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2xsai.cpp
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/**********************************************************************************
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
(c) Copyright 1996 - 2002 Gary Henderson ([email protected]),
Jerremy Koot ([email protected])
(c) Copyright 2002 - 2004 Matthew Kendora
(c) Copyright 2002 - 2005 Peter Bortas ([email protected])
(c) Copyright 2004 - 2005 Joel Yliluoma (http://iki.fi/bisqwit/)
(c) Copyright 2001 - 2006 John Weidman ([email protected])
(c) Copyright 2002 - 2006 funkyass ([email protected]),
Kris Bleakley ([email protected])
(c) Copyright 2002 - 2007 Brad Jorsch ([email protected]),
Nach ([email protected]),
zones ([email protected])
(c) Copyright 2006 - 2007 nitsuja
BS-X C emulator code
(c) Copyright 2005 - 2006 Dreamer Nom,
zones
C4 x86 assembler and some C emulation code
(c) Copyright 2000 - 2003 _Demo_ ([email protected]),
Nach,
zsKnight ([email protected])
C4 C++ code
(c) Copyright 2003 - 2006 Brad Jorsch,
Nach
DSP-1 emulator code
(c) Copyright 1998 - 2006 _Demo_,
Andreas Naive ([email protected])
Gary Henderson,
Ivar ([email protected]),
John Weidman,
Kris Bleakley,
Matthew Kendora,
Nach,
neviksti ([email protected])
DSP-2 emulator code
(c) Copyright 2003 John Weidman,
Kris Bleakley,
Lord Nightmare ([email protected]),
Matthew Kendora,
neviksti
DSP-3 emulator code
(c) Copyright 2003 - 2006 John Weidman,
Kris Bleakley,
Lancer,
z80 gaiden
DSP-4 emulator code
(c) Copyright 2004 - 2006 Dreamer Nom,
John Weidman,
Kris Bleakley,
Nach,
z80 gaiden
OBC1 emulator code
(c) Copyright 2001 - 2004 zsKnight,
pagefault ([email protected]),
Kris Bleakley,
Ported from x86 assembler to C by sanmaiwashi
SPC7110 and RTC C++ emulator code
(c) Copyright 2002 Matthew Kendora with research by
zsKnight,
John Weidman,
Dark Force
S-DD1 C emulator code
(c) Copyright 2003 Brad Jorsch with research by
Andreas Naive,
John Weidman
S-RTC C emulator code
(c) Copyright 2001-2006 byuu,
John Weidman
ST010 C++ emulator code
(c) Copyright 2003 Feather,
John Weidman,
Kris Bleakley,
Matthew Kendora
Super FX x86 assembler emulator code
(c) Copyright 1998 - 2003 _Demo_,
pagefault,
zsKnight,
Super FX C emulator code
(c) Copyright 1997 - 1999 Ivar,
Gary Henderson,
John Weidman
Sound DSP emulator code is derived from SNEeSe and OpenSPC:
(c) Copyright 1998 - 2003 Brad Martin
(c) Copyright 1998 - 2006 Charles Bilyue'
SH assembler code partly based on x86 assembler code
(c) Copyright 2002 - 2004 Marcus Comstedt ([email protected])
2xSaI filter
(c) Copyright 1999 - 2001 Derek Liauw Kie Fa
HQ2x, HQ3x, HQ4x filters
(c) Copyright 2003 Maxim Stepin ([email protected])
Win32 GUI code
(c) Copyright 2003 - 2006 blip,
funkyass,
Matthew Kendora,
Nach,
nitsuja
Mac OS GUI code
(c) Copyright 1998 - 2001 John Stiles
(c) Copyright 2001 - 2007 zones
Specific ports contains the works of other authors. See headers in
individual files.
Snes9x homepage: http://www.snes9x.com
Permission to use, copy, modify and/or distribute Snes9x in both binary
and source form, for non-commercial purposes, is hereby granted without
fee, providing that this license information and copyright notice appear
with all copies and any derived work.
This software is provided 'as-is', without any express or implied
warranty. In no event shall the authors be held liable for any damages
arising from the use of this software or it's derivatives.
Snes9x is freeware for PERSONAL USE only. Commercial users should
seek permission of the copyright holders first. Commercial use includes,
but is not limited to, charging money for Snes9x or software derived from
Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
using Snes9x as a promotion for your commercial product.
The copyright holders request that bug fixes and improvements to the code
should be forwarded to them so everyone can benefit from the modifications
in future versions.
Super NES and Super Nintendo Entertainment System are trademarks of
Nintendo Co., Limited and its subsidiary companies.
**********************************************************************************/
#ifdef __DJGPP
#include <allegro.h>
#endif
#include "snes9x.h"
#include "port.h"
#include "gfx.h"
#if (defined(USE_X86_ASM) && (defined (__i386__) || defined (__i486__) || \
defined (__i586__) || defined (WIN32) || defined (__DJGPP)))
# ifndef MMX
# define MMX
# endif
#endif
extern "C"
{
#ifdef MMX
void _2xSaILine (uint8 *srcPtr, uint8 *deltaPtr, uint32 srcPitch,
uint32 width, uint8 *dstPtr, uint32 dstPitch);
void _2xSaISuperEagleLine (uint8 *srcPtr, uint8 *deltaPtr,
uint32 srcPitch, uint32 width,
uint8 *dstPtr, uint32 dstPitch);
void _2xSaISuper2xSaILine (uint8 *srcPtr, uint8 *deltaPtr,
uint32 srcPitch, uint32 width,
uint8 *dstPtr, uint32 dstPitch);
void Init_2xSaIMMX (uint32 BitFormat);
void BilinearMMX (uint16 * A, uint16 * B, uint16 * C, uint16 * D,
uint16 * dx, uint16 * dy, uint8 *dP);
void BilinearMMXGrid0 (uint16 * A, uint16 * B, uint16 * C, uint16 * D,
uint16 * dx, uint16 * dy, uint8 *dP);
void BilinearMMXGrid1 (uint16 * A, uint16 * B, uint16 * C, uint16 * D,
uint16 * dx, uint16 * dy, uint8 *dP);
void EndMMX ();
#endif
}
bool8 cpu_mmx = 1;
static uint32 colorMask = 0xF7DEF7DE;
static uint32 lowPixelMask = 0x08210821;
static uint32 qcolorMask = 0xE79CE79C;
static uint32 qlowpixelMask = 0x18631863;
static uint32 redblueMask = 0xF81F;
static uint32 greenMask = 0x7E0;
int Init_2xSaI (uint32 BitFormat)
{
if (BitFormat == 565)
{
colorMask = 0xF7DEF7DE;
lowPixelMask = 0x08210821;
qcolorMask = 0xE79CE79C;
qlowpixelMask = 0x18631863;
redblueMask = 0xF81F;
greenMask = 0x7E0;
}
else if (BitFormat == 555)
{
colorMask = 0x7BDE7BDE;
lowPixelMask = 0x04210421;
qcolorMask = 0x739C739C;
qlowpixelMask = 0x0C630C63;
redblueMask = 0x7C1F;
greenMask = 0x3E0;
}
else
{
return 0;
}
#ifdef MMX
Init_2xSaIMMX (BitFormat);
#endif
return 1;
}
static inline int GetResult1 (uint32 A, uint32 B, uint32 C, uint32 D,
uint32 /* E */)
{
int x = 0;
int y = 0;
int r = 0;
if (A == C)
x += 1;
else if (B == C)
y += 1;
if (A == D)
x += 1;
else if (B == D)
y += 1;
if (x <= 1)
r += 1;
if (y <= 1)
r -= 1;
return r;
}
static inline int GetResult2 (uint32 A, uint32 B, uint32 C, uint32 D,
uint32 /* E */)
{
int x = 0;
int y = 0;
int r = 0;
if (A == C)
x += 1;
else if (B == C)
y += 1;
if (A == D)
x += 1;
else if (B == D)
y += 1;
if (x <= 1)
r -= 1;
if (y <= 1)
r += 1;
return r;
}
static inline int GetResult (uint32 A, uint32 B, uint32 C, uint32 D)
{
int x = 0;
int y = 0;
int r = 0;
if (A == C)
x += 1;
else if (B == C)
y += 1;
if (A == D)
x += 1;
else if (B == D)
y += 1;
if (x <= 1)
r += 1;
if (y <= 1)
r -= 1;
return r;
}
static inline uint32 INTERPOLATE (uint32 A, uint32 B)
{
if (A != B)
{
return (((A & colorMask) >> 1) + ((B & colorMask) >> 1) +
(A & B & lowPixelMask));
}
else
return A;
}
static inline uint32 Q_INTERPOLATE (uint32 A, uint32 B, uint32 C, uint32 D)
{
register uint32 x = ((A & qcolorMask) >> 2) +
((B & qcolorMask) >> 2) +
((C & qcolorMask) >> 2) + ((D & qcolorMask) >> 2);
register uint32 y = (A & qlowpixelMask) +
(B & qlowpixelMask) + (C & qlowpixelMask) + (D & qlowpixelMask);
y = (y >> 2) & qlowpixelMask;
return x + y;
}
#define BLUE_MASK565 0x001F001F
#define RED_MASK565 0xF800F800
#define GREEN_MASK565 0x07E007E0
#define BLUE_MASK555 0x001F001F
#define RED_MASK555 0x7C007C00
#define GREEN_MASK555 0x03E003E0
void Super2xSaI (uint8 *srcPtr, uint32 srcPitch,
uint8 *deltaPtr, uint8 *dstPtr, uint32 dstPitch,
int width, int height)
{
uint16 *bP;
uint8 *dP;
uint32 inc_bP;
#ifdef MMX
if (cpu_mmx)
{
while (height--)
{
_2xSaISuper2xSaILine (srcPtr, deltaPtr, srcPitch, width,
dstPtr, dstPitch);
srcPtr += srcPitch;
dstPtr += dstPitch * 2;
deltaPtr += srcPitch;
}
}
else
#endif
{
uint32 Nextline = srcPitch >> 1;
inc_bP = 1;
while (height--)
{
bP = (uint16 *) srcPtr;
dP = (uint8 *) dstPtr;
for (uint32 finish = width; finish; finish -= inc_bP)
{
uint32 color4, color5, color6;
uint32 color1, color2, color3;
uint32 colorA0, colorA1, colorA2, colorA3,
colorB0, colorB1, colorB2, colorB3, colorS1, colorS2;
uint32 product1a, product1b, product2a, product2b;
//--------------------------------------- B1 B2
// 4 5 6 S2
// 1 2 3 S1
// A1 A2
colorB0 = *(bP - Nextline - 1);
colorB1 = *(bP - Nextline);
colorB2 = *(bP - Nextline + 1);
colorB3 = *(bP - Nextline + 2);
color4 = *(bP - 1);
color5 = *(bP);
color6 = *(bP + 1);
colorS2 = *(bP + 2);
color1 = *(bP + Nextline - 1);
color2 = *(bP + Nextline);
color3 = *(bP + Nextline + 1);
colorS1 = *(bP + Nextline + 2);
colorA0 = *(bP + Nextline + Nextline - 1);
colorA1 = *(bP + Nextline + Nextline);
colorA2 = *(bP + Nextline + Nextline + 1);
colorA3 = *(bP + Nextline + Nextline + 2);
//--------------------------------------
if (color2 == color6 && color5 != color3)
{
product2b = product1b = color2;
}
else if (color5 == color3 && color2 != color6)
{
product2b = product1b = color5;
}
else if (color5 == color3 && color2 == color6)
{
register int r = 0;
r += GetResult (color6, color5, color1, colorA1);
r += GetResult (color6, color5, color4, colorB1);
r += GetResult (color6, color5, colorA2, colorS1);
r += GetResult (color6, color5, colorB2, colorS2);
if (r > 0)
product2b = product1b = color6;
else if (r < 0)
product2b = product1b = color5;
else
{
product2b = product1b = INTERPOLATE (color5, color6);
}
}
else
{
if (color6 == color3 && color3 == colorA1
&& color2 != colorA2 && color3 != colorA0)
product2b =
Q_INTERPOLATE (color3, color3, color3, color2);
else if (color5 == color2 && color2 == colorA2
&& colorA1 != color3 && color2 != colorA3)
product2b =
Q_INTERPOLATE (color2, color2, color2, color3);
else
product2b = INTERPOLATE (color2, color3);
if (color6 == color3 && color6 == colorB1
&& color5 != colorB2 && color6 != colorB0)
product1b =
Q_INTERPOLATE (color6, color6, color6, color5);
else if (color5 == color2 && color5 == colorB2
&& colorB1 != color6 && color5 != colorB3)
product1b =
Q_INTERPOLATE (color6, color5, color5, color5);
else
product1b = INTERPOLATE (color5, color6);
}
if (color5 == color3 && color2 != color6 && color4 == color5
&& color5 != colorA2)
product2a = INTERPOLATE (color2, color5);
else
if (color5 == color1 && color6 == color5
&& color4 != color2 && color5 != colorA0)
product2a = INTERPOLATE (color2, color5);
else
product2a = color2;
if (color2 == color6 && color5 != color3 && color1 == color2
&& color2 != colorB2)
product1a = INTERPOLATE (color2, color5);
else
if (color4 == color2 && color3 == color2
&& color1 != color5 && color2 != colorB0)
product1a = INTERPOLATE (color2, color5);
else
product1a = color5;
#ifdef MSB_FIRST
product1a = product1b | (product1a << 16);
product2a = product2b | (product2a << 16);
#else
product1a = product1a | (product1b << 16);
product2a = product2a | (product2b << 16);
#endif
*((uint32 *) dP) = product1a;
*((uint32 *) (dP + dstPitch)) = product2a;
bP += inc_bP;
dP += sizeof (uint32);
} // end of for ( finish= width etc..)
srcPtr += srcPitch;
dstPtr += dstPitch * 2;
deltaPtr += srcPitch;
} // while (height--)
}
}
void SuperEagle (uint8 *srcPtr, uint32 srcPitch, uint8 *deltaPtr,
uint8 *dstPtr, uint32 dstPitch, int width, int height)
{
uint8 *dP;
uint16 *bP;
uint16 *xP;
uint32 inc_bP;
#ifdef MMX
if (cpu_mmx)
{
while (height--)
{
_2xSaISuperEagleLine (srcPtr, deltaPtr, srcPitch, width,
dstPtr, dstPitch);
srcPtr += srcPitch;
dstPtr += dstPitch * 2;
deltaPtr += srcPitch;
}
}
else
#endif
{
inc_bP = 1;
uint32 Nextline = srcPitch >> 1;
while (height--)
{
bP = (uint16 *) srcPtr;
xP = (uint16 *) deltaPtr;
dP = dstPtr;
for (uint32 finish = width; finish; finish -= inc_bP)
{
uint32 color4, color5, color6;
uint32 color1, color2, color3;
uint32 colorA1, colorA2, colorB1, colorB2, colorS1, colorS2;
uint32 product1a, product1b, product2a, product2b;
colorB1 = *(bP - Nextline);
colorB2 = *(bP - Nextline + 1);
color4 = *(bP - 1);
color5 = *(bP);
color6 = *(bP + 1);
colorS2 = *(bP + 2);
color1 = *(bP + Nextline - 1);
color2 = *(bP + Nextline);
color3 = *(bP + Nextline + 1);
colorS1 = *(bP + Nextline + 2);
colorA1 = *(bP + Nextline + Nextline);
colorA2 = *(bP + Nextline + Nextline + 1);
// --------------------------------------
if (color2 == color6 && color5 != color3)
{
product1b = product2a = color2;
if ((color1 == color2) || (color6 == colorB2))
{
product1a = INTERPOLATE (color2, color5);
product1a = INTERPOLATE (color2, product1a);
// product1a = color2;
}
else
{
product1a = INTERPOLATE (color5, color6);
}
if ((color6 == colorS2) || (color2 == colorA1))
{
product2b = INTERPOLATE (color2, color3);
product2b = INTERPOLATE (color2, product2b);
// product2b = color2;
}
else
{
product2b = INTERPOLATE (color2, color3);
}
}
else if (color5 == color3 && color2 != color6)
{
product2b = product1a = color5;
if ((colorB1 == color5) || (color3 == colorS1))
{
product1b = INTERPOLATE (color5, color6);
product1b = INTERPOLATE (color5, product1b);
// product1b = color5;
}
else
{
product1b = INTERPOLATE (color5, color6);
}
if ((color3 == colorA2) || (color4 == color5))
{
product2a = INTERPOLATE (color5, color2);
product2a = INTERPOLATE (color5, product2a);
// product2a = color5;
}
else
{
product2a = INTERPOLATE (color2, color3);
}
}
else if (color5 == color3 && color2 == color6)
{
register int r = 0;
r += GetResult (color6, color5, color1, colorA1);
r += GetResult (color6, color5, color4, colorB1);
r += GetResult (color6, color5, colorA2, colorS1);
r += GetResult (color6, color5, colorB2, colorS2);
if (r > 0)
{
product1b = product2a = color2;
product1a = product2b = INTERPOLATE (color5, color6);
}
else if (r < 0)
{
product2b = product1a = color5;
product1b = product2a = INTERPOLATE (color5, color6);
}
else
{
product2b = product1a = color5;
product1b = product2a = color2;
}
}
else
{
product2b = product1a = INTERPOLATE (color2, color6);
product2b =
Q_INTERPOLATE (color3, color3, color3, product2b);
product1a =
Q_INTERPOLATE (color5, color5, color5, product1a);
product2a = product1b = INTERPOLATE (color5, color3);
product2a =
Q_INTERPOLATE (color2, color2, color2, product2a);
product1b =
Q_INTERPOLATE (color6, color6, color6, product1b);
// product1a = color5;
// product1b = color6;
// product2a = color2;
// product2b = color3;
}
#ifdef MSB_FIRST
product1a = product1b | (product1a << 16);
product2a = product2b | (product2a << 16);
#else
product1a = product1a | (product1b << 16);
product2a = product2a | (product2b << 16);
#endif
*((uint32 *) dP) = product1a;
*((uint32 *) (dP + dstPitch)) = product2a;
*xP = color5;
bP += inc_bP;
xP += inc_bP;
dP += sizeof (uint32);
} // end of for ( finish= width etc..)
srcPtr += srcPitch;
dstPtr += dstPitch * 2;
deltaPtr += srcPitch;
} // endof: while (height--)
}
}
void _2xSaI (uint8 *srcPtr, uint32 srcPitch, uint8 *deltaPtr,
uint8 *dstPtr, uint32 dstPitch, int width, int height)
{
uint8 *dP;
uint16 *bP;
uint32 inc_bP;
#ifdef MMX
if (cpu_mmx)
{
while (height--)
{
_2xSaILine (srcPtr, deltaPtr, srcPitch, width, dstPtr, dstPitch);
srcPtr += srcPitch;
dstPtr += dstPitch * 2;
deltaPtr += srcPitch;
}
}
else
#endif
{
inc_bP = 1;
uint32 Nextline = srcPitch >> 1;
while (height--)
{
bP = (uint16 *) srcPtr;
dP = dstPtr;
for (uint32 finish = width; finish; finish -= inc_bP)
{
register uint32 colorA, colorB;
uint32 colorC, colorD,
colorE, colorF, colorG, colorH,
colorI, colorJ, colorK, colorL,
colorM, colorN, colorO, colorP;
uint32 product, product1, product2;
//---------------------------------------
// Map of the pixels: I|E F|J
// G|A B|K
// H|C D|L
// M|N O|P
colorI = *(bP - Nextline - 1);
colorE = *(bP - Nextline);
colorF = *(bP - Nextline + 1);
colorJ = *(bP - Nextline + 2);
colorG = *(bP - 1);
colorA = *(bP);
colorB = *(bP + 1);
colorK = *(bP + 2);
colorH = *(bP + Nextline - 1);
colorC = *(bP + Nextline);
colorD = *(bP + Nextline + 1);
colorL = *(bP + Nextline + 2);
colorM = *(bP + Nextline + Nextline - 1);
colorN = *(bP + Nextline + Nextline);
colorO = *(bP + Nextline + Nextline + 1);
colorP = *(bP + Nextline + Nextline + 2);
if ((colorA == colorD) && (colorB != colorC))
{
if (((colorA == colorE) && (colorB == colorL)) ||
((colorA == colorC) && (colorA == colorF)
&& (colorB != colorE) && (colorB == colorJ)))
{
product = colorA;
}
else
{
product = INTERPOLATE (colorA, colorB);
}
if (((colorA == colorG) && (colorC == colorO)) ||
((colorA == colorB) && (colorA == colorH)
&& (colorG != colorC) && (colorC == colorM)))
{
product1 = colorA;
}
else
{
product1 = INTERPOLATE (colorA, colorC);
}
product2 = colorA;
}
else if ((colorB == colorC) && (colorA != colorD))
{
if (((colorB == colorF) && (colorA == colorH)) ||
((colorB == colorE) && (colorB == colorD)
&& (colorA != colorF) && (colorA == colorI)))
{
product = colorB;
}
else
{
product = INTERPOLATE (colorA, colorB);
}
if (((colorC == colorH) && (colorA == colorF)) ||
((colorC == colorG) && (colorC == colorD)
&& (colorA != colorH) && (colorA == colorI)))
{
product1 = colorC;
}
else
{
product1 = INTERPOLATE (colorA, colorC);
}
product2 = colorB;
}
else if ((colorA == colorD) && (colorB == colorC))
{
if (colorA == colorB)
{
product = colorA;
product1 = colorA;
product2 = colorA;
}
else
{
register int r = 0;
product1 = INTERPOLATE (colorA, colorC);
product = INTERPOLATE (colorA, colorB);
r +=
GetResult1 (colorA, colorB, colorG, colorE,
colorI);
r +=
GetResult2 (colorB, colorA, colorK, colorF,
colorJ);
r +=
GetResult2 (colorB, colorA, colorH, colorN,
colorM);
r +=
GetResult1 (colorA, colorB, colorL, colorO,
colorP);
if (r > 0)
product2 = colorA;
else if (r < 0)
product2 = colorB;
else
{
product2 =
Q_INTERPOLATE (colorA, colorB, colorC,
colorD);
}
}
}
else
{
product2 = Q_INTERPOLATE (colorA, colorB, colorC, colorD);
if ((colorA == colorC) && (colorA == colorF)
&& (colorB != colorE) && (colorB == colorJ))
{
product = colorA;
}
else
if ((colorB == colorE) && (colorB == colorD)
&& (colorA != colorF) && (colorA == colorI))
{
product = colorB;
}
else
{
product = INTERPOLATE (colorA, colorB);
}
if ((colorA == colorB) && (colorA == colorH)
&& (colorG != colorC) && (colorC == colorM))
{
product1 = colorA;
}
else
if ((colorC == colorG) && (colorC == colorD)
&& (colorA != colorH) && (colorA == colorI))
{
product1 = colorC;
}
else
{
product1 = INTERPOLATE (colorA, colorC);
}
}
#ifdef MSB_FIRST
product = product | (colorA << 16);
product1 = product2 | (product1 << 16);
#else
product = colorA | (product << 16);
product1 = product1 | (product2 << 16);
#endif
*((int32 *) dP) = product;
*((uint32 *) (dP + dstPitch)) = product1;
bP += inc_bP;
dP += sizeof (uint32);
} // end of for ( finish= width etc..)
srcPtr += srcPitch;
dstPtr += dstPitch * 2;
deltaPtr += srcPitch;
} // endof: while (height--)
}
}
#ifdef MMX
void Scale_2xSaI (uint8 *srcPtr, uint32 srcPitch, uint8 * /* deltaPtr */,
uint8 *dstPtr, uint32 dstPitch,
uint32 dstWidth, uint32 dstHeight, int width, int height)
{
uint8 *dP;
uint16 *bP;
uint32 w;
uint32 h;
uint32 dw;
uint32 dh;
uint32 hfinish;
uint32 wfinish;
uint32 Nextline;
uint16 colorA[4];
uint16 colorB[4];
uint16 colorC[4];
uint16 colorD[4];
uint16 dx[4];
uint16 dy[4];
Nextline = srcPitch >> 1;
wfinish = (width - 1) << 16; // convert to fixed point
hfinish = (height - 1) << 16; // convert to fixed point
dw = wfinish / (dstWidth - 1);
dh = hfinish / (dstHeight - 1);
for (h = 0; h < hfinish; h += dh)
{
uint32 y1, y2;
y1 = h & 0xffff; // fraction part of fixed point
y2 = 0x10000 - y1;
bP = (uint16 *) (srcPtr + ((h >> 16) * srcPitch));
dP = dstPtr;
for (w = 0; w < wfinish;)
{
uint32 A, B, C, D;
uint32 E, F, G, H;
uint32 I, J, K, L;
uint32 x1, x2, a1, f1, f2;
uint32 position;
for (int c = 0; c < 4; c++)
{
position = w >> 16;
A = bP[position]; // current pixel
B = bP[position + 1]; // next pixel
C = bP[position + Nextline];
D = bP[position + Nextline + 1];
E = bP[position - Nextline];
F = bP[position - Nextline + 1];
G = bP[position - 1];
H = bP[position + Nextline - 1];
I = bP[position + 2];
J = bP[position + Nextline + 2];
K = bP[position + Nextline + Nextline];
L = bP[position + Nextline + Nextline + 1];
x1 = w & 0xffff; // fraction part of fixed point
x2 = 0x10000 - x1;
/*1*/
if (A == D && B != C)
{
f1 = (x1 >> 1) + (0x10000 >> 2);
f2 = (y1 >> 1) + (0x10000 >> 2);
if (y1 <= f1 && A == J && A != E) // close to B
{
a1 = f1 - y1;
colorA[c] = A;
colorB[c] = B;
colorC[c] = 0;
colorD[c] = 0;
dx[c] = a1;
dy[c] = 0;
}
else if (y1 >= f1 && A == G && A != L) // close to C
{
a1 = y1 - f1;
colorA[c] = A;
colorB[c] = C;
colorC[c] = 0;
colorD[c] = 0;
dx[c] = a1;
dy[c] = 0;
}
else if (x1 >= f2 && A == E && A != J) // close to B
{
a1 = x1 - f2;
colorA[c] = A;
colorB[c] = B;
colorC[c] = 0;
colorD[c] = 0;
dx[c] = a1;
dy[c] = 0;
}
else if (x1 <= f2 && A == L && A != G) // close to C
{
a1 = f2 - x1;
colorA[c] = A;
colorB[c] = C;
colorC[c] = 0;
colorD[c] = 0;
dx[c] = a1;
dy[c] = 0;
}
else if (y1 >= x1) // close to C