mangavalk/lcdproc
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optimize flush()

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This commit is contained in:
marschap
2006-11-26 18:35:30 +00:00
parent 2843e65f8e
commit f6e3027102
1 changed files with 68 additions and 48 deletions
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server/drivers/MtxOrb.c
+67 -47
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@@ -401,28 +401,6 @@ MtxOrb_init (Driver *drvthis)
} }
/**
* Clear the screen.
* \param drvthis Pointer to driver structure.
*/
MODULE_EXPORT void
MtxOrb_clear (Driver *drvthis)
{
PrivateData *p = drvthis->private_data;
/* set hbar/vbar/bignum mode back to normal character display */
p->ccmode = standard;
/* replace all chars in framebuf with spaces */
memset(p->framebuf, ' ', (p->width * p->height));
/* make backing store differ from framebuf so it all gets cleared by MtxOrb_flush */
memset(p->backingstore, 0xFE, (p->width * p->height));
debug(RPT_DEBUG, "MtxOrb: cleared screen");
}
/** /**
* Close the driver (do necessary clean-up). * Close the driver (do necessary clean-up).
* \param drvthis Pointer to driver structure. * \param drvthis Pointer to driver structure.
@@ -538,6 +516,28 @@ MtxOrb_string (Driver *drvthis, int x, int y, char string[])
} }
/**
* Clear the screen.
* \param drvthis Pointer to driver structure.
*/
MODULE_EXPORT void
MtxOrb_clear (Driver *drvthis)
{
PrivateData *p = drvthis->private_data;
/* set hbar/vbar/bignum mode back to normal character display */
p->ccmode = standard;
/* replace all chars in framebuf with spaces */
memset(p->framebuf, ' ', (p->width * p->height));
/* make backing store differ from framebuf so it all gets cleared by MtxOrb_flush */
//memset(p->backingstore, 0xFE, (p->width * p->height));
debug(RPT_DEBUG, "MtxOrb: cleared screen");
}
/** /**
* Flush data on screen to the LCD. * Flush data on screen to the LCD.
* \param drvthis Pointer to driver structure. * \param drvthis Pointer to driver structure.
@@ -546,38 +546,58 @@ MODULE_EXPORT void
MtxOrb_flush (Driver *drvthis) MtxOrb_flush (Driver *drvthis)
{ {
PrivateData *p = drvthis->private_data; PrivateData *p = drvthis->private_data;
unsigned char *xp = p->framebuf; int modified = 0;
unsigned char *xq = p->backingstore; int i, j;
int i;
/* Note: this implementation is not optimal as it does 1 write per char */ for (i = 0; i < p->height; i++) {
for (i = 1; i <= p->height; i++) { // set pointers to start of the line in frame buffer & backing store
int j; unsigned char *sp = p->framebuf + (i * p->width);
int move = 1; /* need to move to the 1st char of each line */ unsigned char *sq = p->backingstore + (i * p->width);
for (j = 1; j <= p->width; j++) { debug(RPT_DEBUG, "Framebuf: '%.*s'", p->width, sp);
debug(RPT_DEBUG, "Backingstore: '%.*s'", p->width, sq);
if (*xp == *xq) /* Strategy:
move++; /* skip a char => need to move cursor */ * - not more than one update command per line
else { * - leave out leading and trailing parts that are identical
/* Draw characters that have changed */ */
/* don't send the command character to the display */ // set pointers to end of the line in frame buffer & backing store
unsigned char c = (*xp == 0xFE) ? ' ': *xp; unsigned char *ep = sp + (p->width - 1);
unsigned char *eq = sq + (p->width - 1);
int length = 0;
if (move != 0) { // skip over leading identical portions of the line
MtxOrb_cursor_goto(drvthis, j, i); for (j = 0; (sp <= ep) && (*sp == *sq); sp++, sq++, j++)
move = 0; ;
}
write(p->fd, &c, 1); // skip over trailing identical portions of the line
} for (length = p->width - j; (length > 0) && (*ep == *eq); ep--, eq--, length--)
xp++; ;
xq++;
/* there are differences, ... */
if (length > 0) {
unsigned char out[length+2];
unsigned char *byte;
memcpy(out, sp, length);
// replace command character \xFE by space
while ((byte = memchr(out, '\xFE', length)) != NULL)
*byte = ' ';
debug(RPT_DEBUG, "%s: l=%d c=%d count=%d string='%.*s'",
__FUNCTION__, i, j, length, length, sp);
MtxOrb_cursor_goto(drvthis, j+1, i+1);
write(p->fd, out, length);
modified++;
} }
} } // i < p->height
memcpy(p->backingstore, p->framebuf, p->width * p->height);
debug(RPT_DEBUG, "MtxOrb: frame buffer flushed"); if (modified)
memcpy(p->backingstore, p->framebuf, p->width * p->height);
debug(RPT_DEBUG, "MtxOrb: framebuffer flushed");
} }