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|
/*
* Portions Copyright (C) 2003-2005 Alex Volkov (codepro@usa.net)
*
* 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.
*/
// Core algorithm of the Advanced BiAdaptive screen scaler
// Template
// When this file is built standalone is produces a plain C version
// Also #included by 2xscalers_mmx.c for an MMX version
#include "libs/graphics/sdl/sdl_common.h"
#include "types.h"
#include "scalers.h"
#include "scaleint.h"
#include "2xscalers.h"
// Advanced biadapt scaling to 2x
// The name expands to either
// Scale_BiAdaptAdvFilter (for plain C) or
// Scale_MMX_BiAdaptAdvFilter (for MMX)
// [others when platforms are added]
void
SCALE_(BiAdaptAdvFilter) (SDL_Surface *src, SDL_Surface *dst, SDL_Rect *r)
{
int x, y;
const int w = src->w, h = src->h;
int xend, yend;
int dsrc, ddst;
SDL_Rect *region = r;
SDL_Rect limits;
SDL_PixelFormat *fmt = dst->format;
const int sp = src->pitch, dp = dst->pitch;
const int bpp = fmt->BytesPerPixel;
const int slen = sp / bpp, dlen = dp / bpp;
// for clarity purposes, the 'pixels' array here is transposed
Uint32 pixels[4][4];
static int resolve_coord[][2] =
{
{0, -1}, {1, -1}, { 2, 0}, { 2, 1},
{1, 2}, {0, 2}, {-1, 1}, {-1, 0},
{100, 100} // term
};
Uint32 *src_p = (Uint32 *)src->pixels;
Uint32 *dst_p = (Uint32 *)dst->pixels;
// these macros are for clarity; they make the current pixel (0,0)
// and allow to access pixels in all directions
#define PIX(x, y) (pixels[1 + (x)][1 + (y)])
#define SRC(x, y) (src_p + (x) + ((y) * slen))
// commonly used operations, for clarity also
// others are defined at their respective bpp levels
#define BIADAPT_RGBHIGH 8000
#define BIADAPT_YUVLOW 30
#define BIADAPT_YUVMED 70
#define BIADAPT_YUVHIGH 130
// high tolerance pixel comparison
#define BIADAPT_CMPRGB_HIGH(p1, p2) \
(p1 == p2 || SCALE_CMPRGB (p1, p2) <= BIADAPT_RGBHIGH)
// low tolerance pixel comparison
#define BIADAPT_CMPYUV_LOW(p1, p2) \
(p1 == p2 || SCALE_CMPYUV (p1, p2, BIADAPT_YUVLOW))
// medium tolerance pixel comparison
#define BIADAPT_CMPYUV_MED(p1, p2) \
(p1 == p2 || SCALE_CMPYUV (p1, p2, BIADAPT_YUVMED))
// high tolerance pixel comparison
#define BIADAPT_CMPYUV_HIGH(p1, p2) \
(p1 == p2 || SCALE_CMPYUV (p1, p2, BIADAPT_YUVHIGH))
SCALE_(PlatInit) ();
// expand updated region if necessary
// pixels neighbooring the updated region may
// change as a result of updates
limits.x = 0;
limits.y = 0;
limits.w = src->w;
limits.h = src->h;
Scale_ExpandRect (region, 2, &limits);
xend = region->x + region->w;
yend = region->y + region->h;
dsrc = slen - region->w;
ddst = (dlen - region->w) * 2;
#define SCALE_GETPIX(p) ( *(Uint32 *)(p) )
#define SCALE_SETPIX(p, c) ( *(Uint32 *)(p) = (c) )
// move ptrs to the first updated pixel
src_p += slen * region->y + region->x;
dst_p += (dlen * region->y + region->x) * 2;
for (y = region->y; y < yend; ++y, dst_p += ddst, src_p += dsrc)
{
for (x = region->x; x < xend; ++x, ++src_p, ++dst_p)
{
// pixel equality counter
int cmatch;
// most pixels will fall into 'all 4 equal'
// pattern, so we check it first
cmatch = 0;
PIX (0, 0) = SCALE_GETPIX (SRC (0, 0));
SCALE_SETPIX (dst_p, PIX (0, 0));
if (y + 1 < h)
{
// check pixel below the current one
PIX (0, 1) = SCALE_GETPIX (SRC (0, 1));
if (PIX (0, 0) == PIX (0, 1))
{
SCALE_SETPIX (dst_p + dlen, PIX (0, 0));
cmatch |= 1;
}
}
else
{
// last pixel in column - propagate
PIX (0, 1) = PIX (0, 0);
SCALE_SETPIX (dst_p + dlen, PIX (0, 0));
cmatch |= 1;
}
if (x + 1 < w)
{
// check pixel to the right from the current one
PIX (1, 0) = SCALE_GETPIX (SRC (1, 0));
if (PIX (0, 0) == PIX (1, 0))
{
SCALE_SETPIX (dst_p + 1, PIX (0, 0));
cmatch |= 2;
}
}
else
{
// last pixel in row - propagate
PIX (1, 0) = PIX (0, 0);
SCALE_SETPIX (dst_p + 1, PIX (0, 0));
cmatch |= 2;
}
if (cmatch == 3)
{
if (y + 1 >= h || x + 1 >= w)
{
// last pixel in row/column and nearest
// neighboor is identical
dst_p++;
SCALE_SETPIX (dst_p + dlen, PIX (0, 0));
continue;
}
// check pixel to the bottom-right
PIX (1, 1) = SCALE_GETPIX (SRC (1, 1));
if (PIX (0, 0) == PIX (1, 1))
{
// all 4 are equal - propagate
dst_p++;
SCALE_SETPIX (dst_p + dlen, PIX (0, 0));
continue;
}
}
// some neighboors are different, lets check them
if (x > 0)
PIX (-1, 0) = SCALE_GETPIX (SRC (-1, 0));
else
PIX (-1, 0) = PIX (0, 0);
if (x + 2 < w)
PIX (2, 0) = SCALE_GETPIX (SRC (2, 0));
else
PIX (2, 0) = PIX (1, 0);
if (y + 1 < h)
{
if (x > 0)
PIX (-1, 1) = SCALE_GETPIX (SRC (-1, 1));
else
PIX (-1, 1) = PIX (0, 1);
if (x + 2 < w)
{
PIX (1, 1) = SCALE_GETPIX (SRC (1, 1));
PIX (2, 1) = SCALE_GETPIX (SRC (2, 1));
}
else if (x + 1 < w)
{
PIX (1, 1) = SCALE_GETPIX (SRC (1, 1));
PIX (2, 1) = PIX (1, 1);
}
else
{
PIX (1, 1) = PIX (0, 1);
PIX (2, 1) = PIX (0, 1);
}
}
else
{
// last pixel in column
PIX (-1, 1) = PIX (-1, 0);
PIX (1, 1) = PIX (1, 0);
PIX (2, 1) = PIX (2, 0);
}
if (y + 2 < h)
{
PIX (0, 2) = SCALE_GETPIX (SRC (0, 2));
if (x > 0)
PIX (-1, 2) = SCALE_GETPIX (SRC (-1, 2));
else
PIX (-1, 2) = PIX (0, 2);
if (x + 2 < w)
{
PIX (1, 2) = SCALE_GETPIX (SRC (1, 2));
PIX (2, 2) = SCALE_GETPIX (SRC (2, 2));
}
else if (x + 1 < w)
{
PIX (1, 2) = SCALE_GETPIX (SRC (1, 2));
PIX (2, 2) = PIX (1, 2);
}
else
{
PIX (1, 2) = PIX (0, 2);
PIX (2, 2) = PIX (0, 2);
}
}
else
{
// last pixel in column
PIX (-1, 2) = PIX (-1, 1);
PIX (0, 2) = PIX (0, 1);
PIX (1, 2) = PIX (1, 1);
PIX (2, 2) = PIX (2, 1);
}
if (y > 0)
{
PIX (0, -1) = SCALE_GETPIX (SRC (0, -1));
if (x > 0)
PIX (-1, -1) = SCALE_GETPIX (SRC (-1, -1));
else
PIX (-1, -1) = PIX (0, -1);
if (x + 2 < w)
{
PIX (1, -1) = SCALE_GETPIX (SRC (1, -1));
PIX (2, -1) = SCALE_GETPIX (SRC (2, -1));
}
else if (x + 1 < w)
{
PIX (1, -1) = SCALE_GETPIX (SRC (1, -1));
PIX (2, -1) = PIX (1, -1);
}
else
{
PIX (1, -1) = PIX (0, -1);
PIX (2, -1) = PIX (0, -1);
}
}
else
{
PIX (-1, -1) = PIX (-1, 0);
PIX (0, -1) = PIX (0, 0);
PIX (1, -1) = PIX (1, 0);
PIX (2, -1) = PIX (2, 0);
}
// check pixel below the current one
if (!(cmatch & 1))
{
if (SCALE_CMPYUV (PIX (0, 0), PIX (0, 1), BIADAPT_YUVLOW))
{
SCALE_SETPIX (dst_p + dlen, Scale_Blend_11 (
PIX (0, 0), PIX (0, 1))
);
cmatch |= 1;
}
// detect a 2:1 line going across the current pixel
else if ( (PIX (0, 0) == PIX (-1, 0)
&& PIX (0, 0) == PIX (1, 1)
&& PIX (0, 0) == PIX (2, 1) &&
((!BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (-1, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (0, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (1, 0))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (2, 0))) ||
(!BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (-1, 1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (1, 2))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (2, 2))))) ||
(PIX (0, 0) == PIX (1, 0)
&& PIX (0, 0) == PIX (-1, 1)
&& PIX (0, 0) == PIX (2, -1) &&
((!BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (-1, 0))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (0, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (1, -1))) ||
(!BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (-1, 2))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (1, 1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (2, 0))))) )
{
SCALE_SETPIX (dst_p + dlen, PIX (0, 0));
}
// detect a 2:1 line going across the pixel below current
else if ( (PIX (0, 1) == PIX (-1, 0)
&& PIX (0, 1) == PIX (1, 1)
&& PIX (0, 1) == PIX (2, 2) &&
((!BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (-1, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (1, 0))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (2, 1))) ||
(!BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (-1, 1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (0, 2))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (1, 2))))) ||
(PIX (0, 1) == PIX (1, 0)
&& PIX (0, 1) == PIX (-1, 1)
&& PIX (0, 1) == PIX (2, 0) &&
((!BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (-1, 0))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (1, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (2, -1))) ||
(!BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (-1, 2))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (0, 2))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (1, 1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 1), PIX (2, 1))))) )
{
SCALE_SETPIX (dst_p + dlen, PIX (0, 1));
}
else
SCALE_SETPIX (dst_p + dlen, Scale_Blend_11 (
PIX (0, 0), PIX (0, 1))
);
}
dst_p++;
// check pixel to the right from the current one
if (!(cmatch & 2))
{
if (SCALE_CMPYUV (PIX (0, 0), PIX (1, 0), BIADAPT_YUVLOW))
{
SCALE_SETPIX (dst_p, Scale_Blend_11 (
PIX (0, 0), PIX (1, 0))
);
cmatch |= 2;
}
// detect a 1:2 line going across the current pixel
else if ( (PIX (0, 0) == PIX (1, -1)
&& PIX (0, 0) == PIX (0, 1)
&& PIX (0, 0) == PIX (-1, 2) &&
((!BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (0, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (-1, 0))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (-1, 1))) ||
(!BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (2, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (1, 1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (0, 2))))) ||
(PIX (0, 0) == PIX (0, -1)
&& PIX (0, 0) == PIX (1, 1)
&& PIX (0, 0) == PIX (1, 2) &&
((!BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (-1, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (-1, 0))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (0, 1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (0, 2))) ||
(!BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (1, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (2, 1))
&& !BIADAPT_CMPRGB_HIGH (PIX (0, 0), PIX (2, 2))))) )
{
SCALE_SETPIX (dst_p, PIX (0, 0));
}
// detect a 1:2 line going across the pixel to the right
else if ( (PIX (1, 0) == PIX (1, -1)
&& PIX (1, 0) == PIX (0, 1)
&& PIX (1, 0) == PIX (0, 2) &&
((!BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (0, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (-1, 1))
&& !BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (-1, 2))) ||
(!BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (2, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (2, 0))
&& !BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (1, 1))
&& !BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (1, 2))))) ||
(PIX (1, 0) == PIX (0, -1)
&& PIX (1, 0) == PIX (1, 1)
&& PIX (1, 0) == PIX (2, 2) &&
((!BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (-1, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (0, 1))
&& !BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (1, 2))) ||
(!BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (1, -1))
&& !BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (2, 0))
&& !BIADAPT_CMPRGB_HIGH (PIX (1, 0), PIX (2, 1))))) )
{
SCALE_SETPIX (dst_p, PIX (1, 0));
}
else
SCALE_SETPIX (dst_p, Scale_Blend_11 (
PIX (0, 0), PIX (1, 0))
);
}
if (PIX (0, 0) == PIX (1, 1) && PIX (1, 0) == PIX (0, 1))
{
// diagonals are equal
int *coord;
int cl, cr;
Uint32 clr;
// both pairs are equal, have to resolve the pixel
// race; we try detecting which color is
// the background by looking for a line or an edge
// examine 8 pixels surrounding the current quad
cl = cr = 2;
for (coord = resolve_coord[0]; *coord < 100; coord += 2)
{
clr = PIX (coord[0], coord[1]);
if (BIADAPT_CMPYUV_MED (clr, PIX (0, 0)))
cl++;
else if (BIADAPT_CMPYUV_MED (clr, PIX (1, 0)))
cr++;
}
// least count wins
if (cl > cr)
clr = PIX (1, 0);
else if (cr > cl)
clr = PIX (0, 0);
else
clr = Scale_Blend_11 (PIX (0, 0), PIX (1, 0));
SCALE_SETPIX (dst_p + dlen, clr);
continue;
}
if (cmatch == 3
|| (BIADAPT_CMPYUV_LOW (PIX (1, 0), PIX (0, 1))
&& BIADAPT_CMPYUV_LOW (PIX (1, 0), PIX (1, 1))))
{
SCALE_SETPIX (dst_p + dlen, Scale_Blend_11 (
PIX (0, 1), PIX (1, 0))
);
continue;
}
else if (cmatch && BIADAPT_CMPYUV_LOW (PIX (0, 0), PIX (1, 1)))
{
SCALE_SETPIX (dst_p + dlen, Scale_Blend_11 (
PIX (0, 0), PIX (1, 1))
);
continue;
}
// check pixel to the bottom-right
if (BIADAPT_CMPYUV_HIGH (PIX (0, 0), PIX (1, 1))
&& BIADAPT_CMPYUV_HIGH (PIX (1, 0), PIX (0, 1)))
{
if (SCALE_GETY (PIX (0, 0)) > SCALE_GETY (PIX (1, 0)))
{
SCALE_SETPIX (dst_p + dlen, Scale_Blend_11 (
PIX (0, 0), PIX (1, 1))
);
}
else
{
SCALE_SETPIX (dst_p + dlen, Scale_Blend_11 (
PIX (1, 0), PIX (0, 1))
);
}
}
else if (BIADAPT_CMPYUV_HIGH (PIX (0, 0), PIX (1, 1)))
{
// main diagonal is same color
// use its value
SCALE_SETPIX (dst_p + dlen, Scale_Blend_11 (
PIX (0, 0), PIX (1, 1))
);
}
else if (BIADAPT_CMPYUV_HIGH (PIX (1, 0), PIX (0, 1)))
{
// 2nd diagonal is same color
// use its value
SCALE_SETPIX (dst_p + dlen, Scale_Blend_11 (
PIX (1, 0), PIX (0, 1))
);
}
else
{
// blend all 4
SCALE_SETPIX (dst_p + dlen, Scale_Blend_1111 (
PIX (0, 0), PIX (0, 1),
PIX (1, 0), PIX (1, 1)
));
}
}
}
SCALE_(PlatDone) ();
}
|
