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	blind-transition.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-transition.c (2753B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("[-ir] [-s softness-stream]")
	5
	6 static size_t fm;
	7 static double fm_double;
	8 static float fm_float;
	9 static int reverse = 0;
	10 static int invert = 0;
	11 static const char *softness_file = NULL;
	12 static struct stream softness;
	13
	14 #define PROCESS(TYPE)\
	15 do {\
	16 size_t i, j = 0;\
	17 TYPE a, s, t = fm ? (TYPE)(reverse ? fm - f : f) / fm_##…
	18 if (!softness_file) {\
	19 for (i = 0; i < n; i += stream->pixel_size) {\
	20 a = ((TYPE *)(stream->buf + i))[1];\
	21 if (invert)\
	22 a = (TYPE)1 - a;\
	23 a = (TYPE)(a >= t);\
	24 ((TYPE )(stream->buf + i))[0] = a (TY…
	25 ((TYPE *)(stream->buf + i))[1] = a;\
	26 ((TYPE )(stream->buf + i))[2] = a (TY…
	27 ((TYPE *)(stream->buf + i))[3] = 1;\
	28 }\
	29 } else {\
	30 for (i = 0; i < n; i += stream->pixel_size, j +=…
	31 while (j + softness.pixel_size > softnes…
	32 memmove(softness.buf, softness.b…
	33 j = 0;\
	34 if (!eread_stream(&softness, SIZ…
	35 return;\
	36 }\
	37 s = ((TYPE *)(softness.buf + j))[1];\
	38 s = ((TYPE )(softness.buf + j))[3];\
	39 a = ((TYPE *)(stream->buf + i))[1];\
	40 if (invert)\
	41 a = (TYPE)1 - a;\
	42 a = (a / (1 + 2 * s) + s - t) / s;\
	43 a = a < 0 ? (TYPE)0 : a > 1 ? (TYPE)1 : …
	44 ((TYPE )(stream->buf + i))[0] = a (TY…
	45 ((TYPE *)(stream->buf + i))[1] = a;\
	46 ((TYPE )(stream->buf + i))[2] = a (TY…
	47 ((TYPE *)(stream->buf + i))[3] = 1;\
	48 }\
	49 }\
	50 } while (0)
	51
	52 static void process_lf(struct stream *stream, size_t n, size_t f) {PROCE…
	53 static void process_f (struct stream *stream, size_t n, size_t f) {PROCE…
	54
	55 int
	56 main(int argc, char *argv[])
	57 {
	58 struct stream stream;
	59 void (process)(struct stream stream, size_t n, size_t f);
	60
	61 ARGBEGIN {
	62 case 'i':
	63 invert = 1;
	64 break;
	65 case 'r':
	66 reverse = 1;
	67 break;
	68 case 's':
	69 softness_file = UARGF();
	70 break;
	71 default:
	72 usage();
	73 } ARGEND;
	74
	75 if (argc)
	76 usage();
	77
	78 eopen_stream(&stream, NULL);
	79 if (softness_file) {
	80 eopen_stream(&softness, softness_file);
	81 echeck_compat(&stream, &softness);
	82 }
	83
	84 CHECK_ALPHA(&stream);
	85 CHECK_COLOUR_SPACE(&stream, CIEXYZ);
	86 if (stream.encoding == DOUBLE)
	87 process = process_lf;
	88 else if (stream.encoding == FLOAT)
	89 process = process_f;
	90 else
	91 eprintf("pixel format %s is not supported, try xyza\n", …
	92
	93 if (!stream.frames)
	94 eprintf("video's length is not recorded");
	95
	96 fprint_stream_head(stdout, &stream);
	97 efflush(stdout, "<stdout>");
	98 fm_double = (double)(fm = stream.frames - 1);
	99 fm_float = (float)fm_double;
	100 process_each_frame_segmented(&stream, STDOUT_FILENO, "<stdout>",…
	101 return 0;
	102 }