cmx 0.1.0

Rust Spectral Color Management Library
Documentation 
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pub fn read_display_p3_profile() -> Result<cmx::profile::Profile, Box<dyn std::error::Error>> {
    use std::fs;
    use std::path::Path;

    let profile_path = Path::new("tests/profiles/Display P3.icc");
    let profile_bytes = fs::read(profile_path).expect("Failed to read Display P3 profile");
    let raw_profile = cmx::profile::RawProfile::from_bytes(&profile_bytes)?;

    Ok(raw_profile.into_class_profile())
}

#[cfg(test)]
mod make_display_p3 {

    use chrono::{DateTime, TimeZone};
    use cmx::profile::DisplayProfile;

    #[test]
    #[rustfmt::skip]
    // This test constructs the Display P3 profile as provided by Apple using the cmx builder API,
    // and compares the profile ID to ensure it matches the original profile.
    fn apple_display_p3() -> Result<(), Box<dyn std::error::Error>> {
        let date = DateTime::parse_from_rfc3339("2017-07-07T13:22:32Z")
            .expect("Failed to parse date");
        use cmx::tag::tags::*;
        let display_p3_cmx = DisplayProfile::new()
            .with_version(4, 0)?
            .with_creation_date(date)
            .with_cmm(cmx::signatures::Cmm::Apple)?
            .with_profile_id()
            .with_primary_platform(cmx::signatures::Platform::Apple)
            .with_manufacturer("APPL")
            .with_creator("appl")
            .with_tag(ProfileDescriptionTag)
                .as_text_description(|text| {
                    text.set_ascii("Display P3");
                })
            .with_tag(CopyrightTag)
                .as_text(|text| {
                    text.set_text("Copyright Apple Inc., 2017");
                })
            .with_tag(MediaWhitePointTag)
                .as_xyz_array(|xyz| {
                    xyz.set([0.950455, 1.00000, 1.08905]);
                })
            .with_tag(RedMatrixColumnTag)
                .as_xyz_array(|xyz| {
                    xyz.set([0.515121, 0.241196, -0.001053]);
                })
            .with_tag(GreenMatrixColumnTag)
                .as_xyz_array(|xyz| {
                    xyz.set([0.291977, 0.692245, 0.041885]);
                })
            .with_tag(BlueMatrixColumnTag)
                .as_xyz_array(|xyz| {
                    xyz.set([0.157104, 0.066574, 0.784073]);
                })
            .with_tag(RedTRCTag)
                .as_parametric_curve(|para| {
                    para.set_parameters([2.39999, 0.94786, 0.05214, 0.07739, 0.04045]);
                })
            .with_tag(ChromaticAdaptationTag)
                .as_sf15_fixed_16_array(|array| {
                    array.set([
                         1.047882, 0.022919, -0.050201,
                         0.029587, 0.990479, -0.017059,
                        -0.009232, 0.015076,  0.751678
                    ]);
                })
            .with_tag(BlueTRCTag)
                .as_parametric_curve(|para| {
                    para.set_parameters([2.39999, 0.94786, 0.05214, 0.07739, 0.04045]);
                })
            .with_tag(GreenTRCTag)
                .as_parametric_curve(|para| {
                    para.set_parameters([2.39999, 0.94786, 0.05214, 0.07739, 0.04045]);
                })
            ;

        let display_p3_original = cmx::profile::RawProfile::from_bytes(
            include_bytes!("../tests/profiles/Display P3.icc")
        )?;

        // Convert to bytes and back to ensure consistency, but also to calculate the profile ID,
        // which is done at the end of the to_bytes() method.
        let display_p3_cmx_bytes = display_p3_cmx.to_bytes()?;
        let display_p3_cmx_2 = cmx::profile::Profile::from_bytes(&display_p3_cmx_bytes)?;

        assert!(display_p3_original.profile_id() == display_p3_cmx_2.profile_id());
        Ok(())
    }

    #[test]
    fn display_p3_doc_example() -> Result<(), Box<dyn std::error::Error>> {
        use cmx::tag::tags::*;
        let display_p3_example = DisplayProfile::new()
            // set creation date, if omitted, the current date and time is used
            .with_creation_date(chrono::Utc.with_ymd_and_hms(2025, 8, 28, 0, 0, 0).unwrap())
            .with_tag(ProfileDescriptionTag)
                .as_text_description(|text| {
                    text.set_ascii("Display P3");
                })
            .with_tag(CopyrightTag)
                .as_text(|text| {
                    text.set_text("CC0");
                })
            .with_tag(MediaWhitePointTag)
                .as_xyz_array(|xyz| {
                    xyz.set([0.950455, 1.00000, 1.08905]);
                })
            .with_tag(RedMatrixColumnTag)
                .as_xyz_array(|xyz| {
                    xyz.set([0.515121, 0.241196, -0.001053]);
                })
            .with_tag(GreenMatrixColumnTag)
                .as_xyz_array(|xyz| {
                    xyz.set([0.291977, 0.692245, 0.041885]);
                })
            .with_tag(BlueMatrixColumnTag)
                .as_xyz_array(|xyz| {
                    xyz.set([0.157104, 0.066574, 0.784073]);
                })
            .with_tag(RedTRCTag)
                .as_parametric_curve(|para| {
                    para.set_parameters([2.39999, 0.94786, 0.05214, 0.07739, 0.04045]);
                })
            .with_tag(BlueTRCTag)
                .as_parametric_curve(|para| {
                    para.set_parameters([2.39999, 0.94786, 0.05214, 0.07739, 0.04045]);
                })
            .with_tag(GreenTRCTag)
                .as_parametric_curve(|para| {
                    para.set_parameters([2.39999, 0.94786, 0.05214, 0.07739, 0.04045]);
                })
            .with_tag(ChromaticAdaptationTag)
                .as_sf15_fixed_16_array(|array| {
                    array.set([
                         1.047882, 0.022919, -0.050201,
                         0.029587, 0.990479, -0.017059,
                        -0.009232, 0.015076,  0.751678
                    ]);
                })
            .with_profile_id() // calcualate and add profile ID to the profile
            ;

        let bytes = display_p3_example.to_bytes()?;
        let display_p3_read_back = cmx::profile::Profile::from_bytes(&bytes)?;
        assert_eq!(
            display_p3_read_back.profile_id_as_hex_string(),
            "617028e1 e1014e15 91f178a9 fb8efc92"
        );
        assert_eq!(display_p3_read_back.profile_size(), 524);
        Ok(())
    }
}