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| author | Dave Chapman <dave@dchapman.com> | 2006-07-19 17:47:06 +0000 |
|---|---|---|
| committer | Dave Chapman <dave@dchapman.com> | 2006-07-19 17:47:06 +0000 |
| commit | 61c301bf8d7606e7cd693f6b66b9657462a3a6b4 (patch) | |
| tree | 512eb2b76b6a4474e3a5ac3f766ee579f0887d99 | |
| parent | 73c6c9d279c7f2c0e12710ad692bbfbc3a846c95 (diff) | |
| download | rockbox-61c301bf8d7606e7cd693f6b66b9657462a3a6b4.zip rockbox-61c301bf8d7606e7cd693f6b66b9657462a3a6b4.tar.gz rockbox-61c301bf8d7606e7cd693f6b66b9657462a3a6b4.tar.bz2 rockbox-61c301bf8d7606e7cd693f6b66b9657462a3a6b4.tar.xz | |
Patch #5432 from Thomas Paul Diffenbach - small speedup for ipod video lcd_update function.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10252 a1c6a512-1295-4272-9138-f99709370657
| -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; } |