Crate normalize_css_z

Normalize a CSS z-index to an f32 floating-point number between 0.0 and 1.0. (not exactly…)

Theoretically, this is not entirely feasible because we can generate only 2^23 (subnormal) * 127 (normal) = 1,065,353,216 distinct floating-point numbers in this range.

And, the best part is that we only get a handful of precise numbers. Specifically, this crate can generate 25,165,825 unique floating-point numbers between 0.0 and 1.0, which should be more than sufficient for most use cases (hopefully).

Supported ranges of z-indexes (default)

LOWER	MIDDLE	UPPER
-2_147_483_647..=-2_139_095_039	-4_194_303..=4_194_304	2_139_095_040..=2_147_483_647

Example

let z_ = 2_147_483_647;
if let Some(z) = normalize(z_) {
    // Do something with `z`.
} else {
    // Handle unsupported z-index.
}

Later, I aim to expand this to allow for customizable ranges, but for now, this should be adequate.

Constants

• MANTISSA
• MAX_CSS_Z
• RANGE_LOWER_L
• RANGE_LOWER_U
• RANGE_MIDDLE_L
• RANGE_MIDDLE_U
• RANGE_UPPER_L
• RANGE_UPPER_U

Functions

• normalize
  Normalizes a CSS z-index to an f32 floating-point number between 0.0 and 1.0.