2 files changed, 55 insertions, 2 deletions
diff --git a/src/main.rs b/src/main.rs
index 436fcfa..2c07e95 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,5 @@
 use crate::xtypes::*;
+use crate::xcolor::DisplayColorExt;
 
 use std::sync::Arc;
 
@@ -12,6 +13,7 @@ use xcb::x::{
   WindowClass
 };
 
+mod xcolor;
 mod xtypes;
 
 
@@ -21,6 +23,7 @@ enum ScreenSide { Top, Bottom, Left, Right }
 struct DockConfiguration {
   thickness: u16,
   side: ScreenSide,
+  background_pixel: u32,
 }
 
 struct Dock {
@@ -46,9 +49,13 @@ struct Rectangle<T> {
 fn main() -> xcb::Result<()> {
   let display = Arc::new(Display::new()?);
 
+  // #d4ffcc
+  let background_pixel = display.allocate_color(54484, 65535, 52428)?;
+
   let _dock = Dock::new(Arc::clone(&display), DockConfiguration {
     thickness: 50,
     side: ScreenSide::Bottom,
+    background_pixel,
   })?;
 
   loop {
@@ -81,6 +88,7 @@ impl Dock {
 
     let dock_bounds = Dock::compute_bounds(&screen, &configuration);
 
+    println!("back pixel {:?}", configuration.background_pixel);
     let window = Window::new(Arc::clone(&display), &mut CreateWindow {
       depth: x::COPY_FROM_PARENT as u8,
       wid: x::Window::none(),
@@ -93,7 +101,7 @@ impl Dock {
       class: WindowClass::InputOutput,
       visual: screen.root_visual(),
       value_list: &[
-        Cw::BackPixel(screen.black_pixel()),
+        Cw::BackPixel(configuration.background_pixel),
         Cw::EventMask(EventMask::EXPOSURE | EventMask::BUTTON_PRESS),
       ],
     })?;
@@ -189,6 +197,5 @@ impl Dock {
       Rectangle { left, top, width, height }
     }
   }
-
 }
 
diff --git a/src/xcolor.rs b/src/xcolor.rs
new file mode 100644
index 0000000..0fab0c8
--- /dev/null
+++ b/src/xcolor.rs
@@ -0,0 +1,46 @@
+/*   Color management in X has become an obscure topic because everyone prefers
+ * to assume they have 24-bit direct. In dealing with it, [1] has been an
+ * important resource.
+ *
+ * [1] https://xcb.freedesktop.org/xlibtoxcbtranslationguide/
+ */
+use crate::xtypes::*;
+
+use xcb::x::{ AllocColor, Visualtype };
+
+
+pub trait DisplayColorExt: DisplayExt {
+  /*   This is sufficiently obscure knowledge that it's worth keeping here
+   * even though it's unused.
+   */
+  #[allow(dead_code)]
+  fn find_root_visual(&self) -> Option<&Visualtype> {
+    let visual_id = self.screen().root_visual();
+
+    for depth in self.screen().allowed_depths() {
+      for visual in depth.visuals() {
+        if visual_id == visual.visual_id() {
+          return Some(visual);
+        }
+      }
+    }
+
+    None
+  }
+
+  fn allocate_color(&self, red: u16, green: u16, blue: u16)
+    -> xcb::Result<u32>
+  {
+    let colormap = self.screen().default_colormap();
+
+    let cookie = self.send_request(&AllocColor {
+      cmap: colormap,
+      red, green, blue,
+    });
+
+    Ok(self.wait_for_reply(cookie)?.pixel())
+  }
+}
+
+impl<T: DisplayExt> DisplayColorExt for T { }
+