GopherProxy

	blind-apply-kernel.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
	Log
	Files
	Refs
	README
	LICENSE
	---
	blind-apply-kernel.c (3898B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #ifndef TYPE
	3 #include "common.h"
	4
	5 USAGE("[-apPxy] kernel-stream")
	6
	7 static int no_alpha = 0;
	8 static int dont_premultiply = 0;
	9 static int per_pixel = 0;
	10 static int wrap_x = 0;
	11 static int wrap_y = 0;
	12 static size_t kern_w;
	13 static size_t kern_h;
	14
	15 #define FILE "blind-apply-kernel.c"
	16 #include "define-functions.h"
	17
	18 int
	19 main(int argc, char *argv[])
	20 {
	21 struct stream colour, kernel;
	22 void (process)(struct stream colour, struct stream *kernel);
	23 size_t tmp;
	24
	25 ARGBEGIN {
	26 case 'a':
	27 no_alpha = 1;
	28 break;
	29 case 'p':
	30 per_pixel = 1;
	31 break;
	32 case 'P':
	33 dont_premultiply = 1;
	34 break;
	35 case 'x':
	36 wrap_x = 1;
	37 break;
	38 case 'y':
	39 wrap_y = 1;
	40 break;
	41 default:
	42 usage();
	43 } ARGEND;
	44
	45 if (argc != 1)
	46 usage();
	47
	48 eopen_stream(&colour, NULL);
	49 eopen_stream(&kernel, argv[0]);
	50
	51 SELECT_PROCESS_FUNCTION(&colour);
	52 CHECK_ALPHA_CHAN(&colour);
	53 CHECK_N_CHAN(&colour, 4, 4);
	54 if (colour.encoding != kernel.encoding \|\| colour.n_chan != kerne…
	55 eprintf("videos use incompatible pixel formats");
	56 if (per_pixel && !(kernel.width % colour.width \|\| kernel.height …
	57 eprintf("-p is specified but the dimensions of kernel-st…
	58 "are not multiples of the dimensions of stdin.");
	59
	60 kern_w = per_pixel ? kernel.width / colour.width : kernel.widt…
	61 kern_h = per_pixel ? kernel.height / colour.height : kernel.heig…
	62
	63 tmp = kernel.height, kernel.height = kern_h;
	64 echeck_dimensions(&colour, WIDTH \| HEIGHT, NULL);
	65 echeck_dimensions(&kernel, WIDTH \| HEIGHT, NULL);
	66 kernel.height = tmp;
	67
	68 fprint_stream_head(stdout, &colour);
	69 efflush(stdout, "<stdout>");
	70 process(&colour, &kernel);
	71 return 0;
	72 }
	73
	74 #else
	75
	76 static void
	77 PROCESS(struct stream colour, struct stream kernel)
	78 {
	79 TYPE out, clr, krn, kern, *pix;
	80 size_t i, x, y, n, x2, y2;
	81 ssize_t cx, cy, xoff, yoff;
	82
	83 out = emalloc(colour->frame_size);
	84 clr = emalloc(colour->frame_size);
	85 krn = emalloc2(kern_h, kernel->row_size);
	86
	87 xoff = (ssize_t)(kern_w / 2);
	88 yoff = (ssize_t)(kern_h / 2);
	89
	90 n = colour->width * colour->height * colour->n_chan;
	91 while (eread_frame(colour, clr)) {
	92 /* premultiply */
	93 if (!no_alpha && !dont_premultiply) {
	94 for (i = 0; i < n; i += 4) {
	95 clr[i + 0] *= clr[i + 3];
	96 clr[i + 1] *= clr[i + 3];
	97 clr[i + 2] *= clr[i + 3];
	98 }
	99 }
	100
	101 /* apply kernel */
	102 memset(out, 0, colour->frame_size);
	103 pix = out;
	104 for (y = 0; y < colour->height; y++) {
	105 if ((!y \|\| per_pixel) && !eread_segment(kernel, …
	106 goto done;
	107 for (x = 0; x < colour->width; x++, pix += colou…
	108 kern = per_pixel ? (krn + x * kern_w * k…
	109 for (y2 = 0; y2 < kern_h; y2++, kern += …
	110 cy = (ssize_t)(y + y2) - yoff;
	111 if (cy < 0 \|\| (size_t)cy >= colo…
	112 if (!wrap_y)
	113 continue;
	114 cy %= (ssize_t)(colour->…
	115 if (cy < 0)
	116 cy += (ssize_t)(…
	117 }
	118 for (x2 = 0; x2 < kern_w; x2++) {
	119 cx = (ssize_t)(x + x2) -…
	120 if (cx < 0 \|\| (size_t)cx…
	121 if (!wrap_x)
	122 continue;
	123 cx %= (ssize_t)(…
	124 if (cx < 0)
	125 cx += (s…
	126 }
	127 for (i = 0; i < colour->…
	128 pix[i] += kern[x…
	129 clr[((…
	130 }
	131 }
	132 }
	133 }
	134
	135 /* unpremultiply */
	136 if (!dont_premultiply) {
	137 for (i = 0; i < n; i += 4) {
	138 if (out[i + 3]) {
	139 out[i + 0] /= out[i + 3];
	140 out[i + 1] /= out[i + 3];
	141 out[i + 2] /= out[i + 3];
	142 }
	143 }
	144 }
	145
	146 /* ensure video is opaque if -a was used */
	147 if (no_alpha)
	148 for (i = 0; i < n; i += 4)
	149 out[i + 3] = 1;
	150
	151 /* output video */
	152 ewriteall(STDOUT_FILENO, out, colour->frame_size, "<stdo…
	153 }
	154 done:
	155
	156 free(out);
	157 free(clr);
	158 free(krn);
	159 }
	160
	161 #endif