feat(palette): add a translucent scrim role for fullscreen overlays

The power menu's ground was a hardcoded rgba(36, 39, 58, 0.88),
Macchiato's base, so every other scheme drew its overlay with a
Macchiato tint. Each roles file now defines scrim as its own
background at 88% alpha, udt-palette emits it into palette.rasi, and
powermenu.rasi uses @scrim.

scrim is the first translucent palette entry, so udt-accent's QML
palette no longer drops the alpha pair: an opaque colour still goes
out as #rrggbb, a translucent one as QML's #aarrggbb.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

13 files changed, 50 insertions, 7 deletions

diff --git a/bin/udt-accent b/bin/udt-accent
index e366bb1..72d3a64 100755
--- a/bin/udt-accent
+++ b/bin/udt-accent
@@ -242,9 +242,9 @@ def write_hyprlock_border(name):
 def read_palette():
     """Parse palette.rasi into {name: "#rrggbb"}.
 
-    rofi writes colours as #rrggbbaa; QML wants #rrggbb, and every entry in
-    that file is fully opaque, so the alpha pair is dropped rather than
-    converted. Returns an empty dict if the file is missing, which leaves the
+    rofi writes colours as #rrggbbaa; QML wants #rrggbb, or #aarrggbb when
+    translucent. Only scrim is, so an opaque alpha pair is dropped and any
+    other is moved to the front. Returns an empty dict if the file is missing, which leaves the
     QML palette to fall back to its own defaults.
     """
     try:
@@ -254,7 +254,8 @@ def read_palette():
 
     found = {}
     for key, value in re.findall(r"(\w+):\s*#([0-9a-fA-F]{6,8})\s*;", text):
-        found[key] = "#" + value[:6]
+        alpha = value[6:].lower()
+        found[key] = "#" + (alpha if alpha not in ("", "ff") else "") + value[:6]
     return found
 
 
diff --git a/bin/udt-palette b/bin/udt-palette
index f603899..234d97a 100755
--- a/bin/udt-palette
+++ b/bin/udt-palette
@@ -151,6 +151,8 @@ ROFI_NAMES = [
     # the active border, which is magenta under candy-night; termblue is the
     # terminal's blue, a real blue in every scheme but Dracula, which has none.
     ("peach", "peach"), ("mauve", "highlight"), ("termblue", "blue"),
+    # The one translucent entry: the fullscreen overlays' ground.
+    ("scrim", "scrim"),
 ]
 
 
diff --git a/palette/roles-candy-night.conf b/palette/roles-candy-night.conf
index c3fc514..58bb7a6 100644
--- a/palette/roles-candy-night.conf
+++ b/palette/roles-candy-night.conf
@@ -16,6 +16,10 @@ surface     = surface
 surface_alt = selection
 border      = gutter
 
+# The translucent ground behind a fullscreen overlay (power menu, screenshot
+# menu): the background, faded so the session shows through.
+scrim       = background/88
+
 fg          = foreground
 fg_dim      = light
 fg_faint    = comment
diff --git a/palette/roles-dracula.conf b/palette/roles-dracula.conf
index 4ff2485..26ca7a7 100644
--- a/palette/roles-dracula.conf
+++ b/palette/roles-dracula.conf
@@ -14,6 +14,10 @@ surface     = surface_mid
 surface_alt = current_line
 border      = current_line
 
+# The translucent ground behind a fullscreen overlay (power menu, screenshot
+# menu): the background, faded so the session shows through.
+scrim       = background/88
+
 fg          = foreground
 fg_dim      = comment
 fg_faint    = surface_high
diff --git a/palette/roles-frappe.conf b/palette/roles-frappe.conf
index dec2879..2fc4704 100644
--- a/palette/roles-frappe.conf
+++ b/palette/roles-frappe.conf
@@ -14,6 +14,10 @@ surface     = surface0
 surface_alt = surface1
 border      = surface1
 
+# The translucent ground behind a fullscreen overlay (power menu, screenshot
+# menu): the background, faded so the session shows through.
+scrim       = base/88
+
 # Text, brightest to dimmest.
 fg          = text
 fg_dim      = subtext0
diff --git a/palette/roles-macchiato.conf b/palette/roles-macchiato.conf
index aa34d7b..dcbe493 100644
--- a/palette/roles-macchiato.conf
+++ b/palette/roles-macchiato.conf
@@ -14,6 +14,10 @@ surface     = surface0
 surface_alt = surface1
 border      = surface1
 
+# The translucent ground behind a fullscreen overlay (power menu, screenshot
+# menu): the background, faded so the session shows through.
+scrim       = base/88
+
 # Text, brightest to dimmest.
 fg          = text
 fg_dim      = subtext0
diff --git a/palette/roles-material-darker.conf b/palette/roles-material-darker.conf
index bfbe8ae..4d5d50f 100644
--- a/palette/roles-material-darker.conf
+++ b/palette/roles-material-darker.conf
@@ -14,6 +14,10 @@ surface     = surface
 surface_alt = selection
 border      = mid_high
 
+# The translucent ground behind a fullscreen overlay (power menu, screenshot
+# menu): the background, faded so the session shows through.
+scrim       = background/88
+
 fg          = foreground
 fg_dim      = light
 fg_faint    = comment
diff --git a/palette/roles-material-ocean.conf b/palette/roles-material-ocean.conf
index 3e89c46..d3bf906 100644
--- a/palette/roles-material-ocean.conf
+++ b/palette/roles-material-ocean.conf
@@ -14,6 +14,10 @@ surface     = surface
 surface_alt = selection
 border      = mid_high
 
+# The translucent ground behind a fullscreen overlay (power menu, screenshot
+# menu): the background, faded so the session shows through.
+scrim       = background/88
+
 fg          = foreground
 fg_dim      = light
 fg_faint    = comment
diff --git a/palette/roles-material-palenight.conf b/palette/roles-material-palenight.conf
index 22edb5a..de42201 100644
--- a/palette/roles-material-palenight.conf
+++ b/palette/roles-material-palenight.conf
@@ -14,6 +14,10 @@ surface     = surface
 surface_alt = selection
 border      = mid_high
 
+# The translucent ground behind a fullscreen overlay (power menu, screenshot
+# menu): the background, faded so the session shows through.
+scrim       = background/88
+
 fg          = foreground
 fg_dim      = light
 fg_faint    = comment
diff --git a/palette/roles-mocha.conf b/palette/roles-mocha.conf
index 395955a..389d89d 100644
--- a/palette/roles-mocha.conf
+++ b/palette/roles-mocha.conf
@@ -14,6 +14,10 @@ surface     = surface0
 surface_alt = surface1
 border      = surface1
 
+# The translucent ground behind a fullscreen overlay (power menu, screenshot
+# menu): the background, faded so the session shows through.
+scrim       = base/88
+
 # Text, brightest to dimmest.
 fg          = text
 fg_dim      = subtext0
diff --git a/palette/roles-nord.conf b/palette/roles-nord.conf
index eac750a..5881ba6 100644
--- a/palette/roles-nord.conf
+++ b/palette/roles-nord.conf
@@ -14,6 +14,10 @@ surface     = nord1
 surface_alt = nord2
 border      = nord3
 
+# The translucent ground behind a fullscreen overlay (power menu, screenshot
+# menu): the background, faded so the session shows through.
+scrim       = nord0/88
+
 fg          = nord4
 fg_dim      = nord4
 fg_faint    = nord3
diff --git a/palette/roles-tokyo-night.conf b/palette/roles-tokyo-night.conf
index cd02e3c..5c9eb27 100644
--- a/palette/roles-tokyo-night.conf
+++ b/palette/roles-tokyo-night.conf
@@ -13,6 +13,10 @@ surface     = bg_highlight
 surface_alt = bg_visual
 border      = fg_gutter
 
+# The translucent ground behind a fullscreen overlay (power menu, screenshot
+# menu): the background, faded so the session shows through.
+scrim       = bg/88
+
 fg          = fg
 fg_dim      = fg_dark
 fg_faint    = comment
diff --git a/rofi/udt/powermenu.rasi b/rofi/udt/powermenu.rasi
index d2c885a..92c5b07 100644
--- a/rofi/udt/powermenu.rasi
+++ b/rofi/udt/powermenu.rasi
@@ -12,11 +12,11 @@
 
 /* The fullscreen ground is translucent so the desktop stays faintly visible
  * behind it, which keeps the overlay reading as a layer over the session
- * rather than a screen the session was replaced by. Written as an explicit
- * rgba rather than @base, since the palette entries are fully opaque. */
+ * rather than a screen the session was replaced by. @scrim is the scheme's
+ * background at 88% alpha, the one translucent palette entry. */
 window {
     fullscreen:       true;
-    background-color: rgba(36, 39, 58, 0.88);
+    background-color: @scrim;
     border:           0;
     border-radius:    0;
     padding:          0;