lib: add partial image flag

And activate perimeter points removal if this flag is set.

libfprint/fp_internal.h

@@ -376,6 +376,7 @@ struct fp_minutiae {
 #define FP_IMG_H_FLIPPED	(1<<1)
 #define FP_IMG_COLORS_INVERTED	(1<<2)
 #define FP_IMG_BINARIZED_FORM	(1<<3)
+#define FP_IMG_PARTIAL		(1<<4)
 
 #define FP_IMG_STANDARDIZATION_FLAGS (FP_IMG_V_FLIPPED | FP_IMG_H_FLIPPED \
 	| FP_IMG_COLORS_INVERTED)

libfprint/img.c

@@ -283,6 +283,9 @@ int fpi_img_detect_minutiae(struct fp_img *img)
 		return -EINVAL;
 	}
 
+	/* Remove perimeter points from partial image */
+	g_lfsparms_V2.remove_perimeter_pts = img->flags & FP_IMG_PARTIAL ? TRUE : FALSE;
+
 	/* 25.4 mm per inch */
 	timer = g_timer_new();
 	r = get_minutiae(&minutiae, &quality_map, &direction_map,