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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.
@
@ $URL$
@ $Id$
@
@ @author Robin Watts (robin@wss.co.uk)
.text
.global _blitLandscapeScreenRect16bpp
.global _blitLandscapeScreenRect8bpp
_blitLandscapeScreenRect16bpp:
@ r0 = dst
@ r1 = src
@ r2 = w
@ r3 = h
@ <> = _screenWidth
@ <> = _screenHeight
MOV r12,r13
STMFD r13!,{r4-r11,r14}
LDMFD r12,{r12,r14} @ r12 = _screenWidth
@ r14 = _screenHeight
ADD r14,r14,r3 @ r14 = _screenHeight + h
MVN r11,#0
MLA r11,r3,r12,r11 @ r11= _screenWidth*h-1
ADD r12,r12,r12
xloop:
SUBS r4,r3,#5 @ r4 = y = h
BLE thin
yloop:
LDRH r5, [r1],r12 @ r5 = *src src += _screenWidth
LDRH r6, [r1],r12 @ r6 = *src src += _screenWidth
LDRH r7, [r1],r12 @ r7 = *src src += _screenWidth
LDRH r8, [r1],r12 @ r8 = *src src += _screenWidth
LDRH r9, [r1],r12 @ r9 = *src src += _screenWidth
LDRH r10,[r1],r12 @ r10= *src src += _screenWidth
SUBS r4,r4,#6
STRH r5, [r0],#2 @ *dst++ = r5
STRH r6, [r0],#2 @ *dst++ = r6
STRH r7, [r0],#2 @ *dst++ = r7
STRH r8, [r0],#2 @ *dst++ = r8
STRH r9, [r0],#2 @ *dst++ = r9
STRH r10,[r0],#2 @ *dst++ = r10
BGT yloop
thin:
ADDS r4,r4,#5
BEQ lineend
thin_loop:
LDRH r5,[r1],r12 @ r5 = *src src += _screenWidth
SUBS r4,r4,#1
STRH r5,[r0],#2 @ *dst++ = r5
BGT thin_loop
lineend:
SUB r0,r0,r14,LSL #1 @ dst -= _screenHeight + h
SUB r1,r1,r11,LSL #1 @ src += 1-_screenWidth*h
SUBS r2,r2,#1
BGT xloop
LDMFD r13!,{r4-r11,PC}
_blitLandscapeScreenRect8bpp:
@ r0 = dst
@ r1 = src
@ r2 = w
@ r3 = h
@ <> = _palette
@ <> = _screenWidth
@ <> = _screenHeight
MOV r12,r13
STMFD r13!,{r4-r11,r14}
LDMFD r12,{r11,r12,r14} @ r11 = _palette
@ r12 = _screenWidth
@ r14 = _screenHeight
ADD r14,r14,r3 @ r14 = _screenHeight + h
MVN r6,#0
MLA r6,r3,r12,r6 @ r6 = _screenWidth*h-1
xloop8:
MOV r4,r3 @ r4 = y = h
SUBS r4,r3,#4 @ r4 = y = h
BLE thin8
yloop8:
LDRB r5, [r1],r12 @ r5 = *src src += _screenWidth
LDRB r7, [r1],r12 @ r7 = *src src += _screenWidth
LDRB r8, [r1],r12 @ r8 = *src src += _screenWidth
LDRB r9, [r1],r12 @ r9 = *src src += _screenWidth
LDRB r10,[r1],r12 @ r10= *src src += _screenWidth
ADD r5, r5, r5
ADD r7, r7, r7
ADD r8, r8, r8
ADD r9, r9, r9
ADD r10,r10,r10
LDRH r5, [r11,r5]
LDRH r7, [r11,r7]
LDRH r8, [r11,r8]
LDRH r9, [r11,r9]
LDRH r10,[r11,r10]
SUBS r4,r4,#5
STRH r5, [r0],#2 @ *dst++ = r5
STRH r7, [r0],#2 @ *dst++ = r7
STRH r8, [r0],#2 @ *dst++ = r8
STRH r9, [r0],#2 @ *dst++ = r9
STRH r10,[r0],#2 @ *dst++ = r10
BGT yloop8
thin8:
ADDS r4,r4,#4
BEQ lineend8
thin_loop8:
LDRB r5,[r1],r12 @ r5 = *src src += _screenWidth
ADD r5,r5,r5
LDRH r5,[r11,r5]
SUBS r4,r4,#1
STRH r5,[r0],#2 @ *dst++ = r5
BGT thin_loop8
lineend8:
SUB r0,r0,r14,LSL #1 @ dst -= _screenHeight + h
SUB r1,r1,r6 @ src += 1-_screenWidth*h
SUBS r2,r2,#1
BGT xloop8
LDMFD r13!,{r4-r11,PC}
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