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https://github.com/typst/typst
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Enhance PDF crate API 🚀
This commit is contained in:
Laurenz
Laurenz Mädje
parent
6b8da16be8
commit
da60261376
133
src/pdf.rs
133
src/pdf.rs
@ -4,10 +4,12 @@ use std::fmt;
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use std::io::{self, Write, Cursor};
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use crate::doc::Document;
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use pdf::{PdfWriter, Id, Rect, Version, Trailer};
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use pdf::doc::{DocumentCatalog, PageTree, Page, PageData, Resource, Content};
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use pdf::doc::{Catalog, PageTree, Page, Resource, Content};
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use pdf::text::Text;
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use pdf::font::{Type0Font, CMapEncoding, CIDFont, CIDFontType, CIDSystemInfo,
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WidthRecord, FontDescriptor, EmbeddedFont, GlyphUnit};
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use pdf::font::{
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Type0Font, CMapEncoding, CIDFont, CIDFontType, CIDSystemInfo,
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WidthRecord, FontDescriptor, FontFlags, EmbeddedFont, GlyphUnit
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};
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use opentype::{OpenTypeReader, tables};
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@ -52,18 +54,6 @@ impl fmt::Display for PdfWritingError {
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}
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/// Shortcut macro to create bitflags from bools.
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macro_rules! flags {
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($($bit:expr => $value:expr),*) => {{
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let mut flags = 0;
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$(
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flags |= if $value { 1 << ($bit - 1) } else { 0 };
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)*
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flags
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}};
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($($bit:expr => $value:expr,)*) => (flags!($($bit => $value),*));
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}
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/// Keeps track of the document while letting the pdf writer
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/// generate the _PDF_.
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struct PdfCreator<'a, W: Write> {
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@ -140,9 +130,7 @@ impl<'a, W: Write> PdfCreator<'a, W> {
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self.writer.write_xref_table()?;
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// Trailer
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self.writer.write_trailer(&Trailer {
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root: self.offsets.catalog,
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})?;
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self.writer.write_trailer(&Trailer::new(self.offsets.catalog))?;
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Ok(self.writer.written())
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}
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@ -150,19 +138,13 @@ impl<'a, W: Write> PdfCreator<'a, W> {
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/// Write the document catalog, page tree and pages.
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fn write_pages(&mut self) -> PdfResult<()> {
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// The document catalog
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self.writer.write_obj(self.offsets.catalog, &DocumentCatalog {
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page_tree: self.offsets.page_tree,
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})?;
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self.writer.write_obj(self.offsets.catalog, &Catalog::new(self.offsets.page_tree))?;
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// Root page tree
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self.writer.write_obj(self.offsets.page_tree, &PageTree {
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parent: None,
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kids: (self.offsets.pages.0 ..= self.offsets.pages.1).collect(),
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data: PageData {
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resources: Some(vec![Resource::Font { nr: 1, id: self.offsets.fonts.0 }]),
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.. PageData::none()
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},
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})?;
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self.writer.write_obj(self.offsets.page_tree, PageTree::new()
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.kids(self.offsets.pages.0 ..= self.offsets.pages.1)
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.resource(Resource::Font { nr: 1, id: self.offsets.fonts.0 })
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)?;
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// The page objects
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let mut id = self.offsets.pages.0;
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@ -170,15 +152,10 @@ impl<'a, W: Write> PdfCreator<'a, W> {
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let width = page.size[0].to_points();
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let height = page.size[1].to_points();
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let contents = (self.offsets.contents.0 ..= self.offsets.contents.1).collect();
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self.writer.write_obj(id, &Page {
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parent: self.offsets.page_tree,
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data: PageData {
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media_box: Some(Rect::new(0.0, 0.0, width, height)),
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contents: Some(contents),
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.. PageData::none()
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},
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})?;
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self.writer.write_obj(id, Page::new(self.offsets.page_tree)
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.media_box(Rect::new(0.0, 0.0, width, height))
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.contents(self.offsets.contents.0 ..= self.offsets.contents.1)
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)?;
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id += 1;
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}
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@ -216,54 +193,50 @@ impl<'a, W: Write> PdfCreator<'a, W> {
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let base_font = font_data.name.post_script_name.as_ref()
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.unwrap_or(&self.doc.font);
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self.writer.write_obj(id, &Type0Font {
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base_font: base_font.clone(),
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encoding: CMapEncoding::Predefined("Identity-H".to_owned()),
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descendant_font: id + 1,
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to_unicode: None,
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}).unwrap();
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self.writer.write_obj(id, &Type0Font::new(
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base_font.clone(),
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CMapEncoding::Predefined("Identity-H".to_owned()),
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id + 1
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)).unwrap();
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self.writer.write_obj(id + 1, &CIDFont {
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subtype: CIDFontType::Type2,
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base_font: base_font.clone(),
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cid_system_info: CIDSystemInfo {
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registry: "(Adobe)".to_owned(),
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ordering: "(Identity)".to_owned(),
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supplement: 0,
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},
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font_descriptor: id + 2,
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widths: Some(vec![WidthRecord::Start(0,
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font_data.hmtx.metrics.iter()
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.map(|m| convert(m.advance_width))
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.collect::<Vec<_>>()
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)]),
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cid_to_gid_map: Some(CMapEncoding::Predefined("Identity".to_owned())),
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}).unwrap();
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self.writer.write_obj(id + 1,
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CIDFont::new(
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CIDFontType::Type2,
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base_font.clone(),
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CIDSystemInfo::new("(Adobe)", "(Identity)", 0),
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id + 2,
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).widths(vec![
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WidthRecord::start(0, font_data.hmtx.metrics.iter().map(|m| convert(m.advance_width))
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)])
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).unwrap();
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self.writer.write_obj(id + 2, &FontDescriptor {
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font_name: base_font.clone(),
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flags: flags!(
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1 => font_data.post.is_fixed_pitch,
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2 => base_font.contains("Serif"),
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3 => true, 4 => false, 6 => false,
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7 => (font_data.head.mac_style & 1) != 0,
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17 => false, 18 => true, 19 => false,
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),
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found_bbox: Rect::new(
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let mut flags = FontFlags::empty();
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flags.set(FontFlags::FIXED_PITCH, font_data.post.is_fixed_pitch);
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flags.set(FontFlags::SERIF, base_font.contains("Serif"));
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flags.insert(FontFlags::SYMBOLIC);
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flags.set(FontFlags::ITALIC, (font_data.head.mac_style & 1) != 0);
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flags.insert(FontFlags::SMALL_CAP);
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self.writer.write_obj(id + 2,
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FontDescriptor::new(
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base_font.clone(),
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flags,
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font_data.post.italic_angle.to_f32(),
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)
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.font_bbox(Rect::new(
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convert(font_data.head.x_min),
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convert(font_data.head.y_min),
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convert(font_data.head.x_max),
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convert(font_data.head.y_max)
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),
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italic_angle: font_data.post.italic_angle.to_f32(),
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ascent: convert(font_data.os2.s_typo_ascender),
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descent: convert(font_data.os2.s_typo_descender),
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cap_height: convert(font_data.os2.s_cap_height
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.unwrap_or(font_data.os2.s_typo_ascender)),
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stem_v: (10.0 + 220.0 *
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(font_data.os2.us_weight_class as f32 - 50.0) / 900.0) as GlyphUnit,
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font_file_3: Some(id + 3),
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}).unwrap();
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))
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.ascent(convert(font_data.os2.s_typo_ascender))
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.descent(convert(font_data.os2.s_typo_descender))
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.cap_height(convert(font_data.os2.s_cap_height
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.unwrap_or(font_data.os2.s_typo_ascender)))
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.stem_v((10.0 + 220.0 * (font_data.os2.us_weight_class as f32
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- 50.0) / 900.0) as GlyphUnit)
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.font_file_3(id + 3)
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).unwrap();
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self.writer.write_obj(id + 3, &EmbeddedFont::OpenType(&font_data.data)).unwrap();
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