From 2848d0359a8bc433ba9de56ccc93a04d2f6bbdf2 Mon Sep 17 00:00:00 2001
From: Wolfgang Ulbrich <chat-to-me@raveit.de>
Date: Fri, 8 Jan 2016 20:16:20 +0100
Subject: GTK3 eel-gdk-extensions: add eel_make_color_inactive() to public API

taken from:
https://git.gnome.org/browse/nautilus/commit/?h=gnome-3-0&id=42e7268
---
 eel/eel-gdk-extensions.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'eel/eel-gdk-extensions.c')

diff --git a/eel/eel-gdk-extensions.c b/eel/eel-gdk-extensions.c
index 3d68d9a5..bbb8a69a 100644
--- a/eel/eel-gdk-extensions.c
+++ b/eel/eel-gdk-extensions.c
@@ -510,6 +510,38 @@ eel_gdk_draw_layout_with_drop_shadow (GdkDrawable         *drawable,
 #endif
 }
 
+#if GTK_CHECK_VERSION(3,0,0)
+#define CLAMP_COLOR(v) (t = (v), CLAMP (t, 0, G_MAXUSHORT))
+#define SATURATE(v) ((1.0 - saturation) * intensity + saturation * (v))
+
+void
+eel_make_color_inactive (GdkColor *color)
+{
+    double intensity, saturation;
+    gushort t;
+
+    saturation = 0.7;
+    intensity = color->red * 0.30 + color->green * 0.59 + color->blue * 0.11;
+    color->red = SATURATE (color->red);
+    color->green = SATURATE (color->green);
+    color->blue = SATURATE (color->blue);
+
+    if (intensity > G_MAXUSHORT / 2) {
+            color->red *= 0.9;
+            color->green *= 0.9;
+            color->blue *= 0.9;
+    } else {
+            color->red *= 1.25;
+            color->green *= 1.25;
+            color->blue *= 1.25;
+    }
+
+    color->red = CLAMP_COLOR (color->red);
+    color->green = CLAMP_COLOR (color->green);
+    color->blue = CLAMP_COLOR (color->blue);
+}
+#endif
+
 #if ! defined (EEL_OMIT_SELF_CHECK)
 
 static char *
-- 
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