diff options
| -rw-r--r-- | firmware/drivers/lcd-ipodvideo.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/firmware/drivers/lcd-ipodvideo.c b/firmware/drivers/lcd-ipodvideo.c index 84b8303..b94ab0b 100644 --- a/firmware/drivers/lcd-ipodvideo.c +++ b/firmware/drivers/lcd-ipodvideo.c @@ -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; } |