added draw.h, draw.c

diff --git a/draw.c b/draw.c
new file mode 100644 (file)
index 0000000..341a26f
--- /dev/null
+++ b/draw.c
@@ -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;
+}

diff --git a/draw.h b/draw.h
new file mode 100644 (file)
index 0000000..43a57bf
--- /dev/null
+++ b/draw.h
@@ -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);