[hackers] [dwm] added draw.h, draw.c || Connor Lane Smith

changeset: 1542:bbef129b96c2
tag: tip
user: Connor Lane Smith <cls_AT_lubutu.com>
date: Fri May 20 19:10:26 2011 +0100
files: draw.c draw.h
description:
added draw.h, draw.c

diff -r 1aa4689c9d2c -r bbef129b96c2 draw.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/draw.c Fri May 20 19:10:26 2011 +0100
@@ -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 -r 1aa4689c9d2c -r bbef129b96c2 draw.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/draw.h Fri May 20 19:10:26 2011 +0100
@@ -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);
Received on Fri May 20 2011 - 20:10:50 CEST