10 files changed, 212 insertions, 0 deletions

diff --git a/draw/Makefile b/draw/Makefile
new file mode 100644
index 0000000..1f72b61
--- /dev/null
+++ b/draw/Makefile
@@ -0,0 +1,26 @@
+# libdraw - dynamic drawing library
+# See LICENSE file for copyright and license details.
+
+include ../config.mk
+
+SRC = cleanupdraw.c setupdraw.c drawtext.c eprint.c getcolor.c initfont.c \
+textnw.c textw.c
+OBJ = ${SRC:.c=.o}
+
+all: libdraw.a
+
+.c.o:
+        @echo CC $<
+        @${CC} -c ${CFLAGS} $<
+
+${OBJ}: ../config.mk draw.h
+
+libdraw.a: ${OBJ}
+        @echo AR $@
+        @ar cr $@ $+
+
+clean:
+        @echo cleaning libdraw
+        @rm -f libdraw.a ${OBJ}
+
+.PHONY: all options clean
diff --git a/draw/cleanupdraw.c b/draw/cleanupdraw.c
new file mode 100644
index 0000000..28bce13
--- /dev/null
+++ b/draw/cleanupdraw.c
@@ -0,0 +1,13 @@
+/* See LICENSE file for copyright and license details. */
+#include <X11/Xlib.h>
+#include "draw.h"
+
+void
+cleanupdraw(DC *dc) {
+        if(dc->font.set)
+                XFreeFontSet(dc->dpy, dc->font.set);
+        else
+                XFreeFont(dc->dpy, dc->font.xfont);
+        XFreePixmap(dc->dpy, dc->drawable);
+        XFreeGC(dc->dpy, dc->gc);
+}
diff --git a/draw/draw.h b/draw/draw.h
new file mode 100644
index 0000000..4646a18
--- /dev/null
+++ b/draw/draw.h
@@ -0,0 +1,33 @@
+/* See LICENSE file for copyright and license details. */
+#include <X11/Xlib.h>
+
+/* enums */
+enum { ColFG, ColBG, ColLast };
+
+/* typedefs */
+typedef struct {
+        int x, y, w, h;
+        Drawable drawable;
+        Display *dpy;
+        GC gc;
+        struct {
+                XFontStruct *xfont;
+                XFontSet set;
+                int ascent;
+                int descent;
+                int height;
+        } font;
+} DC; /* draw context */
+
+/* forward declarations */
+void cleanupdraw(DC *dc);
+void drawtext(DC *dc, const char *text, unsigned long col[ColLast]);
+void eprint(const char *fmt, ...);
+unsigned long getcolor(DC *dc, const char *colstr);
+void initfont(DC *dc, const char *fontstr);
+void setupdraw(DC *dc, Window w);
+int textnw(DC *dc, const char *text, unsigned int len);
+int textw(DC *dc, const char *text);
+
+/* variables */
+extern const char *progname;
diff --git a/draw/drawtext.c b/draw/drawtext.c
new file mode 100644
index 0000000..cf7b015
--- /dev/null
+++ b/draw/drawtext.c
@@ -0,0 +1,34 @@
+/* See LICENSE file for copyright and license details. */
+#include <string.h>
+#include <X11/Xlib.h>
+#include "draw.h"
+
+#define MIN(a, b)               ((a) < (b) ? (a) : (b))
+
+void
+drawtext(DC *dc, const char *text, unsigned long col[ColLast]) {
+        char buf[256];
+        int i, x, y, h, len, olen;
+        XRectangle r = { dc->x, dc->y, dc->w, dc->h };
+
+        XSetForeground(dc->dpy, dc->gc, col[ColBG]);
+        XFillRectangles(dc->dpy, dc->drawable, dc->gc, &r, 1);
+        if(!text)
+                return;
+        olen = strlen(text);
+        h = dc->font.height;
+        y = dc->y + ((h+2) / 2) - (h / 2) + dc->font.ascent;
+        x = dc->x + (h / 2);
+        /* shorten text if necessary */
+        for(len = MIN(olen, sizeof buf); len && textnw(dc, text, len) > dc->w - h; len--);
+        if(!len)
+                return;
+        memcpy(buf, text, len);
+        if(len < olen)
+                for(i = len; i && i > len - 3; buf[--i] = '.');
+        XSetForeground(dc->dpy, dc->gc, col[ColFG]);
+        if(dc->font.set)
+                XmbDrawString(dc->dpy, dc->drawable, dc->font.set, dc->gc, x, y, buf, len);
+        else
+                XDrawString(dc->dpy, dc->drawable, dc->gc, x, y, buf, len);
+}
diff --git a/draw/eprint.c b/draw/eprint.c
new file mode 100644
index 0000000..3094b61
--- /dev/null
+++ b/draw/eprint.c
@@ -0,0 +1,18 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "draw.h"
+
+const char *progname;
+
+void
+eprint(const char *fmt, ...) {
+        va_list ap;
+
+        fprintf(stderr, "%s: ", progname);
+        va_start(ap, fmt);
+        vfprintf(stderr, fmt, ap);
+        va_end(ap);
+        exit(EXIT_FAILURE);
+}
diff --git a/draw/getcolor.c b/draw/getcolor.c
new file mode 100644
index 0000000..c0e5d21
--- /dev/null
+++ b/draw/getcolor.c
@@ -0,0 +1,13 @@
+/* See LICENSE file for copyright and license details. */
+#include <X11/Xlib.h>
+#include "draw.h"
+
+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))
+                eprint("cannot allocate color '%s'\n", colstr);
+        return color.pixel;
+}
diff --git a/draw/initfont.c b/draw/initfont.c
new file mode 100644
index 0000000..77d3182
--- /dev/null
+++ b/draw/initfont.c
@@ -0,0 +1,36 @@
+/* See LICENSE file for copyright and license details. */
+#include <X11/Xlib.h>
+#include "draw.h"
+
+#define MAX(a, b)               ((a) > (b) ? (a) : (b))
+
+void
+initfont(DC *dc, const char *fontstr) {
+        char *def, **missing = NULL;
+        int i, n;
+
+        if(!fontstr || !*fontstr)
+                eprint("cannot load null font\n");
+        dc->font.set = XCreateFontSet(dc->dpy, fontstr, &missing, &n, &def);
+        if(missing)
+                XFreeStringList(missing);
+        if(dc->font.set) {
+                XFontStruct **xfonts;
+                char **font_names;
+                dc->font.ascent = dc->font.descent = 0;
+                n = XFontsOfFontSet(dc->font.set, &xfonts, &font_names);
+                for(i = 0; i < n; i++) {
+                        dc->font.ascent = MAX(dc->font.ascent, (*xfonts)->ascent);
+                        dc->font.descent = MAX(dc->font.descent, (*xfonts)->descent);
+                        xfonts++;
+                }
+        }
+        else {
+                if(!(dc->font.xfont = XLoadQueryFont(dc->dpy, fontstr))
+                && !(dc->font.xfont = XLoadQueryFont(dc->dpy, "fixed")))
+                        eprint("cannot load font '%s'\n", fontstr);
+                dc->font.ascent = dc->font.xfont->ascent;
+                dc->font.descent = dc->font.xfont->descent;
+        }
+        dc->font.height = dc->font.ascent + dc->font.descent;
+}
diff --git a/draw/setupdraw.c b/draw/setupdraw.c
new file mode 100644
index 0000000..7dd5012
--- /dev/null
+++ b/draw/setupdraw.c
@@ -0,0 +1,16 @@
+/* See LICENSE file for copyright and license details. */
+#include <X11/Xlib.h>
+#include "draw.h"
+
+void
+setupdraw(DC *dc, Window w) {
+        XWindowAttributes wa;
+
+        XGetWindowAttributes(dc->dpy, w, &wa);
+        dc->drawable = XCreatePixmap(dc->dpy, w, wa.width, wa.height,
+                DefaultDepth(dc->dpy, DefaultScreen(dc->dpy)));
+        dc->gc = XCreateGC(dc->dpy, w, 0, NULL);
+        XSetLineAttributes(dc->dpy, dc->gc, 1, LineSolid, CapButt, JoinMiter);
+        if(!dc->font.set)
+                XSetFont(dc->dpy, dc->gc, dc->font.xfont->fid);
+}
diff --git a/draw/textnw.c b/draw/textnw.c
new file mode 100644
index 0000000..9c0c122
--- /dev/null
+++ b/draw/textnw.c
@@ -0,0 +1,14 @@
+/* See LICENSE file for copyright and license details. */
+#include <X11/Xlib.h>
+#include "draw.h"
+
+int
+textnw(DC *dc, const char *text, unsigned int len) {
+        XRectangle r;
+
+        if(dc->font.set) {
+                XmbTextExtents(dc->font.set, text, len, NULL, &r);
+                return r.width;
+        }
+        return XTextWidth(dc->font.xfont, text, len);
+}
diff --git a/draw/textw.c b/draw/textw.c
new file mode 100644
index 0000000..a8407f6
--- /dev/null
+++ b/draw/textw.c
@@ -0,0 +1,9 @@
+/* See LICENSE file for copyright and license details. */
+#include <string.h>
+#include <X11/Xlib.h>
+#include "draw.h"
+
+int
+textw(DC *dc, const char *text) {
+        return textnw(dc, text, strlen(text)) + dc->font.height;
+}