/* $Id: drv_generic_text.c,v 1.25 2005/02/24 07:06:48 reinelt Exp $
*
* generic driver helper for text-based displays
*
* Copyright (C) 1999, 2000 Michael Reinelt <reinelt@eunet.at>
* Copyright (C) 2004 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_text.c,v $
* Revision 1.25 2005/02/24 07:06:48 reinelt
* SimpleLCD driver added
*
* Revision 1.24 2005/01/18 06:30:23 reinelt
* added (C) to all copyright statements
*
* Revision 1.23 2005/01/09 10:53:24 reinelt
* small type in plugin_uname fixed
* new homepage lcd4linux.bulix.org
*
* Revision 1.22 2004/11/28 15:50:24 reinelt
* Cwlinux fixes (invalidation of user-defined chars)
*
* Revision 1.21 2004/06/26 12:04:59 reinelt
*
* uh-oh... the last CVS log message messed up things a lot...
*
* Revision 1.20 2004/06/26 09:27:21 reinelt
*
* added '-W' to CFLAGS
* changed all C++ comments to C ones
* cleaned up a lot of signed/unsigned mistakes
*
* Revision 1.19 2004/06/26 06:12:15 reinelt
*
* support for Beckmann+Egle Compact Terminals
* some mostly cosmetic changes in the MatrixOrbital and USBLCD driver
* added debugging to the generic serial driver
* fixed a bug in the generic text driver where icons could be drawn outside
* the display bounds
*
* Revision 1.18 2004/06/20 10:09:55 reinelt
*
* 'const'ified the whole source
*
* Revision 1.17 2004/06/05 06:41:40 reinelt
*
* chancged splash screen again
*
* Revision 1.16 2004/06/02 10:09:22 reinelt
*
* splash screen for HD44780
*
* Revision 1.15 2004/06/01 06:45:30 reinelt
*
* some Fixme's processed
* documented some code
*
* Revision 1.14 2004/05/26 11:37:36 reinelt
*
* Curses driver ported.
*
* Revision 1.13 2004/03/19 09:17:46 reinelt
*
* removed the extra 'goto' function, row and col are additional parameters
* of the write() function now.
*
* Revision 1.12 2004/03/03 03:47:04 reinelt
* big patch from Martin Hejl:
* - use qprintf() where appropriate
* - save CPU cycles on gettimeofday()
* - add quit() functions to free allocated memory
* - fixed lots of memory leaks
*
* Revision 1.11 2004/02/15 21:43:43 reinelt
* T6963 driver nearly finished
* framework for graphic displays done
* i2c_sensors patch from Xavier
* some more old generation files removed
*
* Revision 1.10 2004/02/14 11:56:17 reinelt
* M50530 driver ported
* changed lots of 'char' to 'unsigned char'
*
* Revision 1.9 2004/02/07 13:45:23 reinelt
* icon visibility patch #2 from Xavier
*
* Revision 1.8 2004/01/30 20:57:56 reinelt
* HD44780 patch from Martin Hejl
* dmalloc integrated
*
* Revision 1.7 2004/01/29 04:40:02 reinelt
* every .c file includes "config.h" now
*
* Revision 1.6 2004/01/23 07:04:23 reinelt
* icons finished!
*
* Revision 1.5 2004/01/23 04:53:54 reinelt
* icon widget added (not finished yet!)
*
* Revision 1.4 2004/01/22 07:57:45 reinelt
* several bugs fixed where segfaulting on layout>display
* Crystalfontz driver optimized, 632 display already works
*
* Revision 1.3 2004/01/20 14:25:12 reinelt
* some reorganization
* moved drv_generic to drv_generic_serial
* moved port locking stuff to drv_generic_serial
*
* Revision 1.2 2004/01/20 12:45:47 reinelt
* "Default screen" working with MatrixOrbital
*
* Revision 1.1 2004/01/20 05:36:59 reinelt
* moved text-display-specific stuff to drv_generic_text
* moved all the bar stuff from drv_generic_bar to generic_text
*
*/
/*
*
* exported variables:
*
* extern int DROWS, DCOLS; display size
* extern int LROWS, LCOLS; layout 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
* extern int INVALIDATE; re-send a modified userdefined char?
*
*
* these functions must be implemented by the real driver:
*
* void (*drv_generic_text_real_write)(int row, int col, unsigned char *data, int len);
* writes a text of specified length at position (row, col)
*
* void (*drv_generic_text_real_defchar)(int ascii, unsigned char *buffer);
* defines the bitmap of a user-defined character
*
*
* exported fuctions:
*
* int drv_generic_text_init (char *section, char *driver);
* initializes the generic text driver
*
* int drv_generic_text_draw (WIDGET *W);
* renders Text widget into framebuffer
* calls drv_generic_text_real_write()
*
* int drv_generic_text_icon_init (void);
* initializes the generic icon driver
*
* int drv_generic_text_icon_draw (WIDGET *W);
* renders Icon widget into framebuffer
* calls drv_generic_text_real_write() and drv_generic_text_real_defchar()
*
* int drv_generic_text_bar_init (int single_segments);
* initializes the generic icon driver
*
* void drv_generic_text_bar_add_segment (int val1, int val2, DIRECTION dir, int ascii);
* adds a 'fixed' character to the bar-renderer
*
* int drv_generic_text_bar_draw (WIDGET *W);
* renders Bar widget into framebuffer
* calls drv_generic_text_real_write() and drv_generic_text_real_defchar()
*
* int drv_generic_text_quit (void);
* closes the generic text driver
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include "debug.h"
#include "cfg.h"
#include "plugin.h"
#include "widget.h"
#include "widget_text.h"
#include "widget_icon.h"
#include "widget_bar.h"
#include "drv.h"
#include "drv_generic_text.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
typedef struct {
int val1;
int val2;
DIRECTION dir;
int segment;
int invalid;
} BAR;
typedef struct {
int val1;
int val2;
DIRECTION dir;
int used;
int ascii;
} SEGMENT;
static char *Section=NULL;
static char *Driver=NULL;
int DROWS = 20; /* display size: rows */
int DCOLS = 4; /* display size: columns */
int LROWS = 20; /* layout size: rows */
int LCOLS = 4; /* layout 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 */
int GOTO_COST = 0; /* number of bytes a goto command requires */
int INVALIDATE = 0; /* re-send a modified userdefined char? */
static char *LayoutFB = NULL;
static char *DisplayFB = NULL;
static int Single_Segments = 0;
static int nSegment = 0;
static int fSegment = 0;
static SEGMENT Segment[128];
static BAR *BarFB = NULL;
/****************************************/
/*** generic Framebuffer stuff ***/
/****************************************/
static void drv_generic_text_resizeFB (int rows, int cols)
{
char *newFB;
BAR *newBar;
int i, row, col;
/* Layout FB is large enough */
if (rows <= LROWS && cols <= LCOLS)
return;
/* get maximum values */
if (rows < LROWS) rows = LROWS;
if (cols < LCOLS) cols = LCOLS;
/* allocate new Layout FB */
newFB = malloc(cols * rows * sizeof(char));
memset (newFB, ' ', rows * cols * sizeof(char));
/* transfer contents */
if (LayoutFB != NULL) {
for (row = 0; row < LROWS; row++) {
for (col = 0; col < LCOLS; col++) {
newFB[row * cols + col] = LayoutFB[row * LCOLS + col];
}
}
free (LayoutFB);
}
LayoutFB = newFB;
/* resize Bar buffer */
if (BarFB) {
newBar = malloc (rows * cols * sizeof(BAR));
for (i = 0; i < rows * cols; i++) {
newBar[i].val1 = -1;
newBar[i].val2 = -1;
newBar[i].dir = 0;
newBar[i].segment = -1;
newBar[i].invalid = 0;
}
/* transfer contents */
for (row = 0; row < LROWS; row++) {
for (col = 0; col < LCOLS; col++) {
newBar[row * cols + col] = BarFB[row * LCOLS + col];
}
}
free (BarFB);
BarFB = newBar;
}
LCOLS = cols;
LROWS = rows;
}
/****************************************/
/*** generic text handling ***/
/****************************************/
int drv_generic_text_init (const char *section, const char *driver)
{
Section = (char*)section;
Driver = (char*)driver;
/* init display framebuffer */
DisplayFB = (char*)malloc(DCOLS * DROWS * sizeof(char));
memset (DisplayFB, ' ', DROWS * DCOLS * sizeof(char));
/* init layout framebuffer */
LROWS = 0;
LCOLS = 0;
LayoutFB = NULL;
drv_generic_text_resizeFB (DROWS, DCOLS);
/* sanity check */
if (LayoutFB == NULL || DisplayFB == NULL) {
error ("%s: framebuffer could not be allocated: malloc() failed", Driver);
return -1;
}
return 0;
}
/* say hello to the user */
int drv_generic_text_greet (const char *msg1, const char *msg2)
{
int i;
int flag = 0;
char *line1[] = { "* LCD4Linux " VERSION " *",
"LCD4Linux " VERSION,
"* LCD4Linux *",
"LCD4Linux",
"L4Linux",
NULL };
char *line2[] = { "http://lcd4linux.bulix.org",
"lcd4linux.bulix.org",
NULL };
for (i = 0; line1[i]; i++) {
if (strlen(line1[i]) <= (unsigned)DCOLS) {
drv_generic_text_real_write (0, (DCOLS - strlen(line1[i])) / 2, line1[i], strlen(line1[i]));
flag = 1;
break;
}
}
if (DROWS >= 2) {
for (i = 0; line2[i]; i++) {
if (strlen(line2[i]) <= (unsigned)DCOLS) {
drv_generic_text_real_write (1, (DCOLS - strlen(line2[i])) / 2, line2[i], strlen(line2[i]));
flag = 1;
break;
}
}
}
if (msg1 && DROWS >= 3) {
int len = strlen(msg1);
if ( len <= DCOLS) {
drv_generic_text_real_write (2, (DCOLS-len) / 2, msg1, len);
flag = 1;
}
}
if (msg2 && DROWS >= 4) {
int len = strlen(msg2);
if ( len <= DCOLS) {
drv_generic_text_real_write (3, (DCOLS-len) / 2, msg2, len);
flag = 1;
}
}
return flag;
}
int drv_generic_text_draw (WIDGET *W)
{
WIDGET_TEXT *Text = W->data;
char *txt, *fb1, *fb2;
int row, col, col0, len, end;
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);
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);
drv_generic_text_real_write (row, col0, fb2+pos1, pos2-pos1+1);
}
}
return 0;
}
int drv_generic_text_quit (void) {
if (LayoutFB) {
free(LayoutFB);
LayoutFB = NULL;
}
if (DisplayFB) {
free(DisplayFB);
DisplayFB = NULL;
}
if (BarFB) {
free (BarFB);
BarFB = NULL;
}
widget_unregister();
return (0);
}
/****************************************/
/*** generic icon handling ***/
/****************************************/
int drv_generic_text_icon_init (void)
{
if (cfg_number(Section, "Icons", 0, 0, CHARS, &ICONS) < 0) return -1;
if (ICONS>0) {
info ("%s: reserving %d of %d user-defined characters for icons", Driver, ICONS, CHARS);
}
return 0;
}
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;
row = W->row;
col = W->col;
/* maybe grow layout framebuffer */
drv_generic_text_resizeFB (row+1, col+1);
/* icon deactivated? */
if (Icon->ascii == -2) return 0;
/* ASCII already assigned? */
if (Icon->ascii == -1) {
if (icon_counter >= ICONS) {
error ("cannot process icon '%s': out of icons", W->name);
Icon->ascii = -2;
return -1;
}
icon_counter++;
Icon->ascii = CHAR0 + CHARS - icon_counter;
}
/* maybe redefine icon */
if (Icon->curmap != Icon->prvmap && Icon->visible) {
Icon->prvmap = Icon->curmap;
drv_generic_text_real_defchar(Icon->ascii, Icon->bitmap + YRES * Icon->curmap);
invalidate = INVALIDATE;
}
/* 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;
/* maybe send icon to the display */
if (row < DROWS && col < DCOLS && (DisplayFB[d_idx] != ascii || invalidate)) {
DisplayFB[d_idx] = ascii;
drv_generic_text_real_write (row, col, DisplayFB + d_idx, 1);
}
return 0;
}
/****************************************/
/*** generic bar handling ***/
/****************************************/
static void drv_generic_text_bar_clear(void)
{
int i;
for (i = 0; i < LROWS*LCOLS; i++) {
BarFB[i].val1 = -1;
BarFB[i].val2 = -1;
BarFB[i].dir = 0;
BarFB[i].segment = -1;
BarFB[i].invalid = 0;
}
for (i = 0; i < nSegment; i++) {
Segment[i].used = 0;
}
}
int drv_generic_text_bar_init (const int single_segments)
{
if (BarFB) free (BarFB);
if ((BarFB = malloc (LROWS * LCOLS * sizeof(BAR))) == NULL) {
error ("bar buffer allocation failed: out of memory");
return -1;
}
Single_Segments = single_segments;
nSegment = 0;
fSegment = 0;
drv_generic_text_bar_clear();
return 0;
}
void drv_generic_text_bar_add_segment(const int val1, const int val2, const DIRECTION dir, const int ascii)
{
Segment[fSegment].val1 = val1;
Segment[fSegment].val2 = val2;
Segment[fSegment].dir = dir;
Segment[fSegment].used = 0;
Segment[fSegment].ascii = ascii;
fSegment++;
nSegment = fSegment;
}
static void drv_generic_text_bar_create_bar (int row, int col, const DIRECTION dir, int len, int val1, int val2)
{
int rev = 0;
switch (dir) {
case DIR_WEST:
val1 = len-val1;
val2 = len-val2;
rev = 1;
case DIR_EAST:
while (len > 0 && col < LCOLS) {
BarFB[row*LCOLS+col].dir = dir;
BarFB[row*LCOLS+col].segment = -1;
if (val1 >= XRES) {
BarFB[row*LCOLS+col].val1 = rev ? 0 : XRES;
val1 -= XRES;
} else {
BarFB[row*LCOLS+col].val1 = rev ? XRES-val1 : val1;
val1 = 0;
}
if (val2 >= XRES) {
BarFB[row*LCOLS+col].val2 = rev ? 0 : XRES;
val2 -= XRES;
} else {
BarFB[row*LCOLS+col].val2 = rev ? XRES-val2 : val2;
val2 = 0;
}
len--;
col++;
}
break;
case DIR_SOUTH:
val1 = len-val1;
val2 = len-val2;
rev = 1;
case DIR_NORTH:
while (len > 0 && row < LROWS) {
BarFB[row*LCOLS+col].dir = dir;
BarFB[row*LCOLS+col].segment = -1;
if (val1 >= YRES) {
BarFB[row*LCOLS+col].val1 = rev ? 0 : YRES;
val1 -= YRES;
} else {
BarFB[row*LCOLS+col].val1 = rev ? YRES-val1 : val1;
val1 = 0;
}
if (val2 >= YRES) {
BarFB[row*LCOLS+col].val2 = rev ? 0 : YRES;
val2 -= YRES;
} else {
BarFB[row*LCOLS+col].val2 = rev ? YRES - val2 : val2;
val2 = 0;
}
len--;
row++;
}
break;
}
}
static void drv_generic_text_bar_create_segments (void)
{
int i, j, n;
int res, l1, l2;
/* find first unused segment */
for (i = fSegment; i < nSegment && Segment[i].used; i++);
/* pack unused segments */
for (j = i+1; j < nSegment; j++) {
if (Segment[j].used)
Segment[i++] = Segment[j];
}
nSegment = i;
/* create needed segments */
for (n = 0; n < LROWS*LCOLS; n++) {
if (BarFB[n].dir == 0) continue;
res = BarFB[n].dir & (DIR_EAST|DIR_WEST) ? XRES:YRES;
for (i = 0; i < nSegment; i++) {
if (Segment[i].dir & BarFB[n].dir) {
l1 = Segment[i].val1; if (l1 > res) l1=res;
l2 = Segment[i].val2; if (l2 > res) l2=res;
if (l1 == BarFB[n].val1 && l2 == BarFB[n].val2) break;
}
}
if (i == nSegment) {
nSegment++;
Segment[i].val1 = BarFB[n].val1;
Segment[i].val2 = BarFB[n].val2;
Segment[i].dir = BarFB[n].dir;
Segment[i].used = 0;
Segment[i].ascii = -1;
}
BarFB[n].segment = i;
}
}
static int drv_generic_text_bar_segment_error (const int i, const int j)
{
int res;
int i1, i2, j1, j2;
if (i == j) return 65535;
if (!(Segment[i].dir & Segment[j].dir)) return 65535;
res = Segment[i].dir&(DIR_EAST|DIR_WEST) ? XRES:YRES;
i1 = Segment[i].val1; if (i1 > res) i1 = res;
i2 = Segment[i].val2; if (i2 > res) i2 = res;
j1 = Segment[j].val1; if (j1 > res) j1 = res;
j2 = Segment[j].val2; if (j2 > res) j2 = res;
if (i1 == 0 && j1 != 0) return 65535;
if (i2 == 0 && j2 != 0) return 65535;
if (i1 == res && j1 < res) return 65535;
if (i2 == res && j2 < res) return 65535;
if (i1 == 1 && j1 != 1 && i2 > 0) return 65535;
if (i2 == 1 && j2 != 1 && j1 > 0) return 65535;
if (i1 == i2 && j1 != j2) return 65535;
return (i1-j1)*(i1-j1) + (i2-j2)*(i2-j2);
}
static void drv_generic_text_bar_pack_segments (void)
{
int i, j, n, min;
int pack_i, pack_j;
int pass1 = 1;
int error[nSegment][nSegment];
if (nSegment <= fSegment + CHARS - ICONS) {
return;
}
for (i = 0; i < nSegment; i++) {
for (j = 0; j < nSegment; j++) {
error[i][j] = drv_generic_text_bar_segment_error(i, j);
}
}
while (nSegment > fSegment + CHARS - ICONS) {
min = 65535;
pack_i = -1;
pack_j = -1;
for (i = fSegment; i < nSegment; i++) {
if (pass1 && Segment[i].used) continue;
for (j = 0; j < nSegment; j++) {
if (error[i][j] < min) {
min = error[i][j];
pack_i = i;
pack_j = j;
}
}
}
if (pack_i == -1) {
if (pass1) {
pass1 = 0;
continue;
} else {
error ("unable to compact bar characters");
error ("nSegment=%d fSegment=%d CHARS=%d ICONS=%d", nSegment, fSegment, CHARS, ICONS);
error ("Segment[0].val1=%d val2=%d", Segment[0].val1, Segment[0].val2);
error ("Segment[1].val1=%d val2=%d", Segment[1].val1, Segment[1].val2);
error ("Segment[2].val1=%d val2=%d", Segment[2].val1, Segment[2].val2);
nSegment = CHARS - ICONS;
break;
}
}
#if 0
debug ("pack_segment: n=%d i=%d j=%d min=%d", nSegment, pack_i, pack_j, min);
debug ("Pack_segment: i1=%d i2=%d j1=%d j2=%d\n",
Segment[pack_i].val1, Segment[pack_i].val2,
Segment[pack_j].val1, Segment[pack_j].val2);
#endif
nSegment--;
Segment[pack_i] = Segment[nSegment];
for (i = 0; i < nSegment; i++) {
error[pack_i][i] = error[nSegment][i];
error[i][pack_i] = error[i][nSegment];
}
for (n = 0; n < LROWS * LCOLS; n++) {
if (BarFB[n].segment == pack_i) BarFB[n].segment = pack_j;
if (BarFB[n].segment == nSegment) BarFB[n].segment = pack_i;
}
}
}
static void drv_generic_text_bar_define_chars(void)
{
int c, i, j;
unsigned char buffer[8];
for (i = fSegment; i < nSegment; i++) {
if (Segment[i].used) continue;
if (Segment[i].ascii != -1) continue;
for (c = 0; c < CHARS - ICONS; c++) {
for (j = fSegment; j < nSegment; j++) {
if (Segment[j].ascii == c) break;
}
if (j == nSegment) break;
}
Segment[i].ascii = c;
switch (Segment[i].dir) {
case DIR_WEST:
for (j = 0; j < 4; j++) {
buffer[j ] = (1<<Segment[i].val1)-1;
buffer[j+4] = (1<<Segment[i].val2)-1;
}
break;
case DIR_EAST:
for (j = 0; j < 4; j++) {
buffer[j ] = 255<<(XRES-Segment[i].val1);
buffer[j+4] = 255<<(XRES-Segment[i].val2);
}
break;
case DIR_NORTH:
for (j = 0; j < Segment[i].val1; j++) {
buffer[7-j] = (1<<XRES)-1;
}
for (; j < YRES; j++) {
buffer[7-j] = 0;
}
break;
case DIR_SOUTH:
for (j = 0; j < Segment[i].val1; j++) {
buffer[j] = (1<<XRES)-1;
}
for (; j < YRES; j++) {
buffer[j] = 0;
}
break;
}
drv_generic_text_real_defchar(CHAR0+c, buffer);
/* maybe invalidate framebuffer */
if (INVALIDATE) {
for (j = 0; j < LROWS*LCOLS; j++) {
if (BarFB[j].segment == i) {
BarFB[j].invalid = 1;
}
}
}
}
}
int drv_generic_text_bar_draw (WIDGET *W)
{
WIDGET_BAR *Bar = W->data;
int row, col, col0, len, res, max, val1, val2;
int c, n, s;
DIRECTION dir;
row = W->row;
col = W->col;
dir = Bar->direction;
len = Bar->length;
/* maybe grow layout framebuffer */
/* bars *always* grow heading North or East! */
if (dir & (DIR_EAST|DIR_WEST)) {
drv_generic_text_resizeFB (row+1, col+len);
} else {
drv_generic_text_resizeFB (row+1, col+1);
}
res = dir & (DIR_EAST|DIR_WEST) ? XRES : YRES;
max = len * res;
val1 = Bar->val1 * (double)(max);
val2 = Bar->val2 * (double)(max);
if (val1 < 1) val1 = 1;
else if (val1 > max) val1 = max;
if (val2 < 1) val2 = 1;
else if (val2 > max) val2 = max;
if (Single_Segments) val2 = val1;
/* create this bar */
drv_generic_text_bar_create_bar (row, col, dir, len, val1, val2);
/* process all bars */
drv_generic_text_bar_create_segments ();
drv_generic_text_bar_pack_segments ();
drv_generic_text_bar_define_chars();
/* reset usage flags */
for (s = 0; s < nSegment; s++) {
Segment[s].used = 0;
}
/* set usage flags */
for (n = 0; n < LROWS*LCOLS; n++) {
if ((s = BarFB[n].segment) != -1) Segment[s].used = 1;
}
/* transfer bars into layout buffer */
for (row = 0; row < LROWS; row++) {
for (col = 0; col < LCOLS; col++) {
n = row*LCOLS+col;
s = BarFB[n].segment;
if (s == -1) continue;
c = Segment[s].ascii;
if (c == -1) continue;
if (s >= fSegment) c += CHAR0; /* ascii offset for user-defineable chars */
LayoutFB[n] = c;
/* maybe invalidate display framebuffer */
if (BarFB[n].invalid) {
BarFB[n].invalid = 0;
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);
drv_generic_text_real_write (row, col0, DisplayFB+row*DCOLS+pos1, pos2-pos1+1);
}
}
return 0;
}