feat(window): add configurable opacity - #84
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Add a window.opacity config (0.0-1.0, default 1.0). When below 1.0 the window is created transparent and the terminal background is filled with that alpha while text and UI chrome stay opaque. Alpha handling is compositor/platform-dependent (best-effort).
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The alpha only reached the global buffer fill and the pane background, so every cell repainted itself opaque and the transparency was visible only in the pane padding at the window edges. Thread a BgAlpha (alpha + default background) down to resolve_bg_color and pack the alpha into cells still on the default background. Cells with an application-set background, the cursor, the selection, and search highlights stay opaque; glyph blending already forces full alpha.
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Summary
Adds a
window.opacityconfig option (float,0.0–1.0, default1.0). When set below1.0, the window is created transparent and the terminal background is rendered with that alpha, while text, glyphs, and UI chrome (tab bar, status bar, separators) stay fully opaque.Note: alpha handling in softbuffer is platform/compositor-dependent (X11 vs Wayland vs macOS/CoreGraphics), so this is best-effort and requires a compositor that supports transparency.
Changes
config: addopacity: f32toWindowConfigwith#[serde(default = "default_opacity")](default1.0); addopacity = 1.0toassets/config.toml.config(TUI): addF_OPACITYfield (FieldKind::Float, "Opacity", hint "0.0–1.0 window background opacity"); parse and clamp to0.0..=1.0inbuild_config.renderer: addcolor_u32_with_alpha(c, a)packing alpha into the high byte (0xAARRGGBB); threadopacitythroughRenderer::drawanddraw_pane, applying it to the frame background clear and per-pane background fills only.winit_handler: request.with_transparent(true)whenopacity < 1.0.doc/SPEC.mdconfig table + prose,README.md[window]block,CHANGELOG.md.How to test
cargo test— full suite passes (1225 tests).cargo clippy --locked -- -D warnings— clean.opacity = 0.8under[window]inconfig.tomland launch under a compositor that supports transparency; the terminal background is translucent while text stays readable.