add all smartcrop mode

So you can crop to fill as well as crop to fit.

see https://github.com/libvips/libvips/issues/1583

ChangeLog

@@ -15,6 +15,7 @@
 - add subsample_mode, deprecate no_subsample in jpegsave [Elad-Laufer]
 - add vips_isdirf()
 - add PAGENUMBER support to tiff write [jclavoie-jive]
+- add all to smartcrop 
 
 31/1/19 started 8.9.2
 - fix a deadlock with --vips-leak [DarthSim]

libvips/conversion/conversion.c

@@ -214,6 +214,7 @@
  * @VIPS_INTERESTING_ATTENTION: look for features likely to draw human attention
  * @VIPS_INTERESTING_LOW: position the crop towards the low coordinate
  * @VIPS_INTERESTING_HIGH: position the crop towards the high coordinate
+ * @VIPS_INTERESTING_ALL: everything is interesting
  *
  * Pick the algorithm vips uses to decide image "interestingness". This is used
  * by vips_smartcrop(), for example, to decide what parts of the image to

libvips/conversion/smartcrop.c

@@ -12,6 +12,8 @@
  * 	- move shrink to start of processing
  * 22/9/18 jcupitt
  * 	- add low and high
+ * 19/3/20 jcupitt
+ * 	- add all
  */
 
 /*
@@ -345,8 +347,8 @@ vips_smartcrop_build( VipsObject *object )
 		break;
 
 	case VIPS_INTERESTING_CENTRE:
-		left = (smartcrop->in->Xsize - smartcrop->width) / 2;
-		top = (smartcrop->in->Ysize - smartcrop->height) / 2;
+		left = (in->Xsize - smartcrop->width) / 2;
+		top = (in->Ysize - smartcrop->height) / 2;
 		break;
 
 	case VIPS_INTERESTING_ENTROPY:
@@ -360,8 +362,15 @@ vips_smartcrop_build( VipsObject *object )
 		break;
 
 	case VIPS_INTERESTING_HIGH:
-		left = smartcrop->in->Xsize - smartcrop->width;
-		top = smartcrop->in->Ysize - smartcrop->height;
+		left = in->Xsize - smartcrop->width;
+		top = in->Ysize - smartcrop->height;
+		break;
+
+	case VIPS_INTERESTING_ALL:
+		left = 0;
+		top = 0;
+		smartcrop->width = in->Xsize;
+		smartcrop->height = in->Ysize;
 		break;
 
 	default:
@@ -448,10 +457,10 @@ vips_smartcrop_init( VipsSmartcrop *smartcrop )
  * Crop an image down to a specified width and height by removing boring parts. 
  *
  * Use @interesting to pick the method vips uses to decide which bits of the
- * image should be kept. 
+ * image should be kept.
  *
  * You can test xoffset / yoffset on @out to find the location of the crop
- * within the input image. 
+ * within the input image.
  *
  * See also: vips_extract_area().
  * 

libvips/include/vips/conversion.h

@@ -101,6 +101,7 @@ typedef enum {
 	VIPS_INTERESTING_ATTENTION,
 	VIPS_INTERESTING_LOW,
 	VIPS_INTERESTING_HIGH,
+	VIPS_INTERESTING_ALL,
 	VIPS_INTERESTING_LAST
 } VipsInteresting;
 

libvips/iofuncs/enumtypes.c

@@ -366,6 +366,7 @@ vips_interesting_get_type( void )
 			{VIPS_INTERESTING_ATTENTION, "VIPS_INTERESTING_ATTENTION", "attention"},
 			{VIPS_INTERESTING_LOW, "VIPS_INTERESTING_LOW", "low"},
 			{VIPS_INTERESTING_HIGH, "VIPS_INTERESTING_HIGH", "high"},
+			{VIPS_INTERESTING_ALL, "VIPS_INTERESTING_ALL", "all"},
 			{VIPS_INTERESTING_LAST, "VIPS_INTERESTING_LAST", "last"},
 			{0, NULL, NULL}
 		};