diff options
Diffstat (limited to 'src/export/pdf.rs')
| -rw-r--r-- | src/export/pdf.rs | 226 |
1 files changed, 100 insertions, 126 deletions
diff --git a/src/export/pdf.rs b/src/export/pdf.rs index f8144ad9..b8fc1e39 100644 --- a/src/export/pdf.rs +++ b/src/export/pdf.rs @@ -43,34 +43,42 @@ const SRGB_GRAY: Name<'static> = Name(b"srgbgray"); /// An exporter for a whole PDF document. struct PdfExporter<'a> { + writer: PdfWriter, fonts: &'a FontStore, images: &'a ImageStore, - writer: PdfWriter, - alloc: Ref, pages: Vec<Page>, - face_map: Remapper<FaceId>, + page_heights: Vec<f32>, + alloc: Ref, + page_tree_ref: Ref, face_refs: Vec<Ref>, - glyph_sets: HashMap<FaceId, HashSet<u16>>, - image_map: Remapper<ImageId>, image_refs: Vec<Ref>, page_refs: Vec<Ref>, + face_map: Remapper<FaceId>, + image_map: Remapper<ImageId>, + glyph_sets: HashMap<FaceId, HashSet<u16>>, + languages: HashMap<Lang, usize>, heading_tree: Vec<HeadingNode>, } impl<'a> PdfExporter<'a> { fn new(ctx: &'a Context) -> Self { + let mut alloc = Ref::new(1); + let page_tree_ref = alloc.bump(); Self { + writer: PdfWriter::new(), fonts: &ctx.fonts, images: &ctx.images, - writer: PdfWriter::new(), - alloc: Ref::new(1), pages: vec![], - face_map: Remapper::new(), + page_heights: vec![], + alloc, + page_tree_ref, + page_refs: vec![], face_refs: vec![], - glyph_sets: HashMap::new(), - image_map: Remapper::new(), image_refs: vec![], - page_refs: vec![], + face_map: Remapper::new(), + image_map: Remapper::new(), + glyph_sets: HashMap::new(), + languages: HashMap::new(), heading_tree: vec![], } } @@ -79,7 +87,15 @@ impl<'a> PdfExporter<'a> { self.build_pages(frames); self.write_fonts(); self.write_images(); - self.write_structure(); + + // The root page tree. + for page in std::mem::take(&mut self.pages).into_iter() { + self.write_page(page); + } + + self.write_page_tree(); + self.write_catalog(); + self.writer.finish() } @@ -88,6 +104,7 @@ impl<'a> PdfExporter<'a> { let page_id = self.alloc.bump(); self.page_refs.push(page_id); let page = PageExporter::new(self, page_id).export(frame); + self.page_heights.push(page.size.y.to_f32()); self.pages.push(page); } } @@ -307,45 +324,11 @@ impl<'a> PdfExporter<'a> { } } - fn write_structure(&mut self) { - // The root page tree. - let page_tree_ref = self.alloc.bump(); - - // The page objects (non-root nodes in the page tree). - let mut page_heights = - self.pages.iter().map(|page| page.size.y.to_f32()).collect(); - - let mut languages = HashMap::new(); - - for (page, page_id) in std::mem::take(&mut self.pages) - .into_iter() - .zip(self.page_refs.clone().iter()) - { - self.write_page( - page, - *page_id, - page_tree_ref, - &mut languages, - &mut page_heights, - ); - } - - self.write_page_tree(page_tree_ref); - self.write_catalog(page_tree_ref, &languages); - } - - fn write_page( - &mut self, - page: Page, - page_id: Ref, - page_tree_ref: Ref, - languages: &mut HashMap<Lang, usize>, - page_heights: &mut Vec<f32>, - ) { + fn write_page(&mut self, page: Page) { let content_id = self.alloc.bump(); - let mut page_writer = self.writer.page(page_id); - page_writer.parent(page_tree_ref); + let mut page_writer = self.writer.page(page.id); + page_writer.parent(self.page_tree_ref); let w = page.size.x.to_f32(); let h = page.size.y.to_f32(); @@ -364,7 +347,7 @@ impl<'a> PdfExporter<'a> { } Destination::Internal(loc) => { let index = loc.page - 1; - let height = page_heights[index]; + let height = self.page_heights[index]; link.action() .action_type(ActionType::GoTo) .destination_direct() @@ -377,20 +360,13 @@ impl<'a> PdfExporter<'a> { annotations.finish(); page_writer.finish(); - for (lang, count) in page.languages { - languages - .entry(lang) - .and_modify(|x| *x += count) - .or_insert_with(|| count); - } - self.writer .stream(content_id, &deflate(&page.content.finish())) .filter(Filter::FlateDecode); } - fn write_page_tree(&mut self, page_tree_ref: Ref) { - let mut pages = self.writer.pages(page_tree_ref); + fn write_page_tree(&mut self) { + let mut pages = self.writer.pages(self.page_tree_ref); pages .count(self.page_refs.len() as i32) .kids(self.page_refs.iter().copied()); @@ -420,34 +396,36 @@ impl<'a> PdfExporter<'a> { pages.finish(); } - fn write_catalog(&mut self, page_tree_ref: Ref, languages: &HashMap<Lang, usize>) { + fn write_catalog(&mut self) { // Build the outline tree. - let outline_root_id = self.alloc.bump(); - + let outline_root_id = (!self.heading_tree.is_empty()).then(|| self.alloc.bump()); let outline_start_ref = self.alloc; + let len = self.heading_tree.len(); + let mut prev_ref = None; for (i, node) in std::mem::take(&mut self.heading_tree).iter().enumerate() { - self.write_outline_item( + prev_ref = Some(self.write_outline_item( node, - i == 0, - i + 1 == self.heading_tree.len(), - outline_root_id, - ); + outline_root_id.unwrap(), + prev_ref, + i + 1 == len, + )); } - if !self.heading_tree.is_empty() { + if let Some(outline_root_id) = outline_root_id { let mut outline_root = self.writer.outline(outline_root_id); outline_root.first(outline_start_ref); outline_root.last(Ref::new(self.alloc.get() - 1)); outline_root.count(self.heading_tree.len() as i32); } - let lang = languages - .into_iter() - .max_by(|(_, v1), (_, v2)| v1.cmp(v2)) - .map(|(k, _)| k); + let lang = self + .languages + .iter() + .max_by_key(|(&lang, &count)| (count, lang)) + .map(|(&k, _)| k); - let dir = if lang.copied().map(Lang::dir) == Some(Dir::RTL) { + let dir = if lang.map(Lang::dir) == Some(Dir::RTL) { Direction::R2L } else { Direction::L2R @@ -456,10 +434,10 @@ impl<'a> PdfExporter<'a> { // Write the document information, catalog and wrap it up! self.writer.document_info(self.alloc.bump()).creator(TextStr("Typst")); let mut catalog = self.writer.catalog(self.alloc.bump()); - catalog.pages(page_tree_ref); + catalog.pages(self.page_tree_ref); catalog.viewer_preferences().direction(dir); - if !self.heading_tree.is_empty() { + if let Some(outline_root_id) = outline_root_id { catalog.outlines(outline_root_id); } @@ -473,29 +451,28 @@ impl<'a> PdfExporter<'a> { fn write_outline_item( &mut self, node: &HeadingNode, - is_first: bool, - is_last: bool, parent_ref: Ref, - ) { + prev_ref: Option<Ref>, + is_last: bool, + ) -> Ref { let id = self.alloc.bump(); - let next = Ref::new(id.get() + node.len() as i32); + let next_ref = Ref::new(id.get() + node.len() as i32); let mut outline = self.writer.outline_item(id); outline.parent(parent_ref); if !is_last { - outline.next(next); + outline.next(next_ref); } - if !is_first { - outline.prev(Ref::new(id.get() - 1)); + if let Some(prev_rev) = prev_ref { + outline.prev(prev_rev); } if !node.children.is_empty() { let current_child = Ref::new(id.get() + 1); outline.first(current_child); - outline.last(Ref::new(next.get() - 1)); - + outline.last(Ref::new(next_ref.get() - 1)); outline.count(-1 * node.children.len() as i32); } @@ -508,36 +485,37 @@ impl<'a> PdfExporter<'a> { outline.finish(); - if !node.children.is_empty() { - for (i, child) in node.children.iter().enumerate() { - self.write_outline_item(child, i == 0, i + 1 == node.children.len(), id); - } + let mut prev_ref = None; + for (i, child) in node.children.iter().enumerate() { + prev_ref = Some(self.write_outline_item( + child, + id, + prev_ref, + i + 1 == node.children.len(), + )); } + + id } } /// An exporter for the contents of a single PDF page. -struct PageExporter<'a> { - fonts: &'a FontStore, - font_map: &'a mut Remapper<FaceId>, - image_map: &'a mut Remapper<ImageId>, - glyphs: &'a mut HashMap<FaceId, HashSet<u16>>, - heading_tree: &'a mut Vec<HeadingNode>, +struct PageExporter<'a, 'b> { + exporter: &'a mut PdfExporter<'b>, page_ref: Ref, - languages: HashMap<Lang, usize>, - bottom: f32, content: Content, - links: Vec<(Destination, Rect)>, state: State, saves: Vec<State>, + bottom: f32, + links: Vec<(Destination, Rect)>, } /// Data for an exported page. struct Page { + id: Ref, size: Size, content: Content, links: Vec<(Destination, Rect)>, - languages: HashMap<Lang, usize>, } /// A simulated graphics state used to deduplicate graphics state changes and @@ -573,7 +551,7 @@ impl HeadingNode { } fn len(&self) -> usize { - 1 + self.children.iter().map(|c| c.len()).sum::<usize>() + 1 + self.children.iter().map(Self::len).sum::<usize>() } fn insert(&mut self, other: Heading, level: usize) -> bool { @@ -581,32 +559,27 @@ impl HeadingNode { return false; } - if !self.children.is_empty() && level + 1 > other.level { - return self.children.last_mut().unwrap().insert(other, level + 1); + if let Some(child) = self.children.last_mut() { + if child.insert(other.clone(), level + 1) { + return true; + } } - self.children - .push(HeadingNode { heading: other, children: Vec::new() }); - + self.children.push(Self::leaf(other)); true } } -impl<'a> PageExporter<'a> { - fn new(exporter: &'a mut PdfExporter, page_ref: Ref) -> Self { +impl<'a, 'b> PageExporter<'a, 'b> { + fn new(exporter: &'a mut PdfExporter<'b>, page_ref: Ref) -> Self { Self { - fonts: exporter.fonts, - font_map: &mut exporter.face_map, - image_map: &mut exporter.image_map, - glyphs: &mut exporter.glyph_sets, - heading_tree: &mut exporter.heading_tree, + exporter, page_ref, - languages: HashMap::new(), - bottom: 0.0, content: Content::new(), - links: vec![], state: State::default(), saves: vec![], + bottom: 0.0, + links: vec![], } } @@ -625,8 +598,8 @@ impl<'a> PageExporter<'a> { Page { size: frame.size, content: self.content, + id: self.page_ref, links: self.links, - languages: self.languages, } } @@ -634,17 +607,17 @@ impl<'a> PageExporter<'a> { if let Some(Role::Heading(level)) = frame.role() { let heading = Heading { position: Point::new(self.state.transform.tx, self.state.transform.ty), - content: frame.inner_text(), + content: frame.text(), page: self.page_ref, level, }; - if let Some(last) = self.heading_tree.last_mut() { + if let Some(last) = self.exporter.heading_tree.last_mut() { if !last.insert(heading.clone(), 1) { - self.heading_tree.push(HeadingNode::leaf(heading)) + self.exporter.heading_tree.push(HeadingNode::leaf(heading)) } } else { - self.heading_tree.push(HeadingNode::leaf(heading)) + self.exporter.heading_tree.push(HeadingNode::leaf(heading)) } } @@ -684,13 +657,14 @@ impl<'a> PageExporter<'a> { } fn write_text(&mut self, x: f32, y: f32, text: &Text) { - *self.languages.entry(text.lang).or_insert(0) += text.glyphs.len(); - self.glyphs + *self.exporter.languages.entry(text.lang).or_insert(0) += text.glyphs.len(); + self.exporter + .glyph_sets .entry(text.face_id) .or_default() .extend(text.glyphs.iter().map(|g| g.id)); - let face = self.fonts.get(text.face_id); + let face = self.exporter.fonts.get(text.face_id); self.set_fill(text.fill); self.set_font(text.face_id, text.size); @@ -804,8 +778,8 @@ impl<'a> PageExporter<'a> { } fn write_image(&mut self, x: f32, y: f32, id: ImageId, size: Size) { - self.image_map.insert(id); - let name = format_eco!("Im{}", self.image_map.map(id)); + self.exporter.image_map.insert(id); + let name = format_eco!("Im{}", self.exporter.image_map.map(id)); let w = size.x.to_f32(); let h = size.y.to_f32(); self.content.save_state(); @@ -868,8 +842,8 @@ impl<'a> PageExporter<'a> { fn set_font(&mut self, face_id: FaceId, size: Length) { if self.state.font != Some((face_id, size)) { - self.font_map.insert(face_id); - let name = format_eco!("F{}", self.font_map.map(face_id)); + self.exporter.face_map.insert(face_id); + let name = format_eco!("F{}", self.exporter.face_map.map(face_id)); self.content.set_font(Name(name.as_bytes()), size.to_f32()); self.state.font = Some((face_id, size)); } |