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452 lines
11 KiB
C
452 lines
11 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <X11/Xlib.h>
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#include <X11/Xft/Xft.h>
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#include "drw.h"
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#include "util.h"
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#define UTF_INVALID 0xFFFD
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#define UTF_SIZ 4
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static const unsigned char utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
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static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
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static const long utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};
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static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
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static long
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utf8decodebyte(const char c, size_t *i)
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{
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for (*i = 0; *i < (UTF_SIZ + 1); ++(*i))
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if (((unsigned char)c & utfmask[*i]) == utfbyte[*i])
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return (unsigned char)c & ~utfmask[*i];
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return 0;
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}
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static size_t
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utf8validate(long *u, size_t i)
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{
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if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
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*u = UTF_INVALID;
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for (i = 1; *u > utfmax[i]; ++i)
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;
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return i;
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}
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static size_t
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utf8decode(const char *c, long *u, size_t clen)
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{
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size_t i, j, len, type;
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long udecoded;
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*u = UTF_INVALID;
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if (!clen)
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return 0;
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udecoded = utf8decodebyte(c[0], &len);
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if (!BETWEEN(len, 1, UTF_SIZ))
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return 1;
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for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
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udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
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if (type)
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return j;
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}
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if (j < len)
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return 0;
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*u = udecoded;
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utf8validate(u, len);
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return len;
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}
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Drw *
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drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h)
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{
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Drw *drw = ecalloc(1, sizeof(Drw));
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drw->dpy = dpy;
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drw->screen = screen;
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drw->root = root;
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drw->w = w;
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drw->h = h;
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drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
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drw->gc = XCreateGC(dpy, root, 0, NULL);
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XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
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return drw;
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}
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void
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drw_resize(Drw *drw, unsigned int w, unsigned int h)
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{
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if (!drw)
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return;
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drw->w = w;
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drw->h = h;
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if (drw->drawable)
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XFreePixmap(drw->dpy, drw->drawable);
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drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
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}
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void
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drw_free(Drw *drw)
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{
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XFreePixmap(drw->dpy, drw->drawable);
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XFreeGC(drw->dpy, drw->gc);
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drw_fontset_free(drw->fonts);
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free(drw);
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}
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/* This function is an implementation detail. Library users should use
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* drw_fontset_create instead.
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*/
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static Fnt *
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xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
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{
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Fnt *font;
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XftFont *xfont = NULL;
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FcPattern *pattern = NULL;
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if (fontname) {
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/* Using the pattern found at font->xfont->pattern does not yield the
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* same substitution results as using the pattern returned by
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* FcNameParse; using the latter results in the desired fallback
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* behaviour whereas the former just results in missing-character
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* rectangles being drawn, at least with some fonts. */
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if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
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fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
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return NULL;
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}
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if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
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fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
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XftFontClose(drw->dpy, xfont);
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return NULL;
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}
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} else if (fontpattern) {
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if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
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fprintf(stderr, "error, cannot load font from pattern.\n");
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return NULL;
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}
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} else {
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die("no font specified.");
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}
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font = ecalloc(1, sizeof(Fnt));
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font->xfont = xfont;
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font->pattern = pattern;
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font->h = xfont->ascent + xfont->descent;
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font->dpy = drw->dpy;
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return font;
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}
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static void
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xfont_free(Fnt *font)
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{
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if (!font)
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return;
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if (font->pattern)
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FcPatternDestroy(font->pattern);
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XftFontClose(font->dpy, font->xfont);
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free(font);
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}
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Fnt*
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drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
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{
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Fnt *cur, *ret = NULL;
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size_t i;
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if (!drw || !fonts)
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return NULL;
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for (i = 1; i <= fontcount; i++) {
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if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
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cur->next = ret;
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ret = cur;
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}
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}
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return (drw->fonts = ret);
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}
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void
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drw_fontset_free(Fnt *font)
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{
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if (font) {
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drw_fontset_free(font->next);
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xfont_free(font);
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}
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}
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void
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drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
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{
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if (!drw || !dest || !clrname)
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return;
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if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
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DefaultColormap(drw->dpy, drw->screen),
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clrname, dest))
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die("error, cannot allocate color '%s'", clrname);
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}
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/* Wrapper to create color schemes. The caller has to call free(3) on the
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* returned color scheme when done using it. */
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Clr *
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drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
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{
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size_t i;
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Clr *ret;
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/* need at least two colors for a scheme */
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if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
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return NULL;
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for (i = 0; i < clrcount; i++)
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drw_clr_create(drw, &ret[i], clrnames[i]);
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return ret;
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}
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void
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drw_setfontset(Drw *drw, Fnt *set)
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{
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if (drw)
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drw->fonts = set;
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}
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void
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drw_setscheme(Drw *drw, Clr *scm)
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{
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if (drw)
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drw->scheme = scm;
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}
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void
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drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
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{
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if (!drw || !drw->scheme)
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return;
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XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
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if (filled)
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XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
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else
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XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
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}
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int
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drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
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{
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int ty, ellipsis_x = 0;
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unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len, hash, h0, h1;
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XftDraw *d = NULL;
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Fnt *usedfont, *curfont, *nextfont;
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int utf8strlen, utf8charlen, render = x || y || w || h;
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long utf8codepoint = 0;
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const char *utf8str;
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FcCharSet *fccharset;
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FcPattern *fcpattern;
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FcPattern *match;
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XftResult result;
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int charexists = 0, overflow = 0;
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/* keep track of a couple codepoints for which we have no match. */
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static unsigned int nomatches[128], ellipsis_width;
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if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
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return 0;
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if (!render) {
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w = invert ? invert : ~invert;
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} else {
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XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
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XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
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d = XftDrawCreate(drw->dpy, drw->drawable,
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DefaultVisual(drw->dpy, drw->screen),
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DefaultColormap(drw->dpy, drw->screen));
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x += lpad;
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w -= lpad;
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}
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usedfont = drw->fonts;
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if (!ellipsis_width && render)
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ellipsis_width = drw_fontset_getwidth(drw, "...");
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while (1) {
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ew = ellipsis_len = utf8strlen = 0;
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utf8str = text;
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nextfont = NULL;
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while (*text) {
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utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
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for (curfont = drw->fonts; curfont; curfont = curfont->next) {
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charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
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if (charexists) {
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drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);
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if (ew + ellipsis_width <= w) {
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/* keep track where the ellipsis still fits */
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ellipsis_x = x + ew;
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ellipsis_w = w - ew;
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ellipsis_len = utf8strlen;
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}
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if (ew + tmpw > w) {
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overflow = 1;
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/* called from drw_fontset_getwidth_clamp():
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* it wants the width AFTER the overflow
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*/
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if (!render)
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x += tmpw;
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else
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utf8strlen = ellipsis_len;
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} else if (curfont == usedfont) {
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utf8strlen += utf8charlen;
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text += utf8charlen;
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ew += tmpw;
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} else {
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nextfont = curfont;
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}
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break;
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}
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}
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if (overflow || !charexists || nextfont)
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break;
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else
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charexists = 0;
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}
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if (utf8strlen) {
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if (render) {
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ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
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XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
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usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);
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}
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x += ew;
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w -= ew;
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}
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if (render && overflow)
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drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
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if (!*text || overflow) {
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break;
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} else if (nextfont) {
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charexists = 0;
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usedfont = nextfont;
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} else {
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/* Regardless of whether or not a fallback font is found, the
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* character must be drawn. */
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charexists = 1;
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hash = (unsigned int)utf8codepoint;
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hash = ((hash >> 16) ^ hash) * 0x21F0AAAD;
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hash = ((hash >> 15) ^ hash) * 0xD35A2D97;
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h0 = ((hash >> 15) ^ hash) % LENGTH(nomatches);
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h1 = (hash >> 17) % LENGTH(nomatches);
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/* avoid expensive XftFontMatch call when we know we won't find a match */
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if (nomatches[h0] == utf8codepoint || nomatches[h1] == utf8codepoint)
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goto no_match;
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fccharset = FcCharSetCreate();
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FcCharSetAddChar(fccharset, utf8codepoint);
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if (!drw->fonts->pattern) {
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/* Refer to the comment in xfont_create for more information. */
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die("the first font in the cache must be loaded from a font string.");
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}
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fcpattern = FcPatternDuplicate(drw->fonts->pattern);
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FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
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FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
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FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
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FcDefaultSubstitute(fcpattern);
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match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
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FcCharSetDestroy(fccharset);
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FcPatternDestroy(fcpattern);
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if (match) {
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usedfont = xfont_create(drw, NULL, match);
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if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
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for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
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; /* NOP */
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curfont->next = usedfont;
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} else {
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xfont_free(usedfont);
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nomatches[nomatches[h0] ? h1 : h0] = utf8codepoint;
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no_match:
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usedfont = drw->fonts;
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}
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}
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}
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}
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if (d)
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XftDrawDestroy(d);
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return x + (render ? w : 0);
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}
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void
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drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
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{
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if (!drw)
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return;
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XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
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XSync(drw->dpy, False);
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}
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unsigned int
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drw_fontset_getwidth(Drw *drw, const char *text)
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{
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if (!drw || !drw->fonts || !text)
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return 0;
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return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
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}
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unsigned int
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drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n)
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{
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unsigned int tmp = 0;
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if (drw && drw->fonts && text && n)
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tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
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return MIN(n, tmp);
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}
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void
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drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
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{
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XGlyphInfo ext;
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if (!font || !text)
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return;
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XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
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if (w)
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*w = ext.xOff;
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if (h)
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*h = font->h;
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}
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Cur *
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drw_cur_create(Drw *drw, int shape)
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{
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Cur *cur;
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if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
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return NULL;
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cur->cursor = XCreateFontCursor(drw->dpy, shape);
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return cur;
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}
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void
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drw_cur_free(Drw *drw, Cur *cursor)
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{
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if (!cursor)
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return;
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XFreeCursor(drw->dpy, cursor->cursor);
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free(cursor);
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}
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