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	blind-spatial-arithm.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	blind-spatial-arithm.c (2546B)
	---
	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);
	8
	9 #define LIST_OPERATORS(PIXFMT, TYPE)\
	10 X(add, img[j & 3] + *buf, PIXFMT, TYPE)\
	11 X(mul, img[j & 3] * *buf, PIXFMT, TYPE)\
	12 X(min, MIN(img[j & 3], *buf), PIXFMT, TYPE)\
	13 X(max, MAX(img[j & 3], *buf), PIXFMT, TYPE)
	14
	15 #define X(NAME, ALGO, PIXFMT, TYPE)\
	16 static void\
	17 process_##PIXFMT##_##NAME(struct stream *stream)\
	18 {\
	19 TYPE img[4], *buf;\
	20 size_t i, n, j = 0, m = stream->frame_size / sizeof(*img…
	21 int first = 1;\
	22 do {\
	23 n = stream->ptr / stream->pixel_size * stream->n…
	24 buf = (TYPE *)(stream->buf);\
	25 for (i = 0; i < n; i++, buf++, j++, j %= m) {\
	26 if (!j) {\
	27 if (!first)\
	28 ewriteall(STDOUT_FILENO,…
	29 first = 0;\
	30 img[0] = *buf++;\
	31 img[1] = *buf++;\
	32 img[2] = *buf++;\
	33 img[3] = *buf;\
	34 i += 3;\
	35 j = 3;\
	36 } else {\
	37 img[j & 3] = ALGO;\
	38 }\
	39 }\
	40 n *= sizeof(TYPE);\
	41 memmove(stream->buf, stream->buf + n, stream->pt…
	42 } while (eread_stream(stream, SIZE_MAX));\
	43 if (!first)\
	44 ewriteall(STDOUT_FILENO, img, sizeof(img), "<std…
	45 }
	46 LIST_OPERATORS(lf, double)
	47 LIST_OPERATORS(f, float)
	48 #undef X
	49
	50 static process_func
	51 get_process_lf(const char *operation)
	52 {
	53 #define X(NAME, _ALGO, PIXFMT, TYPE)\
	54 if (!strcmp(operation, #NAME)) return process_##PIXFMT##_##NAME;
	55 LIST_OPERATORS(lf, double)
	56 #undef X
	57 eprintf("algorithm not recognised: %s\n", operation);
	58 return NULL;
	59 }
	60
	61 static process_func
	62 get_process_f(const char *operation)
	63 {
	64 #define X(NAME, _ALGO, PIXFMT, TYPE)\
	65 if (!strcmp(operation, #NAME)) return process_##PIXFMT##_##NAME;
	66 LIST_OPERATORS(f, float)
	67 #undef X
	68 eprintf("algorithm not recognised: %s\n", operation);
	69 return NULL;
	70 }
	71
	72 int
	73 main(int argc, char *argv[])
	74 {
	75 struct stream stream;
	76 process_func process;
	77
	78 UNOFLAGS(argc != 1);
	79
	80 eopen_stream(&stream, NULL);
	81 echeck_dimensions(&stream, WIDTH \| HEIGHT, NULL);
	82
	83 CHECK_N_CHAN(&stream, 4, 4);
	84 if (stream.encoding == DOUBLE)
	85 process = get_process_lf(argv[0]);
	86 else if (stream.encoding == FLOAT)
	87 process = get_process_f(argv[0]);
	88 else
	89 eprintf("pixel format %s is not supported, try xyza\n", …
	90
	91 if (DPRINTF_HEAD(STDOUT_FILENO, stream.frames, 1, 1, stream.pixf…
	92 eprintf("dprintf:");
	93 process(&stream);
	94 if (stream.ptr)
	95 eprintf("%s: incomplete frame\n", stream.file);
	96 return 0;
	97 }