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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2003 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#ifndef COMMON_SCALER_INTERN_H
#define COMMON_SCALER_INTERN_H
#include "stdafx.h"
#include "common/scummsys.h"
#include "common/scaler.h"
#include "common/util.h"
// HACK HACK HACK
// Enable *experimental* AltiVec support.
// This will produce code crashing on any machine *without* Altivec
//
#define USE_ALTIVEC 0
template<int bitFormat>
struct ColorMasks {
};
template<>
struct ColorMasks<565> {
enum {
highBits = 0xF7DEF7DE,
lowBits = 0x08210821,
qhighBits = 0xE79CE79C,
qlowBits = 0x18631863,
redblueMask = 0xF81F,
greenMask = 0x07E0
};
};
template<>
struct ColorMasks<555> {
enum {
highBits = 0x7BDE7BDE,
lowBits = 0x04210421,
qhighBits = 0x739C739C,
qlowBits = 0x0C630C63,
redblueMask = 0x7C1F,
greenMask = 0x03E0
};
};
#define highBits ColorMasks<bitFormat>::highBits
#define lowBits ColorMasks<bitFormat>::lowBits
#define qhighBits ColorMasks<bitFormat>::qhighBits
#define qlowBits ColorMasks<bitFormat>::qlowBits
#define redblueMask ColorMasks<bitFormat>::redblueMask
#define greenMask ColorMasks<bitFormat>::greenMask
/**
* Interpolate two 16 bit pixel pairs at once with equal weights 1.
* In particular, A and B can contain two pixels/each in the upper
* and lower halves.
*/
template<int bitFormat>
static inline uint32 INTERPOLATE(uint32 A, uint32 B) {
return (((A & highBits) >> 1) + ((B & highBits) >> 1) + (A & B & lowBits));
}
/**
* Interpolate four 16 bit pixel pairs at once with equal weights 1.
* In particular, A and B can contain two pixels/each in the upper
* and lower halves.
*/
template<int bitFormat>
static inline uint32 Q_INTERPOLATE(uint32 A, uint32 B, uint32 C, uint32 D) {
register uint32 x = ((A & qhighBits) >> 2) + ((B & qhighBits) >> 2) + ((C & qhighBits) >> 2) + ((D & qhighBits) >> 2);
register uint32 y = ((A & qlowBits) + (B & qlowBits) + (C & qlowBits) + (D & qlowBits)) >> 2;
y &= qlowBits;
return x + y;
}
/**
* Interpolate two 16 bit pixels with the weights specified in the template
* parameters. Used by the hq scaler family.
*/
template<int bitFormat, int w1, int w2>
static inline uint16 interpolate16_2(uint16 p1, uint16 p2) {
return ((((p1 & redblueMask) * w1 + (p2 & redblueMask) * w2) / (w1 + w2)) & redblueMask) |
((((p1 & greenMask) * w1 + (p2 & greenMask) * w2) / (w1 + w2)) & greenMask);
}
/**
* Interpolate three 16 bit pixels with the weights specified in the template
* parameters. Used by the hq scaler family.
*/
template<int bitFormat, int w1, int w2, int w3>
static inline uint16 interpolate16_3(uint16 p1, uint16 p2, uint16 p3) {
return ((((p1 & redblueMask) * w1 + (p2 & redblueMask) * w2 + (p3 & redblueMask) * w3) / (w1 + w2 + w3)) & redblueMask) |
((((p1 & greenMask) * w1 + (p2 & greenMask) * w2 + (p3 & greenMask) * w3) / (w1 + w2 + w3)) & greenMask);
}
/**
* Compare two YUV values (encoded 8-8-8) and check if they differ by more than
* a certain hard coded threshold. Used by the hq scaler family.
*/
static inline bool diffYUV(int yuv1, int yuv2) {
static const int Ymask = 0x00FF0000;
static const int Umask = 0x0000FF00;
static const int Vmask = 0x000000FF;
static const int trY = 0x00300000;
static const int trU = 0x00000700;
static const int trV = 0x00000006;
int diff;
int mask;
diff = ((yuv1 & Ymask) - (yuv2 & Ymask));
mask = diff >> 31; // -1 if value < 0, 0 otherwise
diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
if (diff > trY) return true;
diff = ((yuv1 & Umask) - (yuv2 & Umask));
mask = diff >> 31; // -1 if value < 0, 0 otherwise
diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
if (diff > trU) return true;
diff = ((yuv1 & Vmask) - (yuv2 & Vmask));
mask = diff >> 31; // -1 if value < 0, 0 otherwise
diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
if (diff > trV) return true;
return false;
/*
return
( ( ABS((yuv1 & Ymask) - (yuv2 & Ymask)) > trY ) ||
( ABS((yuv1 & Umask) - (yuv2 & Umask)) > trU ) ||
( ABS((yuv1 & Vmask) - (yuv2 & Vmask)) > trV ) );
*/
}
/**
* 16bit RGB to YUV conversion table. This table is setup by InitLUT().
* Used by the hq scaler family.
*/
extern int RGBtoYUV[65536];
/** Auxiliary macro to simplify creating those template function wrappers. */
#define MAKE_WRAPPER(FUNC) \
void FUNC(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) { \
if (gBitFormat == 565) \
FUNC ## Template<565>(srcPtr, srcPitch, dstPtr, dstPitch, width, height); \
else \
FUNC ## Template<555>(srcPtr, srcPitch, dstPtr, dstPitch, width, height); \
}
/** Specifies the currently active 16bit pixel format, 555 or 565. */
extern int gBitFormat;
#endif
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