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show yuv→rgb delay

--- a/main.c

+++ b/main.c

@@ -234,8 +234,9 @@

 			case Cframe:

 				snprint(

 					info, sizeof(info),

-					"delay=%zdms %dx%d %s %s",

+					"yuv→rgb=%zdms display=%zdms %dx%d %s %s",

 					delay/1000000ULL,

+					yuv→rgb/1000000ULL,

 					frame->w, frame->h,

 					d->info,

 					d->s->info

--- a/misc.h

+++ b/misc.h

@@ -8,3 +8,4 @@

 extern int nproc;

 extern int debug;

+extern uvlong yuv→rgb;

--- a/yuv.c

+++ b/yuv.c

@@ -1,5 +1,8 @@

 #include <u.h>

+#include "misc.h"

+uvlong yuv→rgb;

+

 void yuv420_rgb24(

 	int width, int height,

 	u8int *y, u8int *u, u8int *v,

@@ -9,7 +12,9 @@

 	u32int w, h;

 	int r, g, b;

 	int yy, cb, cr, go;

+	uvlong start;

+	start = nanosec();

 	for(h = 0; h < height-1; h += 2){

 		for(w = 0; w < width-1; w += 2){

 			cb = *u - 0x80;

@@ -41,4 +46,5 @@

 		v += uvstride - w/2;

 		rgb += rgbstride*2 - 3*w;

 	}

+	yuv→rgb = nanosec() - start;

 }