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/* See LICENSE file for copyright and license details. */
#ifndef TYPE
#include "common.h"
USAGE("[-apPxy] kernel-stream")
static int no_alpha = 0;
static int dont_premultiply = 0;
static int per_pixel = 0;
static int wrap_x = 0;
static int wrap_y = 0;
static size_t kern_w;
static size_t kern_h;
#define FILE "blind-apply-kernel.c"
#include "define-functions.h"
int
main(int argc, char *argv[])
{
struct stream colour, kernel;
void (*process)(struct stream *colour, struct stream *kernel);
size_t tmp;
ARGBEGIN {
case 'a':
no_alpha = 1;
break;
case 'p':
per_pixel = 1;
break;
case 'P':
dont_premultiply = 1;
break;
case 'x':
wrap_x = 1;
break;
case 'y':
wrap_y = 1;
break;
default:
usage();
} ARGEND;
if (argc != 1)
usage();
eopen_stream(&colour, NULL);
eopen_stream(&kernel, argv[0]);
SELECT_PROCESS_FUNCTION(&colour);
CHECK_ALPHA_CHAN(&colour);
CHECK_N_CHAN(&colour, 4, 4);
if (colour.encoding != kernel.encoding || colour.n_chan != kernel.n_chan)
eprintf("videos use incompatible pixel formats");
if (per_pixel && !(kernel.width % colour.width || kernel.height % colour.height))
eprintf("-p is specified but the dimensions of kernel-stream "
"are not multiples of the dimensions of stdin.");
kern_w = per_pixel ? kernel.width / colour.width : kernel.width;
kern_h = per_pixel ? kernel.height / colour.height : kernel.height;
tmp = kernel.height, kernel.height = kern_h;
echeck_dimensions(&colour, WIDTH | HEIGHT, NULL);
echeck_dimensions(&kernel, WIDTH | HEIGHT, NULL);
kernel.height = tmp;
fprint_stream_head(stdout, &colour);
efflush(stdout, "<stdout>");
process(&colour, &kernel);
return 0;
}
#else
static void
PROCESS(struct stream *colour, struct stream *kernel)
{
TYPE *out, *clr, *krn, *kern, *pix;
size_t i, x, y, n, x2, y2;
ssize_t cx, cy, xoff, yoff;
out = emalloc(colour->frame_size);
clr = emalloc(colour->frame_size);
krn = emalloc2(kern_h, kernel->row_size);
xoff = (ssize_t)(kern_w / 2);
yoff = (ssize_t)(kern_h / 2);
n = colour->width * colour->height * colour->n_chan;
while (eread_frame(colour, clr)) {
/* premultiply */
if (!no_alpha && !dont_premultiply) {
for (i = 0; i < n; i += 4) {
clr[i + 0] *= clr[i + 3];
clr[i + 1] *= clr[i + 3];
clr[i + 2] *= clr[i + 3];
}
}
/* apply kernel */
memset(out, 0, colour->frame_size);
pix = out;
for (y = 0; y < colour->height; y++) {
if ((!y || per_pixel) && !eread_segment(kernel, krn, kern_h * kernel->row_size))
goto done;
for (x = 0; x < colour->width; x++, pix += colour->n_chan) {
kern = per_pixel ? (krn + x * kern_w * kernel->n_chan) : krn;
for (y2 = 0; y2 < kern_h; y2++, kern += kernel->width * kernel->n_chan) {
cy = (ssize_t)(y + y2) - yoff;
if (cy < 0 || (size_t)cy >= colour->height) {
if (!wrap_y)
continue;
cy %= (ssize_t)(colour->height);
if (cy < 0)
cy += (ssize_t)(colour->height);
}
for (x2 = 0; x2 < kern_w; x2++) {
cx = (ssize_t)(x + x2) - xoff;
if (cx < 0 || (size_t)cx >= colour->width) {
if (!wrap_x)
continue;
cx %= (ssize_t)(colour->width);
if (cx < 0)
cx += (ssize_t)(colour->width);
}
for (i = 0; i < colour->n_chan; i++)
pix[i] += kern[x2 * kernel->n_chan + i] *
clr[((size_t)cy * colour->width + (size_t)cx) * colour->n_chan + i];
}
}
}
}
/* unpremultiply */
if (!dont_premultiply) {
for (i = 0; i < n; i += 4) {
if (out[i + 3]) {
out[i + 0] /= out[i + 3];
out[i + 1] /= out[i + 3];
out[i + 2] /= out[i + 3];
}
}
}
/* ensure video is opaque if -a was used */
if (no_alpha)
for (i = 0; i < n; i += 4)
out[i + 3] = 1;
/* output video */
ewriteall(STDOUT_FILENO, out, colour->frame_size, "<stdout>");
}
done:
free(out);
free(clr);
free(krn);
}
#endif
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