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	add ff2ppm(1) - farbfeld - suckless image format with conversion tools
	git clone git://git.suckless.org/farbfeld
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	---
	commit dc512d040c7d081ed96b1919420aebd646968879
	parent e637aae67ededf6a4a0b4d490d02f3294f297b71
	Author: Hiltjo Posthuma <[email protected]>
	Date: Mon, 21 Mar 2016 21:06:06 +0100

	add ff2ppm(1)

	ff2ppm can convert farbfeld images to PPM (P6 binary format, 24-bit RGB).
	ff2ppm has an option -b to set the background color, for example for png files:

	png2ff < test.png \| ff2ppm -b '#00ff00' > test.ppm

	Diffstat:
	M Makefile \| 7 ++++---
	A ff2ppm.1 \| 48 +++++++++++++++++++++++++++++…
	A ff2ppm.c \| 125 +++++++++++++++++++++++++++++…

	3 files changed, 177 insertions(+), 3 deletions(-)
	---
	diff --git a/Makefile b/Makefile
	@@ -2,12 +2,13 @@
	# See LICENSE file for copyright and license details
	include config.mk

	-BIN = png2ff ff2png jpg2ff
	+BIN = png2ff ff2png jpg2ff ff2ppm
	SRC = ${BIN:=.c}
	+HDR = arg.h
	MAN1 = 2ff.1 ${BIN:=.1}
	MAN5 = farbfeld.5

	-all: png2ff ff2png jpg2ff
	+all: png2ff ff2png jpg2ff ff2ppm

	.c:
	@echo CC $<
	@@ -21,7 +22,7 @@ dist: clean
	@echo creating dist tarball
	@mkdir -p farbfeld-${VERSION}
	@cp -R FORMAT LICENSE Makefile README TODO config.mk \
	- 2ff ${SRC} ${MAN1} ${MAN5} farbfeld-${VERSION}
	+ 2ff ${HDR} ${SRC} ${MAN1} ${MAN5} farbfeld-${VERSION}
	@tar -cf farbfeld-${VERSION}.tar farbfeld-${VERSION}
	@gzip farbfeld-${VERSION}.tar
	@rm -rf farbfeld-${VERSION}
	diff --git a/ff2ppm.1 b/ff2ppm.1
	@@ -0,0 +1,48 @@
	+.Dd 2016-03-21
	+.Dt FF2PPM 1
	+.Os suckless.org
	+.Sh NAME
	+.Nm ff2ppm
	+.Nd convert farbfeld to PPM (binary)
	+.Sh SYNOPSIS
	+.Nm
	+.Op Fl b Ar color
	+.Sh DESCRIPTION
	+.Nm
	+reads a
	+.Xr farbfeld 5
	+image from stdin, converts it to a PPM image (P6 binary format, RGB) and
	+writes the result to stdout.
	+.Pp
	+In case of an error
	+.Nm
	+writes a diagnostic message to stderr.
	+.Sh OPTIONS
	+.Bl -tag -width Ds
	+.It Fl b Ar color
	+.Ar color
	+to mix with the background alpha channel, the default is white.
	+.Pp
	+The following formats are supported:
	+"#rrggbb", "#rrrrggggbbbb" and the short-form "#rgb" which expands to "#rrggbb…
	+.El
	+.Sh EXIT STATUS
	+.Bl -tag -width Ds
	+.It 0
	+Image processed successfully.
	+.It 1
	+An error occurred.
	+.El
	+.Sh EXAMPLES
	+$
	+png2ff < test.png \|
	+.Nm
	+-b '#00ff00' > test.ppm
	+.Sh SEE ALSO
	+.Xr 2ff 1 ,
	+.Xr bunzip2 1 ,
	+.Xr bzip2 1 ,
	+.Xr png2ff 1 ,
	+.Xr farbfeld 5
	+.Sh AUTHORS
	+.An Hiltjo Posthuma Aq Mt [email protected]
	diff --git a/ff2ppm.c b/ff2ppm.c
	@@ -0,0 +1,125 @@
	+/* See LICENSE file for copyright and license details. */
	+#include <arpa/inet.h>
	+
	+#include <errno.h>
	+#include <inttypes.h>
	+#include <stdint.h>
	+#include <stdio.h>
	+#include <stdlib.h>
	+#include <string.h>
	+
	+#include "arg.h"
	+
	+char *argv0;
	+
	+static void
	+usage(void)
	+{
	+ fprintf(stderr, "usage: %s [-b #rrggbb]\n", argv0);
	+ exit(1);
	+}
	+
	+int
	+main(int argc, char *argv[])
	+{
	+ size_t rowlen;
	+ uint32_t hdr[4], width, height, i, j, k;
	+ uint16_t *row, mr = 0xffff, mg = 0xffff, mb = 0xffff;
	+ uint8_t *rowout;
	+ char *color;
	+ unsigned int r = 0xff, g = 0xff, b = 0xff;
	+ float a;
	+
	+ argv0 = argv[0];
	+ ARGBEGIN {
	+ case 'b':
	+ for (color = EARGF(usage()); color && color == '#'; color++)
	+ ;
	+
	+ switch (strlen(color)) {
	+ case 3:
	+ if (sscanf(color, "%1x%1x%1x", &r, &g, &b) != 3)
	+ usage();
	+ mr = (r \| r << 4) * 257;
	+ mg = (g \| g << 4) * 257;
	+ mb = (b \| b << 4) * 257;
	+ break;
	+ case 6:
	+ if (sscanf(color, "%2x%2x%2x", &r, &g, &b) != 3)
	+ usage();
	+ mr = r * 257;
	+ mg = g * 257;
	+ mb = b * 257;
	+ break;
	+ case 12:
	+ if (sscanf(color, "%4x%4x%4x", &r, &g, &b) != 3)
	+ usage();
	+ mr = r;
	+ mg = g;
	+ mb = b;
	+ break;
	+ default:
	+ usage();
	+ }
	+ break;
	+ default:
	+ usage();
	+ } ARGEND
	+
	+ if (argc)
	+ usage();
	+
	+ /* header */
	+ if (fread(hdr, sizeof(*hdr), 4, stdin) != 4) {
	+ fprintf(stderr, "%s: fread: %s\n", argv0, strerror(errno));
	+ return 1;
	+ }
	+ if (memcmp("farbfeld", hdr, sizeof("farbfeld") - 1)) {
	+ fprintf(stderr, "%s: invalid magic value\n", argv0);
	+ return 1;
	+ }
	+ if (!(width = ntohl(hdr[2]))) {
	+ fprintf(stderr, "%s: invalid width: zero\n", argv0);
	+ return 1;
	+ }
	+ if (!(height = ntohl(hdr[3]))) {
	+ fprintf(stderr, "%s: invalid height: zero\n", argv0);
	+ return 1;
	+ }
	+ if (width > SIZE_MAX / ((sizeof("RGBA") - 1) * sizeof(uint16_t))) {
	+ fprintf(stderr, "%s: row length integer overflow\n", argv0);
	+ return 1;
	+ }
	+
	+ rowlen = width * (sizeof("RGBA") - 1);
	+ if (!(row = malloc(rowlen * sizeof(uint16_t)))) {
	+ fprintf(stderr, "%s: malloc: %s\n", argv0, strerror(errno));
	+ return 1;
	+ }
	+ if (!(rowout = malloc(width * sizeof("RGB") - 1))) {
	+ fprintf(stderr, "%s: malloc: %s\n", argv0, strerror(errno));
	+ return 1;
	+ }
	+
	+ /* PPM binary */
	+ printf("P6\n%" PRIu32 " %" PRIu32 "\n255\n", width, height);
	+
	+ /* write rows */
	+ for (i = 0; i < height; ++i) {
	+ if (fread(row, sizeof(uint16_t), rowlen, stdin) != rowlen) {
	+ fprintf(stderr, "%s: fread: %s\n", argv0, strerror(err…
	+ return 1;
	+ }
	+ for (j = 0, k = 0; j < rowlen; j += 4, k += 3) {
	+ a = ntohs(row[j + 3]) / 65535.0f;
	+ rowout[k] = ((ntohs(row[j]) * a) + (mr * (1 - …
	+ rowout[k + 1] = ((ntohs(row[j + 1]) * a) + (mg * (1 - …
	+ rowout[k + 2] = ((ntohs(row[j + 2]) * a) + (mb * (1 - …
	+ }
	+ if (fwrite(rowout, 3, width, stdout) != width) {
	+ fprintf(stderr, "%s: fwrite: %s\n", argv0, strerror(er…
	+ return 1;
	+ }
	+ }
	+ return 0;
	+}