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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Grayscale framework
* gray_scroll_left() function
*
* This is a generic framework to use grayscale display within Rockbox
* plugins. It obviously does not work for the player.
*
* Copyright (C) 2004 Jens Arnold
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef SIMULATOR /* not for simulator by now */
#include "plugin.h"
#if CONFIG_LCD == LCD_SSD1815 /* only for Recorder/Ondio */
#include "gray.h"
/*---------------------------------------------------------------------------
Scroll the whole grayscale buffer left by <count> pixels
----------------------------------------------------------------------------
black_border determines if the pixels scrolled in at the right are black
or white
Scrolling left/right by an even pixel count is almost twice as fast as
scrolling by an odd pixel count.
*/
void gray_scroll_left(int count, bool black_border)
{
int by, d;
unsigned filler;
unsigned char *ptr;
if ((unsigned) count >= (unsigned) _graybuf->width)
return;
filler = black_border ? 0xFF : 0;
/* Scroll row by row to minimize flicker (byte rows = 8 pixels each) */
for (by = 0; by < _graybuf->bheight; by++)
{
ptr = _graybuf->data + MULU16(_graybuf->width, by);
for (d = 0; d < _graybuf->depth; d++)
{
asm volatile (
"mov %0,r1 \n" /* check if both source... */
"or %2,r1 \n" /* ...and offset are even */
"shlr r1 \n" /* -> lsb = 0 */
"bf .sl_start2 \n" /* -> copy word-wise */
"add #-1,%2 \n" /* copy byte-wise */
".sl_loop1: \n"
"mov.b @%0+,r1 \n"
"mov.b r1,@(%2,%0) \n"
"cmp/hi %0,%1 \n"
"bt .sl_loop1 \n"
"bra .sl_end \n"
"nop \n"
".sl_start2: \n" /* copy word-wise */
"add #-2,%2 \n"
".sl_loop2: \n"
"mov.w @%0+,r1 \n"
"mov.w r1,@(%2,%0) \n"
"cmp/hi %0,%1 \n"
"bt .sl_loop2 \n"
".sl_end: \n"
: /* outputs */
: /* inputs */
/* %0 */ "r"(ptr + count),
/* %1 */ "r"(ptr + _graybuf->width),
/* %2 */ "z"(-count)
: /* clobbers */
"r1"
);
_gray_rb->memset(ptr + _graybuf->width - count, filler, count);
ptr += _graybuf->plane_size;
}
}
}
#endif // #ifdef HAVE_LCD_BITMAP
#endif // #ifndef SIMULATOR
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