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-.Dd 2018-04-11
-.Dt FARBFELD 5
-.Os suckless.org
-.Sh NAME
-.Nm farbfeld
-.Nd suckless image format
-.Sh DESCRIPTION
-.Nm
-is a
-.Em lossless
-image format which is easy to parse, pipe and compress.
-It has the following format:
-.Bd -literal -offset left
-BYTES    DESCRIPTION
-8        "farbfeld" magic value
-4        32-Bit BE unsigned integer (width)
-4        32-Bit BE unsigned integer (height)
-[2222]   4*16-Bit BE unsigned integers [RGBA] / pixel, row-major
-.Ed
-.Pp
-The RGB-data should be sRGB for best interoperability and not
-alpha-premultiplied.
-.Sh USAGE
-.Nm
-provides the tools
-.Xr 2ff 1 ,
-.Xr jpg2ff 1 ,
-.Xr png2ff 1
-and
-.Xr ff2jpg 1 ,
-.Xr ff2pam 1 ,
-.Xr ff2png 1 ,
-.Xr ff2ppm 1
-to
-.Em convert
-to and from farbfeld images respectively.
-.Pp
-.Xr bzip2 1
-is recommended for
-.Em compression ,
-giving results comparable with PNG for photographs and much better results
-for other image types.
-.sp
-The
-.Em file extension
-is ".ff" and compression extensions shall be
-appended (e.g. ".ff.bz2").
-.Sh MOTIVATION
-.Nm
-was created because the author was not satisfied with the boilerplate
-and inherent complexity involved in handling common image formats
-(PNG, JPEG, GIF,...), having to rely on bloated libraries while not being
-able to focus on the task at hand for a given image processing problem.
-.Sh EXAMPLES
-The following code listing
-.Em invert.c
-is a ready-to-use color inverter with all necessary error handling and
-reporting. This program can be integrated into a farbfeld pipeline as
-follows:
-.Pp
-$ png2ff < image.png | invert | ff2png > image-inverted.png
-.Pp
-It shall be noted here that due to the simplicity of the format no
-external libraries are needed to handle the farbfeld image data. The
-0BSD-License gives you the freedom to throw away the license block and
-just use the code as you wish. Happy hacking!
-.Bd -literal -offset left
-/*
- * 0BSD-License
- *
- * (c) 2017 Laslo Hunhold <dev@frign.de>
- *
- * Permission to use, copy, modify, and/or distribute this software for
- * any purpose with or without fee is hereby granted.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
- * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
- * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
- * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
- * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
- * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- * PERFORMANCE OF THIS SOFTWARE.
- */
-#include <arpa/inet.h>
-
-#include <errno.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <string.h>
-
-#define LEN(x) (sizeof (x) / sizeof *(x))
-
-static void
-invert(uint16_t rgba[4])
-{
-	rgba[0] = UINT16_MAX - rgba[0];
-	rgba[1] = UINT16_MAX - rgba[1];
-	rgba[2] = UINT16_MAX - rgba[2];
-}
-
-int
-main(int argc, char *argv[])
-{
-	uint32_t hdr[4], width, height, i, j, k;
-	uint16_t rgba[4];
-
-	/* arguments */
-	if (argc != 1) {
-		fprintf(stderr, "usage: %s\\n", argv[0]);
-		return 1;
-	}
-
-	/* read header */
-	if (fread(hdr, sizeof(*hdr), LEN(hdr), stdin) != LEN(hdr)) {
-		goto readerr;
-	}
-	if (memcmp("farbfeld", hdr, sizeof("farbfeld") - 1)) {
-		fprintf(stderr, "%s: invalid magic value\\n", argv[0]);
-		return 1;
-	}
-	width = ntohl(hdr[2]);
-	height = ntohl(hdr[3]);
-
-	/* write data */
-	if (fwrite(hdr, sizeof(*hdr), LEN(hdr), stdout) != 4) {
-		goto writerr;
-	}
-
-	for (i = 0; i < height; i++) {
-		for (j = 0; j < width; j++) {
-			if (fread(rgba, sizeof(*rgba), LEN(rgba),
-			          stdin) != LEN(rgba)) {
-				goto readerr;
-			}
-			for (k = 0; k < 4; k++) {
-				rgba[k] = ntohs(rgba[k]);
-			}
-
-			invert(rgba);
-
-			for (k = 0; k < 4; k++) {
-				rgba[k] = htons(rgba[k]);
-			}
-			if (fwrite(rgba, sizeof(*rgba), LEN(rgba),
-			           stdout) != LEN(rgba)) {
-				goto writerr;
-			}
-		}
-	}
-
-	/* clean up */
-	if (fclose(stdout)) {
-		fprintf(stderr, "%s: fclose: %s\\n", argv[0],
-		        strerror(errno));
-		return 1;
-	}
-
-	return 0;
-readerr:
-	fprintf(stderr, "%s: fread: Unexpected EOF\\n", argv[0]);
-	return 1;
-writerr:
-	fprintf(stderr, "%s: fwrite: %s\\n", argv[0], strerror(errno));
-	return 1;
-}
-.Ed
-.Sh SEE ALSO
-.Xr 2ff 1 ,
-.Xr ff2jpg 1 ,
-.Xr ff2pam 1 ,
-.Xr ff2png 1 ,
-.Xr ff2ppm 1 ,
-.Xr jpg2ff 1 ,
-.Xr png2ff 1
-.Sh AUTHORS
-.An Laslo Hunhold Aq Mt dev@frign.de