[hackers] [libsl] Add Xft and follback-fonts support to graphics lib || Eric Pruitt
commit 4ef363a6c7f0265024845e151a5fe7dcaefb3ee1
Author: Eric Pruitt <eric.pruitt_AT_gmail.com>
Date: Thu Mar 5 20:28:49 2015 -0800
Add Xft and follback-fonts support to graphics lib
diff --git a/drw.c b/drw.c
index b130405..eb3b3c3 100644
--- a/drw.c
+++ b/drw.c
_AT_@ -3,10 +3,59 @@
#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
+#include <X11/Xft/Xft.h>
#include "drw.h"
#include "util.h"
+#define UTF_INVALID 0xFFFD
+#define UTF_SIZ 4
+
+static const unsigned char utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
+static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
+static const long utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};
+static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
+
+static long
+utf8decodebyte(const char c, size_t *i) {
+ for(*i = 0; *i < (UTF_SIZ + 1); ++(*i))
+ if(((unsigned char)c & utfmask[*i]) == utfbyte[*i])
+ return (unsigned char)c & ~utfmask[*i];
+ return 0;
+}
+
+static size_t
+utf8validate(long *u, size_t i) {
+ if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
+ *u = UTF_INVALID;
+ for(i = 1; *u > utfmax[i]; ++i)
+ ;
+ return i;
+}
+
+static size_t
+utf8decode(const char *c, long *u, size_t clen) {
+ size_t i, j, len, type;
+ long udecoded;
+
+ *u = UTF_INVALID;
+ if(!clen)
+ return 0;
+ udecoded = utf8decodebyte(c[0], &len);
+ if(!BETWEEN(len, 1, UTF_SIZ))
+ return 1;
+ for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
+ udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
+ if(type != 0)
+ return j;
+ }
+ if(j < len)
+ return 0;
+ *u = udecoded;
+ utf8validate(u, len);
+ return len;
+}
+
Drw *
drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h) {
Drw *drw = (Drw *)calloc(1, sizeof(Drw));
_AT_@ -19,6 +68,7 @@ drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h
drw->h = h;
drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
drw->gc = XCreateGC(dpy, root, 0, NULL);
+ drw->fontcount = 0;
XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
return drw;
}
_AT_@ -36,56 +86,88 @@ drw_resize(Drw *drw, unsigned int w, unsigned int h) {
void
drw_free(Drw *drw) {
+ size_t i;
+ for (i = 0; i < drw->fontcount; i++) {
+ drw_font_free(drw->fonts[i]);
+ }
XFreePixmap(drw->dpy, drw->drawable);
XFreeGC(drw->dpy, drw->gc);
free(drw);
}
-Fnt *
-drw_font_create(Display *dpy, const char *fontname) {
+/* This function is an implementation detail. Library users should use
+ * drw_font_create instead.
+ */
+static Fnt *
+drw_font_xcreate(Drw *drw, const char *fontname, FcPattern *fontpattern) {
Fnt *font;
- char *def, **missing;
- int n;
- font = (Fnt *)calloc(1, sizeof(Fnt));
- if(!font)
+ if (!(fontname || fontpattern))
+ die("No font specified.\n");
+
+ if (!(font = (Fnt *)calloc(1, sizeof(Fnt))))
return NULL;
- font->set = XCreateFontSet(dpy, fontname, &missing, &n, &def);
- if(missing) {
- while(n--)
- fprintf(stderr, "drw: missing fontset: %s\n", missing[n]);
- XFreeStringList(missing);
- }
- if(font->set) {
- XFontStruct **xfonts;
- char **font_names;
- XExtentsOfFontSet(font->set);
- n = XFontsOfFontSet(font->set, &xfonts, &font_names);
- while(n--) {
- font->ascent = MAX(font->ascent, (*xfonts)->ascent);
- font->descent = MAX(font->descent,(*xfonts)->descent);
- xfonts++;
+
+ if (fontname) {
+ /* Using the pattern found at font->xfont->pattern does not yield same
+ * the same substitution results as using the pattern returned by
+ * FcNameParse; using the latter results in the desired fallback
+ * behaviour whereas the former just results in
+ * missing-character-rectangles being drawn, at least with some fonts.
+ */
+ if (!(font->xfont = XftFontOpenName(drw->dpy, drw->screen, fontname)) ||
+ !(font->pattern = FcNameParse((FcChar8 *) fontname))) {
+ if (font->xfont) {
+ XftFontClose(drw->dpy, font->xfont);
+ font->xfont = NULL;
+ }
+ fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
+ }
+ } else if (fontpattern) {
+ if (!(font->xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
+ fprintf(stderr, "error, cannot load font pattern.\n");
+ } else {
+ font->pattern = NULL;
}
}
- else {
- if(!(font->xfont = XLoadQueryFont(dpy, fontname))
- && !(font->xfont = XLoadQueryFont(dpy, "fixed")))
- die("error, cannot load font: '%s'\n", fontname);
- font->ascent = font->xfont->ascent;
- font->descent = font->xfont->descent;
+
+ if (!font->xfont) {
+ free(font);
+ return NULL;
}
+
+ font->ascent = font->xfont->ascent;
+ font->descent = font->xfont->descent;
font->h = font->ascent + font->descent;
+ font->dpy = drw->dpy;
return font;
}
+Fnt*
+drw_font_create(Drw *drw, const char *fontname) {
+ return drw_font_xcreate(drw, fontname, NULL);
+}
+
+void
+drw_load_fonts(Drw* drw, const char *fonts[], size_t fontcount) {
+ size_t i;
+ Fnt *font;
+ for (i = 0; i < fontcount; i++) {
+ if (drw->fontcount >= DRW_FONT_CACHE_SIZE) {
+ die("Font cache exhausted.\n");
+ } else if ((font = drw_font_xcreate(drw, fonts[i], NULL))) {
+ drw->fonts[drw->fontcount++] = font;
+ }
+ }
+}
+
void
-drw_font_free(Display *dpy, Fnt *font) {
+drw_font_free(Fnt *font) {
if(!font)
return;
- if(font->set)
- XFreeFontSet(dpy, font->set);
- else
- XFreeFont(dpy, font->xfont);
+ if(font->pattern)
+ FcPatternDestroy(font->pattern);
+ XftFontClose(font->dpy, font->xfont);
free(font);
}
_AT_@ -93,7 +175,7 @@ Clr *
drw_clr_create(Drw *drw, const char *clrname) {
Clr *clr;
Colormap cmap;
- XColor color;
+ Visual *vis;
if(!drw)
return NULL;
_AT_@ -101,9 +183,10 @@ drw_clr_create(Drw *drw, const char *clrname) {
if(!clr)
return NULL;
cmap = DefaultColormap(drw->dpy, drw->screen);
- if(!XAllocNamedColor(drw->dpy, cmap, clrname, &color, &color))
+ vis = DefaultVisual(drw->dpy, drw->screen);
+ if(!XftColorAllocName(drw->dpy, vis, cmap, clrname, &clr->rgb))
die("error, cannot allocate color '%s'\n", clrname);
- clr->rgb = color.pixel;
+ clr->pix = clr->rgb.pixel;
return clr;
}
_AT_@ -114,14 +197,8 @@ drw_clr_free(Clr *clr) {
}
void
-drw_setfont(Drw *drw, Fnt *font) {
- if(drw)
- drw->font = font;
-}
-
-void
drw_setscheme(Drw *drw, ClrScheme *scheme) {
- if(drw && scheme)
+ if(drw && scheme)
drw->scheme = scheme;
}
_AT_@ -129,46 +206,160 @@ void
drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int empty, int invert) {
int dx;
- if(!drw || !drw->font || !drw->scheme)
+ if(!drw || !drw->fontcount || !drw->scheme)
return;
- XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->bg->rgb : drw->scheme->fg->rgb);
- dx = (drw->font->ascent + drw->font->descent + 2) / 4;
+ XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->bg->pix : drw->scheme->fg->pix);
+ dx = (drw->fonts[0]->ascent + drw->fonts[0]->descent + 2) / 4;
if(filled)
XFillRectangle(drw->dpy, drw->drawable, drw->gc, x+1, y+1, dx+1, dx+1);
else if(empty)
XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x+1, y+1, dx, dx);
}
-void
+int
drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert) {
- char buf[256];
- int i, tx, ty, th, len, olen;
+ char buf[1024];
+ int tx, ty, th;
Extnts tex;
+ Colormap cmap;
+ Visual *vis;
+ XftDraw *d;
+ Fnt *curfont, *nextfont;
+ size_t i, len;
+ int utf8strlen, utf8charlen, render;
+ long utf8codepoint = 0;
+ const char *utf8str;
+ FcCharSet *fccharset;
+ FcPattern *fcpattern;
+ FcPattern *match;
+ XftResult result;
+ int charexists = 0;
- if(!drw || !drw->scheme)
- return;
- XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->fg->rgb : drw->scheme->bg->rgb);
- XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
- if(!text || !drw->font)
- return;
- olen = strlen(text);
- drw_font_getexts(drw->font, text, olen, &tex);
- th = drw->font->ascent + drw->font->descent;
- ty = y + (h / 2) - (th / 2) + drw->font->ascent;
- tx = x + (h / 2);
- /* shorten text if necessary */
- for(len = MIN(olen, sizeof buf); len && (tex.w > w - tex.h || w < tex.h); len--)
- drw_font_getexts(drw->font, text, len, &tex);
- if(!len)
- return;
- memcpy(buf, text, len);
- if(len < olen)
- for(i = len; i && i > len - 3; buf[--i] = '.');
- XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->bg->rgb : drw->scheme->fg->rgb);
- if(drw->font->set)
- XmbDrawString(drw->dpy, drw->drawable, drw->font->set, drw->gc, tx, ty, buf, len);
- else
- XDrawString(drw->dpy, drw->drawable, drw->gc, tx, ty, buf, len);
+ if (!(render = x || y || w || h)) {
+ w = ~w;
+ }
+
+ if (!drw || !drw->scheme) {
+ return 0;
+ } else if (render) {
+ XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->fg->pix : drw->scheme->bg->pix);
+ XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
+ }
+
+ if (!text || !drw->fontcount) {
+ return 0;
+ } else if (render) {
+ cmap = DefaultColormap(drw->dpy, drw->screen);
+ vis = DefaultVisual(drw->dpy, drw->screen);
+ d = XftDrawCreate(drw->dpy, drw->drawable, vis, cmap);
+ }
+
+ curfont = drw->fonts[0];
+ while (1) {
+ utf8strlen = 0;
+ utf8str = text;
+ nextfont = NULL;
+ while (*text) {
+ utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
+ for (i = 0; i < drw->fontcount; i++) {
+ charexists = charexists || XftCharExists(drw->dpy, drw->fonts[i]->xfont, utf8codepoint);
+ if (charexists) {
+ if (drw->fonts[i] == curfont) {
+ utf8strlen += utf8charlen;
+ text += utf8charlen;
+ } else {
+ nextfont = drw->fonts[i];
+ }
+ break;
+ }
+ }
+
+ if (!charexists || (nextfont && nextfont != curfont)) {
+ break;
+ } else {
+ charexists = 0;
+ }
+ }
+
+ if (utf8strlen) {
+ drw_font_getexts(curfont, utf8str, utf8strlen, &tex);
+ /* shorten text if necessary */
+ for(len = MIN(utf8strlen, (sizeof buf) - 1); len && (tex.w > w - drw->fonts[0]->h || w < drw->fonts[0]->h); len--)
+ drw_font_getexts(curfont, utf8str, len, &tex);
+
+ if (len) {
+ memcpy(buf, utf8str, len);
+ buf[len] = '\0';
+ if(len < utf8strlen)
+ for(i = len; i && i > len - 3; buf[--i] = '.');
+
+ if (render) {
+ th = curfont->ascent + curfont->descent;
+ ty = y + (h / 2) - (th / 2) + curfont->ascent;
+ tx = x + (h / 2);
+ XftDrawStringUtf8(d, invert ? &drw->scheme->bg->rgb : &drw->scheme->fg->rgb, curfont->xfont, tx, ty, (XftChar8 *)buf, len);
+ }
+
+ x += tex.w;
+ w -= tex.w;
+ }
+ }
+
+ if (!*text) {
+ break;
+ } else if (nextfont) {
+ charexists = 0;
+ curfont = nextfont;
+ } else {
+ /* Regardless of whether or not a fallback font is found, the
+ * character must be drawn.
+ */
+ charexists = 1;
+
+ if (drw->fontcount >= DRW_FONT_CACHE_SIZE) {
+ continue;
+ }
+
+ fccharset = FcCharSetCreate();
+ FcCharSetAddChar(fccharset, utf8codepoint);
+
+ if (!drw->fonts[0]->pattern) {
+ /* Refer to the comment in drw_font_xcreate for more
+ * information.
+ */
+ die("The first font in the cache must be loaded from a font string.\n");
+ }
+
+ fcpattern = FcPatternDuplicate(drw->fonts[0]->pattern);
+ FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
+ FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
+
+ FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
+ FcDefaultSubstitute(fcpattern);
+ match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
+
+ FcCharSetDestroy(fccharset);
+ FcPatternDestroy(fcpattern);
+
+ if (match) {
+ curfont = drw_font_xcreate(drw, NULL, match);
+ if (curfont && XftCharExists(drw->dpy, curfont->xfont, utf8codepoint)) {
+ drw->fonts[drw->fontcount++] = curfont;
+ } else {
+ if (curfont) {
+ drw_font_free(curfont);
+ }
+ curfont = drw->fonts[0];
+ }
+ }
+ }
+ }
+
+ if (render) {
+ XftDrawDestroy(d);
+ }
+
+ return x;
}
void
_AT_@ -182,19 +373,13 @@ drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h) {
void
drw_font_getexts(Fnt *font, const char *text, unsigned int len, Extnts *tex) {
- XRectangle r;
+ XGlyphInfo ext;
if(!font || !text)
return;
- if(font->set) {
- XmbTextExtents(font->set, text, len, NULL, &r);
- tex->w = r.width;
- tex->h = r.height;
- }
- else {
- tex->h = font->ascent + font->descent;
- tex->w = XTextWidth(font->xfont, text, len);
- }
+ XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
+ tex->h = font->h;
+ tex->w = ext.xOff;
}
unsigned int
diff --git a/drw.h b/drw.h
index a5f34e0..536171b 100644
--- a/drw.h
+++ b/drw.h
_AT_@ -1,7 +1,9 @@
/* See LICENSE file for copyright and license details. */
+#define DRW_FONT_CACHE_SIZE 32
typedef struct {
- unsigned long rgb;
+ unsigned long pix;
+ XftColor rgb;
} Clr;
typedef struct {
_AT_@ -9,11 +11,12 @@ typedef struct {
} Cur;
typedef struct {
+ Display *dpy;
int ascent;
int descent;
unsigned int h;
- XFontSet set;
- XFontStruct *xfont;
+ XftFont *xfont;
+ FcPattern *pattern;
} Fnt;
typedef struct {
_AT_@ -30,7 +33,8 @@ typedef struct {
Drawable drawable;
GC gc;
ClrScheme *scheme;
- Fnt *font;
+ size_t fontcount;
+ Fnt *fonts[DRW_FONT_CACHE_SIZE];
} Drw;
typedef struct {
_AT_@ -44,8 +48,9 @@ void drw_resize(Drw *drw, unsigned int w, unsigned int h);
void drw_free(Drw *drw);
/* Fnt abstraction */
-Fnt *drw_font_create(Display *dpy, const char *fontname);
-void drw_font_free(Display *dpy, Fnt *font);
+Fnt *drw_font_create(Drw *drw, const char *fontname);
+void drw_load_fonts(Drw* drw, const char *fonts[], size_t fontcount);
+void drw_font_free(Fnt *font);
void drw_font_getexts(Fnt *font, const char *text, unsigned int len, Extnts *extnts);
unsigned int drw_font_getexts_width(Fnt *font, const char *text, unsigned int len);
_AT_@ -63,7 +68,7 @@ void drw_setscheme(Drw *drw, ClrScheme *scheme);
/* Drawing functions */
void drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int empty, int invert);
-void drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert);
+int drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert);
/* Map functions */
void drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h);
diff --git a/util.h b/util.h
index 033700c..f7ce721 100644
--- a/util.h
+++ b/util.h
_AT_@ -2,5 +2,6 @@
#define MAX(A, B) ((A) > (B) ? (A) : (B))
#define MIN(A, B) ((A) < (B) ? (A) : (B))
+#define BETWEEN(X, A, B) ((A) <= (X) && (X) <= (B))
void die(const char *errstr, ...);
Received on Fri Mar 13 2015 - 21:44:55 CET
This archive was generated by hypermail 2.3.0
: Fri Mar 13 2015 - 21:48:16 CET