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use -1 for do-nothing

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so that users can have skip-only-exact-blanks

see https://github.com/libvips/libvips/issues/1185#issuecomment-449115143
This commit is contained in:
John Cupitt 2018-12-21 14:08:54 +00:00
parent d1989e4c94
commit 74ee68fd79
1 changed files with 12 additions and 11 deletions
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23
libvips/foreign/dzsave.c
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@ -1169,7 +1169,7 @@ strip_work( VipsThreadState *state, void *a )
state->pos.width, state->pos.height, NULL ) )
return( -1 );
if( dz->skip_blanks > 0 &&
if( dz->skip_blanks >= 0 &&
tile_equal( x, dz->skip_blanks, dz->ink ) ) {
g_object_unref( x );
@ -1697,7 +1697,7 @@ vips_foreign_save_dz_build( VipsObject *object )
/* We use ink to check for blank tiles.
*/
if( dz->skip_blanks > 0 ) {
if( dz->skip_blanks >= 0 ) {
if( !(dz->ink = vips__vector_to_ink(
class->nickname, save->ready,
VIPS_AREA( save->background )->data, NULL,
@ -2115,7 +2115,7 @@ vips_foreign_save_dz_class_init( VipsForeignSaveDzClass *class )
_( "Skip tiles which are nearly equal to the background" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveDz, skip_blanks ),
0, 65535, 5 );
-1, 65535, 5 );
/* How annoying. We stupidly had these in earlier versions.
*/
@ -2156,6 +2156,7 @@ vips_foreign_save_dz_init( VipsForeignSaveDz *dz )
dz->container = VIPS_FOREIGN_DZ_CONTAINER_FS;
dz->compression = 0;
dz->region_shrink = VIPS_REGION_SHRINK_MEAN;
dz->skip_blanks = -1;
}
typedef struct _VipsForeignSaveDzFile {
@ -2352,8 +2353,8 @@ vips_foreign_save_dz_buffer_init( VipsForeignSaveDzBuffer *buffer )
* * @container: #VipsForeignDzContainer set container type
* * @properties: %gboolean write a properties file
* * @compression: %gint zip deflate compression level
* * @region_shrink: #VipsRegionShrink How to shrink each 2x2 region
* * @skip_blanks: %gint Skip tiles which are nearly equal to the background
* * @region_shrink: #VipsRegionShrink how to shrink each 2x2 region
* * @skip_blanks: %gint skip tiles which are nearly equal to the background
*
* Save an image as a set of tiles at various resolutions. By default dzsave
* uses DeepZoom layout -- use @layout to pick other conventions.
@ -2401,10 +2402,10 @@ vips_foreign_save_dz_buffer_init( VipsForeignSaveDzBuffer *buffer )
* region. This defaults to using the average of the 4 input pixels but you can
* also use the median in cases where you want to preserve the range of values.
*
* If you set @skip_blanks to a value greater than zero, tiles which are
* all within that many pixel values to the background are skipped. This can
* save a lot of space for some image types. This option defaults to 5 in
* Google layout mode, 0 otherwise.
* If you set @skip_blanks to a value greater than or equal to zero, tiles
* which are all within that many pixel values to the background are skipped.
* This can save a lot of space for some image types. This option defaults to
* 5 in Google layout mode, -1 otherwise.
*
* See also: vips_tiffsave().
*
@ -2444,8 +2445,8 @@ vips_dzsave( VipsImage *in, const char *name, ... )
* * @container: #VipsForeignDzContainer set container type
* * @properties: %gboolean write a properties file
* * @compression: %gint zip deflate compression level
* * @region_shrink: #VipsRegionShrink How to shrink each 2x2 region.
* * @skip_blanks: %gint Skip tiles which are nearly equal to the background
* * @region_shrink: #VipsRegionShrink how to shrink each 2x2 region.
* * @skip_blanks: %gint skip tiles which are nearly equal to the background
*
* As vips_dzsave(), but save to a memory buffer.
*