Add ARM code version of Normal2x scaler.

Add ARM only aspect ratio correcting version of Normal2x scaler.

Make WinCE port use Normal2x by default if the screen is large enough.
Make WinCE port use aspect ratio correcting version if panel is hidden.

svn-id: r42843

1 files changed, 171 insertions, 0 deletions

diff --git a/graphics/scaler/Normal2xARM.s b/graphics/scaler/Normal2xARM.s
new file mode 100755
index 0000000000..5de50d9c17
--- /dev/null
+++ b/graphics/scaler/Normal2xARM.s
@@ -0,0 +1,171 @@
+@ ScummVM Scumm Interpreter
+@ Copyright (C) 2009 The ScummVM project
+@
+@ 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 Normal2xARM
+        .global Normal2xAspectMask
+
+
+	@ Assumes dst is aligned (so did the C)
+	@ Assumes 16bit (so did the C)
+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
+	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}
+
+
+	@ Horrid filter calculations
+	@ AAAAAAAAAAAABBBBBBBBBBBBCCCCCCCCCCCCDDDDDDDDDDDDEEEEEEEEEEEE
+	@ <-+-><-+-><-+-><-+-><-+-><-+-><-+-><-+-><-+-><-+-><-+-><-+->
+	@ Ideal:  A,A,(A*2+B*3)/5,B,(B*4+C)/5,C,C,(C+D*4)/5,D,(D*3+E*2)/5,E,E
+	@ Actual: A,A,(A*3+B*5)/8,B,(B*7+C)/8,C,C,(C+D*7)/8,D,(D*5+E*3)/8,E,E
+
+	@ Assumes dst is aligned (so did the C)
+	@ Assumes 16bit (so did the C)
+Normal2xAspectMask:
+        @ r0 = src
+        @ r1 = srcPitch
+        @ r2 = dst
+        @ r3 = dstPitch
+        @ r4 = w
+        @ r5 = h
+	@ r12= mask
+        STMFD   r13!,{r4-r11,r14}
+        LDR     r4, [r13,#4*9]		@ r4 = w
+        LDR     r5, [r13,#4*10]		@ r5 = h
+	LDR	r12,[r13,#4*11]		@ r12= mask
+	MOV	r11,#2
+	SUB	r11,r11,r1, LSL #2	@ r11= 2-srcPitch*4
+	MOV	r14,#4
+	SUB	r14,r14,r3, LSL #3
+	SUB	r14,r14,r3, LSL #1
+	SUB	r14,r14,r3		@ r14 = 4-dstPitch*11
+yloop_aspect:
+xloop_aspect:
+	LDRH	r6, [r0], r1		@ r6 = A
+	LDRH	r7, [r0], r1            @ r7 = B
+	LDRH	r8, [r0], r1		@ r8 = C
+	LDRH	r9, [r0], r1		@ r9 = D
+	LDRH	r10,[r0], r11		@ r10= E
+	ORR	r6, r6, r6, LSL #16	@ r6 = output 0, 1
+	ORR	r7, r7, r7, LSL #16	@ r7 = output 3
+	ORR	r8, r8, r8, LSL #16	@ r8 = output 5,6
+	ORR	r9, r9, r9, LSL #16	@ r9 = output 8
+	ORR	r10,r10,r10,LSL #16	@ r10= output 10, 11
+	STR	r6, [r2], r3		@ output 0 (A)
+	STR	r6, [r2], r3		@ output 1 (A)
+	AND	r6, r6, r12		@ r6 = A split
+	ADD	r6, r6, r6, LSL #1	@ r6 = A*3
+	STR	r7, [r2, r3]		@ output 3 (B)
+	AND	r7, r7, r12		@ r7 = B split
+	ADD	r6, r6, r7		@ r6 = A*3 + B
+	ADD	r6, r6, r7, LSL #2	@ r6 = A*3 + B*5
+	AND	r6, r12,r6, LSR #3	@ r6 = (A*3 + B*5)>>3
+	ORR	r6, r6, r6, ROR #16	@ r6 = output 2
+	STR	r6, [r2], r3, LSL #1	@ output 2 (A*3+B*5)>>3
+	RSB	r7, r7, r7, LSL #3	@ r7 = B*7
+	AND	r6, r8, r12		@ r6 = C split
+	ADD	r7, r7, r6		@ r7 = B*7+C
+	AND	r7, r12,r7, LSR #3	@ r7 = (B*7 + C)>>3
+	ORR	r7, r7, r7, ROR #16	@ r7 = output 4
+	STR	r7, [r2], r3		@ output 4 (B*7+C)>>3
+	STR	r8, [r2], r3		@ output 5 (C)
+	STR	r8, [r2], r3		@ output 6 (C)
+	STR	r9, [r2, r3]		@ output 8 (D)
+	AND	r9, r9, r12		@ r9 = D split
+	RSB	r7, r9, r9, LSL #3	@ r7 = D*7
+	ADD	r6, r6, r7		@ r6 = C+D*7
+	AND	r6, r12,r6, LSR #3	@ r6 = (C + D*7)>>3
+	ORR	r6, r6, r6, ROR #16	@ r6 = output 7
+	STR	r6, [r2], r3, LSL #1	@ output 7 (C+D*7)>>3
+	ADD	r9, r9, r9, LSL #2	@ r9 = D*5
+	AND	r6, r10,r12		@ r6 = E split
+	ADD	r9, r9, r6		@ r9 = D*5+E
+	ADD	r9, r9, r6, LSL #1	@ r9 = D*5+E*3
+	AND	r9, r12,r9, LSR #3	@ r9 = (D*5 + E*3)>>3
+	ORR	r9, r9, r9, ROR #16	@ r9 = output 9
+	STR	r9, [r2], r3		@ output 9 (D*5+E*3)>>3
+	STR	r10,[r2], r3		@ output 10 (E)
+	STR	r10,[r2], r14		@ output 11 (E)
+	SUBS	r4, r4, #1
+	BGT	xloop_aspect
+        LDR     r4, [r13,#4*9]		@ r4 = w
+	ADD	r0, r0, r1, LSL #2
+	ADD	r0, r0, r1
+	SUB	r0, r0, r4, LSL #1
+	ADD	r2, r2, r3, LSL #3
+	ADD	r2, r2, r3, LSL #2
+	SUB	r2, r2, r4, LSL #2
+	SUBS	r5, r5, #5
+	BGT	yloop_aspect
+
+        LDMFD   r13!,{r4-r11,PC}