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	blind-unpremultiply.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	blind-unpremultiply.c (1433B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #ifndef TYPE
	3 #include "common.h"
	4
	5 USAGE("[-xyz]")
	6
	7 static int skip_x = 0;
	8 static int skip_y = 0;
	9 static int skip_z = 0;
	10
	11 #define FILE "blind-unpremultiply.c"
	12 #include "define-functions.h"
	13
	14 int
	15 main(int argc, char *argv[])
	16 {
	17 struct stream stream;
	18 void (process)(struct stream stream);
	19
	20 ARGBEGIN {
	21 case 'x':
	22 skip_x = 1;
	23 break;
	24 case 'y':
	25 skip_y = 1;
	26 break;
	27 case 'z':
	28 skip_z = 1;
	29 break;
	30 default:
	31 usage();
	32 } ARGEND;
	33
	34 if (argc)
	35 usage();
	36
	37 eopen_stream(&stream, NULL);
	38
	39 SELECT_PROCESS_FUNCTION(&stream);
	40 CHECK_CHANS(&stream, == 3, == stream.luma_chan);
	41 CHECK_N_CHAN(&stream, 4, 4);
	42
	43 fprint_stream_head(stdout, &stream);
	44 efflush(stdout, "<stdout>");
	45 process(&stream);
	46 return 0;
	47 }
	48
	49 #else
	50
	51 static void
	52 PROCESS(struct stream *stream)
	53 {
	54 size_t i, n;
	55 TYPE a;
	56 do {
	57 n = stream->ptr / stream->pixel_size;
	58 for (i = 0; i < n; i++) {
	59 a = ((TYPE )(stream->buf))[4 i + 3];
	60 if (!a)
	61 continue;
	62 if (!skip_x)
	63 ((TYPE )(stream->buf))[4 i + 0] /= a;
	64 if (!skip_y)
	65 ((TYPE )(stream->buf))[4 i + 1] /= a;
	66 if (!skip_z)
	67 ((TYPE )(stream->buf))[4 i + 2] /= a;
	68 }
	69 n *= stream->pixel_size;
	70 ewriteall(STDOUT_FILENO, stream->buf, n, "<stdout>");
	71 memmove(stream->buf, stream->buf + n, stream->ptr -= n);
	72 } while (eread_stream(stream, SIZE_MAX));
	73 if (stream->ptr)
	74 eprintf("%s: incomplete frame\n", stream->file);
	75 }
	76
	77 #endif