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1bit and 2bit LCD drivers: Low-level bit handling optimisations.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10225 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2006-07-18 00:04:43 +00:00
parent ed00b17305
commit 393f31cc43
5 changed files with 76 additions and 32 deletions
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39
firmware/drivers/lcd-2bit-horz.c
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@ -197,24 +197,29 @@ static void bgblock(unsigned char *address, unsigned mask, unsigned bits)
ICODE_ATTR;
static void bgblock(unsigned char *address, unsigned mask, unsigned bits)
{
mask &= ~bits;
*address = (*address & ~mask) | (bg_pattern & mask);
unsigned data = *address;
*address = data ^ ((data ^ bg_pattern) & mask & ~bits);
}
static void fgblock(unsigned char *address, unsigned mask, unsigned bits)
ICODE_ATTR;
static void fgblock(unsigned char *address, unsigned mask, unsigned bits)
{
mask &= bits;
*address = (*address & ~mask) | (fg_pattern & mask);
unsigned data = *address;
*address = data ^ ((data ^ fg_pattern) & mask & bits);
}
static void solidblock(unsigned char *address, unsigned mask, unsigned bits)
ICODE_ATTR;
static void solidblock(unsigned char *address, unsigned mask, unsigned bits)
{
*address = (*address & ~mask) | (bits & mask & fg_pattern)
| (~bits & mask & bg_pattern);
unsigned data = *address;
unsigned bgp = bg_pattern;
bits = bgp ^ ((bgp ^ fg_pattern) & bits);
*address = data ^ ((data ^ bits) & mask);
}
static void flipinvblock(unsigned char *address, unsigned mask, unsigned bits)
@ -228,24 +233,29 @@ static void bginvblock(unsigned char *address, unsigned mask, unsigned bits)
ICODE_ATTR;
static void bginvblock(unsigned char *address, unsigned mask, unsigned bits)
{
mask &= bits;
*address = (*address & ~mask) | (bg_pattern & mask);
unsigned data = *address;
*address = data ^ ((data ^ bg_pattern) & mask & bits);
}
static void fginvblock(unsigned char *address, unsigned mask, unsigned bits)
ICODE_ATTR;
static void fginvblock(unsigned char *address, unsigned mask, unsigned bits)
{
mask &= ~bits;
*address = (*address & ~mask) | (fg_pattern & mask);
unsigned data = *address;
*address = data ^ ((data ^ fg_pattern) & mask & ~bits);
}
static void solidinvblock(unsigned char *address, unsigned mask, unsigned bits)
ICODE_ATTR;
static void solidinvblock(unsigned char *address, unsigned mask, unsigned bits)
{
*address = (*address & ~mask) | (~bits & mask & fg_pattern)
| (bits & mask & bg_pattern);
unsigned data = *address;
unsigned fgp = fg_pattern;
bits = fgp ^ ((fgp ^ bg_pattern) & bits);
*address = data ^ ((data ^ bits) & mask);
}
lcd_blockfunc_type* const lcd_blockfuncs[8] = {
@ -255,7 +265,10 @@ lcd_blockfunc_type* const lcd_blockfuncs[8] = {
static inline void setblock(unsigned char *address, unsigned mask, unsigned bits)
{
*address = (*address & ~mask) | (bits & mask);
unsigned data = *address;
bits ^= data;
*address = data ^ (bits & mask);
}
/*** drawing functions ***/