Add support for additional alpha when the term-window is not focused

config.h

@@ -108,6 +108,7 @@ unsigned int tabspaces = 8;
 
 /* bg opacity */
 float alpha = 0.8;
+float alphaUnfocus = 0.8;
 
 /* Terminal colors (16 first used in escape sequence) */
 static const char *colorname[] = {
@@ -144,6 +145,7 @@ unsigned int defaultfg = 259;
 unsigned int defaultbg = 258;
 unsigned int defaultcs = 256;
 unsigned int defaultrcs = 257;
+unsigned int background = 258;
 
 /*
  * Default shape of cursor
@@ -217,6 +219,7 @@ ResourcePref resources[] = {
 		{ "cwscale",      FLOAT,   &cwscale },
 		{ "chscale",      FLOAT,   &chscale },
 		{ "alpha",        FLOAT,   &alpha },
+		{ "alphaUnfocus", FLOAT,   &alphaUnfocus },
 };
 
 /*