blind

suckless command-line video editing utility
git clone git://git.suckless.org/blind
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commit 88752940275b41cf4b8c978f226ff7d55a5f6575
parent 6128aa893ef5180be5280c7e8185bfee85a00a73
Author: Mattias Andrée <maandree@kth.se>
Date:   Wed,  5 Jul 2017 00:07:13 +0200

Add blind-extract-alpha

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

Diffstat:
Makefile | 1+
README | 3+++
man/blind-extract-alpha.1 | 20++++++++++++++++++++
man/blind-set-alpha.1 | 3++-
man/blind.7 | 3+++
src/blind-extract-alpha.c | 62++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/stream.c | 7+++++++
src/stream.h | 1+
8 files changed, 99 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile @@ -21,6 +21,7 @@ BIN =\ blind-dot-product\ blind-double-sine-wave\ blind-extend\ + blind-extract-alpha\ blind-find-rectangle\ blind-flip\ blind-flop\ diff --git a/README b/README @@ -63,6 +63,9 @@ UTILITIES blind-extend(1) Add margins to a video + blind-extract-alpha(1) + Split a video into an alpha mask video and a colour mask video + blind-find-rectangle(1) Locate a coloured rectangle diff --git a/man/blind-extract-alpha.1 b/man/blind-extract-alpha.1 @@ -0,0 +1,20 @@ +.TH BLIND-EXTRACT-ALPHA 1 blind +.SH NAME +blind-extract-alpha - Split a video into an alpha mask video and a colour mask video +.SH SYNOPSIS +.B blind-extract-alpha +.I colour-file +.SH DESCRIPTION +.B blind-split +reads a video from stdin and writes the same video, +except fully opaque, to +.IR colour-file , +and writes a fully opaque video to stdout where +the colour channels have the values from the alpha +channel from the video in stdin. +.SH SEE ALSO +.BR blind (7), +.BR blind-set-alpha (7) +.SH AUTHORS +Mattias Andrée +.RI < maandree@kth.se > diff --git a/man/blind-set-alpha.1 b/man/blind-set-alpha.1 @@ -35,7 +35,8 @@ alpha value. .BR blind-arithm (1), .BR blind-set-luma (1), .BR blind-invert-luma (1), -.BR blind-set-saturation (1) +.BR blind-set-saturation (1), +.BR blind-extract-alpha (1) .SH AUTHORS Mattias Andrée .RI < maandree@kth.se > diff --git a/man/blind.7 b/man/blind.7 @@ -79,6 +79,9 @@ Apply double-sine-wave repetition to gradient .BR blind-extend (1) Add margins to a video .TP +.BR blind-extract-alpha (1) +Split a video into an alpha mask video and a colour mask video +.TP .BR blind-find-rectangle (1) Locate a coloured rectangle .TP diff --git a/src/blind-extract-alpha.c b/src/blind-extract-alpha.c @@ -0,0 +1,62 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + +USAGE("colour-file") + +#define PROCESS(TYPE, SUFFIX)\ + static void\ + process_##SUFFIX(struct stream *stream, int fd, const char *fname)\ + {\ + char buf[sizeof(stream->buf)];\ + size_t i, n;\ + TYPE a;\ + do {\ + n = stream->ptr / stream->pixel_size;\ + for (i = 0; i < n; i++) {\ + a = ((TYPE *)(stream->buf))[4 * i + 3];\ + ((TYPE *)(stream->buf))[4 * i + 3] = 1;\ + ((TYPE *)buf)[4 * i + 0] = a;\ + ((TYPE *)buf)[4 * i + 1] = a;\ + ((TYPE *)buf)[4 * i + 2] = a;\ + ((TYPE *)buf)[4 * i + 3] = 1;\ + }\ + n *= stream->pixel_size;\ + ewriteall(fd, stream->buf, n, fname);\ + ewriteall(STDOUT_FILENO, buf, n, "<stdout>");\ + memmove(stream->buf, stream->buf + n, stream->ptr -= n);\ + } while (eread_stream(stream, SIZE_MAX));\ + if (stream->ptr)\ + eprintf("%s: incomplete frame\n", stream->file);\ + } + +PROCESS(double, lf) +PROCESS(float, f) + + +int +main(int argc, char *argv[]) +{ + struct stream stream; + int fd; + void (*process)(struct stream *stream, int fd, const char *fname); + + UNOFLAGS(argc != 1); + + eopen_stream(&stream, NULL); + fd = eopen(argv[0], O_WRONLY | O_CREAT | O_TRUNC, 0666); + + if (!strcmp(stream.pixfmt, "xyza")) + process = process_lf; + else if (!strcmp(stream.pixfmt, "xyza f")) + process = process_f; + else + eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt); + + fprint_stream_head(stdout, &stream); + efflush(stdout, "<stdout>"); + if (dprint_stream_head(fd, &stream) < 0) + eprintf("dprintf %s:", argv[0]); + + process(&stream, fd, argv[0]); + return 0; +} diff --git a/src/stream.c b/src/stream.c @@ -123,6 +123,13 @@ fprint_stream_head(FILE *fp, struct stream *stream) } +int +dprint_stream_head(int fd, struct stream *stream) +{ + return DPRINTF_HEAD(fd, stream->frames, stream->width, stream->height, stream->pixfmt); +} + + size_t enread_stream(int status, struct stream *stream, size_t n) { diff --git a/src/stream.h b/src/stream.h @@ -88,6 +88,7 @@ void enopen_stream(int status, struct stream *stream, const char *file); int set_pixel_size(struct stream *stream); void enset_pixel_size(int status, struct stream *stream); void fprint_stream_head(FILE *fp, struct stream *stream); +int dprint_stream_head(int fd, struct stream *stream); size_t enread_stream(int status, struct stream *stream, size_t n); void eninf_check_fd(int status, int fd, const char *file); void encheck_dimensions(int status, const struct stream *stream, enum dimension dimensions, const char *prefix);