Module color 

CSS color conversion helpers for HTML drawables.

These functions turn Cotis color types into CSS color strings used by drawable_defaults (background-color, color, etc.).

Default vs feature-gated API

Without features, all helpers take Color.

With complex_color, fill/background helpers take ColorLayer. With complex_colored_text, text_color_css takes ColorLayer.

Gradients

When features are enabled, only ColorLayer::Solid produces a real CSS color. Other layer variants (linear, radial, layered) currently return "transparent". Full CSS gradient mapping is on the roadmap.

Functions

color_css

Formats a Cotis Color as a CSS rgba(r, g, b, a) string.

css_alpha

Normalizes alpha to the 0.0–1.0 range expected by CSS rgba().

custom_background_css

CSS background color for custom HTML host elements.

image_background_css

CSS background color behind an Image drawable.

rectangle_fill_css

CSS background-color (or fill) for a Rectangle.

text_color_css

CSS color for a Text drawable.