shithub: riscv

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resize: add -n for nearest neighbour

--- a/sys/src/cmd/resize.c

+++ b/sys/src/cmd/resize.c

@@ -3,6 +3,8 @@

 #include <draw.h>

 #include <memdraw.h>

+int nflag;

+

 static void

 resample(Memimage *dst, Rectangle r, Memimage *src, Rectangle sr)

 {

@@ -29,6 +31,8 @@

 	for(dp.y=0; dp.y<=dsize.y; dp.y++){

 		sp.y = _sp.y>>12;

 		ty = _sp.y&0xFFF;

+		if(nflag)

+			ty = ty << 1 & 0x1000;

 		pdst = pdst0;

 		sp.x = sr.min.x;

 		psrc0 = byteaddr(src, sp);

@@ -36,6 +40,8 @@

 		for(dp.x=0; dp.x<=dsize.x; dp.x++){

 			sp.x = _sp.x>>12;

 			tx = _sp.x&0xFFF;

+			if(nflag)

+				tx = tx << 1 & 0x1000;

 			psrc = psrc0 + sp.x*bpp;

 			s00 = (0x1000-tx)*(0x1000-ty);

 			s01 = tx*(0x1000-ty);

@@ -108,6 +114,9 @@

 		break;

 	case 'y':

 		ysize = getsize(EARGF(usage()));

+		break;

+	case 'n':

+		nflag++;

 		break;

 	default:

 		usage();