wire up to resize / similarity

still need tests

ChangeLog

@@ -1,3 +1,7 @@
+29/1/16 started 8.3
+- add vips_reduce*() ... a fast path for bicubic downsize
+- vips_resize() and vips_similarity use it when they can
+
 12/1/16 started 8.2.2
 - changes to ease compiling C++ binding with MSVC [Lovell Fuller]
 - reorder file tests to put slow loaders last

TODO

@@ -45,9 +45,10 @@
   more small tweaks
 
 	$ time vipsthumbnail wtc.tif -o x.tif -s 7000
-	real	0m1.843s
-	user	0m6.040s
-	sys	0m0.252s
+	real	0m1.818s
+	user	0m5.956s
+	sys	0m0.296s
+
 
 
 - get some brightly coloured spots with nohalo / vsqbs on wobble.ws ... very

configure.ac

@@ -2,7 +2,7 @@
 
 # also update the version number in the m4 macros below
 
-AC_INIT([vips], [8.2.2], [vipsip@jiscmail.ac.uk])
+AC_INIT([vips], [8.3.0], [vipsip@jiscmail.ac.uk])
 # required for gobject-introspection
 AC_PREREQ(2.62)
 
@@ -17,8 +17,8 @@ AC_CONFIG_MACRO_DIR([m4])
 
 # user-visible library versioning
 m4_define([vips_major_version], [8])
-m4_define([vips_minor_version], [2])
-m4_define([vips_micro_version], [2])
+m4_define([vips_minor_version], [3])
+m4_define([vips_micro_version], [0])
 m4_define([vips_version],
           [vips_major_version.vips_minor_version.vips_micro_version])
 
@@ -37,9 +37,9 @@ VIPS_VERSION_STRING=$VIPS_VERSION-`date`
 #   binary interface changes backwards compatible?: increment age
 #   binary interface changes not backwards compatible?: reset age to 0
 
-LIBRARY_CURRENT=45
-LIBRARY_REVISION=2
-LIBRARY_AGE=3
+LIBRARY_CURRENT=46
+LIBRARY_REVISION=0
+LIBRARY_AGE=4
 
 # patched into include/vips/version.h
 AC_SUBST(VIPS_VERSION)

libvips/resample/reduce.c

@@ -73,38 +73,11 @@ vips_reduce_build( VipsObject *object )
 	if( VIPS_OBJECT_CLASS( vips_reduce_parent_class )->build( object ) )
 		return( -1 );
 
-	/*
-	if( vips_reduceh( resample->in, &t[0], reduce->xshrink, NULL ) ||
-		vips_linecache( t[0], &t[1], 
-			"tile_height", 4,
-			NULL ) ||
-		vips_reducev( t[1], &t[2], reduce->yshrink, NULL ) ||
-		vips_image_write( t[2], resample->out ) )
-		return( -1 );
-	*/
-
-	/*
-	if( vips_reducev( resample->in, &t[0], reduce->yshrink, NULL ) ||
-		vips_linecache( t[0], &t[1], 
-			"tile_height", 4,
-			NULL ) ||
-		vips_reduceh( t[1], &t[2], reduce->xshrink, NULL ) ||
-		vips_image_write( t[2], resample->out ) )
-		return( -1 );
-	*/
-
 	if( vips_reducev( resample->in, &t[0], reduce->yshrink, NULL ) ||
 		vips_reduceh( t[0], &t[1], reduce->xshrink, NULL ) ||
 		vips_image_write( t[1], resample->out ) )
 		return( -1 );
 
-	/*
-	if( vips_reduceh( resample->in, &t[0], reduce->xshrink, NULL ) ||
-		vips_reducev( t[0], &t[1], reduce->yshrink, NULL ) ||
-		vips_image_write( t[1], resample->out ) )
-		return( -1 );
-	 */
-
 	return( 0 );
 }
 

libvips/resample/resize.c

@@ -230,18 +230,26 @@ vips_resize_build( VipsObject *object )
 		vips_info( class->nickname, "%s interpolation", nickname );
 	}
 
-	/*
-	if( vips_affine( in, &t[3], hresidual, 0, 0, vresidual, 
-		"interpolate", resize->interpolate,
-		"idx", resize->idx,
-		"idy", resize->idy,
-		NULL ) )  
-		return( -1 );
+	/* We have a special path for bicubic, idx/idy == 0.
 	 */
-
-	if( vips_reduce( in, &t[3], 1.0 / hresidual, 1.0 / vresidual, NULL ) )  
-		return( -1 );
-
+	if( resize->interpolate &&
+		strcmp( VIPS_OBJECT_GET_CLASS( resize->interpolate )->nickname,
+			"bicubic" ) == 0 &&
+		resize->idx == 0.0 &&
+		resize->idy == 0.0 ) {
+		vips_info( class->nickname, "using fast path for residual" );
+		if( vips_reduce( in, &t[3], 
+			1.0 / hresidual, 1.0 / vresidual, NULL ) )  
+			return( -1 );
+	}
+	else {
+		if( vips_affine( in, &t[3], hresidual, 0, 0, vresidual, 
+			"interpolate", resize->interpolate,
+			"idx", resize->idx,
+			"idy", resize->idy,
+			NULL ) )  
+			return( -1 );
+	}
 	in = t[3];
 
 	/* If we are upsampling, don't sharpen. Also don't sharpen if we

libvips/resample/similarity.c

@@ -47,6 +47,7 @@
 #include <vips/intl.h>
 
 #include <math.h>
+#include <string.h>
 
 #include <vips/vips.h>
 
@@ -78,24 +79,43 @@ vips_similarity_build( VipsObject *object )
 	VipsImage **t = (VipsImage **) 
 		vips_object_local_array( object, 4 );
 
-	double a, b, c, d; 
-
 	if( VIPS_OBJECT_CLASS( vips_similarity_parent_class )->build( object ) )
 		return( -1 );
 
-	a = similarity->scale * cos( VIPS_RAD( similarity->angle ) ); 
-	b = similarity->scale * -sin( VIPS_RAD( similarity->angle ) );
-	c = -b;
-	d = a;
+	/* Use vips_reduce(), if we can.
+	 */
+	if( similarity->interpolate && 
+		strcmp( VIPS_OBJECT_GET_CLASS( similarity->interpolate )->
+			nickname, "bicubic" ) == 0 &&
+		similarity->angle == 0.0 &&
+		similarity->idx == 0.0 &&
+		similarity->idy == 0.0 &&
+		similarity->odx == 0.0 &&
+		similarity->ody == 0.0 ) {
+		if( vips_reduce( resample->in, &t[0], 
+			1.0 / similarity->scale, 
+			1.0 / similarity->scale, NULL ) )  
+			return( -1 );
+	}
+	else {
+		double a = similarity->scale * 
+			cos( VIPS_RAD( similarity->angle ) ); 
+		double b = similarity->scale * 
+			-sin( VIPS_RAD( similarity->angle ) );
+		double c = -b;
+		double d = a;
 
-	if( vips_affine( resample->in, &t[0], a, b, c, d, 
-		"interpolate", similarity->interpolate,
-		"odx", similarity->odx,
-		"ody", similarity->ody,
-		"idx", similarity->idx,
-		"idy", similarity->idy,
-		NULL ) ||
-		vips_image_write( t[0], resample->out ) )
+		if( vips_affine( resample->in, &t[0], a, b, c, d, 
+			"interpolate", similarity->interpolate,
+			"odx", similarity->odx,
+			"ody", similarity->ody,
+			"idx", similarity->idx,
+			"idy", similarity->idy,
+			NULL ) )
+			return( -1 );
+	}
+
+	if( vips_image_write( t[0], resample->out ) )
 		return( -1 ); 
 
 	return( 0 );