blind

commit 8a2f7656c100fe9062782977ec5c82212d092ab9
parent 5c3968e6eda6583e9e2776be55e8d9af285e01a8
Author: Mattias Andrée <maandree@kth.se>
Date:   Fri, 14 Jul 2017 00:32:31 +0200

Add blind-mosaic-edges

Signed-off-by: Mattias Andrée <maandree@kth.se>

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.pixfmt);
+	}
+
+	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.pixel_size))
+				goto at_edge;
+
+			if (tiled_x && x == stream.width - 1 &&
+			    memcmp(here + stream.pixel_size - stream.row_size, here, stream.pixel_size))
+				goto at_edge;
+
+			if (x &&
+			    memcmp(here - stream.pixel_size, here, stream.pixel_size))
+				goto at_edge;
+
+			if (tiled_x && !x &&
+			    memcmp(here + stream.row_size - stream.pixel_size, here, stream.pixel_size))
+				goto at_edge;
+
+			if (y != stream.height - 1 &&
+			    memcmp(here + stream.row_size, here, stream.pixel_size))
+				goto at_edge;
+
+			if (tiled_y && y == stream.height - 1 &&
+			    memcmp(here + stream.row_size - stream.frame_size, here, stream.pixel_size))
+				goto at_edge;
+
+			if (y &&
+			    memcmp(here - stream.row_size, here, stream.pixel_size))
+				goto at_edge;
+
+			if (tiled_y && !y &&
+			    memcmp(here + stream.frame_size - stream.row_size, here, stream.pixel_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.pixel_size);
+		}
+		ewriteall(STDOUT_FILENO, buf, stream.frame_size, "<stdout>");
+	}
+
+	free(buf);
+	free(edges);
+	return 0;
+}