blind-transition.c - blind - suckless command-line video editing utility
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blind-transition.c (2753B)
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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_##TYPE : (TYPE)0.5;\
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 * (TYPE)D65_XYZ_X;\
25 ((TYPE *)(stream->buf + i))[1] = a;\
26 ((TYPE *)(stream->buf + i))[2] = a * (TYPE)D65_XYZ_Z;\
27 ((TYPE *)(stream->buf + i))[3] = 1;\
28 }\
29 } else {\
30 for (i = 0; i < n; i += stream->pixel_size, j += softness.pixel_size) {\
31 while (j + softness.pixel_size > softness.ptr) {\
32 memmove(softness.buf, softness.buf + j, softness.ptr -= j);\
33 j = 0;\
34 if (!eread_stream(&softness, SIZE_MAX))\
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 : a;\
44 ((TYPE *)(stream->buf + i))[0] = a * (TYPE)D65_XYZ_X;\
45 ((TYPE *)(stream->buf + i))[1] = a;\
46 ((TYPE *)(stream->buf + i))[2] = a * (TYPE)D65_XYZ_Z;\
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) {PROCESS(double);}
53 static void process_f (struct stream *stream, size_t n, size_t f) {PROCESS(float);}
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", stream.pixfmt);
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>", process);
101 return 0;
102 }