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/* See LICENSE file for copyright and license details. */
#include "stream.h"
#include "util.h"
#include <string.h>
USAGE("[-xyza] kernel [parameter] ...")
#define SUBUSAGE(FORMAT) "Usage: %s [-xyza] " FORMAT, argv0
#define MATRIX(...) ((const double[]){__VA_ARGS__});
#define STREQ3(A, B1, B2, B3) (!strcmp(A, B1) || !strcmp(A, B2) || !strcmp(A, B3))
#define LIST_KERNELS\
X(kernel_kirsch, "kirsch")\
X(kernel_box_blur, "box blur")\
X(kernel_sharpen, "sharpen")
static const double *
kernel_kirsch(int argc, char *argv[], size_t *rows, size_t *cols, double **free_this)
{
*free_this = NULL;
*rows = *cols = 3;
if (argc != 1)
eprintf(SUBUSAGE("'kirsch' direction"));
if (STREQ3(argv[0], "1", "N", "N")) return MATRIX( 5, 5, 5, -3, 0, -3, -3, -3, -3);
if (STREQ3(argv[0], "2", "NW", "WN")) return MATRIX( 5, 5, -3, 5, 0, -3, -3, -3, -3);
if (STREQ3(argv[0], "3", "W", "W")) return MATRIX( 5, -3, -3, 5, 0, -3, 5, -3, -3);
if (STREQ3(argv[0], "4", "SW", "WS")) return MATRIX(-3, -3, -3, 5, 0, -3, 5, 5, -3);
if (STREQ3(argv[0], "5", "S", "S")) return MATRIX(-3, -3, -3, -3, 0, -3, 5, 5, 5);
if (STREQ3(argv[0], "6", "SE", "ES")) return MATRIX(-3, -3, -3, -3, 0, 5, -3, 5, 5);
if (STREQ3(argv[0], "7", "E", "E")) return MATRIX(-3, -3, 5, -3, 0, 5, -3, -3, 5);
if (STREQ3(argv[0], "8", "NE", "EN")) return MATRIX(-3, 5, 5, -3, 0, 5, -3, -3, -3);
eprintf("Unrecognised direction: %s\n", argv[0]);
return NULL;
}
static const double *
kernel_box_blur(int argc, char *argv[], size_t *rows, size_t *cols, double **free_this)
{
size_t sx, sy, i, n;
double *cells, value;
*free_this = NULL;
*rows = *cols = 3;
if (argc > 3)
eprintf(SUBUSAGE("'box blur' [spread | x-spread y-spread]"));
if (!argc)
return MATRIX(1.0 / 9.0, 1.0 / 9.0, 1.0 / 9.0,
1.0 / 9.0, 1.0 / 9.0, 1.0 / 9.0,
1.0 / 9.0, 1.0 / 9.0, 1.0 / 9.0);
if (argc == 1) {
sx = sy = etozu_arg("spread", argv[0], 0, SIZE_MAX / 2);
} else {
sx = etozu_arg("x-spread", argv[0], 0, SIZE_MAX / 2);
sy = etozu_arg("y-spread", argv[1], 0, SIZE_MAX / 2);
}
*rows = 2 * sy + 1;
*cols = 2 * sx + 1;
*free_this = cells = emalloc2(*rows, *cols);
n = (2 * sy + 1) * (2 * sx + 1);
value = 1 / (double)n;
for (i = 0; i < n; i++)
cells[i] = value;
return cells;
}
static const double *
kernel_sharpen(int argc, char *argv[], size_t *rows, size_t *cols, double **free_this)
{
*free_this = NULL;
*rows = *cols = 3;
if (argc)
eprintf(SUBUSAGE("'sharpen'"));
return MATRIX(0, -1, 0, -1, 5, -1, 0, -1, -0);
(void) argv;
}
int
main(int argc, char *argv[])
{
int null_x = 1, null_y = 1, null_z = 1, null_a = 1;
size_t rows, cols, y, x, n;
const double *kernel, *kern;
double *buffer, *buf, *free_this;
ARGBEGIN {
case 'x':
null_x = 0;
break;
case 'y':
null_y = 0;
break;
case 'z':
null_z = 0;
break;
case 'a':
null_a = 0;
break;
default:
usage();
} ARGEND;
if (null_x && null_y && null_z && null_a)
null_x = null_y = null_z = null_a = 0;
if (0);
#define X(FUNC, NAME)\
else if (!strcmp(argv[0], NAME))\
kernel = FUNC(argc, argv + 1, &rows, &cols, &free_this);
LIST_KERNELS
#undef X
else
eprintf("unrecognised kernel: %s\n", argv[0]);
FPRINTF_HEAD(stdout, (size_t)1, cols, rows, "xyza");
efflush(stdout, "<stdout>");
buffer = emalloc2(cols, 4 * sizeof(double));
n = cols * 4 * sizeof(double);
kern = kernel;
for (y = 0; y < rows; y++) {
buf = buffer;
for (x = 0; x < cols; x++) {
buf[0] = null_x ? 0.0 : *kern;
buf[1] = null_y ? 0.0 : *kern;
buf[2] = null_z ? 0.0 : *kern;
buf[3] = null_a ? 0.0 : *kern;
buf += 4;
kern++;
}
ewriteall(STDOUT_FILENO, buffer, n, "<stdout>");
}
free(buffer);
free(free_this);
return 0;
}
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