Adding fallback support to st. - st - Simple Terminal
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---
(DIR) commit 9c44229c626ea7351a7809540435f40cffb624bc
(DIR) parent 082bab29f3551e5cee332832ff767c3fb65a5cbc
(HTM) Author: Christoph Lohmann <20h@r-36.net>
Date: Fri, 28 Dec 2012 23:52:04 +0100
Adding fallback support to st.
Diffstat:
st.c | 201 +++++++++++++++++++++++++++++--
1 file changed, 188 insertions(+), 13 deletions(-)
---
(DIR) diff --git a/st.c b/st.c
@@ -275,7 +275,9 @@ typedef struct {
int descent;
short lbearing;
short rbearing;
- XftFont *set;
+ XftFont *match;
+ FcFontSet *set;
+ FcPattern *pattern;
} Font;
/* Drawing Context */
@@ -338,10 +340,13 @@ static void xclear(int, int, int, int);
static void xdrawcursor(void);
static void xinit(void);
static void xloadcols(void);
+static int xloadfont(Font *, FcPattern *);
+static void xloadfonts(char *, int);
static void xresettitle(void);
static void xseturgency(int);
static void xsetsel(char*);
static void xtermclear(int, int, int, int);
+static void xunloadfonts(void);
static void xresize(int, int);
static void expose(XEvent *);
@@ -350,7 +355,7 @@ static void unmap(XEvent *);
static char *kmap(KeySym, uint);
static void kpress(XEvent *);
static void cmessage(XEvent *);
-static void cresize(int width, int height);
+static void cresize(int, int);
static void resize(XEvent *);
static void focus(XEvent *);
static void brelease(XEvent *);
@@ -373,7 +378,7 @@ static int isfullutf8(char *, int);
static ssize_t xwrite(int, char *, size_t);
static void *xmalloc(size_t);
static void *xrealloc(void *, size_t);
-static void *xcalloc(size_t nmemb, size_t size);
+static void *xcalloc(size_t, size_t);
static void (*handler[LASTEvent])(XEvent *) = {
[KeyPress] = kpress,
@@ -412,6 +417,28 @@ static char *opt_font = NULL;
static char *usedfont = NULL;
static int usedfontsize = 0;
+/* Font Ring Cache */
+enum {
+ FRC_NORMAL,
+ FRC_ITALIC,
+ FRC_BOLD,
+ FRC_ITALICBOLD
+};
+
+ttypedef struct {
+ XftFont *font;
+ long c;
+ int flags;
+} Fontcache;
+
+/*
+ * Fontcache is a ring buffer, with frccur as current position and frclen as
+ * the current length of used elements.
+ */
+
+static Fontcache frc[256];
+static int frccur = 0, frclen = 0;
+
ssize_t
xwrite(int fd, char *s, size_t len) {
size_t aux = len;
@@ -2282,20 +2309,28 @@ xloadfont(Font *f, FcPattern *pattern) {
FcPattern *match;
FcResult result;
- match = XftFontMatch(xw.dpy, xw.scr, pattern, &result);
+ match = FcFontMatch(NULL, pattern, &result);
if(!match)
return 1;
- if(!(f->set = XftFontOpenPattern(xw.dpy, match))) {
+
+ if(!(f->set = FcFontSort(0, match, FcTrue, 0, &result))) {
+ FcPatternDestroy(match);
+ return 1;
+ }
+
+ if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
FcPatternDestroy(match);
return 1;
}
- f->ascent = f->set->ascent;
- f->descent = f->set->descent;
+ f->pattern = FcPatternDuplicate(pattern);
+
+ f->ascent = f->match->ascent;
+ f->descent = f->match->descent;
f->lbearing = 0;
- f->rbearing = f->set->max_advance_width;
+ f->rbearing = f->match->max_advance_width;
- f->height = f->set->height;
+ f->height = f->match->height;
f->width = f->lbearing + f->rbearing;
return 0;
@@ -2334,6 +2369,9 @@ xloadfonts(char *fontstr, int fontsize) {
}
}
+ FcConfigSubstitute(0, pattern, FcMatchPattern);
+ FcDefaultSubstitute(pattern);
+
if(xloadfont(&dc.font, pattern))
die("st: can't open font %s\n", fontstr);
@@ -2359,8 +2397,40 @@ xloadfonts(char *fontstr, int fontsize) {
}
void
+xunloadfonts(void)
+{
+ int i, ip;
+
+ /*
+ * Free the loaded fonts in the font cache. This is done backwards
+ * from the frccur.
+ */
+ for (i = 0, ip = frccur; i < frclen; i++, ip--) {
+ if (ip <= 0)
+ ip = LEN(frc) - 1;
+ XftFontClose(xw.dpy, frc[ip].font);
+ }
+ frccur = 0;
+ frclen = 0;
+
+ XftFontClose(xw.dpy, dc.font.match);
+ FcPatternDestroy(dc.font.pattern);
+ FcFontSetDestroy(dc.font.set);
+ XftFontClose(xw.dpy, dc.bfont.match);
+ FcPatternDestroy(dc.bfont.pattern);
+ FcFontSetDestroy(dc.bfont.set);
+ XftFontClose(xw.dpy, dc.ifont.match);
+ FcPatternDestroy(dc.ifont.pattern);
+ FcFontSetDestroy(dc.ifont.set);
+ XftFontClose(xw.dpy, dc.ibfont.match);
+ FcPatternDestroy(dc.ibfont.pattern);
+ FcFontSetDestroy(dc.ibfont.set);
+}
+
+void
xzoom(const Arg *arg)
{
+ xunloadfonts();
xloadfonts(usedfont, usedfontsize + arg->i);
cresize(0, 0);
draw();
@@ -2379,6 +2449,9 @@ xinit(void) {
xw.vis = XDefaultVisual(xw.dpy, xw.scr);
/* font */
+ if (!FcInit())
+ die("Could not init fontconfig.\n");
+
usedfont = (opt_font == NULL)? font : opt_font;
xloadfonts(usedfont, 0);
@@ -2459,13 +2532,22 @@ xinit(void) {
void
xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
- width = charlen * xw.cw;
+ width = charlen * xw.cw, u8clen, xp, i, frp, frcflags;
+ long u8char;
+ char *u8c;
Font *font = &dc.font;
+ XftFont *sfont;
+ FcResult fcres;
+ FcPattern *fcpattern, *fontpattern;
+ FcFontSet *fcsets[] = { NULL };
+ FcCharSet *fccharset;
XGlyphInfo extents;
Colour *fg = &dc.col[base.fg], *bg = &dc.col[base.bg],
*temp, revfg, revbg;
XRenderColor colfg, colbg;
+ frcflags = FRC_NORMAL;
+
if(base.mode & ATTR_BOLD) {
if(BETWEEN(base.fg, 0, 7)) {
/* basic system colors */
@@ -2484,12 +2566,17 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
* 252 - 255 – brightest colors in greyscale
*/
font = &dc.bfont;
+ frcflags = FRC_BOLD;
}
- if(base.mode & ATTR_ITALIC)
+ if(base.mode & ATTR_ITALIC) {
font = &dc.ifont;
- if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD))
+ frcflags = FRC_ITALIC;
+ }
+ if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
font = &dc.ibfont;
+ frcflags = FRC_ITALICBOLD;
+ }
if(IS_SET(MODE_REVERSE)) {
if(fg == &dc.col[defaultfg]) {
@@ -2521,7 +2608,8 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
bg = temp;
}
- XftTextExtentsUtf8(xw.dpy, font->set, (FcChar8 *)s, bytelen,
+ /* Width of the whole string that should be printed. */
+ XftTextExtentsUtf8(xw.dpy, font->match, (FcChar8 *)s, bytelen,
&extents);
width = extents.xOff;
@@ -2539,9 +2627,96 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
if(y == term.row-1)
xclear(winx, winy + xw.ch, winx + width, xw.h);
+ /* Clean up the region we want to draw to. */
XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
+
+ /*
+ * Step through all UTF-8 characters one by one and search in the font
+ * cache ring buffer, whether there was some font found to display the
+ * unicode value of that UTF-8 character.
+ */
+ fcsets[0] = font->set;
+ for (xp = winx; bytelen > 0; ) {
+ u8c = s;
+ u8clen = utf8decode(s, &u8char);
+ s += u8clen;
+ bytelen -= u8clen;
+
+ sfont = font->match;
+ /*
+ * Only check the font cache or load new fonts, if the
+ * characters is not represented in main font.
+ */
+ if (!XftCharExists(xw.dpy, font->match, u8char)) {
+ frp = frccur;
+ /* Search the font cache. */
+ for (i = 0; i < frclen; i++, frp--) {
+ if (frp <= 0)
+ frp = LEN(frc) - 1;
+
+ if (frc[frp].c == u8char
+ && frc[frp].flags == frcflags) {
+ break;
+ }
+ }
+ if (i >= frclen) {
+ /*
+ * Nothing was found in the cache. Now use
+ * some dozen of Fontconfig calls to get the
+ * font for one single character.
+ */
+ fcpattern = FcPatternDuplicate(font->pattern);
+ fccharset = FcCharSetCreate();
+
+ FcCharSetAddChar(fccharset, u8char);
+ FcPatternAddCharSet(fcpattern, FC_CHARSET,
+ fccharset);
+ FcPatternAddBool(fcpattern, FC_SCALABLE,
+ FcTrue);
+
+ FcConfigSubstitute(0, fcpattern,
+ FcMatchPattern);
+ FcDefaultSubstitute(fcpattern);
+
+ fontpattern = FcFontSetMatch(0, fcsets,
+ FcTrue, fcpattern, &fcres);
+
+ frccur++;
+ frclen++;
+ if (frccur >= LEN(frc))
+ frccur = 0;
+ if (frclen >= LEN(frc)) {
+ frclen = LEN(frc);
+ XftFontClose(xw.dpy, frc[frccur].font);
+ }
+
+ /*
+ * Overwrite or create the new cache entry
+ * entry.
+ */
+ frc[frccur].font = XftFontOpenPattern(xw.dpy,
+ fontpattern);
+ frc[frccur].c = u8char;
+ frc[frccur].flags = frcflags;
+
+ FcPatternDestroy(fcpattern);
+ FcCharSetDestroy(fccharset);
+
+ frp = frccur;
+ }
+ sfont = frc[frp].font;
+ }
+
+ XftDrawStringUtf8(xw.draw, fg, sfont, xp, winy + sfont->ascent,
+ (FcChar8 *)u8c, u8clen);
+
+ xp += font->width;
+ }
+
+ /*
XftDrawStringUtf8(xw.draw, fg, font->set, winx,
winy + font->ascent, (FcChar8 *)s, bytelen);
+ */
if(base.mode & ATTR_UNDERLINE) {
XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,