better rounding in resize

TODO

@@ -4,7 +4,12 @@
 
 - try orc version of reducev?
 
-- still see rounding problems on resize, try ghibli3
+- try
+
+	$ vipsthumbnail ghibli_orig.jpg -s 600x1085
+	$ vipsheader tn_ghibli_orig.jpg 
+	tn_ghibli_orig.jpg: 599x1083 uchar, 3 bands, srgb, jpegload
+
 
 
 

libvips/resample/resize.c

@@ -136,12 +136,12 @@ vips_resize_build( VipsObject *object )
 	 * between our target size and the size we have after vips_shrink().
 	 *
 	 * Aim for a little above target so we can't round down below it.
+	 *
+	 * This can break the aspect ratio slightly :/ but hopefully no one
+	 * will notice.
 	 */
 	hresidual = ((double) target_width + 0.1) / in->Xsize;
-	if( vips_object_argument_isset( object, "vscale" ) ) 
-		vresidual = ((double) target_height + 0.1) / in->Ysize;
-	else
-		vresidual = hresidual;
+	vresidual = ((double) target_height + 0.1) / in->Ysize;
 
 	/* We want to make sure we read the image sequentially.
 	 * However, the convolution we may be doing later will force us