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	blind-temporal-arithm.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	blind-temporal-arithm.c (2413B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("operation")
	5
	6 /* Because the syntax for a function returning a function pointer is dis…
	7 typedef void (process_func)(struct stream stream, void *image);
	8
	9 #define LIST_OPERATORS(PIXFMT, TYPE)\
	10 X(add, img + buf, PIXFMT, TYPE)\
	11 X(mul, img *buf, PIXFMT, TYPE)\
	12 X(min, MIN(img, buf), PIXFMT, TYPE)\
	13 X(max, MAX(img, buf), PIXFMT, TYPE)
	14
	15 #define X(NAME, ALGO, PIXFMT, TYPE)\
	16 static void\
	17 process_##PIXFMT##_##NAME(struct stream stream, void image)\
	18 {\
	19 TYPE buf, img = image;\
	20 size_t i, n, j = 0, m = stream->frame_size / sizeof(TYPE…
	21 do {\
	22 n = stream->ptr / sizeof(TYPE);\
	23 buf = (TYPE *)(stream->buf);\
	24 for (i = 0; i < n; i++, buf++) {\
	25 *img = ALGO;\
	26 if (++j == m) {\
	27 j = 0;\
	28 img = image;\
	29 } else {\
	30 img++;\
	31 }\
	32 }\
	33 n *= sizeof(TYPE);\
	34 memmove(stream->buf, stream->buf + n, stream->pt…
	35 } while (eread_stream(stream, SIZE_MAX));\
	36 }
	37 LIST_OPERATORS(lf, double)
	38 LIST_OPERATORS(f, float)
	39 #undef X
	40
	41 static process_func
	42 get_process_lf(const char *operation)
	43 {
	44 #define X(NAME, _ALGO, PIXFMT, TYPE)\
	45 if (!strcmp(operation, #NAME)) return process_##PIXFMT##_##NAME;
	46 LIST_OPERATORS(lf, double)
	47 #undef X
	48 eprintf("algorithm not recognised: %s\n", operation);
	49 return NULL;
	50 }
	51
	52 static process_func
	53 get_process_f(const char *operation)
	54 {
	55 #define X(NAME, _ALGO, PIXFMT, TYPE)\
	56 if (!strcmp(operation, #NAME)) return process_##PIXFMT##_##NAME;
	57 LIST_OPERATORS(f, float)
	58 #undef X
	59 eprintf("algorithm not recognised: %s\n", operation);
	60 return NULL;
	61 }
	62
	63 int
	64 main(int argc, char *argv[])
	65 {
	66 struct stream stream;
	67 process_func process;
	68 char *img;
	69
	70 UNOFLAGS(argc != 1);
	71
	72 eopen_stream(&stream, NULL);
	73
	74 if (stream.encoding == DOUBLE)
	75 process = get_process_lf(argv[0]);
	76 else if (stream.encoding == FLOAT)
	77 process = get_process_f(argv[0]);
	78 else
	79 eprintf("pixel format %s is not supported, try xyza\n", …
	80
	81 echeck_dimensions(&stream, WIDTH \| HEIGHT, NULL);
	82 img = emalloc(stream.frame_size);
	83 if (!eread_frame(&stream, img))
	84 eprintf("video has no frames\n");
	85
	86 process(&stream, img);
	87 if (stream.ptr)
	88 eprintf("%s: incomplete frame\n", stream.file);
	89
	90 stream.frames = 1;
	91 fprint_stream_head(stdout, &stream);
	92 efflush(stdout, "<stdout>");
	93 ewriteall(STDOUT_FILENO, img, stream.frame_size, "<stdout>");
	94 free(img);
	95 return 0;
	96 }