From be340a8cd822be1ea0fe4c1b1f3a62ca66d705b4 Mon Sep 17 00:00:00 2001
From: Héctor Ramón Jiménez <hector@hecrj.dev>
Date: Tue, 19 Sep 2023 23:00:20 +0200
Subject: Fix gamma correction for colored glyphs in `iced_wgpu`

---
 core/src/color.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'core/src')

diff --git a/core/src/color.rs b/core/src/color.rs
index 1392f28b..cce8b340 100644
--- a/core/src/color.rs
+++ b/core/src/color.rs
@@ -89,6 +89,26 @@ impl Color {
         }
     }
 
+    /// Creates a [`Color`] from its linear RGBA components.
+    pub fn from_linear_rgba(r: f32, g: f32, b: f32, a: f32) -> Self {
+        // As described in:
+        // https://en.wikipedia.org/wiki/SRGB
+        fn gamma_component(u: f32) -> f32 {
+            if u < 0.0031308 {
+                12.92 * u
+            } else {
+                1.055 * u.powf(1.0 / 2.4) - 0.055
+            }
+        }
+
+        Self {
+            r: gamma_component(r),
+            g: gamma_component(g),
+            b: gamma_component(b),
+            a,
+        }
+    }
+
     /// Converts the [`Color`] into its RGBA8 equivalent.
     #[must_use]
     pub fn into_rgba8(self) -> [u8; 4] {
-- 
cgit