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Add proper support for CMYK and luma

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This commit is contained in:
Laurenz Stampfl 2024-12-15 23:36:09 +01:00
parent 5780432039
commit aa57554176
2 changed files with 37 additions and 9 deletions
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15
crates/typst-pdf/src/krilla.rs
View File

@ -296,7 +296,7 @@ pub fn pdf(
}
KrillaError::ValidationError(ve) => {
// We can only produce 1 error, so just take the first one.
let prefix = "validated export failed:";
let prefix = format!("validated export for {} failed:", options.validator.as_str());
match &ve[0] {
ValidationError::TooLongString => {
bail!(Span::detached(), "{prefix} a PDF string longer than 32767 characters";
@ -323,6 +323,7 @@ pub fn pdf(
bail!(Span::detached(), "{prefix} the PDF has too many indirect objects";
hint: "reduce the size of your document");
}
// Can only occur if we have 27+ nested clip paths
ValidationError::TooHighQNestingLevel => {
bail!(Span::detached(), "{prefix} the PDF has too high q nesting";
hint: "reduce the number of nested containers");
@ -337,11 +338,11 @@ pub fn pdf(
}
ValidationError::ContainsNotDefGlyph => {
bail!(Span::detached(), "{prefix} the PDF contains the .notdef glyph";
hint: "ensure all text can be displayed using a font");
hint: "ensure all text can be displayed using an available font");
}
ValidationError::InvalidCodepointMapping(_, _) => {
bail!(Span::detached(), "{prefix} the PDF contains the disallowed codepoints";
hint: "make sure you don't use the Unicode characters 0x0, 0xFEFF or 0xFFFE");
hint: "make sure to not use the Unicode characters 0x0, 0xFEFF or 0xFFFE");
}
ValidationError::UnicodePrivateArea(_, _) => {
bail!(Span::detached(), "{prefix} the PDF contains characters from the Unicode private area";
@ -349,11 +350,15 @@ pub fn pdf(
}
ValidationError::Transparency => {
bail!(Span::detached(), "{prefix} document contains transparency";
hint: "remove any transparency in your document and your SVGs";
hint: "remove any transparency from your document (e.g. fills with opacity)";
hint: "you might have to convert certain SVGs into a bitmap image if they contain transparency";
hint: "export using a different standard that supports transparency"
);
}
// The below errors cannot occur yet, only once Typst supports PDF/A and PDF/UA.
// The below errors cannot occur yet, only once Typst supports full PDF/A
// and PDF/UA.
// But let's still add a message just to be on the safe side.
ValidationError::MissingAnnotationAltText => {
bail!(Span::detached(), "{prefix} missing annotation alt text";
hint: "please report this as a bug");

31
crates/typst-pdf/src/paint.rs
View File

@ -57,7 +57,7 @@ fn dash(dash: &DashPattern<Abs, Abs>) -> krilla::path::StrokeDash {
}
}
fn convert_color(color: &Color) -> (krilla::color::rgb::Color, u8) {
fn convert_to_rgb_color(color: &Color) -> (krilla::color::rgb::Color, u8) {
let components = color.to_space(ColorSpace::Srgb).to_vec4_u8();
(
krilla::color::rgb::Color::new(components[0], components[1], components[2])
@ -75,8 +75,31 @@ fn paint(
) -> SourceResult<(krilla::paint::Paint, u8)> {
match paint {
Paint::Solid(c) => {
let (c, alpha) = convert_color(c);
Ok((c.into(), alpha))
let (p, alpha) = match c.space() {
ColorSpace::D65Gray => {
let components = c.to_vec4_u8();
(
krilla::color::luma::Color::new(components[0])
.into(),
components[3],
)
}
ColorSpace::Cmyk => {
let components = c.to_vec4_u8();
(
krilla::color::cmyk::Color::new(components[0], components[1], components[2], components[3])
.into(),
// Typst doesn't support alpha on CMYK colors.
255,
)
}
_ => {
let (c, a) = convert_to_rgb_color(c);
(c.into(), a)
}
};
Ok((p, alpha))
}
Paint::Gradient(g) => Ok(convert_gradient(g, on_text, transforms)),
Paint::Pattern(p) => convert_pattern(gc, p, on_text, surface, transforms),
@ -154,7 +177,7 @@ fn convert_gradient(
let mut stops: Vec<krilla::paint::Stop<krilla::color::rgb::Color>> = vec![];
let mut add_single = |color: &Color, offset: Ratio| {
let (color, opacity) = convert_color(color);
let (color, opacity) = convert_to_rgb_color(color);
let opacity = NormalizedF32::new((opacity as f32) / 255.0).unwrap();
let offset = NormalizedF32::new(offset.get() as f32).unwrap();
let stop = krilla::paint::Stop { offset, color, opacity };