j2k-codec-math 0.7.1

no_std codec constants, generated fragments, and allocation-free helper algorithms for j2k
Documentation 
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use j2k_codec_math::dwt;

#[test]
fn generated_source_comparison_ignores_only_line_endings() {
    assert!(generated_source_matches(
        "alpha\r\nbeta\r\n",
        "alpha\nbeta\n"
    ));
    assert!(!generated_source_matches(
        "alpha\r\ngamma\r\n",
        "alpha\nbeta\n"
    ));
}

#[test]
fn metal_dwt97_fragment_matches_rust_constants() {
    let expected = [
        "// Generated from crates/j2k-codec-math/src/dwt.rs.".to_string(),
        format!(
            "constant float CODEC_MATH_DWT97_ALPHA = {}f;",
            compact_f32(dwt::DWT97_ALPHA_F32)
        ),
        format!(
            "constant float CODEC_MATH_DWT97_BETA = {}f;",
            compact_f32(dwt::DWT97_BETA_F32)
        ),
        format!(
            "constant float CODEC_MATH_DWT97_GAMMA = {}f;",
            compact_f32(dwt::DWT97_GAMMA_F32)
        ),
        format!(
            "constant float CODEC_MATH_DWT97_DELTA = {}f;",
            compact_f32(dwt::DWT97_DELTA_F32)
        ),
        format!(
            "constant float CODEC_MATH_DWT97_KAPPA = {}f;",
            compact_f32(dwt::DWT97_KAPPA_F32)
        ),
        "constant float CODEC_MATH_DWT97_INV_KAPPA = 1.0f / CODEC_MATH_DWT97_KAPPA;".to_string(),
        format!(
            "constant float CODEC_MATH_IDWT97_NEG_ALPHA = {}f;",
            compact_f32(dwt::IDWT97_NEG_ALPHA_F32)
        ),
        format!(
            "constant float CODEC_MATH_IDWT97_NEG_BETA = {}f;",
            compact_f32(dwt::IDWT97_NEG_BETA_F32)
        ),
        format!(
            "constant float CODEC_MATH_IDWT97_NEG_GAMMA = {}f;",
            compact_f32(dwt::IDWT97_NEG_GAMMA_F32)
        ),
        format!(
            "constant float CODEC_MATH_IDWT97_NEG_DELTA = {}f;",
            compact_f32(dwt::IDWT97_NEG_DELTA_F32)
        ),
    ]
    .join("\n")
        + "\n";

    assert!(
        generated_source_matches(
            include_str!("../generated/dwt97_constants.metal"),
            &expected
        ),
        "generated Metal constants differ from the Rust source constants"
    );
}

#[test]
fn rust_dwt97_fragment_matches_rust_constants() {
    let expected = [
        "// Generated from crates/j2k-codec-math/src/dwt.rs.".to_string(),
        format!(
            "pub const CODEC_MATH_DWT97_ALPHA: f32 = {};",
            compact_f32(dwt::DWT97_ALPHA_F32)
        ),
        format!(
            "pub const CODEC_MATH_DWT97_BETA: f32 = {};",
            compact_f32(dwt::DWT97_BETA_F32)
        ),
        format!(
            "pub const CODEC_MATH_DWT97_GAMMA: f32 = {};",
            compact_f32(dwt::DWT97_GAMMA_F32)
        ),
        format!(
            "pub const CODEC_MATH_DWT97_DELTA: f32 = {};",
            compact_f32(dwt::DWT97_DELTA_F32)
        ),
        format!(
            "pub const CODEC_MATH_DWT97_KAPPA: f32 = {};",
            compact_f32(dwt::DWT97_KAPPA_F32)
        ),
        "pub const CODEC_MATH_DWT97_INV_KAPPA: f32 = 1.0 / CODEC_MATH_DWT97_KAPPA;".to_string(),
        format!(
            "pub const CODEC_MATH_IDWT97_NEG_ALPHA: f32 = {};",
            compact_f32(dwt::IDWT97_NEG_ALPHA_F32)
        ),
        format!(
            "pub const CODEC_MATH_IDWT97_NEG_BETA: f32 = {};",
            compact_f32(dwt::IDWT97_NEG_BETA_F32)
        ),
        format!(
            "pub const CODEC_MATH_IDWT97_NEG_GAMMA: f32 = {};",
            compact_f32(dwt::IDWT97_NEG_GAMMA_F32)
        ),
        format!(
            "pub const CODEC_MATH_IDWT97_NEG_DELTA: f32 = {};",
            compact_f32(dwt::IDWT97_NEG_DELTA_F32)
        ),
    ]
    .join("\n")
        + "\n";

    assert!(
        generated_source_matches(include_str!("../generated/dwt97_constants.rs"), &expected),
        "generated Rust constants differ from the source constants"
    );
}

fn compact_f32(value: f32) -> String {
    format!("{value:?}")
}

fn generated_source_matches(actual: &str, expected: &str) -> bool {
    actual.replace("\r\n", "\n") == expected.replace("\r\n", "\n")
}