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	blind-transpose.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-transpose.c (1379B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("")
	5
	6 static size_t srcw, srch, srcwps, srchps, ps, n;
	7
	8 #define PROCESS(TYPE)\
	9 do {\
	10 size_t x, i;\
	11 char src, img;\
	12 for (x = 0; x < srchps; x += ps) {\
	13 img = row + x;\
	14 src = col + x * srcw;\
	15 for (i = 0; i < n; i++)\
	16 ((TYPE )img)[i] = ((TYPE )src)[i];\
	17 }\
	18 } while (0)
	19
	20 static void process_long(char row, char col) {PROCESS(long);}
	21 static void process_char(char row, char col) {PROCESS(char);}
	22
	23 int
	24 main(int argc, char *argv[])
	25 {
	26 struct stream stream;
	27 char buf, image;
	28 size_t y;
	29 void (process)(char row, char *col);
	30
	31 UNOFLAGS(argc);
	32
	33 eopen_stream(&stream, NULL);
	34 echeck_dimensions(&stream, WIDTH \| HEIGHT, NULL);
	35 srch = stream.height, srchps = stream.col_size;
	36 srcw = stream.width, srcwps = stream.row_size;
	37 stream.height = srcw;
	38 stream.width = srch;
	39 fprint_stream_head(stdout, &stream);
	40 efflush(stdout, "<stdout>");
	41
	42 buf = emalloc(stream.frame_size);
	43 image = emalloc(srchps);
	44
	45 ps = stream.pixel_size;
	46 process = ps % sizeof(long) ? process_char : process_long;
	47 n = ps / (ps % sizeof(long) ? sizeof(char) : sizeof(long));
	48 while (eread_frame(&stream, buf)) {
	49 for (y = 0; y < srcwps; y += stream.pixel_size) {
	50 process(image, buf + y);
	51 ewriteall(STDOUT_FILENO, image, srchps, "<stdout…
	52 }
	53 }
	54
	55 free(buf);
	56 free(image);
	57 return 0;
	58 }