[dev] [st] parse relative font size instead of pixelsize

[Nils Reuße]

Hi suckless@,

i tried to set a font and fontsize in config.h with the xft notation 
FONT-SIZE:

    static char font[] = "Source Code Pro Medium-18:style=Regular";

The font was recognized, but not the font size, defaulting to 12.  The 
same was true when i used the size attribute:

    static char font[] = "Source Code Pro Medium:style=Regular:size=18";

After figuring out that only the attribute 'pixelsize' works, i changed 
all occurrences of FC_PIXEL_SIZE to FC_SIZE in st.c (latest git, patch 
below), and now it works with size (but obviously breaks with pixelsize).

I prefer size over pixelsize because size scales to the current display 
resolution, while pixelsize has to be increased (either in config.h or 
on starting st), e.g. if you switch between a non-hd (home) and hd 
screen (work).

What do you think?

Best,
Nils


diff --git a/st.c b/st.c
index f883ac1..e888f32 100644
--- a/st.c
+++ b/st.c
@@ -2841,11 +2841,11 @@ xloadfonts(char *fontstr, int fontsize) {
                die("st: can't open font %s\n", fontstr);

        if(fontsize > 0) {
-               FcPatternDel(pattern, FC_PIXEL_SIZE);
-               FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
+               FcPatternDel(pattern, FC_SIZE);
+               FcPatternAddDouble(pattern, FC_SIZE, (double)fontsize);
                usedfontsize = fontsize;
        } else {
-               result = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, 
&fontval);
+               result = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
                if(result == FcResultMatch) {
                        usedfontsize = (int)fontval;
                } else {
@@ -2853,7 +2853,7 @@ xloadfonts(char *fontstr, int fontsize) {
                         * Default font size is 12, if none given. This is to
                         * have a known usedfontsize value.
                         */
-                       FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
+                       FcPatternAddDouble(pattern, FC_SIZE, 12);
                        usedfontsize = 12;
                }
        }