st

fork of suckless's simple terminal
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commit 8c99915608beee03eca3bae6ed92264a0da87e2f
parent 7854fde1ff95ba85239ccfe1b59b555bd245d0db
Author: Quentin Rameau <quinq@fifth.space>
Date:   Sat, 22 Oct 2016 16:36:10 +0200

Do not use color when font attributes are supported

If fontconfig gives us a font without the attributes we asked for,
display an alternative color instead.

Diffstat:
Mconfig.def.h | 8+++-----
Mst.c | 40++++++++++++++++++++++++++++++++--------
2 files changed, 35 insertions(+), 13 deletions(-)
diff --git a/config.def.h b/config.def.h
@@ -138,12 +138,10 @@ static unsigned int mousefg = 7;
 static unsigned int mousebg = 0;
 
 /*
- * Colors used, when the specific fg == defaultfg. So in reverse mode this
- * will reverse too. Another logic would only make the simple feature too
- * complex.
+ * Color used to display font attributes when fontconfig selected a font which
+ * doesn't match the ones requested.
  */
-static unsigned int defaultitalic = 11;
-static unsigned int defaultunderline = 7;
+static unsigned int defaultattr = 11;
 
 /*
  * Internal mouse shortcuts.
diff --git a/st.c b/st.c
@@ -354,6 +354,8 @@ typedef struct {
     int width;
     int ascent;
     int descent;
+    int badslant;
+    int badweight;
     short lbearing;
     short rbearing;
     XftFont *match;
@@ -3373,6 +3375,7 @@ xloadfont(Font *f, FcPattern *pattern)
     FcPattern *match;
     FcResult result;
     XGlyphInfo extents;
+    int wantattr, haveattr;
 
     match = XftFontMatch(xw.dpy, xw.scr, pattern, &result);
     if (!match)
@@ -3383,6 +3386,28 @@ xloadfont(Font *f, FcPattern *pattern)
         return 1;
     }
 
+    if ((XftPatternGetInteger(pattern, "slant", 0, &wantattr) ==
+        XftResultMatch)) {
+        /*
+         * Check if xft was unable to find a font with the appropriate
+         * slant but gave us one anyway. Try to mitigate.
+         */
+        if ((XftPatternGetInteger(f->match->pattern, "slant", 0,
+            &haveattr) != XftResultMatch) || haveattr < wantattr) {
+            f->badslant = 1;
+            fputs("st: font slant does not match\n", stderr);
+        }
+    }
+
+    if ((XftPatternGetInteger(pattern, "weight", 0, &wantattr) ==
+        XftResultMatch)) {
+        if ((XftPatternGetInteger(f->match->pattern, "weight", 0,
+            &haveattr) != XftResultMatch) || haveattr != wantattr) {
+            f->badweight = 1;
+            fputs("st: font weight does not match\n", stderr);
+        }
+    }
+
     XftTextExtentsUtf8(xw.dpy, f->match,
         (const FcChar8 *) ascii_printable,
         strlen(ascii_printable), &extents);
@@ -3780,14 +3805,13 @@ xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, i
     XRenderColor colfg, colbg;
     XRectangle r;
 
-    /* Determine foreground and background colors based on mode. */
-    if (base.fg == defaultfg) {
-        if (base.mode & ATTR_ITALIC)
-            base.fg = defaultitalic;
-        else if ((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD))
-            base.fg = defaultitalic;
-        else if (base.mode & ATTR_UNDERLINE)
-            base.fg = defaultunderline;
+    /* Fallback on color display for attributes not supported by the font */
+    if (base.mode & ATTR_ITALIC && base.mode & ATTR_BOLD) {
+        if (dc.ibfont.badslant || dc.ibfont.badweight)
+            base.fg = defaultattr;
+    } else if ((base.mode & ATTR_ITALIC && dc.ifont.badslant) ||
+        (base.mode & ATTR_BOLD && dc.bfont.badweight)) {
+        base.fg = defaultattr;
     }
 
     if (IS_TRUECOL(base.fg)) {