working, at least with bug case

working, at least with robclouth test case

see

https://github.com/jcupitt/libvips/issues/326#issuecomment-138888981

ChangeLog

@@ -1,4 +1,4 @@
-7/5/15 started 8.1.0
+7/5/15 starteld 8.1.0
 - add vips_premultiply(), vips_unpremultiply()
 - change the alpha range rules for vips_flatten() to match vips_premultiply()
 - vipsthumbnail uses vips_resize() rather than its own code
@@ -17,6 +17,7 @@
 - can now set any jpeg exif tag, not just modify existing tags
 - add vips_hist_entropy()
 - vips_log(), vips_log10() are zero-avoiding
+- better overlap handling for dzsave, thanks robclouth
 
 7/5/15 started 8.0.3
 - dzsave and tif pyr write could fail for some image dimensions, thanks Jonas

TODO

@@ -1,10 +1,6 @@
-- try:
+- test dzsave deepzoom with new overlap code
 
-	$ vips dzsave k2.jpg x --layout google --overlap 200
-	...
-	extract_area: bad extract area
-
-  bottom tiles are not being clipped?
+- add some more dzsave tests, esp for overlap handling
 
 
 

libvips/foreign/dzsave.c

@@ -53,6 +53,8 @@
  * 	- use a better temp dir name for fs dz output
  * 8/8/15
  * 	- allow zip > 4gb if we have a recent libgsf
+ * 9/9/15
+ * 	- better overlap handling, thanks robclouth 
  */
 
 /*
@@ -112,9 +114,9 @@
 
 /*
 #define DEBUG_VERBOSE
- */
 #define DEBUG
 #define VIPS_DEBUG
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
@@ -969,7 +971,7 @@ strip_allocate( VipsThreadState *state, void *a, gboolean *stop )
 	/* Position this tile.
 	 */
 	state->pos.left = strip->x;
-	state->pos.top = 0;
+	state->pos.top = layer->y;
 	state->pos.width = dz->tile_size;
 	state->pos.height = dz->tile_size;
 
@@ -1202,7 +1204,6 @@ strip_save( Layer *layer )
 		vips_thread_state_new, strip_allocate, strip_work, NULL, 
 		&strip ) ) {
 		strip_free( &strip );
-		printf( "strip_save: error: %s\n", vips_error_buffer() ); 
 		return( -1 );
 	}
 	strip_free( &strip );