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@ ScummVM - Graphic Adventure Engine
@
@ ScummVM is the legal property of its developers, whose names
@ are too numerous to list here. Please refer to the COPYRIGHT
@ file distributed with this source distribution.
@
@ This program is free software@ you can redistribute it and/or
@ modify it under the terms of the GNU General Public License
@ as published by the Free Software Foundation@ either version 2
@ of the License, or (at your option) any later version.
@
@ This program is distributed in the hope that it will be useful,
@ but WITHOUT ANY WARRANTY@ without even the implied warranty of
@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
@ GNU General Public License for more details.
@
@ You should have received a copy of the GNU General Public License
@ along with this program@ if not, write to the Free Software
@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
@
@ @author Robin Watts (robin@wss.co.uk)
.text
.global Normal2xARM
@ Assumes dst is aligned (so did the C)
@ Assumes 16bit (so did the C)
.align 2
Normal2xARM:
@ r0 = src
@ r1 = srcPitch
@ r2 = dst
@ r3 = dstPitch
@ r4 = w
@ r5 = h
STMFD r13!,{r4-r11,r14}
LDR r4, [r13,#4*9] @ r4 = w
LDR r5, [r13,#4*10] @ r5 = h
ADD r12,r2, r3
SUB r1, r1, r4, LSL #1
SUB r6, r3, r4, LSL #2
ADD r3, r3, r6
yloop:
SUBS r14,r4, #4
ADDLT r14,r14, #4
BLT thin
xloop:
LDRH r6, [r0], #2
LDRH r7, [r0], #2
LDRH r8, [r0], #2
LDRH r9, [r0], #2
ORR r6, r6, r6, LSL #16
ORR r7, r7, r7, LSL #16
ORR r8, r8, r8, LSL #16
ORR r9, r9, r9, LSL #16
STMIA r2!, {r6-r9}
STMIA r12!,{r6-r9}
SUBS r14,r14,#4
BGE xloop
ADDS r14,r14,#4
BNE thin
ADD r0, r0, r1
ADD r2, r2, r3
ADD r12,r12,r3
SUBS r5, r5, #1
BGT yloop
LDMFD r13!,{r4-r11,PC}
thin:
LDRH r6, [r0], #2
ORR r6, r6, r6, LSL #16
STR r6, [r2], #4
STR r6, [r12],#4
SUBS r14,r14,#1
BGT thin
ADD r0, r0, r1
ADD r2, r2, r3
ADD r12,r12,r3
SUBS r5, r5, #1
BGT yloop
LDMFD r13!,{r4-r11,PC}
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