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https://github.com/typst/typst
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36 lines
1.1 KiB
Rust
36 lines
1.1 KiB
Rust
use crate::PdfContext;
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/// A PDF external graphics state.
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#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
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pub struct ExtGState {
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// In the range 0-255, needs to be divided before being written into the graphics state!
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pub stroke_opacity: u8,
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// In the range 0-255, needs to be divided before being written into the graphics state!
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pub fill_opacity: u8,
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}
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impl Default for ExtGState {
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fn default() -> Self {
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Self { stroke_opacity: 255, fill_opacity: 255 }
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}
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}
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impl ExtGState {
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pub fn uses_opacities(&self) -> bool {
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self.stroke_opacity != 255 || self.fill_opacity != 255
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}
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}
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/// Embed all used external graphics states into the PDF.
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#[tracing::instrument(skip_all)]
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pub(crate) fn write_external_graphics_states(ctx: &mut PdfContext) {
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for external_gs in ctx.extg_map.items() {
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let id = ctx.alloc.bump();
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ctx.ext_gs_refs.push(id);
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ctx.pdf
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.ext_graphics(id)
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.non_stroking_alpha(external_gs.fill_opacity as f32 / 255.0)
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.stroking_alpha(external_gs.stroke_opacity as f32 / 255.0);
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}
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}
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