diff options
| -rw-r--r-- | draw.c | 176 | ||||
| -rw-r--r-- | draw.h | 35 |
2 files changed, 211 insertions, 0 deletions
@@ -0,0 +1,176 @@ +/* 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 DEFAULTFN "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) { + XSetForeground(dc->dpy, dc->gc, color); + if(fill) + XFillRectangle(dc->dpy, dc->canvas, dc->gc, dc->x + x, dc->y + y, w, h); + else + XDrawRectangle(dc->dpy, dc->canvas, dc->gc, dc->x + x, dc->y + y, w-1, h-1); +} + +void +drawtext(DC *dc, const char *text, unsigned long col[ColLast]) { + char buf[BUFSIZ]; + size_t mn, n = strlen(text); + + /* shorten text if necessary */ + for(mn = MIN(n, sizeof buf); textnw(dc, text, mn) + dc->font.height/2 > dc->w; 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 = dc->x + dc->font.height/2; + int 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; + + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + + if(fmt[0] != '\0' && fmt[strlen(fmt)-1] == ':') { + fputc(' ', stderr); + perror(NULL); + } + 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()) + fprintf(stderr, "no locale support\n"); + if(!(dc = calloc(1, sizeof *dc))) + eprintf("cannot malloc %u bytes:", 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); + return dc; +} + +void +initfont(DC *dc, const char *fontstr) { + if(!loadfont(dc, fontstr ? fontstr : DEFAULTFN)) { + if(fontstr != NULL) + fprintf(stderr, "cannot load font '%s'\n", fontstr); + if(fontstr == NULL || !loadfont(dc, DEFAULTFN)) + eprintf("cannot load font '%s'\n", DEFAULTFN); + } + dc->font.height = dc->font.ascent + dc->font.descent; +} + +Bool +loadfont(DC *dc, const char *fontstr) { + char *def, **missing, **names; + int i, n = 1; + XFontStruct **xfonts; + + if(!*fontstr) + return False; + if((dc->font.set = XCreateFontSet(dc->dpy, fontstr, &missing, &n, &def))) { + n = XFontsOfFontSet(dc->font.set, &xfonts, &names); + } + else { + dc->font.xfont = XLoadQueryFont(dc->dpy, fontstr); + xfonts = &dc->font.xfont; + } + for(i = 0; i < n; i++) { + dc->font.ascent = MAX(dc->font.ascent, xfonts[i]->ascent); + dc->font.descent = MAX(dc->font.descent, xfonts[i]->descent); + dc->font.width = MAX(dc->font.width, xfonts[i]->max_bounds.width); + } + 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->w = w; + dc->h = h; +} + +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; +} @@ -0,0 +1,35 @@ +/* See LICENSE file for copyright and license details. */ + +#define FG(dc, col) ((col)[(dc)->invert ? ColBG : ColFG]) +#define BG(dc, col) ((col)[(dc)->invert ? ColFG : ColBG]) + +enum { ColBG, ColFG, ColBorder, ColLast }; + +typedef struct { + int x, y, w, h; + Bool invert; + Display *dpy; + GC gc; + Pixmap canvas; + struct { + int ascent; + int descent; + int height; + int width; + XFontSet set; + XFontStruct *xfont; + } font; +} DC; /* draw context */ + +void drawrect(DC *dc, int x, int y, unsigned int w, unsigned int h, Bool fill, unsigned long color); +void drawtext(DC *dc, const char *text, unsigned long col[ColLast]); +void drawtextn(DC *dc, const char *text, size_t n, unsigned long col[ColLast]); +void eprintf(const char *fmt, ...); +void freedc(DC *dc); +unsigned long getcolor(DC *dc, const char *colstr); +DC *initdc(void); +void initfont(DC *dc, const char *fontstr); +void mapdc(DC *dc, Window win, unsigned int w, unsigned int h); +void resizedc(DC *dc, unsigned int w, unsigned int h); +int textnw(DC *dc, const char *text, size_t len); +int textw(DC *dc, const char *text); |