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	Add blind-mosaic-edges - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	commit 8a2f7656c100fe9062782977ec5c82212d092ab9
	parent 5c3968e6eda6583e9e2776be55e8d9af285e01a8
	Author: Mattias Andrée <[email protected]>
	Date: Fri, 14 Jul 2017 00:32:31 +0200

	Add blind-mosaic-edges

	Signed-off-by: Mattias Andrée <[email protected]>

	Diffstat:
	M Makefile \| 1 +
	M man/blind-mosaic-edges.1 \| 12 +++++-------
	A src/blind-mosaic-edges.c \| 114 +++++++++++++++++++++++++++++…

	3 files changed, 120 insertions(+), 7 deletions(-)
	---
	diff --git a/Makefile b/Makefile
	@@ -42,6 +42,7 @@ BIN =\
	blind-linear-gradient\
	blind-make-kernel\
	blind-mosaic\
	+ blind-mosaic-edges\
	blind-next-frame\
	blind-norm\
	blind-quaternion-product\
	diff --git a/man/blind-mosaic-edges.1 b/man/blind-mosaic-edges.1
	@@ -20,13 +20,11 @@ At the upper and lower edges of the video,
	wrap around to the opposite edges.
	.SH REQUIREMENTS
	.B blind-mosaic-edges
	-requires enough free memory to load one full row into
	-memory. A row requires 32 bytes per pixel it contains.
	-If
	-.B -x
	-is used, two full rows all be needed, and if
	-.B -y
	-is used, one full frame will be needed.
	+requires enough free memory to load one full frame into
	+memory and 1 bit per pixel on a frame. A frame requires
	+32 bytes per pixel it contains.
	+.B blind-mosaic-edges
	+is optimised for simplicity rather the memory usage.
	.SH SEE ALSO
	.BR blind (7),
	.BR blind-hexagon-tessellation (1),
	diff --git a/src/blind-mosaic-edges.c b/src/blind-mosaic-edges.c
	@@ -0,0 +1,114 @@
	+/* See LICENSE file for copyright and license details. */
	+#include "common.h"
	+
	+USAGE("[-xy]")
	+
	+int
	+main(int argc, char *argv[])
	+{
	+ int tiled_x = 0;
	+ int tiled_y = 0;
	+ struct stream stream;
	+ void *colours[2];
	+ char *buf;
	+ char *edges;
	+ char *here;
	+ size_t i, n, x, y;
	+ int v;
	+
	+ ARGBEGIN {
	+ case 'x':
	+ tiled_x = 1;
	+ break;
	+ case 'y':
	+ tiled_y = 1;
	+ break;
	+ default:
	+ usage();
	+ } ARGEND;
	+
	+ if (argc)
	+ usage();
	+
	+ eopen_stream(&stream, NULL);
	+ echeck_dimensions(&stream, WIDTH \| HEIGHT, NULL);
	+
	+ n = stream.width * stream.height;
	+ buf = emalloc(stream.frame_size);
	+ edges = emalloc((n + 7) / 8);
	+
	+ colours[0] = alloca(stream.pixel_size);
	+ colours[1] = alloca(stream.pixel_size);
	+ memset(colours[0], 0, stream.pixel_size);
	+
	+ if (!strcmp(stream.pixfmt, "xyza")) {
	+ ((double *)(colours[1]))[0] = (double)1;
	+ ((double *)(colours[1]))[1] = (double)1;
	+ ((double *)(colours[1]))[2] = (double)1;
	+ ((double *)(colours[1]))[3] = (double)1;
	+ } else if (!strcmp(stream.pixfmt, "xyza f")) {
	+ ((float *)(colours[1]))[0] = (float)1;
	+ ((float *)(colours[1]))[1] = (float)1;
	+ ((float *)(colours[1]))[2] = (float)1;
	+ ((float *)(colours[1]))[3] = (float)1;
	+ } else {
	+ eprintf("pixel format %s is not supported, try xyza\n", stream…
	+ }
	+
	+ fprint_stream_head(stdout, &stream);
	+ efflush(stdout, "<stdout>");
	+
	+ while (eread_frame(&stream, buf)) {
	+ memset(edges, 0, (n + 7) / 8);
	+ for (i = 0; i < n; i++) {
	+ here = buf + i * stream.pixel_size;
	+ x = i % stream.width;
	+ y = i / stream.width;
	+
	+ if (x != stream.width - 1 &&
	+ memcmp(here + stream.pixel_size, here, stream.pixe…
	+ goto at_edge;
	+
	+ if (tiled_x && x == stream.width - 1 &&
	+ memcmp(here + stream.pixel_size - stream.row_size,…
	+ goto at_edge;
	+
	+ if (x &&
	+ memcmp(here - stream.pixel_size, here, stream.pixe…
	+ goto at_edge;
	+
	+ if (tiled_x && !x &&
	+ memcmp(here + stream.row_size - stream.pixel_size,…
	+ goto at_edge;
	+
	+ if (y != stream.height - 1 &&
	+ memcmp(here + stream.row_size, here, stream.pixel_…
	+ goto at_edge;
	+
	+ if (tiled_y && y == stream.height - 1 &&
	+ memcmp(here + stream.row_size - stream.frame_size,…
	+ goto at_edge;
	+
	+ if (y &&
	+ memcmp(here - stream.row_size, here, stream.pixel_…
	+ goto at_edge;
	+
	+ if (tiled_y && !y &&
	+ memcmp(here + stream.frame_size - stream.row_size,…
	+ goto at_edge;
	+
	+ continue;
	+ at_edge:
	+ edges[i >> 3] \|= 1 << (i & 7);
	+ }
	+ for (i = 0; i < n; i++) {
	+ v = (edges[i >> 3] >> (i & 7)) & 1;
	+ memcpy(buf + i * stream.pixel_size, colours[v], stream…
	+ }
	+ ewriteall(STDOUT_FILENO, buf, stream.frame_size, "<stdout>");
	+ }
	+
	+ free(buf);
	+ free(edges);
	+ return 0;
	+}