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/*
* 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.
*/
#include "libs/graphics/sdl/sdl_common.h"
#include "types.h"
#include "scalers.h"
#include "scaleint.h"
#include "2xscalers.h"
// Scaler function lookup table
//
const Scale_FuncDef_t
Scale_C_Functions[] =
{
{TFB_GFXFLAGS_SCALE_BILINEAR, Scale_BilinearFilter},
{TFB_GFXFLAGS_SCALE_BIADAPT, Scale_BiAdaptFilter},
{TFB_GFXFLAGS_SCALE_BIADAPTADV, Scale_BiAdaptAdvFilter},
{TFB_GFXFLAGS_SCALE_TRISCAN, Scale_TriScanFilter},
{TFB_GFXFLAGS_SCALE_HQXX, Scale_HqFilter},
// Default
{0, Scale_Nearest}
};
// See
// nearest2x.c -- Nearest Neighboor scaling
// bilinear2x.c -- Bilinear scaling
// biadv2x.c -- Advanced Biadapt scaling
// triscan2x.c -- Triscan scaling
// Biadapt scaling to 2x
void
SCALE_(BiAdaptFilter) (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;
Uint32 *src_p = (Uint32 *)src->pixels;
Uint32 *dst_p = (Uint32 *)dst->pixels;
Uint32 pixval_tl, pixval_tr, pixval_bl, pixval_br;
// these macros are for clarity; they make the current pixel (0,0)
// and allow to access pixels in all directions
#define SRC(x, y) (src_p + (x) + ((y) * slen))
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;
// 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)
{
pixval_tl = SCALE_GETPIX (SRC (0, 0));
SCALE_SETPIX (dst_p, pixval_tl);
if (y + 1 < h)
{
// check pixel below the current one
pixval_bl = SCALE_GETPIX (SRC (0, 1));
if (pixval_tl == pixval_bl)
SCALE_SETPIX (dst_p + dlen, pixval_tl);
else
SCALE_SETPIX (dst_p + dlen, Scale_Blend_11 (
pixval_tl, pixval_bl)
);
}
else
{
// last pixel in column - propagate
SCALE_SETPIX (dst_p + dlen, pixval_tl);
pixval_bl = pixval_tl;
}
++dst_p;
if (x + 1 >= w)
{
// last pixel in row - propagate
SCALE_SETPIX (dst_p, pixval_tl);
if (pixval_tl == pixval_bl)
SCALE_SETPIX (dst_p + dlen, pixval_tl);
else
SCALE_SETPIX (dst_p + dlen, Scale_Blend_11 (
pixval_tl, pixval_bl)
);
continue;
}
// check pixel to the right from the current one
pixval_tr = SCALE_GETPIX (SRC (1, 0));
if (pixval_tl == pixval_tr)
SCALE_SETPIX (dst_p, pixval_tr);
else
SCALE_SETPIX (dst_p, Scale_Blend_11 (
pixval_tl, pixval_tr)
);
if (y + 1 >= h)
{
// last pixel in column - propagate
SCALE_SETPIX (dst_p + dlen, pixval_tl);
continue;
}
// check pixel to the bottom-right
pixval_br = SCALE_GETPIX (SRC (1, 1));
if (pixval_tl == pixval_br && pixval_tr == pixval_bl)
{
int cl, cr;
Uint32 clr;
if (pixval_tl == pixval_tr)
{
// all 4 are equal - propagate
SCALE_SETPIX (dst_p + dlen, pixval_tl);
continue;
}
// 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 = 1;
if (x > 0)
{
clr = SCALE_GETPIX (SRC (-1, 0));
if (clr == pixval_tl)
cl++;
else if (clr == pixval_tr)
cr++;
clr = SCALE_GETPIX (SRC (-1, 1));
if (clr == pixval_tl)
cl++;
else if (clr == pixval_tr)
cr++;
}
if (y > 0)
{
clr = SCALE_GETPIX (SRC (0, -1));
if (clr == pixval_tl)
cl++;
else if (clr == pixval_tr)
cr++;
clr = SCALE_GETPIX (SRC (1, -1));
if (clr == pixval_tl)
cl++;
else if (clr == pixval_tr)
cr++;
}
if (x + 2 < w)
{
clr = SCALE_GETPIX (SRC (2, 0));
if (clr == pixval_tl)
cl++;
else if (clr == pixval_tr)
cr++;
clr = SCALE_GETPIX (SRC (2, 1));
if (clr == pixval_tl)
cl++;
else if (clr == pixval_tr)
cr++;
}
if (y + 2 < h)
{
clr = SCALE_GETPIX (SRC (0, 2));
if (clr == pixval_tl)
cl++;
else if (clr == pixval_tr)
cr++;
clr = SCALE_GETPIX (SRC (1, 2));
if (clr == pixval_tl)
cl++;
else if (clr == pixval_tr)
cr++;
}
// least count wins
if (cl > cr)
SCALE_SETPIX (dst_p + dlen, pixval_tr);
else if (cr > cl)
SCALE_SETPIX (dst_p + dlen, pixval_tl);
else
SCALE_SETPIX (dst_p + dlen,
Scale_Blend_11 (pixval_tl, pixval_tr));
}
else if (pixval_tl == pixval_br)
{
// main diagonal is same color
// use its value
SCALE_SETPIX (dst_p + dlen, pixval_tl);
}
else if (pixval_tr == pixval_bl)
{
// 2nd diagonal is same color
// use its value
SCALE_SETPIX (dst_p + dlen, pixval_tr);
}
else
{
// blend all 4
SCALE_SETPIX (dst_p + dlen, Scale_Blend_1111 (
pixval_tl, pixval_bl, pixval_tr, pixval_br
));
}
}
}
SCALE_(PlatDone) ();
}
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