| 1 |
// fill transparent areas of an image with nearby values
|
| 2 |
// increases compressibility and enhances image quality
|
| 3 |
// in the presence of naive interpolation algorithms.
|
| 4 |
|
| 5 |
//----------------------------------------------------------
|
| 6 |
//Copyright (C) 2006 Marc Lehmann <pcg@goof.com>
|
| 7 |
|
| 8 |
//This program is free software; you can redistribute it and/or
|
| 9 |
//modify it under the terms of the GNU Lesser General Public
|
| 10 |
//License as published by the Free Software Foundation; either
|
| 11 |
//version 2.1 of the License, or (at your option) any later version.
|
| 12 |
//
|
| 13 |
//This program is distributed in the hope that it will be useful,
|
| 14 |
//but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 15 |
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
| 16 |
//Lesser General Public License for more details.
|
| 17 |
//
|
| 18 |
//You should have received a copy of the GNU Lesser General Public
|
| 19 |
//License along with this program; if not, write to the Free Software
|
| 20 |
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
| 21 |
|
| 22 |
#include <cstdio>
|
| 23 |
#include <cstdlib>
|
| 24 |
#include <cstring>
|
| 25 |
#include <stdint.h>
|
| 26 |
#include <endian.h>
|
| 27 |
|
| 28 |
using namespace std;
|
| 29 |
|
| 30 |
#if __BYTE_ORDER == __BIG_ENDIAN
|
| 31 |
# define Rshift 24
|
| 32 |
# define Gshift 16
|
| 33 |
# define Bshift 8
|
| 34 |
# define Ashift 0
|
| 35 |
#else
|
| 36 |
# define Rshift 0
|
| 37 |
# define Gshift 8
|
| 38 |
# define Bshift 16
|
| 39 |
# define Ashift 24
|
| 40 |
#endif
|
| 41 |
|
| 42 |
#define Cmask 0xffUL
|
| 43 |
#define Amask (Cmask << Ashift)
|
| 44 |
|
| 45 |
typedef uint32_t pixel;
|
| 46 |
|
| 47 |
inline void gather (pixel *img, char *flag, int x, int y, int w, int h, int &c, int &r, int &g, int &b)
|
| 48 |
{
|
| 49 |
if (x < 0 || x >= w)
|
| 50 |
return;
|
| 51 |
|
| 52 |
if (y < 0 || y >= h)
|
| 53 |
return;
|
| 54 |
|
| 55 |
int p = img [y * w + x];
|
| 56 |
|
| 57 |
int weight = (p >> Ashift) & Cmask;
|
| 58 |
if (!weight)
|
| 59 |
weight = !!flag [y * w + x];
|
| 60 |
|
| 61 |
if (!weight)
|
| 62 |
return;
|
| 63 |
|
| 64 |
c += weight;
|
| 65 |
|
| 66 |
r += ((p >> Rshift) & Cmask) * weight;
|
| 67 |
g += ((p >> Gshift) & Cmask) * weight;
|
| 68 |
b += ((p >> Bshift) & Cmask) * weight;
|
| 69 |
}
|
| 70 |
|
| 71 |
void filla (pixel *img, int w, int h)
|
| 72 |
{
|
| 73 |
char *flag = (char *)calloc (w * h, 1);
|
| 74 |
char *flag2 = (char *)calloc (w * h, 1);
|
| 75 |
pixel *dst = new pixel [w * h];
|
| 76 |
|
| 77 |
for (int iter = 3; --iter; )
|
| 78 |
{
|
| 79 |
for (int x = 0; x < w; x++)
|
| 80 |
for (int y = 0; y < h; y++)
|
| 81 |
{
|
| 82 |
int o = y * w + x;
|
| 83 |
|
| 84 |
if ((img [o] & Amask) || flag [o])
|
| 85 |
dst [o] = img [o];
|
| 86 |
else
|
| 87 |
{
|
| 88 |
int weight = 0, r = 0, g = 0, b = 0;
|
| 89 |
|
| 90 |
gather (img, flag, x - 1, y - 1, w, h, weight, r, g, b);
|
| 91 |
gather (img, flag, x , y - 1, w, h, weight, r, g, b);
|
| 92 |
gather (img, flag, x + 1, y - 1, w, h, weight, r, g, b);
|
| 93 |
gather (img, flag, x - 1, y , w, h, weight, r, g, b);
|
| 94 |
gather (img, flag, x + 1, y , w, h, weight, r, g, b);
|
| 95 |
gather (img, flag, x - 1, y + 1, w, h, weight, r, g, b);
|
| 96 |
gather (img, flag, x , y + 1, w, h, weight, r, g, b);
|
| 97 |
gather (img, flag, x + 1, y + 1, w, h, weight, r, g, b);
|
| 98 |
|
| 99 |
if (weight)
|
| 100 |
{
|
| 101 |
flag2 [o] = 1;
|
| 102 |
dst [o] = ((r + weight / 2) / weight) << Rshift
|
| 103 |
| ((g + weight / 2) / weight) << Gshift
|
| 104 |
| ((b + weight / 2) / weight) << Bshift;
|
| 105 |
}
|
| 106 |
else
|
| 107 |
dst [o] = img [o]; // not yet here
|
| 108 |
}
|
| 109 |
}
|
| 110 |
|
| 111 |
memcpy (img, dst, w * h * sizeof (pixel));
|
| 112 |
memcpy (flag, flag2, w * h);
|
| 113 |
}
|
| 114 |
|
| 115 |
for (int o = w * h; o--; )
|
| 116 |
if (!(img [o] & Amask || flag [o]))
|
| 117 |
img [o] = 0;
|
| 118 |
|
| 119 |
free (dst);
|
| 120 |
free (flag);
|
| 121 |
free (flag2);
|
| 122 |
}
|
| 123 |
|
| 124 |
int main (int argc, char* argv[])
|
| 125 |
{
|
| 126 |
if (argc <= 2)
|
| 127 |
{
|
| 128 |
printf("\nUsage: filla w h <input.rgba >output.rgba\n");
|
| 129 |
printf("input file must be 32 bit rgba w*h.\n");
|
| 130 |
return 1;
|
| 131 |
}
|
| 132 |
|
| 133 |
int w = atoi (argv [1]);
|
| 134 |
int h = atoi (argv [2]);
|
| 135 |
|
| 136 |
int size = w * h * sizeof (pixel);
|
| 137 |
|
| 138 |
pixel *img = (pixel *)new unsigned char [size];
|
| 139 |
|
| 140 |
if (fread (img, size, 1, stdin) != 1)
|
| 141 |
{
|
| 142 |
perror ("unable to read input file\n");
|
| 143 |
exit (1);
|
| 144 |
}
|
| 145 |
|
| 146 |
filla (img, w, h);
|
| 147 |
|
| 148 |
if (fwrite (img, size, 1, stdout) != 1)
|
| 149 |
{
|
| 150 |
perror ("unable to read output file\n");
|
| 151 |
exit (1);
|
| 152 |
}
|
| 153 |
|
| 154 |
return 0;
|
| 155 |
}
|
