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Two tiny optimisations for mono bitmap drawing on greyscale displays: (1) H1x0, M5: Manipulate destination masks directly for the aligned case - ~0.7% speedup. (2) Greyscale ipods: Use sentinel method for reloading data like the 16 bit driver does - ~1.5% speedup.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21139 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2009-05-30 23:35:44 +00:00
parent 294ece8bd6
commit 72061047d1
2 changed files with 17 additions and 16 deletions
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8
firmware/drivers/lcd-2bit-horz.c
View file

@ -732,8 +732,7 @@ void ICODE_ATTR lcd_mono_bitmap_part(const unsigned char *src, int src_x,
do
{
const unsigned char *src_col = src++;
unsigned data = *src_col >> src_y;
int numbits = 8 - ((int)src_y);
unsigned data = (*src_col | 0x100) >> src_y; /* bit 8 == sentinel */
ymax = y + height;
ny = y;
@ -747,11 +746,10 @@ void ICODE_ATTR lcd_mono_bitmap_part(const unsigned char *src, int src_x,
ny++;
data >>= 1;
if (--numbits == 0)
if (data == 0x001)
{
src_col += stride;
data = *src_col;
numbits = 8;
data = *src_col | 0x100;
}
}
while (ny < ymax);

23
firmware/drivers/lcd-2bit-vert.c
View file

@ -719,7 +719,6 @@ void ICODE_ATTR lcd_mono_bitmap_part(const unsigned char *src, int src_x,
{
int shift, ny;
fb_data *dst, *dst_end;
unsigned mask, mask_bottom;
lcd_blockfunc_type *bfunc;
/* nothing to draw? */
@ -757,20 +756,21 @@ void ICODE_ATTR lcd_mono_bitmap_part(const unsigned char *src, int src_x,
ny = height - 1 + shift + src_y;
bfunc = lcd_blockfuncs[current_vp->drawmode];
mask = 0xFFu << (shift + src_y);
mask_bottom = 0xFFu >> (~ny & 7);
if (shift == 0)
{
unsigned dmask1, dmask2, data;
unsigned dmask1, dmask2, dmask_bottom, data;
dmask1 = 0xFFFFu << (2 * (shift + src_y));
dmask2 = dmask1 >> 8;
dmask1 &= 0xFFu;
dmask_bottom = 0xFFFFu >> (2 * (~ny & 7));
for (; ny >= 8; ny -= 8)
{
const unsigned char *src_row = src;
fb_data *dst_row = dst + LCD_WIDTH;
dmask1 = lcd_dibits[mask&0x0F];
dmask2 = lcd_dibits[(mask>>4)&0x0F];
dst_end = dst_row + width;
if (dmask1 != 0)
@ -791,11 +791,11 @@ void ICODE_ATTR lcd_mono_bitmap_part(const unsigned char *src, int src_x,
}
src += stride;
dst += 2*LCD_WIDTH;
mask = 0xFFu;
dmask1 = dmask2 = 0xFFu;
}
mask &= mask_bottom;
dmask1 = lcd_dibits[mask&0x0F];
dmask2 = lcd_dibits[(mask>>4)&0x0F];
dmask1 &= dmask_bottom;
/* & 0xFFu is unnecessary here - dmask1 can't exceed that*/
dmask2 &= (dmask_bottom >> 8);
dst_end = dst + width;
if (dmask1 != 0)
@ -826,6 +826,9 @@ void ICODE_ATTR lcd_mono_bitmap_part(const unsigned char *src, int src_x,
}
else
{
unsigned mask = 0xFFu << (shift + src_y);
unsigned mask_bottom = 0xFFu >> (~ny & 7);
dst_end = dst + width;
do
{