From a65d6a11cb82719a649110a8deaeb8f87e1c374b Mon Sep 17 00:00:00 2001
From: Greg V <greg@unrelenting.technology>
Date: Sun, 31 May 2020 16:53:57 +0300
Subject: Add custom window background/clear color (incl. transparency)
 support, fixes #272

wgpu would currently ignore the alpha: https://github.com/gfx-rs/wgpu/issues/687

glow (and naively patched wgpu) requires premultiplied alpha, so if you don't
multiply the RGB by the A right now, the semi-transparent color would be wrong
(too bright).

winit with_transparent doesn't seem necessary.
---
 src/settings.rs | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

(limited to 'src/settings.rs')

diff --git a/src/settings.rs b/src/settings.rs
index 01ad0ee0..1aa17571 100644
--- a/src/settings.rs
+++ b/src/settings.rs
@@ -1,8 +1,8 @@
 //! Configure your application.
-use crate::window;
+use crate::{window, Color};
 
 /// The settings of an application.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+#[derive(Debug, Clone, Copy, PartialEq)]
 pub struct Settings<Flags> {
     /// The window settings.
     ///
@@ -32,6 +32,29 @@ pub struct Settings<Flags> {
     ///
     /// [`Canvas`]: ../widget/canvas/struct.Canvas.html
     pub antialiasing: bool,
+
+    /// The background color of the window.
+    ///
+    /// On supported backends, this makes it possible to have
+    /// (semi-)transparent windows.
+    ///
+    /// By default, it is white.
+    pub background_color: Color,
+}
+
+impl<Flags> Default for Settings<Flags>
+where
+    Flags: Default,
+{
+    fn default() -> Self {
+        Self {
+            flags: Default::default(),
+            antialiasing: Default::default(),
+            default_font: Default::default(),
+            window: Default::default(),
+            background_color: Color::WHITE,
+        }
+    }
 }
 
 impl<Flags> Settings<Flags> {
@@ -46,6 +69,7 @@ impl<Flags> Settings<Flags> {
             antialiasing: Default::default(),
             default_font: Default::default(),
             window: Default::default(),
+            background_color: Color::WHITE,
         }
     }
 }
-- 
cgit