6058e0cdb7
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16539 a1c6a512-1295-4272-9138-f99709370657
128 lines
3.2 KiB
ArmAsm
128 lines
3.2 KiB
ArmAsm
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* New greyscale framework
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* Coldfire assembler routines
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*
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* This is a generic framework to display 129 shades of grey on low-depth
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* bitmap LCDs (Archos b&w, Iriver & Ipod 4-grey) within plugins.
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*
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* Copyright (C) 2008 Jens Arnold
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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/* Plugins should not normally do this, but we need to check a macro, and
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* plugin.h would confuse the assembler. */
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.text
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.global _grey_line1
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.type _grey_line1, @function
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#if (LCD_PIXELFORMAT == VERTICAL_PACKING) && (LCD_DEPTH == 2)
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/****************************************************************************
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* void _grey_line1(int width,
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* unsigned char *dst,
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* const unsigned char *src,
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* const unsigned char *lut);
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*/
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_grey_line1:
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lea.l (-2*4, %sp), %sp
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movem.l %d2/%a2, (%sp)
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movem.l (2*4+4, %sp), %d2/%a0-%a2
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clr.l %d0
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move.l %a1, %d1
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and.l #1, %d1
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beq.s .p1_h_end
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move.b (%a1)+, %d0
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move.b (%d0.l, %a2), (%a0)
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addq.l #4, %a0
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subq.l #1, %d2
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.p1_h_end:
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cmp.l #2, %d2
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blo.s .p2_t_end
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move.l %a1, %d1
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and.l #2, %d1
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beq.s .p2_h_end
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move.w (%a1)+, %d1
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move.w %d1, %d0
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lsr.l #8, %d0
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move.b (%d0.l, %a2), (%a0)
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addq.l #4, %a0
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move.b %d1, %d0
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move.b (%d0.l, %a2), (%a0)
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addq.l #4, %a0
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subq.l #2, %d2
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.p2_h_end:
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subq.l #4, %d2
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blo.s .p4_end
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.p4_loop:
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move.l (%a1)+, %d1
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swap %d1
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move.w %d1, %d0
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lsr.l #8, %d0
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move.b (%d0.l, %a2), (%a0)
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addq.l #4, %a0
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move.b %d1, %d0
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move.b (%d0.l, %a2), (%a0)
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addq.l #4, %a0
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swap %d1
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move.w %d1, %d0
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lsr.l #8, %d0
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move.b (%d0.l, %a2), (%a0)
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addq.l #4, %a0
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move.b %d1, %d0
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move.b (%d0.l, %a2), (%a0)
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addq.l #4, %a0
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subq.l #4, %d2
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bhs.s .p4_loop
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/* No need to correct the count, we're only testing bits from now on. */
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.p4_end:
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btst.l #1, %d2
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beq.s .p2_t_end
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move.w (%a1)+, %d1
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move.w %d1, %d0
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lsr.l #8, %d0
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move.b (%d0.l, %a2), (%a0)
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addq.l #4, %a0
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move.b %d1, %d0
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move.b (%d0.l, %a2), (%a0)
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addq.l #4, %a0
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.p2_t_end:
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btst.l #0, %d2
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beq.s .p1_t_end
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move.b (%a1)+, %d0
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move.b (%d0.l, %a2), (%a0)
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.p1_t_end:
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movem.l (%sp), %d2/%a2
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lea.l (2*4, %sp), %sp
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rts
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.size _grey_line1, . - _grey_line1
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#endif
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