blind

commit 6f4d55793f88540d1b1abd7410e43da83993ad6a
parent e7f1780c5c05840ec3eca54b83d76c2658bf5de8
Author: Mattias Andrée <maandree@kth.se>
Date:   Tue, 11 Jul 2017 23:27:46 +0200

Add blind-repeat-tessellation

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

Diffstat:
M
Makefile
 | 
1
+
M
README
 | 
3
+++
A
man/blind-repeat-tessellation.1
 | 
34
++++++++++++++++++++++++++++++++++
M
man/blind.7
 | 
3
+++
A
src/blind-repeat-tessellation.c
 | 
52
++++++++++++++++++++++++++++++++++++++++++++++++++++

5 files changed, 93 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
@@ -44,6 +44,7 @@ BIN =\
 	blind-radial-gradient\
 	blind-read-head\
 	blind-repeat\
+	blind-repeat-tessellation\
 	blind-reverse\
 	blind-rewrite-head\
 	blind-round-wave\
diff --git a/README b/README
@@ -132,6 +132,9 @@ UTILITIES
        blind-repeat(1)
               Repeat a video
 
+       blind-repeat-tessellation(1)
+              Repeat a video horizontally and veritically to a specific size
+
        blind-reverse(1)
               Reverse a video
 
diff --git a/man/blind-repeat-tessellation.1 b/man/blind-repeat-tessellation.1
@@ -0,0 +1,34 @@
+.TH BLIND-REPEAT-TESSELLATION 1 blind
+.SH NAME
+blind-repeat-tessellation - Repeat a video horizontally and veritically to a specific size
+.SH SYNOPSIS
+.B blind-repeat-tessellation
+-w
+.I width
+-h
+.I height
+.SH DESCRIPTION
+.B blind-repeat-tessellation
+reads a video from stdin and prints it, repeated both
+horizontally and vertically, to stdout.
+.SH OPTIONS
+.TP
+.BR -w " "\fIwidth\fP
+The width of the output video shall be exactly
+.I width
+pixels.
+.TP
+.BR -h " "\fIheight\fP
+The height of the output video shall be exactly
+.I height
+pixels.
+.SH REQUIREMENTS
+.B blind-repeat-tessellation
+requires enough free memory to load one full frame of
+the video from stdin into memory. A frame requires 32
+bytes per pixel it contains.
+.SH SEE ALSO
+.BR blind (7)
+.SH AUTHORS
+Mattias Andrée
+.RI < maandree@kth.se >
diff --git a/man/blind.7 b/man/blind.7
@@ -148,6 +148,9 @@ Reads the head from a video
 .BR blind-repeat (1)
 Repeat a video
 .TP
+.BR blind-repeat-tessellation (1)
+Repeat a video horizontally and veritically to a specific size
+.TP
 .BR blind-reverse (1)
 Reverse a video
 .TP
diff --git a/src/blind-repeat-tessellation.c b/src/blind-repeat-tessellation.c
@@ -0,0 +1,52 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+USAGE("-w width -h height")
+
+int
+main(int argc, char *argv[])
+{
+	struct stream stream;
+	size_t width = 0;
+	size_t height = 0;
+	size_t x, y, p, w;
+	char *buf;
+
+	ARGBEGIN {
+	case 'w':
+		width = etozu_flag('w', UARGF(), 1, SIZE_MAX);
+		break;
+	case 'h':
+		height = etozu_flag('h', UARGF(), 1, SIZE_MAX);
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	if (!width || !height || argc)
+		usage();
+
+	eopen_stream(&stream, NULL);
+	echeck_dimensions(&stream, WIDTH | HEIGHT, NULL);
+	x = stream.width,  stream.width = width;
+	y = stream.height, stream.height = height;
+	fprint_stream_head(stdout, &stream);
+	efflush(stdout, "<stdout>");
+	stream.width  = x;
+	stream.height = y;
+	buf = emalloc(stream.frame_size);
+
+	w = width % stream.width;
+	while (eread_frame(&stream, buf)) {
+		for (y = 0; y < height; y++) {
+			p = (y % stream.height) * stream.row_size;
+			for (x = 0; x < width / stream.width; x++)
+				ewriteall(STDOUT_FILENO, buf + p, stream.row_size, "<stdout>");
+			if (w)
+				ewriteall(STDOUT_FILENO, buf + p, w * stream.pixel_size, "<stdout>");
+		}
+	}
+
+	free(buf);
+	return 0;
+}