GopherProxy

	blind-stack.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-stack.c (2685B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("[-bs] bottom-stream ... top-stream")
	5
	6 #define PROCESS(TYPE, BLEND)\
	7 do {\
	8 TYPE x1, y1, z1, a1;\
	9 TYPE x2, y2, z2, a2;\
	10 size_t i, j;\
	11 for (i = 0; i < n; i += streams->pixel_size) {\
	12 x1 = ((TYPE *)(streams[0].buf + i))[0];\
	13 y1 = ((TYPE *)(streams[0].buf + i))[1];\
	14 z1 = ((TYPE *)(streams[0].buf + i))[2];\
	15 a1 = ((TYPE *)(streams[0].buf + i))[3];\
	16 for (j = 1; j < n_streams; j++) {\
	17 x2 = ((TYPE *)(streams[j].buf + i))[0];\
	18 y2 = ((TYPE *)(streams[j].buf + i))[1];\
	19 z2 = ((TYPE *)(streams[j].buf + i))[2];\
	20 a2 = ((TYPE *)(streams[j].buf + i))[3];\
	21 if (BLEND)\
	22 a2 /= (TYPE)(j + 1);\
	23 a1 *= 1 - a2;\
	24 x1 = x1 * a1 + x2 * a2;\
	25 y1 = y1 * a1 + y2 * a2;\
	26 z1 = z1 * a1 + z2 * a2;\
	27 a1 += a2;\
	28 }\
	29 ((TYPE *)(streams[0].buf + i))[0] = x1;\
	30 ((TYPE *)(streams[0].buf + i))[1] = y1;\
	31 ((TYPE *)(streams[0].buf + i))[2] = z1;\
	32 ((TYPE *)(streams[0].buf + i))[3] = a1;\
	33 }\
	34 } while (0)
	35
	36 static void process_lf (struct stream *streams, size_t n_streams, size_…
	37 static void process_lf_b(struct stream *streams, size_t n_streams, size_…
	38 static void process_f (struct stream *streams, size_t n_streams, size_…
	39 static void process_f_b (struct stream *streams, size_t n_streams, size_…
	40
	41 int
	42 main(int argc, char *argv[])
	43 {
	44 struct stream *streams;
	45 size_t n_streams, i, frames = 0, tmp;
	46 int blend = 0, shortest = 0;
	47 void (process)(struct stream streams, size_t n_streams, size_t…
	48
	49 ARGBEGIN {
	50 case 'b':
	51 blend = 1;
	52 break;
	53 case 's':
	54 shortest = 1;
	55 frames = SIZE_MAX;
	56 break;
	57 default:
	58 usage();
	59 } ARGEND;
	60
	61 if (argc < 2)
	62 usage();
	63
	64 n_streams = (size_t)argc;
	65 streams = ecalloc(n_streams, sizeof(*streams));
	66
	67 for (i = 0; i < n_streams; i++) {
	68 eopen_stream(streams + i, argv[i]);
	69 if (shortest ?
	70 (streams[i].frames && streams[i].frames < frames) :
	71 (streams[i].frames \|\| streams[i].frames > frames))
	72 frames = streams[i].frames;
	73 }
	74
	75 if (streams->encoding == DOUBLE)
	76 process = blend ? process_lf_b :process_lf;
	77 else if (streams->encoding == FLOAT)
	78 process = blend ? process_f_b : process_f;
	79 else
	80 eprintf("pixel format %s is not supported, try xyza\n", …
	81 CHECK_ALPHA_CHAN(streams);
	82 CHECK_N_CHAN(streams, 4, 4);
	83
	84 tmp = streams->frames, streams->frames = frames;
	85 fprint_stream_head(stdout, streams);
	86 efflush(stdout, "<stdout>");
	87 streams->frames = tmp;
	88 process_multiple_streams(streams, n_streams, STDOUT_FILENO, "<st…
	89
	90 free(streams);
	91 return 0;
	92 }