font descriptor (contains the global information about the font).
self.writer.write_obj(id + 2,
self.writer.write_obj(id + 3,
FontDescriptor::new(
font.name.clone(),
font.flags,
@ -193,16 +201,16 @@ impl<'d, W: Write> PdfEngine<'d, W> {
.descent(font.descender)
.cap_height(font.cap_height)
.stem_v(font.stem_v)
.font_file_3(id + 3)
.font_file_3(id + 4)
)?;
// Finally write the subsetted font program.
self.writer.write_obj(id + 3, &FontStream::new(
self.writer.write_obj(id + 4, &FontStream::new(
&font.program,
EmbeddedFontType::OpenType,
))?;
id += 4;
id += 5;
}
Ok(())