/* See LICENSE file for copyright and license details. */ #include #include #include #include #include #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) 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 = ecalloc(1, sizeof(Drw)); drw->dpy = dpy; drw->screen = screen; drw->root = root; drw->w = w; drw->h = h; drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen)); drw->gc = XCreateGC(dpy, root, 0, NULL); XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter); return drw; } void drw_resize(Drw *drw, unsigned int w, unsigned int h) { if (!drw) return; drw->w = w; drw->h = h; if (drw->drawable) XFreePixmap(drw->dpy, drw->drawable); drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen)); } void drw_free(Drw *drw) { XFreePixmap(drw->dpy, drw->drawable); XFreeGC(drw->dpy, drw->gc); drw_fontset_free(drw->fonts); free(drw); } /* This function is an implementation detail. Library users should use * drw_fontset_create instead. */ static Fnt * xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern) { Fnt *font; XftFont *xfont = NULL; FcPattern *pattern = NULL; if (fontname) { /* Using the pattern found at font->xfont->pattern does not yield 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 (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) { fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname); return NULL; } if (!(pattern = FcNameParse((FcChar8 *) fontname))) { fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname); XftFontClose(drw->dpy, xfont); return NULL; } } else if (fontpattern) { if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) { fprintf(stderr, "error, cannot load font from pattern.\n"); return NULL; } } else { die("no font specified."); } /* Do not allow using color fonts. This is a workaround for a BadLength * error from Xft with color glyphs. Modelled on the Xterm workaround. See * https://bugzilla.redhat.com/show_bug.cgi?id=1498269 * https://lists.suckless.org/dev/1701/30932.html * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916349 * and lots more all over the internet. */ FcBool iscol; if(FcPatternGetBool(xfont->pattern, FC_COLOR, 0, &iscol) == FcResultMatch && iscol) { XftFontClose(drw->dpy, xfont); return NULL; } font = ecalloc(1, sizeof(Fnt)); font->xfont = xfont; font->pattern = pattern; font->h = xfont->ascent + xfont->descent; font->dpy = drw->dpy; return font; } static void xfont_free(Fnt *font) { if (!font) return; if (font->pattern) FcPatternDestroy(font->pattern); XftFontClose(font->dpy, font->xfont); free(font); } Fnt* drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount) { Fnt *cur, *ret = NULL; size_t i; if (!drw || !fonts) return NULL; for (i = 1; i <= fontcount; i++) { if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) { cur->next = ret; ret = cur; } } return (drw->fonts = ret); } void drw_fontset_free(Fnt *font) { if (font) { drw_fontset_free(font->next); xfont_free(font); } } void drw_clr_create(Drw *drw, Clr *dest, const char *clrname) { if (!drw || !dest || !clrname) return; if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen), DefaultColormap(drw->dpy, drw->screen), clrname, dest)) die("error, cannot allocate color '%s'", clrname); } /* Wrapper to create color schemes. The caller has to call free(3) on the * returned color scheme when done using it. */ Clr * drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount) { size_t i; Clr *ret; /* need at least two colors for a scheme */ if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor)))) return NULL; for (i = 0; i < clrcount; i++) drw_clr_create(drw, &ret[i], clrnames[i]); return ret; } void drw_setfontset(Drw *drw, Fnt *set) { if (drw) drw->fonts = set; } void drw_setscheme(Drw *drw, Clr *scm) { if (drw) drw->scheme = scm; } void drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert) { if (!drw || !drw->scheme) return; XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel); if (filled) XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h); else XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1); } int drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert) { char buf[1024]; int ty; unsigned int ew=0; XftDraw *d = NULL; Fnt *usedfont, *curfont, *nextfont; size_t i, len; int utf8strlen, utf8charlen, render = x || y || w || h; long utf8codepoint = 0; const char *utf8str; FcCharSet *fccharset; FcPattern *fcpattern; FcPattern *match; XftResult result; int charexists = 0; if (!drw || (render && !drw->scheme) || !text || !drw->fonts) return 0; if (!render) { w = ~w; } else { XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel); XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h); d = XftDrawCreate(drw->dpy, drw->drawable, DefaultVisual(drw->dpy, drw->screen), DefaultColormap(drw->dpy, drw->screen)); x += lpad; w -= lpad; } usedfont = drw->fonts; while (1) { utf8strlen = 0; utf8str = text; nextfont = NULL; while (*text) { utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ); for (curfont = drw->fonts; curfont; curfont = curfont->next) { charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint); if (charexists) { if (curfont == usedfont) { utf8strlen += utf8charlen; text += utf8charlen; } else { nextfont = curfont; } break; } } if (!charexists || nextfont) break; else charexists = 0; } if (utf8strlen) { drw_font_getexts(usedfont, utf8str, utf8strlen, &ew, NULL); /* shorten text if necessary */ for (len = MIN(utf8strlen, sizeof(buf) - 1); len && ew > w; len--) drw_font_getexts(usedfont, utf8str, len, &ew, NULL); if (len) { memcpy(buf, utf8str, len); buf[len] = '\0'; if (len < utf8strlen) for (i = len; i && i > len - 3; buf[--i] = '.') ; /* NOP */ if (render) { ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent; XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg], usedfont->xfont, x, ty, (XftChar8 *)buf, len); } x += ew; w -= ew; } } if (!*text) { break; } else if (nextfont) { charexists = 0; usedfont = nextfont; } else { /* Regardless of whether or not a fallback font is found, the * character must be drawn. */ charexists = 1; fccharset = FcCharSetCreate(); FcCharSetAddChar(fccharset, utf8codepoint); if (!drw->fonts->pattern) { /* Refer to the comment in xfont_create for more information. */ die("the first font in the cache must be loaded from a font string."); } fcpattern = FcPatternDuplicate(drw->fonts->pattern); FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset); FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue); FcPatternAddBool(fcpattern, FC_COLOR, FcFalse); FcConfigSubstitute(NULL, fcpattern, FcMatchPattern); FcDefaultSubstitute(fcpattern); match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result); FcCharSetDestroy(fccharset); FcPatternDestroy(fcpattern); if (match) { usedfont = xfont_create(drw, NULL, match); if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) { for (curfont = drw->fonts; curfont->next; curfont = curfont->next) ; /* NOP */ curfont->next = usedfont; } else { xfont_free(usedfont); usedfont = drw->fonts; } } } } if (d) XftDrawDestroy(d); return x + (render ? w : 0); } void drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h) { if (!drw) return; XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y); XSync(drw->dpy, False); } unsigned int drw_fontset_getwidth(Drw *drw, const char *text) { if (!drw || !drw->fonts || !text) return 0; return drw_text(drw, 0, 0, 0, 0, 0, text, 0); } void drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h) { XGlyphInfo ext; if (!font || !text) return; XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext); if (w) *w = ext.xOff; if (h) *h = font->h; } Cur * drw_cur_create(Drw *drw, int shape) { Cur *cur; if (!drw || !(cur = ecalloc(1, sizeof(Cur)))) return NULL; cur->cursor = XCreateFontCursor(drw->dpy, shape); return cur; } void drw_cur_free(Drw *drw, Cur *cursor) { if (!cursor) return; XFreeCursor(drw->dpy, cursor->cursor); free(cursor); }