added textwidth gadget

git-svn-id: http://dzen.googlecode.com/svn/trunk@139 f2baff5b-bf2c-0410-a398-912abdc3d8b2

1 files changed, 117 insertions, 0 deletions

diff --git a/gadgets/textwidth.c b/gadgets/textwidth.c
new file mode 100644
index 0000000..e32cb1e
--- /dev/null
+++ b/gadgets/textwidth.c
@@ -0,0 +1,117 @@
+/*
+    textwidth - calculate width in pixels of text with a given font
+
+    Copyright (C) 2007 by Robert Manea  <rob dot manea at gmail dot com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+
+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+#include<X11/Xlib.h>
+
+typedef struct _Fnt {
+	XFontStruct *xfont;
+	XFontSet set;
+	int ascent;
+	int descent;
+	int height;
+} Fnt;
+
+Fnt font;
+Display *dpy;
+
+static unsigned int
+textw(const char *text, unsigned int len) {
+	XRectangle r;
+
+	if(font.set) {
+		XmbTextExtents(font.set, text, len, NULL, &r);
+		return r.width;
+	}
+	return XTextWidth(font.xfont, text, len);
+}
+
+void
+setfont(const char *fontstr) {
+	char *def, **missing;
+	int i, n;
+
+	missing = NULL;
+	if(font.set)
+		XFreeFontSet(dpy, font.set);
+	font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
+	if(missing)
+		XFreeStringList(missing);
+	if(font.set) {
+		XFontSetExtents *font_extents;
+		XFontStruct **xfonts;
+		char **font_names;
+		font.ascent = font.descent = 0;
+		font_extents = XExtentsOfFontSet(font.set);
+		n = XFontsOfFontSet(font.set, &xfonts, &font_names);
+		for(i = 0, font.ascent = 0, font.descent = 0; i < n; i++) {
+			if(font.ascent < (*xfonts)->ascent)
+				font.ascent = (*xfonts)->ascent;
+			if(font.descent < (*xfonts)->descent)
+				font.descent = (*xfonts)->descent;
+			xfonts++;
+		}
+	}
+	else {
+		if(font.xfont)
+			XFreeFont(dpy, font.xfont);
+		font.xfont = NULL;
+		if(!(font.xfont = XLoadQueryFont(dpy, fontstr))) {
+			fprintf(stderr, "error, cannot load font: '%s'\n", fontstr);
+			exit(EXIT_FAILURE);
+		}
+		font.ascent = font.xfont->ascent;
+		font.descent = font.xfont->descent;
+	}
+	font.height = font.ascent + font.descent;
+}
+
+int
+main(int argc, char *argv[])
+{
+	char *myfont, *text;
+
+	if(argc < 3) {
+		fprintf(stderr, "usage: %s <font> <string>\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	myfont = argv[1];
+	text   = argv[2];
+
+	dpy = XOpenDisplay(0);
+	if(!dpy) {
+		fprintf(stderr, "cannot open display\n");
+		return EXIT_FAILURE;
+	}
+
+	setfont(myfont);
+	printf("%d\n", textw(text, strlen(text)));
+
+	return EXIT_SUCCESS;
+}
+