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	blind-mosaic-edges.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-mosaic-edges.c (2755B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("[-xy]")
	5
	6 int
	7 main(int argc, char *argv[])
	8 {
	9 int tiled_x = 0;
	10 int tiled_y = 0;
	11 struct stream stream;
	12 void *colours[2];
	13 char buf, edges, *here;
	14 size_t i, n, x, y;
	15 int v;
	16
	17 ARGBEGIN {
	18 case 'x':
	19 tiled_x = 1;
	20 break;
	21 case 'y':
	22 tiled_y = 1;
	23 break;
	24 default:
	25 usage();
	26 } ARGEND;
	27
	28 if (argc)
	29 usage();
	30
	31 eopen_stream(&stream, NULL);
	32 echeck_dimensions(&stream, WIDTH \| HEIGHT, NULL);
	33
	34 n = stream.width * stream.height;
	35 buf = emalloc(stream.frame_size);
	36 edges = emalloc((n + 7) / 8);
	37
	38 colours[0] = alloca(stream.pixel_size);
	39 colours[1] = alloca(stream.pixel_size);
	40 memset(colours[0], 0, stream.pixel_size);
	41
	42 if (stream.encoding == DOUBLE) {
	43 ((double *)(colours[1]))[0] = (double)1;
	44 ((double *)(colours[1]))[1] = (double)1;
	45 ((double *)(colours[1]))[2] = (double)1;
	46 ((double *)(colours[1]))[3] = (double)1;
	47 } else if (stream.encoding == FLOAT) {
	48 ((float *)(colours[1]))[0] = (float)1;
	49 ((float *)(colours[1]))[1] = (float)1;
	50 ((float *)(colours[1]))[2] = (float)1;
	51 ((float *)(colours[1]))[3] = (float)1;
	52 } else {
	53 eprintf("pixel format %s is not supported, try xyza\n", …
	54 }
	55
	56 fprint_stream_head(stdout, &stream);
	57 efflush(stdout, "<stdout>");
	58
	59 while (eread_frame(&stream, buf)) {
	60 memset(edges, 0, (n + 7) / 8);
	61 for (i = 0; i < n; i++) {
	62 here = buf + i * stream.pixel_size;
	63 x = i % stream.width;
	64 y = i / stream.width;
	65
	66 if (x != stream.width - 1) {
	67 if (memcmp(here + stream.pixel_size, her…
	68 goto at_edge;
	69 } else if (tiled_x) {
	70 if (memcmp(here + stream.pixel_size - st…
	71 goto at_edge;
	72 }
	73
	74 if (x) {
	75 if (memcmp(here - stream.pixel_size, her…
	76 goto at_edge;
	77 } else if (tiled_x) {
	78 if (memcmp(here + stream.row_size - stre…
	79 goto at_edge;
	80 }
	81
	82 if (y != stream.height - 1) {
	83 if (memcmp(here + stream.row_size, here,…
	84 goto at_edge;
	85 } else if (tiled_y) {
	86 if (memcmp(here + stream.row_size - stre…
	87 goto at_edge;
	88 }
	89
	90 if (y) {
	91 if (memcmp(here - stream.row_size, here,…
	92 goto at_edge;
	93 } else if (tiled_y) {
	94 if (memcmp(here + stream.frame_size - st…
	95 goto at_edge;
	96 }
	97
	98 continue;
	99 at_edge:
	100 edges[i >> 3] \|= (char)(1 << (i & 7));
	101 }
	102 for (i = 0; i < n; i++) {
	103 v = (edges[i >> 3] >> (i & 7)) & 1;
	104 memcpy(buf + i * stream.pixel_size, colours[v], …
	105 }
	106 ewriteall(STDOUT_FILENO, buf, stream.frame_size, "<stdou…
	107 }
	108
	109 free(buf);
	110 free(edges);
	111 return 0;
	112 }