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Diff of /filter.h [fa87ef] .. [476859] Maximize Restore

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--- a/filter.h
+++ b/filter.h
@@ -915,6 +915,15 @@
 int equisolid_sphere_tp( double x_dest,double  y_dest, double* x_src, double* y_src, void* params);
 int sphere_tp_orthographic( double x_dest,double  y_dest, double* x_src, double* y_src, void* params);
 int orthographic_sphere_tp( double x_dest,double  y_dest, double* x_src, double* y_src, void* params);
+
+int sphere_tp_thoby( double x_dest,double  y_dest, double* x_src, double* y_src, void* params);
+int thoby_sphere_tp( double x_dest,double  y_dest, double* x_src, double* y_src, void* params);
+
+
+
+#define THOBY_K1_PARM 1.47
+#define THOBY_K2_PARM 0.713
+
 
 int rotate_erect		( double x_dest, double y_dest, double* x_src, double* y_src, void* params );
 int inv_radial			( double x_dest, double y_dest, double* x_src, double* y_src, void* params );