Update gmt_macros.h

src/gmt_macros.h

@@ -201,6 +201,13 @@
 /*! Get a color component from a n*4 column-oriented colormap */
 #define gmt_M_get_rgba(map,index,color,n) map[index + (color)*(n)]
 
+/*! Copy a 4-element rgb in 0-255 range to normalized 0-1 range */
+#define gmt_M_cp_rgb_normalize(rgb_normalized, rgb_integer) {for (unsigned int c = 0; c < 4; c++) rgb_normalized[c] = gmt_M_is255(rgb_integer[c]); }
+/*! Macros to do conversion to inches with PROJ_LENGTH_UNIT as default */
+
+/*! Copy a 4-element rgb in normalized 0-1 range to integer 0-255 range */
+#define gmt_M_cp_rgb_integer(rgb_integer, rgb_normalized) {for (unsigned int c = 0; c < 4; c++) rgb_integer[c] = gmt_M_s255(rgb_normalized[c]); }
+
 /*! Set a color component in a n*4 column-oriented colormap */
 #define gmt_M_set_rgba(map,index,color,n,value) map[index + (color)*(n)] = (value)