Refactor xsetcolorname()

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

Signed-off-by: Christoph Lohmann <20h@r-36.net>

diff --git a/st.c b/st.c
index 79a4e0a..beae9bc 100644 (file)
--- a/st.c
+++ b/st.c
@@ -2757,32 +2757,28 @@ 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;
 }