From 5068d08ebb7ba029d1cdbc3eb121bf4945f89d86 Mon Sep 17 00:00:00 2001
From: Oystein Eftevaag
Date: Wed, 5 Dec 2007 08:03:47 +0000
Subject: ARM ASM blitting routines from Robin_Watts

svn-id: r29717
---
 backends/platform/iphone/blit_arm.s | 140 ++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 backends/platform/iphone/blit_arm.s

(limited to 'backends/platform/iphone/blit_arm.s')

diff --git a/backends/platform/iphone/blit_arm.s b/backends/platform/iphone/blit_arm.s
new file mode 100644
index 0000000000..ae31fdcce4
--- /dev/null
+++ b/backends/platform/iphone/blit_arm.s
@@ -0,0 +1,140 @@
+@ 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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