colors: Darken bg if contrast is too low.

2 files changed, 20 insertions, 3 deletions

diff --git a/pywal/colors.py b/pywal/colors.py
index c939215..b2c390e 100644
--- a/pywal/colors.py
+++ b/pywal/colors.py
@@ -54,6 +54,13 @@ def sort_colors(img, colors):
        we will later save in json format."""
     raw_colors = colors[:1] + colors[9:] + colors[8:]
 
+    # Darken the background color if it's too light.
+    if int(raw_colors[0][1]) in [3, 4]:
+        raw_colors[0] = util.darken_color(raw_colors[0], 0.50)
+
+    elif int(raw_colors[0][1]) >= 5:
+        raw_colors[0] = util.darken_color(raw_colors[0], 0.25)
+
     colors = {"wallpaper": img}
 
     colors_special = {}
diff --git a/pywal/util.py b/pywal/util.py
index 06c0510..2f86811 100644
--- a/pywal/util.py
+++ b/pywal/util.py
@@ -20,7 +20,8 @@ class Color:
     @property
     def rgb(self):
         """Convert a hex color to rgb."""
-        return hex_to_rgb(self.hex_color)
+        red, green, blue = hex_to_rgb(self.hex_color)
+        return f"{red},{green},{blue}"
 
     @property
     def xrgba(self):
@@ -99,8 +100,7 @@ def create_dir(directory):
 
 def hex_to_rgb(color):
     """Convert a hex color to rgb."""
-    red, green, blue = list(bytes.fromhex(color.strip("#")))
-    return f"{red},{green},{blue}"
+    return tuple(bytes.fromhex(color.strip("#")))
 
 
 def hex_to_xrgba(color):
@@ -109,6 +109,16 @@ def hex_to_xrgba(color):
     return f"{col[1]}{col[2]}/{col[3]}{col[4]}/{col[5]}{col[6]}/ff"
 
 
+def rgb_to_hex(color):
+    """Convert an rgb color to hex."""
+    return f"#{color[0]:02x}{color[1]:02x}{color[2]:02x}"
+
+
+def darken_color(color, darkness):
+    """Darken a hex color."""
+    return rgb_to_hex([int(col * (1 - darkness)) for col in hex_to_rgb(color)])
+
+
 def disown(*cmd):
     """Call a system command in the background,
        disown it and hide it's output."""