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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* New greyscale framework
* SH1 assembler routines
*
* This is a generic framework to display 129 shades of grey on low-depth
* bitmap LCDs (Archos b&w, Iriver & Ipod 4-grey) within plugins.
*
* Copyright (C) 2008 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.
*
****************************************************************************/
#include "config.h"
/* Plugins should not normally do this, but we need to check a macro, and
* plugin.h would confuse the assembler. */
.text
.global __grey_line1
.type __grey_line1, @function
#if (LCD_PIXELFORMAT == VERTICAL_PACKING) && (LCD_DEPTH == 1)
/****************************************************************************
* void _grey_line1(int width, r4
* unsigned char *dst, r5
* const unsigned char *src, r6
* const unsigned char *lut); r7
*/
__grey_line1:
mov #1, r0
tst r0, r6
bt .p1_h_end
mov.b @r6+, r0
extu.b r0, r0
mov.b @(r0, r7), r0
add #-1, r4
mov.b r0, @r5
add #8, r5
.p1_h_end:
mov #2, r0
cmp/hs r0, r4
bf .p2_t_end
tst r0, r6
bt .p2_h_end
mov.w @r6+, r1
extu.b r1, r0
mov.b @(r0, r7), r0
shlr8 r1
mov.b r0, @(8, r5)
extu.b r1, r0
mov.b @(r0, r7), r0
add #-2, r4
mov.b r0, @r5
add #16, r5
.p2_h_end:
add #-4, r4
cmp/pz r4
bf .p4_end
add r6, r4
.p4_loop:
mov.l @r6+, r1
swap.w r1, r2
extu.b r2, r0
mov.b @(r0, r7), r0
shlr8 r2
mov.b r0, @(8, r5)
extu.b r2, r0
mov.b @(r0, r7), r2
extu.b r1, r0
mov.b r2, @r5
add #16, r5
mov.b @(r0, r7), r0
shlr8 r1
mov.b r0, @(8, r5)
extu.b r1, r0
mov.b @(r0, r7), r0
cmp/hs r6, r4
mov.b r0, @r5
add #16, r5
bt .p4_loop
/* No need to correct the count, we're only testing bits from now on. */
.p4_end:
mov #2, r0
tst r0, r4
bt .p2_t_end
mov.w @r6+, r1
extu.b r1, r0
mov.b @(r0, r7), r0
shlr8 r1
mov.b r0, @(8, r5)
extu.b r1, r0
mov.b @(r0, r7), r0
mov.b r0, @r5
add #16, r5
.p2_t_end:
mov #1, r0
tst r0, r4
bt .p1_t_end
mov.b @r6+, r0
extu.b r0, r0
mov.b @(r0, r7), r0
rts
mov.b r0, @r5
.p1_t_end:
rts
nop
.size _grey_line1, . - _grey_line1
#endif
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