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renderer: Allow the renderer to draw transparent cells (#7913)

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Fixes #5917

Allows the terminal to draw transparent cells even if they don't have
the same background color, on user demand, with the
`background-opacity-cells` feature

<img width="2560" height="1440" alt="transparent"
src="https://github.com/user-attachments/assets/8c076671-3603-41a1-957d-46ddaeffa1ff"
/>
This commit is contained in:
Mitchell Hashimoto
2025-07-11 07:01:54 -07:00
committed by GitHub
parent 4aa28988a6 991426e84e
commit 6c0adaed0f
2 changed files with 25 additions and 0 deletions
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16
src/config/Config.zig
View File

@ -814,6 +814,22 @@ palette: Palette = .{},
/// On macOS, changing this configuration requires restarting Ghostty completely.
@"background-opacity": f64 = 1.0,
/// Applies background opacity to cells with an explicit background color
/// set.
///
/// Normally, `background-opacity` is only applied to the window background.
/// If a cell has an explicit background color set, such as red, then that
/// background color will be fully opaque. An effect of this is that some
/// terminal applications that repaint the background color of the terminal
/// such as a Neovim and Tmux may not respect the `background-opacity`
/// (by design).
///
/// Setting this to `true` will apply the `background-opacity` to all cells
/// regardless of whether they have an explicit background color set or not.
///
/// Available since: 1.2.0
@"background-opacity-cells": bool = false,
/// Whether to blur the background when `background-opacity` is less than 1.
///
/// Valid values are:

9
src/renderer/generic.zig
View File

@ -516,6 +516,7 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
cursor_text: ?configpkg.Config.TerminalColor,
background: terminal.color.RGB,
background_opacity: f64,
background_opacity_cells: bool,
foreground: terminal.color.RGB,
selection_background: ?configpkg.Config.TerminalColor,
selection_foreground: ?configpkg.Config.TerminalColor,
@ -568,6 +569,7 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
return .{
.background_opacity = @max(0, @min(1, config.@"background-opacity")),
.background_opacity_cells = config.@"background-opacity-cells",
.font_thicken = config.@"font-thicken",
.font_thicken_strength = config.@"font-thicken-strength",
.font_features = font_features.list,
@ -2628,6 +2630,13 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
// Cells that are reversed should be fully opaque.
if (style.flags.inverse) break :bg_alpha default;
// If the user requested to have opacity on all cells, apply it.
if (self.config.background_opacity_cells and bg_style != null) {
var opacity: f64 = @floatFromInt(default);
opacity *= self.config.background_opacity;
break :bg_alpha @intFromFloat(opacity);
}
// Cells that have an explicit bg color should be fully opaque.
if (bg_style != null) break :bg_alpha default;