shithub: ifilter

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avoid a call to loadmemimage/writememimage

	Instead of loading then writing the image we directly
	dump the buffer with the correct image(6) header.

	Thanks to qwx for the tip.

--- a/ifilter.c

+++ b/ifilter.c

@@ -121,12 +121,11 @@

 		sysfatal("malloc: %r");

 	if(unloadmemimage(i, i->r, buf, n)<0)

 		sysfatal("unloadmemimage: %r");

+	freememimage(i);

 	for(p = 0; p < n; p+=4)

 		f->filter(buf+p, factor);

-	if(loadmemimage(i, i->r, buf, n)<0)

-		sysfatal("unloadmemimage: %r");

-	writememimage(1, i);

-	freememimage(i);

+	print("   x8r8g8b8 %11d %11d %11d %11d ", 0, 0, w, h);

+	write(1, buf, n);

 	exits(nil);

 }