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use std::ops::Range;
use std::sync::Arc;
use bytemuck::TransparentWrapper;
use krilla::surface::{Location, Surface};
use krilla::text::GlyphId;
use typst_library::diag::{bail, SourceResult};
use typst_library::layout::Size;
use typst_library::text::{Font, Glyph, TextItem};
use typst_library::visualize::FillRule;
use typst_syntax::Span;
use crate::convert::{FrameContext, GlobalContext};
use crate::util::{display_font, AbsExt, TransformExt};
use crate::{paint, tags};
#[typst_macros::time(name = "handle text")]
pub(crate) fn handle_text(
fc: &mut FrameContext,
t: &TextItem,
surface: &mut Surface,
gc: &mut GlobalContext,
) -> SourceResult<()> {
*gc.languages.entry(t.lang).or_insert(0) += t.glyphs.len();
let mut handle = tags::start_marked(gc, surface);
let surface = handle.surface();
let font = convert_font(gc, t.font.clone())?;
let fill = paint::convert_fill(
gc,
&t.fill,
FillRule::NonZero,
true,
surface,
fc.state(),
Size::zero(),
)?;
let stroke =
if let Some(stroke) = t.stroke.as_ref().map(|s| {
paint::convert_stroke(gc, s, true, surface, fc.state(), Size::zero())
}) {
Some(stroke?)
} else {
None
};
let text = t.text.as_str();
let size = t.size;
let glyphs: &[PdfGlyph] = TransparentWrapper::wrap_slice(t.glyphs.as_slice());
surface.push_transform(&fc.state().transform().to_krilla());
surface.set_fill(Some(fill));
surface.set_stroke(stroke);
surface.draw_glyphs(
krilla::geom::Point::from_xy(0.0, 0.0),
glyphs,
font.clone(),
text,
size.to_f32(),
false,
);
surface.pop();
Ok(())
}
fn convert_font(
gc: &mut GlobalContext,
typst_font: Font,
) -> SourceResult<krilla::text::Font> {
if let Some(font) = gc.fonts_forward.get(&typst_font) {
Ok(font.clone())
} else {
let font = build_font(typst_font.clone())?;
gc.fonts_forward.insert(typst_font.clone(), font.clone());
gc.fonts_backward.insert(font.clone(), typst_font.clone());
Ok(font)
}
}
#[comemo::memoize]
fn build_font(typst_font: Font) -> SourceResult<krilla::text::Font> {
let font_data: Arc<dyn AsRef<[u8]> + Send + Sync> =
Arc::new(typst_font.data().clone());
match krilla::text::Font::new(font_data.into(), typst_font.index()) {
None => {
let font_str = display_font(&typst_font);
bail!(Span::detached(), "failed to process font {font_str}");
}
Some(f) => Ok(f),
}
}
#[derive(TransparentWrapper, Debug)]
#[repr(transparent)]
struct PdfGlyph(Glyph);
impl krilla::text::Glyph for PdfGlyph {
#[inline(always)]
fn glyph_id(&self) -> GlyphId {
GlyphId::new(self.0.id as u32)
}
#[inline(always)]
fn text_range(&self) -> Range<usize> {
self.0.range.start as usize..self.0.range.end as usize
}
#[inline(always)]
fn x_advance(&self, size: f32) -> f32 {
// Don't use `Em::at`, because it contains an expensive check whether the result is finite.
self.0.x_advance.get() as f32 * size
}
#[inline(always)]
fn x_offset(&self, size: f32) -> f32 {
// Don't use `Em::at`, because it contains an expensive check whether the result is finite.
self.0.x_offset.get() as f32 * size
}
#[inline(always)]
fn y_offset(&self, size: f32) -> f32 {
// Don't use `Em::at`, because it contains an expensive check whether the result is finite.
self.0.y_offset.get() as f32 * size
}
#[inline(always)]
fn y_advance(&self, size: f32) -> f32 {
// Don't use `Em::at`, because it contains an expensive check whether the result is finite.
self.0.y_advance.get() as f32 * size
}
fn location(&self) -> Option<Location> {
Some(self.0.span.0.into_raw().get())
}
}
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