Add option to apply opacity to all background colors

In some cases it could be desired to apply 'background_opacity'
to all background colors instead of just 'colors.primary.background',
thus adding an 'colors.opaque_background_colors' option to control that.

Fixes #741.

2 files changed, 5 insertions, 3 deletions

diff --git a/alacritty/src/display/content.rs b/alacritty/src/display/content.rs
index 05bd0438..2deb3d3e 100644
--- a/alacritty/src/display/content.rs
+++ b/alacritty/src/display/content.rs
@@ -203,7 +203,7 @@ impl RenderableCell {
             mem::swap(&mut fg, &mut bg);
             1.0
         } else {
-            Self::compute_bg_alpha(cell.bg)
+            Self::compute_bg_alpha(&content.config.ui_config, cell.bg)
         };
 
         let is_selected = content.terminal_content.selection.map_or(false, |selection| {
@@ -350,9 +350,11 @@ impl RenderableCell {
     /// using the named input color, rather than checking the RGB of the background after its color
     /// is computed.
     #[inline]
-    fn compute_bg_alpha(bg: Color) -> f32 {
+    fn compute_bg_alpha(config: &UiConfig, bg: Color) -> f32 {
         if bg == Color::Named(NamedColor::Background) {
             0.
+        } else if config.colors.transparent_background_colors {
+            config.window_opacity()
         } else {
             1.
         }
diff --git a/alacritty/src/display/mod.rs b/alacritty/src/display/mod.rs
index cce3c8bd..d4c5c274 100644
--- a/alacritty/src/display/mod.rs
+++ b/alacritty/src/display/mod.rs
@@ -299,7 +299,7 @@ impl Display {
 
         // Disable shadows for transparent windows on macOS.
         #[cfg(target_os = "macos")]
-        window.set_has_shadow(config.ui_config.background_opacity() >= 1.0);
+        window.set_has_shadow(config.ui_config.window_opacity() >= 1.0);
 
         // On Wayland we can safely ignore this call, since the window isn't visible until you
         // actually draw something into it and commit those changes.