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	blind-extend.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-extend.c (2504B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("[-l left] [-r right] [-a above] [-b below] [-t]")
	5
	6 int
	7 main(int argc, char *argv[])
	8 {
	9 struct stream stream;
	10 char buf, image;
	11 size_t m, imgw, imgh, rown;
	12 size_t xoff, yoff, h, x, y;
	13 size_t left = 0, right = 0, top = 0, bottom = 0;
	14 int tile = 0;
	15
	16 ARGBEGIN {
	17 case 'l':
	18 left = etozu_flag('l', UARGF(), 0, SIZE_MAX);
	19 break;
	20 case 'r':
	21 right = etozu_flag('r', UARGF(), 0, SIZE_MAX);
	22 break;
	23 case 'a':
	24 top = etozu_flag('a', UARGF(), 0, SIZE_MAX);
	25 break;
	26 case 'b':
	27 bottom = etozu_flag('b', UARGF(), 0, SIZE_MAX);
	28 break;
	29 case 't':
	30 tile = 1;
	31 break;
	32 default:
	33 usage();
	34 } ARGEND;
	35
	36 if (argc)
	37 usage();
	38
	39 eopen_stream(&stream, NULL);
	40
	41 echeck_dimensions(&stream, WIDTH \| HEIGHT, NULL);
	42 buf = emalloc(stream.frame_size);
	43
	44 if (stream.width > SIZE_MAX - left)
	45 eprintf("<stdout>: output video is too wide\n");
	46 imgw = stream.width + left;
	47 if (imgw > SIZE_MAX - right)
	48 eprintf("<stdout>: output video is too wide\n");
	49 imgw += right;
	50 if (stream.height > SIZE_MAX - top)
	51 eprintf("<stdout>: output video is too tall\n");
	52 imgh = stream.height + top;
	53 if (imgh > SIZE_MAX - bottom)
	54 eprintf("<stdout>: output video is too tall\n");
	55 imgh += bottom;
	56 echeck_dimensions_custom(imgw, imgh, 0, stream.pixel_size, "outp…
	57 m = imgh * (imgw *= stream.pixel_size);
	58 image = tile ? emalloc(m) : ecalloc(1, m);
	59
	60 stream.width += left + right;
	61 h = stream.height += top + bottom;
	62 fprint_stream_head(stdout, &stream);
	63 efflush(stdout, "<stdout>");
	64 stream.width -= left + right;
	65 stream.height -= top + bottom;
	66
	67 left *= stream.pixel_size;
	68 right *= stream.pixel_size;
	69 rown = stream.width * stream.pixel_size;
	70
	71 xoff = (rown - left % rown) % rown;
	72 yoff = (stream.height - top % stream.height) % stream.height;
	73
	74 while (eread_frame(&stream, buf)) {
	75 if (!tile) {
	76 for (y = 0; y < stream.height; y++)
	77 memcpy(image + left + (y + top) * imgw, …
	78 } else {
	79 for (y = 0; y < stream.height; y++)
	80 for (x = 0; x < imgw; x++)
	81 image[x + (y + top) * imgw] = bu…
	82 for (y = 0; y < top; y++)
	83 memcpy(image + y * imgw, image + ((y + y…
	84 for (y = top + stream.height; y < h; y++)
	85 memcpy(image + y * imgw, image + ((y + y…
	86 }
	87 ewriteall(STDOUT_FILENO, image, m, "<stdout>");
	88 }
	89
	90 free(buf);
	91 free(image);
	92 return 0;
	93 }