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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| //! Generates a [cpal](https://learn.microsoft.com/en-us/typography/opentype/spec/cpal) table. | ||
| use crate::{ | ||
| error::Error, | ||
| orchestration::{AnyWorkId, BeWork, Context, WorkId}, | ||
| }; | ||
| use fontdrasil::orchestration::{Access, Work}; | ||
| use fontir::orchestration::WorkId as FeWorkId; | ||
| use log::debug; | ||
| use write_fonts::{tables::cpal::ColorRecord, tables::cpal::Cpal, NullableOffsetMarker}; | ||
|
|
||
| #[derive(Debug)] | ||
| struct CpalWork {} | ||
|
|
||
| pub fn create_cpal_work() -> Box<BeWork> { | ||
| Box::new(CpalWork {}) | ||
| } | ||
|
|
||
| impl Work<Context, AnyWorkId, Error> for CpalWork { | ||
| fn id(&self) -> AnyWorkId { | ||
| WorkId::Cpal.into() | ||
| } | ||
|
|
||
| fn read_access(&self) -> Access<AnyWorkId> { | ||
| Access::Variant(AnyWorkId::Fe(FeWorkId::ColorPalettes)) | ||
| } | ||
|
|
||
| /// Generate [cpal](https://learn.microsoft.com/en-us/typography/opentype/spec/cpal) | ||
| fn exec(&self, context: &Context) -> Result<(), Error> { | ||
| let colors = context.ir.colors.try_get(); | ||
| // Guard clause: no colors | ||
| if !colors | ||
| .as_ref() | ||
| .map(|c| c.palettes.iter().any(|p| !p.is_empty())) | ||
| .unwrap_or_default() | ||
| { | ||
| debug!("Skip cpal; no colors"); | ||
| return Ok(()); | ||
| } | ||
| let colors = colors.unwrap(); | ||
| let sz0 = colors.palettes[0].len(); | ||
| if colors.palettes.iter().any(|p| p.len() != sz0) { | ||
| return Err(Error::InconsistentPaletteLength( | ||
| colors.palettes.iter().map(Vec::len).collect(), | ||
| )); | ||
| } | ||
|
|
||
| let color_records = colors | ||
| .palettes | ||
| .iter() | ||
| .flat_map(|p| p.iter()) | ||
| .map(|c| ColorRecord { | ||
| red: c.r, | ||
| green: c.g, | ||
| blue: c.b, | ||
| alpha: c.a, | ||
| }) | ||
| .collect::<Vec<_>>(); | ||
|
|
||
| if color_records.len() > u16::MAX.into() { | ||
| return Err(Error::OutOfBounds { | ||
| what: "Too many CPAL colorRecords".to_string(), | ||
| value: format!("{}", color_records.len()), | ||
| }); | ||
| } | ||
|
|
||
| let entries_per_palette = colors.palettes[0].len(); | ||
| debug!( | ||
| "CPAL has {} color records in {} palette(s) of {}", | ||
| color_records.len(), | ||
| colors.palettes.len(), | ||
| entries_per_palette | ||
| ); | ||
| context.cpal.set(Cpal { | ||
| num_palette_entries: entries_per_palette as u16, | ||
| num_palettes: colors.palettes.len() as u16, | ||
| num_color_records: color_records.len() as u16, | ||
| color_records_array: NullableOffsetMarker::new(Some(color_records)), | ||
| color_record_indices: (0..colors.palettes.len()) | ||
| .map(|i| (i * entries_per_palette) as u16) | ||
| .collect(), | ||
| ..Default::default() | ||
| }); | ||
|
|
||
| Ok(()) | ||
| } | ||
| } |
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