[PATCH] Refactor xsetcolorname()

From: FRIGN <dev_AT_frign.de>
Date: Sun, 25 May 2014 12:13:22 +0200

I mainly improved the slightly off algorithm used to load colours in the 256-colour-space and
removed unnecessary local values (r,g,b,colour).
"colour" is not necessary as a punchbag for XftColorAlloc[Value,Name], as they don't mess with
the result-adress until they are absolutely sure everything worked out[0].

Being at it, I changed the error-returns for AllocValue to dies (just like in xloadcols()), as
a failure is most likely an OOM-situation you better catch early.
In case of an invalid name everything stays the same.

[0]: http://www.opensource.apple.com/source/X11libs/X11libs-40/libXft/libXft-2.1.13/src/xftcolor.c

---
 st.c | 32 ++++++++++++++------------------
 1 file changed, 14 insertions(+), 18 deletions(-)
diff --git a/st.c b/st.c
index 6424b54..c37576e 100644
--- a/st.c
+++ b/st.c
_AT_@ -2755,32 +2755,28 @@ xloadcols(void) {
 int
 xsetcolorname(int x, const char *name) {
 	XRenderColor color = { .alpha = 0xffff };
-	Colour colour;
+
 	if(!BETWEEN(x, 0, LEN(colorname)))
 		return -1;
 	if(!name) {
-		if(BETWEEN(x, 16, 16 + 215)) {
-			int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
-			color.red = sixd_to_16bit(r);
-			color.green = sixd_to_16bit(g);
-			color.blue = sixd_to_16bit(b);
-			if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
-				return 0; /* something went wrong */
-			dc.col[x] = colour;
+		if(BETWEEN(x, 16, 6*6*6+16)) { /* 256 colour */
+			color.red   = sixd_to_16bit( ((x-16)/36)%6 );
+			color.green = sixd_to_16bit( ((x-16)/6) %6 );
+			color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
+			if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[x]))
+				die("Could not allocate color %d\n", x);
 			return 1;
-		} else if(BETWEEN(x, 16 + 216, 255)) {
-			color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
-			if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
-				return 0; /* something went wrong */
-			dc.col[x] = colour;
+		} else if(BETWEEN(x, 6*6*6+16, 255)) { /* grayscale */
+			color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x-(6*6*6+16));
+			if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[x]))
+				die("Could not allocate color %d\n", x);
 			return 1;
-		} else {
+		} else { /* system colours */
 			name = colorname[x];
 		}
 	}
-	if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
-		return 0;
-	dc.col[x] = colour;
+	if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &dc.col[x]))
+		return 0; /* invalid name */
 	return 1;
 }
 
-- 
1.8.3.2
--Multipart=_Sun__25_May_2014_12_23_43_+0200_/axq.C=.BlZVAsy=--

Received on Mon Sep 17 2001 - 00:00:00 CEST