1232 lines
54 KiB
Rust
1232 lines
54 KiB
Rust
//! Document → PDF (krilla). Mirrors the tree walk of `vectorcraft-render`.
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use std::collections::HashMap;
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use krilla::color::separation::{Color as SepColor, SeparationColorant, SeparationSpace};
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use krilla::color::{cmyk, luma, rgb};
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use krilla::configure::{Archival, ConfigurationBuilder, PdfVersion};
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use krilla::geom::{Path, PathBuilder, Size, Transform};
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use krilla::image::Image;
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use krilla::metadata::Metadata;
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use krilla::num::NormalizedF32;
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use krilla::page::PageSettings;
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use krilla::paint::{Fill, LinearGradient, RadialGradient, SpreadMethod, Stop, Stroke, StrokeDash};
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use krilla::surface::Surface;
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use kurbo::{PathEl, Shape, Vec2};
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use vectorcraft_color::{BlendMode, Color, GradientKind, Paint};
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use vectorcraft_doc::{AppearanceItem, Document, LineCap, LineJoin, Node, NodeKind, StrokeAlign, StrokeLayer, TextObject};
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use vectorcraft_effects::stroke::{self, WrittenShape};
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use vectorcraft_geom::{Affine, BezPath, FillRule, Rect};
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use crate::lab_spot::{find, rfind};
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use crate::marks::PageBoxes;
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use crate::{Compatibility, ExportReport, PdfError, PdfOptions, Standard};
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/// Export `doc` as PDF bytes: one page per artboard (or the artboards chosen in `opts`).
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pub fn export(doc: &Document, opts: &PdfOptions) -> Result<Vec<u8>, PdfError> {
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export_with_report(doc, opts).map(|r| r.bytes)
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}
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/// Like [`export`], also returning warnings: options accepted but not applied yet (see
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/// [`crate::PdfSettings::warnings`]) and features approximated or dropped.
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pub fn export_with_report(doc: &Document, opts: &PdfOptions) -> Result<ExportReport, PdfError> {
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let set = &opts.settings;
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set.check()?;
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// Live geometry effects export as their result; raster effects are reported below.
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let baked = vectorcraft_effects::bake_document(doc);
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let doc = baked.as_ref().unwrap_or(doc);
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if doc.artboards.is_empty() {
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return Err(PdfError::NoArtboards);
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}
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let indices: Vec<usize> = match &opts.artboards {
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Some(v) => v.clone(),
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None => (0..doc.artboards.len()).collect(),
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};
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if indices.is_empty() {
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return Err(PdfError::NoArtboards);
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}
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if let Some(bad) = indices.iter().find(|i| **i >= doc.artboards.len()) {
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return Err(PdfError::BadArtboard(*bad));
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}
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let title = opts.title.clone().unwrap_or_else(|| doc.title.clone());
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let created_at = opts.created.or_else(vectorcraft_doc::metadata::now_unix);
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let mut w = Writer::new(doc, set, &title, created_at, doc.color_mode == vectorcraft_doc::ColorMode::Cmyk)?;
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// Preserve Editing: the native document as an embedded file (`check` refused PDF/A with it).
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let mut warnings = set.warnings();
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let native = opts.native.as_deref().filter(|_| set.preserve_editing);
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if let Some(native) = native {
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w.pdf.embed_file(crate::editing::embedded_file(native, set.compression.compress_text, created_at.map(date_time)));
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} else if set.preserve_editing {
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warnings.push("Preserve editing needs the native document, which wasn't given: the PDF reopens as plain artwork".into());
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}
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let mut ex = Exporter::new(doc, set);
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ex.non_printing = set.include_non_printing || set.create_layers;
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// Marks and Bleeds: each page is its artboard (the trim box) grown by the bleed, and by the
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// printer's marks around that.
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let bleed = set.bleed_of(doc);
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let marks = set.marks.printer_marks();
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for i in indices {
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let boxes = PageBoxes::new(doc.artboards[i].rect, bleed, &marks);
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let (m, r) = (boxes.media, boxes.bleed);
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let info = if marks.page_info { crate::marks::page_info(doc, &title, i, created_at) } else { String::new() };
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let art = crate::marks::art(doc, &marks, &boxes, bleed, &info);
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// The page is the media box, y down from its top-left corner (like ours).
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let view = Affine::translate((-m.x0, -m.y0));
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let sheet = Sheet {
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size: (m.width(), m.height()),
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trim: view.transform_rect_bbox(boxes.trim),
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bleed: view.transform_rect_bbox(r),
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view,
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window: None,
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place: Affine::IDENTITY,
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area: r,
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// Art reaches as far as the bleed: the marks lie outside it.
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clip: m != r,
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marks: art.as_ref(),
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negative: false,
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};
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w.page(&mut ex, &sheet).map_err(|_| PdfError::BadArtboard(i))?;
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}
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w.absorb(ex);
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let (bytes, more) = w.finish()?;
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let bytes = if native.is_some() { crate::editing::seal(bytes)? } else { bytes };
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warnings.extend(more);
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warnings.dedup();
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Ok(ExportReport { bytes, warnings })
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}
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/// A PDF being written, shared by export and print: the file's configuration and metadata, then
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/// its pages ([`Self::page`]), each drawn by an [`Exporter`].
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pub(crate) struct Writer {
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pub pdf: krilla::Document,
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/// Groups blend in CMYK (a CMYK document's composite, see `cmyk_blending`).
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cmyk: bool,
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/// Spot colours written with a Lab alternate, gathered from the exporters ([`Self::absorb`]).
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lab_spots: Vec<(String, vectorcraft_color::cms::Lab)>,
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warnings: Vec<String>,
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}
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/// One page as [`Writer::page`] draws it: the art placed in a drawing space ([`Self::place`]),
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/// which [`Self::view`] maps onto the page.
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pub(crate) struct Sheet<'a> {
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/// The page's size in points.
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pub size: (f64, f64),
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/// The TrimBox and BleedBox, in page space (y down from the top-left corner).
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pub trim: Rect,
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pub bleed: Rect,
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/// Drawing space → page space.
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pub view: Affine,
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/// The part of the drawing space that shows (a tile): art and marks are clipped to it.
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pub window: Option<Rect>,
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/// Document space → drawing space.
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pub place: Affine,
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/// The art drawn, in document space (the bleed box): what lies outside it is left out.
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pub area: Rect,
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/// Clip the art to [`Self::area`].
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pub clip: bool,
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/// Printer's marks, in drawing space.
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pub marks: Option<&'a Node>,
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/// Invert the page: paper black, ink clear (a film negative).
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pub negative: bool,
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}
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impl Writer {
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/// A PDF with `set`'s version, standard and compression, and `doc`'s metadata under `title`,
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/// created at `created` (Unix seconds). With `cmyk`, transparency blends in CMYK.
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pub(crate) fn new(doc: &Document, set: &crate::PdfSettings, title: &str, created: Option<i64>, cmyk: bool) -> Result<Self, PdfError> {
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let version = match set.compatibility {
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Compatibility::Pdf14 => PdfVersion::Pdf14,
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Compatibility::Pdf15 => PdfVersion::Pdf15,
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Compatibility::Pdf16 => PdfVersion::Pdf16,
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Compatibility::Pdf17 => PdfVersion::Pdf17,
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Compatibility::Pdf20 => PdfVersion::Pdf20,
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};
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let mut cb = ConfigurationBuilder::new().with_version(version);
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// `check` has refused the standards (and standard/version pairs) the writer can't produce.
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if set.standard == Standard::PdfA2b {
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cb = cb.with_archival_validator(Archival::A2_B);
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}
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let configuration = cb.finish().map_err(|e| PdfError::Write(format!("{e:?}")))?;
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let settings = krilla::SerializeSettings { compress_content_streams: set.compression.compress_text, configuration, ..Default::default() };
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let mut pdf = krilla::Document::new_with(settings);
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let mut meta = Metadata::new().creator("VectorCraft".into()).producer("VectorCraft".into());
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if !title.is_empty() {
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meta = meta.title(title.to_string());
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}
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// File Info.
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let info = &doc.metadata;
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let given = |s: &str| Some(s.trim()).filter(|s| !s.is_empty()).map(str::to_string);
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if let Some(a) = given(&info.author) {
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meta = meta.authors(vec![a]);
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}
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if let Some(d) = given(&info.description) {
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meta = meta.description(d);
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}
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if !info.keywords.is_empty() {
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meta = meta.keywords(info.keywords.clone());
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}
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if let Some(t) = created.map(date_time) {
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meta = meta.creation_date(t);
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}
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pdf.set_metadata(meta);
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Ok(Self { pdf, cmyk, lab_spots: vec![], warnings: vec![] })
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}
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/// Draw one page: the art of `ex`'s document placed as `sheet` says, then its marks.
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pub(crate) fn page(&mut self, ex: &mut Exporter, sheet: &Sheet) -> Result<(), PdfError> {
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let (w, h) = sheet.size;
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let size = Size::from_wh(w.max(1.0) as f32, h.max(1.0) as f32).ok_or_else(|| PdfError::BadSetting(format!("page size {w} × {h}")))?;
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let at = |b: Rect| krilla::geom::Rect::from_ltrb(b.x0 as f32, b.y0 as f32, b.x1 as f32, b.y1 as f32);
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let mut page = self.pdf.start_page_with(PageSettings::new(size).with_trim_box(at(sheet.trim)).with_bleed_box(at(sheet.bleed)));
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let mut s = page.surface();
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let paper = Rect::new(0.0, 0.0, w, h);
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if sheet.negative {
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cover(&mut s, paper, 255, 1.0);
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}
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s.push_transform(&xf(sheet.view));
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let window = sheet.window.and_then(|r| to_path(&r.to_path(0.1)));
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if let Some(clip) = &window {
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s.push_clip_path(clip, &krilla::paint::FillRule::NonZero);
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}
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let placed = sheet.place != Affine::IDENTITY;
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if placed {
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s.push_transform(&xf(sheet.place));
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}
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let r = sheet.area;
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let clip = sheet.clip.then(|| to_path(&r.to_path(0.1))).flatten();
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if let Some(clip) = &clip {
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s.push_clip_path(clip, &krilla::paint::FillRule::NonZero);
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}
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// Page Isolated Blending / Page Knockout Group: the page content is one group (the PDF
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// writer has no page group attributes). In CMYK, transparency at the top of a page is put
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// in a non-isolated group of its own, whose blending space `cmyk_blending` rewrites.
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let doc = ex.doc;
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let page_group = doc.page_isolate || doc.page_knockout;
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let cmyk_page_group = self.cmyk && !page_group && ex.shows_transparency();
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if page_group {
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s.push_isolated();
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} else if cmyk_page_group {
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let all = constant_mask(&mut s, r, 1.0);
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s.push_mask(all);
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}
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ex.children(&mut s, &doc.layers, r);
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if page_group || cmyk_page_group {
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s.pop();
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}
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if clip.is_some() {
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s.pop();
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}
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if placed {
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s.pop();
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}
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if let Some(art) = sheet.marks {
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// The drawing space the page shows (the marks' area).
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let shown = sheet.view.inverse().transform_rect_bbox(paper);
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let knockout = std::mem::replace(&mut ex.knockout, false);
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ex.node(&mut s, art, sheet.window.map_or(shown, |r| r.intersect(shown)), true);
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ex.knockout = knockout;
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}
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if window.is_some() {
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s.pop();
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}
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s.pop();
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if sheet.negative {
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s.push_blend_mode(krilla::blend::BlendMode::Difference);
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cover(&mut s, paper, 255, 1.0);
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s.pop();
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}
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s.finish();
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page.finish();
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Ok(())
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}
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/// Take an exporter's warnings and Lab spot colours once its pages are drawn.
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pub(crate) fn absorb(&mut self, ex: Exporter) {
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for w in ex.warnings {
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if !self.warnings.contains(&w) {
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self.warnings.push(w);
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}
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}
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for spot in ex.lab_spots {
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if !self.lab_spots.iter().any(|(n, _)| *n == spot.0) {
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self.lab_spots.push(spot);
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}
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}
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}
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/// The finished file and the warnings of its drawing.
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pub(crate) fn finish(self) -> Result<(Vec<u8>, Vec<String>), PdfError> {
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let mut bytes = self.pdf.finish().map_err(|e| PdfError::Write(format!("{e:?}")))?;
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if self.cmyk {
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cmyk_blending(&mut bytes);
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}
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let bytes = if self.lab_spots.is_empty() { bytes } else { crate::lab_spot::lab_alternates(bytes, &self.lab_spots) };
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Ok((bytes, self.warnings))
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}
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}
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/// Make the transparency groups of `pdf` blend in DeviceCMYK. The PDF writer gives every group
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/// DeviceRGB as its blending space, so the group dictionaries are rewritten in place, keeping their
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/// length so the cross-reference offsets stay valid. Luminosity masks' groups keep RGB: mask
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/// luminance is that of screen colours, as on screen.
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fn cmyk_blending(pdf: &mut [u8]) {
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let masks = luminosity_mask_groups(pdf);
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let mut from = 0;
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while let Some(at) = find(pdf, b"/Group<<", from).map(|i| i + b"/Group".len()) {
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let end = find(pdf, b">>", at).map_or(pdf.len(), |i| i + 2);
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if !object_number(&pdf[..at]).is_some_and(|n| masks.contains(&n)) {
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cmyk_group(&mut pdf[at..end]);
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}
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from = end;
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}
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}
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/// Rewrite transparency group dictionary `dict` (`<<…>>`) to blend in DeviceCMYK, at the same
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/// length: leaving out the optional `/Type/Group` makes room for the longer name, spaces pad the
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/// rest.
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fn cmyk_group(dict: &mut [u8]) {
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let Ok(text) = std::str::from_utf8(dict) else { return };
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if !(text.contains("/S/Transparency") && text.contains("/Type/Group") && text.contains("/CS/DeviceRGB")) {
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return;
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}
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let body = text.replacen("/Type/Group", "", 1).replacen("/CS/DeviceRGB", "/CS/DeviceCMYK", 1);
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let body = body.strip_suffix(">>").unwrap_or(&body);
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let new = format!("{body}{}>>", " ".repeat(dict.len() - body.len() - 2));
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dict.copy_from_slice(new.as_bytes());
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}
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/// Object numbers of the groups luminosity soft masks draw (`/G n 0 R` in their dictionaries).
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fn luminosity_mask_groups(pdf: &[u8]) -> Vec<u32> {
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let mut out = vec![];
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let mut from = 0;
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while let Some(at) = find(pdf, b"/Type/Mask", from) {
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let end = find(pdf, b">>", at).unwrap_or(pdf.len());
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let dict = &pdf[at..end];
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if find(dict, b"/S/Luminosity", 0).is_some()
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&& let Some(g) = find(dict, b"/G ", 0)
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{
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let rest = &dict[g + 3..];
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out.extend(number(&rest[..rest.iter().take_while(|b| b.is_ascii_digit()).count()]));
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}
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from = end;
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}
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out
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}
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/// The number of the object whose dictionary `before` ends in (its last `n 0 obj` header).
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fn object_number(before: &[u8]) -> Option<u32> {
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let at = rfind(before, b" 0 obj")?;
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let digits = before[..at].iter().rev().take_while(|b| b.is_ascii_digit()).count();
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number(&before[at - digits..at])
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}
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fn number(digits: &[u8]) -> Option<u32> {
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std::str::from_utf8(digits).ok()?.parse().ok()
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}
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/// Unix seconds (UTC) → krilla date.
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fn date_time(t: i64) -> krilla::metadata::DateTime {
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let [year, month, day, hour, minute, second] = vectorcraft_doc::metadata::civil(t);
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krilla::metadata::DateTime::new(year as u16)
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.month(month as u8)
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.day(day as u8)
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.hour(hour as u8)
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.minute(minute as u8)
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.second(second as u8)
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.utc_offset_hour(0)
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.utc_offset_minute(0)
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}
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pub(crate) struct Exporter<'a> {
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doc: &'a Document,
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warnings: Vec<String>,
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images: HashMap<String, Option<Image>>,
|
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/// The brush library, parsed when the first brushed stroke is written.
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brushes: Option<Vec<vectorcraft_brush::Brush>>,
|
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/// Whether the group being written is a knockout group (what its neutral children inherit).
|
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knockout: bool,
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/// Spot colours written with a Lab alternate ([`crate::lab_spot`]): colorant name, Lab values.
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lab_spots: Vec<(String, vectorcraft_color::cms::Lab)>,
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/// Images may ask viewers to smooth them (not in PDF/A).
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interpolate: bool,
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/// How images are resampled and compressed.
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compression: &'a crate::CompressionSettings,
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/// Layers whose Print option is off are written too.
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pub non_printing: bool,
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/// How colours are separated into CMYK (the colour settings' intent unless print sets one).
|
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pub intent: vectorcraft_color::cms::Intent,
|
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/// Whether a layer shows transparency (found out on the first page that asks).
|
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transparent: Option<bool>,
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}
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impl<'a> Exporter<'a> {
|
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/// An exporter of `doc` writing images as `set` says; layers whose Print option is off are
|
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/// left out.
|
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pub(crate) fn new(doc: &'a Document, set: &'a crate::PdfSettings) -> Self {
|
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Self {
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doc,
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warnings: vec![],
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images: HashMap::new(),
|
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brushes: None,
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knockout: doc.page_knockout,
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lab_spots: vec![],
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interpolate: set.standard != Standard::PdfA2b,
|
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compression: &set.compression,
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non_printing: false,
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intent: vectorcraft_color::cms::active().settings().intent,
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transparent: None,
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}
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}
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|
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/// Whether a layer shows transparency, which CMYK pages put in a group of its own.
|
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fn shows_transparency(&mut self) -> bool {
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let doc = self.doc;
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*self.transparent.get_or_insert_with(|| doc.layers.iter().any(|l| l.shows_transparency()))
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}
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}
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|
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/// Most pixels along a side of a freeform gradient's image (its colour field is smooth).
|
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const MAX_FIELD_PX: f64 = 512.0;
|
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|
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fn xf(a: Affine) -> Transform {
|
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let c = a.as_coeffs();
|
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Transform::from_row(c[0] as f32, c[1] as f32, c[2] as f32, c[3] as f32, c[4] as f32, c[5] as f32)
|
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}
|
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|
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fn to_path(bp: &BezPath) -> Option<Path> {
|
||
let mut pb = PathBuilder::new();
|
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for el in bp.elements() {
|
||
match *el {
|
||
PathEl::MoveTo(p) => pb.move_to(p.x as f32, p.y as f32),
|
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PathEl::LineTo(p) => pb.line_to(p.x as f32, p.y as f32),
|
||
PathEl::QuadTo(a, p) => pb.quad_to(a.x as f32, a.y as f32, p.x as f32, p.y as f32),
|
||
PathEl::CurveTo(a, b, p) => pb.cubic_to(a.x as f32, a.y as f32, b.x as f32, b.y as f32, p.x as f32, p.y as f32),
|
||
PathEl::ClosePath => pb.close(),
|
||
}
|
||
}
|
||
pb.finish()
|
||
}
|
||
|
||
fn norm(v: f32) -> NormalizedF32 {
|
||
NormalizedF32::new(if v.is_finite() { v.clamp(0.0, 1.0) } else { 1.0 }).unwrap_or(NormalizedF32::ONE)
|
||
}
|
||
|
||
fn rule(r: FillRule) -> krilla::paint::FillRule {
|
||
match r {
|
||
FillRule::NonZero => krilla::paint::FillRule::NonZero,
|
||
FillRule::EvenOdd => krilla::paint::FillRule::EvenOdd,
|
||
}
|
||
}
|
||
|
||
fn blend(b: BlendMode) -> krilla::blend::BlendMode {
|
||
use krilla::blend::BlendMode as K;
|
||
match b {
|
||
BlendMode::Normal => K::Normal,
|
||
BlendMode::Darken => K::Darken,
|
||
BlendMode::Multiply => K::Multiply,
|
||
BlendMode::ColorBurn => K::ColorBurn,
|
||
BlendMode::Lighten => K::Lighten,
|
||
BlendMode::Screen => K::Screen,
|
||
BlendMode::ColorDodge => K::ColorDodge,
|
||
BlendMode::Overlay => K::Overlay,
|
||
BlendMode::SoftLight => K::SoftLight,
|
||
BlendMode::HardLight => K::HardLight,
|
||
BlendMode::Difference => K::Difference,
|
||
BlendMode::Exclusion => K::Exclusion,
|
||
BlendMode::Hue => K::Hue,
|
||
BlendMode::Saturation => K::Saturation,
|
||
BlendMode::Color => K::Color,
|
||
BlendMode::Luminosity => K::Luminosity,
|
||
}
|
||
}
|
||
|
||
fn q(v: f32) -> u8 {
|
||
(v.clamp(0.0, 1.0) * 255.0).round() as u8
|
||
}
|
||
|
||
fn color(c: &Color) -> krilla::color::Color {
|
||
match *c {
|
||
Color::Rgb { r, g, b } => rgb::Color::new(q(r), q(g), q(b)).into(),
|
||
Color::Cmyk { c, m, y, k } => cmyk::Color::new(q(c), q(m), q(y), q(k)).into(),
|
||
// VectorCraft grey is ink coverage (0 = white); PDF DeviceGray is lightness.
|
||
Color::Gray { k } => luma::Color::new(q(1.0 - k)).into(),
|
||
Color::Lab { .. } => {
|
||
let [r, g, b] = c.to_rgb();
|
||
rgb::Color::new(q(r), q(g), q(b)).into()
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Fill the page (with a margin) with a grey level (0 = black, 255 = white) at `opacity`: mask
|
||
/// backdrops.
|
||
fn cover(s: &mut Surface, page: Rect, level: u8, opacity: f32) {
|
||
let Some(p) = to_path(&page.inflate(1.0, 1.0).to_path(0.1)) else { return };
|
||
s.set_stroke(None);
|
||
s.set_fill(Some(Fill { paint: rgb::Color::new(level, level, level).into(), opacity: norm(opacity), rule: krilla::paint::FillRule::NonZero }));
|
||
s.draw_path(&p);
|
||
}
|
||
|
||
/// An alpha mask of constant `alpha` over the page. A group drawn through it is a transparency
|
||
/// group of that opacity that, unlike the writer's opacity groups, is not isolated.
|
||
fn constant_mask(s: &mut Surface, page: Rect, alpha: f32) -> krilla::mask::Mask {
|
||
let mut sb = s.stream_builder();
|
||
let mut ms = sb.surface();
|
||
cover(&mut ms, page, 0, alpha);
|
||
ms.finish();
|
||
krilla::mask::Mask::new(sb.finish(), krilla::mask::MaskType::Alpha)
|
||
}
|
||
|
||
fn rects_overlap(a: Rect, b: Rect) -> bool {
|
||
a.x0 <= b.x1 && b.x0 <= a.x1 && a.y0 <= b.y1 && b.y0 <= a.y1
|
||
}
|
||
|
||
impl Exporter<'_> {
|
||
/// A colour for the page: in CMYK documents RGB and Lab colours are separated into DeviceCMYK
|
||
/// through the active colour settings, so the file carries press values.
|
||
fn col(&mut self, c: &Color) -> krilla::color::Color {
|
||
if self.doc.color_mode == vectorcraft_doc::ColorMode::Cmyk && matches!(c, Color::Rgb { .. } | Color::Lab { .. }) {
|
||
let [cc, m, y, k] = vectorcraft_color::cms::active().to_cmyk(c, self.intent);
|
||
return cmyk::Color::new(q(cc), q(m), q(y), q(k)).into();
|
||
}
|
||
color(c)
|
||
}
|
||
|
||
/// The Separation colour space of spot swatch `name` (its CMYK equivalent is the alternate
|
||
/// space; a Lab spot colour also gets a Lab one, [`crate::lab_spot`], unless the Spot Colors
|
||
/// options use CMYK values); `None` when `name` isn't a spot colour.
|
||
fn separation(&mut self, name: &str) -> Option<SeparationSpace> {
|
||
let doc = self.doc;
|
||
let sw = doc.swatch(name).filter(|s| s.spot)?;
|
||
let color = doc.linked_color(sw.paint.color()?, true);
|
||
if let Color::Lab { l, a, b } = color
|
||
&& !self.lab_spots.iter().any(|(n, _)| n == name)
|
||
{
|
||
self.lab_spots.push((name.to_string(), vectorcraft_color::cms::Lab::new(l, a, b)));
|
||
}
|
||
let full = vectorcraft_color::cms::active().to_cmyk(&color, self.intent);
|
||
let alt = krilla::color::RegularColor::Cmyk(cmyk::Color::new(q(full[0]), q(full[1]), q(full[2]), q(full[3])));
|
||
Some(SeparationSpace::new(SeparationColorant::Custom(sw.name.clone()), alt))
|
||
}
|
||
|
||
/// A solid paint, in the Separation colour space at its tint when it's linked to a spot swatch
|
||
/// or to Registration (`/All`: every plate).
|
||
fn solid(&mut self, c: &Color, link: Option<&str>, tint: f32) -> krilla::color::Color {
|
||
if link == Some(vectorcraft_color::swatch::REGISTRATION) {
|
||
let alt = krilla::color::RegularColor::Cmyk(cmyk::Color::new(255, 255, 255, 255));
|
||
return SepColor::new(q(tint), SeparationSpace::new(SeparationColorant::AllColorants, alt)).into();
|
||
}
|
||
match link.and_then(|n| self.separation(n)) {
|
||
Some(space) => SepColor::new(q(tint), space).into(),
|
||
None => self.col(c),
|
||
}
|
||
}
|
||
|
||
/// The stops of a gradient whose every stop is a tint of one spot ink (or paper white, 0% of
|
||
/// it) as tints of that ink — a Separation shading — with midpoints as explicit stops (the
|
||
/// tint and opacity there are halfway). `None` for other gradients; one that mixes a spot ink
|
||
/// with other colours is written in process colours (the PDF writer has no DeviceN).
|
||
fn spot_stops(&mut self, g: &vectorcraft_color::Gradient) -> Option<Vec<(f32, krilla::color::Color, f32)>> {
|
||
let ink = g.stops.iter().find_map(|s| s.swatch.as_deref().filter(|n| self.doc.swatch(n).is_some_and(|w| w.spot)))?;
|
||
let paper = |c: &Color| c.to_rgba8(1.0)[..3] == [255; 3];
|
||
let tints: Option<Vec<f32>> = g
|
||
.stops
|
||
.iter()
|
||
.map(|s| match s.swatch.as_deref() {
|
||
Some(n) if n == ink => Some(s.tint),
|
||
None if paper(&s.color) => Some(0.0),
|
||
_ => None,
|
||
})
|
||
.collect();
|
||
let Some(tints) = tints else {
|
||
self.warn("gradients mixing a spot color with other colors are exported in process colors");
|
||
return None;
|
||
};
|
||
let space = self.separation(ink)?;
|
||
let tint = |t: f32| -> krilla::color::Color { SepColor::new(q(t), space.clone()).into() };
|
||
let mut out = vec![];
|
||
for (i, s) in g.stops.iter().enumerate() {
|
||
out.push((s.offset, tint(tints[i]), s.opacity));
|
||
if let Some(n) = g.stops.get(i + 1)
|
||
&& (s.midpoint - 0.5).abs() > 1e-3
|
||
{
|
||
let at = s.offset + (n.offset - s.offset) * s.midpoint;
|
||
out.push((at, tint((tints[i] + tints[i + 1]) / 2.0), (s.opacity + n.opacity) / 2.0));
|
||
}
|
||
}
|
||
Some(out)
|
||
}
|
||
|
||
/// Warn when `effects` (an object's, a fill's or a stroke's) has a visible raster effect: the
|
||
/// app renders them to images before export (`vectorcraft_engine::export_pdf`), so the ones
|
||
/// still here (on `what`) can't be written.
|
||
fn warn_raster(&mut self, effects: &[vectorcraft_doc::Effect], what: impl FnOnce() -> String) {
|
||
if effects.iter().any(|e| e.visible && vectorcraft_effects::is_raster(&e.id)) {
|
||
self.warn(format!("raster effects (shadows, glows, blur, feather) on {} are left out of the PDF", what()));
|
||
}
|
||
}
|
||
|
||
fn warn(&mut self, w: impl Into<String>) {
|
||
let w = w.into();
|
||
if !self.warnings.contains(&w) {
|
||
self.warnings.push(w);
|
||
}
|
||
}
|
||
|
||
/// Convert a paint. `bounds` resolves unset gradient geometry (like the renderer).
|
||
fn paint(&mut self, p: &Paint, bounds: Rect) -> Option<krilla::paint::Paint> {
|
||
match p {
|
||
Paint::None => None,
|
||
Paint::Solid { color: c, swatch, tint } => Some(self.solid(c, swatch.as_deref(), *tint).into()),
|
||
Paint::Gradient(g) => {
|
||
let geom = g.resolve(bounds);
|
||
let spot = (g.gradient.kind != GradientKind::Freeform).then(|| self.spot_stops(&g.gradient)).flatten();
|
||
let colored = match spot {
|
||
Some(v) => v,
|
||
None => {
|
||
let stops = g.gradient.expanded_stops();
|
||
// The PDF writer needs every stop in one colour space: stops of mixed
|
||
// models (midpoints sample in RGB) go through RGB, or stay CMYK in a CMYK
|
||
// document, where `col` separates the rest.
|
||
let mixed = stops.windows(2).any(|w| w[0].1.model() != w[1].1.model());
|
||
let cmyk_doc = self.doc.color_mode == vectorcraft_doc::ColorMode::Cmyk;
|
||
let one = |c: Color| match c {
|
||
Color::Cmyk { .. } if cmyk_doc => c,
|
||
_ if mixed => c.in_model(vectorcraft_color::cms::Model::Rgb),
|
||
_ => c,
|
||
};
|
||
stops.into_iter().map(|(o, c, a)| (o, self.col(&one(c)), a)).collect()
|
||
}
|
||
};
|
||
let mut stops: Vec<Stop> = Vec::new();
|
||
let mut last = 0.0f32;
|
||
for (o, color, a) in colored {
|
||
let o = o.clamp(last, 1.0);
|
||
last = o;
|
||
stops.push(Stop { offset: norm(o), color, opacity: norm(a) });
|
||
}
|
||
if stops.is_empty() {
|
||
return None;
|
||
}
|
||
match g.gradient.kind {
|
||
GradientKind::Linear => {
|
||
let (s, mut e) = (geom.start, geom.end);
|
||
if s.distance(e) < 1e-9 {
|
||
e = s + Vec2::new(1.0, 0.0);
|
||
}
|
||
Some(
|
||
LinearGradient {
|
||
x1: s.x as f32,
|
||
y1: s.y as f32,
|
||
x2: e.x as f32,
|
||
y2: e.y as f32,
|
||
transform: Transform::identity(),
|
||
spread_method: SpreadMethod::Pad,
|
||
stops,
|
||
anti_alias: false,
|
||
}
|
||
.into(),
|
||
)
|
||
}
|
||
GradientKind::Radial => {
|
||
let r = geom.length().max(1e-6) as f32;
|
||
let t = geom.radial_squash();
|
||
let (cx, cy) = (geom.start.x as f32, geom.start.y as f32);
|
||
// An off-centre focal point: a two-point radial shading from it.
|
||
let f = t.inverse() * geom.focal_point();
|
||
Some(
|
||
RadialGradient {
|
||
fx: f.x as f32,
|
||
fy: f.y as f32,
|
||
fr: 0.0,
|
||
cx,
|
||
cy,
|
||
cr: r,
|
||
transform: xf(t),
|
||
spread_method: SpreadMethod::Pad,
|
||
stops,
|
||
anti_alias: false,
|
||
}
|
||
.into(),
|
||
)
|
||
}
|
||
// Painted areas get an image of the field ([`Self::area`]); elsewhere (gradient
|
||
// slices) the average colour stands in.
|
||
GradientKind::Freeform => {
|
||
self.warn("freeform gradients are exported as their average colour");
|
||
let n = g.gradient.stops.len().max(1) as f32;
|
||
let mut acc = [0.0f32; 3];
|
||
for s in &g.gradient.stops {
|
||
let c = s.color.to_rgb();
|
||
for i in 0..3 {
|
||
acc[i] += c[i] / n;
|
||
}
|
||
}
|
||
Some(color(&Color::rgb(acc[0], acc[1], acc[2])).into())
|
||
}
|
||
}
|
||
}
|
||
// Patterns paint through [`Self::area`]: only a missing one gets here.
|
||
Paint::Pattern { .. } => {
|
||
self.warn("missing patterns are exported as mid-grey");
|
||
Some(rgb::Color::new(128, 128, 128).into())
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Opacity mask → luminosity soft mask. Outside the art the backdrop is black (clip) or white;
|
||
/// invert is a white Difference rect on top (luminance is linear, so luma(1 − c) = 1 − luma(c)).
|
||
fn soft_mask(&mut self, s: &mut Surface, m: &vectorcraft_doc::OpacityMask, page: Rect) -> krilla::mask::Mask {
|
||
let mut sb = s.stream_builder();
|
||
let mut ms = sb.surface();
|
||
// An opaque backdrop when it matters: white outside the art (no clip), or black for the
|
||
// inverting Difference pass below to turn white.
|
||
if !m.clip || m.invert {
|
||
cover(&mut ms, page, if m.clip { 0 } else { 255 }, 1.0);
|
||
}
|
||
// Mask art is a picture of its own: it takes no part in a knockout group around the object.
|
||
let knockout = std::mem::take(&mut self.knockout);
|
||
self.node(&mut ms, &m.art, page, true);
|
||
self.knockout = knockout;
|
||
if m.invert {
|
||
ms.push_blend_mode(krilla::blend::BlendMode::Difference);
|
||
cover(&mut ms, page, 255, 1.0);
|
||
ms.pop();
|
||
}
|
||
ms.finish();
|
||
krilla::mask::Mask::new(sb.finish(), krilla::mask::MaskType::Luminosity)
|
||
}
|
||
|
||
/// The children of a group, as the elements of a knockout group when it is one.
|
||
fn children(&mut self, s: &mut Surface, children: &[std::sync::Arc<Node>], page: Rect) {
|
||
if !self.knockout {
|
||
for c in children {
|
||
self.node(s, c, page, false);
|
||
}
|
||
return;
|
||
}
|
||
// The PDF writer has no knockout groups: each element is drawn through a soft mask of
|
||
// where the elements above it don't paint (the same look for Normal blending). The masks
|
||
// nest, so element i sits inside the masks of elements i+1…n: open them outermost first.
|
||
self.warn("knockout groups are written as soft-masked groups (same look, but not editable as knockout groups)");
|
||
let elements: Vec<_> = Node::knockout_elements(children)
|
||
.into_iter()
|
||
.filter(|c| c.visual_bounds().is_some_and(|b| rects_overlap(b.inflate(1.0, 1.0), page)))
|
||
.collect();
|
||
let Some((first, rest)) = elements.split_first() else { return };
|
||
for c in rest.iter().rev() {
|
||
let mask = self.knockout_mask(s, c, page);
|
||
s.push_mask(mask);
|
||
}
|
||
self.node(s, first, page, false);
|
||
for c in rest {
|
||
s.pop();
|
||
self.node(s, c, page, false);
|
||
}
|
||
}
|
||
|
||
/// A luminosity mask that is 1 − the knockout shape of `c`: white, then black through an alpha
|
||
/// mask of `c` (at full object opacity without its own mask, unless those define its shape).
|
||
fn knockout_mask(&mut self, s: &mut Surface, c: &Node, page: Rect) -> krilla::mask::Mask {
|
||
let shape = if c.knockout_shape { c.clone() } else { Node { opacity: 1.0, mask: None, ..c.clone() } };
|
||
let mut sb = s.stream_builder();
|
||
let mut ms = sb.surface();
|
||
cover(&mut ms, page, 255, 1.0);
|
||
let alpha = {
|
||
let mut ab = ms.stream_builder();
|
||
let mut als = ab.surface();
|
||
self.node(&mut als, &shape, page, false);
|
||
als.finish();
|
||
krilla::mask::Mask::new(ab.finish(), krilla::mask::MaskType::Alpha)
|
||
};
|
||
ms.push_mask(alpha);
|
||
cover(&mut ms, page, 0, 1.0);
|
||
ms.pop();
|
||
ms.finish();
|
||
krilla::mask::Mask::new(sb.finish(), krilla::mask::MaskType::Luminosity)
|
||
}
|
||
|
||
fn node(&mut self, s: &mut Surface, n: &Node, page: Rect, force: bool) {
|
||
if !force && !n.visible {
|
||
return;
|
||
}
|
||
if let NodeKind::Layer { template, printable, .. } = n.kind
|
||
&& (template || !(printable || self.non_printing))
|
||
{
|
||
return;
|
||
}
|
||
match n.visual_bounds() {
|
||
Some(b) if !force && !rects_overlap(b.inflate(1.0, 1.0), page) => return,
|
||
None if !n.is_container() => return,
|
||
_ => {}
|
||
}
|
||
self.warn_raster(&n.appearance.effects, || format!("{} objects", n.kind_label().to_lowercase()));
|
||
let container = n.is_container() && !matches!(n.kind, NodeKind::Compound { .. });
|
||
// Whether this container's children knock each other out (a knockout group is written as a group).
|
||
let knockout = n.knocks_out(self.knockout);
|
||
let enclosing = std::mem::replace(&mut self.knockout, knockout);
|
||
let mut pushes = 0;
|
||
if n.blend != BlendMode::Normal {
|
||
s.push_blend_mode(blend(n.blend));
|
||
pushes += 1;
|
||
}
|
||
if n.opacity < 1.0 || (container && (n.isolate || n.blend != BlendMode::Normal || knockout)) {
|
||
if !n.isolate && n.blends_through() {
|
||
// Not isolated: blending inside reaches the art below the group.
|
||
let alpha = constant_mask(s, page, n.opacity);
|
||
s.push_mask(alpha);
|
||
} else if n.opacity < 1.0 {
|
||
s.push_opacity(norm(n.opacity));
|
||
} else {
|
||
s.push_isolated();
|
||
}
|
||
pushes += 1;
|
||
}
|
||
if let Some(m) = n.mask.as_deref()
|
||
&& !m.disabled
|
||
{
|
||
let mask = self.soft_mask(s, m, page);
|
||
s.push_mask(mask);
|
||
pushes += 1;
|
||
}
|
||
match &n.kind {
|
||
NodeKind::Layer { children, clip: false, .. } | NodeKind::Group { children, clip: false } => self.children(s, children, page),
|
||
NodeKind::Group { children, clip: true } | NodeKind::Layer { children, clip: true, .. } => {
|
||
// The region every output clips to; nothing to clip by hides the clipped art. The
|
||
// clipping path's fill paints behind the clipped art and its stroke over it, unclipped.
|
||
if let Some((clip, rest)) = children.split_first()
|
||
&& let Some((p, r)) = vectorcraft_effects::clip_outline(clip).and_then(|(bp, r)| to_path(&bp).map(|p| (p, r)))
|
||
{
|
||
let paint = clip.clip_paint();
|
||
s.push_clip_path(&p, &rule(r));
|
||
if let Some(fill) = &paint.fill {
|
||
self.node(s, fill, page, false);
|
||
}
|
||
self.children(s, rest, page);
|
||
s.pop();
|
||
if let Some(stroke) = &paint.stroke {
|
||
self.node(s, stroke, page, false);
|
||
}
|
||
}
|
||
}
|
||
NodeKind::Path { path, rule, guide, .. } => {
|
||
if !*guide {
|
||
self.shape(s, n, &path.to_bezpath(), *rule, page);
|
||
}
|
||
}
|
||
NodeKind::Compound { children, rule } => {
|
||
let mut bp = BezPath::new();
|
||
for c in children {
|
||
if let Some(p) = c.path_data() {
|
||
bp.extend(p.to_bezpath());
|
||
}
|
||
}
|
||
self.shape(s, n, &bp, *rule, page);
|
||
}
|
||
NodeKind::Text(t) => self.text(s, n, t, page),
|
||
NodeKind::Image(im) => self.image(s, im),
|
||
NodeKind::SymbolInstance { symbol, xf } => {
|
||
if let Some(sym) = self.doc.symbols.iter().find(|x| &x.name == symbol) {
|
||
let mut art = (*sym.art).clone();
|
||
art.transform(*xf, false);
|
||
self.node(s, &art, page, true);
|
||
}
|
||
}
|
||
// Live blends/envelopes/meshes export their evaluated (expanded) form.
|
||
NodeKind::Blend { .. } | NodeKind::Envelope { .. } | NodeKind::Mesh(_) | NodeKind::Repeat(_) => {
|
||
let g = vectorcraft_doc::live::expand_deep(n, None);
|
||
for c in g.children().into_iter().flatten() {
|
||
self.node(s, c, page, false);
|
||
}
|
||
}
|
||
}
|
||
self.knockout = enclosing;
|
||
for _ in 0..pushes {
|
||
s.pop();
|
||
}
|
||
}
|
||
|
||
fn shape(&mut self, s: &mut Surface, n: &Node, bp: &BezPath, r: FillRule, page: Rect) {
|
||
let Some(path) = to_path(bp) else { return };
|
||
let bounds = bp.bounding_box();
|
||
for item in &n.appearance.items {
|
||
match item {
|
||
AppearanceItem::Fill(fl) => {
|
||
if !fl.visible || fl.paint.is_none() {
|
||
continue;
|
||
}
|
||
self.warn_raster(&fl.effects, || "fills".into());
|
||
if self.area(s, &path, rule(r), &fl.paint, (fl.opacity, fl.blend), bounds, bounds) {
|
||
continue;
|
||
}
|
||
let Some(paint) = self.paint(&fl.paint, bounds) else { continue };
|
||
let bl = fl.blend != BlendMode::Normal;
|
||
if bl {
|
||
s.push_blend_mode(blend(fl.blend));
|
||
}
|
||
s.set_stroke(None);
|
||
s.set_fill(Some(Fill { paint, opacity: norm(fl.opacity), rule: rule(r) }));
|
||
s.draw_path(&path);
|
||
if bl {
|
||
s.pop();
|
||
}
|
||
}
|
||
AppearanceItem::Stroke(st) => {
|
||
if !st.visible || st.paint.is_none() || st.width <= 0.0 {
|
||
continue;
|
||
}
|
||
self.warn_raster(&st.effects, || "strokes".into());
|
||
self.stroke(s, bp, &path, r, st, page, bounds);
|
||
}
|
||
}
|
||
}
|
||
s.set_fill(None);
|
||
s.set_stroke(None);
|
||
}
|
||
|
||
/// Is `p` a paint PDF has no paint for, which [`Self::area`] draws as art: a pattern swatch or
|
||
/// a freeform gradient?
|
||
fn area_paint(&self, p: &Paint) -> bool {
|
||
match p {
|
||
Paint::Pattern { pattern, .. } => self.doc.pattern(pattern).is_some(),
|
||
Paint::Gradient(g) => g.gradient.kind == GradientKind::Freeform,
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
/// Paint the area `clip` (filled by `rule`; bounds `area`) with `p` at `transparency` (opacity,
|
||
/// blend mode) when it is an [area paint](Self::area_paint): a pattern's tile instances
|
||
/// covering it, or an image of a freeform gradient placed on `bounds` (the painted object's
|
||
/// box, as on the canvas), clipped to it. False (nothing drawn) for other paints.
|
||
#[allow(clippy::too_many_arguments)]
|
||
fn area(
|
||
&mut self,
|
||
s: &mut Surface,
|
||
clip: &Path,
|
||
rule: krilla::paint::FillRule,
|
||
p: &Paint,
|
||
transparency: (f32, BlendMode),
|
||
bounds: Rect,
|
||
area: Rect,
|
||
) -> bool {
|
||
if !self.area_paint(p) {
|
||
return false;
|
||
}
|
||
let (opacity, mode) = transparency;
|
||
let mut pushes = 0;
|
||
if mode != BlendMode::Normal {
|
||
s.push_blend_mode(blend(mode));
|
||
pushes += 1;
|
||
}
|
||
s.push_clip_path(clip, &rule);
|
||
pushes += 1;
|
||
if opacity < 1.0 {
|
||
s.push_opacity(norm(opacity));
|
||
pushes += 1;
|
||
}
|
||
let doc = self.doc;
|
||
match p {
|
||
Paint::Pattern { pattern, xf } => {
|
||
for inst in doc.pattern(pattern).map(|def| def.instances_in(*xf, area)).unwrap_or_default() {
|
||
self.node(s, &inst, area, true);
|
||
}
|
||
}
|
||
Paint::Gradient(g) => self.field_image(s, g, bounds, area),
|
||
_ => {}
|
||
}
|
||
for _ in 0..pushes {
|
||
s.pop();
|
||
}
|
||
true
|
||
}
|
||
|
||
/// Draw freeform gradient `g`, placed on `bounds`, as an image of its colour field over `area`,
|
||
/// sampled at the document's raster effects resolution (at most [`MAX_FIELD_PX`] a side).
|
||
fn field_image(&mut self, s: &mut Surface, g: &vectorcraft_color::GradientPaint, bounds: Rect, area: Rect) {
|
||
use vectorcraft_color::freeform::{painted_box, spread_scale};
|
||
let Some(b) = painted_box(bounds) else { return };
|
||
let area = area.abs();
|
||
let long = area.width().max(area.height());
|
||
if !(long > 1e-9 && long.is_finite()) {
|
||
return;
|
||
}
|
||
let k = (self.doc.raster_effects_ppi / 72.0).min(MAX_FIELD_PX / long);
|
||
let along = |len: f64| (len * k).ceil().clamp(1.0, MAX_FIELD_PX) as u16;
|
||
let (cols, rows) = (along(area.width()), along(area.height()));
|
||
let field = g.freeform_on(b).field_with(spread_scale(b), &|c| c.to_rgb());
|
||
let rgba: Vec<u8> = field.grid(area, cols, rows).flat_map(|(c, a)| [q(c[0]), q(c[1]), q(c[2]), q(a)]).collect();
|
||
let (Some(img), Some(size)) =
|
||
(crate::images::from_rgba(&rgba, cols.into(), rows.into(), self.interpolate), Size::from_wh(area.width() as f32, area.height() as f32))
|
||
else {
|
||
return;
|
||
};
|
||
s.push_transform(&xf(Affine::translate(area.origin().to_vec2())));
|
||
s.draw_image(img, size);
|
||
s.pop();
|
||
}
|
||
|
||
/// Paint stroke `st` of the shape `bp` (`path`), whose geometric bounds `bounds` place its
|
||
/// unplaced gradients.
|
||
#[allow(clippy::too_many_arguments)]
|
||
fn stroke(&mut self, s: &mut Surface, bp: &BezPath, path: &Path, r: FillRule, st: &StrokeLayer, page: Rect, bounds: Rect) {
|
||
if !stroke::is_plain(st) && self.brush_art(s, bp, st, page) {
|
||
return;
|
||
}
|
||
if self.area_paint(&st.paint) {
|
||
// The area the stroke paints (dashes, caps, joins, profile, arrowheads, alignment), as
|
||
// Outline Stroke makes it, painted with the pattern's tiles or the freeform's image.
|
||
let region = stroke::outline_region(&vectorcraft_geom::PathData::from_bezpath(bp), r, st).to_bezpath();
|
||
if let Some(clip) = to_path(®ion) {
|
||
let area = region.bounding_box();
|
||
self.area(s, &clip, krilla::paint::FillRule::NonZero, &st.paint, (st.opacity, st.blend), st.paint_bounds(bounds), area);
|
||
}
|
||
return;
|
||
}
|
||
let Some(paint) = self.paint(&st.paint, st.paint_bounds(bounds)) else { return };
|
||
let w = stroke::for_writer(bp, st);
|
||
let mut pushes = 0;
|
||
if st.blend != BlendMode::Normal {
|
||
s.push_blend_mode(blend(st.blend));
|
||
pushes += 1;
|
||
}
|
||
match w.side {
|
||
Some(StrokeAlign::Inside) => {
|
||
s.push_clip_path(path, &rule(r));
|
||
pushes += 1;
|
||
}
|
||
Some(StrokeAlign::Outside) => {
|
||
// Clip to everything outside the path: a frame around all the stroke reaches
|
||
// (miter spikes included) plus the path, even-odd.
|
||
let mut outside = w.reach(st, bounds).inflate(1.0, 1.0).to_path(0.1);
|
||
outside.extend(bp.iter());
|
||
if let Some(p) = to_path(&outside) {
|
||
s.push_clip_path(&p, &krilla::paint::FillRule::EvenOdd);
|
||
pushes += 1;
|
||
}
|
||
}
|
||
_ => {}
|
||
}
|
||
match &w.shape {
|
||
WrittenShape::Stroke { width } => {
|
||
let dash = st.dash.as_ref().filter(|d| d.is_dashed()).map(|d| {
|
||
let mut pat: Vec<f32> = d.pattern.iter().map(|v| *v as f32).collect();
|
||
if pat.len() % 2 == 1 {
|
||
pat.extend(pat.clone());
|
||
}
|
||
StrokeDash { array: pat, offset: d.offset as f32 }
|
||
});
|
||
s.set_fill(None);
|
||
s.set_stroke(Some(Stroke {
|
||
paint,
|
||
width: *width as f32,
|
||
miter_limit: st.miter_limit.max(1.0) as f32,
|
||
line_cap: match st.cap {
|
||
LineCap::Butt => krilla::paint::LineCap::Butt,
|
||
LineCap::Round => krilla::paint::LineCap::Round,
|
||
LineCap::Square => krilla::paint::LineCap::Square,
|
||
},
|
||
line_join: match st.join {
|
||
LineJoin::Miter => krilla::paint::LineJoin::Miter,
|
||
LineJoin::Round => krilla::paint::LineJoin::Round,
|
||
LineJoin::Bevel => krilla::paint::LineJoin::Bevel,
|
||
},
|
||
opacity: norm(st.opacity),
|
||
dash,
|
||
}));
|
||
s.draw_path(path);
|
||
s.set_stroke(None);
|
||
}
|
||
WrittenShape::Fill(outlines) if st.path_gradient().is_some() => {
|
||
// A gradient along or across the stroke: slices clipped to its outlines, under
|
||
// the stroke's opacity as a group.
|
||
if let Some(ws) = stroke::written_slices(bp, r, st, outlines)
|
||
&& let Some(clip) = to_path(&ws.clip)
|
||
{
|
||
self.warn("gradients along or across strokes are exported as slices of linear gradients");
|
||
if st.opacity < 1.0 {
|
||
s.push_opacity(norm(st.opacity));
|
||
pushes += 1;
|
||
}
|
||
s.push_clip_path(&clip, &krilla::paint::FillRule::NonZero);
|
||
s.set_stroke(None);
|
||
for (shape, paint) in &ws.slices {
|
||
let b = shape.bounding_box();
|
||
if let (Some(paint), Some(p)) = (self.paint(paint, b), to_path(shape)) {
|
||
s.set_fill(Some(Fill { paint, opacity: NormalizedF32::ONE, rule: krilla::paint::FillRule::NonZero }));
|
||
s.draw_path(&p);
|
||
}
|
||
}
|
||
s.set_fill(None);
|
||
s.pop();
|
||
}
|
||
}
|
||
WrittenShape::Fill(outlines) => {
|
||
// The line and its arrowheads overlap: they take the opacity once, as a group.
|
||
let grouped = outlines.len() > 1 && st.opacity < 1.0;
|
||
if grouped {
|
||
s.push_opacity(norm(st.opacity));
|
||
pushes += 1;
|
||
}
|
||
let opacity = if grouped { NormalizedF32::ONE } else { norm(st.opacity) };
|
||
s.set_stroke(None);
|
||
s.set_fill(Some(Fill { paint, opacity, rule: krilla::paint::FillRule::NonZero }));
|
||
for p in outlines.iter().filter_map(to_path) {
|
||
s.draw_path(&p);
|
||
}
|
||
s.set_fill(None);
|
||
}
|
||
}
|
||
for _ in 0..pushes {
|
||
s.pop();
|
||
}
|
||
}
|
||
|
||
/// Paint stroke `st` of the shape `bp` with its brush art (the stroke's opacity and blend mode
|
||
/// over all of it). False when it has no known brush.
|
||
fn brush_art(&mut self, s: &mut Surface, bp: &BezPath, st: &StrokeLayer, page: Rect) -> bool {
|
||
let doc = self.doc;
|
||
let brushes = self.brushes.get_or_insert_with(|| vectorcraft_brush::library(doc));
|
||
let Some(b) = st.brush.as_deref().and_then(|name| brushes.iter().find(|b| b.name == name)) else { return false };
|
||
let art = vectorcraft_brush::stroke_pieces(b, bp, st);
|
||
let mut pushes = 0;
|
||
if st.blend != BlendMode::Normal {
|
||
s.push_blend_mode(blend(st.blend));
|
||
pushes += 1;
|
||
}
|
||
if st.opacity < 1.0 {
|
||
s.push_opacity(norm(st.opacity));
|
||
pushes += 1;
|
||
}
|
||
for piece in &art {
|
||
self.node(s, piece, page, false);
|
||
}
|
||
for _ in 0..pushes {
|
||
s.pop();
|
||
}
|
||
true
|
||
}
|
||
|
||
fn text(&mut self, s: &mut Surface, n: &Node, t: &TextObject, page: Rect) {
|
||
let layout = vectorcraft_text::layout(vectorcraft_text::FontDb::global(), t);
|
||
let tb = t.xf.transform_rect_bbox(layout.bounds);
|
||
// The object's own fills and strokes paint the whole outline: those below the Characters
|
||
// row under the characters, the others over them.
|
||
let (below, above) = n.appearance.split_contents();
|
||
let all = (!n.appearance.items.is_empty()).then(|| {
|
||
let mut all = layout.to_bezpath();
|
||
all.apply_affine(t.xf);
|
||
to_path(&all).map(|p| (all, p))
|
||
});
|
||
let all = all.flatten();
|
||
if let Some((bp, path)) = &all {
|
||
self.text_items(s, below, bp, path, page, tb);
|
||
}
|
||
s.push_transform(&xf(t.xf));
|
||
for (i, run) in t.runs.iter().enumerate() {
|
||
let mut bp = BezPath::new();
|
||
for g in layout.glyphs.iter().filter(|g| g.run == i) {
|
||
bp.extend(g.outline.iter());
|
||
}
|
||
let Some(path) = to_path(&bp) else { continue };
|
||
let opaque = (1.0, BlendMode::Normal);
|
||
if !self.area(s, &path, krilla::paint::FillRule::NonZero, &run.style.fill, opaque, layout.bounds, bp.bounding_box())
|
||
&& let Some(paint) = self.paint(&run.style.fill, layout.bounds)
|
||
{
|
||
s.set_stroke(None);
|
||
s.set_fill(Some(Fill { paint, opacity: NormalizedF32::ONE, rule: krilla::paint::FillRule::NonZero }));
|
||
s.draw_path(&path);
|
||
}
|
||
if run.style.has_stroke() {
|
||
// Character strokes are drawn in text space, with their cap, join and dashes.
|
||
self.stroke(s, &bp, &path, FillRule::NonZero, &run.style.stroke_layer(), page, layout.bounds);
|
||
}
|
||
}
|
||
s.set_fill(None);
|
||
s.set_stroke(None);
|
||
s.pop();
|
||
if let Some((bp, path)) = &all {
|
||
self.text_items(s, above, bp, path, page, tb);
|
||
}
|
||
}
|
||
|
||
/// Some of a type object's own fills and strokes (`items`) on its glyph outlines `bp` (`path`;
|
||
/// `tb`: their bounds). Strokes take every stroke option, as on paths.
|
||
#[allow(clippy::too_many_arguments)]
|
||
fn text_items(&mut self, s: &mut Surface, items: &[AppearanceItem], bp: &BezPath, path: &Path, page: Rect, tb: Rect) {
|
||
for item in items {
|
||
match item {
|
||
AppearanceItem::Fill(fl) if fl.visible => {
|
||
if !self.area(s, path, krilla::paint::FillRule::NonZero, &fl.paint, (fl.opacity, fl.blend), tb, bp.bounding_box())
|
||
&& let Some(paint) = self.paint(&fl.paint, tb)
|
||
{
|
||
s.set_stroke(None);
|
||
s.set_fill(Some(Fill { paint, opacity: norm(fl.opacity), rule: krilla::paint::FillRule::NonZero }));
|
||
s.draw_path(path);
|
||
}
|
||
}
|
||
AppearanceItem::Stroke(st) if st.visible && st.width > 0.0 => self.stroke(s, bp, path, FillRule::NonZero, st, page, tb),
|
||
_ => {}
|
||
}
|
||
}
|
||
s.set_fill(None);
|
||
s.set_stroke(None);
|
||
}
|
||
|
||
/// Image `key` placed `size` points wide and high, resampled and compressed as the Compression
|
||
/// settings say ([`crate::images::recode`]); cached by key (and size when images are
|
||
/// resampled).
|
||
fn load_image(&mut self, key: &str, size: (f64, f64)) -> Option<Image> {
|
||
let c = self.compression;
|
||
let sized = [c.color.downsample, c.gray.downsample, c.mono.downsample].iter().any(|d| *d != crate::Downsample::None);
|
||
let cache = if sized { format!("{key}\u{0}{:.3}x{:.3}", size.0, size.1) } else { key.to_string() };
|
||
if let Some(i) = self.images.get(&cache) {
|
||
return i.clone();
|
||
}
|
||
let interpolate = self.interpolate;
|
||
let doc = self.doc;
|
||
let img = doc.images.get(key).and_then(|blob| {
|
||
let r = crate::images::recode(&blob.bytes, size, c, interpolate);
|
||
if let Some(w) = r.warning {
|
||
self.warn(w);
|
||
}
|
||
r.image.or_else(|| embed(blob, interpolate))
|
||
});
|
||
if img.is_none() {
|
||
self.warn(format!("image '{key}' could not be decoded and was skipped"));
|
||
}
|
||
self.images.insert(cache, img.clone());
|
||
img
|
||
}
|
||
|
||
fn image(&mut self, s: &mut Surface, im: &vectorcraft_doc::ImageObject) {
|
||
// The size it is placed at: its pixel grid's sides through its transform.
|
||
let [a, b, c, d, ..] = im.xf.as_coeffs();
|
||
let size = (im.width as f64 * a.hypot(b), im.height as f64 * c.hypot(d));
|
||
let Some(img) = self.load_image(&im.key, size) else { return };
|
||
let Some(size) = Size::from_wh(im.width.max(1) as f32, im.height.max(1) as f32) else { return };
|
||
s.push_transform(&xf(im.xf));
|
||
s.draw_image(img, size);
|
||
s.pop();
|
||
}
|
||
}
|
||
|
||
/// Image `blob` as it is: PNG, JPEG, GIF and WebP through the PDF writer (JPEG data unchanged),
|
||
/// other formats decoded.
|
||
fn embed(blob: &vectorcraft_doc::ImageBlob, interpolate: bool) -> Option<Image> {
|
||
let bytes = blob.bytes.as_ref().clone();
|
||
let direct = match blob.mime.as_str() {
|
||
"image/png" => Image::from_png(bytes.clone().into(), interpolate).ok(),
|
||
"image/jpeg" | "image/jpg" => Image::from_jpeg(bytes.clone().into(), interpolate).ok(),
|
||
"image/gif" => Image::from_gif(bytes.clone().into(), interpolate).ok(),
|
||
"image/webp" => Image::from_webp(bytes.clone().into(), interpolate).ok(),
|
||
_ => None,
|
||
};
|
||
direct.or_else(|| {
|
||
let rgba = image::load_from_memory(&bytes).ok()?.to_rgba8();
|
||
let (w, h) = rgba.dimensions();
|
||
Some(Image::from_rgba8(rgba.into_raw(), w, h))
|
||
})
|
||
}
|