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Cleanup and more extensive explanation of why we don't use hardware feature

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This commit is contained in:
dglaude
2002-03-04 17:52:44 +00:00
parent a4089c644f
commit 25fc33ec5c
1 changed files with 34 additions and 38 deletions
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server/drivers/MtxOrb.c
+34 -38
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@@ -71,12 +71,30 @@
#define IS_VFD_DISPLAY (p->MtxOrb_type == MTXORB_VFD)
#define IS_VKD_DISPLAY (p->MtxOrb_type == MTXORB_VKD)
/*
NOTE: This does not appear to make use of the
hbar and vbar functions present in the LKD202-25.
Why I do not know.
RESP: Because software emulated hbar/vbar permit simultaneous use.
*/
/*
* The MtxOrb driver do not use a lot of hardware feature.
* We try to replace them by more flexible software version.
* That's why vbar/hbar/bignum are using Matrix Orbital build-in function.
* It permit simultanious use of those features and custom char.
*
* The same way we don't use the hardware clear but empty the frame buffer.
* The frame buffer hold all the change that are requested,
* until the server ask us to flush that to display.
* This also permit to do incremental update and reduce the number of
* character to be send to the display accross the serial link.
*
* In order to display graphic widget we use and define our own custom char.
* To avoid multiple definition of the same custom character,
* we use a caching mechanisme that remember what is currently define.
* In order to avoid always redefining the same custom character
* wich are at the begining of the table, we rotate the begining of the table.
* This is suppose to reduce the number of caracter redefinition
* and make the caching more effective. All in all we reduce the number
* of caracter we need to send to the display.
*
* David GLAUDE
*/
/* TODO: Find a better way to deal with the bitmap/name of custom char
* Here the value link to the enum and the definition at the end.
@@ -227,8 +245,6 @@ static char MtxOrb_parse_keypad_setting (Driver *drvthis, char * keyname, char d
MODULE_EXPORT int
MtxOrb_init (Driver *drvthis, char *args)
{
/* Start of command line parsing*/
struct termios portset;
int contrast = DEFAULT_CONTRAST;
@@ -449,12 +465,10 @@ MtxOrb_init (Driver *drvthis, char *args)
#define ValidX(x) if ((x) > p->width) { (x) = p->width; } else (x) = (x) < 1 ? 1 : (x);
#define ValidY(y) if ((y) > p->height) { (y) = p->height; } else (y) = (y) < 1 ? 1 : (y);
/*
* Clear: catch up when the screen get clear to be able to
* forget bar caracter not in use anymore and reuse the
* slot for another bar caracter.
*/
/******************************
* Clear the screen (the frame buffer)
*/
MODULE_EXPORT void
MtxOrb_clear (Driver *drvthis)
{
@@ -462,11 +476,7 @@ MtxOrb_clear (Driver *drvthis)
if (p->framebuf != NULL)
memset (p->framebuf, ' ', (p->widthBYheight));
/* We don't use hardware clear anymore.
* We use incremental update with the frame_buffer. */
/* write(fd, "\x0FE" "X", 2); */ /* instant clear... */
p->clear = 1;
p->clear = 1; /* Remember that custom char are no more visible. */
debug(RPT_DEBUG, "MtxOrb: cleared screen");
}
@@ -512,6 +522,9 @@ MtxOrb_height (Driver *drvthis)
return p->height;
}
/******************************
* Display a string at x,y
*/
MODULE_EXPORT void
MtxOrb_string (Driver *drvthis, int x, int y, char *string)
{
@@ -532,6 +545,9 @@ MtxOrb_string (Driver *drvthis, int x, int y, char *string)
debug(RPT_DEBUG, "MtxOrb: printed string at (%d,%d)", x, y);
}
/******************************
* Send what we have to the hardware
*/
MODULE_EXPORT void
MtxOrb_flush (Driver *drvthis)
{
@@ -550,15 +566,6 @@ MtxOrb_flush (Driver *drvthis)
strncpy(p->old, p->framebuf, p->widthBYheight);
return;
} else {
/* CODE TEMPORARY DISABLED (joris)
UNSURE IF IT STILL WORKS NOW
David GLAUDE: It seems to work...
But I did not try to understand...
if (! new_framebuf(drvthis, old))
return;
*/
}
xp = p->framebuf;
@@ -588,13 +595,6 @@ MtxOrb_flush (Driver *drvthis)
}
/* for (i = 0; i < height; i++) {
* snprintf (out, sizeof(out), "\x0FEG\x001%c", i + 1);
* write (fd, out, 4);
* write (fd, framebuf + (width * i), width);
* }
*/
strncpy(p->old, p->framebuf, p->widthBYheight);
debug(RPT_DEBUG, "MtxOrb: frame buffer flushed");
@@ -1119,10 +1119,6 @@ MtxOrb_num (Driver *drvthis, int pos, int val)
debug(RPT_DEBUG, "MtxOrb: write big number %d at %d", val, pos);
/* We don't use hardware bignum anymore, so we remove those. */
/* snprintf (out, sizeof(out), "\x0FE#%c%c", x, num); */
/* write (fd, out, 4); */
/* Currently we are bignum but if bigalpha is there remove this line */
c=val+'0'; /* We transform from 0-9 to 'O' to '9' */