devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

Patch #5432 from Thomas Paul Diffenbach - small speedup for ipod video lcd_update function.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10252 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman 2006-07-19 17:47:06 +00:00
parent 73c6c9d279
commit 61c301bf8d
1 changed files with 13 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

19
firmware/drivers/lcd-ipodvideo.c
View file

@ -172,12 +172,19 @@ void lcd_update_rect(int x, int y, int width, int height)
unsigned short *end = &src[LCD_WIDTH * height];
int line_rem = (LCD_WIDTH - width);
while (src < end) {
/* for each column */
unsigned short *end_line = src + width;
while (src < end_line) {
/* write out two pixels */
outw(*(src++), 0x30000000);
outw(*(src++), 0x30000000);
/* Duff's Device to unroll loop */
register int count = width ;
register int n=( count + 7 ) / 8;
switch( count % 8 ) {
case 0: do{ outw(*(src++), 0x30000000);
case 7: outw(*(src++), 0x30000000);
case 6: outw(*(src++), 0x30000000);
case 5: outw(*(src++), 0x30000000);
case 4: outw(*(src++), 0x30000000);
case 3: outw(*(src++), 0x30000000);
case 2: outw(*(src++), 0x30000000);
case 1: outw(*(src++), 0x30000000);
} while(--n>0);
}
src += line_rem;
}