draw.c
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/* See LICENSE file for copyright and license details. */
#include <locale.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
#include "draw.h"
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define FG(dc, col) ((col)[(dc)->invert ? ColBG : ColFG])
#define BG(dc, col) ((col)[(dc)->invert ? ColFG : ColBG])
#define DEFFONT "fixed"
static Bool loadfont(DC *dc, const char *fontstr);
void
drawrect(DC *dc, int x, int y, unsigned int w, unsigned int h, Bool fill, unsigned long color) {
XRectangle r = { dc->x + x, dc->y + y, w, h };
if(!fill) {
r.width -= 1;
r.height -= 1;
}
XSetForeground(dc->dpy, dc->gc, color);
(fill ? XFillRectangles : XDrawRectangles)(dc->dpy, dc->canvas, dc->gc, &r, 1);
}
void
drawtext(DC *dc, const char *text, unsigned long col[ColLast]) {
char buf[256];
size_t n, mn;
/* shorten text if necessary */
n = strlen(text);
for(mn = MIN(n, sizeof buf); textnw(dc, text, mn) > dc->w - dc->font.height/2; mn--)
if(mn == 0)
return;
memcpy(buf, text, mn);
if(mn < n)
for(n = MAX(mn-3, 0); n < mn; buf[n++] = '.');
drawrect(dc, 0, 0, dc->w, dc->h, True, BG(dc, col));
drawtextn(dc, buf, mn, col);
}
void
drawtextn(DC *dc, const char *text, size_t n, unsigned long col[ColLast]) {
int x, y;
x = dc->x + dc->font.height/2;
y = dc->y + dc->font.ascent+1;
XSetForeground(dc->dpy, dc->gc, FG(dc, col));
if(dc->font.set)
XmbDrawString(dc->dpy, dc->canvas, dc->font.set, dc->gc, x, y, text, n);
else {
XSetFont(dc->dpy, dc->gc, dc->font.xfont->fid);
XDrawString(dc->dpy, dc->canvas, dc->gc, x, y, text, n);
}
}
void
eprintf(const char *fmt, ...) {
va_list ap;
fprintf(stderr, "%s: ", progname);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
void
freedc(DC *dc) {
if(dc->font.set)
XFreeFontSet(dc->dpy, dc->font.set);
if(dc->font.xfont)
XFreeFont(dc->dpy, dc->font.xfont);
if(dc->canvas)
XFreePixmap(dc->dpy, dc->canvas);
XFreeGC(dc->dpy, dc->gc);
XCloseDisplay(dc->dpy);
free(dc);
}
unsigned long
getcolor(DC *dc, const char *colstr) {
Colormap cmap = DefaultColormap(dc->dpy, DefaultScreen(dc->dpy));
XColor color;
if(!XAllocNamedColor(dc->dpy, cmap, colstr, &color, &color))
eprintf("cannot allocate color '%s'\n", colstr);
return color.pixel;
}
DC *
initdc(void) {
DC *dc;
if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
weprintf("no locale support\n");
if(!(dc = malloc(sizeof *dc)))
eprintf("cannot malloc %u bytes\n", sizeof *dc);
if(!(dc->dpy = XOpenDisplay(NULL)))
eprintf("cannot open display\n");
dc->gc = XCreateGC(dc->dpy, DefaultRootWindow(dc->dpy), 0, NULL);
XSetLineAttributes(dc->dpy, dc->gc, 1, LineSolid, CapButt, JoinMiter);
dc->font.xfont = NULL;
dc->font.set = NULL;
dc->canvas = None;
return dc;
}
void
initfont(DC *dc, const char *fontstr) {
if(!loadfont(dc, fontstr ? fontstr : DEFFONT)) {
if(fontstr != NULL)
weprintf("cannot load font '%s'\n", fontstr);
if(fontstr == NULL || !loadfont(dc, DEFFONT))
eprintf("cannot load font '%s'\n", DEFFONT);
}
dc->font.height = dc->font.ascent + dc->font.descent;
}
Bool
loadfont(DC *dc, const char *fontstr) {
char *def, **missing;
int i, n;
if(!*fontstr)
return False;
if((dc->font.set = XCreateFontSet(dc->dpy, fontstr, &missing, &n, &def))) {
char **names;
XFontStruct **xfonts;
n = XFontsOfFontSet(dc->font.set, &xfonts, &names);
for(i = dc->font.ascent = dc->font.descent = 0; i < n; i++) {
dc->font.ascent = MAX(dc->font.ascent, xfonts[i]->ascent);
dc->font.descent = MAX(dc->font.descent, xfonts[i]->descent);
}
}
else if((dc->font.xfont = XLoadQueryFont(dc->dpy, fontstr))) {
dc->font.ascent = dc->font.xfont->ascent;
dc->font.descent = dc->font.xfont->descent;
}
if(missing)
XFreeStringList(missing);
return (dc->font.set || dc->font.xfont);
}
void
mapdc(DC *dc, Window win, unsigned int w, unsigned int h) {
XCopyArea(dc->dpy, dc->canvas, win, dc->gc, 0, 0, w, h, 0, 0);
}
void
resizedc(DC *dc, unsigned int w, unsigned int h) {
if(dc->canvas)
XFreePixmap(dc->dpy, dc->canvas);
dc->canvas = XCreatePixmap(dc->dpy, DefaultRootWindow(dc->dpy), w, h,
DefaultDepth(dc->dpy, DefaultScreen(dc->dpy)));
dc->x = dc->y = 0;
dc->w = w;
dc->h = h;
dc->invert = False;
}
int
textnw(DC *dc, const char *text, size_t len) {
if(dc->font.set) {
XRectangle r;
XmbTextExtents(dc->font.set, text, len, NULL, &r);
return r.width;
}
return XTextWidth(dc->font.xfont, text, len);
}
int
textw(DC *dc, const char *text) {
return textnw(dc, text, strlen(text)) + dc->font.height;
}
void
weprintf(const char *fmt, ...) {
va_list ap;
fprintf(stderr, "%s: warning: ", progname);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}