slock

commit f1ca0d9cdd06f30739d96ee4c554ab4ef708e8ea
parent 6f76e0a9275e2ff3e101e9bf56627024b0174fe0
Author: Matthew Carlson <matt@mcarlson.xyz>
Date:   Fri, 16 Jul 2021 03:20:57 -0400

xft

Diffstat:
M
config.h
 | 
9
+++++++++
M
config.mk
 | 
4
++--
M
slock.c
 | 
108
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---

3 files changed, 116 insertions(+), 5 deletions(-)
diff --git a/config.h b/config.h
@@ -10,3 +10,12 @@ static const char *colorname[NUMCOLS] = {
 
 /* treat a cleared input like a wrong password (color) */
 static const int failonclear = 1;
+
+/* default message */
+static const char * message = "Suckless: Software that sucks less.";
+
+/* text color */
+static const char * text_color = "#ffffff";
+
+/* text size (must be a valid size) */
+static const char * font_name = "sans-serif:size:pixelsize=24:antialias=true:autohint=true";
diff --git a/config.mk b/config.mk
@@ -11,8 +11,8 @@ X11INC = /usr/X11R6/include
 X11LIB = /usr/X11R6/lib
 
 # includes and libs
-INCS = -I. -I/usr/include -I${X11INC}
-LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr
+INCS = -I. -I/usr/include -I${X11INC} -I/usr/include/freetype2
+LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr -lXinerama -lXft
 
 # flags
 CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE -DHAVE_SHADOW_H
diff --git a/slock.c b/slock.c
@@ -14,16 +14,22 @@
 #include <string.h>
 #include <unistd.h>
 #include <sys/types.h>
+#include <fontconfig/fontconfig.h>
 #include <X11/extensions/Xrandr.h>
+#include <X11/extensions/Xinerama.h>
 #include <X11/keysym.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
+#include <X11/Xft/Xft.h>
 
 #include "arg.h"
 #include "util.h"
 
 char *argv0;
 
+/* global count to prevent repeated error messages */
+int count_error = 0;
+
 enum {
 	INIT,
 	INPUT,
@@ -83,6 +89,96 @@ dontkillme(void)
 }
 #endif
 
+static void
+writemessage(Display *dpy, Window win, int screen)
+{
+    int len, line_len, width, height, s_width, s_height, i, j, k, tab_replace, tab_size;
+    XftFont *fontinfo;
+    XftColor xftcolor;
+    XftDraw *xftdraw;
+    XGlyphInfo ext_msg, ext_space;
+    XineramaScreenInfo *xsi;
+    xftdraw = XftDrawCreate(dpy, win, DefaultVisual(dpy, screen), DefaultColormap(dpy, screen));
+    fontinfo = XftFontOpenName(dpy, screen, font_name);
+    XftColorAllocName(dpy, DefaultVisual(dpy, screen), DefaultColormap(dpy, screen), text_color, &xftcolor);
+
+    if (fontinfo == NULL) {
+        if (count_error == 0) {
+            fprintf(stderr, "slock: Unable to load font \"%s\"\n", font_name);
+            count_error++;
+        }
+        return;
+    }
+
+    XftTextExtentsUtf8(dpy, fontinfo, (XftChar8 *) " ", 1, &ext_space);
+    tab_size = 8 * ext_space.width;
+
+    /*  To prevent "Uninitialized" warnings. */
+    xsi = NULL;
+
+    /*
+     * Start formatting and drawing text
+     */
+
+    len = strlen(message);
+
+    /* Max max line length (cut at '\n') */
+    line_len = 0;
+    k = 0;
+    for (i = j = 0; i < len; i++) {
+        if (message[i] == '\n') {
+            if (i - j > line_len)
+                line_len = i - j;
+            k++;
+            i++;
+            j = i;
+        }
+    }
+    /* If there is only one line */
+    if (line_len == 0)
+        line_len = len;
+
+    if (XineramaIsActive(dpy)) {
+        xsi = XineramaQueryScreens(dpy, &i);
+        s_width = xsi[0].width;
+        s_height = xsi[0].height;
+    } else {
+        s_width = DisplayWidth(dpy, screen);
+        s_height = DisplayHeight(dpy, screen);
+    }
+
+    XftTextExtentsUtf8(dpy, fontinfo, (XftChar8 *)message, line_len, &ext_msg);
+    height = s_height*3/7 - (k*20)/3;
+    width  = (s_width - ext_msg.width)/2;
+
+    /* Look for '\n' and print the text between them. */
+    for (i = j = k = 0; i <= len; i++) {
+        /* i == len is the special case for the last line */
+        if (i == len || message[i] == '\n') {
+            tab_replace = 0;
+            while (message[j] == '\t' && j < i) {
+                tab_replace++;
+                j++;
+            }
+
+            XftDrawStringUtf8(xftdraw, &xftcolor, fontinfo, width + tab_size*tab_replace, height + 20*k, (XftChar8 *)(message + j), i - j);
+            while (i < len && message[i] == '\n') {
+                i++;
+                j = i;
+                k++;
+            }
+        }
+    }
+
+    /* xsi should not be NULL anyway if Xinerama is active, but to be safe */
+    if (XineramaIsActive(dpy) && xsi != NULL)
+        XFree(xsi);
+
+    XftFontClose(dpy, fontinfo);
+    XftColorFree(dpy, DefaultVisual(dpy, screen), DefaultColormap(dpy, screen), &xftcolor);
+    XftDrawDestroy(xftdraw);
+}
+
 static const char *
 gethash(void)
 {
@@ -194,6 +290,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
 					                     locks[screen]->win,
 					                     locks[screen]->colors[color]);
 					XClearWindow(dpy, locks[screen]->win);
+                    writemessage(dpy, locks[screen]->win, screen);
 				}
 				oldc = color;
 			}
@@ -300,7 +397,7 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
 static void
 usage(void)
 {
-	die("usage: slock [-v] [cmd [arg ...]]\n");
+    die("usage: slock [-v] [-m message] [cmd [arg ...]]\n");
 }
 
 int
@@ -319,6 +416,9 @@ main(int argc, char **argv) {
 	case 'v':
 		fprintf(stderr, "slock-"VERSION"\n");
 		return 0;
+    case 'm':
+        message = EARGF(usage());
+        break;
 	default:
 		usage();
 	} ARGEND
@@ -363,10 +463,12 @@ main(int argc, char **argv) {
 	if (!(locks = calloc(nscreens, sizeof(struct lock *))))
 		die("slock: out of memory\n");
 	for (nlocks = 0, s = 0; s < nscreens; s++) {
-		if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL)
+        if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL) {
+            writemessage(dpy, locks[s]->win, s);
 			nlocks++;
-		else
+        } else {
 			break;
+        }
 	}
 	XSync(dpy, 0);