add the test_thumbnail script too

test/Makefile.am

@@ -1,8 +1,17 @@
 
 EXTRA_DIST = \
 	images \
-	variables.sh.in
+	variables.sh.in \
+	test_cli.sh \
+	test_formats.sh \
+	test_seq.sh \
+	test_thumbnail.sh \
+	test_threading.sh \
+	test_arithmetic.py \
+	test_colour.py \
+	test_conversion.py 
 
+# don't run test_thumbnail.sh by default, it takes ages
 TESTS = \
 	test_cli.sh \
 	test_formats.sh \
@@ -12,3 +21,7 @@ TESTS = \
 	test_colour.py \
 	test_conversion.py 
 
+clean-local: 
+	-rm -rf tmp
+	-rm -f *.pyc
+

test/test_formats.sh

@@ -40,8 +40,6 @@ save_load() {
 
 # is a difference beyond a threshold? return 0 (meaning all ok) or 1 (meaning
 # error, or outside threshold)
-# 
-# use bc since bash does not support fp math
 break_threshold() {
 	diff=$1
 	threshold=$2
@@ -56,7 +54,7 @@ test_difference() {
 
 	vips subtract $before $after $tmp/difference.v
 	vips abs $tmp/difference.v $tmp/abs.v 
-	dif=`vips max $tmp/abs.v`
+	dif=$(vips max $tmp/abs.v)
 
 	if break_threshold $dif $threshold; then
 		echo "save / load difference is $dif"
@@ -106,9 +104,9 @@ test_raw() {
 	echo -n "testing $(basename $in) raw ... "
 
 	vips copy $in $tmp/before.v
-	width=`vipsheader -f Xsize $tmp/before.v`
-	height=`vipsheader -f Ysize $tmp/before.v`
-	bands=`vipsheader -f Bands $tmp/before.v`
+	width=$(vipsheader -f width $tmp/before.v)
+	height=$(vipsheader -f height $tmp/before.v)
+	bands=$(vipsheader -f bands $tmp/before.v)
 
 	vips rawsave $tmp/before.v $tmp/raw
 	vips rawload $tmp/raw $tmp/after.v $width $height $bands

test/test_threading.sh

@@ -2,14 +2,12 @@
 
 # set -x
 
-source variables.sh 
+. ./variables.sh 
 
 chain=1
 
 # im_benchmark needs a labq
-vips im_sRGB2XYZ $image $tmp/t1.v
-vips im_XYZ2Lab $tmp/t1.v $tmp/t2.v
-vips im_Lab2LabQ $tmp/t2.v $tmp/t3.v
+vips colourspace $image $tmp/t3.v labq
 
 for tile in 10 64 128 512; do
 	# benchmark includes a dither which will vary with tile size
@@ -22,9 +20,9 @@ for tile in 10 64 128 512; do
 		vips --vips-concurrency=$cpus \
 			--vips-tile-width=$tile --vips-tile-height=$tile \
 			im_benchmarkn $tmp/t3.v $tmp/t7.v $chain
-		vips im_subtract $tmp/t5.v $tmp/t7.v $tmp/t8.v
-		vips im_abs $tmp/t8.v $tmp/t9.v
-		max=`vips im_max $tmp/t9.v`
+		vips subtract $tmp/t5.v $tmp/t7.v $tmp/t8.v
+		vips abs $tmp/t8.v $tmp/t9.v
+		max=$(vips max $tmp/t9.v)
 		if [ $max -gt 0 ]; then
 			break
 		fi

test/test_thumbnail.sh

@@ -0,0 +1,60 @@
+#!/bin/sh
+
+# resize a 1000x1000 image to every size in [500,1000] with every interpolator
+# and check for black lines 
+
+# see https://github.com/jcupitt/libvips/issues/131
+
+# set -x
+
+. ./variables.sh
+
+# make a 1000x1000 mono test image
+echo building test image ...
+vips extract_band $image $tmp/t1.v 1
+vips replicate $tmp/t1.v $tmp/t2.v 2 2
+vips extract_area $tmp/t2.v $tmp/t1.v 10 10 1000 1000
+
+# is a difference beyond a threshold? return 0 (meaning all ok) or 1 (meaning
+# error, or outside threshold)
+break_threshold() {
+	diff=$1
+	threshold=$2
+	return $(echo "$diff > $threshold" | bc -l)
+}
+
+for interp in nearest bilinear bicubic lbb nohalo vsqbs; do
+  size=1000
+  while [ $size -gt 499 ]; do
+    echo -n "testing $interp, size to $size ... "
+    vipsthumbnail $tmp/t1.v -o $tmp/t2.v --size $size --interpolator $interp
+    if [ $(vipsheader -f width $tmp/t2.v) -ne $size ]; then
+      echo failed -- bad size
+      exit
+    fi
+    if [ $(vipsheader -f height $tmp/t2.v) -ne $size ]; then
+      echo failed -- bad size
+      exit
+    fi
+    vips project $tmp/t2.v $tmp/cols.v $tmp/rows.v
+
+    min=$(vips min $tmp/cols.v)
+    if break_threshold $min 0; then
+      echo failed -- has a black column
+      exit
+    fi
+        
+    min=$(vips min $tmp/rows.v)
+    if break_threshold $min 0; then
+      echo failed -- has a black row
+      exit
+    fi
+
+    echo ok
+
+    size=$(($size-1))       
+  done
+done
+        
+
+