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|
use std::collections::HashMap;
use ecow::eco_format;
use pdf_writer::types::{ColorSpaceOperand, PaintType, TilingType};
use pdf_writer::{Filter, Name, Rect, Ref};
use typst::diag::SourceResult;
use typst::layout::{Abs, Ratio, Transform};
use typst::utils::Numeric;
use typst::visualize::{Pattern, RelativeTo};
use crate::color::PaintEncode;
use crate::content;
use crate::resources::{Remapper, ResourcesRefs};
use crate::{transform_to_array, PdfChunk, Resources, WithGlobalRefs};
/// Writes the actual patterns (tiling patterns) to the PDF.
/// This is performed once after writing all pages.
pub fn write_patterns(
context: &WithGlobalRefs,
) -> SourceResult<(PdfChunk, HashMap<PdfPattern, Ref>)> {
let mut chunk = PdfChunk::new();
let mut out = HashMap::new();
context.resources.traverse(&mut |resources| {
let Some(patterns) = &resources.patterns else {
return Ok(());
};
for pdf_pattern in patterns.remapper.items() {
let PdfPattern { transform, pattern, content, .. } = pdf_pattern;
if out.contains_key(pdf_pattern) {
continue;
}
let tiling = chunk.alloc();
out.insert(pdf_pattern.clone(), tiling);
let mut tiling_pattern = chunk.tiling_pattern(tiling, content);
tiling_pattern
.tiling_type(TilingType::ConstantSpacing)
.paint_type(PaintType::Colored)
.bbox(Rect::new(
0.0,
0.0,
pattern.size().x.to_pt() as _,
pattern.size().y.to_pt() as _,
))
.x_step((pattern.size().x + pattern.spacing().x).to_pt() as _)
.y_step((pattern.size().y + pattern.spacing().y).to_pt() as _);
// The actual resource dict will be written in a later step
tiling_pattern.pair(Name(b"Resources"), patterns.resources.reference);
tiling_pattern
.matrix(transform_to_array(
transform
.pre_concat(Transform::scale(Ratio::one(), -Ratio::one()))
.post_concat(Transform::translate(
Abs::zero(),
pattern.spacing().y,
)),
))
.filter(Filter::FlateDecode);
}
Ok(())
})?;
Ok((chunk, out))
}
/// A pattern and its transform.
#[derive(Clone, PartialEq, Eq, Hash, Debug)]
pub struct PdfPattern {
/// The transform to apply to the pattern.
pub transform: Transform,
/// The pattern to paint.
pub pattern: Pattern,
/// The rendered pattern.
pub content: Vec<u8>,
}
/// Registers a pattern with the PDF.
fn register_pattern(
ctx: &mut content::Builder,
pattern: &Pattern,
on_text: bool,
mut transforms: content::Transforms,
) -> SourceResult<usize> {
let patterns = ctx
.resources
.patterns
.get_or_insert_with(|| Box::new(PatternRemapper::new()));
// Edge cases for strokes.
if transforms.size.x.is_zero() {
transforms.size.x = Abs::pt(1.0);
}
if transforms.size.y.is_zero() {
transforms.size.y = Abs::pt(1.0);
}
let transform = match pattern.unwrap_relative(on_text) {
RelativeTo::Self_ => transforms.transform,
RelativeTo::Parent => transforms.container_transform,
};
// Render the body.
let content = content::build(
ctx.options,
&mut patterns.resources,
pattern.frame(),
None,
None,
)?;
let pdf_pattern = PdfPattern {
transform,
pattern: pattern.clone(),
content: content.content.wait().clone(),
};
Ok(patterns.remapper.insert(pdf_pattern))
}
impl PaintEncode for Pattern {
fn set_as_fill(
&self,
ctx: &mut content::Builder,
on_text: bool,
transforms: content::Transforms,
) -> SourceResult<()> {
ctx.reset_fill_color_space();
let index = register_pattern(ctx, self, on_text, transforms)?;
let id = eco_format!("P{index}");
let name = Name(id.as_bytes());
ctx.content.set_fill_color_space(ColorSpaceOperand::Pattern);
ctx.content.set_fill_pattern(None, name);
Ok(())
}
fn set_as_stroke(
&self,
ctx: &mut content::Builder,
on_text: bool,
transforms: content::Transforms,
) -> SourceResult<()> {
ctx.reset_stroke_color_space();
let index = register_pattern(ctx, self, on_text, transforms)?;
let id = eco_format!("P{index}");
let name = Name(id.as_bytes());
ctx.content.set_stroke_color_space(ColorSpaceOperand::Pattern);
ctx.content.set_stroke_pattern(None, name);
Ok(())
}
}
/// De-duplicate patterns and the resources they require to be drawn.
pub struct PatternRemapper<R> {
/// Pattern de-duplicator.
pub remapper: Remapper<PdfPattern>,
/// PDF resources that are used by these patterns.
pub resources: Resources<R>,
}
impl PatternRemapper<()> {
pub fn new() -> Self {
Self {
remapper: Remapper::new("P"),
resources: Resources::default(),
}
}
/// Allocate a reference to the resource dictionary of these patterns.
pub fn with_refs(self, refs: &ResourcesRefs) -> PatternRemapper<Ref> {
PatternRemapper {
remapper: self.remapper,
resources: self.resources.with_refs(refs),
}
}
}
|
