[lcd4linux @ 2006-07-31 03:48:09 by reinelt]

preparations for scrolling

16 files changed, 359 insertions, 180 deletions

diff --git a/Makefile.am b/Makefile.am
index b52d8a5..64ce9c5 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -18,6 +18,7 @@ lcd4linux.c                   \
 cfg.c         cfg.h           \
 debug.c       debug.h         \
 drv.c         drv.h           \
+drv_generic.c drv_generic.h   \
 evaluator.c   evaluator.h     \
 hash.c        hash.h          \
 layout.c      layout.h        \
@@ -32,7 +33,7 @@ widget.c      widget.h        \
 widget_text.c widget_text.h   \
 widget_bar.c  widget_bar.h    \
 widget_icon.c widget_icon.h   \
-widget_keypad.c widget_keypad.h    \
+widget_keypad.c widget_keypad.h \
 widget_timer.c widget_timer.h \
 widget_gpo.c  widget_gpo.h    \
                               \
diff --git a/Makefile.in b/Makefile.in
index 7329470..d69e22c 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -58,15 +58,16 @@ am__installdirs = "$(DESTDIR)$(bindir)"
 binPROGRAMS_INSTALL = $(INSTALL_PROGRAM)
 PROGRAMS = $(bin_PROGRAMS)
 am_lcd4linux_OBJECTS = lcd4linux.$(OBJEXT) cfg.$(OBJEXT) \
-	debug.$(OBJEXT) drv.$(OBJEXT) evaluator.$(OBJEXT) \
-	hash.$(OBJEXT) layout.$(OBJEXT) pid.$(OBJEXT) timer.$(OBJEXT) \
-	thread.$(OBJEXT) udelay.$(OBJEXT) qprintf.$(OBJEXT) \
-	rgb.$(OBJEXT) widget.$(OBJEXT) widget_text.$(OBJEXT) \
-	widget_bar.$(OBJEXT) widget_icon.$(OBJEXT) \
-	widget_keypad.$(OBJEXT) widget_timer.$(OBJEXT) \
-	widget_gpo.$(OBJEXT) plugin.$(OBJEXT) plugin_cfg.$(OBJEXT) \
-	plugin_math.$(OBJEXT) plugin_string.$(OBJEXT) \
-	plugin_test.$(OBJEXT) plugin_time.$(OBJEXT)
+	debug.$(OBJEXT) drv.$(OBJEXT) drv_generic.$(OBJEXT) \
+	evaluator.$(OBJEXT) hash.$(OBJEXT) layout.$(OBJEXT) \
+	pid.$(OBJEXT) timer.$(OBJEXT) thread.$(OBJEXT) \
+	udelay.$(OBJEXT) qprintf.$(OBJEXT) rgb.$(OBJEXT) \
+	widget.$(OBJEXT) widget_text.$(OBJEXT) widget_bar.$(OBJEXT) \
+	widget_icon.$(OBJEXT) widget_keypad.$(OBJEXT) \
+	widget_timer.$(OBJEXT) widget_gpo.$(OBJEXT) plugin.$(OBJEXT) \
+	plugin_cfg.$(OBJEXT) plugin_math.$(OBJEXT) \
+	plugin_string.$(OBJEXT) plugin_test.$(OBJEXT) \
+	plugin_time.$(OBJEXT)
 lcd4linux_OBJECTS = $(am_lcd4linux_OBJECTS)
 DEFAULT_INCLUDES = -I. -I$(srcdir) -I.
 depcomp = $(SHELL) $(top_srcdir)/depcomp
@@ -192,6 +193,7 @@ lcd4linux.c                   \
 cfg.c         cfg.h           \
 debug.c       debug.h         \
 drv.c         drv.h           \
+drv_generic.c drv_generic.h   \
 evaluator.c   evaluator.h     \
 hash.c        hash.h          \
 layout.c      layout.h        \
@@ -206,7 +208,7 @@ widget.c      widget.h        \
 widget_text.c widget_text.h   \
 widget_bar.c  widget_bar.h    \
 widget_icon.c widget_icon.h   \
-widget_keypad.c widget_keypad.h    \
+widget_keypad.c widget_keypad.h \
 widget_timer.c widget_timer.h \
 widget_gpo.c  widget_gpo.h    \
                               \
@@ -426,6 +428,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/drv_USBLCD.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/drv_WincorNixdorf.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/drv_X11.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/drv_generic.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/drv_generic_gpio.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/drv_generic_graphic.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/drv_generic_i2c.Po@am__quote@
diff --git a/configure.in b/configure.in
index 38f1c1b..ca233da 100644
--- a/configure.in
+++ b/configure.in
@@ -22,7 +22,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-AC_PREREQ(2.59e)
+AC_PREREQ(2.59)
 AC_INIT([LCD4Linux],[0.10.1-CVS],[lcd4linux-users@lists.sourceforge.net])
 AC_CONFIG_SRCDIR([lcd4linux.c])
 AM_INIT_AUTOMAKE([lcd4linux],0.10.1-CVS)
diff --git a/drv.c b/drv.c
index c61bebe..912ae7a 100644
--- a/drv.c
+++ b/drv.c
@@ -1,4 +1,4 @@
-/* $Id: drv.c,v 1.40 2006/04/14 20:59:38 harbaum Exp $
+/* $Id: drv.c,v 1.41 2006/07/31 03:48:09 reinelt Exp $
  *
  * new framework for display drivers
  *
@@ -23,6 +23,9 @@
  *
  *
  * $Log: drv.c,v $
+ * Revision 1.41  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *
  * Revision 1.40  2006/04/14 20:59:38  harbaum
  * Disable inclusion of Image driver in drv.c if no gd was found.
  *
@@ -187,27 +190,6 @@
  * drv_init (char *driver)
  *    initializes the named driver
  *
- * drv_query (int *rows, int *cols, int *xres, int *yres, int *bars, int *gpos)
- *    queries the attributes of the selected driver
- *
- * drv_clear ()
- *    clears the display
- *
- * int drv_put (int row, int col, char *text)
- *    writes text at row, col
- *
- * int drv_bar (int type, int row, int col, int max, int len1, int len2)
- *    draws a specified bar at row, col with len
- *
- * int drv_icon (int num, int seq, int row, int col)
- *    draws icon #num sequence #seq at row, col
- *
- * int drv_gpo (int num, int val)
- *    sets GPO #num to val
- *
- * int drv_flush (void)
- *    flushes the framebuffer to the display
- *
  * int drv_quit (void)
  *    de-initializes the driver
  */
diff --git a/drv_generic.c b/drv_generic.c
new file mode 100644
index 0000000..d898a85
--- /dev/null
+++ b/drv_generic.c
@@ -0,0 +1,119 @@
+/* $Id: drv_generic.c,v 1.4 2006/07/31 03:48:09 reinelt Exp $
+ *
+ * generic driver helper
+ *
+ * Copyright (C) 2006 Michael Reinelt <reinelt@eunet.at>
+ * Copyright (C) 2006 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * LCD4Linux is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * $Log: drv_generic.c,v $
+ * Revision 1.4  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *
+ */
+
+/* 
+ *
+ * exported functions:
+ *
+ * drv_generic_init (void)
+ *   initializes generic stuff and registers plugins
+ *
+ */
+
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "debug.h"
+#include "plugin.h"
+#include "drv_generic.h"
+
+#ifdef WITH_DMALLOC
+#include <dmalloc.h>
+#endif
+
+/* these values are chars (text displays) or pixels (graphic displays) */
+
+int LROWS = 0;			/* layout size: rows */
+int LCOLS = 0;			/* layout size: columns */
+
+int DROWS = 4;			/* display size:  rows */
+int DCOLS = 20;			/* display size: columns */
+
+int XRES = 6;			/* pixel widtht of one char */
+int YRES = 8;			/* pixel height of one char */
+
+
+void (*drv_generic_blit) () = NULL;
+
+
+static void my_drows(RESULT * result)
+{
+    double value = DROWS;
+    SetResult(&result, R_NUMBER, &value);
+}
+
+static void my_dcols(RESULT * result)
+{
+    double value = DCOLS;
+    SetResult(&result, R_NUMBER, &value);
+}
+
+static void my_xres(RESULT * result)
+{
+    double value = XRES;
+    SetResult(&result, R_NUMBER, &value);
+}
+
+static void my_yres(RESULT * result)
+{
+    double value = YRES;
+    SetResult(&result, R_NUMBER, &value);
+}
+
+static void my_lrows(RESULT * result)
+{
+    double value = LROWS;
+    SetResult(&result, R_NUMBER, &value);
+}
+
+static void my_lcols(RESULT * result)
+{
+    double value = LCOLS;
+    SetResult(&result, R_NUMBER, &value);
+}
+
+int drv_generic_init(void)
+{
+
+    AddFunction("LCD::height", 0, my_drows);
+    AddFunction("LCD::width", 0, my_dcols);
+
+    AddFunction("LCD::xres", 0, my_xres);
+    AddFunction("LCD::yres", 0, my_yres);
+
+    AddFunction("Layout::height", 0, my_lrows);
+    AddFunction("Layout::width", 0, my_lcols);
+
+    return 0;
+}
diff --git a/drv_generic.h b/drv_generic.h
new file mode 100644
index 0000000..e013fbd
--- /dev/null
+++ b/drv_generic.h
@@ -0,0 +1,47 @@
+/* $Id: drv_generic.h,v 1.4 2006/07/31 03:48:09 reinelt Exp $
+ *
+ * generic driver helper
+ *
+ * Copyright (C) 2006 Michael Reinelt <reinelt@eunet.at>
+ * Copyright (C) 2006 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * LCD4Linux is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * $Log: drv_generic.h,v $
+ * Revision 1.4  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *
+ */
+
+
+#ifndef _DRV_GENERIC_H_
+#define _DRV_GENERIC_H_
+
+/* these values are chars (text displays) or pixels (graphic displays) */
+
+extern int LROWS, LCOLS;	/* layout size */
+extern int DROWS, DCOLS;	/* display size */
+
+extern int XRES, YRES;		/* pixel width/height of one char */
+
+/* these function must be implemented by the generic driver */
+extern void (*drv_generic_blit) (const int row, const int col, const int height, const int width);
+
+int drv_generic_init(void);
+
+#endif
diff --git a/drv_generic_graphic.c b/drv_generic_graphic.c
index bf11a24..197450c 100644
--- a/drv_generic_graphic.c
+++ b/drv_generic_graphic.c
@@ -1,4 +1,4 @@
-/* $Id
+/* $Id: drv_generic_graphic.c,v 1.29 2006/07/31 03:48:09 reinelt Exp $
  *
  * generic driver helper for graphic displays
  *
@@ -23,6 +23,9 @@
  *
  *
  * $Log: drv_generic_graphic.c,v $
+ * Revision 1.29  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *
  * Revision 1.28  2006/06/20 08:50:58  reinelt
  * widget_image linker error hopefully finally fixed
  *
@@ -174,6 +177,7 @@
 #include "widget_image.h"
 #include "rgb.h"
 #include "drv.h"
+#include "drv_generic.h"
 #include "drv_generic_graphic.h"
 #include "font_6x8.h"
 
@@ -181,9 +185,6 @@
 #include <dmalloc.h>
 #endif
 
-int DROWS, DCOLS;		/* display size (pixels!) */
-int XRES, YRES;			/* pixels of one char cell */
-
 /* pixel colors */
 RGBA FG_COL = { R: 0x00, G: 0x00, B: 0x00, A:0xff };
 RGBA BG_COL = { R: 0xff, G: 0xff, B: 0xff, A:0xff };
@@ -193,10 +194,6 @@ RGBA NO_COL = { R: 0x00, G: 0x00, B: 0x00, A:0x00 };
 static char *Section = NULL;
 static char *Driver = NULL;
 
-/* layout size  (pixels!) */
-static int LROWS = 0;
-static int LCOLS = 0;
-
 /* framebuffer */
 static RGBA *drv_generic_graphic_FB[LAYERS] = { NULL, };
 
@@ -647,6 +644,9 @@ int drv_generic_graphic_init(const char *section, const char *driver)
 	}
     }
 
+    /* init generic driver & register plugins */
+    drv_generic_init();
+
     /* set default colors */
     color = cfg_get(Section, "foreground", "000000ff");
     if (color2RGBA(color, &FG_COL) < 0) {
diff --git a/drv_generic_graphic.h b/drv_generic_graphic.h
index c51dfdc..106ac2a 100644
--- a/drv_generic_graphic.h
+++ b/drv_generic_graphic.h
@@ -1,4 +1,4 @@
-/* $Id: drv_generic_graphic.h,v 1.12 2006/02/27 06:14:46 reinelt Exp $
+/* $Id: drv_generic_graphic.h,v 1.13 2006/07/31 03:48:09 reinelt Exp $
  *
  * generic driver helper for graphic displays
  *
@@ -23,6 +23,9 @@
  *
  *
  * $Log: drv_generic_graphic.h,v $
+ * Revision 1.13  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *
  * Revision 1.12  2006/02/27 06:14:46  reinelt
  * graphic bug resulting in all black pixels solved
  *
@@ -76,12 +79,10 @@
 #ifndef _DRV_GENERIC_GRAPHIC_H_
 #define _DRV_GENERIC_GRAPHIC_H_
 
+#include "drv_generic.h"
 #include "widget.h"
 #include "rgb.h"
 
-extern int DROWS, DCOLS;	/* display size */
-extern int XRES, YRES;		/* pixel width/height of one char  */
-
 extern RGBA FG_COL;		/* foreground color */
 extern RGBA HG_COL;		/* halfground color */
 extern RGBA BG_COL;		/* background color */
diff --git a/drv_generic_i2c.c b/drv_generic_i2c.c
index a77d020..b9ef1b6 100644
--- a/drv_generic_i2c.c
+++ b/drv_generic_i2c.c
@@ -1,4 +1,4 @@
-/* $Id: drv_generic_i2c.c,v 1.7 2006/07/30 11:16:27 lfcorreia Exp $
+/* $Id: drv_generic_i2c.c,v 1.8 2006/07/31 03:48:09 reinelt Exp $
  *
  * generic driver helper for i2c displays
  *
@@ -23,6 +23,9 @@
  *
  *
  * $Log: drv_generic_i2c.c,v $
+ * Revision 1.8  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *
  * Revision 1.7  2006/07/30 11:16:27  lfcorreia
  * Add back drv_generic_i2c_close function
  *
@@ -142,18 +145,18 @@ int drv_generic_i2c_open(const char *section, const char *driver)
     }
 
     info("%s: initializing I2C slave device 0x%x", Driver, dev);
-    if (i2c_smbus_write_quick(i2c_device, I2C_SMBUS_WRITE) < 0 ){
+    if (i2c_smbus_write_quick(i2c_device, I2C_SMBUS_WRITE) < 0) {
 	error("%s: error initializing device 0x%x\n", Driver, dev);
 	close(i2c_device);
-		}
+    }
 
     return 0;
 
   exit_error:
     free(bus);
     free(device);
-		close(i2c_device);
-		return -1;
+    close(i2c_device);
+    return -1;
 }
 
 int drv_generic_i2c_close(void)
diff --git a/drv_generic_i2c.h b/drv_generic_i2c.h
index e30e8f8..579fcbe 100644
--- a/drv_generic_i2c.h
+++ b/drv_generic_i2c.h
@@ -1,4 +1,4 @@
-/* $Id: drv_generic_i2c.h,v 1.6 2006/02/27 06:15:55 reinelt Exp $

+/* $Id: drv_generic_i2c.h,v 1.7 2006/07/31 03:48:09 reinelt Exp $

  *

  * generic driver helper for i2c displays

  *

@@ -23,14 +23,17 @@
  *

  *

  * $Log: drv_generic_i2c.h,v $
- * Revision 1.6  2006/02/27 06:15:55  reinelt
- * indent...
- *
- * Revision 1.5  2006/02/25 13:36:33  geronet
- * updated indent.sh, applied coding style
- *
- * Revision 1.4  2005/05/31 21:32:00  lfcorreia
- * fix my email address
+ * Revision 1.7  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *

+ * Revision 1.6  2006/02/27 06:15:55  reinelt

+ * indent...

+ *

+ * Revision 1.5  2006/02/25 13:36:33  geronet

+ * updated indent.sh, applied coding style

+ *

+ * Revision 1.4  2005/05/31 21:32:00  lfcorreia

+ * fix my email address

  *

  * Revision 1.3  2005/05/31 20:42:55  lfcorreia

  * new file: lcd4linux_i2c.h

@@ -82,4 +85,4 @@
 
void drv_generic_i2c_data(const unsigned char data);
 
void drv_generic_i2c_command(const unsigned char command, const unsigned char *data, const unsigned char length);
 


-#endif				/* 
 */
+#endif	/* 
 */
diff --git a/drv_generic_text.c b/drv_generic_text.c
index 8be347c..4bcbb51 100644
--- a/drv_generic_text.c
+++ b/drv_generic_text.c
@@ -1,4 +1,4 @@
-/* $Id: drv_generic_text.c,v 1.35 2006/03/29 08:57:58 reinelt Exp $
+/* $Id: drv_generic_text.c,v 1.36 2006/07/31 03:48:09 reinelt Exp $
  *
  * generic driver helper for text-based displays
  *
@@ -23,6 +23,9 @@
  *
  *
  * $Log: drv_generic_text.c,v $
+ * Revision 1.36  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *
  * Revision 1.35  2006/03/29 08:57:58  reinelt
  * vertical bar patch from Manuel Lausch
  *
@@ -166,8 +169,6 @@
  *
  * exported variables:
  *
- * extern int DROWS, DCOLS;    display size
- * extern int XRES,  YRES;     pixel width/height of one char
  * extern int CHARS, CHAR0;    number of user-defineable characters, ASCII of first char
  * extern int ICONS;           number of user-defineable characters reserved for icons
  * extern int GOTO_COST;       number of bytes a goto command requires
@@ -232,6 +233,7 @@
 #include "widget_icon.h"
 #include "widget_bar.h"
 #include "drv.h"
+#include "drv_generic.h"
 #include "drv_generic_text.h"
 
 #ifdef WITH_DMALLOC
@@ -260,11 +262,6 @@ typedef struct {
 static char *Section = NULL;
 static char *Driver = NULL;
 
-
-int DROWS = 20;			/* display size: rows */
-int DCOLS = 4;			/* display size: columns */
-int XRES = 6;			/* pixels of one char cell */
-int YRES = 8;			/* pixels of one char cell */
 int CHARS = 0;			/* number of user-defineable characters */
 int CHAR0 = 0;			/* ASCII of first user-defineable char */
 int ICONS = 0;			/* number of user-defineable characters reserved for icons */
@@ -277,11 +274,9 @@ void (*drv_generic_text_real_write) () = NULL;
 void (*drv_generic_text_real_defchar) () = NULL;
 
 
-static int LROWS = 20;		/* layout size: rows */
-static int LCOLS = 4;		/* layout size: columns */
-
 static char *LayoutFB = NULL;
 static char *DisplayFB = NULL;
+static int *L2D = NULL;
 
 static int Single_Segments = 0;
 
@@ -291,7 +286,6 @@ static SEGMENT Segment[128];
 static BAR *BarFB = NULL;
 
 
-
 /****************************************/
 /*** generic Framebuffer stuff        ***/
 /****************************************/
@@ -299,6 +293,7 @@ static BAR *BarFB = NULL;
 static void drv_generic_text_resizeFB(int rows, int cols)
 {
     char *newFB;
+    int *newL2D;
     BAR *newBar;
     int i, row, col;
 
@@ -313,8 +308,8 @@ static void drv_generic_text_resizeFB(int rows, int cols)
 	cols = LCOLS;
 
     /* allocate new Layout FB */
-    newFB = malloc(cols * rows * sizeof(char));
-    memset(newFB, ' ', rows * cols * sizeof(char));
+    newFB = malloc(cols * rows * sizeof(*newFB));
+    memset(newFB, ' ', rows * cols * sizeof(*newFB));
 
     /* transfer contents */
     if (LayoutFB != NULL) {
@@ -327,6 +322,26 @@ static void drv_generic_text_resizeFB(int rows, int cols)
     }
     LayoutFB = newFB;
 
+    /* allocate new transformer */
+    newL2D = malloc(cols * rows * sizeof(*newL2D));
+
+    /* intitialize translator */
+    for (row = 0; row < rows; row++) {
+	for (col = 0; col < cols; col++) {
+	    newL2D[row * cols + col] = row * DCOLS + col;
+	}
+    }
+
+    /* transfer transformer */
+    if (L2D != NULL) {
+	for (row = 0; row < LROWS; row++) {
+	    for (col = 0; col < LCOLS; col++) {
+		newL2D[row * cols + col] = L2D[row * LCOLS + col];
+	    }
+	}
+	free(L2D);
+    }
+    L2D = newL2D;
 
     /* resize Bar buffer */
     if (BarFB) {
@@ -357,6 +372,54 @@ static void drv_generic_text_resizeFB(int rows, int cols)
 }
 
 
+static void drv_generic_text_blit(const int row, const int col, const int height, const int width)
+{
+    int lr, lc;			/* layout  row/col */
+    int dr, dc;			/* display row/col */
+    int p1, p2;			/* start/end positon of changed area */
+    int eq;			/* counter for equal contents */
+
+    /* loop over layout rows */
+    for (lr = row; lr < LROWS && lr < row + height; lr++) {
+	/* transform layout to display row */
+	dr = lr;
+	/* sanity check */
+	if (dr < 0 || dr >= DROWS)
+	    continue;
+	/* loop over layout cols */
+	for (lc = col; lc < LCOLS && lc < col + width; lc++) {
+	    /* transform layout to display column */
+	    dc = lc;
+	    /* sanity check */
+	    if (dc < 0 || dc >= DCOLS)
+		continue;
+	    /* find start of difference */
+	    if (DisplayFB[dr * DCOLS + dc] == LayoutFB[lr * LCOLS + lc])
+		continue;
+	    /* find end of difference */
+	    for (p1 = dc, p2 = p1, eq = 0, lc++; lc < LCOLS && lc < col + width; lc++) {
+		/* transform layout to display column */
+		dc = lc;
+		/* sanity check */
+		if (dc < 0 || dc >= DCOLS)
+		    continue;
+		if (DisplayFB[dr * DCOLS + dc] == LayoutFB[lr * LCOLS + lc]) {
+		    if (++eq > GOTO_COST)
+			break;
+		} else {
+		    p2 = dc;
+		    eq = 0;
+		}
+	    }
+	    /* send to display */
+	    memcpy(DisplayFB + dr * DCOLS + p1, LayoutFB + lr * LCOLS + p1, p2 - p1 + 1);
+	    if (drv_generic_text_real_write)
+		drv_generic_text_real_write(dr, p1, DisplayFB + dr * DCOLS + p1, p2 - p1 + 1);
+	}
+    }
+}
+
+
 /****************************************/
 /*** generic text handling            ***/
 /****************************************/
@@ -368,21 +431,26 @@ int drv_generic_text_init(const char *section, const char *driver)
     Driver = (char *) driver;
 
     /* init display framebuffer */
-    DisplayFB = (char *) malloc(DCOLS * DROWS * sizeof(char));
-    memset(DisplayFB, ' ', DROWS * DCOLS * sizeof(char));
+    DisplayFB = (char *) malloc(DCOLS * DROWS * sizeof(*DisplayFB));
+    memset(DisplayFB, ' ', DROWS * DCOLS * sizeof(*DisplayFB));
 
     /* init layout framebuffer */
     LROWS = 0;
     LCOLS = 0;
     LayoutFB = NULL;
+    L2D = NULL;
     drv_generic_text_resizeFB(DROWS, DCOLS);
 
     /* sanity check */
-    if (LayoutFB == NULL || DisplayFB == NULL) {
+    if (DisplayFB == NULL || LayoutFB == NULL || L2D == NULL) {
 	error("%s: framebuffer could not be allocated: malloc() failed", Driver);
 	return -1;
     }
 
+    /* init generic driver & register plugins */
+    drv_generic_blit = drv_generic_text_blit;
+    drv_generic_init();
+
     return 0;
 }
 
@@ -452,46 +520,22 @@ int drv_generic_text_greet(const char *msg1, const char *msg2)
 int drv_generic_text_draw(WIDGET * W)
 {
     WIDGET_TEXT *Text = W->data;
-    char *txt, *fb1, *fb2;
-    int row, col, col0, len, end;
+    char *txt;
+    int row, col, len;
 
     row = W->row;
     col = W->col;
     txt = Text->buffer;
     len = strlen(txt);
-    end = col + len;
 
     /* maybe grow layout framebuffer */
     drv_generic_text_resizeFB(row + 1, col + len);
 
-    fb1 = LayoutFB + row * LCOLS;
-    fb2 = DisplayFB + row * DCOLS;
-
     /* transfer new text into layout buffer */
-    memcpy(fb1 + col, txt, len);
+    memcpy(LayoutFB + row * LCOLS + col, txt, len);
 
-    if (row < DROWS) {
-	for (; col <= end && col < DCOLS; col++) {
-	    int pos1, pos2, equal;
-	    if (fb1[col] == fb2[col])
-		continue;
-	    col0 = col;
-	    for (pos1 = col, pos2 = pos1, col++, equal = 0; col <= end && col < DCOLS; col++) {
-		if (fb1[col] == fb2[col]) {
-		    /* If we find just one equal byte, we don't break, because this  */
-		    /* would require a goto, which takes several bytes, too. */
-		    if (GOTO_COST >= 0 && ++equal > GOTO_COST)
-			break;
-		} else {
-		    pos2 = col;
-		    equal = 0;
-		}
-	    }
-	    memcpy(fb2 + pos1, fb1 + pos1, pos2 - pos1 + 1);
-	    if (drv_generic_text_real_write)
-		drv_generic_text_real_write(row, col0, fb2 + pos1, pos2 - pos1 + 1);
-	}
-    }
+    /* blit it */
+    drv_generic_text_blit(row, col, 1, len);
 
     return 0;
 }
@@ -500,20 +544,26 @@ int drv_generic_text_draw(WIDGET * W)
 int drv_generic_text_quit(void)
 {
 
+    if (DisplayFB) {
+	free(DisplayFB);
+	DisplayFB = NULL;
+    }
+
     if (LayoutFB) {
 	free(LayoutFB);
 	LayoutFB = NULL;
     }
 
-    if (DisplayFB) {
-	free(DisplayFB);
-	DisplayFB = NULL;
+    if (L2D) {
+	free(L2D);
+	L2D = NULL;
     }
 
     if (BarFB) {
 	free(BarFB);
 	BarFB = NULL;
     }
+
     widget_unregister();
 
     return (0);
@@ -540,7 +590,6 @@ int drv_generic_text_icon_draw(WIDGET * W)
     static int icon_counter = 0;
     WIDGET_ICON *Icon = W->data;
     int row, col;
-    int l_idx, d_idx;
     int invalidate = 0;
     unsigned char ascii;
 
@@ -576,20 +625,17 @@ int drv_generic_text_icon_draw(WIDGET * W)
     /* use blank if invisible */
     ascii = Icon->visible ? Icon->ascii : ' ';
 
-    /* index into the two framebuffers */
-    l_idx = row * LCOLS + col;
-    d_idx = row * DCOLS + col;
-
     /* transfer icon into layout buffer */
-    LayoutFB[l_idx] = ascii;
+    LayoutFB[row * LCOLS + col] = ascii;
 
-    /* maybe send icon to the display */
-    if (row < DROWS && col < DCOLS && (DisplayFB[d_idx] != ascii || invalidate)) {
-	DisplayFB[d_idx] = ascii;
-	if (drv_generic_text_real_write)
-	    drv_generic_text_real_write(row, col, DisplayFB + d_idx, 1);
+    /* ugly invalidation: change display FB to a wrong value so blit() will really send it */
+    if (invalidate) {
+	DisplayFB[row * DCOLS + col] = ~ascii;
     }
 
+    /* blit it */
+    drv_generic_text_blit(row, col, 1, 1);
+
     return 0;
 
 }
@@ -1005,7 +1051,7 @@ static void drv_generic_text_bar_define_chars(void)
 int drv_generic_text_bar_draw(WIDGET * W)
 {
     WIDGET_BAR *Bar = W->data;
-    int row, col, col0, len, res, max, val1, val2;
+    int row, col, len, res, max, val1, val2;
     int c, n, s;
     DIRECTION dir;
     STYLE style;
@@ -1077,34 +1123,15 @@ int drv_generic_text_bar_draw(WIDGET * W)
 	    /* maybe invalidate display framebuffer */
 	    if (BarFB[n].invalid) {
 		BarFB[n].invalid = 0;
+		/* ugly invalidation: change display FB to a wrong value so blit() will really send it */
 		DisplayFB[row * DCOLS + col] = ~LayoutFB[n];
 	    }
 	}
     }
 
-    /* transfer differences to the display */
-    for (row = 0; row < DROWS; row++) {
-	for (col = 0; col < DCOLS; col++) {
-	    int pos1, pos2, equal;
-	    if (LayoutFB[row * LCOLS + col] == DisplayFB[row * DCOLS + col])
-		continue;
-	    col0 = col;
-	    for (pos1 = col, pos2 = pos1, col++, equal = 0; col < DCOLS; col++) {
-		if (LayoutFB[row * LCOLS + col] == DisplayFB[row * DCOLS + col]) {
-		    /* If we find just one equal byte, we don't break, because this  */
-		    /* would require a goto, which takes several bytes, too. */
-		    if (++equal > GOTO_COST)
-			break;
-		} else {
-		    pos2 = col;
-		    equal = 0;
-		}
-	    }
-	    memcpy(DisplayFB + row * DCOLS + pos1, LayoutFB + row * LCOLS + pos1, pos2 - pos1 + 1);
-	    if (drv_generic_text_real_write)
-		drv_generic_text_real_write(row, col0, DisplayFB + row * DCOLS + pos1, pos2 - pos1 + 1);
-	}
-    }
+    /* blit whole layout FB */
+    drv_generic_text_blit(0, 0, LROWS, LCOLS);
+
 
     return 0;
 
diff --git a/drv_generic_text.h b/drv_generic_text.h
index 61e9320..1ba9b1b 100644
--- a/drv_generic_text.h
+++ b/drv_generic_text.h
@@ -1,4 +1,4 @@
-/* $Id: drv_generic_text.h,v 1.20 2006/01/30 05:47:38 reinelt Exp $
+/* $Id: drv_generic_text.h,v 1.21 2006/07/31 03:48:09 reinelt Exp $
  *
  * generic driver helper for text-based displays
  *
@@ -23,6 +23,9 @@
  *
  *
  * $Log: drv_generic_text.h,v $
+ * Revision 1.21  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *
  * Revision 1.20  2006/01/30 05:47:38  reinelt
  * graphic subsystem changed to full-color RGBA
  *
@@ -108,12 +111,9 @@
 #define _DRV_GENERIC_TEXT_H_
 
 
-#include <termios.h>
+#include "drv_generic.h"
 #include "widget.h"
 
-
-extern int DROWS, DCOLS;	/* display size */
-extern int XRES, YRES;		/* pixel width/height of one char  */
 extern int CHARS, CHAR0;	/* number of user-defineable characters, ASCII of first char */
 extern int ICONS;		/* number of user-defineable characters reserved for icons */
 extern int GOTO_COST;		/* number of bytes a goto command requires */
diff --git a/lcd4linux.conf.sample b/lcd4linux.conf.sample
index 123a14d..884eb84 100644
--- a/lcd4linux.conf.sample
+++ b/lcd4linux.conf.sample
@@ -474,7 +474,6 @@ Widget BusyBar {
     expression2 proc_stat::cpu('system', 500)
     length 10	
     direction 'E'
-    style 'H'
     update tack
 }
 
@@ -1052,14 +1051,14 @@ Layout testMySQL {
 #Display 'BWCT'
 #Display 'Image'
 #Display 'Trefon'
-#Display 'LCD2USB'
+Display 'LCD2USB'
 #Display 'LPH7508-serdisplib'
-Display 'LPH7508'
+#Display 'LPH7508'
 #Display 'ctinclud'
 
-#Layout 'Default'
+Layout 'Default'
 #Layout 'TestLayer'
-Layout 'TestImage'
+#Layout 'TestImage'
 #Layout 'L8x2'
 #Layout 'L16x1'
 #Layout 'L16x2'
diff --git a/plugin.c b/plugin.c
index b2f924b..00f26ee 100644
--- a/plugin.c
+++ b/plugin.c
@@ -1,4 +1,4 @@
-/* $Id: plugin.c,v 1.43 2006/07/30 11:29:02 lfcorreia Exp $
+/* $Id: plugin.c,v 1.44 2006/07/31 03:48:09 reinelt Exp $
  *
  * plugin handler for the Evaluator
  *
@@ -23,6 +23,9 @@
  *
  *
  * $Log: plugin.c,v $
+ * Revision 1.44  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *
  * Revision 1.43  2006/07/30 11:29:02  lfcorreia
  * Make changes suggested by Michael, only one init function is needed
  *
@@ -286,7 +289,6 @@ int plugin_init(void)
     plugin_init_cfg();
     plugin_init_math();
     plugin_init_string();
-    plugin_init_strupper();
     plugin_init_test();
     plugin_init_time();
 
diff --git a/plugin_string.c b/plugin_string.c
index 7684f67..1aeb478 100644
--- a/plugin_string.c
+++ b/plugin_string.c
@@ -1,4 +1,4 @@
-/* $Id: plugin_string.c,v 1.10 2006/07/30 11:29:02 lfcorreia Exp $
+/* $Id: plugin_string.c,v 1.11 2006/07/31 03:48:09 reinelt Exp $
  *
  * string plugin
  *
@@ -23,6 +23,9 @@
  *
  *
  * $Log: plugin_string.c,v $
+ * Revision 1.11  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *
  * Revision 1.10  2006/07/30 11:29:02  lfcorreia
  * Make changes suggested by Michael, only one init function is needed
  *
@@ -77,6 +80,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <ctype.h>
 
 #include "debug.h"
 #include "plugin.h"
@@ -89,29 +93,17 @@ static void my_strlen(RESULT * result, RESULT * arg1)
 }
 
 /* 'upcase' function (shamelessly stolen from plugin_sample.c)*/
-/* takes one argument, a string */
 /* returns the string in upper case letters */
-
-static void my_upcase(RESULT * result, RESULT * arg1)
+static void my_strupper(RESULT * result, RESULT * arg1)
 {
     char *value, *p;
 
-    /* create a local copy of the argument */
-    /* Do *NOT* try to modify the original string! */
     value = strdup(R2S(arg1));
 
-    /* process the string */
     for (p = value; *p != '\0'; p++)
 	*p = toupper(*p);
 
-    /* store result */
-    /* when called with R_STRING, it assumes the */
-    /* next parameter to be a pointer to a string */
-    /* 'value' is already a char*, so use 'value', not '&value' */
     SetResult(&result, R_STRING, value);
-
-    /* free local copy again */
-    /* Note that SetResult() makes its own string copy  */
     free(value);
 }
 
@@ -120,14 +112,11 @@ int plugin_init_string(void)
 
     /* register some basic string functions */
     AddFunction("strlen", 1, my_strlen);
-
-    /* register my UPPERCASE transforming function */
-    AddFunction("strupper", 1, my_upcase);
-
+    AddFunction("strupper", 1, my_strupper);
     return 0;
 }
 
 void plugin_exit_string(void)
 {
     /* empty */
-}
\ No newline at end of file
+}
diff --git a/widget_timer.c b/widget_timer.c
index 0190acd..4c6b055 100644
--- a/widget_timer.c
+++ b/widget_timer.c
@@ -1,4 +1,4 @@
-/* $Id: widget_timer.c,v 1.2 2006/02/25 13:36:33 geronet Exp $
+/* $Id: widget_timer.c,v 1.3 2006/07/31 03:48:09 reinelt Exp $
  *
  * timer widget handling
  *
@@ -21,6 +21,9 @@
  *
  *
  * $Log: widget_timer.c,v $
+ * Revision 1.3  2006/07/31 03:48:09  reinelt
+ * preparations for scrolling
+ *
  * Revision 1.2  2006/02/25 13:36:33  geronet
  * updated indent.sh, applied coding style
  *
@@ -109,17 +112,17 @@ int widget_timer_init(WIDGET * Self)
     memset(Timer, 0, sizeof(WIDGET_TIMER));
 
     /* get raw expressions (we evaluate them ourselves) */
-    Timer->expression = cfg_get_raw(section, "axpression", NULL);
+    Timer->expression = cfg_get_raw(section, "expression", NULL);
     Timer->update_expr = cfg_get_raw(section, "update", "100");
     Timer->active_expr = cfg_get_raw(section, "active", "1");
 
     /* sanity checks */
     if (Timer->expression == NULL || *Timer->expression == '\0') {
-	error("Timer %s has no expression, using '1'", Self->name);
+	error("Timer '%s' has no expression, using '1'", Self->name);
 	Timer->expression = "1";
     }
     if (Timer->update_expr == NULL || *Timer->update_expr == '\0') {
-	error("Timer %s has no update, using '100'", Self->name);
+	error("Timer '%s' has no update, using '100'", Self->name);
 	Timer->update_expr = "100";
     }