From 36b5421299224183d111685c1c11f43fb0486f37 Mon Sep 17 00:00:00 2001
From: reinelt <>
Date: Tue, 28 Mar 2000 08:48:33 +0000
Subject: [lcd4linux @ 2000-03-28 08:48:33 by reinelt] README.X11 added

---
 README.X11 | 45 +++++++++++++++++++++++++++++++++++++++++++++
 XWindow.c  | 18 +++++++++++-------
 2 files changed, 56 insertions(+), 7 deletions(-)
 create mode 100644 README.X11

diff --git a/README.X11 b/README.X11
new file mode 100644
index 0000000..0df71a7
--- /dev/null
+++ b/README.X11
@@ -0,0 +1,45 @@
+#
+# $Id: README.X11,v 1.1 2000/03/28 08:48:33 reinelt Exp $
+#
+
+This is the README file for the X11 display driver for lcd4linux
+
+The driver opens a X11 window based on the geometry specified in the
+config file. This window cannot be resized. The contents of the window
+will be redrawn every 'tick' msec.
+
+The driver uses very low cpu time, and requires low bandwitdh, because 
+only modified pixels are redrawn.
+
+
+Configuration:
+
+The driver needs/supports the following entries in lcd4linux.conf:
+
+Display: must be "X11"
+size: [columns]x[rows], e.g. "20x4"
+font: [xrex]x[yres], at the moment only "5x8" and "6x8" supported.
+pixel: [pixelsize]+[pixelgap], e.g. "5+1"
+gap: [row gap]x[column gap], e.g. "3x3"
+border: border width
+foreground: color of an active LCD Pixel, must be #rrggbb
+halfground: color of an inactive LCD Pixel, must be #rrggbb
+background: backlight color, must be #rrggbb
+
+This may look weird, but it is weird. Let's explain this a bit further:
+The X11 driver tries to emulate a real LC display. A real LCD has a
+size of columns*rows characters. Each character consists of xres*yres 
+LCD cells. One single cell will be represented by a rectangle of
+pixelsize*pixelsize pixels. If you want to, you can emulate the gap 
+between this lcd cells by specifying a pixelgap greater than zero.
+Sometimes there's a gap between characters, too. You can specify this 
+gap (in pixels again) horizontally and vertically. Usually this gap
+is the same size as a cell (which is pixelsize+pixelgap). 
+
+If you use a font of 5x8, some characters may use the first and the last 
+pixel. So you should specify a column gap, otherwise the caracters may 
+touch. On the other hand, the 6x8 font never uses the first pixel. So you 
+can omit the column gap, and will get the same text layout, but 
+uninterupted bars!
+
+After all: don't try to understand this unless you have tried it out!
diff --git a/XWindow.c b/XWindow.c
index ab86857..1b6b5d6 100644
--- a/XWindow.c
+++ b/XWindow.c
@@ -1,4 +1,4 @@
-/* $Id: XWindow.c,v 1.7 2000/03/28 07:22:15 reinelt Exp $
+/* $Id: XWindow.c,v 1.8 2000/03/28 08:48:33 reinelt Exp $
  *
  * X11 Driver for LCD4Linux 
  *
@@ -20,6 +20,10 @@
  *
  *
  * $Log: XWindow.c,v $
+ * Revision 1.8  2000/03/28 08:48:33  reinelt
+ *
+ * README.X11 added
+ *
  * Revision 1.7  2000/03/28 07:22:15  reinelt
  *
  * version 0.95 released
@@ -118,7 +122,7 @@ void shmcleanup() {
 }
 
 void quit(int nsig) {
-	printf("pid%d got signal %d\n",getpid(),nsig);
+	printf("X11: pid %d got signal %d\n",getpid(),nsig);
 	semcleanup();
 	shmcleanup();
 	exit(0);
@@ -187,7 +191,7 @@ XColor co_dummy;
 XEvent ev;
 
 	if ((dp=XOpenDisplay(NULL))==NULL) {
-		fprintf(stderr,"can't open display\n");
+		fprintf(stderr,"X11: can't open display\n");
 		return -1;
 	}
 	sc=DefaultScreen(dp);
@@ -198,22 +202,22 @@ XEvent ev;
 	cm=DefaultColormap(dp,sc);
 
 	if (XAllocNamedColor(dp,cm,rgbfg,&co[0],&co_dummy)==False) {
-		fprintf(stderr,"can't alloc foreground color '%s'\n",
+		fprintf(stderr,"X11: can't alloc foreground color '%s'\n",
 			rgbfg);
 		return -1;
 	}
 	if (XAllocNamedColor(dp,cm,rgbbg,&co[1],&co_dummy)==False) {
-		fprintf(stderr,"can't alloc background color '%s'\n",
+		fprintf(stderr,"X11: can't alloc background color '%s'\n",
 			rgbbg);
 		return -1;
 	}
 	if (XAllocNamedColor(dp,cm,rgbhg,&co[2],&co_dummy)==False) {
-		fprintf(stderr,"can't alloc halfground color '%s'\n",
+		fprintf(stderr,"X11: can't alloc halfground color '%s'\n",
 			rgbhg);
 		return -1;
 	}
 	if (XAllocNamedColor(dp,cm,"#e0e0e0",&db,&co_dummy)==False) {
-		fprintf(stderr,"can't alloc db color '%s'\n",
+		fprintf(stderr,"X11: can't alloc db color '%s'\n",
 			"#0000ff");
 		return -1;
 	}
-- 
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